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101 lines
1.8 KiB
101 lines
1.8 KiB
/* SPDX-License-Identifier: GPL-2.0-or-later */ |
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/* |
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* OpenRISC string.S |
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* |
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* Linux architectural port borrowing liberally from similar works of |
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* others. All original copyrights apply as per the original source |
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* declaration. |
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* |
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* Modifications for the OpenRISC architecture: |
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* Copyright (C) 2003 Matjaz Breskvar <phoenix@bsemi.com> |
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* Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se> |
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*/ |
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#include <linux/linkage.h> |
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#include <asm/errno.h> |
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/* |
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* this can be optimized by doing gcc inline assemlby with |
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* proper constraints (no need to save args registers...) |
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* |
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*/ |
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/* |
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* |
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* int __copy_tofrom_user(void *to, const void *from, unsigned long size); |
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* |
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* NOTE: it returns number of bytes NOT copied !!! |
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* |
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*/ |
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.global __copy_tofrom_user |
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__copy_tofrom_user: |
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l.addi r1,r1,-12 |
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l.sw 0(r1),r6 |
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l.sw 4(r1),r4 |
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l.sw 8(r1),r3 |
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l.addi r11,r5,0 |
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2: l.sfeq r11,r0 |
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l.bf 1f |
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l.addi r11,r11,-1 |
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8: l.lbz r6,0(r4) |
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9: l.sb 0(r3),r6 |
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l.addi r3,r3,1 |
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l.j 2b |
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l.addi r4,r4,1 |
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1: |
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l.addi r11,r11,1 // r11 holds the return value |
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l.lwz r6,0(r1) |
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l.lwz r4,4(r1) |
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l.lwz r3,8(r1) |
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l.jr r9 |
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l.addi r1,r1,12 |
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.section .fixup, "ax" |
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99: |
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l.j 1b |
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l.nop |
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.previous |
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.section __ex_table, "a" |
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.long 8b, 99b // read fault |
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.long 9b, 99b // write fault |
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.previous |
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/* |
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* unsigned long clear_user(void *addr, unsigned long size) ; |
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* |
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* NOTE: it returns number of bytes NOT cleared !!! |
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*/ |
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.global __clear_user |
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__clear_user: |
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l.addi r1,r1,-8 |
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l.sw 0(r1),r4 |
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l.sw 4(r1),r3 |
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2: l.sfeq r4,r0 |
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l.bf 1f |
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l.addi r4,r4,-1 |
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9: l.sb 0(r3),r0 |
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l.j 2b |
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l.addi r3,r3,1 |
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1: |
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l.addi r11,r4,1 |
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l.lwz r4,0(r1) |
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l.lwz r3,4(r1) |
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l.jr r9 |
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l.addi r1,r1,8 |
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.section .fixup, "ax" |
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99: |
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l.j 1b |
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l.nop |
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.previous |
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.section __ex_table, "a" |
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.long 9b, 99b // write fault |
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.previous
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