1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
| | #include <stdint.h>
#include <elf.h>
#include "pthread_impl.h"
#include "libc.h"
#define HWCAP_TLS (1 << 15)
extern hidden const unsigned char
__a_barrier_oldkuser[], __a_barrier_v6[], __a_barrier_v7[],
__a_cas_v6[], __a_cas_v7[],
__a_gettp_cp15[], __a_gettp_syscall[];
#define __a_barrier_kuser 0xffff0fa0
#define __a_barrier_oldkuser (uintptr_t)__a_barrier_oldkuser
#define __a_barrier_v6 (uintptr_t)__a_barrier_v6
#define __a_barrier_v7 (uintptr_t)__a_barrier_v7
#define __a_cas_kuser 0xffff0fc0
#define __a_cas_v6 (uintptr_t)__a_cas_v6
#define __a_cas_v7 (uintptr_t)__a_cas_v7
#define __a_gettp_kuser 0xffff0fe0
#define __a_gettp_cp15 (uintptr_t)__a_gettp_cp15
extern hidden uintptr_t __a_barrier_ptr, __a_cas_ptr, __a_gettp_ptr;
int __set_thread_area(void *p)
{
#if __ARM_ARCH_6M__ || __ARM_ARCH_7M__ || __ARM_ARCH_7EM__ || (__ARM_ARCH > 7 && !__ARM_ARCH_ISA_ARM)
if (__hwcap & HWCAP_TLS) {
__a_gettp_ptr = __a_gettp_syscall;
} else {
a_crash();
}
#elif !__ARM_ARCH_7A__ && !__ARM_ARCH_7R__ && __ARM_ARCH < 7
if (__hwcap & HWCAP_TLS) {
size_t *aux;
__a_cas_ptr = __a_cas_v7;
__a_barrier_ptr = __a_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;
__a_cas_ptr = __a_cas_v6;
__a_barrier_ptr = __a_barrier_v6;
break;
}
} else {
int ver = *(int *)0xffff0ffc;
__a_gettp_ptr = __a_gettp_kuser;
__a_cas_ptr = __a_cas_kuser;
__a_barrier_ptr = __a_barrier_kuser;
if (ver < 2) a_crash();
if (ver < 3) __a_barrier_ptr = __a_barrier_oldkuser;
}
#endif
return __syscall(0xf0005, p);
}
|