forked from ariadne/libucontext
47 lines
1.5 KiB
ArmAsm
47 lines
1.5 KiB
ArmAsm
/*
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* Copyright (c) 2018, 2020 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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#include "defs.h"
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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
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movq REG_OFFSET(REG_R9)(%rdi), %r9
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movq REG_OFFSET(REG_R10)(%rdi), %r10
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movq REG_OFFSET(REG_R11)(%rdi), %r11
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movq REG_OFFSET(REG_R12)(%rdi), %r12
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movq REG_OFFSET(REG_R13)(%rdi), %r13
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movq REG_OFFSET(REG_R14)(%rdi), %r14
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movq REG_OFFSET(REG_R15)(%rdi), %r15
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movq REG_OFFSET(REG_RSI)(%rdi), %rsi
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movq REG_OFFSET(REG_RBP)(%rdi), %rbp
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movq REG_OFFSET(REG_RBX)(%rdi), %rbx
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movq REG_OFFSET(REG_RDX)(%rdi), %rdx
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movq REG_OFFSET(REG_RAX)(%rdi), %rax
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movq REG_OFFSET(REG_RCX)(%rdi), %rcx
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movq REG_OFFSET(REG_RSP)(%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 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
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ret
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END(libucontext_setcontext)
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