/* $Id: strncpy_from_user.S,v 1.5 1997/09/08 11:29:23 jj Exp $ * strncpy_from_user.S: Sparc64 strncpy from userspace. * * Copyright (C) 1997 Jakub Jelinek (jj@sunsite.mff.cuni.cz) */ #include #include .data .align 8 0: .xword 0x0101010101010101 .text .align 4 /* Must return: * * -EFAULT for an exception * count if we hit the buffer limit * bytes copied if we hit a null byte * (without the null byte) * * This implementation assumes: * %o1 is 8 aligned => !(%o2 & 7) * %o0 is 8 aligned (if not, it will be slooooow, but will work) * * This is optimized for the common case: * in my stats, 90% of src are 8 aligned (even on sparc32) * and average length is 18 or so. */ .globl __strncpy_from_user __strncpy_from_user: /* %o0=dest, %o1=src, %o2=count */ sethi %hi(0b), %o5 ! IEU0 Group andcc %o1, 7, %g0 ! IEU1 bne,pn %icc, 30f ! CTI ldx [%o5 + %lo(0b)], %o4 ! Load Group 60: ldxa [%o1] ASI_S, %g1 ! Load Group add %o1, %o2, %o1 ! IEU0 subcc %g0, %o2, %o3 ! IEU1 bgeu,pn %xcc, 10f ! CTI sllx %o4, 7, %o5 ! IEU0 Group add %o0, %o2, %o0 ! IEU1 1: sub %g1, %o4, %g2 ! IEU0 Group stx %g1, [%o0 + %o3] ! Store andcc %g2, %o5, %g0 ! IEU1 Group bne,pn %xcc, 5f ! CTI add %o3, 8, %o3 ! IEU0 brlz,a,pt %o3, 1b ! CTI(IEU1) Group 61: ldxa [%o1 + %o3] ASI_S, %g1 ! Load 10: retl ! CTI Group mov %o2, %o0 ! IEU0 5: srlx %g2, 32, %g7 ! IEU0 Group sethi %hi(0xff00), %g5 ! IEU1 andcc %g7, %o5, %g0 ! IEU1 Group be,pn %icc, 2f ! CTI or %g5, %lo(0xff00), %g5 ! IEU0 srlx %g1, 48, %g7 ! IEU0 Group andcc %g7, %g5, %g0 ! IEU1 Group be,pn %icc, 50f ! CTI andcc %g7, 0xff, %g0 ! IEU1 Group be,pn %icc, 51f ! CTI srlx %g1, 32, %g7 ! IEU0 andcc %g7, %g5, %g0 ! IEU1 Group be,pn %icc, 52f ! CTI andcc %g7, 0xff, %g0 ! IEU1 Group be,pn %icc, 53f ! CTI 2: andcc %g2, %o5, %g0 ! IEU1 Group be,pn %icc, 2f ! CTI srl %g1, 16, %g7 ! IEU0 andcc %g7, %g5, %g0 ! IEU1 Group be,pn %icc, 54f ! CTI andcc %g7, 0xff, %g0 ! IEU1 Group be,pn %icc, 55f ! CTI andcc %g1, %g5, %g0 ! IEU1 Group be,pn %icc, 56f ! CTI andcc %g1, 0xff, %g0 ! IEU1 Group be,a,pn %icc, 57f ! CTI add %o2, %o3, %o0 ! IEU0 2: brlz,a,pt %o3, 1b ! CTI(IEU1) Group 62: ldxa [%o1 + %o3] ASI_S, %g1 ! Load retl ! CTI Group mov %o2, %o0 ! IEU0 50: add %o2, %o3, %o0 retl sub %o0, 8, %o0 51: add %o2, %o3, %o0 retl sub %o0, 7, %o0 52: add %o2, %o3, %o0 retl sub %o0, 6, %o0 53: add %o2, %o3, %o0 retl sub %o0, 5, %o0 54: add %o2, %o3, %o0 retl sub %o0, 4, %o0 55: add %o2, %o3, %o0 retl sub %o0, 3, %o0 56: add %o2, %o3, %o0 retl sub %o0, 2, %o0 57: retl sub %o0, 1, %o0 30: brlez,pn %o2, 3f add %o1, %o2, %o1 sub %g0, %o2, %o3 add %o0, %o2, %o0 63: lduba [%o1 + %o3] ASI_S, %o4 1: brz,pn %o4, 2f stb %o4, [%o0 + %o3] addcc %o3, 1, %o3 bne,pt %xcc, 1b 64: lduba [%o1 + %o3] ASI_S, %o4 3: retl mov %o2, %o0 2: retl add %o2, %o3, %o0 .section .fixup,#alloc,#execinstr .align 4 4: retl mov -EFAULT, %o0 .section __ex_table,#alloc .align 4 .word 60b, 4b .word 61b, 4b .word 62b, 4b .word 63b, 4b .word 64b, 4b