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> Windows > WinAPI clobbered registers, win32 |
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Picnic 19 Apr 2010, 15:57
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19 Apr 2010, 15:57 |
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cod3b453 19 Apr 2010, 21:02
ebx is the only register I've never seen get clobbered. It's also very random from what I remember.
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19 Apr 2010, 21:02 |
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LocoDelAssembly 19 Apr 2010, 21:14
So, there actually exist violations to stdcall convention in the Windows API? Do you remember an example?
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19 Apr 2010, 21:14 |
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cod3b453 19 Apr 2010, 21:35
GetPixel (gdi32) trashes ecx
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19 Apr 2010, 21:35 |
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mindcooler 19 Apr 2010, 21:36
Hmm, I must have been dreaming. I checked all the calls in my current project, and they only clobber eax, ecx and edx. Of course esp and eip change too, but I could have sworn I saw esi and edi change. Must have been tired :S
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19 Apr 2010, 21:36 |
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LocoDelAssembly 19 Apr 2010, 21:45
Quote:
I mean, any that violates the stdcall convention, i.e., not returning you EBX, ESI, EDI and EBP untouched and ESP restored to the value previous to the first pushed argument. [edit]Of course, I mean only those that are specified to be stdcall, so don't mention wsprintf as one not restoring ESP as per stdcall convention  [/edit] |
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19 Apr 2010, 21:45 |
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Tyler 20 Apr 2010, 05:14
WinAPI = stdcall, here's a good explanation of stdcall.
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20 Apr 2010, 05:14 |
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revolution 20 Apr 2010, 05:18
Tyler wrote: WinAPI = stdcall wsprintf wrote: Unlike other Windows functions, wsprintf uses the C calling convention (_cdecl), rather than the Pascal calling convention. As a result, it is the responsibility of the calling process to pop arguments off the stack, and arguments are pushed on the stack from right to left. In C-language modules, the C compiler performs this task. |
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20 Apr 2010, 05:18 |
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Tyler 20 Apr 2010, 06:50
A function defined as WinAPI is stdcall, otherwise it's not WinAPI because WINAPI is macro defined as _stdcall in the Windows headers. I see your point though, I meant only functions that were literally defined as WINAPI in Window's headers.
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20 Apr 2010, 06:50 |
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cod3b453 20 Apr 2010, 09:51
LocoDelAssembly wrote:
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20 Apr 2010, 09:51 |
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