mirror of
https://github.com/jart/cosmopolitan.git
synced 2024-05-17 02:52:40 +00:00
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 -*-│
|
|
│vi: set net ft=c ts=2 sts=2 sw=2 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/dce.h"
|
|
#include "libc/intrin/asmflag.h"
|
|
#include "libc/nt/thread.h"
|
|
#include "libc/runtime/runtime.h"
|
|
#include "libc/runtime/syslib.internal.h"
|
|
#include "libc/sysv/consts/nr.h"
|
|
#include "libc/thread/tls.h"
|
|
|
|
__msabi extern typeof(ExitThread) *const __imp_ExitThread;
|
|
|
|
/**
|
|
* Terminates thread with raw system call.
|
|
*
|
|
* The function you want is pthread_exit(). If you call this function
|
|
* whilst using the pthreads then your joiners might not get woken up
|
|
* on non-Linux platforms where we zero __get_tls()->tib_tid manually
|
|
*
|
|
* If this is the main thread, or an orphaned child thread, then this
|
|
* function is equivalent to exiting the process; however, `rc` shall
|
|
* only be reported to the parent process on Linux, FreeBSD & Windows
|
|
* whereas on other platforms, it'll be silently coerced to zero.
|
|
*
|
|
* @param rc only works on Linux and Windows
|
|
* @see cthread_exit()
|
|
* @noreturn
|
|
*/
|
|
wontreturn void _Exit1(int rc) {
|
|
#ifdef __x86_64__
|
|
char cf;
|
|
int ax, dx, di, si;
|
|
if (!IsWindows() && !IsMetal()) {
|
|
// exit() on Linux
|
|
// thr_exit() on FreeBSD
|
|
// __threxit() on OpenBSD
|
|
// __lwp_exit() on NetBSD
|
|
// __bsdthread_terminate() on XNU
|
|
asm volatile(CFLAG_ASM("xor\t%%r10d,%%r10d\n\t"
|
|
"syscall")
|
|
: CFLAG_CONSTRAINT(cf), "=a"(ax), "=d"(dx), "=D"(di), "=S"(si)
|
|
: "1"(__NR_exit), "3"(IsLinux() ? rc : 0), "4"(0), "2"(0)
|
|
: "rcx", "r8", "r9", "r10", "r11", "memory");
|
|
if ((IsFreebsd() && !cf && !ax) || (SupportsFreebsd() && IsTiny())) {
|
|
// FreeBSD checks if this is either the main thread by itself, or
|
|
// the last running child thread in which case thr_exit() returns
|
|
// zero with an error. In that case we'll exit the whole process.
|
|
// FreeBSD thr_exit() can even clobber registers, like r8 and r9!
|
|
asm volatile("syscall"
|
|
: /* no outputs */
|
|
: "a"(__NR_exit_group), "D"(rc)
|
|
: "rcx", "r11", "memory");
|
|
__builtin_unreachable();
|
|
}
|
|
} else if (IsWindows()) {
|
|
__imp_ExitThread(rc);
|
|
__builtin_unreachable();
|
|
}
|
|
notpossible;
|
|
#elif defined(__aarch64__)
|
|
if (IsLinux()) {
|
|
register long r0 asm("x0") = rc;
|
|
asm volatile("mov\tx8,%0\n\t"
|
|
"svc\t0"
|
|
: /* no outputs */
|
|
: "i"(93), "r"(r0)
|
|
: "x8", "memory");
|
|
} else if (IsXnu()) {
|
|
__syslib->__pthread_exit(0);
|
|
}
|
|
notpossible;
|
|
#else
|
|
#error "arch unsupported"
|
|
#endif
|
|
}
|