mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-01-31 19:43:32 +00:00
fbc053e018
- Introduce __assert_disable global - Improve strsignal() thread safety - Make system call tracing thread safe - Fix SO_RCVTIMEO / SO_SNDTIMEO on Windows - Refactor DescribeFoo() functions into one place - Fix fork() on Windows when TLS and MAP_STACK exist - Round upwards in setsockopt(SO_RCVTIMEO) on Windows - Disable futexes on OpenBSD which seem extremely broken - Implement a better kludge for monotonic time on Windows
57 lines
2.7 KiB
C
57 lines
2.7 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│vi: set net ft=c ts=2 sts=2 sw=2 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/calls/calls.h"
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#include "libc/calls/syscall-sysv.internal.h"
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#include "libc/errno.h"
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#include "libc/nexgen32e/threaded.h"
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#include "libc/runtime/internal.h"
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#include "libc/runtime/runtime.h"
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static char tibdefault[64];
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extern int __threadcalls_end[];
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extern int __threadcalls_start[];
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void __enable_tls(void) {
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__initialize_tls(tibdefault);
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*(int *)((char *)tibdefault + 0x38) = sys_gettid();
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*(int *)((char *)tibdefault + 0x3c) = __errno;
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__install_tls(tibdefault);
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}
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privileged void __enable_threads(void) {
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__threaded = gettid();
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/*
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* _NOPL("__threadcalls", func)
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*
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* we have this
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*
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* 0f 1f 05 b1 19 00 00 nopl func(%rip)
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*
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* we're going to turn it into this
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*
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* 67 67 e8 b1 19 00 00 addr32 addr32 call func
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*/
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__morph_begin();
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for (int *p = __threadcalls_start; p < __threadcalls_end; ++p) {
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_base[*p + 0] = 0x67;
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_base[*p + 1] = 0x67;
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_base[*p + 2] = 0xe8;
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}
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__morph_end();
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}
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