mirror of
https://github.com/jart/cosmopolitan.git
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b8a6a989c0
This change greatly reduces the number of modules that need to be compiled. The only issue right now is that sometimes when viewing symbol table entries, the aliased symbol is chosen.
95 lines
4.1 KiB
C
95 lines
4.1 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 2021 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/promises.internal.h"
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#include "libc/intrin/strace.internal.h"
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#include "libc/nexgen32e/vendor.internal.h"
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#include "libc/nt/runtime.h"
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#include "libc/runtime/runtime.h"
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#include "libc/sysv/consts/nr.h"
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/**
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* Terminates process, ignoring destructors and atexit() handlers.
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*
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* When running on bare metal, this function will reboot your computer
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* by hosing the interrupt descriptors and triple faulting the system.
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*
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* @param exitcode is masked with 255 on unix (but not windows)
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* @asyncsignalsafe
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* @threadsafe
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* @vforksafe
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* @noreturn
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*/
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wontreturn void _Exit(int exitcode) {
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int i;
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STRACE("_Exit(%d)", exitcode);
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if (!IsWindows() && !IsMetal()) {
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// On Linux _Exit1 (exit) must be called in pledge("") mode. If we
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// call _Exit (exit_group) when we haven't used pledge("stdio") then
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// it'll terminate the process instead. On OpenBSD we must not call
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// _Exit1 (__threxit) because only _Exit (exit) is whitelisted when
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// operating in pledge("") mode.
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if (!(IsLinux() && !PLEDGED(STDIO))) {
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#ifdef __x86_64__
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asm volatile("syscall"
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: /* no outputs */
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: "a"(__NR_exit_group), "D"(exitcode)
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: "rcx", "r11", "memory");
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#elif defined(__aarch64__)
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register long x0 asm("x0") = exitcode;
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asm volatile("mov\tx8,%0\n\t"
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"mov\tx16,%1\n\t"
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"svc\t0"
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: /* no outputs */
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: "i"(94), "i"(1), "r"(x0)
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: "x8", "x16", "memory");
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#else
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#error "unsupported architecture"
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#endif
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}
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// Inline _Exit1() just in case _Exit() isn't allowed by pledge()
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#ifdef __x86_64__
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asm volatile("syscall"
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: /* no outputs */
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: "a"(__NR_exit), "D"(exitcode)
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: "rcx", "r11", "memory");
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#else
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register long r0 asm("x0") = exitcode;
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asm volatile("mov\tx8,%0\n\t"
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"mov\tx16,%1\n\t"
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"svc\t0"
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: /* no outputs */
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: "i"(93), "i"(0x169), "r"(r0)
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: "x8", "memory");
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#endif
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} else if (IsWindows()) {
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ExitProcess(exitcode);
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}
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#ifdef __x86_64__
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asm("push\t$0\n\t"
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"push\t$0\n\t"
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"cli\n\t"
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"lidt\t(%rsp)");
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for (;;) asm("ud2");
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#else
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unreachable;
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#endif
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}
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__strong_reference(_Exit, _exit);
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