* [PATCH] sh: use opcode_t and enable unaligned code for sh2a
@ 2008-02-07 11:04 Magnus Damm
0 siblings, 0 replies; only message in thread
From: Magnus Damm @ 2008-02-07 11:04 UTC (permalink / raw)
To: linux-sh
This patch converts the unaligned access handling code to use opcode_t
instead of u16. While at it, enable unaligned access handling for sh2a.
Signed-off-by: Magnus Damm <damm@igel.co.jp>
---
arch/sh/kernel/traps_32.c | 59 +++++++++++++++++++--------------------------
1 file changed, 25 insertions(+), 34 deletions(-)
--- 0003/arch/sh/kernel/traps_32.c
+++ work/arch/sh/kernel/traps_32.c 2008-02-07 16:01:35.000000000 +0900
@@ -179,7 +179,7 @@ static inline void sign_extend(unsigned
* (if that instruction is in a branch delay slot)
* - return 0 if emulation okay, -EFAULT on existential error
*/
-static int handle_unaligned_ins(u16 instruction, struct pt_regs *regs)
+static int handle_unaligned_ins(opcode_t instruction, struct pt_regs *regs)
{
int ret, index, count;
unsigned long *rm, *rn;
@@ -320,11 +320,13 @@ static int handle_unaligned_ins(u16 inst
* emulate the instruction in the delay slot
* - fetches the instruction from PC+2
*/
-static inline int handle_unaligned_delayslot(struct pt_regs *regs)
+static inline int handle_unaligned_delayslot(struct pt_regs *regs,
+ opcode_t old_instruction)
{
- u16 instruction;
+ opcode_t instruction;
+ void *addr = (void *)(regs->pc + instruction_size(old_instruction));
- if (copy_from_user(&instruction, (u16 *)(regs->pc+2), 2)) {
+ if (copy_from_user(&instruction, addr, sizeof(instruction))) {
/* the instruction-fetch faulted */
if (user_mode(regs))
return -EFAULT;
@@ -334,7 +336,7 @@ static inline int handle_unaligned_delay
regs, 0);
}
- return handle_unaligned_ins(instruction,regs);
+ return handle_unaligned_ins(instruction, regs);
}
/*
@@ -357,10 +359,10 @@ static inline int handle_unaligned_delay
* XXX: SH-2A needs this too, but it needs an overhaul thanks to mixed 32-bit
* opcodes..
*/
-#ifndef CONFIG_CPU_SH2A
+
static int handle_unaligned_notify_count = 10;
-static int handle_unaligned_access(u16 instruction, struct pt_regs *regs)
+static int handle_unaligned_access(opcode_t instruction, struct pt_regs *regs)
{
u_int rm;
int ret, index;
@@ -375,7 +377,7 @@ static int handle_unaligned_access(u16 i
printk(KERN_NOTICE "Fixing up unaligned userspace access "
"in \"%s\" pid=%d pc=0x%p ins=0x%04hx\n",
current->comm, task_pid_nr(current),
- (u16 *)regs->pc, instruction);
+ (void *)regs->pc, instruction);
}
ret = -EFAULT;
@@ -383,19 +385,19 @@ static int handle_unaligned_access(u16 i
case 0x0000:
if (instruction=0x000B) {
/* rts */
- ret = handle_unaligned_delayslot(regs);
+ ret = handle_unaligned_delayslot(regs, instruction);
if (ret=0)
regs->pc = regs->pr;
}
else if ((instruction&0x00FF)=0x0023) {
/* braf @Rm */
- ret = handle_unaligned_delayslot(regs);
+ ret = handle_unaligned_delayslot(regs, instruction);
if (ret=0)
regs->pc += rm + 4;
}
else if ((instruction&0x00FF)=0x0003) {
/* bsrf @Rm */
- ret = handle_unaligned_delayslot(regs);
+ ret = handle_unaligned_delayslot(regs, instruction);
if (ret=0) {
regs->pr = regs->pc + 4;
regs->pc += rm + 4;
@@ -416,13 +418,13 @@ static int handle_unaligned_access(u16 i
case 0x4000:
if ((instruction&0x00FF)=0x002B) {
/* jmp @Rm */
- ret = handle_unaligned_delayslot(regs);
+ ret = handle_unaligned_delayslot(regs, instruction);
if (ret=0)
regs->pc = rm;
}
else if ((instruction&0x00FF)=0x000B) {
/* jsr @Rm */
- ret = handle_unaligned_delayslot(regs);
+ ret = handle_unaligned_delayslot(regs, instruction);
if (ret=0) {
regs->pr = regs->pc + 4;
regs->pc = rm;
@@ -449,7 +451,7 @@ static int handle_unaligned_access(u16 i
case 0x0B00: /* bf lab - no delayslot*/
break;
case 0x0F00: /* bf/s lab */
- ret = handle_unaligned_delayslot(regs);
+ ret = handle_unaligned_delayslot(regs, instruction);
if (ret=0) {
#if defined(CONFIG_CPU_SH4) || defined(CONFIG_SH7705_CACHE_32KB)
if ((regs->sr & 0x00000001) != 0)
@@ -462,7 +464,7 @@ static int handle_unaligned_access(u16 i
case 0x0900: /* bt lab - no delayslot */
break;
case 0x0D00: /* bt/s lab */
- ret = handle_unaligned_delayslot(regs);
+ ret = handle_unaligned_delayslot(regs, instruction);
if (ret=0) {
#if defined(CONFIG_CPU_SH4) || defined(CONFIG_SH7705_CACHE_32KB)
if ((regs->sr & 0x00000001) = 0)
@@ -476,13 +478,13 @@ static int handle_unaligned_access(u16 i
break;
case 0xA000: /* bra label */
- ret = handle_unaligned_delayslot(regs);
+ ret = handle_unaligned_delayslot(regs, instruction);
if (ret=0)
regs->pc += SH_PC_12BIT_OFFSET(instruction);
break;
case 0xB000: /* bsr label */
- ret = handle_unaligned_delayslot(regs);
+ ret = handle_unaligned_delayslot(regs, instruction);
if (ret=0) {
regs->pr = regs->pc + 4;
regs->pc += SH_PC_12BIT_OFFSET(instruction);
@@ -493,12 +495,11 @@ static int handle_unaligned_access(u16 i
/* handle non-delay-slot instruction */
simple:
- ret = handle_unaligned_ins(instruction,regs);
+ ret = handle_unaligned_ins(instruction, regs);
if (ret=0)
regs->pc += instruction_size(instruction);
return ret;
}
-#endif /* CONFIG_CPU_SH2A */
#ifdef CONFIG_CPU_HAS_SR_RB
#define lookup_exception_vector(x) \
@@ -526,10 +527,8 @@ asmlinkage void do_address_error(struct
unsigned long error_code = 0;
mm_segment_t oldfs;
siginfo_t info;
-#ifndef CONFIG_CPU_SH2A
- u16 instruction;
+ opcode_t instruction;
int tmp;
-#endif
/* Intentional ifdef */
#ifdef CONFIG_CPU_HAS_SR_RB
@@ -549,9 +548,9 @@ asmlinkage void do_address_error(struct
goto uspace_segv;
}
-#ifndef CONFIG_CPU_SH2A
set_fs(USER_DS);
- if (copy_from_user(&instruction, (u16 *)(regs->pc), 2)) {
+ if (copy_from_user(&instruction, (void *)(regs->pc),
+ sizeof(instruction))) {
/* Argh. Fault on the instruction itself.
This should never happen non-SMP
*/
@@ -564,8 +563,6 @@ asmlinkage void do_address_error(struct
if (tmp=0)
return; /* sorted */
-#endif
-
uspace_segv:
printk(KERN_NOTICE "Sending SIGBUS to \"%s\" due to unaligned "
"access (PC %lx PR %lx)\n", current->comm, regs->pc,
@@ -580,9 +577,9 @@ uspace_segv:
if (regs->pc & 1)
die("unaligned program counter", regs, error_code);
-#ifndef CONFIG_CPU_SH2A
set_fs(KERNEL_DS);
- if (copy_from_user(&instruction, (u16 *)(regs->pc), 2)) {
+ if (copy_from_user(&instruction, (void *)(regs->pc),
+ sizeof(instruction))) {
/* Argh. Fault on the instruction itself.
This should never happen non-SMP
*/
@@ -592,12 +589,6 @@ uspace_segv:
handle_unaligned_access(instruction, regs);
set_fs(oldfs);
-#else
- printk(KERN_NOTICE "Killing process \"%s\" due to unaligned "
- "access\n", current->comm);
-
- force_sig(SIGSEGV, current);
-#endif
}
}
^ permalink raw reply [flat|nested] only message in thread
only message in thread, other threads:[~2008-02-07 11:04 UTC | newest]
Thread overview: (only message) (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2008-02-07 11:04 [PATCH] sh: use opcode_t and enable unaligned code for sh2a Magnus Damm
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.