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Better design of cpuid instruction hook

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lazymio
2021-12-22 20:36:56 +01:00
parent dfb14e971f
commit 7bb756249a
3 changed files with 27 additions and 9 deletions
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23
qemu/target/i386/misc_helper.c
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@@ -106,16 +106,10 @@ void helper_cpuid(CPUX86State *env)
{
uint32_t eax, ebx, ecx, edx;
struct hook *hook;
int skip_cpuid = 0;
cpu_svm_check_intercept_param(env, SVM_EXIT_CPUID, 0, GETPC());
cpu_x86_cpuid(env, (uint32_t)env->regs[R_EAX], (uint32_t)env->regs[R_ECX],
&eax, &ebx, &ecx, &edx);
env->regs[R_EAX] = eax;
env->regs[R_EBX] = ebx;
env->regs[R_ECX] = ecx;
env->regs[R_EDX] = edx;
// Unicorn: call registered CPUID hooks
HOOK_FOREACH_VAR_DECLARE;
HOOK_FOREACH(env->uc, hook, UC_HOOK_INSN) {
@@ -123,13 +117,26 @@ void helper_cpuid(CPUX86State *env)
continue;
if (!HOOK_BOUND_CHECK(hook, env->eip))
continue;
// Multiple cpuid callbacks returning different values is undefined.
// true -> skip the cpuid instruction
if (hook->insn == UC_X86_INS_CPUID)
((uc_cb_insn_syscall_t)hook->callback)(env->uc, hook->user_data);
skip_cpuid = ((uc_cb_insn_cpuid_t)hook->callback)(env->uc, hook->user_data);
// the last callback may already asked to stop emulation
if (env->uc->stop_request)
break;
}
if (!skip_cpuid) {
cpu_x86_cpuid(env, (uint32_t)env->regs[R_EAX], (uint32_t)env->regs[R_ECX],
&eax, &ebx, &ecx, &edx);
env->regs[R_EAX] = eax;
env->regs[R_EBX] = ebx;
env->regs[R_ECX] = ecx;
env->regs[R_EDX] = edx;
}
}
target_ulong helper_read_crN(CPUX86State *env, int reg)