mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-02-01 03:53:33 +00:00
ec2cb88058
- Document more compiler flags - Expose new __print_maps() api - Better overflow checking in mmap() - Improve the shell example somewhat - Fix minor runtime bugs regarding stacks - Make kill() on fork()+execve()'d children work - Support CLONE_CHILD_CLEARTID for proper joining - Fix recent possible deadlock regression with --ftrace
97 lines
4.2 KiB
C
97 lines
4.2 KiB
C
/*-*- 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 2022 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/assert.h"
|
|
#include "libc/calls/calls.h"
|
|
#include "libc/dce.h"
|
|
#include "libc/errno.h"
|
|
#include "libc/nexgen32e/threaded.h"
|
|
#include "libc/nt/thread.h"
|
|
#include "libc/nt/thunk/msabi.h"
|
|
#include "libc/sysv/consts/nrlinux.h"
|
|
|
|
#define __NR_sysarch 0x000000a5
|
|
#define __NR___set_tcb 0x00000149
|
|
#define __NR__lwp_setprivate 0x0000013d
|
|
#define __NR_thread_fast_set_cthread_self 0x03000003
|
|
|
|
/**
|
|
* Initializes thread information block.
|
|
*
|
|
* Here's the layout your c library assumes:
|
|
*
|
|
* offset size description
|
|
* 0x0000 0x08 linear address pointer
|
|
* 0x0008 0x08 jmp_buf *exiter
|
|
* 0x0010 0x04 exit code
|
|
* 0x0030 0x08 linear address pointer
|
|
* 0x0038 0x04 tid
|
|
* 0x003c 0x04 errno
|
|
*
|
|
*/
|
|
privileged void *__initialize_tls(char tib[hasatleast 64]) {
|
|
*(intptr_t *)tib = (intptr_t)tib;
|
|
*(intptr_t *)(tib + 0x08) = 0;
|
|
*(int *)(tib + 0x10) = -1; // exit code
|
|
*(intptr_t *)(tib + 0x30) = (intptr_t)tib;
|
|
*(int *)(tib + 0x38) = -1; // tid
|
|
*(int *)(tib + 0x3c) = __errno;
|
|
return tib;
|
|
}
|
|
|
|
/**
|
|
* Installs thread information block on main process.
|
|
*/
|
|
privileged void __install_tls(char tib[hasatleast 64]) {
|
|
int ax, dx;
|
|
uint64_t magic;
|
|
unsigned char *p;
|
|
if (IsWindows()) {
|
|
if (!__tls_index) {
|
|
__tls_index = TlsAlloc();
|
|
}
|
|
asm("mov\t%1,%%gs:%0" : "=m"(*((long *)0x1480 + __tls_index)) : "r"(tib));
|
|
} else if (IsFreebsd()) {
|
|
asm volatile("syscall"
|
|
: "=a"(ax)
|
|
: "0"(__NR_sysarch), "D"(129), "S"(tib)
|
|
: "rcx", "r11", "memory", "cc");
|
|
} else if (IsXnu()) {
|
|
asm volatile("syscall"
|
|
: "=a"(ax)
|
|
: "0"(__NR_thread_fast_set_cthread_self),
|
|
"D"((intptr_t)tib - 0x30)
|
|
: "rcx", "r11", "memory", "cc");
|
|
} else if (IsOpenbsd()) {
|
|
asm volatile("syscall"
|
|
: "=a"(ax)
|
|
: "0"(__NR___set_tcb), "D"(tib)
|
|
: "rcx", "r11", "memory", "cc");
|
|
} else if (IsNetbsd()) {
|
|
asm volatile("syscall"
|
|
: "=a"(ax), "=d"(dx)
|
|
: "0"(__NR__lwp_setprivate), "D"(tib)
|
|
: "rcx", "r11", "memory", "cc");
|
|
} else {
|
|
asm volatile("syscall"
|
|
: "=a"(ax)
|
|
: "0"(__NR_linux_arch_prctl), "D"(ARCH_SET_FS), "S"(tib)
|
|
: "rcx", "r11", "memory");
|
|
}
|
|
__tls_enabled = true;
|
|
}
|