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cpu-exec: Move interrupt handling out of cpu_exec()

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Simplify cpu_exec() by extracting interrupt handling code outside of
cpu_exec() into a new static inline function cpu_handle_interrupt().

Backports commit c385e6e49763c6dd5dbbd90fadde95d986f8bd38 from qemu
This commit is contained in:
Sergey Fedorov 2018-02-24 00:08:24 -05:00 committed by Lioncash
parent c1b52a4387
commit d4ef96abf2
No known key found for this signature in database
GPG key ID: 4E3C3CC1031BA9C7
1 changed files with 59 additions and 52 deletions
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97
qemu/cpu-exec.c
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@ -258,50 +258,11 @@ static inline bool cpu_handle_exception(struct uc_struct *uc, CPUState *cpu, int
return false;
}
/* main execution loop */
int cpu_exec(struct uc_struct *uc, CPUState *cpu)
static inline void cpu_handle_interrupt(CPUState *cpu,
TranslationBlock **last_tb)
{
CPUArchState *env = cpu->env_ptr;
CPUClass *cc = CPU_GET_CLASS(uc, cpu);
#ifdef TARGET_I386
X86CPU *x86_cpu = X86_CPU(uc, cpu);
#endif
int ret, interrupt_request;
TranslationBlock *tb, *last_tb;
int tb_exit = 0;
if (cpu_handle_halt(cpu)) {
return EXCP_HALTED;
}
uc->current_cpu = cpu;
atomic_mb_set(&uc->tcg_current_cpu, cpu);
if (unlikely(atomic_mb_read(&uc->exit_request))) {
cpu->exit_request = 1;
}
cc->cpu_exec_enter(cpu);
cpu->exception_index = -1;
env->invalid_error = UC_ERR_OK;
for(;;) {
/* prepare setjmp context for exception handling */
if (sigsetjmp(cpu->jmp_env, 0) == 0) {
if (uc->stop_request || uc->invalid_error) {
break;
}
/* if an exception is pending, we execute it here */
if (cpu_handle_exception(uc, cpu, &ret)) {
break;
}
last_tb = NULL; /* forget the last executed TB after exception */
cpu->tb_flushed = false; /* reset before first TB lookup */
for(;;) {
interrupt_request = cpu->interrupt_request;
CPUClass *cc = CPU_GET_CLASS(cpu->uc, cpu);
int interrupt_request = cpu->interrupt_request;
if (unlikely(interrupt_request)) {
if (unlikely(cpu->singlestep_enabled & SSTEP_NOIRQ)) {
@ -336,7 +297,7 @@ int cpu_exec(struct uc_struct *uc, CPUState *cpu)
True when it is, and we should restart on a new TB,
and via longjmp via cpu_loop_exit. */
if (cc->cpu_exec_interrupt(cpu, interrupt_request)) {
last_tb = NULL;
*last_tb = NULL;
}
/* Don't use the cached interrupt_request value,
do_interrupt may have updated the EXITTB flag. */
@ -344,7 +305,7 @@ int cpu_exec(struct uc_struct *uc, CPUState *cpu)
cpu->interrupt_request &= ~CPU_INTERRUPT_EXITTB;
/* ensure that no TB jump will be modified as
the program flow was changed */
last_tb = NULL;
*last_tb = NULL;
}
}
if (unlikely(cpu->exit_request)) {
@ -352,6 +313,52 @@ int cpu_exec(struct uc_struct *uc, CPUState *cpu)
cpu->exception_index = EXCP_INTERRUPT;
cpu_loop_exit(cpu);
}
}
/* main execution loop */
int cpu_exec(struct uc_struct *uc, CPUState *cpu)
{
CPUArchState *env = cpu->env_ptr;
CPUClass *cc = CPU_GET_CLASS(uc, cpu);
#ifdef TARGET_I386
X86CPU *x86_cpu = X86_CPU(uc, cpu);
#endif
int ret;
TranslationBlock *tb, *last_tb;
int tb_exit = 0;
if (cpu_handle_halt(cpu)) {
return EXCP_HALTED;
}
uc->current_cpu = cpu;
atomic_mb_set(&uc->tcg_current_cpu, cpu);
if (unlikely(atomic_mb_read(&uc->exit_request))) {
cpu->exit_request = 1;
}
cc->cpu_exec_enter(cpu);
cpu->exception_index = -1;
env->invalid_error = UC_ERR_OK;
for(;;) {
/* prepare setjmp context for exception handling */
if (sigsetjmp(cpu->jmp_env, 0) == 0) {
if (uc->stop_request || uc->invalid_error) {
break;
}
/* if an exception is pending, we execute it here */
if (cpu_handle_exception(uc, cpu, &ret)) {
break;
}
last_tb = NULL; /* forget the last executed TB after exception */
cpu->tb_flushed = false; /* reset before first TB lookup */
for(;;) {
cpu_handle_interrupt(cpu, &last_tb);
tb = tb_find_fast(cpu, &last_tb, tb_exit);
if (!tb) { // invalid TB due to invalid code?
uc->invalid_error = UC_ERR_FETCH_UNMAPPED;