diff options
| -rw-r--r-- | cpu-exec.c | 119 |
1 files changed, 64 insertions, 55 deletions
diff --git a/cpu-exec.c b/cpu-exec.c index c83b3540de..251988b0e7 100644 --- a/cpu-exec.c +++ b/cpu-exec.c @@ -505,6 +505,66 @@ static inline void cpu_handle_interrupt(CPUState *cpu, } } +static inline void cpu_loop_exec_tb(CPUState *cpu, TranslationBlock *tb, + TranslationBlock **last_tb, int *tb_exit, + SyncClocks *sc) +{ + uintptr_t ret; + + if (unlikely(cpu->exit_request)) { + return; + } + + trace_exec_tb(tb, tb->pc); + ret = cpu_tb_exec(cpu, tb); + *last_tb = (TranslationBlock *)(ret & ~TB_EXIT_MASK); + *tb_exit = ret & TB_EXIT_MASK; + switch (*tb_exit) { + case TB_EXIT_REQUESTED: + /* Something asked us to stop executing + * chained TBs; just continue round the main + * loop. Whatever requested the exit will also + * have set something else (eg exit_request or + * interrupt_request) which we will handle + * next time around the loop. But we need to + * ensure the tcg_exit_req read in generated code + * comes before the next read of cpu->exit_request + * or cpu->interrupt_request. + */ + smp_rmb(); + *last_tb = NULL; + break; + case TB_EXIT_ICOUNT_EXPIRED: + { + /* Instruction counter expired. */ +#ifdef CONFIG_USER_ONLY + abort(); +#else + int insns_left = cpu->icount_decr.u32; + if (cpu->icount_extra && insns_left >= 0) { + /* Refill decrementer and continue execution. */ + cpu->icount_extra += insns_left; + insns_left = MIN(0xffff, cpu->icount_extra); + cpu->icount_extra -= insns_left; + cpu->icount_decr.u16.low = insns_left; + } else { + if (insns_left > 0) { + /* Execute remaining instructions. */ + cpu_exec_nocache(cpu, insns_left, *last_tb, false); + align_clocks(sc, cpu); + } + cpu->exception_index = EXCP_INTERRUPT; + *last_tb = NULL; + cpu_loop_exit(cpu); + } + break; +#endif + } + default: + break; + } +} + /* main execution loop */ int cpu_exec(CPUState *cpu) @@ -515,8 +575,6 @@ int cpu_exec(CPUState *cpu) CPUArchState *env = &x86_cpu->env; #endif int ret; - TranslationBlock *tb, *last_tb; - int tb_exit = 0; SyncClocks sc; /* replay_interrupt may need current_cpu */ @@ -543,6 +601,9 @@ int cpu_exec(CPUState *cpu) init_delay_params(&sc, cpu); for(;;) { + TranslationBlock *tb, *last_tb; + int tb_exit = 0; + /* prepare setjmp context for exception handling */ if (sigsetjmp(cpu->jmp_env, 0) == 0) { /* if an exception is pending, we execute it here */ @@ -555,59 +616,7 @@ int cpu_exec(CPUState *cpu) for(;;) { cpu_handle_interrupt(cpu, &last_tb); tb = tb_find_fast(cpu, &last_tb, tb_exit); - if (likely(!cpu->exit_request)) { - uintptr_t ret; - trace_exec_tb(tb, tb->pc); - /* execute the generated code */ - ret = cpu_tb_exec(cpu, tb); - last_tb = (TranslationBlock *)(ret & ~TB_EXIT_MASK); - tb_exit = ret & TB_EXIT_MASK; - switch (tb_exit) { - case TB_EXIT_REQUESTED: - /* Something asked us to stop executing - * chained TBs; just continue round the main - * loop. Whatever requested the exit will also - * have set something else (eg exit_request or - * interrupt_request) which we will handle - * next time around the loop. But we need to - * ensure the tcg_exit_req read in generated code - * comes before the next read of cpu->exit_request - * or cpu->interrupt_request. - */ - smp_rmb(); - last_tb = NULL; - break; - case TB_EXIT_ICOUNT_EXPIRED: - { - /* Instruction counter expired. */ -#ifdef CONFIG_USER_ONLY - abort(); -#else - int insns_left = cpu->icount_decr.u32; - if (cpu->icount_extra && insns_left >= 0) { - /* Refill decrementer and continue execution. */ - cpu->icount_extra += insns_left; - insns_left = MIN(0xffff, cpu->icount_extra); - cpu->icount_extra -= insns_left; - cpu->icount_decr.u16.low = insns_left; - } else { - if (insns_left > 0) { - /* Execute remaining instructions. */ - cpu_exec_nocache(cpu, insns_left, - last_tb, false); - align_clocks(&sc, cpu); - } - cpu->exception_index = EXCP_INTERRUPT; - last_tb = NULL; - cpu_loop_exit(cpu); - } - break; -#endif - } - default: - break; - } - } + cpu_loop_exec_tb(cpu, tb, &last_tb, &tb_exit, &sc); /* Try to align the host and virtual clocks if the guest is in advance */ align_clocks(&sc, cpu); |