MdePkg BaseLib: Add the missing nasm source file InternalSwitchStack.nasm

BaseLib Ia32 InternalSwitchStack.S has no matched InternalSwitchStack.nasm.
Use ObjDump to verify the output object files be same.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Liming Gao <liming.gao@intel.com>
Reviewed-by: Jeff Fan <jeff.fan@intel.com>

diff --git a/MdePkg/Library/BaseLib/BaseLib.inf b/MdePkg/Library/BaseLib/BaseLib.inf
index 46a8c86172214b08945abce4a1cd1dc5f9270aca..1ffe870e7ee44503ceedc479528c405eb3c802c4 100644 (file)
--- a/MdePkg/Library/BaseLib/BaseLib.inf
+++ b/MdePkg/Library/BaseLib/BaseLib.inf
@@ -1,7 +1,7 @@
 ## @file\r
 #  Base Library implementation.\r
 #\r
-#  Copyright (c) 2007 - 2015, Intel Corporation. All rights reserved.<BR>\r
+#  Copyright (c) 2007 - 2016, Intel Corporation. All rights reserved.<BR>\r
 #  Portions copyright (c) 2008 - 2009, Apple Inc. All rights reserved.<BR>\r
 #  Portions copyright (c) 2011 - 2013, ARM Ltd. All rights reserved.<BR>\r
 #\r
@@ -410,6 +410,7 @@
   Ia32/InternalSwitchStack.c | MSFT\r
   Ia32/InternalSwitchStack.c | INTEL\r
   Ia32/InternalSwitchStack.S | GCC\r
+  Ia32/InternalSwitchStack.nasm | GCC\r
   Ia32/Non-existing.c\r
   Unaligned.c\r
   X86WriteIdtr.c\r

diff --git a/MdePkg/Library/BaseLib/Ia32/InternalSwitchStack.nasm b/MdePkg/Library/BaseLib/Ia32/InternalSwitchStack.nasm
new file mode 100644 (file)
index 0000000..3da341c
--- /dev/null
+++ b/MdePkg/Library/BaseLib/Ia32/InternalSwitchStack.nasm
@@ -0,0 +1,47 @@
+;------------------------------------------------------------------------------\r
+;\r
+; Copyright (c) 2016, Intel Corporation. All rights reserved.<BR>\r
+; Portions copyright (c) 2011, Apple Inc. All rights reserved.<BR>\r
+; This program and the accompanying materials\r
+; are licensed and made available under the terms and conditions of the BSD License\r
+; which accompanies this distribution.  The full text of the license may be found at\r
+; http://opensource.org/licenses/bsd-license.php.\r
+;\r
+; THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r
+; WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r
+;\r
+; Module Name:\r
+;\r
+;   InternalSwitchStack.nasm\r
+;\r
+; Abstract:\r
+;\r
+;   Implementation of a stack switch on IA-32.\r
+;\r
+;------------------------------------------------------------------------------\r
+\r
+    SECTION .text\r
+\r
+;------------------------------------------------------------------------------\r
+; VOID\r
+; EFIAPI\r
+; InternalSwitchStack (\r
+;   IN      SWITCH_STACK_ENTRY_POINT  EntryPoint,\r
+;   IN      VOID                      *Context1,   OPTIONAL\r
+;   IN      VOID                      *Context2,   OPTIONAL\r
+;   IN      VOID                      *NewStack\r
+;   );\r
+;------------------------------------------------------------------------------\r
+global ASM_PFX(InternalSwitchStack)\r
+ASM_PFX(InternalSwitchStack):\r
+  push  ebp\r
+  mov   ebp, esp\r
+\r
+  mov   esp, [ebp + 20]    ; switch stack\r
+  sub   esp, 8\r
+  mov   eax, [ebp + 16]\r
+  mov   [esp + 4], eax\r
+  mov   eax, [ebp + 12]\r
+  mov   [esp], eax\r
+  push  0                  ; keeps gdb from unwinding stack\r
+  jmp   dword [ebp + 8]    ; call and never return\r