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 8 extern 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 25 extern hidden uintptr_t __a_barrier_ptr, __a_cas_ptr, __a_gettp_ptr; 26 __set_thread_area(void * p)27int __set_thread_area(void *p) 28 { 29 #if defined(SYS_set_thread_area) && defined(__LITEOS_A__) 30 return __syscall(SYS_set_thread_area, p); 31 #else 32 #if !__ARM_ARCH_7A__ && !__ARM_ARCH_7R__ && __ARM_ARCH < 7 33 if (__hwcap & HWCAP_TLS) { 34 size_t *aux; 35 __a_cas_ptr = __a_cas_v7; 36 __a_barrier_ptr = __a_barrier_v7; 37 for (aux=libc.auxv; *aux; aux+=2) { 38 if (*aux != AT_PLATFORM) continue; 39 const char *s = (void *)aux[1]; 40 if (s[0]!='v' || s[1]!='6' || s[2]-'0'<10u) break; 41 __a_cas_ptr = __a_cas_v6; 42 __a_barrier_ptr = __a_barrier_v6; 43 break; 44 } 45 } else { 46 int ver = *(int *)0xffff0ffc; 47 __a_gettp_ptr = __a_gettp_kuser; 48 __a_cas_ptr = __a_cas_kuser; 49 __a_barrier_ptr = __a_barrier_kuser; 50 if (ver < 2) a_crash(); 51 if (ver < 3) __a_barrier_ptr = __a_barrier_oldkuser; 52 } 53 #endif 54 return __syscall(0xf0005, p); 55 #endif 56 } 57