diff options
Diffstat (limited to 'libc/private')
| -rw-r--r-- | libc/private/bionic_tls.h | 16 |
1 files changed, 13 insertions, 3 deletions
diff --git a/libc/private/bionic_tls.h b/libc/private/bionic_tls.h index 742ef8c..2412577 100644 --- a/libc/private/bionic_tls.h +++ b/libc/private/bionic_tls.h @@ -87,10 +87,20 @@ extern void __init_tls(void** tls, void* thread_info); extern int __set_tls(void *ptr); /* get the TLS */ -/* Linux kernel helpers for its TLS implementation */ #ifdef __arm__ -typedef void* (__kernel_get_tls_t)(void); -#define __get_tls (*(__kernel_get_tls_t *)0xffff0fe0) +/* Linux kernel helpers for its TLS implementation */ +/* For performance reasons, avoid calling the kernel helper + * Note that HAVE_ARM_TLS_REGISTER is build-specific + * (it must match your kernel configuration) + */ +# ifdef HAVE_ARM_TLS_REGISTER +# define __get_tls() \ + ({ register unsigned int __val asm("r0"); \ + asm ("mrc p15, 0, r0, c13, c0, 3" : "=r"(__val) ); \ + (volatile void*)__val; }) +# else /* !HAVE_ARM_TLS_REGISTER */ +# define __get_tls() ( *((volatile void **) 0xffff0ff0) ) +# endif #else extern void* __get_tls( void ); #endif |