minix/lib/libc/arch/arm/sys/__aeabi_read_tp.S

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ArmAsm
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#include "SYS.h"
ENTRY(__aeabi_read_tp)
mrc p15, 0, r0, c13, c0, 3
#ifndef _ARM_ARCH_6
cmp r0, #0 /* was it zero? */
RETc(ne) /* return it's not zero */
push {r1} /* syscall zeroes r1 */
SYSTRAP(_lwp_getprivate) /* can't fail */
pop {r1} /* restore r1 */
#endif
RET
_END(__aeabi_read_tp)