mirror of
https://github.com/jart/cosmopolitan.git
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74 lines
3.9 KiB
ArmAsm
74 lines
3.9 KiB
ArmAsm
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/*-*- mode:unix-assembly; indent-tabs-mode:t; tab-width:8; coding:utf-8 -*-│
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│vi: set et ft=asm ts=8 tw=8 fenc=utf-8 :vi│
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2022 Justine Alexandra Roberts Tunney │
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│ │
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│ Permission to use, copy, modify, and/or distribute this software for │
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│ any purpose with or without fee is hereby granted, provided that the │
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│ above copyright notice and this permission notice appear in all copies. │
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│ │
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│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
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│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
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│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
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│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
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│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
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│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
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│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
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│ PERFORMANCE OF THIS SOFTWARE. │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/macros.internal.h"
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// Sets machine state.
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//
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// @note please use longerjmp() and setlongerjmp() for fibers
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// @note currently only sets general registers
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// @see getcontext()
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setcontext:
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mov 40(%rdi),%r8
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mov 48(%rdi),%r9
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mov 56(%rdi),%r10
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mov 64(%rdi),%r11
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mov 72(%rdi),%r12
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mov 80(%rdi),%r13
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mov 88(%rdi),%r14
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mov 96(%rdi),%r15
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mov 112(%rdi),%rsi
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mov 120(%rdi),%rbp
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mov 128(%rdi),%rbx
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mov 136(%rdi),%rdx
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mov 144(%rdi),%rax
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mov 152(%rdi),%rcx
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mov 160(%rdi),%rsp
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xor %rax,%rax
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push 168(%rdi)
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mov 104(%rdi),%rdi
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ret
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.endfn setcontext,globl
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.end
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////////////////////////////////////////////////////////////////////////////////
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noasan noubsan int setcontext(const ucontext_t *uc) {
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asm volatile("mov\t%0,%%r8" : /* no outputs */ : "m"(uc->uc_mcontext.r8));
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asm volatile("mov\t%0,%%r9" : /* no outputs */ : "m"(uc->uc_mcontext.r9));
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asm volatile("mov\t%0,%%r10" : /* no outputs */ : "m"(uc->uc_mcontext.r10));
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asm volatile("mov\t%0,%%r11" : /* no outputs */ : "m"(uc->uc_mcontext.r11));
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asm volatile("mov\t%0,%%r12" : /* no outputs */ : "m"(uc->uc_mcontext.r12));
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asm volatile("mov\t%0,%%r13" : /* no outputs */ : "m"(uc->uc_mcontext.r13));
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asm volatile("mov\t%0,%%r14" : /* no outputs */ : "m"(uc->uc_mcontext.r14));
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asm volatile("mov\t%0,%%r15" : /* no outputs */ : "m"(uc->uc_mcontext.r15));
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asm volatile("mov\t%0,%%rsi" : /* no outputs */ : "m"(uc->uc_mcontext.rsi));
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asm volatile("mov\t%0,%%rbp" : /* no outputs */ : "m"(uc->uc_mcontext.rbp));
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asm volatile("mov\t%0,%%rbx" : /* no outputs */ : "m"(uc->uc_mcontext.rbx));
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asm volatile("mov\t%0,%%rdx" : /* no outputs */ : "m"(uc->uc_mcontext.rdx));
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asm volatile("mov\t%0,%%rax" : /* no outputs */ : "m"(uc->uc_mcontext.rax));
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asm volatile("mov\t%0,%%rcx" : /* no outputs */ : "m"(uc->uc_mcontext.rcx));
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asm volatile("mov\t%0,%%rsp" : /* no outputs */ : "m"(uc->uc_mcontext.rsp));
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asm volatile("xor\t%%rax,%%rax\n\t"
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"push\t%0\n\t"
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"mov\t%1,%%rdi\n\t"
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"ret"
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: /* no outputs */
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: "m"(uc->uc_mcontext.rip), "m"(uc->uc_mcontext.rdi));
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unreachable;
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}
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