Re: [Qemu-devel] Why we need unlink tb when cpu_interrupt/cpu_exit get called?

[malc]

On Mon, 2 Apr 2012, ??? wrote:

> Hi all,
> 
>   I am wondering why we need to unlink tb when cpu_interrupt/cpu_exit is
> called, and want to know what happened if we don't unlink tb. In theory,
> QEMU want the execution flow comes back from code cache to QEMU itself
> so that interrupts can be handled as soon as possible. However, I ran
> linux-0.2.img with a modified QEMU whose cpu_unlink_tb does nothing.
> Everything seems work fine. Is this experiment too trivial to show what
> bad things happened when we don't unlink tb?
> 
>   Thanks! :)

Try following with and without tb unlinking on aforementioned image to
feel the difference:

sh-2.05b# echo "char main[]={0xeb,-2};" >h.c
sh-2.05b# tcc -run h.c

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