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MdePkg Base.h: Fix EBC build failure and add comments for RETURN_ADDRESS macro. 

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Star Zeng <star.zeng@intel.com>
Reviewed-by: Jiewen Yao <jiewen.yao@intel.com>

git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@16395 6f19259b-4bc3-4df7-8a09-765794883524
This commit is contained in:
Star Zeng 2014-11-17 01:53:41 +00:00 committed by lzeng14
parent 4613300895
commit 1db55d6a82
1 changed files with 32 additions and 12 deletions
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44
MdePkg/Include/Base.h
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@ -1016,24 +1016,44 @@ typedef UINTN RETURN_STATUS;
#define SIGNATURE_64(A, B, C, D, E, F, G, H) \
(SIGNATURE_32 (A, B, C, D) | ((UINT64) (SIGNATURE_32 (E, F, G, H)) << 32))
#if defined(_MSC_EXTENSIONS)
//
// Intrinsic function provides the address of the instruction in the calling
// function that will be executed after control returns to the caller.
//
#if defined(_MSC_EXTENSIONS) && !defined (MDE_CPU_EBC)
#pragma intrinsic(_ReturnAddress)
/**
Get the return address of the calling funcation.
Based on intrinsic function _ReturnAddress that provides the address of
the instruction in the calling function that will be executed after
control returns to the caller.
@param L Return Level.
@return The return address of the calling funcation or 0 if L != 0.
**/
#define RETURN_ADDRESS(L) ((L == 0) ? _ReturnAddress() : (VOID *) 0)
#elif defined(__GNUC__)
//
// Built-in Function returns the return address of the current function,
// or of one of its callers.
//
void * __builtin_return_address (unsigned int level);
/**
Get the return address of the calling funcation.
Based on built-in Function __builtin_return_address that returns
the return address of the current function, or of one of its callers.
@param L Return Level.
@return The return address of the calling funcation.
**/
#define RETURN_ADDRESS(L) __builtin_return_address (L)
#else
//
// Compilers don't support this feature.
//
/**
Get the return address of the calling funcation.
@param L Return Level.
@return 0 as compilers don't support this feature.
**/
#define RETURN_ADDRESS(L) ((VOID *) 0)
#endif