1 files changed, 74 insertions, 0 deletions
diff --git a/Core/MdePkg/Library/BaseLib/Ia32/SetJump.c b/Core/MdePkg/Library/BaseLib/Ia32/SetJump.c
new file mode 100644
index 0000000000..304f3839b1
--- /dev/null
+++ b/Core/MdePkg/Library/BaseLib/Ia32/SetJump.c
@@ -0,0 +1,74 @@
+/** @file
+  Implementation of SetJump() on IA-32.
+
+  Copyright (c) 2006 - 2008, Intel Corporation. All rights reserved.<BR>
+  This program and the accompanying materials
+  are licensed and made available under the terms and conditions of the BSD License
+  which accompanies this distribution.  The full text of the license may be found at
+  http://opensource.org/licenses/bsd-license.php.
+
+  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+
+**/
+
+
+#include "BaseLibInternals.h"
+
+/**
+  Worker function that checks ASSERT condition for JumpBuffer
+
+  Checks ASSERT condition for JumpBuffer.
+
+  If JumpBuffer is NULL, then ASSERT().
+  For IPF CPUs, if JumpBuffer is not aligned on a 16-byte boundary, then ASSERT().
+
+  @param  JumpBuffer    A pointer to CPU context buffer.
+
+**/
+VOID
+EFIAPI
+InternalAssertJumpBuffer (
+  IN      BASE_LIBRARY_JUMP_BUFFER  *JumpBuffer
+  );
+
+/**
+  Saves the current CPU context that can be restored with a call to LongJump()
+  and returns 0.
+
+  Saves the current CPU context in the buffer specified by JumpBuffer and
+  returns 0. The initial call to SetJump() must always return 0. Subsequent
+  calls to LongJump() cause a non-zero value to be returned by SetJump().
+
+  If JumpBuffer is NULL, then ASSERT().
+  For IPF CPUs, if JumpBuffer is not aligned on a 16-byte boundary, then ASSERT().
+
+  @param  JumpBuffer  A pointer to CPU context buffer.
+
+  @retval 0 Indicates a return from SetJump().
+
+**/
+_declspec (naked)
+UINTN
+EFIAPI
+SetJump (
+  OUT     BASE_LIBRARY_JUMP_BUFFER  *JumpBuffer
+  )
+{
+  _asm {
+    push    [esp + 4]
+    call    InternalAssertJumpBuffer
+    pop     ecx
+    pop     ecx
+    mov     edx, [esp]
+    mov     [edx], ebx
+    mov     [edx + 4], esi
+    mov     [edx + 8], edi
+    mov     [edx + 12], ebp
+    mov     [edx + 16], esp
+    mov     [edx + 20], ecx
+    xor     eax, eax
+    jmp     ecx
+  }
+}
+