Re: [Qemu-devel] tcg_qemu_tb_exec...

[Wei-Ren Chen]

On Sun, Jun 03, 2012 at 10:44:32PM +0200, Davide Ferraretto wrote:
> I'm in qemu-arm.
> tcg_qemu_tb_exec function is a macro:
> #define tcg_qemu_tb_exec(env, tb_ptr)                                    \
>     ((long REGPARM (*)(void *, void *))code_gen_prologue)(env, tb_ptr)
> #endif

  QEMU treats execution in code cache as a function call. As you might know,
function has its prologue/epilogue, the "code_gen_prologue" stores the
prologue/epilogue code. After executing prologue, it'll jump to the code cache
(tb_ptr), then back to epilogue, finally return to QEMU.

Regards,
chenwj

[1] http://en.wikipedia.org/wiki/Function_prologue

-- 
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