| /* SPDX-License-Identifier: GPL-2.0 */ | |
| /* | |
| * 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> | |
| #include <asm/export.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) | |
| EXPORT_SYMBOL(__strncpy_from_user) |