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08dbd0f8ef
Based on 1 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license version 2 and only version 2 as published by the free software foundation this program is distributed in the hope that it will be useful but without any warranty without even the implied warranty of merchantability or fitness for a particular purpose see the gnu general public license for more details you should have received a copy of the gnu general public license along with this program if not write to the free software foundation inc 51 franklin street fifth floor boston ma 02110 1301 usa extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 94 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Reviewed-by: Richard Fontana <rfontana@redhat.com> Reviewed-by: Alexios Zavras <alexios.zavras@intel.com> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190529141334.043630402@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
102 lines
1.6 KiB
ArmAsm
102 lines
1.6 KiB
ArmAsm
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* User memory copy functions for kernel
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*
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* Copyright (c) 2010-2011, The Linux Foundation. All rights reserved.
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*/
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/*
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* The right way to do this involves valignb
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* The easy way to do this is only speed up src/dest similar alignment.
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*/
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/*
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* Copy to/from user are the same, except that for packets with a load and
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* a store, I don't know how to tell which kind of exception we got.
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* Therefore, we duplicate the function, and handle faulting addresses
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* differently for each function
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*/
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/*
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* copy from user: loads can fault
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*/
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#define src_sav r13
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#define dst_sav r12
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#define src_dst_sav r13:12
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#define d_dbuf r15:14
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#define w_dbuf r15
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#define dst r0
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#define src r1
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#define bytes r2
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#define loopcount r5
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#define FUNCNAME raw_copy_from_user
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#include "copy_user_template.S"
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/* LOAD FAULTS from COPY_FROM_USER */
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/* Alignment loop. r2 has been updated. Return it. */
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.falign
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1009:
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2009:
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4009:
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{
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r0 = r2
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jumpr r31
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}
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/* Normal copy loops. Do epilog. Use src-src_sav to compute distance */
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/* X - (A - B) == X + B - A */
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.falign
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8089:
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{
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memd(dst) = d_dbuf
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r2 += sub(src_sav,src)
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}
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{
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r0 = r2
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jumpr r31
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}
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.falign
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4089:
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{
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memw(dst) = w_dbuf
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r2 += sub(src_sav,src)
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}
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{
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r0 = r2
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jumpr r31
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}
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.falign
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2089:
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{
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memh(dst) = w_dbuf
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r2 += sub(src_sav,src)
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}
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{
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r0 = r2
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jumpr r31
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}
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.falign
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1089:
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{
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memb(dst) = w_dbuf
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r2 += sub(src_sav,src)
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}
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{
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r0 = r2
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jumpr r31
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}
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/* COPY FROM USER: only loads can fail */
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.section __ex_table,"a"
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.long 1000b,1009b
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.long 2000b,2009b
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.long 4000b,4009b
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.long 8080b,8089b
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.long 4080b,4089b
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.long 2080b,2089b
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.long 1080b,1089b
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.previous
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