mirror of
https://github.com/jart/cosmopolitan.git
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91 lines
3.9 KiB
C
91 lines
3.9 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│ vi: set et 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/calls/syscall-sysv.internal.h"
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#include "libc/dce.h"
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#include "libc/intrin/kprintf.h"
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#include "libc/nt/thread.h"
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#include "libc/nt/thunk/msabi.h"
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#include "libc/runtime/internal.h"
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__msabi extern typeof(GetCurrentThreadId) *const __imp_GetCurrentThreadId;
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int sys_gettid(void) {
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int64_t wut;
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#ifdef __x86_64__
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int tid;
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if (IsWindows()) {
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tid = __imp_GetCurrentThreadId();
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} else if (IsLinux()) {
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asm("syscall"
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: "=a"(tid) // man says always succeeds
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: "0"(186) // __NR_gettid
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: "rcx", "r11", "memory");
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} else if (IsXnu()) {
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asm("syscall" // xnu/osfmk/kern/ipc_tt.c
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: "=a"(tid) // assume success
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: "0"(0x1000000 | 27) // Mach thread_self_trap()
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: "rcx", "r8", "r9", "r10", "r11", "memory", "cc");
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} else if (IsOpenbsd()) {
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asm("syscall"
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: "=a"(tid) // man says always succeeds
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: "0"(299) // getthrid()
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: "rcx", "r8", "r9", "r10", "r11", "memory", "cc");
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} else if (IsNetbsd()) {
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asm("syscall"
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: "=a"(tid) // man says always succeeds
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: "0"(311) // _lwp_self()
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: "rcx", "rdx", "r8", "r9", "r10", "r11", "memory", "cc");
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} else if (IsFreebsd()) {
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asm("syscall"
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: "=a"(tid), // only fails w/ EFAULT, which isn't possible
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"=m"(wut) // must be 64-bit
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: "0"(432), // thr_self()
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"D"(&wut) // but not actually 64-bit
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: "rcx", "r8", "r9", "r10", "r11", "memory", "cc");
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tid = wut;
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} else {
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tid = __pid;
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}
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return tid;
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#elif defined(__aarch64__)
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// this can't be used on xnu
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register long res asm("x0");
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if (IsLinux()) {
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asm volatile("mov\tx8,%1\n\t"
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"svc\t0"
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: "=r"(res)
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: "i"(178)
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: "x8", "memory");
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} else if (IsFreebsd()) {
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res = (long)&wut;
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asm volatile("mov\tx8,%2\n\t"
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"svc\t0"
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: "+r"(res), "=m"(wut)
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: "i"(432) // thr_self()
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: "x8", "memory");
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res = wut;
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} else {
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res = __pid;
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}
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return res;
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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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