libucontext/arch/x86_64/setcontext.S

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/*
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* Copyright (c) 2018, 2020 Ariadne Conill <ariadne@dereferenced.org>
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*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* This software is provided 'as is' and without any warranty, express or
* implied. In no event shall the authors be liable for any damages arising
* from the use of this software.
*/
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#include "defs.h"
ALIAS(setcontext, libucontext_setcontext)
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ALIAS(__setcontext, libucontext_setcontext)
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FUNC(libucontext_setcontext)
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/* set all of the registers */
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movq REG_OFFSET(REG_R8)(%rdi), %r8
movq REG_OFFSET(REG_R9)(%rdi), %r9
movq REG_OFFSET(REG_R10)(%rdi), %r10
movq REG_OFFSET(REG_R11)(%rdi), %r11
movq REG_OFFSET(REG_R12)(%rdi), %r12
movq REG_OFFSET(REG_R13)(%rdi), %r13
movq REG_OFFSET(REG_R14)(%rdi), %r14
movq REG_OFFSET(REG_R15)(%rdi), %r15
movq REG_OFFSET(REG_RSI)(%rdi), %rsi
movq REG_OFFSET(REG_RBP)(%rdi), %rbp
movq REG_OFFSET(REG_RBX)(%rdi), %rbx
movq REG_OFFSET(REG_RDX)(%rdi), %rdx
movq REG_OFFSET(REG_RAX)(%rdi), %rax
movq REG_OFFSET(REG_RCX)(%rdi), %rcx
movq REG_OFFSET(REG_RSP)(%rdi), %rsp
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/* set the jump target by pushing it to the stack.
ret will pop the new %rip from the stack, causing us to jump there. */
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pushq REG_OFFSET(REG_RIP)(%rdi)
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/* finally, set %rdi correctly. */
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movq REG_OFFSET(REG_RDI)(%rdi), %rdi
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/* we're all done here, return 0 */
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xorl %eax, %eax
ret
END(libucontext_setcontext)