* [RFC PATCH v1 19/41] powerpc/32: Move exception prolog code into .text once MMU is back on
From: Christophe Leroy @ 2021-02-09 9:56 UTC (permalink / raw)
To: Benjamin Herrenschmidt, Paul Mackerras, Michael Ellerman, npiggin
Cc: linuxppc-dev, linux-kernel
In-Reply-To: <cover.1612864003.git.christophe.leroy@csgroup.eu>
The space in the head section is rather constrained by the fact that
exception vectors are spread every 0x100 bytes and sometimes we
need to have "out of line" code because it doesn't fit.
Now that we are enabling MMU early in the prolog, take that opportunity
to jump somewhere else in the .text section where we don't have any
space constraint.
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
---
arch/powerpc/kernel/head_32.h | 5 ++++
arch/powerpc/kernel/head_40x.S | 6 +++++
arch/powerpc/kernel/head_8xx.S | 25 ++++++++------------
arch/powerpc/kernel/head_book3s_32.S | 34 ++++++++++++----------------
4 files changed, 36 insertions(+), 34 deletions(-)
diff --git a/arch/powerpc/kernel/head_32.h b/arch/powerpc/kernel/head_32.h
index d97ec94b34da..3c0aa4538514 100644
--- a/arch/powerpc/kernel/head_32.h
+++ b/arch/powerpc/kernel/head_32.h
@@ -70,6 +70,8 @@
mtspr SPRN_SRR0, r11
mfspr r11, SPRN_SPRG_SCRATCH2
rfi
+
+ .text
1:
stw r11,GPR1(r1)
stw r11,0(r1)
@@ -163,12 +165,14 @@
*/
#ifdef CONFIG_PPC_BOOK3S
#define START_EXCEPTION(n, label) \
+ __HEAD; \
. = n; \
DO_KVM n; \
label:
#else
#define START_EXCEPTION(n, label) \
+ __HEAD; \
. = n; \
label:
@@ -196,6 +200,7 @@
ret_from_except)
.macro vmap_stack_overflow_exception
+ __HEAD
vmap_stack_overflow:
#ifdef CONFIG_SMP
mfspr r1, SPRN_SPRG_THREAD
diff --git a/arch/powerpc/kernel/head_40x.S b/arch/powerpc/kernel/head_40x.S
index c14a71e0d6d3..e7d8856714d3 100644
--- a/arch/powerpc/kernel/head_40x.S
+++ b/arch/powerpc/kernel/head_40x.S
@@ -132,6 +132,8 @@ _ENTRY(crit_esr)
ori r11, r11, 1f@l
mtspr SPRN_SRR0, r11
rfi
+
+ .text
1:
lwz r11,crit_r1@l(0)
stw r11,GPR1(r1)
@@ -496,6 +498,7 @@ _ENTRY(crit_esr)
crit_transfer_to_handler, ret_from_crit_exc)
/* Programmable Interval Timer (PIT) Exception. (from 0x1000) */
+ __HEAD
Decrementer:
EXCEPTION_PROLOG
lis r0,TSR_PIS@h
@@ -504,12 +507,14 @@ Decrementer:
EXC_XFER_LITE(0x1000, timer_interrupt)
/* Fixed Interval Timer (FIT) Exception. (from 0x1010) */
+ __HEAD
FITException:
EXCEPTION_PROLOG
addi r3,r1,STACK_FRAME_OVERHEAD;
EXC_XFER_STD(0x1010, unknown_exception)
/* Watchdog Timer (WDT) Exception. (from 0x1020) */
+ __HEAD
WDTException:
CRITICAL_EXCEPTION_PROLOG;
addi r3,r1,STACK_FRAME_OVERHEAD;
@@ -523,6 +528,7 @@ WDTException:
* reserved.
*/
+ __HEAD
/* Damn, I came up one instruction too many to fit into the
* exception space :-). Both the instruction and data TLB
* miss get to this point to load the TLB.
diff --git a/arch/powerpc/kernel/head_8xx.S b/arch/powerpc/kernel/head_8xx.S
index 11789a077d76..d16d0ec71bb2 100644
--- a/arch/powerpc/kernel/head_8xx.S
+++ b/arch/powerpc/kernel/head_8xx.S
@@ -133,7 +133,7 @@ instruction_counter:
START_EXCEPTION(0x600, Alignment)
EXCEPTION_PROLOG handle_dar_dsisr=1
addi r3,r1,STACK_FRAME_OVERHEAD
- b .Lalignment_exception_ool
+ EXC_XFER_STD(0x600, alignment_exception)
/* Program check exception */
EXCEPTION(0x700, ProgramCheck, program_check_exception, EXC_XFER_STD)
@@ -141,11 +141,6 @@ instruction_counter:
/* Decrementer */
EXCEPTION(0x900, Decrementer, timer_interrupt, EXC_XFER_LITE)
- /* With VMAP_STACK there's not enough room for this at 0x600 */
- . = 0xa00
-.Lalignment_exception_ool:
- EXC_XFER_STD(0x600, alignment_exception)
-
/* System call */
START_EXCEPTION(0xc00, SystemCall)
SYSCALL_ENTRY 0xc00
@@ -339,26 +334,25 @@ DARFixed:/* Return from dcbx instruction bug workaround */
* support of breakpoints and such. Someday I will get around to
* using them.
*/
-do_databreakpoint:
- EXCEPTION_PROLOG_1
- EXCEPTION_PROLOG_2 handle_dar_dsisr=1
- addi r3,r1,STACK_FRAME_OVERHEAD
- mfspr r4,SPRN_BAR
- stw r4,_DAR(r11)
- EXC_XFER_STD(0x1c00, do_break)
-
START_EXCEPTION(0x1c00, DataBreakpoint)
EXCEPTION_PROLOG_0 handle_dar_dsisr=1
mfspr r11, SPRN_SRR0
cmplwi cr1, r11, (.Ldtlbie - PAGE_OFFSET)@l
cmplwi cr7, r11, (.Litlbie - PAGE_OFFSET)@l
cror 4*cr1+eq, 4*cr1+eq, 4*cr7+eq
- bne cr1, do_databreakpoint
+ bne cr1, 1f
mtcr r10
mfspr r10, SPRN_SPRG_SCRATCH0
mfspr r11, SPRN_SPRG_SCRATCH1
rfi
+1: EXCEPTION_PROLOG_1
+ EXCEPTION_PROLOG_2 handle_dar_dsisr=1
+ addi r3,r1,STACK_FRAME_OVERHEAD
+ mfspr r4,SPRN_BAR
+ stw r4,_DAR(r11)
+ EXC_XFER_STD(0x1c00, do_break)
+
#ifdef CONFIG_PERF_EVENTS
START_EXCEPTION(0x1d00, InstructionBreakpoint)
mtspr SPRN_SPRG_SCRATCH0, r10
@@ -376,6 +370,7 @@ do_databreakpoint:
EXCEPTION(0x1e00, Trap_1e, unknown_exception, EXC_XFER_STD)
EXCEPTION(0x1f00, Trap_1f, unknown_exception, EXC_XFER_STD)
+ __HEAD
. = 0x2000
/* This is the procedure to calculate the data EA for buggy dcbx,dcbi instructions
diff --git a/arch/powerpc/kernel/head_book3s_32.S b/arch/powerpc/kernel/head_book3s_32.S
index 8f5c8c8da63d..56d7bc212866 100644
--- a/arch/powerpc/kernel/head_book3s_32.S
+++ b/arch/powerpc/kernel/head_book3s_32.S
@@ -269,11 +269,10 @@ __secondary_hold_acknowledge:
7: EXCEPTION_PROLOG_2
addi r3,r1,STACK_FRAME_OVERHEAD
#ifdef CONFIG_PPC_CHRP
- beq cr1, machine_check_tramp
+ beq cr1, 1f
twi 31, 0, 0
-#else
- b machine_check_tramp
#endif
+1: EXC_XFER_STD(0x200, machine_check_exception)
/* Data access exception. */
START_EXCEPTION(0x300, DataAccess)
@@ -297,7 +296,13 @@ ALT_MMU_FTR_SECTION_END_IFSET(MMU_FTR_HPTE_TABLE)
#endif
1: EXCEPTION_PROLOG_0 handle_dar_dsisr=1
EXCEPTION_PROLOG_1
- b handle_page_fault_tramp_1
+ EXCEPTION_PROLOG_2 handle_dar_dsisr=1
+ lwz r5, _DSISR(r11)
+ andis. r0, r5, DSISR_DABRMATCH@h
+ bne- 1f
+ EXC_XFER_LITE(0x300, handle_page_fault)
+1: EXC_XFER_STD(0x300, do_break)
+
/* Instruction access exception. */
START_EXCEPTION(0x400, InstructionAccess)
@@ -333,7 +338,7 @@ END_MMU_FTR_SECTION_IFSET(MMU_FTR_HPTE_TABLE)
START_EXCEPTION(0x600, Alignment)
EXCEPTION_PROLOG handle_dar_dsisr=1
addi r3,r1,STACK_FRAME_OVERHEAD
- b alignment_exception_tramp
+ EXC_XFER_STD(0x600, alignment_exception)
/* Program check exception */
EXCEPTION(0x700, ProgramCheck, program_check_exception, EXC_XFER_STD)
@@ -385,6 +390,7 @@ END_FTR_SECTION_IFSET(CPU_FTR_FPU_UNAVAILABLE)
START_EXCEPTION(0xf20, AltiVecUnavailableTrap)
b AltiVecUnavailable
+ __HEAD
/*
* Handle TLB miss for instruction on 603/603e.
* Note: we get an alternate set of r0 - r3 to use automatically.
@@ -624,22 +630,9 @@ END_MMU_FTR_SECTION_IFSET(MMU_FTR_NEED_DTLB_SW_LRU)
EXCEPTION(0x2e00, Trap_2e, unknown_exception, EXC_XFER_STD)
EXCEPTION(0x2f00, Trap_2f, unknown_exception, EXC_XFER_STD)
+ __HEAD
. = 0x3000
-machine_check_tramp:
- EXC_XFER_STD(0x200, machine_check_exception)
-
-alignment_exception_tramp:
- EXC_XFER_STD(0x600, alignment_exception)
-
-handle_page_fault_tramp_1:
- EXCEPTION_PROLOG_2 handle_dar_dsisr=1
- lwz r5, _DSISR(r11)
- andis. r0, r5, DSISR_DABRMATCH@h
- bne- 1f
- EXC_XFER_LITE(0x300, handle_page_fault)
-1: EXC_XFER_STD(0x300, do_break)
-
#ifdef CONFIG_PPC_BOOK3S_604
.macro save_regs_thread thread
stw r0, THR0(\thread)
@@ -718,6 +711,7 @@ fast_hash_page_return:
vmap_stack_overflow_exception
#endif
+ __HEAD
AltiVecUnavailable:
EXCEPTION_PROLOG
#ifdef CONFIG_ALTIVEC
@@ -728,12 +722,14 @@ AltiVecUnavailable:
1: addi r3,r1,STACK_FRAME_OVERHEAD
EXC_XFER_LITE(0xf20, altivec_unavailable_exception)
+ __HEAD
PerformanceMonitor:
EXCEPTION_PROLOG
addi r3,r1,STACK_FRAME_OVERHEAD
EXC_XFER_STD(0xf00, performance_monitor_exception)
+ __HEAD
/*
* This code is jumped to from the startup code to copy
* the kernel image to physical address PHYSICAL_START.
--
2.25.0
^ permalink raw reply related
* [RFC PATCH v1 20/41] powerpc/32: Provide a name to exception prolog continuation in virtual mode
From: Christophe Leroy @ 2021-02-09 9:56 UTC (permalink / raw)
To: Benjamin Herrenschmidt, Paul Mackerras, Michael Ellerman, npiggin
Cc: linuxppc-dev, linux-kernel
In-Reply-To: <cover.1612864003.git.christophe.leroy@csgroup.eu>
Now that the prolog continuation is separated in .text, give it a name
and mark it _ASM_NOKPROBE_SYMBOL.
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
---
arch/powerpc/kernel/head_32.h | 12 +++++++-----
arch/powerpc/kernel/head_40x.S | 22 ++++++++++++----------
arch/powerpc/kernel/head_8xx.S | 10 +++++-----
arch/powerpc/kernel/head_book3s_32.S | 14 +++++++-------
4 files changed, 31 insertions(+), 27 deletions(-)
diff --git a/arch/powerpc/kernel/head_32.h b/arch/powerpc/kernel/head_32.h
index 3c0aa4538514..160ebd573c37 100644
--- a/arch/powerpc/kernel/head_32.h
+++ b/arch/powerpc/kernel/head_32.h
@@ -10,10 +10,10 @@
* We assume sprg3 has the physical address of the current
* task's thread_struct.
*/
-.macro EXCEPTION_PROLOG handle_dar_dsisr=0
+.macro EXCEPTION_PROLOG name handle_dar_dsisr=0
EXCEPTION_PROLOG_0 handle_dar_dsisr=\handle_dar_dsisr
EXCEPTION_PROLOG_1
- EXCEPTION_PROLOG_2 handle_dar_dsisr=\handle_dar_dsisr
+ EXCEPTION_PROLOG_2 \name handle_dar_dsisr=\handle_dar_dsisr
.endm
.macro EXCEPTION_PROLOG_0 handle_dar_dsisr=0
@@ -56,7 +56,7 @@
#endif
.endm
-.macro EXCEPTION_PROLOG_2 handle_dar_dsisr=0
+.macro EXCEPTION_PROLOG_2 name handle_dar_dsisr=0
#ifdef CONFIG_PPC_8xx
.if \handle_dar_dsisr
li r11, RPN_PATTERN
@@ -72,6 +72,7 @@
rfi
.text
+\name\()_virt:
1:
stw r11,GPR1(r1)
stw r11,0(r1)
@@ -109,6 +110,7 @@
stw r10,8(r11)
SAVE_4GPRS(3, r11)
SAVE_2GPRS(7, r11)
+_ASM_NOKPROBE_SYMBOL(\name\()_virt)
.endm
.macro SYSCALL_ENTRY trapno
@@ -180,7 +182,7 @@
#define EXCEPTION(n, label, hdlr, xfer) \
START_EXCEPTION(n, label) \
- EXCEPTION_PROLOG; \
+ EXCEPTION_PROLOG label; \
addi r3,r1,STACK_FRAME_OVERHEAD; \
xfer(n, hdlr)
@@ -212,7 +214,7 @@
#endif
lwz r1, emergency_ctx@l(r1)
addi r1, r1, THREAD_SIZE - INT_FRAME_SIZE
- EXCEPTION_PROLOG_2
+ EXCEPTION_PROLOG_2 vmap_stack_overflow
SAVE_NVGPRS(r11)
addi r3, r1, STACK_FRAME_OVERHEAD
EXC_XFER_STD(0, stack_overflow_exception)
diff --git a/arch/powerpc/kernel/head_40x.S b/arch/powerpc/kernel/head_40x.S
index e7d8856714d3..86883ccb3dc5 100644
--- a/arch/powerpc/kernel/head_40x.S
+++ b/arch/powerpc/kernel/head_40x.S
@@ -104,7 +104,7 @@ _ENTRY(crit_esr)
* Instead we use a couple of words of memory at low physical addresses.
* This is OK since we don't support SMP on these processors.
*/
-.macro CRITICAL_EXCEPTION_PROLOG
+.macro CRITICAL_EXCEPTION_PROLOG name
stw r10,crit_r10@l(0) /* save two registers to work with */
stw r11,crit_r11@l(0)
mfspr r10,SPRN_SRR0
@@ -135,6 +135,7 @@ _ENTRY(crit_esr)
.text
1:
+\name\()_virt:
lwz r11,crit_r1@l(0)
stw r11,GPR1(r1)
stw r11,0(r1)
@@ -162,6 +163,7 @@ _ENTRY(crit_esr)
stw r10, 8(r11)
SAVE_4GPRS(3, r11)
SAVE_2GPRS(7, r11)
+_ASM_NOKPROBE_SYMBOL(\name\()_virt)
.endm
/*
@@ -182,7 +184,7 @@ _ENTRY(crit_esr)
*/
#define CRITICAL_EXCEPTION(n, label, hdlr) \
START_EXCEPTION(n, label); \
- CRITICAL_EXCEPTION_PROLOG; \
+ CRITICAL_EXCEPTION_PROLOG label; \
addi r3,r1,STACK_FRAME_OVERHEAD; \
EXC_XFER_TEMPLATE(hdlr, n+2, (MSR_KERNEL & ~(MSR_ME|MSR_DE|MSR_CE)), \
crit_transfer_to_handler, ret_from_crit_exc)
@@ -205,7 +207,7 @@ _ENTRY(crit_esr)
* if they can't resolve the lightweight TLB fault.
*/
START_EXCEPTION(0x0300, DataStorage)
- EXCEPTION_PROLOG handle_dar_dsisr=1
+ EXCEPTION_PROLOG DataStorage handle_dar_dsisr=1
EXC_XFER_LITE(0x300, handle_page_fault)
/*
@@ -213,7 +215,7 @@ _ENTRY(crit_esr)
* This is caused by a fetch from non-execute or guarded pages.
*/
START_EXCEPTION(0x0400, InstructionAccess)
- EXCEPTION_PROLOG
+ EXCEPTION_PROLOG InstructionAccess
li r5,0
stw r5, _ESR(r11) /* Zero ESR */
stw r12, _DEAR(r11) /* SRR0 as DEAR */
@@ -224,13 +226,13 @@ _ENTRY(crit_esr)
/* 0x0600 - Alignment Exception */
START_EXCEPTION(0x0600, Alignment)
- EXCEPTION_PROLOG handle_dar_dsisr=1
+ EXCEPTION_PROLOG Alignment handle_dar_dsisr=1
addi r3,r1,STACK_FRAME_OVERHEAD
EXC_XFER_STD(0x600, alignment_exception)
/* 0x0700 - Program Exception */
START_EXCEPTION(0x0700, ProgramCheck)
- EXCEPTION_PROLOG handle_dar_dsisr=1
+ EXCEPTION_PROLOG ProgramCheck handle_dar_dsisr=1
addi r3,r1,STACK_FRAME_OVERHEAD
EXC_XFER_STD(0x700, program_check_exception)
@@ -450,7 +452,7 @@ _ENTRY(crit_esr)
*/
/* 0x2000 - Debug Exception */
START_EXCEPTION(0x2000, DebugTrap)
- CRITICAL_EXCEPTION_PROLOG
+ CRITICAL_EXCEPTION_PROLOG DebugTrap
/*
* If this is a single step or branch-taken exception in an
@@ -500,7 +502,7 @@ _ENTRY(crit_esr)
/* Programmable Interval Timer (PIT) Exception. (from 0x1000) */
__HEAD
Decrementer:
- EXCEPTION_PROLOG
+ EXCEPTION_PROLOG Decrementer
lis r0,TSR_PIS@h
mtspr SPRN_TSR,r0 /* Clear the PIT exception */
addi r3,r1,STACK_FRAME_OVERHEAD
@@ -509,14 +511,14 @@ Decrementer:
/* Fixed Interval Timer (FIT) Exception. (from 0x1010) */
__HEAD
FITException:
- EXCEPTION_PROLOG
+ EXCEPTION_PROLOG FITException
addi r3,r1,STACK_FRAME_OVERHEAD;
EXC_XFER_STD(0x1010, unknown_exception)
/* Watchdog Timer (WDT) Exception. (from 0x1020) */
__HEAD
WDTException:
- CRITICAL_EXCEPTION_PROLOG;
+ CRITICAL_EXCEPTION_PROLOG WDTException
addi r3,r1,STACK_FRAME_OVERHEAD;
EXC_XFER_TEMPLATE(WatchdogException, 0x1020+2,
(MSR_KERNEL & ~(MSR_ME|MSR_DE|MSR_CE)),
diff --git a/arch/powerpc/kernel/head_8xx.S b/arch/powerpc/kernel/head_8xx.S
index d16d0ec71bb2..932702a38234 100644
--- a/arch/powerpc/kernel/head_8xx.S
+++ b/arch/powerpc/kernel/head_8xx.S
@@ -122,7 +122,7 @@ instruction_counter:
/* Machine check */
START_EXCEPTION(0x200, MachineCheck)
- EXCEPTION_PROLOG handle_dar_dsisr=1
+ EXCEPTION_PROLOG MachineCheck handle_dar_dsisr=1
addi r3,r1,STACK_FRAME_OVERHEAD
EXC_XFER_STD(0x200, machine_check_exception)
@@ -131,7 +131,7 @@ instruction_counter:
/* Alignment exception */
START_EXCEPTION(0x600, Alignment)
- EXCEPTION_PROLOG handle_dar_dsisr=1
+ EXCEPTION_PROLOG Alignment handle_dar_dsisr=1
addi r3,r1,STACK_FRAME_OVERHEAD
EXC_XFER_STD(0x600, alignment_exception)
@@ -294,7 +294,7 @@ instruction_counter:
* addresses. There is nothing to do but handle a big time error fault.
*/
START_EXCEPTION(0x1300, InstructionTLBError)
- EXCEPTION_PROLOG
+ EXCEPTION_PROLOG InstructionTLBError
andis. r5,r9,DSISR_SRR1_MATCH_32S@h /* Filter relevant SRR1 bits */
andis. r10,r9,SRR1_ISI_NOPT@h
beq+ .Litlbie
@@ -316,7 +316,7 @@ instruction_counter:
beq- cr1, FixupDAR /* must be a buggy dcbX, icbi insn. */
DARFixed:/* Return from dcbx instruction bug workaround */
EXCEPTION_PROLOG_1
- EXCEPTION_PROLOG_2 handle_dar_dsisr=1
+ EXCEPTION_PROLOG_2 DataTLBError handle_dar_dsisr=1
lwz r4, _DAR(r11)
lwz r5, _DSISR(r11)
andis. r10,r5,DSISR_NOHPTE@h
@@ -347,7 +347,7 @@ DARFixed:/* Return from dcbx instruction bug workaround */
rfi
1: EXCEPTION_PROLOG_1
- EXCEPTION_PROLOG_2 handle_dar_dsisr=1
+ EXCEPTION_PROLOG_2 DataBreakpoint handle_dar_dsisr=1
addi r3,r1,STACK_FRAME_OVERHEAD
mfspr r4,SPRN_BAR
stw r4,_DAR(r11)
diff --git a/arch/powerpc/kernel/head_book3s_32.S b/arch/powerpc/kernel/head_book3s_32.S
index 56d7bc212866..24cb245e1c5b 100644
--- a/arch/powerpc/kernel/head_book3s_32.S
+++ b/arch/powerpc/kernel/head_book3s_32.S
@@ -266,7 +266,7 @@ __secondary_hold_acknowledge:
mfspr r1, SPRN_SPRG_SCRATCH2
#endif /* CONFIG_PPC_CHRP */
EXCEPTION_PROLOG_1
-7: EXCEPTION_PROLOG_2
+7: EXCEPTION_PROLOG_2 MachineCheck
addi r3,r1,STACK_FRAME_OVERHEAD
#ifdef CONFIG_PPC_CHRP
beq cr1, 1f
@@ -296,7 +296,7 @@ ALT_MMU_FTR_SECTION_END_IFSET(MMU_FTR_HPTE_TABLE)
#endif
1: EXCEPTION_PROLOG_0 handle_dar_dsisr=1
EXCEPTION_PROLOG_1
- EXCEPTION_PROLOG_2 handle_dar_dsisr=1
+ EXCEPTION_PROLOG_2 DataAccess handle_dar_dsisr=1
lwz r5, _DSISR(r11)
andis. r0, r5, DSISR_DABRMATCH@h
bne- 1f
@@ -325,7 +325,7 @@ END_MMU_FTR_SECTION_IFSET(MMU_FTR_HPTE_TABLE)
andi. r11, r11, MSR_PR
EXCEPTION_PROLOG_1
- EXCEPTION_PROLOG_2
+ EXCEPTION_PROLOG_2 InstructionAccess
andis. r5,r9,DSISR_SRR1_MATCH_32S@h /* Filter relevant SRR1 bits */
stw r5, _DSISR(r11)
stw r12, _DAR(r11)
@@ -336,7 +336,7 @@ END_MMU_FTR_SECTION_IFSET(MMU_FTR_HPTE_TABLE)
/* Alignment exception */
START_EXCEPTION(0x600, Alignment)
- EXCEPTION_PROLOG handle_dar_dsisr=1
+ EXCEPTION_PROLOG Alignment handle_dar_dsisr=1
addi r3,r1,STACK_FRAME_OVERHEAD
EXC_XFER_STD(0x600, alignment_exception)
@@ -353,7 +353,7 @@ BEGIN_FTR_SECTION
*/
b ProgramCheck
END_FTR_SECTION_IFSET(CPU_FTR_FPU_UNAVAILABLE)
- EXCEPTION_PROLOG
+ EXCEPTION_PROLOG FPUnavailable
beq 1f
bl load_up_fpu /* if from user, just load it up */
b fast_exception_return
@@ -713,7 +713,7 @@ fast_hash_page_return:
__HEAD
AltiVecUnavailable:
- EXCEPTION_PROLOG
+ EXCEPTION_PROLOG AltiVecUnavailable
#ifdef CONFIG_ALTIVEC
beq 1f
bl load_up_altivec /* if from user, just load it up */
@@ -724,7 +724,7 @@ AltiVecUnavailable:
__HEAD
PerformanceMonitor:
- EXCEPTION_PROLOG
+ EXCEPTION_PROLOG PerformanceMonitor
addi r3,r1,STACK_FRAME_OVERHEAD
EXC_XFER_STD(0xf00, performance_monitor_exception)
--
2.25.0
^ permalink raw reply related
* [RFC PATCH v1 21/41] powerpc/32: Refactor booke critical registers saving
From: Christophe Leroy @ 2021-02-09 9:56 UTC (permalink / raw)
To: Benjamin Herrenschmidt, Paul Mackerras, Michael Ellerman, npiggin
Cc: linuxppc-dev, linux-kernel
In-Reply-To: <cover.1612864003.git.christophe.leroy@csgroup.eu>
Refactor booke critical registers saving into a few macros
and move it into the exception prolog directly.
Keep the dedicated transfert_to_handler entry point for the
moment allthough they are empty. They will be removed in a
later patch to reduce churn.
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
---
arch/powerpc/kernel/entry_32.S | 33 -------------------------
arch/powerpc/kernel/head_booke.h | 41 ++++++++++++++++++++++++++++++++
2 files changed, 41 insertions(+), 33 deletions(-)
diff --git a/arch/powerpc/kernel/entry_32.S b/arch/powerpc/kernel/entry_32.S
index f244e7846031..dce0f03a0e88 100644
--- a/arch/powerpc/kernel/entry_32.S
+++ b/arch/powerpc/kernel/entry_32.S
@@ -51,49 +51,16 @@
#ifdef CONFIG_BOOKE
.globl mcheck_transfer_to_handler
mcheck_transfer_to_handler:
- mfspr r0,SPRN_DSRR0
- stw r0,_DSRR0(r11)
- mfspr r0,SPRN_DSRR1
- stw r0,_DSRR1(r11)
/* fall through */
_ASM_NOKPROBE_SYMBOL(mcheck_transfer_to_handler)
.globl debug_transfer_to_handler
debug_transfer_to_handler:
- mfspr r0,SPRN_CSRR0
- stw r0,_CSRR0(r11)
- mfspr r0,SPRN_CSRR1
- stw r0,_CSRR1(r11)
/* fall through */
_ASM_NOKPROBE_SYMBOL(debug_transfer_to_handler)
.globl crit_transfer_to_handler
crit_transfer_to_handler:
-#ifdef CONFIG_PPC_BOOK3E_MMU
- mfspr r0,SPRN_MAS0
- stw r0,MAS0(r11)
- mfspr r0,SPRN_MAS1
- stw r0,MAS1(r11)
- mfspr r0,SPRN_MAS2
- stw r0,MAS2(r11)
- mfspr r0,SPRN_MAS3
- stw r0,MAS3(r11)
- mfspr r0,SPRN_MAS6
- stw r0,MAS6(r11)
-#ifdef CONFIG_PHYS_64BIT
- mfspr r0,SPRN_MAS7
- stw r0,MAS7(r11)
-#endif /* CONFIG_PHYS_64BIT */
-#endif /* CONFIG_PPC_BOOK3E_MMU */
-#ifdef CONFIG_44x
- mfspr r0,SPRN_MMUCR
- stw r0,MMUCR(r11)
-#endif
- mfspr r0,SPRN_SRR0
- stw r0,_SRR0(r11)
- mfspr r0,SPRN_SRR1
- stw r0,_SRR1(r11)
-
/* fall through */
_ASM_NOKPROBE_SYMBOL(crit_transfer_to_handler)
#endif
diff --git a/arch/powerpc/kernel/head_booke.h b/arch/powerpc/kernel/head_booke.h
index ff93ed519b3b..a57a312c7f86 100644
--- a/arch/powerpc/kernel/head_booke.h
+++ b/arch/powerpc/kernel/head_booke.h
@@ -229,6 +229,36 @@ ALT_FTR_SECTION_END_IFSET(CPU_FTR_EMB_HV)
SAVE_4GPRS(3, r11); \
SAVE_2GPRS(7, r11)
+.macro SAVE_xSRR xSRR
+ mfspr r0,SPRN_\xSRR\()0
+ stw r0,_\xSRR\()0(r1)
+ mfspr r0,SPRN_\xSRR\()1
+ stw r0,_\xSRR\()1(r1)
+.endm
+
+.macro SAVE_MMU_REGS
+#ifdef CONFIG_PPC_BOOK3E_MMU
+ mfspr r0,SPRN_MAS0
+ stw r0,MAS0(r1)
+ mfspr r0,SPRN_MAS1
+ stw r0,MAS1(r1)
+ mfspr r0,SPRN_MAS2
+ stw r0,MAS2(r1)
+ mfspr r0,SPRN_MAS3
+ stw r0,MAS3(r1)
+ mfspr r0,SPRN_MAS6
+ stw r0,MAS6(r1)
+#ifdef CONFIG_PHYS_64BIT
+ mfspr r0,SPRN_MAS7
+ stw r0,MAS7(r1)
+#endif /* CONFIG_PHYS_64BIT */
+#endif /* CONFIG_PPC_BOOK3E_MMU */
+#ifdef CONFIG_44x
+ mfspr r0,SPRN_MMUCR
+ stw r0,MMUCR(r1)
+#endif
+.endm
+
#define CRITICAL_EXCEPTION_PROLOG(intno) \
EXC_LEVEL_EXCEPTION_PROLOG(CRIT, intno, SPRN_CSRR0, SPRN_CSRR1)
#define DEBUG_EXCEPTION_PROLOG \
@@ -271,6 +301,8 @@ ALT_FTR_SECTION_END_IFSET(CPU_FTR_EMB_HV)
START_EXCEPTION(label); \
CRITICAL_EXCEPTION_PROLOG(intno); \
addi r3,r1,STACK_FRAME_OVERHEAD; \
+ SAVE_MMU_REGS; \
+ SAVE_xSRR SRR; \
EXC_XFER_TEMPLATE(hdlr, n+2, (MSR_KERNEL & ~(MSR_ME|MSR_DE|MSR_CE)), \
crit_transfer_to_handler, ret_from_crit_exc)
@@ -280,6 +312,10 @@ ALT_FTR_SECTION_END_IFSET(CPU_FTR_EMB_HV)
mfspr r5,SPRN_ESR; \
stw r5,_ESR(r11); \
addi r3,r1,STACK_FRAME_OVERHEAD; \
+ SAVE_xSRR DSRR; \
+ SAVE_xSRR CSRR; \
+ SAVE_MMU_REGS; \
+ SAVE_xSRR SRR; \
EXC_XFER_TEMPLATE(hdlr, n+4, (MSR_KERNEL & ~(MSR_ME|MSR_DE|MSR_CE)), \
mcheck_transfer_to_handler, ret_from_mcheck_exc)
@@ -363,6 +399,9 @@ ALT_FTR_SECTION_END_IFSET(CPU_FTR_EMB_HV)
2: mfspr r4,SPRN_DBSR; \
stw r4,_ESR(r11); /* DebugException takes DBSR in _ESR */\
addi r3,r1,STACK_FRAME_OVERHEAD; \
+ SAVE_xSRR CSRR; \
+ SAVE_MMU_REGS; \
+ SAVE_xSRR SRR; \
EXC_XFER_TEMPLATE(DebugException, 0x2008, (MSR_KERNEL & ~(MSR_ME|MSR_DE|MSR_CE)), debug_transfer_to_handler, ret_from_debug_exc)
#define DEBUG_CRIT_EXCEPTION \
@@ -417,6 +456,8 @@ ALT_FTR_SECTION_END_IFSET(CPU_FTR_EMB_HV)
2: mfspr r4,SPRN_DBSR; \
stw r4,_ESR(r11); /* DebugException takes DBSR in _ESR */\
addi r3,r1,STACK_FRAME_OVERHEAD; \
+ SAVE_MMU_REGS; \
+ SAVE_xSRR SRR; \
EXC_XFER_TEMPLATE(DebugException, 0x2002, (MSR_KERNEL & ~(MSR_ME|MSR_DE|MSR_CE)), crit_transfer_to_handler, ret_from_crit_exc)
#define DATA_STORAGE_EXCEPTION \
--
2.25.0
^ permalink raw reply related
* [RFC PATCH v1 22/41] powerpc/32: Perform normal function call in exception entry
From: Christophe Leroy @ 2021-02-09 9:56 UTC (permalink / raw)
To: Benjamin Herrenschmidt, Paul Mackerras, Michael Ellerman, npiggin
Cc: linuxppc-dev, linux-kernel
In-Reply-To: <cover.1612864003.git.christophe.leroy@csgroup.eu>
Now that the MMU is re-enabled before calling the transfer function,
we don't need anymore that hack with the address of the handler and
the return function sitting just after the 'bl' to the transfer
fonction, that that function is retrieving via a read
relative to 'lr'.
Do a regular call to the transfer function, then to the handler,
then branch to the return function.
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
---
arch/powerpc/kernel/entry_32.S | 14 ++++----------
arch/powerpc/kernel/head_32.h | 4 ++--
arch/powerpc/kernel/head_booke.h | 6 +++---
3 files changed, 9 insertions(+), 15 deletions(-)
diff --git a/arch/powerpc/kernel/entry_32.S b/arch/powerpc/kernel/entry_32.S
index dce0f03a0e88..e448ee3f5f15 100644
--- a/arch/powerpc/kernel/entry_32.S
+++ b/arch/powerpc/kernel/entry_32.S
@@ -104,7 +104,7 @@ transfer_to_handler:
#ifdef CONFIG_PPC_BOOK3S_32
kuep_lock r11, r12
#endif
- b 3f
+ blr
2: /* if from kernel, check interrupted DOZE/NAP mode and
* check for stack overflow
@@ -119,13 +119,7 @@ transfer_to_handler:
#endif /* CONFIG_PPC_BOOK3S_32 || CONFIG_E500 */
.globl transfer_to_handler_cont
transfer_to_handler_cont:
-3:
- mflr r9
- lwz r11,0(r9) /* virtual address of handler */
- lwz r9,4(r9) /* where to go when done */
- mtctr r11
- mtlr r9
- bctr /* jump to handler */
+ blr
#if defined (CONFIG_PPC_BOOK3S_32) || defined(CONFIG_E500)
4: rlwinm r12,r12,0,~_TLF_NAPPING
@@ -404,8 +398,8 @@ fee_restarts:
stw r10,_TRAP(r11)
addi r3,r1,STACK_FRAME_OVERHEAD
bl transfer_to_handler_full
- .long unrecoverable_exception
- .long ret_from_except
+ bl unrecoverable_exception
+ b ret_from_except
#endif
.globl ret_from_except_full
diff --git a/arch/powerpc/kernel/head_32.h b/arch/powerpc/kernel/head_32.h
index 160ebd573c37..e09585b88ba7 100644
--- a/arch/powerpc/kernel/head_32.h
+++ b/arch/powerpc/kernel/head_32.h
@@ -190,8 +190,8 @@ _ASM_NOKPROBE_SYMBOL(\name\()_virt)
li r10,trap; \
stw r10,_TRAP(r11); \
bl tfer; \
- .long hdlr; \
- .long ret
+ bl hdlr; \
+ b ret
#define EXC_XFER_STD(n, hdlr) \
EXC_XFER_TEMPLATE(hdlr, n, MSR_KERNEL, transfer_to_handler_full, \
diff --git a/arch/powerpc/kernel/head_booke.h b/arch/powerpc/kernel/head_booke.h
index a57a312c7f86..4286f04648f8 100644
--- a/arch/powerpc/kernel/head_booke.h
+++ b/arch/powerpc/kernel/head_booke.h
@@ -322,9 +322,9 @@ ALT_FTR_SECTION_END_IFSET(CPU_FTR_EMB_HV)
#define EXC_XFER_TEMPLATE(hdlr, trap, msr, tfer, ret) \
li r10,trap; \
stw r10,_TRAP(r11); \
- bl tfer; \
- .long hdlr; \
- .long ret
+ bl tfer; \
+ bl hdlr; \
+ b ret; \
#define EXC_XFER_STD(n, hdlr) \
EXC_XFER_TEMPLATE(hdlr, n, MSR_KERNEL, transfer_to_handler_full, \
--
2.25.0
^ permalink raw reply related
* [RFC PATCH v1 23/41] powerpc/32: Always save non volatile registers on exception entry
From: Christophe Leroy @ 2021-02-09 9:56 UTC (permalink / raw)
To: Benjamin Herrenschmidt, Paul Mackerras, Michael Ellerman, npiggin
Cc: linuxppc-dev, linux-kernel
In-Reply-To: <cover.1612864003.git.christophe.leroy@csgroup.eu>
In preparation of handling exception entry and exit in C,
in order to simplify the handling, always save non volatile registers
when entering an exception.
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
---
arch/powerpc/include/asm/ptrace.h | 13 ++++---------
arch/powerpc/kernel/entry_32.S | 13 +------------
arch/powerpc/kernel/head_32.h | 3 +--
arch/powerpc/kernel/head_booke.h | 2 +-
4 files changed, 7 insertions(+), 24 deletions(-)
diff --git a/arch/powerpc/include/asm/ptrace.h b/arch/powerpc/include/asm/ptrace.h
index 2c842b11a924..979bd0d4d371 100644
--- a/arch/powerpc/include/asm/ptrace.h
+++ b/arch/powerpc/include/asm/ptrace.h
@@ -194,7 +194,6 @@ static inline void regs_set_return_value(struct pt_regs *regs, unsigned long rc)
#define FULL_REGS(regs) (((regs)->trap & 1) == 0)
#define SET_FULL_REGS(regs) ((regs)->trap |= 1)
#endif
-#define CHECK_FULL_REGS(regs) BUG_ON(!FULL_REGS(regs))
#define NV_REG_POISON 0xdeadbeefdeadbeefUL
#else
/*
@@ -204,20 +203,16 @@ static inline void regs_set_return_value(struct pt_regs *regs, unsigned long rc)
* On 4xx we use the next bit to indicate whether the exception
* is a critical exception (1 means it is).
*/
-#define TRAP_FLAGS_MASK 0x1F
+#define TRAP_FLAGS_MASK 0x1e
#define TRAP(regs) ((regs)->trap & ~TRAP_FLAGS_MASK)
-#define FULL_REGS(regs) (((regs)->trap & 1) == 0)
-#define SET_FULL_REGS(regs) ((regs)->trap |= 1)
+#define FULL_REGS(regs) true
+#define SET_FULL_REGS(regs) do { } while (0)
#define IS_CRITICAL_EXC(regs) (((regs)->trap & 2) != 0)
#define IS_MCHECK_EXC(regs) (((regs)->trap & 4) != 0)
#define IS_DEBUG_EXC(regs) (((regs)->trap & 8) != 0)
#define NV_REG_POISON 0xdeadbeef
-#define CHECK_FULL_REGS(regs) \
-do { \
- if ((regs)->trap & 1) \
- printk(KERN_CRIT "%s: partial register set\n", __func__); \
-} while (0)
#endif /* __powerpc64__ */
+#define CHECK_FULL_REGS(regs) BUG_ON(!FULL_REGS(regs))
static inline void set_trap(struct pt_regs *regs, unsigned long val)
{
diff --git a/arch/powerpc/kernel/entry_32.S b/arch/powerpc/kernel/entry_32.S
index e448ee3f5f15..bbce2de4c6a8 100644
--- a/arch/powerpc/kernel/entry_32.S
+++ b/arch/powerpc/kernel/entry_32.S
@@ -81,12 +81,12 @@ _ASM_NOKPROBE_SYMBOL(crit_transfer_to_handler)
*/
.globl transfer_to_handler_full
transfer_to_handler_full:
- SAVE_NVGPRS(r11)
_ASM_NOKPROBE_SYMBOL(transfer_to_handler_full)
/* fall through */
.globl transfer_to_handler
transfer_to_handler:
+ SAVE_NVGPRS(r11)
stw r2,GPR2(r11)
stw r12,_NIP(r11)
stw r9,_MSR(r11)
@@ -234,10 +234,6 @@ handle_page_fault:
bl do_page_fault
cmpwi r3,0
beq+ ret_from_except
- SAVE_NVGPRS(r1)
- lwz r0,_TRAP(r1)
- clrrwi r0,r0,1
- stw r0,_TRAP(r1)
mr r4,r3 /* err arg for bad_page_fault */
addi r3,r1,STACK_FRAME_OVERHEAD
bl __bad_page_fault
@@ -810,13 +806,6 @@ recheck:
do_user_signal: /* r10 contains MSR_KERNEL here */
ori r10,r10,MSR_EE
mtmsr r10 /* hard-enable interrupts */
- /* save r13-r31 in the exception frame, if not already done */
- lwz r3,_TRAP(r1)
- andi. r0,r3,1
- beq 2f
- SAVE_NVGPRS(r1)
- rlwinm r3,r3,0,0,30
- stw r3,_TRAP(r1)
2: addi r3,r1,STACK_FRAME_OVERHEAD
mr r4,r9
bl do_notify_resume
diff --git a/arch/powerpc/kernel/head_32.h b/arch/powerpc/kernel/head_32.h
index e09585b88ba7..087445e45489 100644
--- a/arch/powerpc/kernel/head_32.h
+++ b/arch/powerpc/kernel/head_32.h
@@ -198,7 +198,7 @@ _ASM_NOKPROBE_SYMBOL(\name\()_virt)
ret_from_except_full)
#define EXC_XFER_LITE(n, hdlr) \
- EXC_XFER_TEMPLATE(hdlr, n+1, MSR_KERNEL, transfer_to_handler, \
+ EXC_XFER_TEMPLATE(hdlr, n, MSR_KERNEL, transfer_to_handler, \
ret_from_except)
.macro vmap_stack_overflow_exception
@@ -215,7 +215,6 @@ _ASM_NOKPROBE_SYMBOL(\name\()_virt)
lwz r1, emergency_ctx@l(r1)
addi r1, r1, THREAD_SIZE - INT_FRAME_SIZE
EXCEPTION_PROLOG_2 vmap_stack_overflow
- SAVE_NVGPRS(r11)
addi r3, r1, STACK_FRAME_OVERHEAD
EXC_XFER_STD(0, stack_overflow_exception)
.endm
diff --git a/arch/powerpc/kernel/head_booke.h b/arch/powerpc/kernel/head_booke.h
index 4286f04648f8..c88c1c474381 100644
--- a/arch/powerpc/kernel/head_booke.h
+++ b/arch/powerpc/kernel/head_booke.h
@@ -331,7 +331,7 @@ ALT_FTR_SECTION_END_IFSET(CPU_FTR_EMB_HV)
ret_from_except_full)
#define EXC_XFER_LITE(n, hdlr) \
- EXC_XFER_TEMPLATE(hdlr, n+1, MSR_KERNEL, transfer_to_handler, \
+ EXC_XFER_TEMPLATE(hdlr, n, MSR_KERNEL, transfer_to_handler, \
ret_from_except)
/* Check for a single step debug exception while in an exception
--
2.25.0
^ permalink raw reply related
* [RFC PATCH v1 24/41] powerpc/32: Replace ASM exception exit by C exception exit from ppc64
From: Christophe Leroy @ 2021-02-09 9:56 UTC (permalink / raw)
To: Benjamin Herrenschmidt, Paul Mackerras, Michael Ellerman, npiggin
Cc: linuxppc-dev, linux-kernel
In-Reply-To: <cover.1612864003.git.christophe.leroy@csgroup.eu>
This patch replaces the PPC32 ASM exceptio exit by C exception exit.
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
---
arch/powerpc/kernel/entry_32.S | 466 +++++++++------------------------
1 file changed, 122 insertions(+), 344 deletions(-)
diff --git a/arch/powerpc/kernel/entry_32.S b/arch/powerpc/kernel/entry_32.S
index bbce2de4c6a8..9a75ccb800e7 100644
--- a/arch/powerpc/kernel/entry_32.S
+++ b/arch/powerpc/kernel/entry_32.S
@@ -130,9 +130,7 @@ transfer_to_handler_cont:
stw r12,TI_LOCAL_FLAGS(r2)
lwz r9,_MSR(r11) /* if sleeping, clear MSR.EE */
rlwinm r9,r9,0,~MSR_EE
- lwz r12,_LINK(r11) /* and return to address in LR */
- kuap_restore r11, r2, r3, r4, r5
- lwz r2, GPR2(r11)
+ stw r9,_MSR(r11)
b fast_exception_return
#endif
_ASM_NOKPROBE_SYMBOL(transfer_to_handler)
@@ -334,69 +332,20 @@ END_FTR_SECTION_IFSET(CPU_FTR_SPE)
.globl fast_exception_return
fast_exception_return:
+ lwz r6,_MSR(r1)
+ andi. r0,r6,MSR_PR
+ bne .Lfast_user_interrupt_return
+ li r3,0 /* 0 return value, no EMULATE_STACK_STORE */
#if !(defined(CONFIG_4xx) || defined(CONFIG_BOOKE))
- andi. r10,r9,MSR_RI /* check for recoverable interrupt */
- beq 1f /* if not, we've got problems */
-#endif
-
-2: REST_4GPRS(3, r11)
- lwz r10,_CCR(r11)
- REST_GPR(1, r11)
- mtcr r10
- lwz r10,_LINK(r11)
- mtlr r10
- /* Clear the exception_marker on the stack to avoid confusing stacktrace */
- li r10, 0
- stw r10, 8(r11)
- REST_GPR(10, r11)
-#if defined(CONFIG_PPC_8xx) && defined(CONFIG_PERF_EVENTS)
- mtspr SPRN_NRI, r0
-#endif
- mtspr SPRN_SRR1,r9
- mtspr SPRN_SRR0,r12
- REST_GPR(9, r11)
- REST_GPR(12, r11)
- lwz r11,GPR11(r11)
- rfi
-#ifdef CONFIG_40x
- b . /* Prevent prefetch past rfi */
-#endif
-_ASM_NOKPROBE_SYMBOL(fast_exception_return)
-
-#if !(defined(CONFIG_4xx) || defined(CONFIG_BOOKE))
-/* check if the exception happened in a restartable section */
-1: lis r3,exc_exit_restart_end@ha
- addi r3,r3,exc_exit_restart_end@l
- cmplw r12,r3
- bge 3f
- lis r4,exc_exit_restart@ha
- addi r4,r4,exc_exit_restart@l
- cmplw r12,r4
- blt 3f
- lis r3,fee_restarts@ha
- tophys(r3,r3)
- lwz r5,fee_restarts@l(r3)
- addi r5,r5,1
- stw r5,fee_restarts@l(r3)
- mr r12,r4 /* restart at exc_exit_restart */
- b 2b
-
- .section .bss
- .align 2
-fee_restarts:
- .space 4
- .previous
-
-/* aargh, a nonrecoverable interrupt, panic */
-/* aargh, we don't know which trap this is */
-3:
- li r10,-1
- stw r10,_TRAP(r11)
+ andi. r0,r6,MSR_RI
+ bne+ .Lfast_kernel_interrupt_return
addi r3,r1,STACK_FRAME_OVERHEAD
- bl transfer_to_handler_full
bl unrecoverable_exception
- b ret_from_except
+ trap /* should not get here */
+#else
+ b .Lfast_kernel_interrupt_return
#endif
+_ASM_NOKPROBE_SYMBOL(fast_exception_return)
.globl ret_from_except_full
ret_from_except_full:
@@ -405,213 +354,141 @@ ret_from_except_full:
.globl ret_from_except
ret_from_except:
- /* Hard-disable interrupts so that current_thread_info()->flags
- * can't change between when we test it and when we return
- * from the interrupt. */
- /* Note: We don't bother telling lockdep about it */
- LOAD_REG_IMMEDIATE(r10,MSR_KERNEL)
- mtmsr r10 /* disable interrupts */
-
- lwz r3,_MSR(r1) /* Returning to user mode? */
- andi. r0,r3,MSR_PR
- beq resume_kernel
-
-user_exc_return: /* r10 contains MSR_KERNEL here */
- /* Check current_thread_info()->flags */
- lwz r9,TI_FLAGS(r2)
- andi. r0,r9,_TIF_USER_WORK_MASK
- bne do_work
-
-restore_user:
-#if defined(CONFIG_4xx) || defined(CONFIG_BOOKE)
- /* Check whether this process has its own DBCR0 value. The internal
- debug mode bit tells us that dbcr0 should be loaded. */
- lwz r0,THREAD+THREAD_DBCR0(r2)
- andis. r10,r0,DBCR0_IDM@h
- bnel- load_dbcr0
-#endif
- ACCOUNT_CPU_USER_EXIT(r2, r10, r11)
+_ASM_NOKPROBE_SYMBOL(ret_from_except)
+
+ .globl interrupt_return
+interrupt_return:
+ lwz r4,_MSR(r1)
+ andi. r0,r4,MSR_PR
+ beq .Lkernel_interrupt_return
+ addi r3,r1,STACK_FRAME_OVERHEAD
+ bl interrupt_exit_user_prepare
+ cmpwi r3,0
+ bne- .Lrestore_nvgprs
+
+.Lfast_user_interrupt_return:
#ifdef CONFIG_PPC_BOOK3S_32
kuep_unlock r10, r11
#endif
+ kuap_check r2, r4
+ lwz r11,_NIP(r1)
+ lwz r12,_MSR(r1)
+ mtspr SPRN_SRR0,r11
+ mtspr SPRN_SRR1,r12
- b restore
-
-/* N.B. the only way to get here is from the beq following ret_from_except. */
-resume_kernel:
- /* check current_thread_info, _TIF_EMULATE_STACK_STORE */
- lwz r8,TI_FLAGS(r2)
- andis. r0,r8,_TIF_EMULATE_STACK_STORE@h
- beq+ 1f
+BEGIN_FTR_SECTION
+ stwcx. r0,0,r1 /* to clear the reservation */
+FTR_SECTION_ELSE
+ lwarx r0,0,r1
+ALT_FTR_SECTION_END_IFCLR(CPU_FTR_STCX_CHECKS_ADDRESS)
- addi r8,r1,INT_FRAME_SIZE /* Get the kprobed function entry */
+ lwz r3,_CCR(r1)
+ lwz r4,_LINK(r1)
+ lwz r5,_CTR(r1)
+ lwz r6,_XER(r1)
+ li r0,0
- lwz r3,GPR1(r1)
- subi r3,r3,INT_FRAME_SIZE /* dst: Allocate a trampoline exception frame */
- mr r4,r1 /* src: current exception frame */
- mr r1,r3 /* Reroute the trampoline frame to r1 */
+ REST_4GPRS(7, r1)
+ REST_2GPRS(11, r1)
- /* Copy from the original to the trampoline. */
- li r5,INT_FRAME_SIZE/4 /* size: INT_FRAME_SIZE */
- li r6,0 /* start offset: 0 */
+ mtcr r3
+ mtlr r4
mtctr r5
-2: lwzx r0,r6,r4
- stwx r0,r6,r3
- addi r6,r6,4
- bdnz 2b
-
- /* Do real store operation to complete stwu */
- lwz r5,GPR1(r1)
- stw r8,0(r5)
-
- /* Clear _TIF_EMULATE_STACK_STORE flag */
- lis r11,_TIF_EMULATE_STACK_STORE@h
- addi r5,r2,TI_FLAGS
-0: lwarx r8,0,r5
- andc r8,r8,r11
- stwcx. r8,0,r5
- bne- 0b
-1:
+ mtspr SPRN_XER,r6
-#ifdef CONFIG_PREEMPTION
- /* check current_thread_info->preempt_count */
- lwz r0,TI_PREEMPT(r2)
- cmpwi 0,r0,0 /* if non-zero, just restore regs and return */
- bne restore_kuap
- andi. r8,r8,_TIF_NEED_RESCHED
- beq+ restore_kuap
- lwz r3,_MSR(r1)
- andi. r0,r3,MSR_EE /* interrupts off? */
- beq restore_kuap /* don't schedule if so */
-#ifdef CONFIG_TRACE_IRQFLAGS
- /* Lockdep thinks irqs are enabled, we need to call
- * preempt_schedule_irq with IRQs off, so we inform lockdep
- * now that we -did- turn them off already
- */
- bl trace_hardirqs_off
-#endif
- bl preempt_schedule_irq
-#ifdef CONFIG_TRACE_IRQFLAGS
- /* And now, to properly rebalance the above, we tell lockdep they
- * are being turned back on, which will happen when we return
- */
- bl trace_hardirqs_on
+ REST_4GPRS(2, r1)
+ REST_GPR(6, r1)
+ REST_GPR(0, r1)
+ REST_GPR(1, r1)
+ rfi
+#ifdef CONFIG_40x
+ b . /* Prevent prefetch past rfi */
#endif
-#endif /* CONFIG_PREEMPTION */
-restore_kuap:
- kuap_restore r1, r2, r9, r10, r0
- /* interrupts are hard-disabled at this point */
-restore:
-#if defined(CONFIG_44x) && !defined(CONFIG_PPC_47x)
- lis r4,icache_44x_need_flush@ha
- lwz r5,icache_44x_need_flush@l(r4)
- cmplwi cr0,r5,0
- beq+ 1f
- li r6,0
- iccci r0,r0
- stw r6,icache_44x_need_flush@l(r4)
-1:
-#endif /* CONFIG_44x */
-
- lwz r9,_MSR(r1)
-#ifdef CONFIG_TRACE_IRQFLAGS
- /* Lockdep doesn't know about the fact that IRQs are temporarily turned
- * off in this assembly code while peeking at TI_FLAGS() and such. However
- * we need to inform it if the exception turned interrupts off, and we
- * are about to trun them back on.
- */
- andi. r10,r9,MSR_EE
- beq 1f
- stwu r1,-32(r1)
- mflr r0
- stw r0,4(r1)
- bl trace_hardirqs_on
- addi r1, r1, 32
- lwz r9,_MSR(r1)
-1:
-#endif /* CONFIG_TRACE_IRQFLAGS */
+.Lrestore_nvgprs:
+ REST_NVGPRS(r1)
+ b .Lfast_user_interrupt_return
- lwz r0,GPR0(r1)
- lwz r2,GPR2(r1)
- REST_4GPRS(3, r1)
- REST_2GPRS(7, r1)
+.Lkernel_interrupt_return:
+ addi r3,r1,STACK_FRAME_OVERHEAD
+ bl interrupt_exit_kernel_prepare
- lwz r10,_XER(r1)
- lwz r11,_CTR(r1)
- mtspr SPRN_XER,r10
- mtctr r11
+.Lfast_kernel_interrupt_return:
+ cmpwi cr1,r3,0
+ kuap_restore r1, r2, r3, r4, r5
+ lwz r11,_NIP(r1)
+ lwz r12,_MSR(r1)
+ mtspr SPRN_SRR0,r11
+ mtspr SPRN_SRR1,r12
BEGIN_FTR_SECTION
- lwarx r11,0,r1
-END_FTR_SECTION_IFSET(CPU_FTR_NEED_PAIRED_STWCX)
- stwcx. r0,0,r1 /* to clear the reservation */
+ stwcx. r0,0,r1 /* to clear the reservation */
+FTR_SECTION_ELSE
+ lwarx r0,0,r1
+ALT_FTR_SECTION_END_IFCLR(CPU_FTR_STCX_CHECKS_ADDRESS)
-#if !(defined(CONFIG_4xx) || defined(CONFIG_BOOKE))
- andi. r10,r9,MSR_RI /* check if this exception occurred */
- beql nonrecoverable /* at a bad place (MSR:RI = 0) */
+ lwz r3,_LINK(r1)
+ lwz r4,_CTR(r1)
+ lwz r5,_XER(r1)
+ lwz r6,_CCR(r1)
+ li r0,0
- lwz r10,_CCR(r1)
- lwz r11,_LINK(r1)
- mtcrf 0xFF,r10
- mtlr r11
+ REST_4GPRS(7, r1)
+ REST_2GPRS(11, r1)
+
+ mtlr r3
+ mtctr r4
+ mtspr SPRN_XER,r5
- /* Clear the exception_marker on the stack to avoid confusing stacktrace */
- li r10, 0
- stw r10, 8(r1)
/*
- * Once we put values in SRR0 and SRR1, we are in a state
- * where exceptions are not recoverable, since taking an
- * exception will trash SRR0 and SRR1. Therefore we clear the
- * MSR:RI bit to indicate this. If we do take an exception,
- * we can't return to the point of the exception but we
- * can restart the exception exit path at the label
- * exc_exit_restart below. -- paulus
+ * Leaving a stale exception_marker on the stack can confuse
+ * the reliable stack unwinder later on. Clear it.
*/
- LOAD_REG_IMMEDIATE(r10,MSR_KERNEL & ~MSR_RI)
- mtmsr r10 /* clear the RI bit */
- .globl exc_exit_restart
-exc_exit_restart:
- lwz r12,_NIP(r1)
- mtspr SPRN_SRR0,r12
- mtspr SPRN_SRR1,r9
- REST_4GPRS(9, r1)
- lwz r1,GPR1(r1)
- .globl exc_exit_restart_end
-exc_exit_restart_end:
+ stw r0,8(r1)
+
+ REST_4GPRS(2, r1)
+
+ bne- cr1,1f /* emulate stack store */
+ mtcr r6
+ REST_GPR(6, r1)
+ REST_GPR(0, r1)
+ REST_GPR(1, r1)
rfi
-_ASM_NOKPROBE_SYMBOL(exc_exit_restart)
-_ASM_NOKPROBE_SYMBOL(exc_exit_restart_end)
+#ifdef CONFIG_40x
+ b . /* Prevent prefetch past rfi */
+#endif
-#else /* !(CONFIG_4xx || CONFIG_BOOKE) */
- /*
- * This is a bit different on 4xx/Book-E because it doesn't have
- * the RI bit in the MSR.
- * The TLB miss handler checks if we have interrupted
- * the exception exit path and restarts it if so
- * (well maybe one day it will... :).
+1: /*
+ * Emulate stack store with update. New r1 value was already calculated
+ * and updated in our interrupt regs by emulate_loadstore, but we can't
+ * store the previous value of r1 to the stack before re-loading our
+ * registers from it, otherwise they could be clobbered. Use
+ * SPRG Scratch0 in thread struct as temporary storage to hold the store
+ * data, as interrupts are disabled here so it won't be clobbered.
*/
- lwz r11,_LINK(r1)
- mtlr r11
- lwz r10,_CCR(r1)
- mtcrf 0xff,r10
- /* Clear the exception_marker on the stack to avoid confusing stacktrace */
- li r10, 0
- stw r10, 8(r1)
- REST_2GPRS(9, r1)
- .globl exc_exit_restart
-exc_exit_restart:
- lwz r11,_NIP(r1)
- lwz r12,_MSR(r1)
- mtspr SPRN_SRR0,r11
- mtspr SPRN_SRR1,r12
- REST_2GPRS(11, r1)
- lwz r1,GPR1(r1)
- .globl exc_exit_restart_end
-exc_exit_restart_end:
+ mtcr r6
+#ifdef CONFIG_BOOKE
+ mtspr SPRN_SPRG_WSCRATCH0, r9
+#else
+ mtspr SPRN_SPRG_SCRATCH0, r9
+#endif
+ addi r9,r1,INT_FRAME_SIZE /* get original r1 */
+ REST_GPR(6, r1)
+ REST_GPR(0, r1)
+ REST_GPR(1, r1)
+ stw r9,0(r1) /* perform store component of stdu */
+#ifdef CONFIG_BOOKE
+ mtspr r9, SPRN_SPRG_RSCRATCH0
+#else
+ mfspr r9, SPRN_SPRG_SCRATCH0
+#endif
rfi
- b . /* prevent prefetch past rfi */
-_ASM_NOKPROBE_SYMBOL(exc_exit_restart)
+#ifdef CONFIG_40x
+ b . /* Prevent prefetch past rfi */
+#endif
+_ASM_NOKPROBE_SYMBOL(interrupt_return)
+
+#if defined(CONFIG_4xx) || defined(CONFIG_BOOKE)
/*
* Returning from a critical interrupt in user mode doesn't need
@@ -747,30 +624,6 @@ ret_from_mcheck_exc:
_ASM_NOKPROBE_SYMBOL(ret_from_mcheck_exc)
#endif /* CONFIG_BOOKE */
-/*
- * Load the DBCR0 value for a task that is being ptraced,
- * having first saved away the global DBCR0. Note that r0
- * has the dbcr0 value to set upon entry to this.
- */
-load_dbcr0:
- mfmsr r10 /* first disable debug exceptions */
- rlwinm r10,r10,0,~MSR_DE
- mtmsr r10
- isync
- mfspr r10,SPRN_DBCR0
- lis r11,global_dbcr0@ha
- addi r11,r11,global_dbcr0@l
-#ifdef CONFIG_SMP
- lwz r9,TASK_CPU(r2)
- slwi r9,r9,2
- add r11,r11,r9
-#endif
- stw r10,0(r11)
- mtspr SPRN_DBCR0,r0
- li r11,-1
- mtspr SPRN_DBSR,r11 /* clear all pending debug events */
- blr
-
.section .bss
.align 4
.global global_dbcr0
@@ -779,81 +632,6 @@ global_dbcr0:
.previous
#endif /* !(CONFIG_4xx || CONFIG_BOOKE) */
-do_work: /* r10 contains MSR_KERNEL here */
- andi. r0,r9,_TIF_NEED_RESCHED
- beq do_user_signal
-
-do_resched: /* r10 contains MSR_KERNEL here */
-#ifdef CONFIG_TRACE_IRQFLAGS
- bl trace_hardirqs_on
- mfmsr r10
-#endif
- ori r10,r10,MSR_EE
- mtmsr r10 /* hard-enable interrupts */
- bl schedule
-recheck:
- /* Note: And we don't tell it we are disabling them again
- * neither. Those disable/enable cycles used to peek at
- * TI_FLAGS aren't advertised.
- */
- LOAD_REG_IMMEDIATE(r10,MSR_KERNEL)
- mtmsr r10 /* disable interrupts */
- lwz r9,TI_FLAGS(r2)
- andi. r0,r9,_TIF_NEED_RESCHED
- bne- do_resched
- andi. r0,r9,_TIF_USER_WORK_MASK
- beq restore_user
-do_user_signal: /* r10 contains MSR_KERNEL here */
- ori r10,r10,MSR_EE
- mtmsr r10 /* hard-enable interrupts */
-2: addi r3,r1,STACK_FRAME_OVERHEAD
- mr r4,r9
- bl do_notify_resume
- REST_NVGPRS(r1)
- b recheck
-
-/*
- * We come here when we are at the end of handling an exception
- * that occurred at a place where taking an exception will lose
- * state information, such as the contents of SRR0 and SRR1.
- */
-nonrecoverable:
- lis r10,exc_exit_restart_end@ha
- addi r10,r10,exc_exit_restart_end@l
- cmplw r12,r10
- bge 3f
- lis r11,exc_exit_restart@ha
- addi r11,r11,exc_exit_restart@l
- cmplw r12,r11
- blt 3f
- lis r10,ee_restarts@ha
- lwz r12,ee_restarts@l(r10)
- addi r12,r12,1
- stw r12,ee_restarts@l(r10)
- mr r12,r11 /* restart at exc_exit_restart */
- blr
-3: /* OK, we can't recover, kill this process */
- lwz r3,_TRAP(r1)
- andi. r0,r3,1
- beq 5f
- SAVE_NVGPRS(r1)
- rlwinm r3,r3,0,0,30
- stw r3,_TRAP(r1)
-5: mfspr r2,SPRN_SPRG_THREAD
- addi r2,r2,-THREAD
- tovirt(r2,r2) /* set back r2 to current */
-4: addi r3,r1,STACK_FRAME_OVERHEAD
- bl unrecoverable_exception
- /* shouldn't return */
- b 4b
-_ASM_NOKPROBE_SYMBOL(nonrecoverable)
-
- .section .bss
- .align 2
-ee_restarts:
- .space 4
- .previous
-
/*
* PROM code for specific machines follows. Put it
* here so it's easy to add arch-specific sections later.
--
2.25.0
^ permalink raw reply related
* [RFC PATCH v1 25/41] powerpc/32: Set regs parameter in r3 in transfer_to_handler
From: Christophe Leroy @ 2021-02-09 9:56 UTC (permalink / raw)
To: Benjamin Herrenschmidt, Paul Mackerras, Michael Ellerman, npiggin
Cc: linuxppc-dev, linux-kernel
In-Reply-To: <cover.1612864003.git.christophe.leroy@csgroup.eu>
All exception handlers take regs as first parameter.
Instead of setting r3 just before each call to a handler, set
it in transfer_to_handler.
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
---
arch/powerpc/kernel/entry_32.S | 5 ++---
arch/powerpc/kernel/head_32.h | 2 --
arch/powerpc/kernel/head_40x.S | 7 -------
arch/powerpc/kernel/head_8xx.S | 3 ---
arch/powerpc/kernel/head_book3s_32.S | 9 ++-------
arch/powerpc/kernel/head_booke.h | 11 +----------
arch/powerpc/kernel/head_fsl_booke.S | 4 +---
7 files changed, 6 insertions(+), 35 deletions(-)
diff --git a/arch/powerpc/kernel/entry_32.S b/arch/powerpc/kernel/entry_32.S
index 9a75ccb800e7..0b4fdc930aa5 100644
--- a/arch/powerpc/kernel/entry_32.S
+++ b/arch/powerpc/kernel/entry_32.S
@@ -87,6 +87,7 @@ _ASM_NOKPROBE_SYMBOL(transfer_to_handler_full)
.globl transfer_to_handler
transfer_to_handler:
SAVE_NVGPRS(r11)
+ addi r3,r1,STACK_FRAME_OVERHEAD
stw r2,GPR2(r11)
stw r12,_NIP(r11)
stw r9,_MSR(r11)
@@ -99,8 +100,7 @@ transfer_to_handler:
tovirt(r12, r12)
beq 2f /* if from user, fix up THREAD.regs */
addi r2, r12, -THREAD
- addi r11,r1,STACK_FRAME_OVERHEAD
- stw r11,PT_REGS(r12)
+ stw r3,PT_REGS(r12)
#ifdef CONFIG_PPC_BOOK3S_32
kuep_lock r11, r12
#endif
@@ -228,7 +228,6 @@ ret_from_kernel_thread:
*/
.globl handle_page_fault
handle_page_fault:
- addi r3,r1,STACK_FRAME_OVERHEAD
bl do_page_fault
cmpwi r3,0
beq+ ret_from_except
diff --git a/arch/powerpc/kernel/head_32.h b/arch/powerpc/kernel/head_32.h
index 087445e45489..4d638d760a96 100644
--- a/arch/powerpc/kernel/head_32.h
+++ b/arch/powerpc/kernel/head_32.h
@@ -183,7 +183,6 @@ _ASM_NOKPROBE_SYMBOL(\name\()_virt)
#define EXCEPTION(n, label, hdlr, xfer) \
START_EXCEPTION(n, label) \
EXCEPTION_PROLOG label; \
- addi r3,r1,STACK_FRAME_OVERHEAD; \
xfer(n, hdlr)
#define EXC_XFER_TEMPLATE(hdlr, trap, msr, tfer, ret) \
@@ -215,7 +214,6 @@ _ASM_NOKPROBE_SYMBOL(\name\()_virt)
lwz r1, emergency_ctx@l(r1)
addi r1, r1, THREAD_SIZE - INT_FRAME_SIZE
EXCEPTION_PROLOG_2 vmap_stack_overflow
- addi r3, r1, STACK_FRAME_OVERHEAD
EXC_XFER_STD(0, stack_overflow_exception)
.endm
diff --git a/arch/powerpc/kernel/head_40x.S b/arch/powerpc/kernel/head_40x.S
index 86883ccb3dc5..08563d4170c6 100644
--- a/arch/powerpc/kernel/head_40x.S
+++ b/arch/powerpc/kernel/head_40x.S
@@ -185,7 +185,6 @@ _ASM_NOKPROBE_SYMBOL(\name\()_virt)
#define CRITICAL_EXCEPTION(n, label, hdlr) \
START_EXCEPTION(n, label); \
CRITICAL_EXCEPTION_PROLOG label; \
- addi r3,r1,STACK_FRAME_OVERHEAD; \
EXC_XFER_TEMPLATE(hdlr, n+2, (MSR_KERNEL & ~(MSR_ME|MSR_DE|MSR_CE)), \
crit_transfer_to_handler, ret_from_crit_exc)
@@ -227,13 +226,11 @@ _ASM_NOKPROBE_SYMBOL(\name\()_virt)
/* 0x0600 - Alignment Exception */
START_EXCEPTION(0x0600, Alignment)
EXCEPTION_PROLOG Alignment handle_dar_dsisr=1
- addi r3,r1,STACK_FRAME_OVERHEAD
EXC_XFER_STD(0x600, alignment_exception)
/* 0x0700 - Program Exception */
START_EXCEPTION(0x0700, ProgramCheck)
EXCEPTION_PROLOG ProgramCheck handle_dar_dsisr=1
- addi r3,r1,STACK_FRAME_OVERHEAD
EXC_XFER_STD(0x700, program_check_exception)
EXCEPTION(0x0800, Trap_08, unknown_exception, EXC_XFER_STD)
@@ -494,7 +491,6 @@ _ASM_NOKPROBE_SYMBOL(\name\()_virt)
/* continue normal handling for a critical exception... */
2: mfspr r4,SPRN_DBSR
stw r4,_ESR(r11) /* DebugException takes DBSR in _ESR */
- addi r3,r1,STACK_FRAME_OVERHEAD
EXC_XFER_TEMPLATE(DebugException, 0x2002, \
(MSR_KERNEL & ~(MSR_ME|MSR_DE|MSR_CE)), \
crit_transfer_to_handler, ret_from_crit_exc)
@@ -505,21 +501,18 @@ Decrementer:
EXCEPTION_PROLOG Decrementer
lis r0,TSR_PIS@h
mtspr SPRN_TSR,r0 /* Clear the PIT exception */
- addi r3,r1,STACK_FRAME_OVERHEAD
EXC_XFER_LITE(0x1000, timer_interrupt)
/* Fixed Interval Timer (FIT) Exception. (from 0x1010) */
__HEAD
FITException:
EXCEPTION_PROLOG FITException
- addi r3,r1,STACK_FRAME_OVERHEAD;
EXC_XFER_STD(0x1010, unknown_exception)
/* Watchdog Timer (WDT) Exception. (from 0x1020) */
__HEAD
WDTException:
CRITICAL_EXCEPTION_PROLOG WDTException
- addi r3,r1,STACK_FRAME_OVERHEAD;
EXC_XFER_TEMPLATE(WatchdogException, 0x1020+2,
(MSR_KERNEL & ~(MSR_ME|MSR_DE|MSR_CE)),
crit_transfer_to_handler, ret_from_crit_exc)
diff --git a/arch/powerpc/kernel/head_8xx.S b/arch/powerpc/kernel/head_8xx.S
index 932702a38234..eb1d40a8f2c4 100644
--- a/arch/powerpc/kernel/head_8xx.S
+++ b/arch/powerpc/kernel/head_8xx.S
@@ -123,7 +123,6 @@ instruction_counter:
/* Machine check */
START_EXCEPTION(0x200, MachineCheck)
EXCEPTION_PROLOG MachineCheck handle_dar_dsisr=1
- addi r3,r1,STACK_FRAME_OVERHEAD
EXC_XFER_STD(0x200, machine_check_exception)
/* External interrupt */
@@ -132,7 +131,6 @@ instruction_counter:
/* Alignment exception */
START_EXCEPTION(0x600, Alignment)
EXCEPTION_PROLOG Alignment handle_dar_dsisr=1
- addi r3,r1,STACK_FRAME_OVERHEAD
EXC_XFER_STD(0x600, alignment_exception)
/* Program check exception */
@@ -348,7 +346,6 @@ DARFixed:/* Return from dcbx instruction bug workaround */
1: EXCEPTION_PROLOG_1
EXCEPTION_PROLOG_2 DataBreakpoint handle_dar_dsisr=1
- addi r3,r1,STACK_FRAME_OVERHEAD
mfspr r4,SPRN_BAR
stw r4,_DAR(r11)
EXC_XFER_STD(0x1c00, do_break)
diff --git a/arch/powerpc/kernel/head_book3s_32.S b/arch/powerpc/kernel/head_book3s_32.S
index 24cb245e1c5b..626e9fbac2cc 100644
--- a/arch/powerpc/kernel/head_book3s_32.S
+++ b/arch/powerpc/kernel/head_book3s_32.S
@@ -267,7 +267,6 @@ __secondary_hold_acknowledge:
#endif /* CONFIG_PPC_CHRP */
EXCEPTION_PROLOG_1
7: EXCEPTION_PROLOG_2 MachineCheck
- addi r3,r1,STACK_FRAME_OVERHEAD
#ifdef CONFIG_PPC_CHRP
beq cr1, 1f
twi 31, 0, 0
@@ -337,7 +336,6 @@ END_MMU_FTR_SECTION_IFSET(MMU_FTR_HPTE_TABLE)
/* Alignment exception */
START_EXCEPTION(0x600, Alignment)
EXCEPTION_PROLOG Alignment handle_dar_dsisr=1
- addi r3,r1,STACK_FRAME_OVERHEAD
EXC_XFER_STD(0x600, alignment_exception)
/* Program check exception */
@@ -357,8 +355,7 @@ END_FTR_SECTION_IFSET(CPU_FTR_FPU_UNAVAILABLE)
beq 1f
bl load_up_fpu /* if from user, just load it up */
b fast_exception_return
-1: addi r3,r1,STACK_FRAME_OVERHEAD
- EXC_XFER_LITE(0x800, kernel_fp_unavailable_exception)
+1: EXC_XFER_LITE(0x800, kernel_fp_unavailable_exception)
#else
b ProgramCheck
#endif
@@ -719,13 +716,11 @@ AltiVecUnavailable:
bl load_up_altivec /* if from user, just load it up */
b fast_exception_return
#endif /* CONFIG_ALTIVEC */
-1: addi r3,r1,STACK_FRAME_OVERHEAD
- EXC_XFER_LITE(0xf20, altivec_unavailable_exception)
+1: EXC_XFER_LITE(0xf20, altivec_unavailable_exception)
__HEAD
PerformanceMonitor:
EXCEPTION_PROLOG PerformanceMonitor
- addi r3,r1,STACK_FRAME_OVERHEAD
EXC_XFER_STD(0xf00, performance_monitor_exception)
diff --git a/arch/powerpc/kernel/head_booke.h b/arch/powerpc/kernel/head_booke.h
index c88c1c474381..740ddf506efc 100644
--- a/arch/powerpc/kernel/head_booke.h
+++ b/arch/powerpc/kernel/head_booke.h
@@ -294,13 +294,11 @@ ALT_FTR_SECTION_END_IFSET(CPU_FTR_EMB_HV)
#define EXCEPTION(n, intno, label, hdlr, xfer) \
START_EXCEPTION(label); \
NORMAL_EXCEPTION_PROLOG(intno); \
- addi r3,r1,STACK_FRAME_OVERHEAD; \
xfer(n, hdlr)
#define CRITICAL_EXCEPTION(n, intno, label, hdlr) \
START_EXCEPTION(label); \
CRITICAL_EXCEPTION_PROLOG(intno); \
- addi r3,r1,STACK_FRAME_OVERHEAD; \
SAVE_MMU_REGS; \
SAVE_xSRR SRR; \
EXC_XFER_TEMPLATE(hdlr, n+2, (MSR_KERNEL & ~(MSR_ME|MSR_DE|MSR_CE)), \
@@ -311,7 +309,6 @@ ALT_FTR_SECTION_END_IFSET(CPU_FTR_EMB_HV)
MCHECK_EXCEPTION_PROLOG; \
mfspr r5,SPRN_ESR; \
stw r5,_ESR(r11); \
- addi r3,r1,STACK_FRAME_OVERHEAD; \
SAVE_xSRR DSRR; \
SAVE_xSRR CSRR; \
SAVE_MMU_REGS; \
@@ -398,7 +395,6 @@ ALT_FTR_SECTION_END_IFSET(CPU_FTR_EMB_HV)
/* continue normal handling for a debug exception... */ \
2: mfspr r4,SPRN_DBSR; \
stw r4,_ESR(r11); /* DebugException takes DBSR in _ESR */\
- addi r3,r1,STACK_FRAME_OVERHEAD; \
SAVE_xSRR CSRR; \
SAVE_MMU_REGS; \
SAVE_xSRR SRR; \
@@ -455,7 +451,6 @@ ALT_FTR_SECTION_END_IFSET(CPU_FTR_EMB_HV)
/* continue normal handling for a critical exception... */ \
2: mfspr r4,SPRN_DBSR; \
stw r4,_ESR(r11); /* DebugException takes DBSR in _ESR */\
- addi r3,r1,STACK_FRAME_OVERHEAD; \
SAVE_MMU_REGS; \
SAVE_xSRR SRR; \
EXC_XFER_TEMPLATE(DebugException, 0x2002, (MSR_KERNEL & ~(MSR_ME|MSR_DE|MSR_CE)), crit_transfer_to_handler, ret_from_crit_exc)
@@ -482,7 +477,6 @@ ALT_FTR_SECTION_END_IFSET(CPU_FTR_EMB_HV)
NORMAL_EXCEPTION_PROLOG(ALIGNMENT); \
mfspr r4,SPRN_DEAR; /* Grab the DEAR and save it */ \
stw r4,_DEAR(r11); \
- addi r3,r1,STACK_FRAME_OVERHEAD; \
EXC_XFER_STD(0x0600, alignment_exception)
#define PROGRAM_EXCEPTION \
@@ -490,7 +484,6 @@ ALT_FTR_SECTION_END_IFSET(CPU_FTR_EMB_HV)
NORMAL_EXCEPTION_PROLOG(PROGRAM); \
mfspr r4,SPRN_ESR; /* Grab the ESR and save it */ \
stw r4,_ESR(r11); \
- addi r3,r1,STACK_FRAME_OVERHEAD; \
EXC_XFER_STD(0x0700, program_check_exception)
#define DECREMENTER_EXCEPTION \
@@ -498,7 +491,6 @@ ALT_FTR_SECTION_END_IFSET(CPU_FTR_EMB_HV)
NORMAL_EXCEPTION_PROLOG(DECREMENTER); \
lis r0,TSR_DIS@h; /* Setup the DEC interrupt mask */ \
mtspr SPRN_TSR,r0; /* Clear the DEC interrupt */ \
- addi r3,r1,STACK_FRAME_OVERHEAD; \
EXC_XFER_LITE(0x0900, timer_interrupt)
#define FP_UNAVAILABLE_EXCEPTION \
@@ -507,8 +499,7 @@ ALT_FTR_SECTION_END_IFSET(CPU_FTR_EMB_HV)
beq 1f; \
bl load_up_fpu; /* if from user, just load it up */ \
b fast_exception_return; \
-1: addi r3,r1,STACK_FRAME_OVERHEAD; \
- EXC_XFER_STD(0x800, kernel_fp_unavailable_exception)
+1: EXC_XFER_STD(0x800, kernel_fp_unavailable_exception)
#else /* __ASSEMBLY__ */
struct exception_regs {
diff --git a/arch/powerpc/kernel/head_fsl_booke.S b/arch/powerpc/kernel/head_fsl_booke.S
index 3f4a40cccef5..f51c66f747ad 100644
--- a/arch/powerpc/kernel/head_fsl_booke.S
+++ b/arch/powerpc/kernel/head_fsl_booke.S
@@ -372,7 +372,6 @@ interrupt_base:
bne 1f
EXC_XFER_LITE(0x0300, handle_page_fault)
1:
- addi r3,r1,STACK_FRAME_OVERHEAD
EXC_XFER_LITE(0x0300, CacheLockingException)
/* Instruction Storage Interrupt */
@@ -618,8 +617,7 @@ END_BTB_FLUSH_SECTION
beq 1f
bl load_up_spe
b fast_exception_return
-1: addi r3,r1,STACK_FRAME_OVERHEAD
- EXC_XFER_LITE(0x2010, KernelSPE)
+1: EXC_XFER_LITE(0x2010, KernelSPE)
#elif defined(CONFIG_SPE_POSSIBLE)
EXCEPTION(0x2020, SPE_UNAVAIL, SPEUnavailable, \
unknown_exception, EXC_XFER_STD)
--
2.25.0
^ permalink raw reply related
* [RFC PATCH v1 26/41] powerpc/32: Remove handle_page_fault()
From: Christophe Leroy @ 2021-02-09 9:56 UTC (permalink / raw)
To: Benjamin Herrenschmidt, Paul Mackerras, Michael Ellerman, npiggin
Cc: linuxppc-dev, linux-kernel
In-Reply-To: <cover.1612864003.git.christophe.leroy@csgroup.eu>
Now that non volatile registers are saved at all time, no
need to split bad_page_fault() out of do_page_fault().
Remove handle_page_fault() and use do_page_fault() directly.
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
---
arch/powerpc/kernel/entry_32.S | 16 ----------------
arch/powerpc/kernel/head_40x.S | 4 ++--
arch/powerpc/kernel/head_8xx.S | 4 ++--
arch/powerpc/kernel/head_book3s_32.S | 4 ++--
arch/powerpc/kernel/head_booke.h | 4 ++--
arch/powerpc/kernel/head_fsl_booke.S | 2 +-
arch/powerpc/mm/fault.c | 4 ++--
7 files changed, 11 insertions(+), 27 deletions(-)
diff --git a/arch/powerpc/kernel/entry_32.S b/arch/powerpc/kernel/entry_32.S
index 0b4fdc930aa5..890a4508c1f1 100644
--- a/arch/powerpc/kernel/entry_32.S
+++ b/arch/powerpc/kernel/entry_32.S
@@ -220,22 +220,6 @@ ret_from_kernel_thread:
li r3,0
b ret_from_syscall
-/*
- * Top-level page fault handling.
- * This is in assembler because if do_page_fault tells us that
- * it is a bad kernel page fault, we want to save the non-volatile
- * registers before calling bad_page_fault.
- */
- .globl handle_page_fault
-handle_page_fault:
- bl do_page_fault
- cmpwi r3,0
- beq+ ret_from_except
- mr r4,r3 /* err arg for bad_page_fault */
- addi r3,r1,STACK_FRAME_OVERHEAD
- bl __bad_page_fault
- b ret_from_except_full
-
/*
* This routine switches between two different tasks. The process
* state of one is saved on its kernel stack. Then the state
diff --git a/arch/powerpc/kernel/head_40x.S b/arch/powerpc/kernel/head_40x.S
index 08563d4170c6..a65778380704 100644
--- a/arch/powerpc/kernel/head_40x.S
+++ b/arch/powerpc/kernel/head_40x.S
@@ -207,7 +207,7 @@ _ASM_NOKPROBE_SYMBOL(\name\()_virt)
*/
START_EXCEPTION(0x0300, DataStorage)
EXCEPTION_PROLOG DataStorage handle_dar_dsisr=1
- EXC_XFER_LITE(0x300, handle_page_fault)
+ EXC_XFER_LITE(0x300, do_page_fault)
/*
* 0x0400 - Instruction Storage Exception
@@ -218,7 +218,7 @@ _ASM_NOKPROBE_SYMBOL(\name\()_virt)
li r5,0
stw r5, _ESR(r11) /* Zero ESR */
stw r12, _DEAR(r11) /* SRR0 as DEAR */
- EXC_XFER_LITE(0x400, handle_page_fault)
+ EXC_XFER_LITE(0x400, do_page_fault)
/* 0x0500 - External Interrupt Exception */
EXCEPTION(0x0500, HardwareInterrupt, do_IRQ, EXC_XFER_LITE)
diff --git a/arch/powerpc/kernel/head_8xx.S b/arch/powerpc/kernel/head_8xx.S
index eb1d40a8f2c4..4078d0dc2f18 100644
--- a/arch/powerpc/kernel/head_8xx.S
+++ b/arch/powerpc/kernel/head_8xx.S
@@ -301,7 +301,7 @@ instruction_counter:
.Litlbie:
stw r12, _DAR(r11)
stw r5, _DSISR(r11)
- EXC_XFER_LITE(0x400, handle_page_fault)
+ EXC_XFER_LITE(0x400, do_page_fault)
/* This is the data TLB error on the MPC8xx. This could be due to
* many reasons, including a dirty update to a pte. We bail out to
@@ -322,7 +322,7 @@ DARFixed:/* Return from dcbx instruction bug workaround */
tlbie r4
.Ldtlbie:
/* 0x300 is DataAccess exception, needed by bad_page_fault() */
- EXC_XFER_LITE(0x300, handle_page_fault)
+ EXC_XFER_LITE(0x300, do_page_fault)
#ifdef CONFIG_VMAP_STACK
vmap_stack_overflow_exception
diff --git a/arch/powerpc/kernel/head_book3s_32.S b/arch/powerpc/kernel/head_book3s_32.S
index 626e9fbac2cc..81a6ec098dd1 100644
--- a/arch/powerpc/kernel/head_book3s_32.S
+++ b/arch/powerpc/kernel/head_book3s_32.S
@@ -299,7 +299,7 @@ ALT_MMU_FTR_SECTION_END_IFSET(MMU_FTR_HPTE_TABLE)
lwz r5, _DSISR(r11)
andis. r0, r5, DSISR_DABRMATCH@h
bne- 1f
- EXC_XFER_LITE(0x300, handle_page_fault)
+ EXC_XFER_LITE(0x300, do_page_fault)
1: EXC_XFER_STD(0x300, do_break)
@@ -328,7 +328,7 @@ END_MMU_FTR_SECTION_IFSET(MMU_FTR_HPTE_TABLE)
andis. r5,r9,DSISR_SRR1_MATCH_32S@h /* Filter relevant SRR1 bits */
stw r5, _DSISR(r11)
stw r12, _DAR(r11)
- EXC_XFER_LITE(0x400, handle_page_fault)
+ EXC_XFER_LITE(0x400, do_page_fault)
/* External interrupt */
EXCEPTION(0x500, HardwareInterrupt, do_IRQ, EXC_XFER_LITE)
diff --git a/arch/powerpc/kernel/head_booke.h b/arch/powerpc/kernel/head_booke.h
index 740ddf506efc..9e7b0192bba7 100644
--- a/arch/powerpc/kernel/head_booke.h
+++ b/arch/powerpc/kernel/head_booke.h
@@ -462,7 +462,7 @@ ALT_FTR_SECTION_END_IFSET(CPU_FTR_EMB_HV)
stw r5,_ESR(r11); \
mfspr r4,SPRN_DEAR; /* Grab the DEAR */ \
stw r4, _DEAR(r11); \
- EXC_XFER_LITE(0x0300, handle_page_fault)
+ EXC_XFER_LITE(0x0300, do_page_fault)
#define INSTRUCTION_STORAGE_EXCEPTION \
START_EXCEPTION(InstructionStorage) \
@@ -470,7 +470,7 @@ ALT_FTR_SECTION_END_IFSET(CPU_FTR_EMB_HV)
mfspr r5,SPRN_ESR; /* Grab the ESR and save it */ \
stw r5,_ESR(r11); \
stw r12, _DEAR(r11); /* Pass SRR0 as arg2 */ \
- EXC_XFER_LITE(0x0400, handle_page_fault)
+ EXC_XFER_LITE(0x0400, do_page_fault)
#define ALIGNMENT_EXCEPTION \
START_EXCEPTION(Alignment) \
diff --git a/arch/powerpc/kernel/head_fsl_booke.S b/arch/powerpc/kernel/head_fsl_booke.S
index f51c66f747ad..72e9aa45b99b 100644
--- a/arch/powerpc/kernel/head_fsl_booke.S
+++ b/arch/powerpc/kernel/head_fsl_booke.S
@@ -370,7 +370,7 @@ interrupt_base:
stw r4, _DEAR(r11)
andis. r10,r5,(ESR_ILK|ESR_DLK)@h
bne 1f
- EXC_XFER_LITE(0x0300, handle_page_fault)
+ EXC_XFER_LITE(0x0300, do_page_fault)
1:
EXC_XFER_LITE(0x0300, CacheLockingException)
diff --git a/arch/powerpc/mm/fault.c b/arch/powerpc/mm/fault.c
index b26a7643fc6e..3bbdc06cb414 100644
--- a/arch/powerpc/mm/fault.c
+++ b/arch/powerpc/mm/fault.c
@@ -552,11 +552,11 @@ static long __do_page_fault(struct pt_regs *regs)
if (likely(entry)) {
instruction_pointer_set(regs, extable_fixup(entry));
return 0;
- } else if (IS_ENABLED(CONFIG_PPC_BOOK3S_64)) {
+ } else if (!IS_ENABLED(CONFIG_PPC_BOOK3E_64)) {
__bad_page_fault(regs, err);
return 0;
} else {
- /* 32 and 64e handle the bad page fault in asm */
+ /* 64e handle the bad page fault in asm */
return err;
}
}
--
2.25.0
^ permalink raw reply related
* [RFC PATCH v1 27/41] powerpc/32: Save trap number on stack in exception prolog
From: Christophe Leroy @ 2021-02-09 9:56 UTC (permalink / raw)
To: Benjamin Herrenschmidt, Paul Mackerras, Michael Ellerman, npiggin
Cc: linuxppc-dev, linux-kernel
In-Reply-To: <cover.1612864003.git.christophe.leroy@csgroup.eu>
Saving the trap number into the stack goes into
the exception prolog, as EXC_XFER_xxx will soon disappear.
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
---
arch/powerpc/kernel/head_32.h | 14 ++++-----
arch/powerpc/kernel/head_40x.S | 22 +++++++-------
arch/powerpc/kernel/head_8xx.S | 14 ++++-----
arch/powerpc/kernel/head_book3s_32.S | 14 ++++-----
arch/powerpc/kernel/head_booke.h | 44 +++++++++++++++-------------
arch/powerpc/kernel/head_fsl_booke.S | 4 +--
6 files changed, 58 insertions(+), 54 deletions(-)
diff --git a/arch/powerpc/kernel/head_32.h b/arch/powerpc/kernel/head_32.h
index 4d638d760a96..bf4c288173ad 100644
--- a/arch/powerpc/kernel/head_32.h
+++ b/arch/powerpc/kernel/head_32.h
@@ -10,10 +10,10 @@
* We assume sprg3 has the physical address of the current
* task's thread_struct.
*/
-.macro EXCEPTION_PROLOG name handle_dar_dsisr=0
+.macro EXCEPTION_PROLOG trapno name handle_dar_dsisr=0
EXCEPTION_PROLOG_0 handle_dar_dsisr=\handle_dar_dsisr
EXCEPTION_PROLOG_1
- EXCEPTION_PROLOG_2 \name handle_dar_dsisr=\handle_dar_dsisr
+ EXCEPTION_PROLOG_2 \trapno \name handle_dar_dsisr=\handle_dar_dsisr
.endm
.macro EXCEPTION_PROLOG_0 handle_dar_dsisr=0
@@ -56,7 +56,7 @@
#endif
.endm
-.macro EXCEPTION_PROLOG_2 name handle_dar_dsisr=0
+.macro EXCEPTION_PROLOG_2 trapno name handle_dar_dsisr=0
#ifdef CONFIG_PPC_8xx
.if \handle_dar_dsisr
li r11, RPN_PATTERN
@@ -108,6 +108,8 @@
lis r10,STACK_FRAME_REGS_MARKER@ha /* exception frame marker */
addi r10,r10,STACK_FRAME_REGS_MARKER@l
stw r10,8(r11)
+ li r10, \trapno
+ stw r10,_TRAP(r11)
SAVE_4GPRS(3, r11)
SAVE_2GPRS(7, r11)
_ASM_NOKPROBE_SYMBOL(\name\()_virt)
@@ -182,12 +184,10 @@ _ASM_NOKPROBE_SYMBOL(\name\()_virt)
#define EXCEPTION(n, label, hdlr, xfer) \
START_EXCEPTION(n, label) \
- EXCEPTION_PROLOG label; \
+ EXCEPTION_PROLOG n label; \
xfer(n, hdlr)
#define EXC_XFER_TEMPLATE(hdlr, trap, msr, tfer, ret) \
- li r10,trap; \
- stw r10,_TRAP(r11); \
bl tfer; \
bl hdlr; \
b ret
@@ -213,7 +213,7 @@ _ASM_NOKPROBE_SYMBOL(\name\()_virt)
#endif
lwz r1, emergency_ctx@l(r1)
addi r1, r1, THREAD_SIZE - INT_FRAME_SIZE
- EXCEPTION_PROLOG_2 vmap_stack_overflow
+ EXCEPTION_PROLOG_2 0 vmap_stack_overflow
EXC_XFER_STD(0, stack_overflow_exception)
.endm
diff --git a/arch/powerpc/kernel/head_40x.S b/arch/powerpc/kernel/head_40x.S
index a65778380704..7270caff665c 100644
--- a/arch/powerpc/kernel/head_40x.S
+++ b/arch/powerpc/kernel/head_40x.S
@@ -104,7 +104,7 @@ _ENTRY(crit_esr)
* Instead we use a couple of words of memory at low physical addresses.
* This is OK since we don't support SMP on these processors.
*/
-.macro CRITICAL_EXCEPTION_PROLOG name
+.macro CRITICAL_EXCEPTION_PROLOG trapno name
stw r10,crit_r10@l(0) /* save two registers to work with */
stw r11,crit_r11@l(0)
mfspr r10,SPRN_SRR0
@@ -161,6 +161,8 @@ _ENTRY(crit_esr)
lis r10, STACK_FRAME_REGS_MARKER@ha /* exception frame marker */
addi r10, r10, STACK_FRAME_REGS_MARKER@l
stw r10, 8(r11)
+ li r10, \trapno + 2
+ stw r10,_TRAP(r11)
SAVE_4GPRS(3, r11)
SAVE_2GPRS(7, r11)
_ASM_NOKPROBE_SYMBOL(\name\()_virt)
@@ -184,7 +186,7 @@ _ASM_NOKPROBE_SYMBOL(\name\()_virt)
*/
#define CRITICAL_EXCEPTION(n, label, hdlr) \
START_EXCEPTION(n, label); \
- CRITICAL_EXCEPTION_PROLOG label; \
+ CRITICAL_EXCEPTION_PROLOG n label; \
EXC_XFER_TEMPLATE(hdlr, n+2, (MSR_KERNEL & ~(MSR_ME|MSR_DE|MSR_CE)), \
crit_transfer_to_handler, ret_from_crit_exc)
@@ -206,7 +208,7 @@ _ASM_NOKPROBE_SYMBOL(\name\()_virt)
* if they can't resolve the lightweight TLB fault.
*/
START_EXCEPTION(0x0300, DataStorage)
- EXCEPTION_PROLOG DataStorage handle_dar_dsisr=1
+ EXCEPTION_PROLOG 0x300 DataStorage handle_dar_dsisr=1
EXC_XFER_LITE(0x300, do_page_fault)
/*
@@ -214,7 +216,7 @@ _ASM_NOKPROBE_SYMBOL(\name\()_virt)
* This is caused by a fetch from non-execute or guarded pages.
*/
START_EXCEPTION(0x0400, InstructionAccess)
- EXCEPTION_PROLOG InstructionAccess
+ EXCEPTION_PROLOG 0x400 InstructionAccess
li r5,0
stw r5, _ESR(r11) /* Zero ESR */
stw r12, _DEAR(r11) /* SRR0 as DEAR */
@@ -225,12 +227,12 @@ _ASM_NOKPROBE_SYMBOL(\name\()_virt)
/* 0x0600 - Alignment Exception */
START_EXCEPTION(0x0600, Alignment)
- EXCEPTION_PROLOG Alignment handle_dar_dsisr=1
+ EXCEPTION_PROLOG 0x600 Alignment handle_dar_dsisr=1
EXC_XFER_STD(0x600, alignment_exception)
/* 0x0700 - Program Exception */
START_EXCEPTION(0x0700, ProgramCheck)
- EXCEPTION_PROLOG ProgramCheck handle_dar_dsisr=1
+ EXCEPTION_PROLOG 0x700 ProgramCheck handle_dar_dsisr=1
EXC_XFER_STD(0x700, program_check_exception)
EXCEPTION(0x0800, Trap_08, unknown_exception, EXC_XFER_STD)
@@ -449,7 +451,7 @@ _ASM_NOKPROBE_SYMBOL(\name\()_virt)
*/
/* 0x2000 - Debug Exception */
START_EXCEPTION(0x2000, DebugTrap)
- CRITICAL_EXCEPTION_PROLOG DebugTrap
+ CRITICAL_EXCEPTION_PROLOG 0x2000 DebugTrap
/*
* If this is a single step or branch-taken exception in an
@@ -498,7 +500,7 @@ _ASM_NOKPROBE_SYMBOL(\name\()_virt)
/* Programmable Interval Timer (PIT) Exception. (from 0x1000) */
__HEAD
Decrementer:
- EXCEPTION_PROLOG Decrementer
+ EXCEPTION_PROLOG 0x1000 Decrementer
lis r0,TSR_PIS@h
mtspr SPRN_TSR,r0 /* Clear the PIT exception */
EXC_XFER_LITE(0x1000, timer_interrupt)
@@ -506,13 +508,13 @@ Decrementer:
/* Fixed Interval Timer (FIT) Exception. (from 0x1010) */
__HEAD
FITException:
- EXCEPTION_PROLOG FITException
+ EXCEPTION_PROLOG 0x1010 FITException
EXC_XFER_STD(0x1010, unknown_exception)
/* Watchdog Timer (WDT) Exception. (from 0x1020) */
__HEAD
WDTException:
- CRITICAL_EXCEPTION_PROLOG WDTException
+ CRITICAL_EXCEPTION_PROLOG 0x1020 WDTException
EXC_XFER_TEMPLATE(WatchdogException, 0x1020+2,
(MSR_KERNEL & ~(MSR_ME|MSR_DE|MSR_CE)),
crit_transfer_to_handler, ret_from_crit_exc)
diff --git a/arch/powerpc/kernel/head_8xx.S b/arch/powerpc/kernel/head_8xx.S
index 4078d0dc2f18..c48de97f42fc 100644
--- a/arch/powerpc/kernel/head_8xx.S
+++ b/arch/powerpc/kernel/head_8xx.S
@@ -122,7 +122,7 @@ instruction_counter:
/* Machine check */
START_EXCEPTION(0x200, MachineCheck)
- EXCEPTION_PROLOG MachineCheck handle_dar_dsisr=1
+ EXCEPTION_PROLOG 0x200 MachineCheck handle_dar_dsisr=1
EXC_XFER_STD(0x200, machine_check_exception)
/* External interrupt */
@@ -130,7 +130,7 @@ instruction_counter:
/* Alignment exception */
START_EXCEPTION(0x600, Alignment)
- EXCEPTION_PROLOG Alignment handle_dar_dsisr=1
+ EXCEPTION_PROLOG 0x600 Alignment handle_dar_dsisr=1
EXC_XFER_STD(0x600, alignment_exception)
/* Program check exception */
@@ -292,12 +292,12 @@ instruction_counter:
* addresses. There is nothing to do but handle a big time error fault.
*/
START_EXCEPTION(0x1300, InstructionTLBError)
- EXCEPTION_PROLOG InstructionTLBError
+ /* 0x400 is InstructionAccess exception, needed by bad_page_fault() */
+ EXCEPTION_PROLOG 0x400 InstructionTLBError
andis. r5,r9,DSISR_SRR1_MATCH_32S@h /* Filter relevant SRR1 bits */
andis. r10,r9,SRR1_ISI_NOPT@h
beq+ .Litlbie
tlbie r12
- /* 0x400 is InstructionAccess exception, needed by bad_page_fault() */
.Litlbie:
stw r12, _DAR(r11)
stw r5, _DSISR(r11)
@@ -314,14 +314,14 @@ instruction_counter:
beq- cr1, FixupDAR /* must be a buggy dcbX, icbi insn. */
DARFixed:/* Return from dcbx instruction bug workaround */
EXCEPTION_PROLOG_1
- EXCEPTION_PROLOG_2 DataTLBError handle_dar_dsisr=1
+ /* 0x300 is DataAccess exception, needed by bad_page_fault() */
+ EXCEPTION_PROLOG_2 0x300 DataTLBError handle_dar_dsisr=1
lwz r4, _DAR(r11)
lwz r5, _DSISR(r11)
andis. r10,r5,DSISR_NOHPTE@h
beq+ .Ldtlbie
tlbie r4
.Ldtlbie:
- /* 0x300 is DataAccess exception, needed by bad_page_fault() */
EXC_XFER_LITE(0x300, do_page_fault)
#ifdef CONFIG_VMAP_STACK
@@ -345,7 +345,7 @@ DARFixed:/* Return from dcbx instruction bug workaround */
rfi
1: EXCEPTION_PROLOG_1
- EXCEPTION_PROLOG_2 DataBreakpoint handle_dar_dsisr=1
+ EXCEPTION_PROLOG_2 0x1c00 DataBreakpoint handle_dar_dsisr=1
mfspr r4,SPRN_BAR
stw r4,_DAR(r11)
EXC_XFER_STD(0x1c00, do_break)
diff --git a/arch/powerpc/kernel/head_book3s_32.S b/arch/powerpc/kernel/head_book3s_32.S
index 81a6ec098dd1..67dac65b8ec3 100644
--- a/arch/powerpc/kernel/head_book3s_32.S
+++ b/arch/powerpc/kernel/head_book3s_32.S
@@ -266,7 +266,7 @@ __secondary_hold_acknowledge:
mfspr r1, SPRN_SPRG_SCRATCH2
#endif /* CONFIG_PPC_CHRP */
EXCEPTION_PROLOG_1
-7: EXCEPTION_PROLOG_2 MachineCheck
+7: EXCEPTION_PROLOG_2 0x200 MachineCheck
#ifdef CONFIG_PPC_CHRP
beq cr1, 1f
twi 31, 0, 0
@@ -295,7 +295,7 @@ ALT_MMU_FTR_SECTION_END_IFSET(MMU_FTR_HPTE_TABLE)
#endif
1: EXCEPTION_PROLOG_0 handle_dar_dsisr=1
EXCEPTION_PROLOG_1
- EXCEPTION_PROLOG_2 DataAccess handle_dar_dsisr=1
+ EXCEPTION_PROLOG_2 0x300 DataAccess handle_dar_dsisr=1
lwz r5, _DSISR(r11)
andis. r0, r5, DSISR_DABRMATCH@h
bne- 1f
@@ -324,7 +324,7 @@ END_MMU_FTR_SECTION_IFSET(MMU_FTR_HPTE_TABLE)
andi. r11, r11, MSR_PR
EXCEPTION_PROLOG_1
- EXCEPTION_PROLOG_2 InstructionAccess
+ EXCEPTION_PROLOG_2 0x400 InstructionAccess
andis. r5,r9,DSISR_SRR1_MATCH_32S@h /* Filter relevant SRR1 bits */
stw r5, _DSISR(r11)
stw r12, _DAR(r11)
@@ -335,7 +335,7 @@ END_MMU_FTR_SECTION_IFSET(MMU_FTR_HPTE_TABLE)
/* Alignment exception */
START_EXCEPTION(0x600, Alignment)
- EXCEPTION_PROLOG Alignment handle_dar_dsisr=1
+ EXCEPTION_PROLOG 0x600 Alignment handle_dar_dsisr=1
EXC_XFER_STD(0x600, alignment_exception)
/* Program check exception */
@@ -351,7 +351,7 @@ BEGIN_FTR_SECTION
*/
b ProgramCheck
END_FTR_SECTION_IFSET(CPU_FTR_FPU_UNAVAILABLE)
- EXCEPTION_PROLOG FPUnavailable
+ EXCEPTION_PROLOG 0x800 FPUnavailable
beq 1f
bl load_up_fpu /* if from user, just load it up */
b fast_exception_return
@@ -710,7 +710,7 @@ fast_hash_page_return:
__HEAD
AltiVecUnavailable:
- EXCEPTION_PROLOG AltiVecUnavailable
+ EXCEPTION_PROLOG 0xf20 AltiVecUnavailable
#ifdef CONFIG_ALTIVEC
beq 1f
bl load_up_altivec /* if from user, just load it up */
@@ -720,7 +720,7 @@ AltiVecUnavailable:
__HEAD
PerformanceMonitor:
- EXCEPTION_PROLOG PerformanceMonitor
+ EXCEPTION_PROLOG 0xf00 PerformanceMonitor
EXC_XFER_STD(0xf00, performance_monitor_exception)
diff --git a/arch/powerpc/kernel/head_booke.h b/arch/powerpc/kernel/head_booke.h
index 9e7b0192bba7..12add20edbb1 100644
--- a/arch/powerpc/kernel/head_booke.h
+++ b/arch/powerpc/kernel/head_booke.h
@@ -44,7 +44,7 @@ END_BTB_FLUSH_SECTION
#endif
-#define NORMAL_EXCEPTION_PROLOG(intno) \
+#define NORMAL_EXCEPTION_PROLOG(trapno, intno) \
mtspr SPRN_SPRG_WSCRATCH0, r10; /* save one register */ \
mfspr r10, SPRN_SPRG_THREAD; \
stw r11, THREAD_NORMSAVE(0)(r10); \
@@ -82,6 +82,8 @@ END_BTB_FLUSH_SECTION
lis r10, STACK_FRAME_REGS_MARKER@ha;/* exception frame marker */ \
addi r10, r10, STACK_FRAME_REGS_MARKER@l; \
stw r10, 8(r11); \
+ li r10, trapno; \
+ stw r10,_TRAP(r11); \
SAVE_4GPRS(3, r11); \
SAVE_2GPRS(7, r11)
@@ -182,7 +184,7 @@ ALT_FTR_SECTION_END_IFSET(CPU_FTR_EMB_HV)
* registers as the normal prolog above. Instead we use a portion of the
* critical/machine check exception stack at low physical addresses.
*/
-#define EXC_LEVEL_EXCEPTION_PROLOG(exc_level, intno, exc_level_srr0, exc_level_srr1) \
+#define EXC_LEVEL_EXCEPTION_PROLOG(exc_level, trapno, intno, exc_level_srr0, exc_level_srr1) \
mtspr SPRN_SPRG_WSCRATCH_##exc_level,r8; \
BOOKE_LOAD_EXC_LEVEL_STACK(exc_level);/* r8 points to the exc_level stack*/ \
stw r9,GPR9(r8); /* save various registers */\
@@ -225,6 +227,8 @@ ALT_FTR_SECTION_END_IFSET(CPU_FTR_EMB_HV)
stw r1,0(r11); \
mr r1,r11; \
rlwinm r9,r9,0,14,12; /* clear MSR_WE (necessary?) */\
+ li r10, trapno; \
+ stw r10,_TRAP(r11); \
stw r0,GPR0(r11); \
SAVE_4GPRS(3, r11); \
SAVE_2GPRS(7, r11)
@@ -259,12 +263,12 @@ ALT_FTR_SECTION_END_IFSET(CPU_FTR_EMB_HV)
#endif
.endm
-#define CRITICAL_EXCEPTION_PROLOG(intno) \
- EXC_LEVEL_EXCEPTION_PROLOG(CRIT, intno, SPRN_CSRR0, SPRN_CSRR1)
-#define DEBUG_EXCEPTION_PROLOG \
- EXC_LEVEL_EXCEPTION_PROLOG(DBG, DEBUG, SPRN_DSRR0, SPRN_DSRR1)
-#define MCHECK_EXCEPTION_PROLOG \
- EXC_LEVEL_EXCEPTION_PROLOG(MC, MACHINE_CHECK, \
+#define CRITICAL_EXCEPTION_PROLOG(trapno, intno) \
+ EXC_LEVEL_EXCEPTION_PROLOG(CRIT, trapno+2, intno, SPRN_CSRR0, SPRN_CSRR1)
+#define DEBUG_EXCEPTION_PROLOG(trapno) \
+ EXC_LEVEL_EXCEPTION_PROLOG(DBG, trapno+8, DEBUG, SPRN_DSRR0, SPRN_DSRR1)
+#define MCHECK_EXCEPTION_PROLOG(trapno) \
+ EXC_LEVEL_EXCEPTION_PROLOG(MC, trapno+4, MACHINE_CHECK, \
SPRN_MCSRR0, SPRN_MCSRR1)
/*
@@ -293,12 +297,12 @@ ALT_FTR_SECTION_END_IFSET(CPU_FTR_EMB_HV)
#define EXCEPTION(n, intno, label, hdlr, xfer) \
START_EXCEPTION(label); \
- NORMAL_EXCEPTION_PROLOG(intno); \
+ NORMAL_EXCEPTION_PROLOG(n, intno); \
xfer(n, hdlr)
#define CRITICAL_EXCEPTION(n, intno, label, hdlr) \
START_EXCEPTION(label); \
- CRITICAL_EXCEPTION_PROLOG(intno); \
+ CRITICAL_EXCEPTION_PROLOG(n, intno); \
SAVE_MMU_REGS; \
SAVE_xSRR SRR; \
EXC_XFER_TEMPLATE(hdlr, n+2, (MSR_KERNEL & ~(MSR_ME|MSR_DE|MSR_CE)), \
@@ -306,7 +310,7 @@ ALT_FTR_SECTION_END_IFSET(CPU_FTR_EMB_HV)
#define MCHECK_EXCEPTION(n, label, hdlr) \
START_EXCEPTION(label); \
- MCHECK_EXCEPTION_PROLOG; \
+ MCHECK_EXCEPTION_PROLOG(n); \
mfspr r5,SPRN_ESR; \
stw r5,_ESR(r11); \
SAVE_xSRR DSRR; \
@@ -317,8 +321,6 @@ ALT_FTR_SECTION_END_IFSET(CPU_FTR_EMB_HV)
mcheck_transfer_to_handler, ret_from_mcheck_exc)
#define EXC_XFER_TEMPLATE(hdlr, trap, msr, tfer, ret) \
- li r10,trap; \
- stw r10,_TRAP(r11); \
bl tfer; \
bl hdlr; \
b ret; \
@@ -346,7 +348,7 @@ ALT_FTR_SECTION_END_IFSET(CPU_FTR_EMB_HV)
*/
#define DEBUG_DEBUG_EXCEPTION \
START_EXCEPTION(DebugDebug); \
- DEBUG_EXCEPTION_PROLOG; \
+ DEBUG_EXCEPTION_PROLOG(2000); \
\
/* \
* If there is a single step or branch-taken exception in an \
@@ -402,7 +404,7 @@ ALT_FTR_SECTION_END_IFSET(CPU_FTR_EMB_HV)
#define DEBUG_CRIT_EXCEPTION \
START_EXCEPTION(DebugCrit); \
- CRITICAL_EXCEPTION_PROLOG(DEBUG); \
+ CRITICAL_EXCEPTION_PROLOG(2000,DEBUG); \
\
/* \
* If there is a single step or branch-taken exception in an \
@@ -457,7 +459,7 @@ ALT_FTR_SECTION_END_IFSET(CPU_FTR_EMB_HV)
#define DATA_STORAGE_EXCEPTION \
START_EXCEPTION(DataStorage) \
- NORMAL_EXCEPTION_PROLOG(DATA_STORAGE); \
+ NORMAL_EXCEPTION_PROLOG(0x300, DATA_STORAGE); \
mfspr r5,SPRN_ESR; /* Grab the ESR and save it */ \
stw r5,_ESR(r11); \
mfspr r4,SPRN_DEAR; /* Grab the DEAR */ \
@@ -466,7 +468,7 @@ ALT_FTR_SECTION_END_IFSET(CPU_FTR_EMB_HV)
#define INSTRUCTION_STORAGE_EXCEPTION \
START_EXCEPTION(InstructionStorage) \
- NORMAL_EXCEPTION_PROLOG(INST_STORAGE); \
+ NORMAL_EXCEPTION_PROLOG(0x400, INST_STORAGE); \
mfspr r5,SPRN_ESR; /* Grab the ESR and save it */ \
stw r5,_ESR(r11); \
stw r12, _DEAR(r11); /* Pass SRR0 as arg2 */ \
@@ -474,28 +476,28 @@ ALT_FTR_SECTION_END_IFSET(CPU_FTR_EMB_HV)
#define ALIGNMENT_EXCEPTION \
START_EXCEPTION(Alignment) \
- NORMAL_EXCEPTION_PROLOG(ALIGNMENT); \
+ NORMAL_EXCEPTION_PROLOG(0x600, ALIGNMENT); \
mfspr r4,SPRN_DEAR; /* Grab the DEAR and save it */ \
stw r4,_DEAR(r11); \
EXC_XFER_STD(0x0600, alignment_exception)
#define PROGRAM_EXCEPTION \
START_EXCEPTION(Program) \
- NORMAL_EXCEPTION_PROLOG(PROGRAM); \
+ NORMAL_EXCEPTION_PROLOG(0x700, PROGRAM); \
mfspr r4,SPRN_ESR; /* Grab the ESR and save it */ \
stw r4,_ESR(r11); \
EXC_XFER_STD(0x0700, program_check_exception)
#define DECREMENTER_EXCEPTION \
START_EXCEPTION(Decrementer) \
- NORMAL_EXCEPTION_PROLOG(DECREMENTER); \
+ NORMAL_EXCEPTION_PROLOG(0x900, DECREMENTER); \
lis r0,TSR_DIS@h; /* Setup the DEC interrupt mask */ \
mtspr SPRN_TSR,r0; /* Clear the DEC interrupt */ \
EXC_XFER_LITE(0x0900, timer_interrupt)
#define FP_UNAVAILABLE_EXCEPTION \
START_EXCEPTION(FloatingPointUnavailable) \
- NORMAL_EXCEPTION_PROLOG(FP_UNAVAIL); \
+ NORMAL_EXCEPTION_PROLOG(0x800, FP_UNAVAIL); \
beq 1f; \
bl load_up_fpu; /* if from user, just load it up */ \
b fast_exception_return; \
diff --git a/arch/powerpc/kernel/head_fsl_booke.S b/arch/powerpc/kernel/head_fsl_booke.S
index 72e9aa45b99b..bf2730b4e43b 100644
--- a/arch/powerpc/kernel/head_fsl_booke.S
+++ b/arch/powerpc/kernel/head_fsl_booke.S
@@ -363,7 +363,7 @@ interrupt_base:
/* Data Storage Interrupt */
START_EXCEPTION(DataStorage)
- NORMAL_EXCEPTION_PROLOG(DATA_STORAGE)
+ NORMAL_EXCEPTION_PROLOG(0x300, DATA_STORAGE)
mfspr r5,SPRN_ESR /* Grab the ESR, save it */
stw r5,_ESR(r11)
mfspr r4,SPRN_DEAR /* Grab the DEAR, save it */
@@ -613,7 +613,7 @@ END_BTB_FLUSH_SECTION
#ifdef CONFIG_SPE
/* SPE Unavailable */
START_EXCEPTION(SPEUnavailable)
- NORMAL_EXCEPTION_PROLOG(SPE_UNAVAIL)
+ NORMAL_EXCEPTION_PROLOG(0x2010, SPE_UNAVAIL)
beq 1f
bl load_up_spe
b fast_exception_return
--
2.25.0
^ permalink raw reply related
* [RFC PATCH v1 28/41] powerpc/32: Add a prepare_transfer_to_handler macro for exception prologs
From: Christophe Leroy @ 2021-02-09 9:56 UTC (permalink / raw)
To: Benjamin Herrenschmidt, Paul Mackerras, Michael Ellerman, npiggin
Cc: linuxppc-dev, linux-kernel
In-Reply-To: <cover.1612864003.git.christophe.leroy@csgroup.eu>
In order to increase flexibility, add a macro that will for now
call transfer_to_handler.
As transfer_to_handler doesn't do the actual transfer anymore,
also name it prepare_transfer_to_handler. The following patches
will progressively remove the use of transfer_to_handler label.
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
---
arch/powerpc/kernel/entry_32.S | 3 +++
arch/powerpc/kernel/head_32.h | 4 ++++
arch/powerpc/kernel/head_booke.h | 4 ++++
3 files changed, 11 insertions(+)
diff --git a/arch/powerpc/kernel/entry_32.S b/arch/powerpc/kernel/entry_32.S
index 890a4508c1f1..03f4d07f4176 100644
--- a/arch/powerpc/kernel/entry_32.S
+++ b/arch/powerpc/kernel/entry_32.S
@@ -86,6 +86,8 @@ _ASM_NOKPROBE_SYMBOL(transfer_to_handler_full)
.globl transfer_to_handler
transfer_to_handler:
+ .globl prepare_transfer_to_handler
+prepare_transfer_to_handler:
SAVE_NVGPRS(r11)
addi r3,r1,STACK_FRAME_OVERHEAD
stw r2,GPR2(r11)
@@ -133,6 +135,7 @@ transfer_to_handler_cont:
stw r9,_MSR(r11)
b fast_exception_return
#endif
+_ASM_NOKPROBE_SYMBOL(prepare_transfer_to_handler)
_ASM_NOKPROBE_SYMBOL(transfer_to_handler)
_ASM_NOKPROBE_SYMBOL(transfer_to_handler_cont)
diff --git a/arch/powerpc/kernel/head_32.h b/arch/powerpc/kernel/head_32.h
index bf4c288173ad..3ab0f3ad9a6a 100644
--- a/arch/powerpc/kernel/head_32.h
+++ b/arch/powerpc/kernel/head_32.h
@@ -115,6 +115,10 @@
_ASM_NOKPROBE_SYMBOL(\name\()_virt)
.endm
+.macro prepare_transfer_to_handler
+ bl prepare_transfer_to_handler
+.endm
+
.macro SYSCALL_ENTRY trapno
mfspr r9, SPRN_SRR1
mfspr r10, SPRN_SRR0
diff --git a/arch/powerpc/kernel/head_booke.h b/arch/powerpc/kernel/head_booke.h
index 12add20edbb1..9bc86aab65ef 100644
--- a/arch/powerpc/kernel/head_booke.h
+++ b/arch/powerpc/kernel/head_booke.h
@@ -87,6 +87,10 @@ END_BTB_FLUSH_SECTION
SAVE_4GPRS(3, r11); \
SAVE_2GPRS(7, r11)
+.macro prepare_transfer_to_handler
+ bl prepare_transfer_to_handler
+.endm
+
.macro SYSCALL_ENTRY trapno intno srr1
mfspr r10, SPRN_SPRG_THREAD
#ifdef CONFIG_KVM_BOOKE_HV
--
2.25.0
^ permalink raw reply related
* [RFC PATCH v1 29/41] powerpc/32: Only restore non volatile registers when required
From: Christophe Leroy @ 2021-02-09 9:56 UTC (permalink / raw)
To: Benjamin Herrenschmidt, Paul Mackerras, Michael Ellerman, npiggin
Cc: linuxppc-dev, linux-kernel
In-Reply-To: <cover.1612864003.git.christophe.leroy@csgroup.eu>
Until now, non volatile registers were restored everytime they
were saved, ie using EXC_XFER_STD meant saving and restoring
them while EXC_XFER_LITE meant neither saving not restoring them.
Now that they are always saved, EXC_XFER_STD means to restore
them and EXC_XFER_LITE means to not restore them.
Most of the users of EXC_XFER_STD only need to retrieve the
non volatile registers. For them there is no need to restore
the non volatile registers as they have not been modified.
Only very few exceptions require non volatile registers restore.
Opencode the few places which require saving of non volatile
registers.
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
---
arch/powerpc/kernel/entry_32.S | 1 -
arch/powerpc/kernel/head_40x.S | 10 ++++++++--
arch/powerpc/kernel/head_8xx.S | 24 ++++++++++++++++++++----
arch/powerpc/kernel/head_book3s_32.S | 17 ++++++++++++++---
arch/powerpc/kernel/head_booke.h | 10 ++++++++--
arch/powerpc/kernel/head_fsl_booke.S | 16 ++++++++++++----
6 files changed, 62 insertions(+), 16 deletions(-)
diff --git a/arch/powerpc/kernel/entry_32.S b/arch/powerpc/kernel/entry_32.S
index 03f4d07f4176..d8a913f850ef 100644
--- a/arch/powerpc/kernel/entry_32.S
+++ b/arch/powerpc/kernel/entry_32.S
@@ -335,7 +335,6 @@ _ASM_NOKPROBE_SYMBOL(fast_exception_return)
.globl ret_from_except_full
ret_from_except_full:
- REST_NVGPRS(r1)
/* fall through */
.globl ret_from_except
diff --git a/arch/powerpc/kernel/head_40x.S b/arch/powerpc/kernel/head_40x.S
index 7270caff665c..f3e5b462113f 100644
--- a/arch/powerpc/kernel/head_40x.S
+++ b/arch/powerpc/kernel/head_40x.S
@@ -228,12 +228,18 @@ _ASM_NOKPROBE_SYMBOL(\name\()_virt)
/* 0x0600 - Alignment Exception */
START_EXCEPTION(0x0600, Alignment)
EXCEPTION_PROLOG 0x600 Alignment handle_dar_dsisr=1
- EXC_XFER_STD(0x600, alignment_exception)
+ prepare_transfer_to_handler
+ bl alignment_exception
+ REST_NVGPRS(r1)
+ b interrupt_return
/* 0x0700 - Program Exception */
START_EXCEPTION(0x0700, ProgramCheck)
EXCEPTION_PROLOG 0x700 ProgramCheck handle_dar_dsisr=1
- EXC_XFER_STD(0x700, program_check_exception)
+ prepare_transfer_to_handler
+ bl program_check_exception
+ REST_NVGPRS(r1)
+ b interrupt_return
EXCEPTION(0x0800, Trap_08, unknown_exception, EXC_XFER_STD)
EXCEPTION(0x0900, Trap_09, unknown_exception, EXC_XFER_STD)
diff --git a/arch/powerpc/kernel/head_8xx.S b/arch/powerpc/kernel/head_8xx.S
index c48de97f42fc..86f844eb0e5a 100644
--- a/arch/powerpc/kernel/head_8xx.S
+++ b/arch/powerpc/kernel/head_8xx.S
@@ -131,10 +131,18 @@ instruction_counter:
/* Alignment exception */
START_EXCEPTION(0x600, Alignment)
EXCEPTION_PROLOG 0x600 Alignment handle_dar_dsisr=1
- EXC_XFER_STD(0x600, alignment_exception)
+ prepare_transfer_to_handler
+ bl alignment_exception
+ REST_NVGPRS(r1)
+ b interrupt_return
/* Program check exception */
- EXCEPTION(0x700, ProgramCheck, program_check_exception, EXC_XFER_STD)
+ START_EXCEPTION(0x700, ProgramCheck)
+ EXCEPTION_PROLOG 0x700 ProgramCheck
+ prepare_transfer_to_handler
+ bl program_check_exception
+ REST_NVGPRS(r1)
+ b interrupt_return
/* Decrementer */
EXCEPTION(0x900, Decrementer, timer_interrupt, EXC_XFER_LITE)
@@ -149,7 +157,12 @@ instruction_counter:
/* On the MPC8xx, this is a software emulation interrupt. It occurs
* for all unimplemented and illegal instructions.
*/
- EXCEPTION(0x1000, SoftEmu, emulation_assist_interrupt, EXC_XFER_STD)
+ START_EXCEPTION(0x1000, SoftEmu)
+ EXCEPTION_PROLOG 0x1000 SoftEmu
+ prepare_transfer_to_handler
+ bl emulation_assist_interrupt
+ REST_NVGPRS(r1)
+ b interrupt_return
/*
* For the MPC8xx, this is a software tablewalk to load the instruction
@@ -348,7 +361,10 @@ DARFixed:/* Return from dcbx instruction bug workaround */
EXCEPTION_PROLOG_2 0x1c00 DataBreakpoint handle_dar_dsisr=1
mfspr r4,SPRN_BAR
stw r4,_DAR(r11)
- EXC_XFER_STD(0x1c00, do_break)
+ prepare_transfer_to_handler
+ bl do_break
+ REST_NVGPRS(r1)
+ b interrupt_return
#ifdef CONFIG_PERF_EVENTS
START_EXCEPTION(0x1d00, InstructionBreakpoint)
diff --git a/arch/powerpc/kernel/head_book3s_32.S b/arch/powerpc/kernel/head_book3s_32.S
index 67dac65b8ec3..609b2eedd4f9 100644
--- a/arch/powerpc/kernel/head_book3s_32.S
+++ b/arch/powerpc/kernel/head_book3s_32.S
@@ -300,7 +300,10 @@ ALT_MMU_FTR_SECTION_END_IFSET(MMU_FTR_HPTE_TABLE)
andis. r0, r5, DSISR_DABRMATCH@h
bne- 1f
EXC_XFER_LITE(0x300, do_page_fault)
-1: EXC_XFER_STD(0x300, do_break)
+1: prepare_transfer_to_handler
+ bl do_break
+ REST_NVGPRS(r1)
+ b interrupt_return
/* Instruction access exception. */
@@ -336,10 +339,18 @@ END_MMU_FTR_SECTION_IFSET(MMU_FTR_HPTE_TABLE)
/* Alignment exception */
START_EXCEPTION(0x600, Alignment)
EXCEPTION_PROLOG 0x600 Alignment handle_dar_dsisr=1
- EXC_XFER_STD(0x600, alignment_exception)
+ prepare_transfer_to_handler
+ bl alignment_exception
+ REST_NVGPRS(r1)
+ b interrupt_return
/* Program check exception */
- EXCEPTION(0x700, ProgramCheck, program_check_exception, EXC_XFER_STD)
+ START_EXCEPTION(0x700, ProgramCheck)
+ EXCEPTION_PROLOG 0x700 ProgramCheck
+ prepare_transfer_to_handler
+ bl program_check_exception
+ REST_NVGPRS(r1)
+ b interrupt_return
/* Floating-point unavailable */
START_EXCEPTION(0x800, FPUnavailable)
diff --git a/arch/powerpc/kernel/head_booke.h b/arch/powerpc/kernel/head_booke.h
index 9bc86aab65ef..809d1c6c9af9 100644
--- a/arch/powerpc/kernel/head_booke.h
+++ b/arch/powerpc/kernel/head_booke.h
@@ -483,14 +483,20 @@ ALT_FTR_SECTION_END_IFSET(CPU_FTR_EMB_HV)
NORMAL_EXCEPTION_PROLOG(0x600, ALIGNMENT); \
mfspr r4,SPRN_DEAR; /* Grab the DEAR and save it */ \
stw r4,_DEAR(r11); \
- EXC_XFER_STD(0x0600, alignment_exception)
+ prepare_transfer_to_handler; \
+ bl alignment_exception; \
+ REST_NVGPRS(r1); \
+ b interrupt_return
#define PROGRAM_EXCEPTION \
START_EXCEPTION(Program) \
NORMAL_EXCEPTION_PROLOG(0x700, PROGRAM); \
mfspr r4,SPRN_ESR; /* Grab the ESR and save it */ \
stw r4,_ESR(r11); \
- EXC_XFER_STD(0x0700, program_check_exception)
+ prepare_transfer_to_handler; \
+ bl program_check_exception; \
+ REST_NVGPRS(r1); \
+ b interrupt_return
#define DECREMENTER_EXCEPTION \
START_EXCEPTION(Decrementer) \
diff --git a/arch/powerpc/kernel/head_fsl_booke.S b/arch/powerpc/kernel/head_fsl_booke.S
index bf2730b4e43b..210871b2eb41 100644
--- a/arch/powerpc/kernel/head_fsl_booke.S
+++ b/arch/powerpc/kernel/head_fsl_booke.S
@@ -625,12 +625,20 @@ END_BTB_FLUSH_SECTION
/* SPE Floating Point Data */
#ifdef CONFIG_SPE
- EXCEPTION(0x2030, SPE_FP_DATA, SPEFloatingPointData,
- SPEFloatingPointException, EXC_XFER_STD)
+ START_EXCEPTION(SPEFloatingPointData)
+ NORMAL_EXCEPTION_PROLOG(0x2030, SPE_FP_DATA)
+ prepare_transfer_to_handler
+ bl SPEFloatingPointException
+ REST_NVGPRS(r1)
+ b interrupt_return
/* SPE Floating Point Round */
- EXCEPTION(0x2050, SPE_FP_ROUND, SPEFloatingPointRound, \
- SPEFloatingPointRoundException, EXC_XFER_STD)
+ START_EXCEPTION(SPEFloatingPointRound)
+ NORMAL_EXCEPTION_PROLOG(0x2050, SPE_FP_ROUND)
+ prepare_transfer_to_handler
+ bl SPEFloatingPointRoundException
+ REST_NVGPRS(r1)
+ b interrupt_return
#elif defined(CONFIG_SPE_POSSIBLE)
EXCEPTION(0x2040, SPE_FP_DATA, SPEFloatingPointData,
unknown_exception, EXC_XFER_STD)
--
2.25.0
^ permalink raw reply related
* [RFC PATCH v1 30/41] powerpc/32: Dismantle EXC_XFER_STD/LITE/TEMPLATE
From: Christophe Leroy @ 2021-02-09 9:56 UTC (permalink / raw)
To: Benjamin Herrenschmidt, Paul Mackerras, Michael Ellerman, npiggin
Cc: linuxppc-dev, linux-kernel
In-Reply-To: <cover.1612864003.git.christophe.leroy@csgroup.eu>
In order to get more control in exception prolog, dismantle
all non standard exception macros, finishing with EXC_XFER_STD
and EXC_XFER_LITE and EXC_XFER_TEMPLATE.
Also remove transfer_to_handler_full and ret_from_except and
ret_from_except_full as they are not used anymore.
Last parameter of EXCEPTION() is now ignored, will be removed
in a later patch to avoid too much churn.
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
---
arch/powerpc/kernel/entry_32.S | 40 -----------------------
arch/powerpc/kernel/head_32.h | 21 ++++--------
arch/powerpc/kernel/head_40x.S | 33 ++++++++++++-------
arch/powerpc/kernel/head_8xx.S | 12 +++++--
arch/powerpc/kernel/head_book3s_32.S | 27 ++++++++++-----
arch/powerpc/kernel/head_booke.h | 49 +++++++++++++++-------------
arch/powerpc/kernel/head_fsl_booke.S | 14 +++++---
7 files changed, 91 insertions(+), 105 deletions(-)
diff --git a/arch/powerpc/kernel/entry_32.S b/arch/powerpc/kernel/entry_32.S
index d8a913f850ef..75ca010bd78d 100644
--- a/arch/powerpc/kernel/entry_32.S
+++ b/arch/powerpc/kernel/entry_32.S
@@ -48,30 +48,6 @@
*/
.align 12
-#ifdef CONFIG_BOOKE
- .globl mcheck_transfer_to_handler
-mcheck_transfer_to_handler:
- /* fall through */
-_ASM_NOKPROBE_SYMBOL(mcheck_transfer_to_handler)
-
- .globl debug_transfer_to_handler
-debug_transfer_to_handler:
- /* fall through */
-_ASM_NOKPROBE_SYMBOL(debug_transfer_to_handler)
-
- .globl crit_transfer_to_handler
-crit_transfer_to_handler:
- /* fall through */
-_ASM_NOKPROBE_SYMBOL(crit_transfer_to_handler)
-#endif
-
-#ifdef CONFIG_40x
- .globl crit_transfer_to_handler
-crit_transfer_to_handler:
- /* fall through */
-_ASM_NOKPROBE_SYMBOL(crit_transfer_to_handler)
-#endif
-
/*
* This code finishes saving the registers to the exception frame
* and jumps to the appropriate handler for the exception, turning
@@ -79,13 +55,6 @@ _ASM_NOKPROBE_SYMBOL(crit_transfer_to_handler)
* Note that we rely on the caller having set cr0.eq iff the exception
* occurred in kernel mode (i.e. MSR:PR = 0).
*/
- .globl transfer_to_handler_full
-transfer_to_handler_full:
-_ASM_NOKPROBE_SYMBOL(transfer_to_handler_full)
- /* fall through */
-
- .globl transfer_to_handler
-transfer_to_handler:
.globl prepare_transfer_to_handler
prepare_transfer_to_handler:
SAVE_NVGPRS(r11)
@@ -136,7 +105,6 @@ transfer_to_handler_cont:
b fast_exception_return
#endif
_ASM_NOKPROBE_SYMBOL(prepare_transfer_to_handler)
-_ASM_NOKPROBE_SYMBOL(transfer_to_handler)
_ASM_NOKPROBE_SYMBOL(transfer_to_handler_cont)
.globl transfer_to_syscall
@@ -333,14 +301,6 @@ fast_exception_return:
#endif
_ASM_NOKPROBE_SYMBOL(fast_exception_return)
- .globl ret_from_except_full
-ret_from_except_full:
- /* fall through */
-
- .globl ret_from_except
-ret_from_except:
-_ASM_NOKPROBE_SYMBOL(ret_from_except)
-
.globl interrupt_return
interrupt_return:
lwz r4,_MSR(r1)
diff --git a/arch/powerpc/kernel/head_32.h b/arch/powerpc/kernel/head_32.h
index 3ab0f3ad9a6a..412ede8610f7 100644
--- a/arch/powerpc/kernel/head_32.h
+++ b/arch/powerpc/kernel/head_32.h
@@ -189,20 +189,9 @@ _ASM_NOKPROBE_SYMBOL(\name\()_virt)
#define EXCEPTION(n, label, hdlr, xfer) \
START_EXCEPTION(n, label) \
EXCEPTION_PROLOG n label; \
- xfer(n, hdlr)
-
-#define EXC_XFER_TEMPLATE(hdlr, trap, msr, tfer, ret) \
- bl tfer; \
- bl hdlr; \
- b ret
-
-#define EXC_XFER_STD(n, hdlr) \
- EXC_XFER_TEMPLATE(hdlr, n, MSR_KERNEL, transfer_to_handler_full, \
- ret_from_except_full)
-
-#define EXC_XFER_LITE(n, hdlr) \
- EXC_XFER_TEMPLATE(hdlr, n, MSR_KERNEL, transfer_to_handler, \
- ret_from_except)
+ prepare_transfer_to_handler; \
+ bl hdlr; \
+ b interrupt_return
.macro vmap_stack_overflow_exception
__HEAD
@@ -218,7 +207,9 @@ _ASM_NOKPROBE_SYMBOL(\name\()_virt)
lwz r1, emergency_ctx@l(r1)
addi r1, r1, THREAD_SIZE - INT_FRAME_SIZE
EXCEPTION_PROLOG_2 0 vmap_stack_overflow
- EXC_XFER_STD(0, stack_overflow_exception)
+ prepare_transfer_to_handler
+ bl stack_overflow_exception
+ b interrupt_return
.endm
#endif /* __HEAD_32_H__ */
diff --git a/arch/powerpc/kernel/head_40x.S b/arch/powerpc/kernel/head_40x.S
index f3e5b462113f..7eb49ebd6000 100644
--- a/arch/powerpc/kernel/head_40x.S
+++ b/arch/powerpc/kernel/head_40x.S
@@ -187,8 +187,9 @@ _ASM_NOKPROBE_SYMBOL(\name\()_virt)
#define CRITICAL_EXCEPTION(n, label, hdlr) \
START_EXCEPTION(n, label); \
CRITICAL_EXCEPTION_PROLOG n label; \
- EXC_XFER_TEMPLATE(hdlr, n+2, (MSR_KERNEL & ~(MSR_ME|MSR_DE|MSR_CE)), \
- crit_transfer_to_handler, ret_from_crit_exc)
+ prepare_transfer_to_handler; \
+ bl hdlr; \
+ b ret_from_crit_exc
/*
* 0x0100 - Critical Interrupt Exception
@@ -209,7 +210,9 @@ _ASM_NOKPROBE_SYMBOL(\name\()_virt)
*/
START_EXCEPTION(0x0300, DataStorage)
EXCEPTION_PROLOG 0x300 DataStorage handle_dar_dsisr=1
- EXC_XFER_LITE(0x300, do_page_fault)
+ prepare_transfer_to_handler
+ bl do_page_fault
+ b interrupt_return
/*
* 0x0400 - Instruction Storage Exception
@@ -220,7 +223,9 @@ _ASM_NOKPROBE_SYMBOL(\name\()_virt)
li r5,0
stw r5, _ESR(r11) /* Zero ESR */
stw r12, _DEAR(r11) /* SRR0 as DEAR */
- EXC_XFER_LITE(0x400, do_page_fault)
+ prepare_transfer_to_handler
+ bl do_page_fault
+ b interrupt_return
/* 0x0500 - External Interrupt Exception */
EXCEPTION(0x0500, HardwareInterrupt, do_IRQ, EXC_XFER_LITE)
@@ -499,9 +504,9 @@ _ASM_NOKPROBE_SYMBOL(\name\()_virt)
/* continue normal handling for a critical exception... */
2: mfspr r4,SPRN_DBSR
stw r4,_ESR(r11) /* DebugException takes DBSR in _ESR */
- EXC_XFER_TEMPLATE(DebugException, 0x2002, \
- (MSR_KERNEL & ~(MSR_ME|MSR_DE|MSR_CE)), \
- crit_transfer_to_handler, ret_from_crit_exc)
+ prepare_transfer_to_handler
+ bl DebugException
+ b ret_from_crit_exc
/* Programmable Interval Timer (PIT) Exception. (from 0x1000) */
__HEAD
@@ -509,21 +514,25 @@ Decrementer:
EXCEPTION_PROLOG 0x1000 Decrementer
lis r0,TSR_PIS@h
mtspr SPRN_TSR,r0 /* Clear the PIT exception */
- EXC_XFER_LITE(0x1000, timer_interrupt)
+ prepare_transfer_to_handler
+ bl timer_interrupt
+ b interrupt_return
/* Fixed Interval Timer (FIT) Exception. (from 0x1010) */
__HEAD
FITException:
EXCEPTION_PROLOG 0x1010 FITException
- EXC_XFER_STD(0x1010, unknown_exception)
+ prepare_transfer_to_handler
+ bl unknown_exception
+ b interrupt_return
/* Watchdog Timer (WDT) Exception. (from 0x1020) */
__HEAD
WDTException:
CRITICAL_EXCEPTION_PROLOG 0x1020 WDTException
- EXC_XFER_TEMPLATE(WatchdogException, 0x1020+2,
- (MSR_KERNEL & ~(MSR_ME|MSR_DE|MSR_CE)),
- crit_transfer_to_handler, ret_from_crit_exc)
+ prepare_transfer_to_handler
+ bl WatchdogException
+ b ret_from_crit_exc
/* Other PowerPC processors, namely those derived from the 6xx-series
* have vectors from 0x2100 through 0x2F00 defined, but marked as reserved.
diff --git a/arch/powerpc/kernel/head_8xx.S b/arch/powerpc/kernel/head_8xx.S
index 86f844eb0e5a..4d73549722a1 100644
--- a/arch/powerpc/kernel/head_8xx.S
+++ b/arch/powerpc/kernel/head_8xx.S
@@ -123,7 +123,9 @@ instruction_counter:
/* Machine check */
START_EXCEPTION(0x200, MachineCheck)
EXCEPTION_PROLOG 0x200 MachineCheck handle_dar_dsisr=1
- EXC_XFER_STD(0x200, machine_check_exception)
+ prepare_transfer_to_handler
+ bl machine_check_exception
+ b interrupt_return
/* External interrupt */
EXCEPTION(0x500, HardwareInterrupt, do_IRQ, EXC_XFER_LITE)
@@ -314,7 +316,9 @@ instruction_counter:
.Litlbie:
stw r12, _DAR(r11)
stw r5, _DSISR(r11)
- EXC_XFER_LITE(0x400, do_page_fault)
+ prepare_transfer_to_handler
+ bl do_page_fault
+ b interrupt_return
/* This is the data TLB error on the MPC8xx. This could be due to
* many reasons, including a dirty update to a pte. We bail out to
@@ -335,7 +339,9 @@ DARFixed:/* Return from dcbx instruction bug workaround */
beq+ .Ldtlbie
tlbie r4
.Ldtlbie:
- EXC_XFER_LITE(0x300, do_page_fault)
+ prepare_transfer_to_handler
+ bl do_page_fault
+ b interrupt_return
#ifdef CONFIG_VMAP_STACK
vmap_stack_overflow_exception
diff --git a/arch/powerpc/kernel/head_book3s_32.S b/arch/powerpc/kernel/head_book3s_32.S
index 609b2eedd4f9..0082342f0ae6 100644
--- a/arch/powerpc/kernel/head_book3s_32.S
+++ b/arch/powerpc/kernel/head_book3s_32.S
@@ -271,7 +271,9 @@ __secondary_hold_acknowledge:
beq cr1, 1f
twi 31, 0, 0
#endif
-1: EXC_XFER_STD(0x200, machine_check_exception)
+1: prepare_transfer_to_handler
+ bl machine_check_exception
+ b interrupt_return
/* Data access exception. */
START_EXCEPTION(0x300, DataAccess)
@@ -296,12 +298,13 @@ ALT_MMU_FTR_SECTION_END_IFSET(MMU_FTR_HPTE_TABLE)
1: EXCEPTION_PROLOG_0 handle_dar_dsisr=1
EXCEPTION_PROLOG_1
EXCEPTION_PROLOG_2 0x300 DataAccess handle_dar_dsisr=1
+ prepare_transfer_to_handler
lwz r5, _DSISR(r11)
andis. r0, r5, DSISR_DABRMATCH@h
bne- 1f
- EXC_XFER_LITE(0x300, do_page_fault)
-1: prepare_transfer_to_handler
- bl do_break
+ bl do_page_fault
+ b interrupt_return
+1: bl do_break
REST_NVGPRS(r1)
b interrupt_return
@@ -331,7 +334,9 @@ END_MMU_FTR_SECTION_IFSET(MMU_FTR_HPTE_TABLE)
andis. r5,r9,DSISR_SRR1_MATCH_32S@h /* Filter relevant SRR1 bits */
stw r5, _DSISR(r11)
stw r12, _DAR(r11)
- EXC_XFER_LITE(0x400, do_page_fault)
+ prepare_transfer_to_handler
+ bl do_page_fault
+ b interrupt_return
/* External interrupt */
EXCEPTION(0x500, HardwareInterrupt, do_IRQ, EXC_XFER_LITE)
@@ -366,7 +371,9 @@ END_FTR_SECTION_IFSET(CPU_FTR_FPU_UNAVAILABLE)
beq 1f
bl load_up_fpu /* if from user, just load it up */
b fast_exception_return
-1: EXC_XFER_LITE(0x800, kernel_fp_unavailable_exception)
+1: prepare_transfer_to_handler
+ bl kernel_fp_unavailable_exception
+ b interrupt_return
#else
b ProgramCheck
#endif
@@ -727,12 +734,16 @@ AltiVecUnavailable:
bl load_up_altivec /* if from user, just load it up */
b fast_exception_return
#endif /* CONFIG_ALTIVEC */
-1: EXC_XFER_LITE(0xf20, altivec_unavailable_exception)
+1: prepare_transfer_to_handler
+ bl altivec_unavailable_exception
+ b interrupt_return
__HEAD
PerformanceMonitor:
EXCEPTION_PROLOG 0xf00 PerformanceMonitor
- EXC_XFER_STD(0xf00, performance_monitor_exception)
+ prepare_transfer_to_handler
+ bl performance_monitor_exception
+ b interrupt_return
__HEAD
diff --git a/arch/powerpc/kernel/head_booke.h b/arch/powerpc/kernel/head_booke.h
index 809d1c6c9af9..ae6ce924b49a 100644
--- a/arch/powerpc/kernel/head_booke.h
+++ b/arch/powerpc/kernel/head_booke.h
@@ -302,15 +302,18 @@ ALT_FTR_SECTION_END_IFSET(CPU_FTR_EMB_HV)
#define EXCEPTION(n, intno, label, hdlr, xfer) \
START_EXCEPTION(label); \
NORMAL_EXCEPTION_PROLOG(n, intno); \
- xfer(n, hdlr)
+ prepare_transfer_to_handler; \
+ bl hdlr; \
+ b interrupt_return
#define CRITICAL_EXCEPTION(n, intno, label, hdlr) \
START_EXCEPTION(label); \
CRITICAL_EXCEPTION_PROLOG(n, intno); \
SAVE_MMU_REGS; \
SAVE_xSRR SRR; \
- EXC_XFER_TEMPLATE(hdlr, n+2, (MSR_KERNEL & ~(MSR_ME|MSR_DE|MSR_CE)), \
- crit_transfer_to_handler, ret_from_crit_exc)
+ prepare_transfer_to_handler; \
+ bl hdlr; \
+ b ret_from_crit_exc
#define MCHECK_EXCEPTION(n, label, hdlr) \
START_EXCEPTION(label); \
@@ -321,21 +324,9 @@ ALT_FTR_SECTION_END_IFSET(CPU_FTR_EMB_HV)
SAVE_xSRR CSRR; \
SAVE_MMU_REGS; \
SAVE_xSRR SRR; \
- EXC_XFER_TEMPLATE(hdlr, n+4, (MSR_KERNEL & ~(MSR_ME|MSR_DE|MSR_CE)), \
- mcheck_transfer_to_handler, ret_from_mcheck_exc)
-
-#define EXC_XFER_TEMPLATE(hdlr, trap, msr, tfer, ret) \
- bl tfer; \
+ prepare_transfer_to_handler; \
bl hdlr; \
- b ret; \
-
-#define EXC_XFER_STD(n, hdlr) \
- EXC_XFER_TEMPLATE(hdlr, n, MSR_KERNEL, transfer_to_handler_full, \
- ret_from_except_full)
-
-#define EXC_XFER_LITE(n, hdlr) \
- EXC_XFER_TEMPLATE(hdlr, n, MSR_KERNEL, transfer_to_handler, \
- ret_from_except)
+ b ret_from_mcheck_exc
/* Check for a single step debug exception while in an exception
* handler before state has been saved. This is to catch the case
@@ -404,7 +395,9 @@ ALT_FTR_SECTION_END_IFSET(CPU_FTR_EMB_HV)
SAVE_xSRR CSRR; \
SAVE_MMU_REGS; \
SAVE_xSRR SRR; \
- EXC_XFER_TEMPLATE(DebugException, 0x2008, (MSR_KERNEL & ~(MSR_ME|MSR_DE|MSR_CE)), debug_transfer_to_handler, ret_from_debug_exc)
+ prepare_transfer_to_handler; \
+ bl DebugException; \
+ b ret_from_debug_exc
#define DEBUG_CRIT_EXCEPTION \
START_EXCEPTION(DebugCrit); \
@@ -459,7 +452,9 @@ ALT_FTR_SECTION_END_IFSET(CPU_FTR_EMB_HV)
stw r4,_ESR(r11); /* DebugException takes DBSR in _ESR */\
SAVE_MMU_REGS; \
SAVE_xSRR SRR; \
- EXC_XFER_TEMPLATE(DebugException, 0x2002, (MSR_KERNEL & ~(MSR_ME|MSR_DE|MSR_CE)), crit_transfer_to_handler, ret_from_crit_exc)
+ prepare_transfer_to_handler; \
+ bl DebugException; \
+ b ret_from_crit_exc
#define DATA_STORAGE_EXCEPTION \
START_EXCEPTION(DataStorage) \
@@ -468,7 +463,9 @@ ALT_FTR_SECTION_END_IFSET(CPU_FTR_EMB_HV)
stw r5,_ESR(r11); \
mfspr r4,SPRN_DEAR; /* Grab the DEAR */ \
stw r4, _DEAR(r11); \
- EXC_XFER_LITE(0x0300, do_page_fault)
+ prepare_transfer_to_handler; \
+ bl do_page_fault; \
+ b interrupt_return
#define INSTRUCTION_STORAGE_EXCEPTION \
START_EXCEPTION(InstructionStorage) \
@@ -476,7 +473,9 @@ ALT_FTR_SECTION_END_IFSET(CPU_FTR_EMB_HV)
mfspr r5,SPRN_ESR; /* Grab the ESR and save it */ \
stw r5,_ESR(r11); \
stw r12, _DEAR(r11); /* Pass SRR0 as arg2 */ \
- EXC_XFER_LITE(0x0400, do_page_fault)
+ prepare_transfer_to_handler; \
+ bl do_page_fault; \
+ b interrupt_return
#define ALIGNMENT_EXCEPTION \
START_EXCEPTION(Alignment) \
@@ -503,7 +502,9 @@ ALT_FTR_SECTION_END_IFSET(CPU_FTR_EMB_HV)
NORMAL_EXCEPTION_PROLOG(0x900, DECREMENTER); \
lis r0,TSR_DIS@h; /* Setup the DEC interrupt mask */ \
mtspr SPRN_TSR,r0; /* Clear the DEC interrupt */ \
- EXC_XFER_LITE(0x0900, timer_interrupt)
+ prepare_transfer_to_handler; \
+ bl timer_interrupt; \
+ b interrupt_return
#define FP_UNAVAILABLE_EXCEPTION \
START_EXCEPTION(FloatingPointUnavailable) \
@@ -511,7 +512,9 @@ ALT_FTR_SECTION_END_IFSET(CPU_FTR_EMB_HV)
beq 1f; \
bl load_up_fpu; /* if from user, just load it up */ \
b fast_exception_return; \
-1: EXC_XFER_STD(0x800, kernel_fp_unavailable_exception)
+1: prepare_transfer_to_handler; \
+ bl kernel_fp_unavailable_exception; \
+ b interrupt_return
#else /* __ASSEMBLY__ */
struct exception_regs {
diff --git a/arch/powerpc/kernel/head_fsl_booke.S b/arch/powerpc/kernel/head_fsl_booke.S
index 210871b2eb41..48d022b1f508 100644
--- a/arch/powerpc/kernel/head_fsl_booke.S
+++ b/arch/powerpc/kernel/head_fsl_booke.S
@@ -370,9 +370,13 @@ interrupt_base:
stw r4, _DEAR(r11)
andis. r10,r5,(ESR_ILK|ESR_DLK)@h
bne 1f
- EXC_XFER_LITE(0x0300, do_page_fault)
+ prepare_transfer_to_handler
+ bl do_page_fault
+ b interrupt_return
1:
- EXC_XFER_LITE(0x0300, CacheLockingException)
+ prepare_transfer_to_handler
+ bl CacheLockingException
+ b interrupt_return
/* Instruction Storage Interrupt */
INSTRUCTION_STORAGE_EXCEPTION
@@ -617,7 +621,9 @@ END_BTB_FLUSH_SECTION
beq 1f
bl load_up_spe
b fast_exception_return
-1: EXC_XFER_LITE(0x2010, KernelSPE)
+1: prepare_transfer_to_handler
+ bl KernelSPE
+ b interrupt_return
#elif defined(CONFIG_SPE_POSSIBLE)
EXCEPTION(0x2020, SPE_UNAVAIL, SPEUnavailable, \
unknown_exception, EXC_XFER_STD)
@@ -860,7 +866,7 @@ KernelSPE:
lwz r5,_NIP(r1)
bl printk
#endif
- b ret_from_except
+ b interrupt_return
#ifdef CONFIG_PRINTK
87: .string "SPE used in kernel (task=%p, pc=%x) \n"
#endif
--
2.25.0
^ permalink raw reply related
* [RFC PATCH v1 31/41] powerpc/32: Remove the xfer parameter in EXCEPTION() macro
From: Christophe Leroy @ 2021-02-09 9:56 UTC (permalink / raw)
To: Benjamin Herrenschmidt, Paul Mackerras, Michael Ellerman, npiggin
Cc: linuxppc-dev, linux-kernel
In-Reply-To: <cover.1612864003.git.christophe.leroy@csgroup.eu>
The xfer parameter is not used anymore, remove it.
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
---
arch/powerpc/kernel/head_32.h | 2 +-
arch/powerpc/kernel/head_40x.S | 42 ++++++++--------
arch/powerpc/kernel/head_44x.S | 10 ++--
arch/powerpc/kernel/head_8xx.S | 14 +++---
arch/powerpc/kernel/head_book3s_32.S | 72 ++++++++++++++--------------
arch/powerpc/kernel/head_booke.h | 2 +-
arch/powerpc/kernel/head_fsl_booke.S | 28 +++++------
7 files changed, 81 insertions(+), 89 deletions(-)
diff --git a/arch/powerpc/kernel/head_32.h b/arch/powerpc/kernel/head_32.h
index 412ede8610f7..84e6251622e8 100644
--- a/arch/powerpc/kernel/head_32.h
+++ b/arch/powerpc/kernel/head_32.h
@@ -186,7 +186,7 @@ _ASM_NOKPROBE_SYMBOL(\name\()_virt)
#endif
-#define EXCEPTION(n, label, hdlr, xfer) \
+#define EXCEPTION(n, label, hdlr) \
START_EXCEPTION(n, label) \
EXCEPTION_PROLOG n label; \
prepare_transfer_to_handler; \
diff --git a/arch/powerpc/kernel/head_40x.S b/arch/powerpc/kernel/head_40x.S
index 7eb49ebd6000..52b40bf529c6 100644
--- a/arch/powerpc/kernel/head_40x.S
+++ b/arch/powerpc/kernel/head_40x.S
@@ -228,7 +228,7 @@ _ASM_NOKPROBE_SYMBOL(\name\()_virt)
b interrupt_return
/* 0x0500 - External Interrupt Exception */
- EXCEPTION(0x0500, HardwareInterrupt, do_IRQ, EXC_XFER_LITE)
+ EXCEPTION(0x0500, HardwareInterrupt, do_IRQ)
/* 0x0600 - Alignment Exception */
START_EXCEPTION(0x0600, Alignment)
@@ -246,19 +246,19 @@ _ASM_NOKPROBE_SYMBOL(\name\()_virt)
REST_NVGPRS(r1)
b interrupt_return
- EXCEPTION(0x0800, Trap_08, unknown_exception, EXC_XFER_STD)
- EXCEPTION(0x0900, Trap_09, unknown_exception, EXC_XFER_STD)
- EXCEPTION(0x0A00, Trap_0A, unknown_exception, EXC_XFER_STD)
- EXCEPTION(0x0B00, Trap_0B, unknown_exception, EXC_XFER_STD)
+ EXCEPTION(0x0800, Trap_08, unknown_exception)
+ EXCEPTION(0x0900, Trap_09, unknown_exception)
+ EXCEPTION(0x0A00, Trap_0A, unknown_exception)
+ EXCEPTION(0x0B00, Trap_0B, unknown_exception)
/* 0x0C00 - System Call Exception */
START_EXCEPTION(0x0C00, SystemCall)
SYSCALL_ENTRY 0xc00
/* Trap_0D is commented out to get more space for system call exception */
-/* EXCEPTION(0x0D00, Trap_0D, unknown_exception, EXC_XFER_STD) */
- EXCEPTION(0x0E00, Trap_0E, unknown_exception, EXC_XFER_STD)
- EXCEPTION(0x0F00, Trap_0F, unknown_exception, EXC_XFER_STD)
+/* EXCEPTION(0x0D00, Trap_0D, unknown_exception) */
+ EXCEPTION(0x0E00, Trap_0E, unknown_exception)
+ EXCEPTION(0x0F00, Trap_0F, unknown_exception)
/* 0x1000 - Programmable Interval Timer (PIT) Exception */
START_EXCEPTION(0x1000, DecrementerTrap)
@@ -433,19 +433,19 @@ _ASM_NOKPROBE_SYMBOL(\name\()_virt)
mfspr r10, SPRN_SPRG_SCRATCH5
b InstructionAccess
- EXCEPTION(0x1300, Trap_13, unknown_exception, EXC_XFER_STD)
- EXCEPTION(0x1400, Trap_14, unknown_exception, EXC_XFER_STD)
- EXCEPTION(0x1500, Trap_15, unknown_exception, EXC_XFER_STD)
- EXCEPTION(0x1600, Trap_16, unknown_exception, EXC_XFER_STD)
- EXCEPTION(0x1700, Trap_17, unknown_exception, EXC_XFER_STD)
- EXCEPTION(0x1800, Trap_18, unknown_exception, EXC_XFER_STD)
- EXCEPTION(0x1900, Trap_19, unknown_exception, EXC_XFER_STD)
- EXCEPTION(0x1A00, Trap_1A, unknown_exception, EXC_XFER_STD)
- EXCEPTION(0x1B00, Trap_1B, unknown_exception, EXC_XFER_STD)
- EXCEPTION(0x1C00, Trap_1C, unknown_exception, EXC_XFER_STD)
- EXCEPTION(0x1D00, Trap_1D, unknown_exception, EXC_XFER_STD)
- EXCEPTION(0x1E00, Trap_1E, unknown_exception, EXC_XFER_STD)
- EXCEPTION(0x1F00, Trap_1F, unknown_exception, EXC_XFER_STD)
+ EXCEPTION(0x1300, Trap_13, unknown_exception)
+ EXCEPTION(0x1400, Trap_14, unknown_exception)
+ EXCEPTION(0x1500, Trap_15, unknown_exception)
+ EXCEPTION(0x1600, Trap_16, unknown_exception)
+ EXCEPTION(0x1700, Trap_17, unknown_exception)
+ EXCEPTION(0x1800, Trap_18, unknown_exception)
+ EXCEPTION(0x1900, Trap_19, unknown_exception)
+ EXCEPTION(0x1A00, Trap_1A, unknown_exception)
+ EXCEPTION(0x1B00, Trap_1B, unknown_exception)
+ EXCEPTION(0x1C00, Trap_1C, unknown_exception)
+ EXCEPTION(0x1D00, Trap_1D, unknown_exception)
+ EXCEPTION(0x1E00, Trap_1E, unknown_exception)
+ EXCEPTION(0x1F00, Trap_1F, unknown_exception)
/* Check for a single step debug exception while in an exception
* handler before state has been saved. This is to catch the case
diff --git a/arch/powerpc/kernel/head_44x.S b/arch/powerpc/kernel/head_44x.S
index 813fa305c33b..5c106ac36626 100644
--- a/arch/powerpc/kernel/head_44x.S
+++ b/arch/powerpc/kernel/head_44x.S
@@ -263,8 +263,7 @@ interrupt_base:
INSTRUCTION_STORAGE_EXCEPTION
/* External Input Interrupt */
- EXCEPTION(0x0500, BOOKE_INTERRUPT_EXTERNAL, ExternalInput, \
- do_IRQ, EXC_XFER_LITE)
+ EXCEPTION(0x0500, BOOKE_INTERRUPT_EXTERNAL, ExternalInput, do_IRQ)
/* Alignment Interrupt */
ALIGNMENT_EXCEPTION
@@ -277,7 +276,7 @@ interrupt_base:
FP_UNAVAILABLE_EXCEPTION
#else
EXCEPTION(0x2010, BOOKE_INTERRUPT_FP_UNAVAIL, \
- FloatingPointUnavailable, unknown_exception, EXC_XFER_STD)
+ FloatingPointUnavailable, unknown_exception)
#endif
/* System Call Interrupt */
START_EXCEPTION(SystemCall)
@@ -285,15 +284,14 @@ interrupt_base:
/* Auxiliary Processor Unavailable Interrupt */
EXCEPTION(0x2020, BOOKE_INTERRUPT_AP_UNAVAIL, \
- AuxillaryProcessorUnavailable, unknown_exception, EXC_XFER_STD)
+ AuxillaryProcessorUnavailable, unknown_exception)
/* Decrementer Interrupt */
DECREMENTER_EXCEPTION
/* Fixed Internal Timer Interrupt */
/* TODO: Add FIT support */
- EXCEPTION(0x1010, BOOKE_INTERRUPT_FIT, FixedIntervalTimer, \
- unknown_exception, EXC_XFER_STD)
+ EXCEPTION(0x1010, BOOKE_INTERRUPT_FIT, FixedIntervalTimer, unknown_exception)
/* Watchdog Timer Interrupt */
/* TODO: Add watchdog support */
diff --git a/arch/powerpc/kernel/head_8xx.S b/arch/powerpc/kernel/head_8xx.S
index 4d73549722a1..34feb628c88d 100644
--- a/arch/powerpc/kernel/head_8xx.S
+++ b/arch/powerpc/kernel/head_8xx.S
@@ -118,7 +118,7 @@ instruction_counter:
#endif
/* System reset */
- EXCEPTION(0x100, Reset, system_reset_exception, EXC_XFER_STD)
+ EXCEPTION(0x100, Reset, system_reset_exception)
/* Machine check */
START_EXCEPTION(0x200, MachineCheck)
@@ -128,7 +128,7 @@ instruction_counter:
b interrupt_return
/* External interrupt */
- EXCEPTION(0x500, HardwareInterrupt, do_IRQ, EXC_XFER_LITE)
+ EXCEPTION(0x500, HardwareInterrupt, do_IRQ)
/* Alignment exception */
START_EXCEPTION(0x600, Alignment)
@@ -147,14 +147,14 @@ instruction_counter:
b interrupt_return
/* Decrementer */
- EXCEPTION(0x900, Decrementer, timer_interrupt, EXC_XFER_LITE)
+ EXCEPTION(0x900, Decrementer, timer_interrupt)
/* System call */
START_EXCEPTION(0xc00, SystemCall)
SYSCALL_ENTRY 0xc00
/* Single step - not used on 601 */
- EXCEPTION(0xd00, SingleStep, single_step_exception, EXC_XFER_STD)
+ EXCEPTION(0xd00, SingleStep, single_step_exception)
/* On the MPC8xx, this is a software emulation interrupt. It occurs
* for all unimplemented and illegal instructions.
@@ -384,10 +384,10 @@ DARFixed:/* Return from dcbx instruction bug workaround */
mfspr r10, SPRN_SPRG_SCRATCH0
rfi
#else
- EXCEPTION(0x1d00, Trap_1d, unknown_exception, EXC_XFER_STD)
+ EXCEPTION(0x1d00, Trap_1d, unknown_exception)
#endif
- EXCEPTION(0x1e00, Trap_1e, unknown_exception, EXC_XFER_STD)
- EXCEPTION(0x1f00, Trap_1f, unknown_exception, EXC_XFER_STD)
+ EXCEPTION(0x1e00, Trap_1e, unknown_exception)
+ EXCEPTION(0x1f00, Trap_1f, unknown_exception)
__HEAD
. = 0x2000
diff --git a/arch/powerpc/kernel/head_book3s_32.S b/arch/powerpc/kernel/head_book3s_32.S
index 0082342f0ae6..055441646f27 100644
--- a/arch/powerpc/kernel/head_book3s_32.S
+++ b/arch/powerpc/kernel/head_book3s_32.S
@@ -239,7 +239,7 @@ __secondary_hold_acknowledge:
/* System reset */
/* core99 pmac starts the seconary here by changing the vector, and
putting it back to what it was (unknown_async_exception) when done. */
- EXCEPTION(0x100, Reset, unknown_async_exception, EXC_XFER_STD)
+ EXCEPTION(0x100, Reset, unknown_async_exception)
/* Machine check */
/*
@@ -339,7 +339,7 @@ END_MMU_FTR_SECTION_IFSET(MMU_FTR_HPTE_TABLE)
b interrupt_return
/* External interrupt */
- EXCEPTION(0x500, HardwareInterrupt, do_IRQ, EXC_XFER_LITE)
+ EXCEPTION(0x500, HardwareInterrupt, do_IRQ)
/* Alignment exception */
START_EXCEPTION(0x600, Alignment)
@@ -379,17 +379,17 @@ END_FTR_SECTION_IFSET(CPU_FTR_FPU_UNAVAILABLE)
#endif
/* Decrementer */
- EXCEPTION(0x900, Decrementer, timer_interrupt, EXC_XFER_LITE)
+ EXCEPTION(0x900, Decrementer, timer_interrupt)
- EXCEPTION(0xa00, Trap_0a, unknown_exception, EXC_XFER_STD)
- EXCEPTION(0xb00, Trap_0b, unknown_exception, EXC_XFER_STD)
+ EXCEPTION(0xa00, Trap_0a, unknown_exception)
+ EXCEPTION(0xb00, Trap_0b, unknown_exception)
/* System call */
START_EXCEPTION(0xc00, SystemCall)
SYSCALL_ENTRY 0xc00
- EXCEPTION(0xd00, SingleStep, single_step_exception, EXC_XFER_STD)
- EXCEPTION(0xe00, Trap_0e, unknown_exception, EXC_XFER_STD)
+ EXCEPTION(0xd00, SingleStep, single_step_exception)
+ EXCEPTION(0xe00, Trap_0e, unknown_exception)
/*
* The Altivec unavailable trap is at 0x0f20. Foo.
@@ -615,35 +615,35 @@ END_MMU_FTR_SECTION_IFSET(MMU_FTR_NEED_DTLB_SW_LRU)
#define TAUException unknown_async_exception
#endif
- EXCEPTION(0x1300, Trap_13, instruction_breakpoint_exception, EXC_XFER_STD)
- EXCEPTION(0x1400, SMI, SMIException, EXC_XFER_STD)
- EXCEPTION(0x1500, Trap_15, unknown_exception, EXC_XFER_STD)
- EXCEPTION(0x1600, Trap_16, altivec_assist_exception, EXC_XFER_STD)
- EXCEPTION(0x1700, Trap_17, TAUException, EXC_XFER_STD)
- EXCEPTION(0x1800, Trap_18, unknown_exception, EXC_XFER_STD)
- EXCEPTION(0x1900, Trap_19, unknown_exception, EXC_XFER_STD)
- EXCEPTION(0x1a00, Trap_1a, unknown_exception, EXC_XFER_STD)
- EXCEPTION(0x1b00, Trap_1b, unknown_exception, EXC_XFER_STD)
- EXCEPTION(0x1c00, Trap_1c, unknown_exception, EXC_XFER_STD)
- EXCEPTION(0x1d00, Trap_1d, unknown_exception, EXC_XFER_STD)
- EXCEPTION(0x1e00, Trap_1e, unknown_exception, EXC_XFER_STD)
- EXCEPTION(0x1f00, Trap_1f, unknown_exception, EXC_XFER_STD)
- EXCEPTION(0x2000, RunMode, RunModeException, EXC_XFER_STD)
- EXCEPTION(0x2100, Trap_21, unknown_exception, EXC_XFER_STD)
- EXCEPTION(0x2200, Trap_22, unknown_exception, EXC_XFER_STD)
- EXCEPTION(0x2300, Trap_23, unknown_exception, EXC_XFER_STD)
- EXCEPTION(0x2400, Trap_24, unknown_exception, EXC_XFER_STD)
- EXCEPTION(0x2500, Trap_25, unknown_exception, EXC_XFER_STD)
- EXCEPTION(0x2600, Trap_26, unknown_exception, EXC_XFER_STD)
- EXCEPTION(0x2700, Trap_27, unknown_exception, EXC_XFER_STD)
- EXCEPTION(0x2800, Trap_28, unknown_exception, EXC_XFER_STD)
- EXCEPTION(0x2900, Trap_29, unknown_exception, EXC_XFER_STD)
- EXCEPTION(0x2a00, Trap_2a, unknown_exception, EXC_XFER_STD)
- EXCEPTION(0x2b00, Trap_2b, unknown_exception, EXC_XFER_STD)
- EXCEPTION(0x2c00, Trap_2c, unknown_exception, EXC_XFER_STD)
- EXCEPTION(0x2d00, Trap_2d, unknown_exception, EXC_XFER_STD)
- EXCEPTION(0x2e00, Trap_2e, unknown_exception, EXC_XFER_STD)
- EXCEPTION(0x2f00, Trap_2f, unknown_exception, EXC_XFER_STD)
+ EXCEPTION(0x1300, Trap_13, instruction_breakpoint_exception)
+ EXCEPTION(0x1400, SMI, SMIException)
+ EXCEPTION(0x1500, Trap_15, unknown_exception)
+ EXCEPTION(0x1600, Trap_16, altivec_assist_exception)
+ EXCEPTION(0x1700, Trap_17, TAUException)
+ EXCEPTION(0x1800, Trap_18, unknown_exception)
+ EXCEPTION(0x1900, Trap_19, unknown_exception)
+ EXCEPTION(0x1a00, Trap_1a, unknown_exception)
+ EXCEPTION(0x1b00, Trap_1b, unknown_exception)
+ EXCEPTION(0x1c00, Trap_1c, unknown_exception)
+ EXCEPTION(0x1d00, Trap_1d, unknown_exception)
+ EXCEPTION(0x1e00, Trap_1e, unknown_exception)
+ EXCEPTION(0x1f00, Trap_1f, unknown_exception)
+ EXCEPTION(0x2000, RunMode, RunModeException)
+ EXCEPTION(0x2100, Trap_21, unknown_exception)
+ EXCEPTION(0x2200, Trap_22, unknown_exception)
+ EXCEPTION(0x2300, Trap_23, unknown_exception)
+ EXCEPTION(0x2400, Trap_24, unknown_exception)
+ EXCEPTION(0x2500, Trap_25, unknown_exception)
+ EXCEPTION(0x2600, Trap_26, unknown_exception)
+ EXCEPTION(0x2700, Trap_27, unknown_exception)
+ EXCEPTION(0x2800, Trap_28, unknown_exception)
+ EXCEPTION(0x2900, Trap_29, unknown_exception)
+ EXCEPTION(0x2a00, Trap_2a, unknown_exception)
+ EXCEPTION(0x2b00, Trap_2b, unknown_exception)
+ EXCEPTION(0x2c00, Trap_2c, unknown_exception)
+ EXCEPTION(0x2d00, Trap_2d, unknown_exception)
+ EXCEPTION(0x2e00, Trap_2e, unknown_exception)
+ EXCEPTION(0x2f00, Trap_2f, unknown_exception)
__HEAD
. = 0x3000
diff --git a/arch/powerpc/kernel/head_booke.h b/arch/powerpc/kernel/head_booke.h
index ae6ce924b49a..7c8195ae95c4 100644
--- a/arch/powerpc/kernel/head_booke.h
+++ b/arch/powerpc/kernel/head_booke.h
@@ -299,7 +299,7 @@ ALT_FTR_SECTION_END_IFSET(CPU_FTR_EMB_HV)
.align 5; \
label:
-#define EXCEPTION(n, intno, label, hdlr, xfer) \
+#define EXCEPTION(n, intno, label, hdlr) \
START_EXCEPTION(label); \
NORMAL_EXCEPTION_PROLOG(n, intno); \
prepare_transfer_to_handler; \
diff --git a/arch/powerpc/kernel/head_fsl_booke.S b/arch/powerpc/kernel/head_fsl_booke.S
index 48d022b1f508..3efc5baa801a 100644
--- a/arch/powerpc/kernel/head_fsl_booke.S
+++ b/arch/powerpc/kernel/head_fsl_booke.S
@@ -382,7 +382,7 @@ interrupt_base:
INSTRUCTION_STORAGE_EXCEPTION
/* External Input Interrupt */
- EXCEPTION(0x0500, EXTERNAL, ExternalInput, do_IRQ, EXC_XFER_LITE)
+ EXCEPTION(0x0500, EXTERNAL, ExternalInput, do_IRQ)
/* Alignment Interrupt */
ALIGNMENT_EXCEPTION
@@ -394,8 +394,7 @@ interrupt_base:
#ifdef CONFIG_PPC_FPU
FP_UNAVAILABLE_EXCEPTION
#else
- EXCEPTION(0x0800, FP_UNAVAIL, FloatingPointUnavailable, \
- unknown_exception, EXC_XFER_STD)
+ EXCEPTION(0x0800, FP_UNAVAIL, FloatingPointUnavailable, unknown_exception)
#endif
/* System Call Interrupt */
@@ -403,16 +402,14 @@ interrupt_base:
SYSCALL_ENTRY 0xc00 BOOKE_INTERRUPT_SYSCALL SPRN_SRR1
/* Auxiliary Processor Unavailable Interrupt */
- EXCEPTION(0x2900, AP_UNAVAIL, AuxillaryProcessorUnavailable, \
- unknown_exception, EXC_XFER_STD)
+ EXCEPTION(0x2900, AP_UNAVAIL, AuxillaryProcessorUnavailable, unknown_exception)
/* Decrementer Interrupt */
DECREMENTER_EXCEPTION
/* Fixed Internal Timer Interrupt */
/* TODO: Add FIT support */
- EXCEPTION(0x3100, FIT, FixedIntervalTimer, \
- unknown_exception, EXC_XFER_STD)
+ EXCEPTION(0x3100, FIT, FixedIntervalTimer, unknown_exception)
/* Watchdog Timer Interrupt */
#ifdef CONFIG_BOOKE_WDT
@@ -625,8 +622,7 @@ END_BTB_FLUSH_SECTION
bl KernelSPE
b interrupt_return
#elif defined(CONFIG_SPE_POSSIBLE)
- EXCEPTION(0x2020, SPE_UNAVAIL, SPEUnavailable, \
- unknown_exception, EXC_XFER_STD)
+ EXCEPTION(0x2020, SPE_UNAVAIL, SPEUnavailable, unknown_exception)
#endif /* CONFIG_SPE_POSSIBLE */
/* SPE Floating Point Data */
@@ -646,18 +642,16 @@ END_BTB_FLUSH_SECTION
REST_NVGPRS(r1)
b interrupt_return
#elif defined(CONFIG_SPE_POSSIBLE)
- EXCEPTION(0x2040, SPE_FP_DATA, SPEFloatingPointData,
- unknown_exception, EXC_XFER_STD)
- EXCEPTION(0x2050, SPE_FP_ROUND, SPEFloatingPointRound, \
- unknown_exception, EXC_XFER_STD)
+ EXCEPTION(0x2040, SPE_FP_DATA, SPEFloatingPointData, unknown_exception)
+ EXCEPTION(0x2050, SPE_FP_ROUND, SPEFloatingPointRound, unknown_exception)
#endif /* CONFIG_SPE_POSSIBLE */
/* Performance Monitor */
EXCEPTION(0x2060, PERFORMANCE_MONITOR, PerformanceMonitor, \
- performance_monitor_exception, EXC_XFER_STD)
+ performance_monitor_exception)
- EXCEPTION(0x2070, DOORBELL, Doorbell, doorbell_exception, EXC_XFER_STD)
+ EXCEPTION(0x2070, DOORBELL, Doorbell, doorbell_exception)
CRITICAL_EXCEPTION(0x2080, DOORBELL_CRITICAL, \
CriticalDoorbell, unknown_exception)
@@ -672,10 +666,10 @@ END_BTB_FLUSH_SECTION
unknown_exception)
/* Hypercall */
- EXCEPTION(0, HV_SYSCALL, Hypercall, unknown_exception, EXC_XFER_STD)
+ EXCEPTION(0, HV_SYSCALL, Hypercall, unknown_exception)
/* Embedded Hypervisor Privilege */
- EXCEPTION(0, HV_PRIV, Ehvpriv, unknown_exception, EXC_XFER_STD)
+ EXCEPTION(0, HV_PRIV, Ehvpriv, unknown_exception)
interrupt_end:
--
2.25.0
^ permalink raw reply related
* [RFC PATCH v1 35/41] powerpc/32: Return directly from power_save_ppc32_restore()
From: Christophe Leroy @ 2021-02-09 9:57 UTC (permalink / raw)
To: Benjamin Herrenschmidt, Paul Mackerras, Michael Ellerman, npiggin
Cc: linuxppc-dev, linux-kernel
In-Reply-To: <cover.1612864003.git.christophe.leroy@csgroup.eu>
transfer_to_handler_cont: is now just a blr.
Directly perform blr in power_save_ppc32_restore().
Also remove useless setting of r11 in e500 version of
power_save_ppc32_restore().
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
---
arch/powerpc/kernel/entry_32.S | 2 --
arch/powerpc/kernel/idle_6xx.S | 2 +-
arch/powerpc/kernel/idle_e500.S | 10 +---------
3 files changed, 2 insertions(+), 12 deletions(-)
diff --git a/arch/powerpc/kernel/entry_32.S b/arch/powerpc/kernel/entry_32.S
index 71ef5ab84b03..70bc18f18f1a 100644
--- a/arch/powerpc/kernel/entry_32.S
+++ b/arch/powerpc/kernel/entry_32.S
@@ -75,8 +75,6 @@ prepare_transfer_to_handler:
bt- 31-TLF_NAPPING,4f
bt- 31-TLF_SLEEPING,7f
#endif /* CONFIG_PPC_BOOK3S_32 || CONFIG_E500 */
- .globl transfer_to_handler_cont
-transfer_to_handler_cont:
blr
#if defined (CONFIG_PPC_BOOK3S_32) || defined(CONFIG_E500)
diff --git a/arch/powerpc/kernel/idle_6xx.S b/arch/powerpc/kernel/idle_6xx.S
index 153366e178c4..13cad9297d82 100644
--- a/arch/powerpc/kernel/idle_6xx.S
+++ b/arch/powerpc/kernel/idle_6xx.S
@@ -176,7 +176,7 @@ BEGIN_FTR_SECTION
lwz r9,nap_save_hid1@l(r9)
mtspr SPRN_HID1, r9
END_FTR_SECTION_IFSET(CPU_FTR_DUAL_PLL_750FX)
- b transfer_to_handler_cont
+ blr
_ASM_NOKPROBE_SYMBOL(power_save_ppc32_restore)
.data
diff --git a/arch/powerpc/kernel/idle_e500.S b/arch/powerpc/kernel/idle_e500.S
index 7795727e7f08..9e1bc4502c50 100644
--- a/arch/powerpc/kernel/idle_e500.S
+++ b/arch/powerpc/kernel/idle_e500.S
@@ -81,13 +81,5 @@ END_FTR_SECTION_IFSET(CPU_FTR_CAN_NAP)
_GLOBAL(power_save_ppc32_restore)
lwz r9,_LINK(r11) /* interrupted in e500_idle */
stw r9,_NIP(r11) /* make it do a blr */
-
-#ifdef CONFIG_SMP
- lwz r11,TASK_CPU(r2) /* get cpu number * 4 */
- slwi r11,r11,2
-#else
- li r11,0
-#endif
-
- b transfer_to_handler_cont
+ blr
_ASM_NOKPROBE_SYMBOL(power_save_ppc32_restore)
--
2.25.0
^ permalink raw reply related
* [RFC PATCH v1 32/41] powerpc/32: Refactor saving of volatile registers in exception prologs
From: Christophe Leroy @ 2021-02-09 9:56 UTC (permalink / raw)
To: Benjamin Herrenschmidt, Paul Mackerras, Michael Ellerman, npiggin
Cc: linuxppc-dev, linux-kernel
In-Reply-To: <cover.1612864003.git.christophe.leroy@csgroup.eu>
Exception prologs all do the same at the end:
- Save trapno in stack
- Mark stack with exception marker
- Save r0
- Save r3 to r8
Refactor that into a COMMON_EXCEPTION_PROLOG_END macro.
At the same time use r1 instead of r11.
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
---
arch/powerpc/kernel/head_32.h | 14 +++++++++-----
arch/powerpc/kernel/head_40x.S | 9 +--------
arch/powerpc/kernel/head_booke.h | 26 +++++++++++++-------------
3 files changed, 23 insertions(+), 26 deletions(-)
diff --git a/arch/powerpc/kernel/head_32.h b/arch/powerpc/kernel/head_32.h
index 84e6251622e8..12c39178a1d2 100644
--- a/arch/powerpc/kernel/head_32.h
+++ b/arch/powerpc/kernel/head_32.h
@@ -104,14 +104,18 @@
li r10, MSR_KERNEL /* can take exceptions */
mtmsr r10 /* (except for mach check in rtas) */
#endif
- stw r0,GPR0(r11)
+ COMMON_EXCEPTION_PROLOG_END \trapno
+.endm
+
+.macro COMMON_EXCEPTION_PROLOG_END trapno
+ stw r0,GPR0(r1)
lis r10,STACK_FRAME_REGS_MARKER@ha /* exception frame marker */
addi r10,r10,STACK_FRAME_REGS_MARKER@l
- stw r10,8(r11)
+ stw r10,8(r1)
li r10, \trapno
- stw r10,_TRAP(r11)
- SAVE_4GPRS(3, r11)
- SAVE_2GPRS(7, r11)
+ stw r10,_TRAP(r1)
+ SAVE_4GPRS(3, r1)
+ SAVE_2GPRS(7, r1)
_ASM_NOKPROBE_SYMBOL(\name\()_virt)
.endm
diff --git a/arch/powerpc/kernel/head_40x.S b/arch/powerpc/kernel/head_40x.S
index 52b40bf529c6..e1360b88b6cb 100644
--- a/arch/powerpc/kernel/head_40x.S
+++ b/arch/powerpc/kernel/head_40x.S
@@ -157,14 +157,7 @@ _ENTRY(crit_esr)
mfspr r12,SPRN_SRR2
mfspr r9,SPRN_SRR3
rlwinm r9,r9,0,14,12 /* clear MSR_WE (necessary?) */
- stw r0,GPR0(r11)
- lis r10, STACK_FRAME_REGS_MARKER@ha /* exception frame marker */
- addi r10, r10, STACK_FRAME_REGS_MARKER@l
- stw r10, 8(r11)
- li r10, \trapno + 2
- stw r10,_TRAP(r11)
- SAVE_4GPRS(3, r11)
- SAVE_2GPRS(7, r11)
+ COMMON_EXCEPTION_PROLOG_END \trapno + 2
_ASM_NOKPROBE_SYMBOL(\name\()_virt)
.endm
diff --git a/arch/powerpc/kernel/head_booke.h b/arch/powerpc/kernel/head_booke.h
index 7c8195ae95c4..7e47b5dfdd9c 100644
--- a/arch/powerpc/kernel/head_booke.h
+++ b/arch/powerpc/kernel/head_booke.h
@@ -78,14 +78,18 @@ END_BTB_FLUSH_SECTION
stw r1, 0(r11); \
mr r1, r11; \
rlwinm r9,r9,0,14,12; /* clear MSR_WE (necessary?) */\
- stw r0,GPR0(r11); \
- lis r10, STACK_FRAME_REGS_MARKER@ha;/* exception frame marker */ \
- addi r10, r10, STACK_FRAME_REGS_MARKER@l; \
- stw r10, 8(r11); \
- li r10, trapno; \
- stw r10,_TRAP(r11); \
- SAVE_4GPRS(3, r11); \
- SAVE_2GPRS(7, r11)
+ COMMON_EXCEPTION_PROLOG_END trapno
+
+.macro COMMON_EXCEPTION_PROLOG_END trapno
+ stw r0,GPR0(r1)
+ lis r10, STACK_FRAME_REGS_MARKER@ha /* exception frame marker */
+ addi r10, r10, STACK_FRAME_REGS_MARKER@l
+ stw r10, 8(r1)
+ li r10, trapno
+ stw r10,_TRAP(r1)
+ SAVE_4GPRS(3, r1)
+ SAVE_2GPRS(7, r1)
+.end
.macro prepare_transfer_to_handler
bl prepare_transfer_to_handler
@@ -231,11 +235,7 @@ ALT_FTR_SECTION_END_IFSET(CPU_FTR_EMB_HV)
stw r1,0(r11); \
mr r1,r11; \
rlwinm r9,r9,0,14,12; /* clear MSR_WE (necessary?) */\
- li r10, trapno; \
- stw r10,_TRAP(r11); \
- stw r0,GPR0(r11); \
- SAVE_4GPRS(3, r11); \
- SAVE_2GPRS(7, r11)
+ COMMON_EXCEPTION_PROLOG_END trapno
.macro SAVE_xSRR xSRR
mfspr r0,SPRN_\xSRR\()0
--
2.25.0
^ permalink raw reply related
* [RFC PATCH v1 33/41] powerpc/32: Save remaining registers in exception prolog
From: Christophe Leroy @ 2021-02-09 9:56 UTC (permalink / raw)
To: Benjamin Herrenschmidt, Paul Mackerras, Michael Ellerman, npiggin
Cc: linuxppc-dev, linux-kernel
In-Reply-To: <cover.1612864003.git.christophe.leroy@csgroup.eu>
Save non volatile registers, XER, CTR, MSR and NIP in exception prolog.
Also assign proper value to r2 and r3 there.
For now, recalculate thread pointer in prepare_transfer_to_handler.
It will disappear once KUAP is ported to C.
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
---
arch/powerpc/kernel/entry_32.S | 18 +++---------------
arch/powerpc/kernel/head_32.h | 12 ++++++++++++
2 files changed, 15 insertions(+), 15 deletions(-)
diff --git a/arch/powerpc/kernel/entry_32.S b/arch/powerpc/kernel/entry_32.S
index 75ca010bd78d..fd24520b2e0c 100644
--- a/arch/powerpc/kernel/entry_32.S
+++ b/arch/powerpc/kernel/entry_32.S
@@ -57,20 +57,9 @@
*/
.globl prepare_transfer_to_handler
prepare_transfer_to_handler:
- SAVE_NVGPRS(r11)
- addi r3,r1,STACK_FRAME_OVERHEAD
- stw r2,GPR2(r11)
- stw r12,_NIP(r11)
- stw r9,_MSR(r11)
- andi. r2,r9,MSR_PR
- mfctr r12
- mfspr r2,SPRN_XER
- stw r12,_CTR(r11)
- stw r2,_XER(r11)
- mfspr r12,SPRN_SPRG_THREAD
- tovirt(r12, r12)
+ andi. r0,r9,MSR_PR
+ addi r12, r2, THREAD
beq 2f /* if from user, fix up THREAD.regs */
- addi r2, r12, -THREAD
stw r3,PT_REGS(r12)
#ifdef CONFIG_PPC_BOOK3S_32
kuep_lock r11, r12
@@ -80,8 +69,7 @@ prepare_transfer_to_handler:
2: /* if from kernel, check interrupted DOZE/NAP mode and
* check for stack overflow
*/
- kuap_save_and_lock r11, r12, r9, r2, r6
- addi r2, r12, -THREAD
+ kuap_save_and_lock r11, r12, r9, r5, r6
#if defined(CONFIG_PPC_BOOK3S_32) || defined(CONFIG_E500)
lwz r12,TI_LOCAL_FLAGS(r2)
mtcrf 0x01,r12
diff --git a/arch/powerpc/kernel/head_32.h b/arch/powerpc/kernel/head_32.h
index 12c39178a1d2..b29c13221baa 100644
--- a/arch/powerpc/kernel/head_32.h
+++ b/arch/powerpc/kernel/head_32.h
@@ -116,6 +116,18 @@
stw r10,_TRAP(r1)
SAVE_4GPRS(3, r1)
SAVE_2GPRS(7, r1)
+ SAVE_NVGPRS(r1)
+ stw r2,GPR2(r1)
+ stw r12,_NIP(r1)
+ stw r9,_MSR(r1)
+ mfctr r0
+ mfspr r10,SPRN_XER
+ mfspr r2,SPRN_SPRG_THREAD
+ stw r0,_CTR(r1)
+ tovirt(r2, r2)
+ stw r10,_XER(r1)
+ addi r2, r2, -THREAD
+ addi r3,r1,STACK_FRAME_OVERHEAD
_ASM_NOKPROBE_SYMBOL(\name\()_virt)
.endm
--
2.25.0
^ permalink raw reply related
* [RFC PATCH v1 34/41] powerpc/32: Set current->thread.regs in C interrupt entry
From: Christophe Leroy @ 2021-02-09 9:56 UTC (permalink / raw)
To: Benjamin Herrenschmidt, Paul Mackerras, Michael Ellerman, npiggin
Cc: linuxppc-dev, linux-kernel
In-Reply-To: <cover.1612864003.git.christophe.leroy@csgroup.eu>
No need to do that is assembly, do it in C.
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
---
arch/powerpc/include/asm/interrupt.h | 4 +++-
arch/powerpc/kernel/entry_32.S | 3 +--
2 files changed, 4 insertions(+), 3 deletions(-)
diff --git a/arch/powerpc/include/asm/interrupt.h b/arch/powerpc/include/asm/interrupt.h
index d70c761edc00..550ad1d69a7b 100644
--- a/arch/powerpc/include/asm/interrupt.h
+++ b/arch/powerpc/include/asm/interrupt.h
@@ -20,8 +20,10 @@ static inline void interrupt_enter_prepare(struct pt_regs *regs, struct interrup
if (regs->msr & MSR_EE)
trace_hardirqs_off();
- if (user_mode(regs))
+ if (user_mode(regs)) {
+ current->thread.regs = regs;
account_cpu_user_entry();
+ }
#endif
/*
* Book3E reconciles irq soft mask in asm
diff --git a/arch/powerpc/kernel/entry_32.S b/arch/powerpc/kernel/entry_32.S
index fd24520b2e0c..71ef5ab84b03 100644
--- a/arch/powerpc/kernel/entry_32.S
+++ b/arch/powerpc/kernel/entry_32.S
@@ -59,8 +59,7 @@
prepare_transfer_to_handler:
andi. r0,r9,MSR_PR
addi r12, r2, THREAD
- beq 2f /* if from user, fix up THREAD.regs */
- stw r3,PT_REGS(r12)
+ beq 2f
#ifdef CONFIG_PPC_BOOK3S_32
kuep_lock r11, r12
#endif
--
2.25.0
^ permalink raw reply related
* [RFC PATCH v1 36/41] powerpc/32: Only use prepare_transfer_to_handler function on book3s/32 and e500
From: Christophe Leroy @ 2021-02-09 9:57 UTC (permalink / raw)
To: Benjamin Herrenschmidt, Paul Mackerras, Michael Ellerman, npiggin
Cc: linuxppc-dev, linux-kernel
In-Reply-To: <cover.1612864003.git.christophe.leroy@csgroup.eu>
Only book3s/32 and e500 have significative work to do in
prepare_transfer_to_handler.
Other 32 bit have nothing to do at all.
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
---
arch/powerpc/kernel/entry_32.S | 6 ++----
arch/powerpc/kernel/head_32.h | 2 ++
arch/powerpc/kernel/head_booke.h | 2 ++
3 files changed, 6 insertions(+), 4 deletions(-)
diff --git a/arch/powerpc/kernel/entry_32.S b/arch/powerpc/kernel/entry_32.S
index 70bc18f18f1a..544a9a2270ff 100644
--- a/arch/powerpc/kernel/entry_32.S
+++ b/arch/powerpc/kernel/entry_32.S
@@ -55,6 +55,7 @@
* Note that we rely on the caller having set cr0.eq iff the exception
* occurred in kernel mode (i.e. MSR:PR = 0).
*/
+#if defined(CONFIG_PPC_BOOK3S_32) || defined(CONFIG_E500)
.globl prepare_transfer_to_handler
prepare_transfer_to_handler:
andi. r0,r9,MSR_PR
@@ -69,15 +70,12 @@ prepare_transfer_to_handler:
* check for stack overflow
*/
kuap_save_and_lock r11, r12, r9, r5, r6
-#if defined(CONFIG_PPC_BOOK3S_32) || defined(CONFIG_E500)
lwz r12,TI_LOCAL_FLAGS(r2)
mtcrf 0x01,r12
bt- 31-TLF_NAPPING,4f
bt- 31-TLF_SLEEPING,7f
-#endif /* CONFIG_PPC_BOOK3S_32 || CONFIG_E500 */
blr
-#if defined (CONFIG_PPC_BOOK3S_32) || defined(CONFIG_E500)
4: rlwinm r12,r12,0,~_TLF_NAPPING
stw r12,TI_LOCAL_FLAGS(r2)
b power_save_ppc32_restore
@@ -88,9 +86,9 @@ prepare_transfer_to_handler:
rlwinm r9,r9,0,~MSR_EE
stw r9,_MSR(r11)
b fast_exception_return
-#endif
_ASM_NOKPROBE_SYMBOL(prepare_transfer_to_handler)
_ASM_NOKPROBE_SYMBOL(transfer_to_handler_cont)
+#endif /* CONFIG_PPC_BOOK3S_32 || CONFIG_E500 */
.globl transfer_to_syscall
transfer_to_syscall:
diff --git a/arch/powerpc/kernel/head_32.h b/arch/powerpc/kernel/head_32.h
index b29c13221baa..e994ee3575d2 100644
--- a/arch/powerpc/kernel/head_32.h
+++ b/arch/powerpc/kernel/head_32.h
@@ -132,7 +132,9 @@ _ASM_NOKPROBE_SYMBOL(\name\()_virt)
.endm
.macro prepare_transfer_to_handler
+#ifdef CONFIG_PPC_BOOK3S_32
bl prepare_transfer_to_handler
+#endif
.endm
.macro SYSCALL_ENTRY trapno
diff --git a/arch/powerpc/kernel/head_booke.h b/arch/powerpc/kernel/head_booke.h
index 7e47b5dfdd9c..750ffc0915df 100644
--- a/arch/powerpc/kernel/head_booke.h
+++ b/arch/powerpc/kernel/head_booke.h
@@ -92,7 +92,9 @@ END_BTB_FLUSH_SECTION
.end
.macro prepare_transfer_to_handler
+#ifdef CONFIG_E500
bl prepare_transfer_to_handler
+#endif
.endm
.macro SYSCALL_ENTRY trapno intno srr1
--
2.25.0
^ permalink raw reply related
* [RFC PATCH v1 37/41] powerpc/32s: Move KUEP locking/unlocking in C
From: Christophe Leroy @ 2021-02-09 9:57 UTC (permalink / raw)
To: Benjamin Herrenschmidt, Paul Mackerras, Michael Ellerman, npiggin
Cc: linuxppc-dev, linux-kernel
In-Reply-To: <cover.1612864003.git.christophe.leroy@csgroup.eu>
This can be done in C, do it.
Unrolling the loop gains approx. 15% performance.
From now on, prepare_transfer_to_handler() is only for
interrupts from kernel.
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
---
arch/powerpc/include/asm/book3s/32/kup.h | 31 -------------------
arch/powerpc/include/asm/interrupt.h | 3 ++
arch/powerpc/include/asm/kup.h | 8 +++++
arch/powerpc/kernel/entry_32.S | 17 ++---------
arch/powerpc/kernel/interrupt.c | 4 +++
arch/powerpc/mm/book3s32/Makefile | 1 +
arch/powerpc/mm/book3s32/kuep.c | 38 ++++++++++++++++++++++++
7 files changed, 56 insertions(+), 46 deletions(-)
create mode 100644 arch/powerpc/mm/book3s32/kuep.c
diff --git a/arch/powerpc/include/asm/book3s/32/kup.h b/arch/powerpc/include/asm/book3s/32/kup.h
index 73bc5d2c431d..b97ea60f6fa3 100644
--- a/arch/powerpc/include/asm/book3s/32/kup.h
+++ b/arch/powerpc/include/asm/book3s/32/kup.h
@@ -7,37 +7,6 @@
#ifdef __ASSEMBLY__
-.macro kuep_update_sr gpr1, gpr2 /* NEVER use r0 as gpr2 due to addis */
-101: mtsrin \gpr1, \gpr2
- addi \gpr1, \gpr1, 0x111 /* next VSID */
- rlwinm \gpr1, \gpr1, 0, 0xf0ffffff /* clear VSID overflow */
- addis \gpr2, \gpr2, 0x1000 /* address of next segment */
- bdnz 101b
- isync
-.endm
-
-.macro kuep_lock gpr1, gpr2
-#ifdef CONFIG_PPC_KUEP
- li \gpr1, NUM_USER_SEGMENTS
- li \gpr2, 0
- mtctr \gpr1
- mfsrin \gpr1, \gpr2
- oris \gpr1, \gpr1, SR_NX@h /* set Nx */
- kuep_update_sr \gpr1, \gpr2
-#endif
-.endm
-
-.macro kuep_unlock gpr1, gpr2
-#ifdef CONFIG_PPC_KUEP
- li \gpr1, NUM_USER_SEGMENTS
- li \gpr2, 0
- mtctr \gpr1
- mfsrin \gpr1, \gpr2
- rlwinm \gpr1, \gpr1, 0, ~SR_NX /* Clear Nx */
- kuep_update_sr \gpr1, \gpr2
-#endif
-.endm
-
#ifdef CONFIG_PPC_KUAP
.macro kuap_update_sr gpr1, gpr2, gpr3 /* NEVER use r0 as gpr2 due to addis */
diff --git a/arch/powerpc/include/asm/interrupt.h b/arch/powerpc/include/asm/interrupt.h
index 550ad1d69a7b..e5e04e962165 100644
--- a/arch/powerpc/include/asm/interrupt.h
+++ b/arch/powerpc/include/asm/interrupt.h
@@ -21,6 +21,7 @@ static inline void interrupt_enter_prepare(struct pt_regs *regs, struct interrup
trace_hardirqs_off();
if (user_mode(regs)) {
+ kuep_lock();
current->thread.regs = regs;
account_cpu_user_entry();
}
@@ -83,6 +84,8 @@ static inline void interrupt_exit_prepare(struct pt_regs *regs, struct interrupt
exception_exit(state->ctx_state);
#endif
+ if (user_mode(regs))
+ kuep_unlock();
/*
* Book3S exits to user via interrupt_exit_user_prepare(), which does
* context tracking, which is a cleaner way to handle PREEMPT=y
diff --git a/arch/powerpc/include/asm/kup.h b/arch/powerpc/include/asm/kup.h
index 7ec21af49a45..25671f711ec2 100644
--- a/arch/powerpc/include/asm/kup.h
+++ b/arch/powerpc/include/asm/kup.h
@@ -55,6 +55,14 @@ void setup_kuep(bool disabled);
static inline void setup_kuep(bool disabled) { }
#endif /* CONFIG_PPC_KUEP */
+#if defined(CONFIG_PPC_KUEP) && defined(CONFIG_PPC_BOOK3S_32)
+void kuep_lock(void);
+void kuep_unlock(void);
+#else
+static inline void kuep_lock(void) { }
+static inline void kuep_unlock(void) { }
+#endif
+
#ifdef CONFIG_PPC_KUAP
void setup_kuap(bool disabled);
#else
diff --git a/arch/powerpc/kernel/entry_32.S b/arch/powerpc/kernel/entry_32.S
index 544a9a2270ff..3ae790a362d1 100644
--- a/arch/powerpc/kernel/entry_32.S
+++ b/arch/powerpc/kernel/entry_32.S
@@ -60,13 +60,9 @@
prepare_transfer_to_handler:
andi. r0,r9,MSR_PR
addi r12, r2, THREAD
- beq 2f
-#ifdef CONFIG_PPC_BOOK3S_32
- kuep_lock r11, r12
-#endif
- blr
+ bnelr
-2: /* if from kernel, check interrupted DOZE/NAP mode and
+ /* if from kernel, check interrupted DOZE/NAP mode and
* check for stack overflow
*/
kuap_save_and_lock r11, r12, r9, r5, r6
@@ -93,9 +89,6 @@ _ASM_NOKPROBE_SYMBOL(transfer_to_handler_cont)
.globl transfer_to_syscall
transfer_to_syscall:
SAVE_NVGPRS(r1)
-#ifdef CONFIG_PPC_BOOK3S_32
- kuep_lock r11, r12
-#endif
/* Calling convention has r9 = orig r0, r10 = regs */
addi r10,r1,STACK_FRAME_OVERHEAD
@@ -112,9 +105,6 @@ ret_from_syscall:
cmplwi cr0,r5,0
bne- 2f
#endif /* CONFIG_PPC_47x */
-#ifdef CONFIG_PPC_BOOK3S_32
- kuep_unlock r5, r7
-#endif
kuap_check r2, r4
lwz r4,_LINK(r1)
lwz r5,_CCR(r1)
@@ -295,9 +285,6 @@ interrupt_return:
bne- .Lrestore_nvgprs
.Lfast_user_interrupt_return:
-#ifdef CONFIG_PPC_BOOK3S_32
- kuep_unlock r10, r11
-#endif
kuap_check r2, r4
lwz r11,_NIP(r1)
lwz r12,_MSR(r1)
diff --git a/arch/powerpc/kernel/interrupt.c b/arch/powerpc/kernel/interrupt.c
index 6111acf61373..3c2e9b28b05d 100644
--- a/arch/powerpc/kernel/interrupt.c
+++ b/arch/powerpc/kernel/interrupt.c
@@ -30,6 +30,8 @@ notrace long system_call_exception(long r3, long r4, long r5,
syscall_fn f;
unsigned long expected_msr;
+ kuep_lock();
+
regs->orig_gpr3 = r3;
if (IS_ENABLED(CONFIG_PPC_IRQ_SOFT_MASK_DEBUG))
@@ -355,6 +357,8 @@ notrace unsigned long syscall_exit_prepare(unsigned long r3,
*/
kuap_user_restore(regs);
#endif
+ kuep_unlock();
+
return ret;
}
diff --git a/arch/powerpc/mm/book3s32/Makefile b/arch/powerpc/mm/book3s32/Makefile
index 446d9de88ce4..7f0c8a78ba0c 100644
--- a/arch/powerpc/mm/book3s32/Makefile
+++ b/arch/powerpc/mm/book3s32/Makefile
@@ -9,3 +9,4 @@ endif
obj-y += mmu.o mmu_context.o
obj-$(CONFIG_PPC_BOOK3S_603) += nohash_low.o
obj-$(CONFIG_PPC_BOOK3S_604) += hash_low.o tlb.o
+obj-$(CONFIG_PPC_KUEP) += kuep.o
diff --git a/arch/powerpc/mm/book3s32/kuep.c b/arch/powerpc/mm/book3s32/kuep.c
new file mode 100644
index 000000000000..7b3e4c57aaf9
--- /dev/null
+++ b/arch/powerpc/mm/book3s32/kuep.c
@@ -0,0 +1,38 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+#include <asm/reg.h>
+#include <asm/task_size_32.h>
+#include <asm/mmu.h>
+
+#define KUEP_UPDATE_TWO_USER_SEGMENTS(n) do { \
+ if (TASK_SIZE > (n << 28)) \
+ mtsr(val1, n << 28); \
+ if (TASK_SIZE > ((n + 1) << 28)) \
+ mtsr(val2, (n + 1) << 28); \
+ val1 = (val1 + 0x222) & 0xf0ffffff; \
+ val2 = (val2 + 0x222) & 0xf0ffffff; \
+} while (0)
+
+static __always_inline void kuep_update(u32 val)
+{
+ int val1 = val;
+ int val2 = (val + 0x111) & 0xf0ffffff;
+
+ KUEP_UPDATE_TWO_USER_SEGMENTS(0);
+ KUEP_UPDATE_TWO_USER_SEGMENTS(2);
+ KUEP_UPDATE_TWO_USER_SEGMENTS(4);
+ KUEP_UPDATE_TWO_USER_SEGMENTS(6);
+ KUEP_UPDATE_TWO_USER_SEGMENTS(8);
+ KUEP_UPDATE_TWO_USER_SEGMENTS(10);
+ KUEP_UPDATE_TWO_USER_SEGMENTS(12);
+ KUEP_UPDATE_TWO_USER_SEGMENTS(14);
+}
+
+void kuep_lock(void)
+{
+ kuep_update(mfsr(0) | SR_NX);
+}
+
+void kuep_unlock(void)
+{
+ kuep_update(mfsr(0) & ~SR_NX);
+}
--
2.25.0
^ permalink raw reply related
* [RFC PATCH v1 38/41] powerpc/64s: Make kuap_check_amr() and kuap_get_and_check_amr() generic
From: Christophe Leroy @ 2021-02-09 9:57 UTC (permalink / raw)
To: Benjamin Herrenschmidt, Paul Mackerras, Michael Ellerman, npiggin
Cc: linuxppc-dev, linux-kernel
In-Reply-To: <cover.1612864003.git.christophe.leroy@csgroup.eu>
In preparation of porting powerpc32 to C syscall entry/exit,
rename kuap_check_amr() and kuap_get_and_check_amr() as kuap_check()
and kuap_get_and_check(), and move in the generic asm/kup.h the stub
for when CONFIG_PPC_KUAP is not selected.
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
---
arch/powerpc/include/asm/book3s/64/kup.h | 24 ++----------------------
arch/powerpc/include/asm/kup.h | 10 +++++++++-
arch/powerpc/kernel/interrupt.c | 12 ++++++------
3 files changed, 17 insertions(+), 29 deletions(-)
diff --git a/arch/powerpc/include/asm/book3s/64/kup.h b/arch/powerpc/include/asm/book3s/64/kup.h
index 8bd905050896..d9b07e9998be 100644
--- a/arch/powerpc/include/asm/book3s/64/kup.h
+++ b/arch/powerpc/include/asm/book3s/64/kup.h
@@ -287,7 +287,7 @@ static inline void kuap_kernel_restore(struct pt_regs *regs,
*/
}
-static inline unsigned long kuap_get_and_check_amr(void)
+static inline unsigned long kuap_get_and_check(void)
{
if (mmu_has_feature(MMU_FTR_BOOK3S_KUAP)) {
unsigned long amr = mfspr(SPRN_AMR);
@@ -298,27 +298,7 @@ static inline unsigned long kuap_get_and_check_amr(void)
return 0;
}
-#else /* CONFIG_PPC_PKEY */
-
-static inline void kuap_user_restore(struct pt_regs *regs)
-{
-}
-
-static inline void kuap_kernel_restore(struct pt_regs *regs, unsigned long amr)
-{
-}
-
-static inline unsigned long kuap_get_and_check_amr(void)
-{
- return 0;
-}
-
-#endif /* CONFIG_PPC_PKEY */
-
-
-#ifdef CONFIG_PPC_KUAP
-
-static inline void kuap_check_amr(void)
+static inline void kuap_check(void)
{
if (IS_ENABLED(CONFIG_PPC_KUAP_DEBUG) && mmu_has_feature(MMU_FTR_BOOK3S_KUAP))
WARN_ON_ONCE(mfspr(SPRN_AMR) != AMR_KUAP_BLOCKED);
diff --git a/arch/powerpc/include/asm/kup.h b/arch/powerpc/include/asm/kup.h
index 25671f711ec2..b7efa46b3109 100644
--- a/arch/powerpc/include/asm/kup.h
+++ b/arch/powerpc/include/asm/kup.h
@@ -74,7 +74,15 @@ bad_kuap_fault(struct pt_regs *regs, unsigned long address, bool is_write)
return false;
}
-static inline void kuap_check_amr(void) { }
+static inline void kuap_check(void) { }
+static inline void kuap_save_and_lock(struct pt_regs *regs) { }
+static inline void kuap_user_restore(struct pt_regs *regs) { }
+static inline void kuap_kernel_restore(struct pt_regs *regs, unsigned long amr) { }
+
+static inline unsigned long kuap_get_and_check(void)
+{
+ return 0;
+}
/*
* book3s/64/kup-radix.h defines these functions for the !KUAP case to flush
diff --git a/arch/powerpc/kernel/interrupt.c b/arch/powerpc/kernel/interrupt.c
index 3c2e9b28b05d..8180ed261a27 100644
--- a/arch/powerpc/kernel/interrupt.c
+++ b/arch/powerpc/kernel/interrupt.c
@@ -75,7 +75,7 @@ notrace long system_call_exception(long r3, long r4, long r5,
} else
#endif
#ifdef CONFIG_PPC64
- kuap_check_amr();
+ kuap_check();
#endif
#ifdef CONFIG_PPC_ADV_DEBUG_REGS
@@ -241,7 +241,7 @@ notrace unsigned long syscall_exit_prepare(unsigned long r3,
CT_WARN_ON(ct_state() == CONTEXT_USER);
#ifdef CONFIG_PPC64
- kuap_check_amr();
+ kuap_check();
#endif
regs->result = r3;
@@ -381,7 +381,7 @@ notrace unsigned long interrupt_exit_user_prepare(struct pt_regs *regs, unsigned
* AMR can only have been unlocked if we interrupted the kernel.
*/
#ifdef CONFIG_PPC64
- kuap_check_amr();
+ kuap_check();
#endif
local_irq_save(flags);
@@ -467,7 +467,7 @@ notrace unsigned long interrupt_exit_kernel_prepare(struct pt_regs *regs, unsign
unsigned long flags;
unsigned long ret = 0;
#ifdef CONFIG_PPC64
- unsigned long amr;
+ unsigned long kuap;
#endif
if (!IS_ENABLED(CONFIG_BOOKE) && !IS_ENABLED(CONFIG_40x) &&
@@ -483,7 +483,7 @@ notrace unsigned long interrupt_exit_kernel_prepare(struct pt_regs *regs, unsign
CT_WARN_ON(ct_state() == CONTEXT_USER);
#ifdef CONFIG_PPC64
- amr = kuap_get_and_check_amr();
+ kuap = kuap_get_and_check();
#endif
if (unlikely(current_thread_info()->flags & _TIF_EMULATE_STACK_STORE)) {
@@ -527,7 +527,7 @@ notrace unsigned long interrupt_exit_kernel_prepare(struct pt_regs *regs, unsign
* value from the check above.
*/
#ifdef CONFIG_PPC64
- kuap_kernel_restore(regs, amr);
+ kuap_kernel_restore(regs, kuap);
#endif
return ret;
--
2.25.0
^ permalink raw reply related
* [RFC PATCH v1 39/41] powerpc/32s: Create C version of kuap save/restore/check helpers
From: Christophe Leroy @ 2021-02-09 9:57 UTC (permalink / raw)
To: Benjamin Herrenschmidt, Paul Mackerras, Michael Ellerman, npiggin
Cc: linuxppc-dev, linux-kernel
In-Reply-To: <cover.1612864003.git.christophe.leroy@csgroup.eu>
In preparation of porting PPC32 to C syscall entry/exit,
create C version of kuap_save_and_lock() and kuap_user_restore() and
kuap_kernel_restore() and kuap_check() and kuap_get_and_check()
on book3s/32.
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
---
arch/powerpc/include/asm/book3s/32/kup.h | 45 ++++++++++++++++++++++++
1 file changed, 45 insertions(+)
diff --git a/arch/powerpc/include/asm/book3s/32/kup.h b/arch/powerpc/include/asm/book3s/32/kup.h
index b97ea60f6fa3..c9d6c28bcd10 100644
--- a/arch/powerpc/include/asm/book3s/32/kup.h
+++ b/arch/powerpc/include/asm/book3s/32/kup.h
@@ -72,6 +72,51 @@ static inline void kuap_update_sr(u32 sr, u32 addr, u32 end)
isync(); /* Context sync required after mtsr() */
}
+static inline void kuap_save_and_lock(struct pt_regs *regs)
+{
+ unsigned long kuap = current->thread.kuap;
+ u32 addr = kuap & 0xf0000000;
+ u32 end = kuap << 28;
+
+ regs->kuap = kuap;
+ if (unlikely(!kuap))
+ return;
+
+ current->thread.kuap = 0;
+ kuap_update_sr(mfsr(addr) | SR_KS, addr, end); /* Set Ks */
+}
+
+static inline void kuap_user_restore(struct pt_regs *regs)
+{
+}
+
+static inline void kuap_kernel_restore(struct pt_regs *regs, unsigned long kuap)
+{
+ u32 addr = regs->kuap & 0xf0000000;
+ u32 end = regs->kuap << 28;
+
+ current->thread.kuap = regs->kuap;
+
+ if (unlikely(regs->kuap == kuap))
+ return;
+
+ kuap_update_sr(mfsr(addr) & ~SR_KS, addr, end); /* Clear Ks */
+}
+
+static inline unsigned long kuap_get_and_check(void)
+{
+ unsigned long kuap = current->thread.kuap;
+
+ WARN_ON_ONCE(IS_ENABLED(CONFIG_PPC_KUAP_DEBUG) && kuap != 0);
+
+ return kuap;
+}
+
+static inline void kuap_check(void)
+{
+ kuap_get_and_check();
+}
+
static __always_inline void allow_user_access(void __user *to, const void __user *from,
u32 size, unsigned long dir)
{
--
2.25.0
^ permalink raw reply related
* [RFC PATCH v1 41/41] powerpc/32: Manage KUAP in C
From: Christophe Leroy @ 2021-02-09 9:57 UTC (permalink / raw)
To: Benjamin Herrenschmidt, Paul Mackerras, Michael Ellerman, npiggin
Cc: linuxppc-dev, linux-kernel
In-Reply-To: <cover.1612864003.git.christophe.leroy@csgroup.eu>
Move all KUAP management in C.
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
---
arch/powerpc/include/asm/book3s/32/kup.h | 50 +-------------------
arch/powerpc/include/asm/interrupt.h | 2 +
arch/powerpc/include/asm/kup.h | 19 +-------
arch/powerpc/include/asm/nohash/32/kup-8xx.h | 25 +---------
arch/powerpc/kernel/entry_32.S | 6 ---
arch/powerpc/kernel/interrupt.c | 19 ++------
arch/powerpc/kernel/process.c | 3 ++
7 files changed, 12 insertions(+), 112 deletions(-)
diff --git a/arch/powerpc/include/asm/book3s/32/kup.h b/arch/powerpc/include/asm/book3s/32/kup.h
index c9d6c28bcd10..27991e0d2cf9 100644
--- a/arch/powerpc/include/asm/book3s/32/kup.h
+++ b/arch/powerpc/include/asm/book3s/32/kup.h
@@ -5,55 +5,7 @@
#include <asm/bug.h>
#include <asm/book3s/32/mmu-hash.h>
-#ifdef __ASSEMBLY__
-
-#ifdef CONFIG_PPC_KUAP
-
-.macro kuap_update_sr gpr1, gpr2, gpr3 /* NEVER use r0 as gpr2 due to addis */
-101: mtsrin \gpr1, \gpr2
- addi \gpr1, \gpr1, 0x111 /* next VSID */
- rlwinm \gpr1, \gpr1, 0, 0xf0ffffff /* clear VSID overflow */
- addis \gpr2, \gpr2, 0x1000 /* address of next segment */
- cmplw \gpr2, \gpr3
- blt- 101b
- isync
-.endm
-
-.macro kuap_save_and_lock sp, thread, gpr1, gpr2, gpr3
- lwz \gpr2, KUAP(\thread)
- rlwinm. \gpr3, \gpr2, 28, 0xf0000000
- stw \gpr2, STACK_REGS_KUAP(\sp)
- beq+ 102f
- li \gpr1, 0
- stw \gpr1, KUAP(\thread)
- mfsrin \gpr1, \gpr2
- oris \gpr1, \gpr1, SR_KS@h /* set Ks */
- kuap_update_sr \gpr1, \gpr2, \gpr3
-102:
-.endm
-
-.macro kuap_restore sp, current, gpr1, gpr2, gpr3
- lwz \gpr2, STACK_REGS_KUAP(\sp)
- rlwinm. \gpr3, \gpr2, 28, 0xf0000000
- stw \gpr2, THREAD + KUAP(\current)
- beq+ 102f
- mfsrin \gpr1, \gpr2
- rlwinm \gpr1, \gpr1, 0, ~SR_KS /* Clear Ks */
- kuap_update_sr \gpr1, \gpr2, \gpr3
-102:
-.endm
-
-.macro kuap_check current, gpr
-#ifdef CONFIG_PPC_KUAP_DEBUG
- lwz \gpr, THREAD + KUAP(\current)
-999: twnei \gpr, 0
- EMIT_BUG_ENTRY 999b, __FILE__, __LINE__, (BUGFLAG_WARNING | BUGFLAG_ONCE)
-#endif
-.endm
-
-#endif /* CONFIG_PPC_KUAP */
-
-#else /* !__ASSEMBLY__ */
+#ifndef __ASSEMBLY__
#ifdef CONFIG_PPC_KUAP
diff --git a/arch/powerpc/include/asm/interrupt.h b/arch/powerpc/include/asm/interrupt.h
index e5e04e962165..0e38185d4d90 100644
--- a/arch/powerpc/include/asm/interrupt.h
+++ b/arch/powerpc/include/asm/interrupt.h
@@ -24,6 +24,8 @@ static inline void interrupt_enter_prepare(struct pt_regs *regs, struct interrup
kuep_lock();
current->thread.regs = regs;
account_cpu_user_entry();
+ } else {
+ kuap_save_and_lock(regs);
}
#endif
/*
diff --git a/arch/powerpc/include/asm/kup.h b/arch/powerpc/include/asm/kup.h
index b7efa46b3109..f463256a57a6 100644
--- a/arch/powerpc/include/asm/kup.h
+++ b/arch/powerpc/include/asm/kup.h
@@ -26,24 +26,7 @@
#include <asm/book3s/32/kup.h>
#endif
-#ifdef __ASSEMBLY__
-#ifndef CONFIG_PPC_KUAP
-.macro kuap_save_and_lock sp, thread, gpr1, gpr2, gpr3
-.endm
-
-.macro kuap_restore sp, current, gpr1, gpr2, gpr3
-.endm
-
-.macro kuap_check current, gpr
-.endm
-
-.macro kuap_check_amr gpr1, gpr2
-.endm
-
-#endif
-
-#else /* !__ASSEMBLY__ */
-
+#ifndef __ASSEMBLY__
extern bool disable_kuep;
extern bool disable_kuap;
diff --git a/arch/powerpc/include/asm/nohash/32/kup-8xx.h b/arch/powerpc/include/asm/nohash/32/kup-8xx.h
index 6f191fe08a2e..add0413f31d4 100644
--- a/arch/powerpc/include/asm/nohash/32/kup-8xx.h
+++ b/arch/powerpc/include/asm/nohash/32/kup-8xx.h
@@ -7,30 +7,7 @@
#ifdef CONFIG_PPC_KUAP
-#ifdef __ASSEMBLY__
-
-.macro kuap_save_and_lock sp, thread, gpr1, gpr2, gpr3
- lis \gpr2, MD_APG_KUAP@h /* only APG0 and APG1 are used */
- mfspr \gpr1, SPRN_MD_AP
- mtspr SPRN_MD_AP, \gpr2
- stw \gpr1, STACK_REGS_KUAP(\sp)
-.endm
-
-.macro kuap_restore sp, current, gpr1, gpr2, gpr3
- lwz \gpr1, STACK_REGS_KUAP(\sp)
- mtspr SPRN_MD_AP, \gpr1
-.endm
-
-.macro kuap_check current, gpr
-#ifdef CONFIG_PPC_KUAP_DEBUG
- mfspr \gpr, SPRN_MD_AP
- rlwinm \gpr, \gpr, 16, 0xffff
-999: twnei \gpr, MD_APG_KUAP@h
- EMIT_BUG_ENTRY 999b, __FILE__, __LINE__, (BUGFLAG_WARNING | BUGFLAG_ONCE)
-#endif
-.endm
-
-#else /* !__ASSEMBLY__ */
+#ifndef __ASSEMBLY__
#include <asm/reg.h>
diff --git a/arch/powerpc/kernel/entry_32.S b/arch/powerpc/kernel/entry_32.S
index 3ae790a362d1..2f3b41c8b23f 100644
--- a/arch/powerpc/kernel/entry_32.S
+++ b/arch/powerpc/kernel/entry_32.S
@@ -59,13 +59,11 @@
.globl prepare_transfer_to_handler
prepare_transfer_to_handler:
andi. r0,r9,MSR_PR
- addi r12, r2, THREAD
bnelr
/* if from kernel, check interrupted DOZE/NAP mode and
* check for stack overflow
*/
- kuap_save_and_lock r11, r12, r9, r5, r6
lwz r12,TI_LOCAL_FLAGS(r2)
mtcrf 0x01,r12
bt- 31-TLF_NAPPING,4f
@@ -105,7 +103,6 @@ ret_from_syscall:
cmplwi cr0,r5,0
bne- 2f
#endif /* CONFIG_PPC_47x */
- kuap_check r2, r4
lwz r4,_LINK(r1)
lwz r5,_CCR(r1)
mtlr r4
@@ -217,7 +214,6 @@ END_FTR_SECTION_IFSET(CPU_FTR_SPE)
stw r10,_CCR(r1)
stw r1,KSP(r3) /* Set old stack pointer */
- kuap_check r2, r0
#ifdef CONFIG_SMP
/* We need a sync somewhere here to make sure that if the
* previous task gets rescheduled on another CPU, it sees all
@@ -285,7 +281,6 @@ interrupt_return:
bne- .Lrestore_nvgprs
.Lfast_user_interrupt_return:
- kuap_check r2, r4
lwz r11,_NIP(r1)
lwz r12,_MSR(r1)
mtspr SPRN_SRR0,r11
@@ -330,7 +325,6 @@ ALT_FTR_SECTION_END_IFCLR(CPU_FTR_STCX_CHECKS_ADDRESS)
.Lfast_kernel_interrupt_return:
cmpwi cr1,r3,0
- kuap_restore r1, r2, r3, r4, r5
lwz r11,_NIP(r1)
lwz r12,_MSR(r1)
mtspr SPRN_SRR0,r11
diff --git a/arch/powerpc/kernel/interrupt.c b/arch/powerpc/kernel/interrupt.c
index 8180ed261a27..42769d619f7d 100644
--- a/arch/powerpc/kernel/interrupt.c
+++ b/arch/powerpc/kernel/interrupt.c
@@ -31,6 +31,9 @@ notrace long system_call_exception(long r3, long r4, long r5,
unsigned long expected_msr;
kuep_lock();
+#ifdef CONFIG_PPC32
+ kuap_save_and_lock(regs);
+#endif
regs->orig_gpr3 = r3;
@@ -74,9 +77,7 @@ notrace long system_call_exception(long r3, long r4, long r5,
isync();
} else
#endif
-#ifdef CONFIG_PPC64
kuap_check();
-#endif
#ifdef CONFIG_PPC_ADV_DEBUG_REGS
if (IS_ENABLED(CONFIG_PPC32) && unlikely(current->thread.debug.dbcr0 & DBCR0_IDM)) {
@@ -240,9 +241,7 @@ notrace unsigned long syscall_exit_prepare(unsigned long r3,
CT_WARN_ON(ct_state() == CONTEXT_USER);
-#ifdef CONFIG_PPC64
kuap_check();
-#endif
regs->result = r3;
@@ -351,7 +350,7 @@ notrace unsigned long syscall_exit_prepare(unsigned long r3,
account_cpu_user_exit();
-#ifdef CONFIG_PPC_BOOK3S_64 /* BOOK3E and ppc32 not using this */
+#ifndef CONFIG_PPC_BOOK3E_64 /* BOOK3E not using this */
/*
* We do this at the end so that we do context switch with KERNEL AMR
*/
@@ -380,9 +379,7 @@ notrace unsigned long interrupt_exit_user_prepare(struct pt_regs *regs, unsigned
* We don't need to restore AMR on the way back to userspace for KUAP.
* AMR can only have been unlocked if we interrupted the kernel.
*/
-#ifdef CONFIG_PPC64
kuap_check();
-#endif
local_irq_save(flags);
@@ -453,9 +450,7 @@ notrace unsigned long interrupt_exit_user_prepare(struct pt_regs *regs, unsigned
/*
* We do this at the end so that we do context switch with KERNEL AMR
*/
-#ifdef CONFIG_PPC64
kuap_user_restore(regs);
-#endif
return ret;
}
@@ -466,9 +461,7 @@ notrace unsigned long interrupt_exit_kernel_prepare(struct pt_regs *regs, unsign
{
unsigned long flags;
unsigned long ret = 0;
-#ifdef CONFIG_PPC64
unsigned long kuap;
-#endif
if (!IS_ENABLED(CONFIG_BOOKE) && !IS_ENABLED(CONFIG_40x) &&
unlikely(!(regs->msr & MSR_RI)))
@@ -482,9 +475,7 @@ notrace unsigned long interrupt_exit_kernel_prepare(struct pt_regs *regs, unsign
if (TRAP(regs) != 0x700)
CT_WARN_ON(ct_state() == CONTEXT_USER);
-#ifdef CONFIG_PPC64
kuap = kuap_get_and_check();
-#endif
if (unlikely(current_thread_info()->flags & _TIF_EMULATE_STACK_STORE)) {
clear_bits(_TIF_EMULATE_STACK_STORE, ¤t_thread_info()->flags);
@@ -526,9 +517,7 @@ notrace unsigned long interrupt_exit_kernel_prepare(struct pt_regs *regs, unsign
* which would cause Read-After-Write stalls. Hence, we take the AMR
* value from the check above.
*/
-#ifdef CONFIG_PPC64
kuap_kernel_restore(regs, kuap);
-#endif
return ret;
}
diff --git a/arch/powerpc/kernel/process.c b/arch/powerpc/kernel/process.c
index 384951381329..dda871dd9bfb 100644
--- a/arch/powerpc/kernel/process.c
+++ b/arch/powerpc/kernel/process.c
@@ -1255,6 +1255,9 @@ struct task_struct *__switch_to(struct task_struct *prev,
*/
restore_sprs(old_thread, new_thread);
+#ifdef CONFIG_PPC32
+ kuap_check();
+#endif
last = _switch(old_thread, new_thread);
#ifdef CONFIG_PPC_BOOK3S_64
--
2.25.0
^ permalink raw reply related
* [RFC PATCH v1 40/41] powerpc/8xx: Create C version of kuap save/restore/check helpers
From: Christophe Leroy @ 2021-02-09 9:57 UTC (permalink / raw)
To: Benjamin Herrenschmidt, Paul Mackerras, Michael Ellerman, npiggin
Cc: linuxppc-dev, linux-kernel
In-Reply-To: <cover.1612864003.git.christophe.leroy@csgroup.eu>
In preparation of porting PPC32 to C syscall entry/exit,
create C version of kuap_save_and_lock() and kuap_user_restore() and
kuap_kernel_restore() and kuap_check() and kuap_get_and_check() on 8xx.
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
---
arch/powerpc/include/asm/nohash/32/kup-8xx.h | 33 ++++++++++++++++++++
1 file changed, 33 insertions(+)
diff --git a/arch/powerpc/include/asm/nohash/32/kup-8xx.h b/arch/powerpc/include/asm/nohash/32/kup-8xx.h
index 17a4a616436f..6f191fe08a2e 100644
--- a/arch/powerpc/include/asm/nohash/32/kup-8xx.h
+++ b/arch/powerpc/include/asm/nohash/32/kup-8xx.h
@@ -34,6 +34,39 @@
#include <asm/reg.h>
+static inline void kuap_save_and_lock(struct pt_regs *regs)
+{
+ regs->kuap = mfspr(SPRN_MD_AP);
+ mtspr(SPRN_MD_AP, MD_APG_KUAP);
+}
+
+static inline void kuap_user_restore(struct pt_regs *regs)
+{
+}
+
+static inline void kuap_kernel_restore(struct pt_regs *regs, unsigned long kuap)
+{
+ mtspr(SPRN_MD_AP, regs->kuap);
+}
+
+static inline void kuap_check(void)
+{
+ if (!IS_ENABLED(CONFIG_PPC_KUAP_DEBUG))
+ return;
+
+ WARN_ON_ONCE(mfspr(SPRN_MD_AP) >> 16 != MD_APG_KUAP >> 16);
+}
+
+static inline unsigned long kuap_get_and_check(void)
+{
+ unsigned long kuap = mfspr(SPRN_MD_AP);
+
+ if (IS_ENABLED(CONFIG_PPC_KUAP_DEBUG))
+ WARN_ON_ONCE(kuap >> 16 != MD_APG_KUAP >> 16);
+
+ return kuap;
+}
+
static inline void allow_user_access(void __user *to, const void __user *from,
unsigned long size, unsigned long dir)
{
--
2.25.0
^ permalink raw reply related
* linux-next: build failure after merge of the powerpc tree
From: Stephen Rothwell @ 2021-02-09 10:19 UTC (permalink / raw)
To: Michael Ellerman, PowerPC
Cc: Linux Next Mailing List, Linux Kernel Mailing List,
Nicholas Piggin
[-- Attachment #1: Type: text/plain, Size: 866 bytes --]
Hi all,
After merging the powerpc tree, today's linux-next build (powerpc
allyesconfig) failed like this:
arch/powerpc/kernel/head_64.o:(__ftr_alt_97+0x0): relocation truncated to fit: R_PPC64_REL24 (OPD) against symbol `do_page_fault' defined in .opd section in arch/powerpc/mm/fault.o
arch/powerpc/kernel/head_64.o:(__ftr_alt_97+0x8): relocation truncated to fit: R_PPC64_REL24 (OPD) against symbol `do_page_fault' defined in .opd section in arch/powerpc/mm/fault.o
arch/powerpc/kernel/head_64.o:(__ftr_alt_97+0x28): relocation truncated to fit: R_PPC64_REL24 (OPD) against symbol `unknown_exception' defined in .opd section in arch/powerpc/kernel/traps.o
Not sure exactly which commit caused this, but it is most likkely part
of a series in the powerpc tree.
I have left the allyesconfig build broken for today.
--
Cheers,
Stephen Rothwell
[-- Attachment #2: OpenPGP digital signature --]
[-- Type: application/pgp-signature, Size: 488 bytes --]
^ permalink raw reply
* [PATCH 2/3] powerpc/time: Avoid using get_tbl()
From: Christophe Leroy @ 2021-02-09 10:26 UTC (permalink / raw)
To: Benjamin Herrenschmidt, Paul Mackerras, Michael Ellerman, broonie
Cc: linuxppc-dev, linux-kernel, linux-spi
In-Reply-To: <99bf008e2970de7f8ed3225cda69a6d06ae1a644.1612866360.git.christophe.leroy@csgroup.eu>
get_tbl() is confusing as it returns the content TBL register
on PPC32 but the concatenation of TBL and TBU on PPC64.
Use mftb() instead.
This will allow the removal of get_tbl() in a following patch.
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
---
arch/powerpc/platforms/52xx/mpc52xx_lpbfifo.c | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)
diff --git a/arch/powerpc/platforms/52xx/mpc52xx_lpbfifo.c b/arch/powerpc/platforms/52xx/mpc52xx_lpbfifo.c
index 05e19470d523..b91ebebd9ff2 100644
--- a/arch/powerpc/platforms/52xx/mpc52xx_lpbfifo.c
+++ b/arch/powerpc/platforms/52xx/mpc52xx_lpbfifo.c
@@ -229,7 +229,7 @@ static irqreturn_t mpc52xx_lpbfifo_irq(int irq, void *dev_id)
int dma, write, poll_dma;
spin_lock_irqsave(&lpbfifo.lock, flags);
- ts = get_tbl();
+ ts = mftb();
req = lpbfifo.req;
if (!req) {
@@ -307,7 +307,7 @@ static irqreturn_t mpc52xx_lpbfifo_irq(int irq, void *dev_id)
if (irq != 0) /* don't increment on polled case */
req->irq_count++;
- req->irq_ticks += get_tbl() - ts;
+ req->irq_ticks += mftb() - ts;
spin_unlock_irqrestore(&lpbfifo.lock, flags);
/* Spinlock is released; it is now safe to call the callback */
@@ -330,7 +330,7 @@ static irqreturn_t mpc52xx_lpbfifo_bcom_irq(int irq, void *dev_id)
u32 ts;
spin_lock_irqsave(&lpbfifo.lock, flags);
- ts = get_tbl();
+ ts = mftb();
req = lpbfifo.req;
if (!req || (req->flags & MPC52XX_LPBFIFO_FLAG_NO_DMA)) {
@@ -361,7 +361,7 @@ static irqreturn_t mpc52xx_lpbfifo_bcom_irq(int irq, void *dev_id)
lpbfifo.req = NULL;
/* Release the lock before calling out to the callback. */
- req->irq_ticks += get_tbl() - ts;
+ req->irq_ticks += mftb() - ts;
spin_unlock_irqrestore(&lpbfifo.lock, flags);
if (req->callback)
--
2.25.0
^ permalink raw reply related
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