74 lines
1.9 KiB
NASM
74 lines
1.9 KiB
NASM
;***************************************************************************
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; libs/libc/machine/sim/arch_setjmp_x86.asm
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;
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; Licensed to the Apache Software Foundation (ASF) under one or more
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; contributor license agreements. See the NOTICE file distributed with
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; this work for additional information regarding copyright ownership. The
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; ASF licenses this file to you under the Apache License, Version 2.0 (the
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; "License"); you may not use this file except in compliance with the
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; License. You may obtain a copy of the License at
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;
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; http://www.apache.org/licenses/LICENSE-2.0
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;
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; Unless required by applicable law or agreed to in writing, software
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; distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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; WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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; License for the specific language governing permissions and limitations
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; under the License.
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;
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;***************************************************************************
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;***************************************************************************
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; Public Functions
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;***************************************************************************
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.model flat, c
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.code
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public setjmp
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public longjmp
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setjmp:
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mov eax, dword ptr [esp+4]
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mov dword ptr [eax], ebx
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mov dword ptr [eax+4], esi
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mov dword ptr [eax+8], edi
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; Save the value of SP as will be after we return
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lea ecx, dword ptr [esp+4]
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mov dword ptr [eax+10h], ecx
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; Save the return PC
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mov ecx, dword ptr [esp]
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mov dword ptr [eax+14h], ecx
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; Save the framepointer
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mov dword ptr [eax+0ch], ebp
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; And return 0
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xor eax, eax
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ret
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longjmp:
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mov ecx, dword ptr [esp+4] ; jmpbuf in ecx.
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mov eax, dword ptr [esp+8] ; Second argument is return value
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; Save the return address now
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mov edx, dword ptr [ecx+14h]
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; Restore registers
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mov ebx, dword ptr [ecx]
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mov esi, dword ptr [ecx+4]
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mov edi, dword ptr [ecx+8]
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mov ebp, dword ptr [ecx+0ch]
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mov esp, dword ptr [ecx+10h]
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jmp dword ptr [ecx+14h]
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end
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