| 1 | /* SPDX-License-Identifier: GPL-2.0-or-later */
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| 2 | /*
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| 3 | * OpenRISC string.S
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| 4 | *
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| 5 | * Linux architectural port borrowing liberally from similar works of
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| 6 | * others. All original copyrights apply as per the original source
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| 7 | * declaration.
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| 8 | *
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| 9 | * Modifications for the OpenRISC architecture:
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| 10 | * Copyright (C) 2003 Matjaz Breskvar <phoenix@bsemi.com>
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| 11 | * Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se>
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| 12 | */
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| 13 |
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| 14 | |
| 15 | |
| 16 |
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| 17 | /*
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| 18 | * this can be optimized by doing gcc inline assemlby with
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| 19 | * proper constraints (no need to save args registers...)
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| 20 | *
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| 21 | */
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| 22 |
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| 23 |
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| 24 | /*
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| 25 | *
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| 26 | * int __copy_tofrom_user(void *to, const void *from, unsigned long size);
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| 27 | *
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| 28 | * NOTE: it returns number of bytes NOT copied !!!
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| 29 | *
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| 30 | */
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| 31 | .global __copy_tofrom_user
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| 32 | __copy_tofrom_user:
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| 33 | l.addi r1,r1,-12
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| 34 | l.sw 0(r1),r6
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| 35 | l.sw 4(r1),r4
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| 36 | l.sw 8(r1),r3
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| 37 |
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| 38 | l.addi r11,r5,0
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| 39 | 2: l.sfeq r11,r0
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| 40 | l.bf 1f
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| 41 | l.addi r11,r11,-1
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| 42 | 8: l.lbz r6,0(r4)
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| 43 | 9: l.sb 0(r3),r6
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| 44 | l.addi r3,r3,1
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| 45 | l.j 2b
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| 46 | l.addi r4,r4,1
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| 47 | 1:
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| 48 | l.addi r11,r11,1 // r11 holds the return value
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| 49 |
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| 50 | l.lwz r6,0(r1)
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| 51 | l.lwz r4,4(r1)
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| 52 | l.lwz r3,8(r1)
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| 53 | l.jr r9
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| 54 | l.addi r1,r1,12
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| 55 |
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| 56 | .section .fixup, "ax"
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| 57 | 99:
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| 58 | l.j 1b
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| 59 | l.nop
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| 60 | .previous
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| 61 |
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| 62 | .section __ex_table, "a"
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| 63 | .long 8b, 99b // read fault
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| 64 | .long 9b, 99b // write fault
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| 65 | .previous
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| 66 |
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| 67 | /*
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| 68 | * unsigned long clear_user(void *addr, unsigned long size) ;
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| 69 | *
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| 70 | * NOTE: it returns number of bytes NOT cleared !!!
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| 71 | */
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| 72 | .global __clear_user
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| 73 | __clear_user:
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| 74 | l.addi r1,r1,-8
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| 75 | l.sw 0(r1),r4
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| 76 | l.sw 4(r1),r3
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| 77 |
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| 78 | 2: l.sfeq r4,r0
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| 79 | l.bf 1f
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| 80 | l.addi r4,r4,-1
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| 81 | 9: l.sb 0(r3),r0
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| 82 | l.j 2b
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| 83 | l.addi r3,r3,1
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| 84 |
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| 85 | 1:
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| 86 | l.addi r11,r4,1
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| 87 |
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| 88 | l.lwz r4,0(r1)
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| 89 | l.lwz r3,4(r1)
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| 90 | l.jr r9
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| 91 | l.addi r1,r1,8
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| 92 |
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| 93 | .section .fixup, "ax"
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| 94 | 99:
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| 95 | l.j 1b
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| 96 | l.nop
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| 97 | .previous
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| 98 |
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| 99 | .section __ex_table, "a"
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| 100 | .long 9b, 99b // write fault
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| 101 | .previous
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