86 lines
1.9 KiB
NASM
86 lines
1.9 KiB
NASM
;***************************************************************************
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; libs/libc/machine/sim/arch_setjmp_x86_64.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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.code
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public setjmp
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public longjmp
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setjmp:
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; Get the return address, adjusting the stack pointer
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pop rsi
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; Set up the return value
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xor rax, rax
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; Save 1: rbx
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mov [rcx], rbx
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; Save 2: Value of the rsp *after* returning
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mov [rcx+8], rsp
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; Fix up the return stack
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push rsi
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; Save registers
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; Storage order: %rbx, %rsp, %rbp, %r12, %r13, %r14, %r15, %rip
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mov [rcx+10h], rbp
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mov [rcx+18h], r12
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mov [rcx+20h], r13
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mov [rcx+28h], r14
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mov [rcx+30h], r15
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mov [rcx+38h], rsi
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ret
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longjmp:
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; Setup return value
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mov rax, rdx
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; Restore registers
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mov rbx, [rcx]
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mov rsp, [rcx+8]
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mov rbp, [rcx+10h]
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mov r12, [rcx+18h]
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mov r13, [rcx+20h]
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mov r14, [rcx+28h]
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mov r15, [rcx+30h]
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; Jump to the saved return address (rsi)
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jmp qword ptr [rcx+38h]
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end
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