Subversion Repositories planix.SVN

#include <sys/regdef.h>
#include <sys/asm.h>

.globl tas
.ent tas 2

tas:
.set noreorder
1:
        ori     t1, zero, 12345 /* t1 = 12345 */
        ll      t0, (a0)                /* t0 = *a0 */
        sc      t1, (a0)                /* *a0 = t1 if *a0 hasn't changed; t1=success */
        beq     t1, zero, 1b            /* repeat if *a0 did change */
        nop

        j $31                           /* return */
        or      v0, t0, zero            /* set return value on way out */

.set reorder
.end tas