[PATCH 20/20] ARC: pt_regs: create seperate type for ecr

Vineet Gupta
2023-08-15T00:49:29Z

Reduces duplication in each ISA specific pt_regs

Signed-off-by: Vineet Gupta <vgupta@kernel.org>
---
arch/arc/include/asm/ptrace.h | 45 +++++++++++++---------------------
arch/arc/kernel/asm-offsets.c | 2 +-
arch/arc/kernel/kgdb.c | 2 +-
arch/arc/kernel/ptrace.c | 4 +--
arch/arc/kernel/traps.c | 4 +--
arch/arc/kernel/troubleshoot.c | 13 +++++-----
arch/arc/mm/fault.c | 6 ++---
7 files changed, 32 insertions(+), 44 deletions(-)

diff --git a/arch/arc/include/asm/ptrace.h b/arch/arc/include/asm/ptrace.h
index 3a054b695f28..724e3fe31ed5 100644
--- a/arch/arc/include/asm/ptrace.h
+++ b/arch/arc/include/asm/ptrace.h
@@ -12,6 +12,17 @@

#ifndef __ASSEMBLY__

+typedef union {
+ struct {
+#ifdef CONFIG_CPU_BIG_ENDIAN
+ unsigned long state:8, vec:8, cause:8, param:8;
+#else
+ unsigned long param:8, cause:8, vec:8, state:8;
+#endif
+ };
+ unsigned long full;
+} ecr_reg;
+
/* THE pt_regs: Defines how regs are saved during entry into kernel */

#ifdef CONFIG_ISA_ARCOMPACT
@@ -40,18 +51,7 @@ struct pt_regs {
* Last word used by Linux for extra state mgmt (syscall-restart)
* For interrupts, use artificial ECR values to note current prio-level
*/
- union {
- struct {
-#ifdef CONFIG_CPU_BIG_ENDIAN
- unsigned long state:8, ecr_vec:8,
- ecr_cause:8, ecr_param:8;
-#else
- unsigned long ecr_param:8, ecr_cause:8,
- ecr_vec:8, state:8;
-#endif
- };
- unsigned long event;
- };
+ ecr_reg ecr;
};

#define MAX_REG_OFFSET offsetof(struct pt_regs, event)
@@ -62,18 +62,7 @@ struct pt_regs {

unsigned long orig_r0;

- union {
- struct {
-#ifdef CONFIG_CPU_BIG_ENDIAN
- unsigned long state:8, ecr_vec:8,
- ecr_cause:8, ecr_param:8;
-#else
- unsigned long ecr_param:8, ecr_cause:8,
- ecr_vec:8, state:8;
-#endif
- };
- unsigned long event;
- };
+ ecr_reg ecr; /* Exception Cause Reg */

unsigned long bta; /* erbta */

@@ -131,13 +120,13 @@ struct callee_regs {
/* return 1 if PC in delay slot */
#define delay_mode(regs) ((regs->status32 & STATUS_DE_MASK) == STATUS_DE_MASK)

-#define in_syscall(regs) ((regs->ecr_vec == ECR_V_TRAP) && !regs->ecr_param)
-#define in_brkpt_trap(regs) ((regs->ecr_vec == ECR_V_TRAP) && regs->ecr_param)
+#define in_syscall(regs) ((regs->ecr.vec == ECR_V_TRAP) && !regs->ecr.param)
+#define in_brkpt_trap(regs) ((regs->ecr.vec == ECR_V_TRAP) && regs->ecr.param)

#define STATE_SCALL_RESTARTED 0x01

-#define syscall_wont_restart(reg) (reg->state |= STATE_SCALL_RESTARTED)
-#define syscall_restartable(reg) !(reg->state & STATE_SCALL_RESTARTED)
+#define syscall_wont_restart(regs) (regs->ecr.state |= STATE_SCALL_RESTARTED)
+#define syscall_restartable(regs) !(regs->ecr.state & STATE_SCALL_RESTARTED)

#define current_pt_regs() \
({ \
diff --git a/arch/arc/kernel/asm-offsets.c b/arch/arc/kernel/asm-offsets.c
index 478768c88f46..f77deb799175 100644
--- a/arch/arc/kernel/asm-offsets.c
+++ b/arch/arc/kernel/asm-offsets.c
@@ -46,7 +46,7 @@ int main(void)
BLANK();

DEFINE(PT_status32, offsetof(struct pt_regs, status32));
- DEFINE(PT_event, offsetof(struct pt_regs, event));
+ DEFINE(PT_event, offsetof(struct pt_regs, ecr));
DEFINE(PT_bta, offsetof(struct pt_regs, bta));
DEFINE(PT_sp, offsetof(struct pt_regs, sp));
DEFINE(PT_r0, offsetof(struct pt_regs, r0));
diff --git a/arch/arc/kernel/kgdb.c b/arch/arc/kernel/kgdb.c
index 345a0000554c..4f2b5951454f 100644
--- a/arch/arc/kernel/kgdb.c
+++ b/arch/arc/kernel/kgdb.c
@@ -175,7 +175,7 @@ void kgdb_trap(struct pt_regs *regs)
* with trap_s 4 (compiled) breakpoints, continuation needs to
* start after the breakpoint.
*/
- if (regs->ecr_param == 3)
+ if (regs->ecr.param == 3)
instruction_pointer(regs) -= BREAK_INSTR_SIZE;

kgdb_handle_exception(1, SIGTRAP, 0, regs);
diff --git a/arch/arc/kernel/ptrace.c b/arch/arc/kernel/ptrace.c
index 14ea7406f5cd..e0c233c178b1 100644
--- a/arch/arc/kernel/ptrace.c
+++ b/arch/arc/kernel/ptrace.c
@@ -46,7 +46,7 @@ static const struct pt_regs_offset regoffset_table[] = {
REG_OFFSET_NAME(r0),
REG_OFFSET_NAME(sp),
REG_OFFSET_NAME(orig_r0),
- REG_OFFSET_NAME(event),
+ REG_OFFSET_NAME(ecr),
REG_OFFSET_END,
};

@@ -54,7 +54,7 @@ static const struct pt_regs_offset regoffset_table[] = {

static const struct pt_regs_offset regoffset_table[] = {
REG_OFFSET_NAME(orig_r0),
- REG_OFFSET_NAME(event),
+ REG_OFFSET_NAME(ecr),
REG_OFFSET_NAME(bta),
REG_OFFSET_NAME(r26),
REG_OFFSET_NAME(fp),
diff --git a/arch/arc/kernel/traps.c b/arch/arc/kernel/traps.c
index 2f7eb786695b..9b9570b79362 100644
--- a/arch/arc/kernel/traps.c
+++ b/arch/arc/kernel/traps.c
@@ -110,9 +110,7 @@ void do_machine_check_fault(unsigned long address, struct pt_regs *regs)
*/
void do_non_swi_trap(unsigned long address, struct pt_regs *regs)
{
- unsigned int param = regs->ecr_param;
-
- switch (param) {
+ switch (regs->ecr.param) {
case 1:
trap_is_brkpt(address, regs);
break;
diff --git a/arch/arc/kernel/troubleshoot.c b/arch/arc/kernel/troubleshoot.c
index 7654c2e42dc0..d5b3ed2c58f5 100644
--- a/arch/arc/kernel/troubleshoot.c
+++ b/arch/arc/kernel/troubleshoot.c
@@ -115,8 +115,8 @@ static void show_ecr_verbose(struct pt_regs *regs)
/* For Data fault, this is data address not instruction addr */
address = current->thread.fault_address;

- vec = regs->ecr_vec;
- cause_code = regs->ecr_cause;
+ vec = regs->ecr.vec;
+ cause_code = regs->ecr.cause;

/* For DTLB Miss or ProtV, display the memory involved too */
if (vec == ECR_V_DTLB_MISS) {
@@ -154,7 +154,7 @@ static void show_ecr_verbose(struct pt_regs *regs)
pr_cont("Misaligned r/w from 0x%08lx\n", address);
#endif
} else if (vec == ECR_V_TRAP) {
- if (regs->ecr_param == 5)
+ if (regs->ecr.param == 5)
pr_cont("gcc generated __builtin_trap\n");
} else {
pr_cont("Check Programmer's Manual\n");
@@ -184,9 +184,10 @@ void show_regs(struct pt_regs *regs)
if (user_mode(regs))
show_faulting_vma(regs->ret); /* faulting code, not data */

- pr_info("ECR: 0x%08lx EFA: 0x%08lx ERET: 0x%08lx\nSTAT: 0x%08lx",
- regs->event, current->thread.fault_address, regs->ret,
- regs->status32);
+ pr_info("ECR: 0x%08lx EFA: 0x%08lx ERET: 0x%08lx\n",
+ regs->ecr.full, current->thread.fault_address, regs->ret);
+
+ pr_info("STAT32: 0x%08lx", regs->status32);

#define STS_BIT(r, bit) r->status32 & STATUS_##bit##_MASK ? #bit" " : ""

diff --git a/arch/arc/mm/fault.c b/arch/arc/mm/fault.c
index 26e5823c5710..95119a5e7761 100644
--- a/arch/arc/mm/fault.c
+++ b/arch/arc/mm/fault.c
@@ -100,10 +100,10 @@ void do_page_fault(unsigned long address, struct pt_regs *regs)
if (faulthandler_disabled() || !mm)
goto no_context;

- if (regs->ecr_cause & ECR_C_PROTV_STORE) /* ST/EX */
+ if (regs->ecr.cause & ECR_C_PROTV_STORE) /* ST/EX */
write = 1;
- else if ((regs->ecr_vec == ECR_V_PROTV) &&
- (regs->ecr_cause == ECR_C_PROTV_INST_FETCH))
+ else if ((regs->ecr.vec == ECR_V_PROTV) &&
+ (regs->ecr.cause == ECR_C_PROTV_INST_FETCH))
exec = 1;

flags = FAULT_FLAG_DEFAULT;
--
2.34.1