mirror of
https://github.com/jart/cosmopolitan.git
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79 lines
3.8 KiB
ArmAsm
79 lines
3.8 KiB
ArmAsm
/*-*- 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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// Gets 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 gets general registers
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// @see setcontext()
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getcontext:
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mov %r8,40(%rdi)
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mov %r9,48(%rdi)
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mov %r10,56(%rdi)
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mov %r11,64(%rdi)
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mov %r12,72(%rdi)
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mov %r13,80(%rdi)
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mov %r14,88(%rdi)
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mov %r15,96(%rdi)
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mov %rdi,104(%rdi)
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mov %rsi,112(%rdi)
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mov %rbp,120(%rdi)
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mov %rbx,128(%rdi)
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mov %rdx,136(%rdi)
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mov %rax,144(%rdi)
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mov %rcx,152(%rdi)
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lea 8(%rsp),%rax
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mov %rax,160(%rdi)
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mov (%rsp),%rax
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mov %rax,168(%rdi)
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xor %eax,%eax
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ret
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.endfn getcontext,globl
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.end
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////////////////////////////////////////////////////////////////////////////////
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noasan noubsan noinstrument int getcontext(ucontext_t *uc) {
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asm volatile("mov\t%%r8,%0" : "=m"(uc->uc_mcontext.r8));
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asm volatile("mov\t%%r9,%0" : "=m"(uc->uc_mcontext.r9));
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asm volatile("mov\t%%r10,%0" : "=m"(uc->uc_mcontext.r10));
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asm volatile("mov\t%%r11,%0" : "=m"(uc->uc_mcontext.r11));
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asm volatile("mov\t%%r12,%0" : "=m"(uc->uc_mcontext.r12));
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asm volatile("mov\t%%r13,%0" : "=m"(uc->uc_mcontext.r13));
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asm volatile("mov\t%%r14,%0" : "=m"(uc->uc_mcontext.r14));
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asm volatile("mov\t%%r15,%0" : "=m"(uc->uc_mcontext.r15));
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asm volatile("mov\t%%rdi,%0" : "=m"(uc->uc_mcontext.rdi));
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asm volatile("mov\t%%rsi,%0" : "=m"(uc->uc_mcontext.rsi));
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asm volatile("mov\t%%rbp,%0" : "=m"(uc->uc_mcontext.rbp));
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asm volatile("mov\t%%rbx,%0" : "=m"(uc->uc_mcontext.rbx));
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asm volatile("mov\t%%rdx,%0" : "=m"(uc->uc_mcontext.rdx));
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asm volatile("mov\t%%rax,%0" : "=m"(uc->uc_mcontext.rax));
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asm volatile("mov\t%%rcx,%0" : "=m"(uc->uc_mcontext.rcx));
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asm volatile("lea\t8(%%rsp),%%rax\n\t"
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"mov\t%%rax,%0"
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: "=m"(uc->uc_mcontext.rsp)
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: /* no inputs */
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: "rax");
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asm volatile("mov\t(%%rsp),%%rax\n\t"
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"mov\t%%rax,%0"
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: "=m"(uc->uc_mcontext.rip)
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: /* no inputs */
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: "rax");
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return 0;
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}
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