* return address in __cyg_profile_func_exit
@ 2009-04-08 14:58 Laurent Burgy
2009-04-08 15:23 ` Andrew Haley
0 siblings, 1 reply; 2+ messages in thread
From: Laurent Burgy @ 2009-04-08 14:58 UTC (permalink / raw)
To: gcc-help
Hi,
I've been unable to find a high-level way of getting the original
return address of a function when entering __cyg_profile_func_exit.
__cyg_profile_func_exit is executed at the end of a function, is there
any way (with a builting) to retrieve the original returned value.
That would enable me to investigate the returned values without
modifying the calling site. The information must be somewhere but I
don't know how to reach it. (Getting EBX is not an option that I
consider since the value may depend on the level of optimization -i've
seen it only works with -O0).
Thanks...
--
Laurent Burgy
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: return address in __cyg_profile_func_exit
2009-04-08 14:58 return address in __cyg_profile_func_exit Laurent Burgy
@ 2009-04-08 15:23 ` Andrew Haley
0 siblings, 0 replies; 2+ messages in thread
From: Andrew Haley @ 2009-04-08 15:23 UTC (permalink / raw)
To: Laurent Burgy; +Cc: gcc-help
Laurent Burgy wrote:
> I've been unable to find a high-level way of getting the original
> return address of a function when entering __cyg_profile_func_exit.
>
> __cyg_profile_func_exit is executed at the end of a function, is there
> any way (with a builting) to retrieve the original returned value.
> That would enable me to investigate the returned values without
> modifying the calling site. The information must be somewhere but I
> don't know how to reach it. (Getting EBX is not an option that I
> consider since the value may depend on the level of optimization -i've
> seen it only works with -O0).
The return value is in EAX, but it isn't there when __cyg_profile_func_exit
is called. It'd be quite easy to modify the compiler to do this, and not
possible otherwise.
Andrew.
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