mirror of https://git.musl-libc.org/git/musl
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
49 lines
1.2 KiB
49 lines
1.2 KiB
#include <stdint.h>
|
|
#include <elf.h>
|
|
#include "pthread_impl.h"
|
|
#include "libc.h"
|
|
|
|
#define HWCAP_TLS (1 << 15)
|
|
|
|
extern const unsigned char __attribute__((__visibility__("hidden")))
|
|
__a_barrier_dummy[], __a_barrier_oldkuser[],
|
|
__a_barrier_v6[], __a_barrier_v7[],
|
|
__a_cas_dummy[], __a_cas_v6[], __a_cas_v7[],
|
|
__a_gettp_dummy[];
|
|
|
|
#define __a_barrier_kuser 0xffff0fa0
|
|
#define __a_cas_kuser 0xffff0fc0
|
|
#define __a_gettp_kuser 0xffff0fe0
|
|
|
|
extern uintptr_t __attribute__((__visibility__("hidden")))
|
|
__a_barrier_ptr, __a_cas_ptr, __a_gettp_ptr;
|
|
|
|
#define SET(op,ver) (__a_##op##_ptr = \
|
|
(uintptr_t)__a_##op##_##ver - (uintptr_t)__a_##op##_dummy)
|
|
|
|
int __set_thread_area(void *p)
|
|
{
|
|
#if !__ARM_ARCH_7A__ && !__ARM_ARCH_7R__ && __ARM_ARCH < 7
|
|
if (__hwcap & HWCAP_TLS) {
|
|
size_t *aux;
|
|
SET(cas, v7);
|
|
SET(barrier, v7);
|
|
for (aux=libc.auxv; *aux; aux+=2) {
|
|
if (*aux != AT_PLATFORM) continue;
|
|
const char *s = (void *)aux[1];
|
|
if (s[0]!='v' || s[1]!='6' || s[2]-'0'<10u) break;
|
|
SET(cas, v6);
|
|
SET(barrier, v6);
|
|
break;
|
|
}
|
|
} else {
|
|
int ver = *(int *)0xffff0ffc;
|
|
SET(gettp, kuser);
|
|
SET(cas, kuser);
|
|
SET(barrier, kuser);
|
|
if (ver < 2) a_crash();
|
|
if (ver < 3) SET(barrier, oldkuser);
|
|
}
|
|
#endif
|
|
return __syscall(0xf0005, p);
|
|
}
|
|
|