mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-01-31 03:27:39 +00:00
d1d4388201
It hasn't been helpful enough to be justify the maintenance burden. What actually does help is mprotect(), kprintf(), --ftrace and --strace which can always be counted upon to work correctly. We aren't losing much with this change. Support for ASAN on AARCH64 was never implemented. Applying ASAN to the core libc runtimes was disabled many months ago. If there is some way to have an ASAN runtime for user programs that is less invasive we can potentially consider reintroducing support. But now is premature.
62 lines
2.7 KiB
C
62 lines
2.7 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
|
||
│ vi: set et ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi │
|
||
╞══════════════════════════════════════════════════════════════════════════════╡
|
||
│ Copyright 2020 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/dce.h"
|
||
#include "libc/str/str.h"
|
||
#ifndef __aarch64__
|
||
|
||
typedef char xmm_u __attribute__((__vector_size__(16), __aligned__(1)));
|
||
typedef char xmm_t __attribute__((__vector_size__(16), __aligned__(16)));
|
||
|
||
/**
|
||
* Copies bytes from 𝑠 to 𝑑 until a NUL is encountered.
|
||
*
|
||
* @param 𝑑 is destination memory
|
||
* @param 𝑠 is a NUL-terminated string
|
||
* @note 𝑑 and 𝑠 can't overlap
|
||
* @return pointer to nul byte
|
||
* @asyncsignalsafe
|
||
*/
|
||
__vex char *stpcpy(char *d, const char *s) {
|
||
size_t i = 0;
|
||
#if defined(__x86_64__) && !defined(__chibicc__)
|
||
for (; (uintptr_t)(s + i) & 15; ++i) {
|
||
if (!(d[i] = s[i])) {
|
||
return d + i;
|
||
}
|
||
}
|
||
for (;;) {
|
||
xmm_t z = {0};
|
||
xmm_t v = *(xmm_t *)(s + i);
|
||
if (!__builtin_ia32_pmovmskb128(v == z)) {
|
||
*(xmm_u *)(d + i) = v;
|
||
i += 16;
|
||
} else {
|
||
break;
|
||
}
|
||
}
|
||
#endif
|
||
for (;;) {
|
||
if (!(d[i] = s[i])) {
|
||
return d + i;
|
||
}
|
||
++i;
|
||
}
|
||
}
|
||
|
||
#endif /* __aarch64__ */
|