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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 | /* strlen_user.S: Sparc optimized strlen_user code * * Return length of string in userspace including terminating 0 * or 0 for error * * Copyright (C) 1991,1996 Free Software Foundation * Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu) * Copyright (C) 1996 Jakub Jelinek (jj@sunsite.mff.cuni.cz) */ #include <asm/cprefix.h> #define LO_MAGIC 0x01010101 #define HI_MAGIC 0x80808080 10: ldub [%o0], %o5 cmp %o5, 0 be 1f add %o0, 1, %o0 andcc %o0, 3, %g0 be 4f or %o4, %lo(HI_MAGIC), %o3 11: ldub [%o0], %o5 cmp %o5, 0 be 2f add %o0, 1, %o0 andcc %o0, 3, %g0 be 5f sethi %hi(LO_MAGIC), %o4 12: ldub [%o0], %o5 cmp %o5, 0 be 3f add %o0, 1, %o0 b 13f or %o4, %lo(LO_MAGIC), %o2 1: retl mov 1, %o0 2: retl mov 2, %o0 3: retl mov 3, %o0 .align 4 .global C_LABEL(__strlen_user), C_LABEL(__strnlen_user) C_LABEL(__strlen_user): sethi %hi(32768), %o1 C_LABEL(__strnlen_user): mov %o1, %g1 mov %o0, %o1 andcc %o0, 3, %g0 bne 10b sethi %hi(HI_MAGIC), %o4 or %o4, %lo(HI_MAGIC), %o3 4: sethi %hi(LO_MAGIC), %o4 5: or %o4, %lo(LO_MAGIC), %o2 13: ld [%o0], %o5 2: sub %o5, %o2, %o4 andcc %o4, %o3, %g0 bne 82f add %o0, 4, %o0 sub %o0, %o1, %g2 81: cmp %g2, %g1 blu 13b mov %o0, %o4 ba,a 1f /* Check every byte. */ 82: srl %o5, 24, %g5 andcc %g5, 0xff, %g0 be 1f add %o0, -3, %o4 srl %o5, 16, %g5 andcc %g5, 0xff, %g0 be 1f add %o4, 1, %o4 srl %o5, 8, %g5 andcc %g5, 0xff, %g0 be 1f add %o4, 1, %o4 andcc %o5, 0xff, %g0 bne 81b sub %o0, %o1, %g2 add %o4, 1, %o4 1: retl sub %o4, %o1, %o0 .section .fixup,#alloc,#execinstr .align 4 9: retl clr %o0 .section __ex_table,#alloc .align 4 .word 10b, 9b .word 11b, 9b .word 12b, 9b .word 13b, 9b |