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CR0.MP/EM/TS support - native fpu support in code copy mode

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git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@640 c046a42c-6fe2-441c-8c8c-71466251a162
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bellard 2004-02-25 23:15:55 +00:00
parent 2edcdce334
commit 9588b95a08
1 changed files with 73 additions and 0 deletions
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73
target-i386/helper2.c
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@ -267,6 +267,9 @@ void cpu_x86_update_cr0(CPUX86State *env, uint32_t new_cr0)
env->hflags = (env->hflags & ~HF_PE_MASK) | (pe_state << HF_PE_SHIFT);
/* ensure that ADDSEG is always set in real mode */
env->hflags |= ((pe_state ^ 1) << HF_ADDSEG_SHIFT);
/* update FPU flags */
env->hflags = (env->hflags & ~(HF_MP_MASK | HF_EM_MASK | HF_TS_MASK)) |
((new_cr0 << (HF_MP_SHIFT - 1)) & (HF_MP_MASK | HF_EM_MASK | HF_TS_MASK));
}
void cpu_x86_update_cr3(CPUX86State *env, uint32_t new_cr3)
@ -476,3 +479,73 @@ target_ulong cpu_get_phys_page_debug(CPUState *env, target_ulong addr)
return paddr;
}
#endif
#if defined(USE_CODE_COPY)
struct fpstate {
uint16_t fpuc;
uint16_t dummy1;
uint16_t fpus;
uint16_t dummy2;
uint16_t fptag;
uint16_t dummy3;
uint32_t fpip;
uint32_t fpcs;
uint32_t fpoo;
uint32_t fpos;
uint8_t fpregs1[8 * 10];
};
void restore_native_fp_state(CPUState *env)
{
int fptag, i, j;
struct fpstate fp1, *fp = &fp1;
fp->fpuc = env->fpuc;
fp->fpus = (env->fpus & ~0x3800) | (env->fpstt & 0x7) << 11;
fptag = 0;
for (i=7; i>=0; i--) {
fptag <<= 2;
if (env->fptags[i]) {
fptag |= 3;
} else {
/* the FPU automatically computes it */
}
}
fp->fptag = fptag;
j = env->fpstt;
for(i = 0;i < 8; i++) {
memcpy(&fp->fpregs1[i * 10], &env->fpregs[j], 10);
j = (j + 1) & 7;
}
asm volatile ("frstor %0" : "=m" (*fp));
env->native_fp_regs = 1;
}
void save_native_fp_state(CPUState *env)
{
int fptag, i, j;
uint16_t fpuc;
struct fpstate fp1, *fp = &fp1;
asm volatile ("fsave %0" : : "m" (*fp));
env->fpuc = fp->fpuc;
env->fpstt = (fp->fpus >> 11) & 7;
env->fpus = fp->fpus & ~0x3800;
fptag = fp->fptag;
for(i = 0;i < 8; i++) {
env->fptags[i] = ((fptag & 3) == 3);
fptag >>= 2;
}
j = env->fpstt;
for(i = 0;i < 8; i++) {
memcpy(&env->fpregs[j], &fp->fpregs1[i * 10], 10);
j = (j + 1) & 7;
}
/* we must restore the default rounding state */
/* XXX: we do not restore the exception state */
fpuc = 0x037f | (env->fpuc & (3 << 10));
asm volatile("fldcw %0" : : "m" (fpuc));
env->native_fp_regs = 0;
}
#endif