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cosmopolitan/libc/calls/getcontext.S

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Add getcontext() and setcontext() Fixes #413
2022-06-23 12:59:57 +00:00
/*-*- mode:unix-assembly; indent-tabs-mode:t; tab-width:8; coding:utf-8 -*-│
│vi: set et ft=asm ts=8 tw=8 fenc=utf-8 :vi│
╞══════════════════════════════════════════════════════════════════════════════╡
│ Copyright 2022 Justine Alexandra Roberts Tunney │
│ │
│ 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. │
│ │
│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
│ PERFORMANCE OF THIS SOFTWARE. │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/macros.internal.h"
// Gets machine state.
//
Hunt down more bugs After going through the MODE=dbg and MODE=zero build modes, a bunch of little issues were identified, which have been addressed. Fixing those issues created even more troubles for the project, because it improved our ability to detect latent problems which are getting fixed so fast.
2023-07-04 00:35:11 +00:00
// This function goes 14x slower if sigaction() has ever been used to
// install a signal handling function. If you don't care about signal
// safety and just want fast fibers, then you may override the global
// variable `__interruptible` to disable the sigprocmask() calls, for
// pure userspace context switching.
//
Implement swapcontext() and makecontext() This change introduces support for Linux-style uc_context manipulation that's fast and works well on all supported OSes and architectures. It also integrates with the Cosmpolitan runtime which can show backtraces comprised of multiple stacks and fibers. See the test and example code for further details. This will be used by Mold once it's been vendored
2023-07-02 10:50:29 +00:00
// @return 0 on success, or -1 w/ errno
// @see makecontext()
// @see swapcontext()
Add getcontext() and setcontext() Fixes #413
2022-06-23 12:59:57 +00:00
// @see setcontext()
Implement swapcontext() and makecontext() This change introduces support for Linux-style uc_context manipulation that's fast and works well on all supported OSes and architectures. It also integrates with the Cosmpolitan runtime which can show backtraces comprised of multiple stacks and fibers. See the test and example code for further details. This will be used by Mold once it's been vendored
2023-07-02 10:50:29 +00:00
// @threadsafe
.ftrace1
Add getcontext() and setcontext() Fixes #413
2022-06-23 12:59:57 +00:00
getcontext:
Implement swapcontext() and makecontext() This change introduces support for Linux-style uc_context manipulation that's fast and works well on all supported OSes and architectures. It also integrates with the Cosmpolitan runtime which can show backtraces comprised of multiple stacks and fibers. See the test and example code for further details. This will be used by Mold once it's been vendored
2023-07-02 10:50:29 +00:00
.ftrace2
#include "libc/calls/getcontext.inc"
jmp __getcontextsig
Add getcontext() and setcontext() Fixes #413
2022-06-23 12:59:57 +00:00
.endfn getcontext,globl
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