imported>Unknown at 05:23, 7 February 2021

2021-02-07T05:23:58Z

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//
// setjmp.c
//
// Non-local goto
//
// Copyright (C) 2002 Michael Ringgaard. All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions
// are met:
//
// 1. Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// 2. Redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in the
// documentation and/or other materials provided with the distribution.
// 3. Neither the name of the project nor the names of its contributors
// may be used to endorse or promote products derived from this software
// without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE
// FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
// DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
// OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
// HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
// LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
// OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
// SUCH DAMAGE.
//

#include "setjmp.h"

#define OFS_EBP 0
#define OFS_EBX 4
#define OFS_EDI 8
#define OFS_ESI 12
#define OFS_ESP 16
#define OFS_EIP 20

__declspec(naked) int setjmp(jmp_buf env)
{
__asm
{
mov edx, 4[esp] // Get jmp_buf pointer
mov eax, [esp] // Save EIP
mov OFS_EIP[edx], eax
mov OFS_EBP[edx], ebp // Save EBP, EBX, EDI, ESI, and ESP
mov OFS_EBX[edx], ebx
mov OFS_EDI[edx], edi
mov OFS_ESI[edx], esi
mov OFS_ESP[edx], esp
xor eax, eax // Return 0
ret
}
}

__declspec(naked) void longjmp(jmp_buf env, int value)
{
__asm
{
mov edx, 4[esp] // Get jmp_buf pointer
mov eax, 8[esp] // Get return value (eax)

mov esp, OFS_ESP[edx] // Switch to new stack position
mov ebx, OFS_EIP[edx] // Get new EIP value and set as return address
mov [esp], ebx

mov ebp, OFS_EBP[edx] // Restore EBP, EBX, EDI, and ESI
mov ebx, OFS_EBX[edx]
mov edi, OFS_EDI[edx]
mov esi, OFS_ESI[edx]

ret
}
}
----
[[OurMajorLangIsCAndCPlusPlus]]

OurMajorLangIsCAndCPlusPlus/setjmp.c - Revision history

imported>Unknown at 05:23, 7 February 2021