1/* strlen_user.S: Sparc optimized strlen_user code 2 * 3 * Return length of string in userspace including terminating 0 4 * or 0 for error 5 * 6 * Copyright (C) 1991,1996 Free Software Foundation 7 * Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu) 8 * Copyright (C) 1996 Jakub Jelinek (jj@sunsite.mff.cuni.cz) 9 */ 10 11#define LO_MAGIC 0x01010101 12#define HI_MAGIC 0x80808080 13 1410: 15 ldub [%o0], %o5 16 cmp %o5, 0 17 be 1f 18 add %o0, 1, %o0 19 andcc %o0, 3, %g0 20 be 4f 21 or %o4, %lo(HI_MAGIC), %o3 2211: 23 ldub [%o0], %o5 24 cmp %o5, 0 25 be 2f 26 add %o0, 1, %o0 27 andcc %o0, 3, %g0 28 be 5f 29 sethi %hi(LO_MAGIC), %o4 3012: 31 ldub [%o0], %o5 32 cmp %o5, 0 33 be 3f 34 add %o0, 1, %o0 35 b 13f 36 or %o4, %lo(LO_MAGIC), %o2 371: 38 retl 39 mov 1, %o0 402: 41 retl 42 mov 2, %o0 433: 44 retl 45 mov 3, %o0 46 47 .align 4 48 .global __strlen_user, __strnlen_user 49__strlen_user: 50 sethi %hi(32768), %o1 51__strnlen_user: 52 mov %o1, %g1 53 mov %o0, %o1 54 andcc %o0, 3, %g0 55 bne 10b 56 sethi %hi(HI_MAGIC), %o4 57 or %o4, %lo(HI_MAGIC), %o3 584: 59 sethi %hi(LO_MAGIC), %o4 605: 61 or %o4, %lo(LO_MAGIC), %o2 6213: 63 ld [%o0], %o5 642: 65 sub %o5, %o2, %o4 66 andcc %o4, %o3, %g0 67 bne 82f 68 add %o0, 4, %o0 69 sub %o0, %o1, %g2 7081: cmp %g2, %g1 71 blu 13b 72 mov %o0, %o4 73 ba,a 1f 74 75 /* Check every byte. */ 7682: srl %o5, 24, %g5 77 andcc %g5, 0xff, %g0 78 be 1f 79 add %o0, -3, %o4 80 srl %o5, 16, %g5 81 andcc %g5, 0xff, %g0 82 be 1f 83 add %o4, 1, %o4 84 srl %o5, 8, %g5 85 andcc %g5, 0xff, %g0 86 be 1f 87 add %o4, 1, %o4 88 andcc %o5, 0xff, %g0 89 bne 81b 90 sub %o0, %o1, %g2 91 92 add %o4, 1, %o4 931: 94 retl 95 sub %o4, %o1, %o0 96 97 .section .fixup,#alloc,#execinstr 98 .align 4 999: 100 retl 101 clr %o0 102 103 .section __ex_table,#alloc 104 .align 4 105 106 .word 10b, 9b 107 .word 11b, 9b 108 .word 12b, 9b 109 .word 13b, 9b 110