1b2441318SGreg Kroah-Hartman/* SPDX-License-Identifier: GPL-2.0 */ 21da177e4SLinus Torvalds/* 31da177e4SLinus Torvalds * Just like strncpy() except that if a fault occurs during copying, 41da177e4SLinus Torvalds * -EFAULT is returned. 51da177e4SLinus Torvalds * 61da177e4SLinus Torvalds * Inputs: 71da177e4SLinus Torvalds * in0: address of destination buffer 81da177e4SLinus Torvalds * in1: address of string to be copied 91da177e4SLinus Torvalds * in2: length of buffer in bytes 101da177e4SLinus Torvalds * Outputs: 111da177e4SLinus Torvalds * r8: -EFAULT in case of fault or number of bytes copied if no fault 121da177e4SLinus Torvalds * 131da177e4SLinus Torvalds * Copyright (C) 1998-2001 Hewlett-Packard Co 141da177e4SLinus Torvalds * Copyright (C) 1998-2001 David Mosberger-Tang <davidm@hpl.hp.com> 151da177e4SLinus Torvalds * 161da177e4SLinus Torvalds * 00/03/06 D. Mosberger Fixed to return proper return value (bug found by 171da177e4SLinus Torvalds * by Andreas Schwab <schwab@suse.de>). 181da177e4SLinus Torvalds */ 191da177e4SLinus Torvalds 20*ab03e604SMasahiro Yamada#include <linux/export.h> 211da177e4SLinus Torvalds#include <asm/asmmacro.h> 221da177e4SLinus Torvalds 231da177e4SLinus TorvaldsGLOBAL_ENTRY(__strncpy_from_user) 241da177e4SLinus Torvalds alloc r2=ar.pfs,3,0,0,0 251da177e4SLinus Torvalds mov r8=0 261da177e4SLinus Torvalds mov r9=in1 271da177e4SLinus Torvalds ;; 281da177e4SLinus Torvalds add r10=in1,in2 291da177e4SLinus Torvalds cmp.eq p6,p0=r0,in2 301da177e4SLinus Torvalds(p6) br.ret.spnt.many rp 311da177e4SLinus Torvalds 321da177e4SLinus Torvalds // XXX braindead copy loop---this needs to be optimized 331da177e4SLinus Torvalds.Loop1: 341da177e4SLinus Torvalds EX(.Lexit, ld1 r8=[in1],1) 351da177e4SLinus Torvalds ;; 361da177e4SLinus Torvalds EX(.Lexit, st1 [in0]=r8,1) 371da177e4SLinus Torvalds cmp.ne p6,p7=r8,r0 381da177e4SLinus Torvalds ;; 391da177e4SLinus Torvalds(p6) cmp.ne.unc p8,p0=in1,r10 401da177e4SLinus Torvalds(p8) br.cond.dpnt.few .Loop1 411da177e4SLinus Torvalds ;; 421da177e4SLinus Torvalds(p6) mov r8=in2 // buffer filled up---return buffer length 431da177e4SLinus Torvalds(p7) sub r8=in1,r9,1 // return string length (excluding NUL character) 441da177e4SLinus Torvalds[.Lexit:] 451da177e4SLinus Torvalds br.ret.sptk.many rp 461da177e4SLinus TorvaldsEND(__strncpy_from_user) 47e007c533SAl ViroEXPORT_SYMBOL(__strncpy_from_user) 48