From: Star Zeng <star.zeng@intel.com>
Date: Wed, 12 Nov 2014 03:18:09 +0000 (+0000)
Subject: MdePkg: Add RETURN_ADDRESS macro into Base.h.
X-Git-Tag: edk2-stable201903~10676
X-Git-Url: https://git.proxmox.com/?p=mirror_edk2.git;a=commitdiff_plain;h=dad83a8c1207e585b2cb417d0680fe2e9452d262;hp=1531a469ebc1e0130af04aa10c533b497fc3198a

MdePkg: Add RETURN_ADDRESS macro into Base.h.

Based on compiler intrinsic function.
MSVC: _ReturnAddress
GCC: __builtin_return_address

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@16334 6f19259b-4bc3-4df7-8a09-765794883524
---

diff --git a/MdePkg/Include/Base.h b/MdePkg/Include/Base.h
index 4dda3c2f40..5934b0f998 100644
--- a/MdePkg/Include/Base.h
+++ b/MdePkg/Include/Base.h
@@ -6,7 +6,7 @@
   environment. There are a set of base libraries in the Mde Package that can
   be used to implement base modules.
 
-Copyright (c) 2006 - 2013, Intel Corporation. All rights reserved.<BR>
+Copyright (c) 2006 - 2014, Intel Corporation. All rights reserved.<BR>
 Portions copyright (c) 2008 - 2009, Apple Inc. All rights reserved.<BR>
 This program and the accompanying materials
 are licensed and made available under the terms and conditions of the BSD License
@@ -1016,5 +1016,26 @@ 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.
+  //
+  #pragma intrinsic(_ReturnAddress)
+  #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);
+  #define RETURN_ADDRESS(L)     __builtin_return_address (L)
+#else
+  //
+  // Compilers don't support this feature.
+  //
+  #define RETURN_ADDRESS(L)     ((VOID *) 0)
+#endif
+
 #endif