mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-02-01 12:03:41 +00:00
107 lines
4.3 KiB
C
107 lines
4.3 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/calls/internal.h"
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#include "libc/dce.h"
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#include "libc/nexgen32e/nt2sysv.h"
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#include "libc/nexgen32e/stackframe.h"
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#include "libc/nt/runtime.h"
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#include "libc/nt/thread.h"
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#include "libc/sysv/consts/clone.h"
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#include "libc/sysv/consts/nr.h"
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#include "libc/sysv/errfuns.h"
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struct WinThread {
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int (*func)(void *);
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void *param;
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void *stack;
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};
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static noasan textwindows uint32_t winthread(void *param) {
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struct WinThread *wt = param;
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asm volatile("mov\t%%rbp,%%r14\n\t"
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"mov\t%%rsp,%%r15\n\t"
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"xor\t%%ebp,%%ebp\n\t"
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"mov\t%2,%%rsp\n\t"
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"call\t*%0\n\t"
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"mov\t%%r14,%%rbp\n\t"
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"mov\t%%r15,%%rsp"
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: /* no outputs */
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: "m"(wt->func), "D"(wt->param), "m"(wt->stack)
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: "r14", "r15", "memory");
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return 0;
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}
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/**
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* Creates thread.
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*
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* @note CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND creates thread
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* @note CLONE_VFORK|CLONE_VM|SIGCHLD does vfork()
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* @note SIGCHLD does fork()
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*/
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privileged int clone(int (*f)(void *), void *stack, int flags, void *arg, ...) {
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int64_t h;
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va_list va;
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intptr_t ax;
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uint32_t tid;
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int32_t *ptid;
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register void *tls asm("r8");
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register int32_t *ctid asm("r10");
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register int (*func)(void *) asm("r9");
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if (IsLinux() || IsNetbsd()) {
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va_start(va, arg);
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ptid = va_arg(va, int32_t *);
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tls = va_arg(va, void *);
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ctid = va_arg(va, int32_t *);
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va_end(va);
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func = f;
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stack = (void *)(((uintptr_t)stack & -16) - 8);
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*(intptr_t *)stack = (intptr_t)arg;
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asm volatile("syscall"
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: "=a"(ax)
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: "0"(__NR_clone), "D"(flags), "S"(stack), "d"(ptid),
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"r"(ctid), "r"(tls), "r"(func)
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: "rcx", "r11", "memory");
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if (ax) return ax;
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asm volatile("xor\t%%ebp,%%ebp\n\t"
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"pop\t%%rdi\n\t"
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"call\t%1"
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: "=a"(ax)
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: "r"(func)
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: "memory");
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asm volatile("syscall"
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: /* no outputs */
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: "a"(__NR_exit), "D"(ax)
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: "memory");
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unreachable;
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} else if (IsWindows()) {
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if (flags == (CLONE_VM | CLONE_FS | CLONE_FILES | CLONE_SIGHAND)) {
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if ((h = CreateThread(0, PAGESIZE, NT2SYSV(winthread),
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&(struct WinThread){f, arg, stack}, 0, &tid))) {
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CloseHandle(h);
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return tid;
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} else {
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return __winerr();
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}
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} else {
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return einval();
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}
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} else {
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return enosys();
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}
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}
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