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Diffstat (limited to 'arch/sh/kernel/traps_32.c')
-rw-r--r--arch/sh/kernel/traps_32.c59
1 files changed, 34 insertions, 25 deletions
diff --git a/arch/sh/kernel/traps_32.c b/arch/sh/kernel/traps_32.c
index 25b1b8672cf..baa4fa368dc 100644
--- a/arch/sh/kernel/traps_32.c
+++ b/arch/sh/kernel/traps_32.c
@@ -172,6 +172,11 @@ static inline void sign_extend(unsigned int count, unsigned char *dst)
#endif
}
+static struct mem_access user_mem_access = {
+ copy_from_user,
+ copy_to_user,
+};
+
/*
* handle an instruction that does an unaligned memory access by emulating the
* desired behaviour
@@ -179,7 +184,8 @@ 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(opcode_t instruction, struct pt_regs *regs)
+static int handle_unaligned_ins(opcode_t instruction, struct pt_regs *regs,
+ struct mem_access *ma)
{
int ret, index, count;
unsigned long *rm, *rn;
@@ -206,7 +212,7 @@ static int handle_unaligned_ins(opcode_t instruction, struct pt_regs *regs)
#if !defined(__LITTLE_ENDIAN__)
dst += 4-count;
#endif
- if (copy_from_user(dst, src, count))
+ if (ma->from(dst, src, count))
goto fetch_fault;
sign_extend(count, dst);
@@ -219,7 +225,7 @@ static int handle_unaligned_ins(opcode_t instruction, struct pt_regs *regs)
dst = (unsigned char*) *rn;
dst += regs->regs[0];
- if (copy_to_user(dst, src, count))
+ if (ma->to(dst, src, count))
goto fetch_fault;
}
ret = 0;
@@ -230,7 +236,7 @@ static int handle_unaligned_ins(opcode_t instruction, struct pt_regs *regs)
dst = (unsigned char*) *rn;
dst += (instruction&0x000F)<<2;
- if (copy_to_user(dst,src,4))
+ if (ma->to(dst, src, 4))
goto fetch_fault;
ret = 0;
break;
@@ -243,7 +249,7 @@ static int handle_unaligned_ins(opcode_t instruction, struct pt_regs *regs)
#if !defined(__LITTLE_ENDIAN__)
src += 4-count;
#endif
- if (copy_to_user(dst, src, count))
+ if (ma->to(dst, src, count))
goto fetch_fault;
ret = 0;
break;
@@ -254,7 +260,7 @@ static int handle_unaligned_ins(opcode_t instruction, struct pt_regs *regs)
dst = (unsigned char*) rn;
*(unsigned long*)dst = 0;
- if (copy_from_user(dst,src,4))
+ if (ma->from(dst, src, 4))
goto fetch_fault;
ret = 0;
break;
@@ -269,7 +275,7 @@ static int handle_unaligned_ins(opcode_t instruction, struct pt_regs *regs)
#if !defined(__LITTLE_ENDIAN__)
dst += 4-count;
#endif
- if (copy_from_user(dst, src, count))
+ if (ma->from(dst, src, count))
goto fetch_fault;
sign_extend(count, dst);
ret = 0;
@@ -285,7 +291,7 @@ static int handle_unaligned_ins(opcode_t instruction, struct pt_regs *regs)
dst = (unsigned char*) *rm; /* called Rn in the spec */
dst += (instruction&0x000F)<<1;
- if (copy_to_user(dst, src, 2))
+ if (ma->to(dst, src, 2))
goto fetch_fault;
ret = 0;
break;
@@ -299,7 +305,7 @@ static int handle_unaligned_ins(opcode_t instruction, struct pt_regs *regs)
#if !defined(__LITTLE_ENDIAN__)
dst += 2;
#endif
- if (copy_from_user(dst, src, 2))
+ if (ma->from(dst, src, 2))
goto fetch_fault;
sign_extend(2, dst);
ret = 0;
@@ -320,8 +326,9 @@ static int handle_unaligned_ins(opcode_t 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,
- opcode_t old_instruction)
+static inline int handle_delayslot(struct pt_regs *regs,
+ opcode_t old_instruction,
+ struct mem_access *ma)
{
opcode_t instruction;
void *addr = (void *)(regs->pc + instruction_size(old_instruction));
@@ -336,7 +343,7 @@ static inline int handle_unaligned_delayslot(struct pt_regs *regs,
regs, 0);
}
- return handle_unaligned_ins(instruction, regs);
+ return handle_unaligned_ins(instruction, regs, ma);
}
/*
@@ -362,7 +369,8 @@ static inline int handle_unaligned_delayslot(struct pt_regs *regs,
static int handle_unaligned_notify_count = 10;
-static int handle_unaligned_access(opcode_t instruction, struct pt_regs *regs)
+int handle_unaligned_access(opcode_t instruction, struct pt_regs *regs,
+ struct mem_access *ma)
{
u_int rm;
int ret, index;
@@ -385,19 +393,19 @@ static int handle_unaligned_access(opcode_t instruction, struct pt_regs *regs)
case 0x0000:
if (instruction==0x000B) {
/* rts */
- ret = handle_unaligned_delayslot(regs, instruction);
+ ret = handle_delayslot(regs, instruction, ma);
if (ret==0)
regs->pc = regs->pr;
}
else if ((instruction&0x00FF)==0x0023) {
/* braf @Rm */
- ret = handle_unaligned_delayslot(regs, instruction);
+ ret = handle_delayslot(regs, instruction, ma);
if (ret==0)
regs->pc += rm + 4;
}
else if ((instruction&0x00FF)==0x0003) {
/* bsrf @Rm */
- ret = handle_unaligned_delayslot(regs, instruction);
+ ret = handle_delayslot(regs, instruction, ma);
if (ret==0) {
regs->pr = regs->pc + 4;
regs->pc += rm + 4;
@@ -418,13 +426,13 @@ static int handle_unaligned_access(opcode_t instruction, struct pt_regs *regs)
case 0x4000:
if ((instruction&0x00FF)==0x002B) {
/* jmp @Rm */
- ret = handle_unaligned_delayslot(regs, instruction);
+ ret = handle_delayslot(regs, instruction, ma);
if (ret==0)
regs->pc = rm;
}
else if ((instruction&0x00FF)==0x000B) {
/* jsr @Rm */
- ret = handle_unaligned_delayslot(regs, instruction);
+ ret = handle_delayslot(regs, instruction, ma);
if (ret==0) {
regs->pr = regs->pc + 4;
regs->pc = rm;
@@ -451,7 +459,7 @@ static int handle_unaligned_access(opcode_t instruction, struct pt_regs *regs)
case 0x0B00: /* bf lab - no delayslot*/
break;
case 0x0F00: /* bf/s lab */
- ret = handle_unaligned_delayslot(regs, instruction);
+ ret = handle_delayslot(regs, instruction, ma);
if (ret==0) {
#if defined(CONFIG_CPU_SH4) || defined(CONFIG_SH7705_CACHE_32KB)
if ((regs->sr & 0x00000001) != 0)
@@ -464,7 +472,7 @@ static int handle_unaligned_access(opcode_t instruction, struct pt_regs *regs)
case 0x0900: /* bt lab - no delayslot */
break;
case 0x0D00: /* bt/s lab */
- ret = handle_unaligned_delayslot(regs, instruction);
+ ret = handle_delayslot(regs, instruction, ma);
if (ret==0) {
#if defined(CONFIG_CPU_SH4) || defined(CONFIG_SH7705_CACHE_32KB)
if ((regs->sr & 0x00000001) == 0)
@@ -478,13 +486,13 @@ static int handle_unaligned_access(opcode_t instruction, struct pt_regs *regs)
break;
case 0xA000: /* bra label */
- ret = handle_unaligned_delayslot(regs, instruction);
+ ret = handle_delayslot(regs, instruction, ma);
if (ret==0)
regs->pc += SH_PC_12BIT_OFFSET(instruction);
break;
case 0xB000: /* bsr label */
- ret = handle_unaligned_delayslot(regs, instruction);
+ ret = handle_delayslot(regs, instruction, ma);
if (ret==0) {
regs->pr = regs->pc + 4;
regs->pc += SH_PC_12BIT_OFFSET(instruction);
@@ -495,7 +503,7 @@ static int handle_unaligned_access(opcode_t instruction, struct pt_regs *regs)
/* handle non-delay-slot instruction */
simple:
- ret = handle_unaligned_ins(instruction, regs);
+ ret = handle_unaligned_ins(instruction, regs, ma);
if (ret==0)
regs->pc += instruction_size(instruction);
return ret;
@@ -558,7 +566,8 @@ asmlinkage void do_address_error(struct pt_regs *regs,
goto uspace_segv;
}
- tmp = handle_unaligned_access(instruction, regs);
+ tmp = handle_unaligned_access(instruction, regs,
+ &user_mem_access);
set_fs(oldfs);
if (tmp==0)
@@ -587,7 +596,7 @@ uspace_segv:
die("insn faulting in do_address_error", regs, 0);
}
- handle_unaligned_access(instruction, regs);
+ handle_unaligned_access(instruction, regs, &user_mem_access);
set_fs(oldfs);
}
}
generated by cgit v1.2.3 (git 2.25.1) at 2024-07-13 11:06:18 +0000