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Clean up some code

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- Use good ELF technique in cosmo_dlopen()
- Make strerror() conform more to other libc impls
- Introduce __clear_cache() and use it in cosmo_dlopen()
- Remove libc/fmt/fmt.h header (trying to kill off LIBC_FMT)
This commit is contained in:
Justine Tunney 2023-11-16 16:34:53 -08:00
parent 7010a8081e
commit 68c7c9c1e0
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GPG key ID: BE714B4575D6E328
244 changed files with 378 additions and 588 deletions
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37
libc/intrin/__clear_cache.c Normal file
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/*-*- 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 2023 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. │
╚─────────────────────────────────────────────────────────────────────────────*/
void __clear_cache2(const void *base, const void *end) {
#ifdef __aarch64__
int icache, dcache;
const char *p, *pe = end;
static unsigned int ctr_el0 = 0;
if (!ctr_el0) asm volatile("mrs\t%0,ctr_el0" : "=r"(ctr_el0));
icache = 4 << (ctr_el0 & 15);
dcache = 4 << ((ctr_el0 >> 16) & 15);
for (p = (const char *)((uintptr_t)base & -dcache); p < pe; p += dcache) {
asm volatile("dc\tcvau,%0" : : "r"(p) : "memory");
}
asm volatile("dsb\tish" ::: "memory");
for (p = (const char *)((uintptr_t)base & -icache); p < pe; p += icache) {
asm volatile("ic\tivau,%0" : : "r"(p) : "memory");
}
asm volatile("dsb\tish\nisb" ::: "memory");
#endif
}