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sh: use opcode_t and enable unaligned code for sh2a 

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>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
This commit is contained in:
Magnus Damm 2008-02-07 20:04:12 +09:00 committed by Paul Mundt
parent 4252c659a4
commit 4b5a9ef527
1 changed files with 25 additions and 34 deletions
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59
arch/sh/kernel/traps_32.c
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@ -179,7 +179,7 @@ static inline void sign_extend(unsigned int count, unsigned char *dst)
* (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 instruction, struct pt_regs *regs)
* 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_delayslot(struct pt_regs *regs)
regs, 0);
}
return handle_unaligned_ins(instruction,regs);
return handle_unaligned_ins(instruction, regs);
}
/*
@ -357,10 +359,10 @@ static inline int handle_unaligned_delayslot(struct pt_regs *regs)
* 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 instruction, struct pt_regs *regs)
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 instruction, struct pt_regs *regs)
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 instruction, struct pt_regs *regs)
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 instruction, struct pt_regs *regs)
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 instruction, struct pt_regs *regs)
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 instruction, struct pt_regs *regs)
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 instruction, struct pt_regs *regs)
/* 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 pt_regs *regs,
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 pt_regs *regs,
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 pt_regs *regs,
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
}
}