1/* 2 * strncpy_from_user.S: Sparc64 strncpy from userspace. 3 * 4 * Copyright (C) 1997, 1999 Jakub Jelinek (jj@ultra.linux.cz) 5 */ 6 7#include <asm/asi.h> 8#include <asm/errno.h> 9 10 .data 11 .align 8 120: .xword 0x0101010101010101 13 14 .text 15 .align 32 16 17 /* Must return: 18 * 19 * -EFAULT for an exception 20 * count if we hit the buffer limit 21 * bytes copied if we hit a null byte 22 * (without the null byte) 23 * 24 * This implementation assumes: 25 * %o1 is 8 aligned => !(%o2 & 7) 26 * %o0 is 8 aligned (if not, it will be slooooow, but will work) 27 * 28 * This is optimized for the common case: 29 * in my stats, 90% of src are 8 aligned (even on sparc32) 30 * and average length is 18 or so. 31 */ 32 33 .globl __strncpy_from_user 34 .type __strncpy_from_user,#function 35__strncpy_from_user: 36 /* %o0=dest, %o1=src, %o2=count */ 37 andcc %o1, 7, %g0 ! IEU1 Group 38 bne,pn %icc, 30f ! CTI 39 add %o0, %o2, %g3 ! IEU0 4060: ldxa [%o1] %asi, %g1 ! Load Group 41 brlez,pn %o2, 10f ! CTI 42 mov %o0, %o3 ! IEU0 4350: sethi %hi(0b), %o4 ! IEU0 Group 44 ldx [%o4 + %lo(0b)], %o4 ! Load 45 sllx %o4, 7, %o5 ! IEU1 Group 461: sub %g1, %o4, %g2 ! IEU0 Group 47 stx %g1, [%o0] ! Store 48 add %o0, 8, %o0 ! IEU1 49 andcc %g2, %o5, %g0 ! IEU1 Group 50 bne,pn %xcc, 5f ! CTI 51 add %o1, 8, %o1 ! IEU0 52 cmp %o0, %g3 ! IEU1 Group 53 bl,a,pt %xcc, 1b ! CTI 5461: ldxa [%o1] %asi, %g1 ! Load 5510: retl ! CTI Group 56 mov %o2, %o0 ! IEU0 575: srlx %g2, 32, %g7 ! IEU0 Group 58 sethi %hi(0xff00), %o4 ! IEU1 59 andcc %g7, %o5, %g0 ! IEU1 Group 60 be,pn %icc, 2f ! CTI 61 or %o4, %lo(0xff00), %o4 ! IEU0 62 srlx %g1, 48, %g7 ! IEU0 Group 63 andcc %g7, %o4, %g0 ! IEU1 Group 64 be,pn %icc, 50f ! CTI 65 andcc %g7, 0xff, %g0 ! IEU1 Group 66 be,pn %icc, 51f ! CTI 67 srlx %g1, 32, %g7 ! IEU0 68 andcc %g7, %o4, %g0 ! IEU1 Group 69 be,pn %icc, 52f ! CTI 70 andcc %g7, 0xff, %g0 ! IEU1 Group 71 be,pn %icc, 53f ! CTI 722: andcc %g2, %o5, %g0 ! IEU1 Group 73 be,pn %icc, 2f ! CTI 74 srl %g1, 16, %g7 ! IEU0 75 andcc %g7, %o4, %g0 ! IEU1 Group 76 be,pn %icc, 54f ! CTI 77 andcc %g7, 0xff, %g0 ! IEU1 Group 78 be,pn %icc, 55f ! CTI 79 andcc %g1, %o4, %g0 ! IEU1 Group 80 be,pn %icc, 56f ! CTI 81 andcc %g1, 0xff, %g0 ! IEU1 Group 82 be,a,pn %icc, 57f ! CTI 83 sub %o0, %o3, %o0 ! IEU0 842: cmp %o0, %g3 ! IEU1 Group 85 bl,a,pt %xcc, 50b ! CTI 8662: ldxa [%o1] %asi, %g1 ! Load 87 retl ! CTI Group 88 mov %o2, %o0 ! IEU0 8950: sub %o0, %o3, %o0 90 retl 91 sub %o0, 8, %o0 9251: sub %o0, %o3, %o0 93 retl 94 sub %o0, 7, %o0 9552: sub %o0, %o3, %o0 96 retl 97 sub %o0, 6, %o0 9853: sub %o0, %o3, %o0 99 retl 100 sub %o0, 5, %o0 10154: sub %o0, %o3, %o0 102 retl 103 sub %o0, 4, %o0 10455: sub %o0, %o3, %o0 105 retl 106 sub %o0, 3, %o0 10756: sub %o0, %o3, %o0 108 retl 109 sub %o0, 2, %o0 11057: retl 111 sub %o0, 1, %o0 11230: brlez,pn %o2, 3f 113 sub %g0, %o2, %o3 114 add %o0, %o2, %o0 11563: lduba [%o1] %asi, %o4 1161: add %o1, 1, %o1 117 brz,pn %o4, 2f 118 stb %o4, [%o0 + %o3] 119 addcc %o3, 1, %o3 120 bne,pt %xcc, 1b 12164: lduba [%o1] %asi, %o4 1223: retl 123 mov %o2, %o0 1242: retl 125 add %o2, %o3, %o0 126 .size __strncpy_from_user, .-__strncpy_from_user 127 128 .section __ex_table,"a" 129 .align 4 130 .word 60b, __retl_efault 131 .word 61b, __retl_efault 132 .word 62b, __retl_efault 133 .word 63b, __retl_efault 134 .word 64b, __retl_efault 135 .previous 136