mirror of
https://github.com/jart/cosmopolitan.git
synced 2024-05-18 03:22:40 +00:00
ae0ee59614
$ m=aarch64-tiny
$ make -j8 m=$m o/$m/tool/hello/hello.com o/third_party/qemu/qemu-aarch64
$ o/third_party/qemu/qemu-aarch64 o/$m/tool/hello/hello.com
hello world
$ ls -hal o/$m/tool/hello/hello.com
-rwxr-xr-x 1 jart jart 4.0K May 9 05:04 o/aarch64-tiny/tool/hello/hello.com
80 lines
3.7 KiB
C
80 lines
3.7 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 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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#ifdef __x86_64__
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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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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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}
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// Inline _Exit1() just in case _Exit() isn't allowed by pledge()
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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 if (IsWindows()) {
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ExitProcess(exitcode);
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}
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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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#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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"svc\t0"
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: /* no outputs */
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: "i"(94), "r"(x0)
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: "x8", "memory");
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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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