mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-01-31 19:43:32 +00:00
23e235b7a5
This change integrates e58abc1110b335a3341e8ad5821ad8e3880d9bb2 from https://github.com/ahgamut/musl-cross-make/ which fixes the issues we were having with our C language extension for symbolic constants. This change also performs some code cleanup and bug fixes to getaddrinfo(). It's now possible to compile projects like ncurses, readline and python without needing to patch anything upstream, except maybe a line or two. Pretty soon it should be possible to build a Linux distro on Cosmo.
92 lines
4.3 KiB
C
92 lines
4.3 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/dce.h"
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#include "libc/intrin/asmflag.h"
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#include "libc/nt/thread.h"
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#include "libc/runtime/runtime.h"
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#include "libc/runtime/syslib.internal.h"
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#include "libc/sysv/consts/nr.h"
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#include "libc/thread/tls.h"
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__msabi extern typeof(ExitThread) *const __imp_ExitThread;
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/**
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* Terminates thread with raw system call.
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*
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* The function you want is pthread_exit(). If you call this function
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* whilst using the pthreads then your joiners might not get woken up
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* on non-Linux platforms where we zero __get_tls()->tib_tid manually
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*
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* If this is the main thread, or an orphaned child thread, then this
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* function is equivalent to exiting the process; however, `rc` shall
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* only be reported to the parent process on Linux, FreeBSD & Windows
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* whereas on other platforms, it'll be silently coerced to zero.
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*
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* @param rc only works on Linux and Windows
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* @see cthread_exit()
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* @threadsafe
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* @noreturn
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*/
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privileged wontreturn void _Exit1(int rc) {
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#ifdef __x86_64__
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char cf;
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int ax, dx, di, si;
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if (!IsWindows() && !IsMetal()) {
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// exit() on Linux
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// thr_exit() on FreeBSD
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// __threxit() on OpenBSD
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// __lwp_exit() on NetBSD
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// __bsdthread_terminate() on XNU
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asm volatile(CFLAG_ASM("xor\t%%r10d,%%r10d\n\t"
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"syscall")
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: CFLAG_CONSTRAINT(cf), "=a"(ax), "=d"(dx), "=D"(di), "=S"(si)
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: "1"(__NR_exit), "3"(IsLinux() ? rc : 0), "4"(0), "2"(0)
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: "rcx", "r8", "r9", "r10", "r11", "memory");
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if ((IsFreebsd() && !cf && !ax) || (SupportsFreebsd() && IsTiny())) {
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// FreeBSD checks if this is either the main thread by itself, or
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// the last running child thread in which case thr_exit() returns
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// zero with an error. In that case we'll exit the whole process.
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// FreeBSD thr_exit() can even clobber registers, like r8 and r9!
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asm volatile("syscall"
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: /* no outputs */
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: "a"(__NR_exit_group), "D"(rc)
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: "rcx", "r11", "memory");
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__builtin_unreachable();
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}
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} else if (IsWindows()) {
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__imp_ExitThread(rc);
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__builtin_unreachable();
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}
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notpossible;
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#elif defined(__aarch64__)
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if (IsLinux()) {
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register long r0 asm("x0") = rc;
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asm volatile("mov\tx8,%0\n\t"
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"svc\t0"
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: /* no outputs */
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: "i"(93), "r"(r0)
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: "x8", "memory");
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} else if (IsXnu()) {
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__syslib->pthread_exit(0);
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}
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notpossible;
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#else
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#error "arch unsupported"
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#endif
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}
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