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FPU control word and tags

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This commit is contained in:
feliam
2016-03-09 19:14:33 -03:00
parent a5f2a64de5
commit 0a3799eada
3 changed files with 53 additions and 6 deletions
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52
qemu/target-i386/unicorn.c
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@@ -152,10 +152,42 @@ int x86_reg_read(struct uc_struct *uc, unsigned int regid, void *value)
case UC_X86_REG_FPSW:
{
uint16_t fpus = X86_CPU(uc, mycpu)->env.fpus;
fpus = fpus & ~(7<<11);
fpus |= (X86_CPU(uc, mycpu)->env.fpstt&7)<<11;
fpus = fpus & ~0x3800;
fpus |= ( X86_CPU(uc, mycpu)->env.fpstt & 0x7 ) << 11;
*(uint16_t*) value = fpus;
}
case UC_X86_REG_FPCW:
*(uint16_t*) value = X86_CPU(uc, mycpu)->env.fpuc;
break;
case UC_X86_REG_FPTAG:
{
#define EXPD(fp) (fp.l.upper & 0x7fff)
#define MANTD(fp) (fp.l.lower)
#define MAXEXPD 0x7fff
int fptag, exp, i;
uint64_t mant;
CPU_LDoubleU tmp;
fptag = 0;
for (i = 7; i >= 0; i--) {
fptag <<= 2;
if (X86_CPU(uc, mycpu)->env.fptags[i]) {
fptag |= 3;
} else {
tmp.d = X86_CPU(uc, mycpu)->env.fpregs[i].d;
exp = EXPD(tmp);
mant = MANTD(tmp);
if (exp == 0 && mant == 0) {
/* zero */
fptag |= 1;
} else if (exp == 0 || exp == MAXEXPD
|| (mant & (1LL << 63)) == 0) {
/* NaNs, infinity, denormal */
fptag |= 2;
}
}
}
*(uint16_t*) value = fptag;
}
break;
}
@@ -606,10 +638,22 @@ int x86_reg_write(struct uc_struct *uc, unsigned int regid, const void *value)
case UC_X86_REG_FPSW:
{
uint16_t fpus = *(uint16_t*) value;
X86_CPU(uc, mycpu)->env.fpus = fpus;
X86_CPU(uc, mycpu)->env.fpstt = (fpus>>11)&7;
X86_CPU(uc, mycpu)->env.fpus = fpus & ~0x3800;
X86_CPU(uc, mycpu)->env.fpstt = (fpus >> 11) & 0x7;
}
break;
case UC_X86_REG_FPCW:
*(uint16_t*) value = X86_CPU(uc, mycpu)->env.fpuc;
break;
case UC_X86_REG_FPTAG:
{
int i;
uint16_t fptag = *(uint16_t*) value;
for (i = 0; i < 8; i++) {
X86_CPU(uc, mycpu)->env.fptags[i] = ((fptag & 3) == 3);
fptag >>= 2;
}
}
}
switch(uc->mode) {