add comment documenting hard-coded opcode for reading mips thread pointer
[musl.git] / arch / mips / pthread_arch.h
blob93edbd4ed42138b10eaa25d4b1f1a9fa4e3e3664
1 static inline struct pthread *__pthread_self()
3 #ifdef __clang__
4 char *tp;
5 __asm__ __volatile__ (".word 0x7c03e83b ; move %0, $3" : "=r" (tp) : : "$3" );
6 #else
7 register char *tp __asm__("$3");
8 /* rdhwr $3,$29 */
9 __asm__ __volatile__ (".word 0x7c03e83b" : "=r" (tp) );
10 #endif
11 return (pthread_t)(tp - 0x7000 - sizeof(struct pthread));
14 #define TLS_ABOVE_TP
15 #define TP_ADJ(p) ((char *)(p) + sizeof(struct pthread) + 0x7000)
17 #define DTP_OFFSET 0x8000
19 #define CANCEL_REG_IP (3-(union {int __i; char __b;}){1}.__b)