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initialize ret=0 in cpu_exec(). issue #1115

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naq 2019-08-05 22:59:08 +08:00
parent 3eb3a18b56
commit 9208a6f317
1 changed files with 14 additions and 3 deletions
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17
qemu/cpu-exec.c
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@ -60,7 +60,7 @@ int cpu_exec(struct uc_struct *uc, CPUArchState *env) // qq
#ifdef TARGET_I386
X86CPU *x86_cpu = X86_CPU(uc, cpu);
#endif
int ret, interrupt_request;
int ret = 0, interrupt_request;
TranslationBlock *tb;
uint8_t *tc_ptr;
uintptr_t next_tb;
@ -96,8 +96,9 @@ int cpu_exec(struct uc_struct *uc, CPUArchState *env) // qq
/* prepare setjmp context for exception handling */
for(;;) {
if (sigsetjmp(cpu->jmp_env, 0) == 0) {
if (uc->stop_request || uc->invalid_error)
if (uc->stop_request || uc->invalid_error) {
break;
}
/* if an exception is pending, we execute it here */
if (cpu->exception_index >= 0) {
@ -117,6 +118,7 @@ int cpu_exec(struct uc_struct *uc, CPUArchState *env) // qq
}
break;
} else {
bool catched = false;
#if defined(CONFIG_USER_ONLY)
/* if user mode only, we simulate a fake exception
which will be handled outside the cpu execution
@ -127,13 +129,13 @@ int cpu_exec(struct uc_struct *uc, CPUArchState *env) // qq
ret = cpu->exception_index;
break;
#else
bool catched = false;
// Unicorn: call registered interrupt callbacks
HOOK_FOREACH_VAR_DECLARE;
HOOK_FOREACH(uc, hook, UC_HOOK_INTR) {
((uc_cb_hookintr_t)hook->callback)(uc, cpu->exception_index, hook->user_data);
catched = true;
}
// Unicorn: If un-catched interrupt, stop executions.
if (!catched) {
cpu->halted = 1;
@ -141,6 +143,7 @@ int cpu_exec(struct uc_struct *uc, CPUArchState *env) // qq
ret = EXCP_HLT;
break;
}
cpu->exception_index = -1;
#if defined(TARGET_X86_64)
if (env->exception_is_int) {
@ -164,11 +167,13 @@ int cpu_exec(struct uc_struct *uc, CPUArchState *env) // qq
/* Mask out external interrupts for this step. */
interrupt_request &= ~CPU_INTERRUPT_SSTEP_MASK;
}
if (interrupt_request & CPU_INTERRUPT_DEBUG) {
cpu->interrupt_request &= ~CPU_INTERRUPT_DEBUG;
cpu->exception_index = EXCP_DEBUG;
cpu_loop_exit(cpu);
}
if (interrupt_request & CPU_INTERRUPT_HALT) {
cpu->interrupt_request &= ~CPU_INTERRUPT_HALT;
cpu->halted = 1;
@ -194,6 +199,7 @@ int cpu_exec(struct uc_struct *uc, CPUArchState *env) // qq
if (cc->cpu_exec_interrupt(cpu, interrupt_request)) {
next_tb = 0;
}
/* Don't use the cached interrupt_request value,
do_interrupt may have updated the EXITTB flag. */
if (cpu->interrupt_request & CPU_INTERRUPT_EXITTB) {
@ -203,17 +209,20 @@ int cpu_exec(struct uc_struct *uc, CPUArchState *env) // qq
next_tb = 0;
}
}
if (unlikely(cpu->exit_request)) {
cpu->exit_request = 0;
cpu->exception_index = EXCP_INTERRUPT;
cpu_loop_exit(cpu);
}
tb = tb_find_fast(env); // qq
if (!tb) { // invalid TB due to invalid code?
uc->invalid_error = UC_ERR_FETCH_UNMAPPED;
ret = EXCP_HLT;
break;
}
/* Note: we do it here to avoid a gcc bug on Mac OS X when
doing it in tb_find_slow */
if (tcg_ctx->tb_ctx.tb_invalidated_flag) {
@ -223,6 +232,7 @@ int cpu_exec(struct uc_struct *uc, CPUArchState *env) // qq
next_tb = 0;
tcg_ctx->tb_ctx.tb_invalidated_flag = 0;
}
/* see if we can patch the calling TB. When the TB
spans two pages, we cannot safely do a direct
jump. */
@ -258,6 +268,7 @@ int cpu_exec(struct uc_struct *uc, CPUArchState *env) // qq
break;
}
}
cpu->current_tb = NULL;
/* reset soft MMU for next block (it can currently
only be set by a memory fault) */