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List:       bochs-dev
Subject:    Re: [Bochs-developers] ENTRY_ARG?
From:       "Kevin O'Connor" <kevin () koconnor ! net>
Date:       2008-04-11 0:53:32
Message-ID: 20080411005332.GE4749 () ohio ! lan
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Hi,

I'm cc'ing the bochs list.

On Thu, Apr 10, 2008 at 04:08:18PM +0900, Nguyen Anh Quynh wrote:
> hi,
> 
> in ENTRY_ARG you save %esp into %ebx before calling C function. after
> returning from C function, you restore back %esp from %ebx. how can
> you make sure that the C function doesnt clobber %ebx?
> 
> cheers,
> Q

That is the x86 calling convention.  eax, ecx, and edx are call
clobbered.  The remaining general purpose registers (ebx, esi, edi,
ebp) are call saved.

-Kevin

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