github.com/afumu/libc@v0.0.6/musl/arch/arm/pthread_arch.h (about)

     1  #if ((__ARM_ARCH_6K__ || __ARM_ARCH_6KZ__ || __ARM_ARCH_6ZK__) && !__thumb__) \
     2   || __ARM_ARCH_7A__ || __ARM_ARCH_7R__ || __ARM_ARCH >= 7
     3  
     4  static inline pthread_t __pthread_self()
     5  {
     6  	char *p;
     7  	__asm__ ( "mrc p15,0,%0,c13,c0,3" : "=r"(p) );
     8  	return (void *)(p-sizeof(struct pthread));
     9  }
    10  
    11  #else
    12  
    13  #if __ARM_ARCH_4__ || __ARM_ARCH_4T__ || __ARM_ARCH == 4
    14  #define BLX "mov lr,pc\n\tbx"
    15  #else
    16  #define BLX "blx"
    17  #endif
    18  
    19  static inline pthread_t __pthread_self()
    20  {
    21  	extern hidden uintptr_t __a_gettp_ptr;
    22  	register uintptr_t p __asm__("r0");
    23  	__asm__ ( BLX " %1" : "=r"(p) : "r"(__a_gettp_ptr) : "cc", "lr" );
    24  	return (void *)(p-sizeof(struct pthread));
    25  }
    26  
    27  #endif
    28  
    29  #define TLS_ABOVE_TP
    30  #define GAP_ABOVE_TP 8
    31  #define TP_ADJ(p) ((char *)(p) + sizeof(struct pthread))
    32  
    33  #define MC_PC arm_pc