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target-sh4: optimize exceptions

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As exception is not the normal path, don't bother saving PC, before
raising one, instead rely on code retranslation to get the CPU state.

Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
This commit is contained in:
Aurelien Jarno 2011-01-14 20:39:18 +01:00
parent 17075f10ff
commit fd4bab102c
2 changed files with 12 additions and 15 deletions
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22
target-sh4/op_helper.c
View File

@ -83,28 +83,31 @@ void helper_ldtlb(void)
#endif
}
static inline void raise_exception(int index, void *retaddr)
{
env->exception_index = index;
cpu_restore_state_from_retaddr(retaddr);
cpu_loop_exit();
}
void helper_raise_illegal_instruction(void)
{
env->exception_index = 0x180;
cpu_loop_exit();
raise_exception(0x180, GETPC());
}
void helper_raise_slot_illegal_instruction(void)
{
env->exception_index = 0x1a0;
cpu_loop_exit();
raise_exception(0x1a0, GETPC());
}
void helper_raise_fpu_disable(void)
{
env->exception_index = 0x800;
cpu_loop_exit();
raise_exception(0x800, GETPC());
}
void helper_raise_slot_fpu_disable(void)
{
env->exception_index = 0x820;
cpu_loop_exit();
raise_exception(0x820, GETPC());
}
void helper_debug(void)
@ -124,8 +127,7 @@ void helper_sleep(uint32_t next_pc)
void helper_trapa(uint32_t tra)
{
env->tra = tra << 2;
env->exception_index = 0x160;
cpu_loop_exit();
raise_exception(0x160, GETPC());
}
void helper_movcal(uint32_t address, uint32_t value)

5
target-sh4/translate.c
View File

@ -471,7 +471,6 @@ static inline void gen_store_fpr64 (TCGv_i64 t, int reg)
#define CHECK_NOT_DELAY_SLOT \
if (ctx->flags & (DELAY_SLOT | DELAY_SLOT_CONDITIONAL)) \
{ \
tcg_gen_movi_i32(cpu_pc, ctx->pc); \
gen_helper_raise_slot_illegal_instruction(); \
ctx->bstate = BS_EXCP; \
return; \
@ -479,7 +478,6 @@ static inline void gen_store_fpr64 (TCGv_i64 t, int reg)
#define CHECK_PRIVILEGED \
if (IS_USER(ctx)) { \
tcg_gen_movi_i32(cpu_pc, ctx->pc); \
if (ctx->flags & (DELAY_SLOT | DELAY_SLOT_CONDITIONAL)) { \
gen_helper_raise_slot_illegal_instruction(); \
} else { \
@ -491,7 +489,6 @@ static inline void gen_store_fpr64 (TCGv_i64 t, int reg)
#define CHECK_FPU_ENABLED \
if (ctx->flags & SR_FD) { \
tcg_gen_movi_i32(cpu_pc, ctx->pc); \
if (ctx->flags & (DELAY_SLOT | DELAY_SLOT_CONDITIONAL)) { \
gen_helper_raise_slot_fpu_disable(); \
} else { \
@ -1380,7 +1377,6 @@ static void _decode_opc(DisasContext * ctx)
{
TCGv imm;
CHECK_NOT_DELAY_SLOT
tcg_gen_movi_i32(cpu_pc, ctx->pc);
imm = tcg_const_i32(B7_0);
gen_helper_trapa(imm);
tcg_temp_free(imm);
@ -1888,7 +1884,6 @@ static void _decode_opc(DisasContext * ctx)
ctx->opcode, ctx->pc);
fflush(stderr);
#endif
tcg_gen_movi_i32(cpu_pc, ctx->pc);
if (ctx->flags & (DELAY_SLOT | DELAY_SLOT_CONDITIONAL)) {
gen_helper_raise_slot_illegal_instruction();
} else {