mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-01-31 19:43:32 +00:00
bcf9af94bf
- Now using 10x better GCD semaphores - We now generate Linux-like thread ids - We now use fast system clock / sleep libraries - The APE M1 loader now generates Linux-like stacks
70 lines
3.3 KiB
C
70 lines
3.3 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 "ape/sections.internal.h"
|
|
#include "libc/assert.h"
|
|
#include "libc/calls/calls.h"
|
|
#include "libc/calls/struct/sigset.h"
|
|
#include "libc/calls/syscall-sysv.internal.h"
|
|
#include "libc/intrin/strace.internal.h"
|
|
#include "libc/runtime/morph.h"
|
|
#include "libc/runtime/runtime.h"
|
|
#include "libc/thread/tls.h"
|
|
|
|
extern int __threadcalls_end[];
|
|
extern int __threadcalls_start[];
|
|
#pragma weak __threadcalls_start
|
|
#pragma weak __threadcalls_end
|
|
|
|
static privileged dontinline void FixupLockNops(void) {
|
|
sigset_t mask;
|
|
__morph_begin(&mask);
|
|
/*
|
|
* _NOPL("__threadcalls", func)
|
|
*
|
|
* The big ugly macro above is used by Cosmopolitan Libc to unser
|
|
* locking primitive (e.g. flockfile, funlockfile) have zero impact on
|
|
* performance and binary size when threads aren't actually in play.
|
|
*
|
|
* we have this
|
|
*
|
|
* 0f 1f 05 b1 19 00 00 nopl func(%rip)
|
|
*
|
|
* we're going to turn it into this
|
|
*
|
|
* 67 67 e8 b1 19 00 00 addr32 addr32 call func
|
|
*
|
|
* This is cheap and fast because the big ugly macro stored in the
|
|
* binary the offsets of all the instructions we need to change.
|
|
*/
|
|
for (int *p = __threadcalls_start; p < __threadcalls_end; ++p) {
|
|
__executable_start[*p + 0] = 0x67;
|
|
__executable_start[*p + 1] = 0x67;
|
|
__executable_start[*p + 2] = 0xe8;
|
|
}
|
|
__morph_end(&mask);
|
|
}
|
|
|
|
void __enable_threads(void) {
|
|
if (__threaded) return;
|
|
#ifdef __x86_64__
|
|
STRACE("__enable_threads()");
|
|
FixupLockNops();
|
|
#endif
|
|
__threaded = __tls_enabled ? __get_tls()->tib_tid : sys_gettid();
|
|
}
|