mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-02-01 03:53:33 +00:00
e522aa3a07
- ASAN memory morgue is now lockless - Make C11 atomics header more portable - Rewrote pthread keys support to be lockless - Simplify Python's unicode table unpacking code - Make crash report write(2) closer to being atomic - Make it possible to strace/ftrace a single thread - ASAN now checks nul-terminated strings fast and properly - Windows fork() now restores TLS memory of calling thread
91 lines
3.7 KiB
C
91 lines
3.7 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/atomic.h"
|
|
#include "libc/dce.h"
|
|
#include "libc/intrin/asan.internal.h"
|
|
#include "libc/intrin/atomic.h"
|
|
#include "libc/intrin/extend.internal.h"
|
|
#include "libc/macros.internal.h"
|
|
#include "libc/runtime/memtrack.internal.h"
|
|
#include "libc/sysv/consts/map.h"
|
|
#include "libc/thread/thread.h"
|
|
#include "libc/thread/tls.h"
|
|
|
|
#define KMALLOC_ALIGN sizeof(intptr_t)
|
|
|
|
static struct {
|
|
char *endptr;
|
|
size_t total;
|
|
pthread_spinlock_t lock;
|
|
} g_kmalloc;
|
|
|
|
void __kmalloc_lock(void) {
|
|
pthread_spin_lock(&g_kmalloc.lock);
|
|
}
|
|
|
|
void __kmalloc_unlock(void) {
|
|
pthread_spin_unlock(&g_kmalloc.lock);
|
|
}
|
|
|
|
#ifdef _NOPL0
|
|
#define __kmalloc_lock() _NOPL0("__threadcalls", __kmalloc_lock)
|
|
#define __kmalloc_unlock() _NOPL0("__threadcalls", __kmalloc_unlock)
|
|
#endif
|
|
|
|
/**
|
|
* Allocates permanent memory.
|
|
*
|
|
* The code malloc() depends upon uses this function to allocate memory.
|
|
* The returned memory can't be freed, and leak detection is impossible.
|
|
* This function panics when memory isn't available.
|
|
*
|
|
* Memory returned by this function is aligned on the word size, and as
|
|
* such, kmalloc() shouldn't be used for vector operations.
|
|
*
|
|
* @return zero-initialized memory on success, or null w/ errno
|
|
* @raise ENOMEM if we require more vespene gas
|
|
*/
|
|
void *kmalloc(size_t size) {
|
|
char *p, *e;
|
|
size_t i, n, t;
|
|
n = ROUNDUP(size + (IsAsan() * 8), KMALLOC_ALIGN);
|
|
__kmalloc_lock();
|
|
t = g_kmalloc.total;
|
|
e = g_kmalloc.endptr;
|
|
i = t;
|
|
t += n;
|
|
p = (char *)kMemtrackKmallocStart;
|
|
if (!e) e = p;
|
|
if ((e = _extend(p, t, e, MAP_PRIVATE,
|
|
kMemtrackKmallocStart + kMemtrackKmallocSize))) {
|
|
g_kmalloc.endptr = e;
|
|
g_kmalloc.total = t;
|
|
} else {
|
|
p = 0;
|
|
}
|
|
__kmalloc_unlock();
|
|
if (p) {
|
|
_unassert(!((intptr_t)(p + i) & (KMALLOC_ALIGN - 1)));
|
|
if (IsAsan()) __asan_poison(p + i + size, n - size, kAsanHeapOverrun);
|
|
return p + i;
|
|
} else {
|
|
return 0;
|
|
}
|
|
}
|