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