Inline assembler is non portable and should never be in generic code. So you
need to write .asm/.s files (VC++/GNU).
The general answer for edk2 is DON'T write assembler, use C code. There are C
APIs in the edk2 MdePkg that perform a lot of the common operations, that are
implemented in an optimized way for all the supported compilers (VC++, GCC,
clang, etc.).
https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2/MdePkg/Include/Library/BaseLib.h
https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2/MdePkg/Include/Library/IoLib.h
So why do you need assembly code?
Thanks,
Andrew Fish
On Jul 17, 2013, at 1:29 PM, "Vardhana, Ananda" <[email protected]>
wrote:
> I am new to EFI and have a very simple question. I want to compile this
> following short program. I am running on a 64 bit machine and the EDKII is
> also 64 bit. I have tried with _asm and __asm both failed. Might be I have to
> use () instead of {}? I don’t know. Help pelase
>
VC++ does not support inline assembly in X64. Good call on their part.
> EFI_STATUS
> EFIAPI
> UefiMain (
> IN EFI_HANDLE ImageHandle,
> IN EFI_SYSTEM_TABLE *SystemTable
> )
> {
>
> _asm {
> push ebx
> push eax
> push ecx
> push edx
> /* Other code follows*/
> }
> }
>
>
>
>
>
>
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