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target-mips: change interrupt bits to be mips16-aware 

We need to stash the operating mode into the low bit of the error PC and
restore it on return from interrupts.

Signed-off-by: Nathan Froyd <froydnj@codesourcery.com>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
This commit is contained in:
Nathan Froyd 2009-12-08 08:06:23 -08:00 committed by Aurelien Jarno
parent 79ef2c4cdb
commit 32188a03da
2 changed files with 44 additions and 24 deletions
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51
target-mips/helper.c
View File

@ -369,6 +369,24 @@ static const char * const excp_names[EXCP_LAST + 1] = {
[EXCP_CACHE] = "cache error",
};
#if !defined(CONFIG_USER_ONLY)
static target_ulong exception_resume_pc (CPUState *env)
{
target_ulong bad_pc;
target_ulong isa_mode;
isa_mode = !!(env->hflags & MIPS_HFLAG_M16);
bad_pc = env->active_tc.PC | isa_mode;
if (env->hflags & MIPS_HFLAG_BMASK) {
/* If the exception was raised from a delay slot, come back to
the jump. */
bad_pc -= (env->hflags & MIPS_HFLAG_B16 ? 2 : 4);
}
return bad_pc;
}
#endif
void do_interrupt (CPUState *env)
{
#if !defined(CONFIG_USER_ONLY)
@ -396,7 +414,7 @@ void do_interrupt (CPUState *env)
resume will always occur on the next instruction
(but we assume the pc has always been updated during
code translation). */
env->CP0_DEPC = env->active_tc.PC;
env->CP0_DEPC = env->active_tc.PC | !!(env->hflags & MIPS_HFLAG_M16);
goto enter_debug_mode;
case EXCP_DINT:
env->CP0_Debug |= 1 << CP0DB_DINT;
@ -413,14 +431,8 @@ void do_interrupt (CPUState *env)
case EXCP_DDBL:
env->CP0_Debug |= 1 << CP0DB_DDBL;
set_DEPC:
if (env->hflags & MIPS_HFLAG_BMASK) {
/* If the exception was raised from a delay slot,
come back to the jump. */
env->CP0_DEPC = env->active_tc.PC - 4;
env->hflags &= ~MIPS_HFLAG_BMASK;
} else {
env->CP0_DEPC = env->active_tc.PC;
}
env->CP0_DEPC = exception_resume_pc(env);
env->hflags &= ~MIPS_HFLAG_BMASK;
enter_debug_mode:
env->hflags |= MIPS_HFLAG_DM | MIPS_HFLAG_64 | MIPS_HFLAG_CP0;
env->hflags &= ~(MIPS_HFLAG_KSU);
@ -428,6 +440,8 @@ void do_interrupt (CPUState *env)
if (!(env->CP0_Status & (1 << CP0St_EXL)))
env->CP0_Cause &= ~(1 << CP0Ca_BD);
env->active_tc.PC = (int32_t)0xBFC00480;
/* Exception handlers are entered in 32-bit mode. */
env->hflags &= ~(MIPS_HFLAG_M16);
break;
case EXCP_RESET:
cpu_reset(env);
@ -439,20 +453,16 @@ void do_interrupt (CPUState *env)
case EXCP_NMI:
env->CP0_Status |= (1 << CP0St_NMI);
set_error_EPC:
if (env->hflags & MIPS_HFLAG_BMASK) {
/* If the exception was raised from a delay slot,
come back to the jump. */
env->CP0_ErrorEPC = env->active_tc.PC - 4;
env->hflags &= ~MIPS_HFLAG_BMASK;
} else {
env->CP0_ErrorEPC = env->active_tc.PC;
}
env->CP0_ErrorEPC = exception_resume_pc(env);
env->hflags &= ~MIPS_HFLAG_BMASK;
env->CP0_Status |= (1 << CP0St_ERL) | (1 << CP0St_BEV);
env->hflags |= MIPS_HFLAG_64 | MIPS_HFLAG_CP0;
env->hflags &= ~(MIPS_HFLAG_KSU);
if (!(env->CP0_Status & (1 << CP0St_EXL)))
env->CP0_Cause &= ~(1 << CP0Ca_BD);
env->active_tc.PC = (int32_t)0xBFC00000;
/* Exception handlers are entered in 32-bit mode. */
env->hflags &= ~(MIPS_HFLAG_M16);
break;
case EXCP_EXT_INTERRUPT:
cause = 0;
@ -554,13 +564,10 @@ void do_interrupt (CPUState *env)
}
set_EPC:
if (!(env->CP0_Status & (1 << CP0St_EXL))) {
env->CP0_EPC = exception_resume_pc(env);
if (env->hflags & MIPS_HFLAG_BMASK) {
/* If the exception was raised from a delay slot,
come back to the jump. */
env->CP0_EPC = env->active_tc.PC - 4;
env->CP0_Cause |= (1 << CP0Ca_BD);
} else {
env->CP0_EPC = env->active_tc.PC;
env->CP0_Cause &= ~(1 << CP0Ca_BD);
}
env->CP0_Status |= (1 << CP0St_EXL);
@ -574,6 +581,8 @@ void do_interrupt (CPUState *env)
env->active_tc.PC = (int32_t)(env->CP0_EBase & ~0x3ff);
}
env->active_tc.PC += offset;
/* Exception handlers are entered in 32-bit mode. */
env->hflags &= ~(MIPS_HFLAG_M16);
env->CP0_Cause = (env->CP0_Cause & ~(0x1f << CP0Ca_EC)) | (cause << CP0Ca_EC);
break;
default:

17
target-mips/op_helper.c
View File

@ -1684,14 +1684,24 @@ static void debug_post_eret (void)
}
}
static void set_pc (target_ulong error_pc)
{
env->active_tc.PC = error_pc & ~(target_ulong)1;
if (error_pc & 1) {
env->hflags |= MIPS_HFLAG_M16;
} else {
env->hflags &= ~(MIPS_HFLAG_M16);
}
}
void helper_eret (void)
{
debug_pre_eret();
if (env->CP0_Status & (1 << CP0St_ERL)) {
env->active_tc.PC = env->CP0_ErrorEPC;
set_pc(env->CP0_ErrorEPC);
env->CP0_Status &= ~(1 << CP0St_ERL);
} else {
env->active_tc.PC = env->CP0_EPC;
set_pc(env->CP0_EPC);
env->CP0_Status &= ~(1 << CP0St_EXL);
}
compute_hflags(env);
@ -1702,7 +1712,8 @@ void helper_eret (void)
void helper_deret (void)
{
debug_pre_eret();
env->active_tc.PC = env->CP0_DEPC;
set_pc(env->CP0_DEPC);
env->hflags &= MIPS_HFLAG_DM;
compute_hflags(env);
debug_post_eret();