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LibC: Add x86_64 implementation of setjmp() and longjmp()

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This commit is contained in:
Andreas Kling 2021-02-25 15:26:08 +01:00
parent 17f076d912
commit 8714f389f9
4 changed files with 72 additions and 4 deletions
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57
Userland/Libraries/LibC/arch/x86_64/setjmp.S Normal file
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/*
* Copyright (c) 2021, Andreas Kling <kling@serenityos.org>
* 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.
*
* 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 HOLDER 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.
*/
.global setjmp
setjmp:
mov %rbx, (%rdi)
mov %rbp, 8(%rdi)
mov %r12, 16(%rdi)
mov %r13, 24(%rdi)
mov %r14, 32(%rdi)
mov %r15, 40(%rdi)
lea 8(%rsp), %rcx
mov %rcx, 48(%rdi)
mov (%rsp), %rcx
mov %rcx, 56(%rdi)
xor %eax, %eax
ret
.global longjmp
longjmp:
mov (%rdi), %rbx
mov 8(%rdi), %rbp
mov 16(%rdi), %r12
mov 24(%rdi), %r13
mov 32(%rdi), %r14
mov 40(%rdi), %r15
mov 48(%rdi), %rsp
test %rsi, %rsi
jnz .nonzero
mov 1, %rax
.nonzero:
jmp *56(%rdi)