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authorRich Felker <dalias@aerifal.cx>2015-10-15 00:55:41 -0400
committerRich Felker <dalias@aerifal.cx>2015-10-15 00:55:41 -0400
commit11da520c7af5b190e69c0906c6e95000c4e59f33 (patch)
tree6f000c13fcb6e1a7881935514bcb1c5796d9f90c /arch/mips/pthread_arch.h
parent0ba35d69c0e77b225ec640d2bd112ff6d9d3b2af (diff)
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add comment documenting hard-coded opcode for reading mips thread pointer
Diffstat (limited to 'arch/mips/pthread_arch.h')
-rw-r--r--arch/mips/pthread_arch.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/mips/pthread_arch.h b/arch/mips/pthread_arch.h
index 904a2489..93edbd4e 100644
--- a/arch/mips/pthread_arch.h
+++ b/arch/mips/pthread_arch.h
@@ -5,6 +5,7 @@ static inline struct pthread *__pthread_self()
 	__asm__ __volatile__ (".word 0x7c03e83b ; move %0, $3" : "=r" (tp) : : "$3" );
 #else
 	register char *tp __asm__("$3");
+	/* rdhwr $3,$29 */
 	__asm__ __volatile__ (".word 0x7c03e83b" : "=r" (tp) );
 #endif
 	return (pthread_t)(tp - 0x7000 - sizeof(struct pthread));