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Improve system call support

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Justine Tunney 2021-08-25 21:35:58 -07:00
parent 63b867bd2f
commit 3085ac7837
65 changed files with 900 additions and 544 deletions
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107
libc/runtime/clone.c Normal file
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@ -0,0 +1,107 @@
/*-*- 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/nt2sysv.h"
#include "libc/nexgen32e/stackframe.h"
#include "libc/nt/runtime.h"
#include "libc/nt/thread.h"
#include "libc/sysv/consts/clone.h"
#include "libc/sysv/consts/nr.h"
#include "libc/sysv/errfuns.h"
struct WinThread {
int (*func)(void *);
void *param;
void *stack;
};
static noasan textwindows uint32_t winthread(void *param) {
struct WinThread *wt = param;
asm volatile("mov\t%%rbp,%%r14\n\t"
"mov\t%%rsp,%%r15\n\t"
"xor\t%%ebp,%%ebp\n\t"
"mov\t%2,%%rsp\n\t"
"call\t*%0\n\t"
"mov\t%%r14,%%rbp\n\t"
"mov\t%%r15,%%rsp"
: /* no outputs */
: "m"(wt->func), "D"(wt->param), "m"(wt->stack)
: "r14", "r15", "memory");
return 0;
}
/**
* Creates thread.
*
* @note CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND creates thread
* @note CLONE_VFORK|CLONE_VM|SIGCHLD does vfork()
* @note SIGCHLD does fork()
*/
privileged int clone(int (*f)(void *), void *stack, int flags, void *arg, ...) {
int64_t h;
va_list va;
intptr_t ax;
uint32_t tid;
int32_t *ptid;
register void *tls asm("r8");
register int32_t *ctid asm("r10");
register int (*func)(void *) asm("r9");
if (IsLinux() || IsNetbsd()) {
va_start(va, arg);
ptid = va_arg(va, int32_t *);
tls = va_arg(va, void *);
ctid = va_arg(va, int32_t *);
va_end(va);
func = f;
stack = (void *)(((uintptr_t)stack & -16) - 8);
*(intptr_t *)stack = (intptr_t)arg;
asm volatile("syscall"
: "=a"(ax)
: "0"(__NR_clone), "D"(flags), "S"(stack), "d"(ptid),
"r"(ctid), "r"(tls), "r"(func)
: "rcx", "r11", "memory");
if (ax) return ax;
asm volatile("xor\t%%ebp,%%ebp\n\t"
"pop\t%%rdi\n\t"
"call\t%1"
: "=a"(ax)
: "r"(func)
: "memory");
asm volatile("syscall"
: /* no outputs */
: "a"(__NR_exit), "D"(ax)
: "memory");
unreachable;
} else if (IsWindows()) {
if (flags == (CLONE_VM | CLONE_FS | CLONE_FILES | CLONE_SIGHAND)) {
if ((h = CreateThread(0, PAGESIZE, NT2SYSV(winthread),
&(struct WinThread){f, arg, stack}, 0, &tid))) {
CloseHandle(h);
return tid;
} else {
return __winerr();
}
} else {
return einval();
}
} else {
return enosys();
}
}