1 /** @file 2 Implementation of SetJump() 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 Worker function that checks ASSERT condition for JumpBuffer 20 21 Checks ASSERT condition for JumpBuffer. 22 23 If JumpBuffer is NULL, then ASSERT(). 24 For IPF CPUs, if JumpBuffer is not aligned on a 16-byte boundary, then ASSERT(). 25 26 @param JumpBuffer A pointer to CPU context buffer. 27 28 **/ 29 VOID 30 EFIAPI 31 InternalAssertJumpBuffer ( 32 IN BASE_LIBRARY_JUMP_BUFFER *JumpBuffer 33 ); 34 35 /** 36 Saves the current CPU context that can be restored with a call to LongJump() 37 and returns 0. 38 39 Saves the current CPU context in the buffer specified by JumpBuffer and 40 returns 0. The initial call to SetJump() must always return 0. Subsequent 41 calls to LongJump() cause a non-zero value to be returned by SetJump(). 42 43 If JumpBuffer is NULL, then ASSERT(). 44 For IPF CPUs, if JumpBuffer is not aligned on a 16-byte boundary, then ASSERT(). 45 46 @param JumpBuffer A pointer to CPU context buffer. 47 48 @retval 0 Indicates a return from SetJump(). 49 50 **/ 51 _declspec (naked) 52 UINTN 53 EFIAPI 54 SetJump ( 55 OUT BASE_LIBRARY_JUMP_BUFFER *JumpBuffer 56 ) 57 { 58 _asm { 59 push [esp + 4] 60 call InternalAssertJumpBuffer 61 pop ecx 62 pop ecx 63 mov edx, [esp] 64 mov [edx], ebx 65 mov [edx + 4], esi 66 mov [edx + 8], edi 67 mov [edx + 12], ebp 68 mov [edx + 16], esp 69 mov [edx + 20], ecx 70 xor eax, eax 71 jmp ecx 72 } 73 } 74 75
