forked from ariadne/libucontext
49 lines
1.3 KiB
ArmAsm
49 lines
1.3 KiB
ArmAsm
/*
|
|
* Copyright (c) 2018 William Pitcock <nenolod@dereferenced.org>
|
|
*
|
|
* 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.
|
|
*/
|
|
|
|
.globl __getcontext;
|
|
__getcontext:
|
|
/* copy all of the current registers into the ucontext structure */
|
|
movq %r8, 40(%rdi)
|
|
movq %r9, 48(%rdi)
|
|
movq %r10, 56(%rdi)
|
|
movq %r11, 64(%rdi)
|
|
movq %r12, 72(%rdi)
|
|
movq %r13, 80(%rdi)
|
|
movq %r14, 88(%rdi)
|
|
movq %r15, 96(%rdi)
|
|
movq %rdi, 104(%rdi)
|
|
movq %rsi, 112(%rdi)
|
|
movq %rbp, 120(%rdi)
|
|
movq %rbx, 128(%rdi)
|
|
movq %rdx, 136(%rdi)
|
|
movq $1, 144(%rdi) /* $1 is %rax */
|
|
movq %rcx, 152(%rdi)
|
|
|
|
/* the first argument on the stack is the jump target (%rip), so we store it in the RIP
|
|
register in the ucontext structure. */
|
|
movq (%rsp), %rcx
|
|
movq %rcx, 168(%rdi)
|
|
|
|
/* finally take the stack pointer address (%rsp) offsetting by 8 to skip over the jump
|
|
target. */
|
|
leaq 8(%rsp), %rcx
|
|
movq %rcx, 160(%rdi)
|
|
|
|
/* we're all done here, return 0 */
|
|
xorl %eax, %eax
|
|
ret
|
|
|
|
|
|
.weak getcontext;
|
|
getcontext = __getcontext;
|