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Re: [Qemu-devel] longjmp in qemu


From: 陳韋任
Subject: Re: [Qemu-devel] longjmp in qemu
Date: Tue, 31 Jan 2012 14:04:41 +0800
User-agent: Mutt/1.5.21 (2010-09-15)

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



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