On Mon, Feb 13, 2017 at 2:19 PM, Richard Henderson <r...@twiddle.net> wrote:
> On 02/13/2017 11:10 PM, Alex Bennée wrote:
>>
>> @@ -239,9 +240,16 @@ static void cpu_exec_step(CPUState *cpu)
>> 1 | CF_NOCACHE | CF_IGNORE_ICOUNT);
>> tb->orig_tb = NULL;
>> tb_unlock();
>> - /* execute the generated code */
>> - trace_exec_tb_nocache(tb, pc);
>> - cpu_tb_exec(cpu, tb);
>> +
>> + cc->cpu_exec_enter(cpu);
>> +
>> + if (sigsetjmp(cpu->jmp_env, 0) == 0) {
>> + /* execute the generated code */
>> + trace_exec_tb_nocache(tb, pc);
>> + cpu_tb_exec(cpu, tb);
>> + }
>
>
> I don't understand this, since cpu_tb_exec has its own sigsetjmp. Where is
> the exception supposed to come from that escapes?
cpu_exec() has its own sigsetjmp, not cpu_tb_exec(). The exception is
the debug exception from the generated code. Without this new
sigsetjmp, it'll jump to cpu_exec() instead of coming back here.
Thanks,
--
Pranith
