/* * Just like strncpy() except that if a fault occurs during copying, * -EFAULT is returned. * * Inputs: * in0: address of destination buffer * in1: address of string to be copied * in2: length of buffer in bytes * Outputs: * r8: -EFAULT in case of fault or number of bytes copied if no fault * * Copyright (C) 1998-2001 Hewlett-Packard Co * Copyright (C) 1998-2001 David Mosberger-Tang <davidm@hpl.hp.com> * * 00/03/06 D. Mosberger Fixed to return proper return value (bug found by * by Andreas Schwab <schwab@suse.de>). */ #include <asm/asmmacro.h> GLOBAL_ENTRY(__strncpy_from_user) alloc r2=ar.pfs,3,0,0,0 mov r8=0 mov r9=in1 ;; add r10=in1,in2 cmp.eq p6,p0=r0,in2 (p6) br.ret.spnt.many rp // XXX braindead copy loop---this needs to be optimized .Loop1: EX(.Lexit, ld1 r8=[in1],1) ;; EX(.Lexit, st1 [in0]=r8,1) cmp.ne p6,p7=r8,r0 ;; (p6) cmp.ne.unc p8,p0=in1,r10 (p8) br.cond.dpnt.few .Loop1 ;; (p6) mov r8=in2 // buffer filled up---return buffer length (p7) sub r8=in1,r9,1 // return string length (excluding NUL character) [.Lexit:] br.ret.sptk.many rp END(__strncpy_from_user)