diff options
Diffstat (limited to '')
-rw-r--r-- | libc-top-half/musl/src/thread/arm/__set_thread_area.c | 52 |
1 files changed, 52 insertions, 0 deletions
diff --git a/libc-top-half/musl/src/thread/arm/__set_thread_area.c b/libc-top-half/musl/src/thread/arm/__set_thread_area.c new file mode 100644 index 0000000..09de65a --- /dev/null +++ b/libc-top-half/musl/src/thread/arm/__set_thread_area.c @@ -0,0 +1,52 @@ +#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[]; + +#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_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); +} |