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x86: fix #968. also fix potential bug of not clearing high bytes when updateing EIP

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Backports commit 4d0157eb4a4891fe9101ac84accbd11cd4277794 from qemu
This commit is contained in:
Nguyen Anh Quynh 2018-09-03 07:58:09 -04:00 committed by Lioncash
parent 80b94a546f
commit d149648f2f
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GPG key ID: 4E3C3CC1031BA9C7
2 changed files with 11 additions and 4 deletions
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4
qemu/target/i386/unicorn.c
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@ -973,7 +973,7 @@ int x86_reg_write(struct uc_struct *uc, unsigned int *regs, void *const *vals, i
uc_emu_stop(uc);
break;
case UC_X86_REG_IP:
WRITE_WORD(state->eip, *(uint16_t *)value);
X86_CPU(uc, mycpu)->env.eip = *(uint16_t *)value;
// force to quit execution and flush TB
uc->quit_request = true;
uc_emu_stop(uc);
@ -1163,7 +1163,7 @@ int x86_reg_write(struct uc_struct *uc, unsigned int *regs, void *const *vals, i
uc_emu_stop(uc);
break;
case UC_X86_REG_EIP:
WRITE_DWORD(state->eip, *(uint32_t *)value);
X86_CPU(uc, mycpu)->env.eip = *(uint32_t *)value;
// force to quit execution and flush TB
uc->quit_request = true;
uc_emu_stop(uc);

11
uc.c
View file

@ -549,9 +549,16 @@ uc_err uc_emu_start(uc_engine* uc, uint64_t begin, uint64_t until, uint64_t time
switch(uc->mode) {
default:
break;
case UC_MODE_16:
uc_reg_write(uc, UC_X86_REG_IP, &begin);
case UC_MODE_16: {
uint64_t ip;
uint16_t cs;
uc_reg_read(uc, UC_X86_REG_CS, &cs);
// compensate for later adding up IP & CS
ip = begin - cs*16;
uc_reg_write(uc, UC_X86_REG_IP, &ip);
break;
}
case UC_MODE_32:
uc_reg_write(uc, UC_X86_REG_EIP, &begin);
break;