forked from ariadne/libucontext
45 lines
1.2 KiB
ArmAsm
45 lines
1.2 KiB
ArmAsm
/*
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* Copyright (c) 2018 Ariadne Conill <ariadne@dereferenced.org>
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*
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* Permission to use, copy, modify, and/or distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* This software is provided 'as is' and without any warranty, express or
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* implied. In no event shall the authors be liable for any damages arising
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* from the use of this software.
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*/
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.globl __setcontext;
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__setcontext:
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/* set all of the registers */
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movq 40(%rdi), %r8
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movq 48(%rdi), %r9
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movq 56(%rdi), %r10
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movq 64(%rdi), %r11
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movq 72(%rdi), %r12
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movq 80(%rdi), %r13
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movq 88(%rdi), %r14
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movq 96(%rdi), %r15
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movq 112(%rdi), %rsi
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movq 120(%rdi), %rbp
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movq 128(%rdi), %rbx
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movq 136(%rdi), %rdx
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movq 144(%rdi), %rax
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movq 152(%rdi), %rcx
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movq 160(%rdi), %rsp
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/* set the jump target by pushing it to the stack.
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ret will pop the new %rip from the stack, causing us to jump there. */
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pushq 168(%rdi)
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/* finally, set %rdi correctly. */
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movq 104(%rdi), %rdi
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/* we're all done here, return 0 */
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xorl %eax, %eax
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ret
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.weak setcontext;
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setcontext = __setcontext;
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