/*-*- 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 2021 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/calls/internal.h"
#include "libc/dce.h"
#include "libc/nexgen32e/vendor.internal.h"
#include "libc/nt/runtime.h"
#include "libc/nt/thunk/msabi.h"
#include "libc/sysv/consts/nr.h"

extern void(__msabi* __imp_ExitProcess)(uint32_t);

/**
 * Terminates process, ignoring destructors and atexit() handlers.
 *
 * When running on bare metal, this function will reboot your computer
 * by hosing the interrupt descriptors and triple faulting the system.
 *
 * @param exitcode is masked with 255
 * @asyncsignalsafe
 * @vforksafe
 * @noreturn
 */
privileged wontreturn void _Exit(int exitcode) {
  if ((!IsWindows() && !IsMetal()) || (IsMetal() && IsGenuineCosmo())) {
    asm volatile("syscall"
                 : /* no outputs */
                 : "a"(__NR_exit_group), "D"(exitcode)
                 : "memory");
  } else if (IsWindows()) {
    __imp_ExitProcess(exitcode & 0xff);
  }
  asm("push\t$0\n\t"
      "push\t$0\n\t"
      "cli\n\t"
      "lidt\t(%rsp)");
  for (;;) asm("ud2");
}
