1 /** @file
2 Implementation of _LongJump() on IA-32.
3
4 Copyright (c) 2006 - 2008, Intel Corporation. All rights reserved.<BR>
5 This program and the accompanying materials
6 are licensed and made available under the terms and conditions of the BSD License
7 which accompanies this distribution. The full text of the license may be found at
8 http://opensource.org/licenses/bsd-license.php.
9
10 THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
11 WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
12
13 **/
14
15
16 #include "BaseLibInternals.h"
17
18
19 /**
20 Restores the CPU context that was saved with SetJump().
21
22 Restores the CPU context from the buffer specified by JumpBuffer.
23 This function never returns to the caller.
24 Instead is resumes execution based on the state of JumpBuffer.
25
26 @param JumpBuffer A pointer to CPU context buffer.
27 @param Value The value to return when the SetJump() context is restored.
28
29 **/
30 __declspec (naked)
31 VOID
32 EFIAPI
InternalLongJump(IN BASE_LIBRARY_JUMP_BUFFER * JumpBuffer,IN UINTN Value)33 InternalLongJump (
34 IN BASE_LIBRARY_JUMP_BUFFER *JumpBuffer,
35 IN UINTN Value
36 )
37 {
38 _asm {
39 pop eax ; skip return address
40 pop edx ; edx <- JumpBuffer
41 pop eax ; eax <- Value
42 mov ebx, [edx]
43 mov esi, [edx + 4]
44 mov edi, [edx + 8]
45 mov ebp, [edx + 12]
46 mov esp, [edx + 16]
47 jmp dword ptr [edx + 20]
48 }
49 }
50
51