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x86: return immediately after handling FPSW/FPCW/FPTAG registers

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This commit is contained in:
Nguyen Anh Quynh 2016-03-20 18:15:41 +08:00
parent ad6bb8c9f8
commit 859111f8f5
1 changed files with 9 additions and 7 deletions
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16
qemu/target-i386/unicorn.c
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@ -148,7 +148,7 @@ int x86_reg_read(struct uc_struct *uc, unsigned int regid, void *value)
floatx80 reg = X86_CPU(uc, mycpu)->env.fpregs[regid - UC_X86_REG_FP0].d;
cpu_get_fp80(value, value+sizeof(uint64_t), reg);
}
break;
return 0;
case UC_X86_REG_FPSW:
{
uint16_t fpus = X86_CPU(uc, mycpu)->env.fpus;
@ -156,10 +156,10 @@ int x86_reg_read(struct uc_struct *uc, unsigned int regid, void *value)
fpus |= ( X86_CPU(uc, mycpu)->env.fpstt & 0x7 ) << 11;
*(uint16_t*) value = fpus;
}
break;
return 0;
case UC_X86_REG_FPCW:
*(uint16_t*) value = X86_CPU(uc, mycpu)->env.fpuc;
break;
return 0;
case UC_X86_REG_FPTAG:
{
#define EXPD(fp) (fp.l.upper & 0x7fff)
@ -189,7 +189,7 @@ int x86_reg_read(struct uc_struct *uc, unsigned int regid, void *value)
}
*(uint16_t*) value = fptag;
}
break;
return 0;
}
switch(uc->mode) {
@ -634,17 +634,17 @@ int x86_reg_write(struct uc_struct *uc, unsigned int regid, const void *value)
uint16_t upper = *(uint16_t*) (value + sizeof(uint64_t));
X86_CPU(uc, mycpu)->env.fpregs[regid - UC_X86_REG_FP0].d = cpu_set_fp80(mant, upper);
}
break;
return 0;
case UC_X86_REG_FPSW:
{
uint16_t fpus = *(uint16_t*) value;
X86_CPU(uc, mycpu)->env.fpus = fpus & ~0x3800;
X86_CPU(uc, mycpu)->env.fpstt = (fpus >> 11) & 0x7;
}
break;
return 0;
case UC_X86_REG_FPCW:
X86_CPU(uc, mycpu)->env.fpuc = *(uint16_t *)value;
break;
return 0;
case UC_X86_REG_FPTAG:
{
int i;
@ -653,6 +653,8 @@ int x86_reg_write(struct uc_struct *uc, unsigned int regid, const void *value)
X86_CPU(uc, mycpu)->env.fptags[i] = ((fptag & 3) == 3);
fptag >>= 2;
}
return 0;
}
break;
}