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pop ss, mov ss, x and sti disable irqs for the next instruction - began dispatch optimization by adding new x86 cpu 'hidden' flags

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git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@372 c046a42c-6fe2-441c-8c8c-71466251a162
This commit is contained in:
bellard 2003-08-20 23:02:09 +00:00
parent d05e66d217
commit 3f33731662
8 changed files with 109 additions and 58 deletions
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26
cpu-exec.c
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@ -186,7 +186,8 @@ int cpu_exec(CPUState *env1)
#if defined(TARGET_I386)
/* if hardware interrupt pending, we execute it */
if ((interrupt_request & CPU_INTERRUPT_HARD) &&
(env->eflags & IF_MASK)) {
(env->eflags & IF_MASK) &&
!(env->hflags & HF_INHIBIT_IRQ_MASK)) {
int intno;
intno = cpu_x86_get_pic_interrupt(env);
if (loglevel) {
@ -233,21 +234,20 @@ int cpu_exec(CPUState *env1)
#endif
}
#endif
/* we compute the CPU state. We assume it will not
change during the whole generated block. */
/* we record a subset of the CPU state. It will
always be the same before a given translated block
is executed. */
#if defined(TARGET_I386)
flags = (env->segs[R_CS].flags & DESC_B_MASK)
>> (DESC_B_SHIFT - GEN_FLAG_CODE32_SHIFT);
>> (DESC_B_SHIFT - HF_CS32_SHIFT);
flags |= (env->segs[R_SS].flags & DESC_B_MASK)
>> (DESC_B_SHIFT - GEN_FLAG_SS32_SHIFT);
>> (DESC_B_SHIFT - HF_SS32_SHIFT);
flags |= (((unsigned long)env->segs[R_DS].base |
(unsigned long)env->segs[R_ES].base |
(unsigned long)env->segs[R_SS].base) != 0) <<
GEN_FLAG_ADDSEG_SHIFT;
flags |= env->cpl << GEN_FLAG_CPL_SHIFT;
flags |= env->soft_mmu << GEN_FLAG_SOFT_MMU_SHIFT;
flags |= (env->eflags & VM_MASK) >> (17 - GEN_FLAG_VM_SHIFT);
flags |= (env->eflags & (IOPL_MASK | TF_MASK));
HF_ADDSEG_SHIFT;
flags |= env->hflags;
flags |= (env->eflags & (IOPL_MASK | TF_MASK | VM_MASK));
cs_base = env->segs[R_CS].base;
pc = cs_base + env->eip;
#elif defined(TARGET_ARM)
@ -337,8 +337,8 @@ int cpu_exec(CPUState *env1)
/* reset soft MMU for next block (it can currently
only be set by a memory fault) */
#if defined(TARGET_I386) && !defined(CONFIG_SOFTMMU)
if (env->soft_mmu) {
env->soft_mmu = 0;
if (env->hflags & HF_SOFTMMU_MASK) {
env->hflags &= ~HF_SOFTMMU_MASK;
/* do not allow linking to another block */
T0 = 0;
}
@ -499,7 +499,7 @@ static inline int handle_cpu_signal(unsigned long pc, unsigned long address,
raise_exception_err(EXCP0E_PAGE, env->error_code);
} else {
/* activate soft MMU for this block */
env->soft_mmu = 1;
env->hflags |= HF_SOFTMMU_MASK;
sigprocmask(SIG_SETMASK, old_set, NULL);
cpu_loop_exit();
}