On Sat, Jan 28, 2012 at 05:17:56PM -0500, Xin Tong wrote:
> I am investigating what longjmp is used for in qemu.
>
> longjmp is used in a couple of places.
>
> 1.
> void cpu_loop_exit(void)
> {
> env->current_tb = NULL;
> longjmp(env->jmp_env, 1);
> }
>
> cpu_loop_exit is called when there is an interrupt_request or exit_request
> pending
Yes.
> 2.
> void cpu_resume_from_signal(CPUState *env1, void *puc)
> {
> ...
> longjmp(env->jmp_env, 1);
> }
>
> cpu_resume_from_signal is called in a couple of places, each of which
> suggests something faulty has happened. my guess is that it will get call
> when exceptions have occurred in the code cache. Am I right ?
Not exactly. `grep -r cpu_resume_from_signal` shows places using
cpu_resume_from_signal. Not all of them means something faulty has happened,
I think.
Regards,
chenwj
--
Wei-Ren Chen (陳韋任)
Computer Systems Lab, Institute of Information Science,
Academia Sinica, Taiwan (R.O.C.)
Tel:886-2-2788-3799 #1667
Homepage: http://people.cs.nctu.edu.tw/~chenwj
