| 1 | /* SPDX-License-Identifier: GPL-2.0-only */
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| 2 | /*
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| 3 | * linux/arch/arm/lib/putuser.S
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| 4 | *
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| 5 | * Copyright (C) 2001 Russell King
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| 6 | *
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| 7 | * Idea from x86 version, (C) Copyright 1998 Linus Torvalds
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| 8 | *
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| 9 | * These functions have a non-standard call interface to make
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| 10 | * them more efficient, especially as they return an error
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| 11 | * value in addition to the "real" return value.
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| 12 | *
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| 13 | * __put_user_X
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| 14 | *
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| 15 | * Inputs: r0 contains the address
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| 16 | * r1 contains the address limit, which must be preserved
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| 17 | * r2, r3 contains the value
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| 18 | * Outputs: r0 is the error code
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| 19 | * lr corrupted
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| 20 | *
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| 21 | * No other registers must be altered. (see <asm/uaccess.h>
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| 22 | * for specific ASM register usage).
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| 23 | *
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| 24 | * Note that ADDR_LIMIT is either 0 or 0xc0000000
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| 25 | * Note also that it is intended that __put_user_bad is not global.
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| 26 | */
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| 27 | |
| 28 | |
| 29 | |
| 30 | |
| 31 |
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| 32 | ENTRY(__put_user_1)
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| 33 | check_uaccess r0, 1, r1, ip, __put_user_bad
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| 34 | 1: TUSER(strb) r2, [r0]
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| 35 | mov r0, |
| 36 | ret lr
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| 37 | ENDPROC(__put_user_1)
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| 38 |
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| 39 | ENTRY(__put_user_2)
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| 40 | check_uaccess r0, 2, r1, ip, __put_user_bad
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| 41 | |
| 42 |
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| 43 | 2: TUSER(strh) r2, [r0]
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| 44 |
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| 45 | |
| 46 |
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| 47 | mov ip, r2, lsr |
| 48 | |
| 49 | 2: TUSER(strb) r2, [r0], |
| 50 | 3: TUSER(strb) ip, [r0]
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| 51 | |
| 52 | 2: TUSER(strb) ip, [r0], |
| 53 | 3: TUSER(strb) r2, [r0]
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| 54 | |
| 55 |
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| 56 | |
| 57 | mov r0, |
| 58 | ret lr
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| 59 | ENDPROC(__put_user_2)
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| 60 |
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| 61 | ENTRY(__put_user_4)
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| 62 | check_uaccess r0, 4, r1, ip, __put_user_bad
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| 63 | 4: TUSER(str) r2, [r0]
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| 64 | mov r0, |
| 65 | ret lr
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| 66 | ENDPROC(__put_user_4)
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| 67 |
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| 68 | ENTRY(__put_user_8)
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| 69 | check_uaccess r0, 8, r1, ip, __put_user_bad
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| 70 | |
| 71 | 5: TUSER(str) r2, [r0]
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| 72 | 6: TUSER(str) r3, [r0, |
| 73 | |
| 74 | 5: TUSER(str) r2, [r0], |
| 75 | 6: TUSER(str) r3, [r0]
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| 76 | |
| 77 | mov r0, |
| 78 | ret lr
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| 79 | ENDPROC(__put_user_8)
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| 80 |
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| 81 | __put_user_bad:
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| 82 | mov r0, |
| 83 | ret lr
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| 84 | ENDPROC(__put_user_bad)
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| 85 |
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| 86 | .pushsection __ex_table, "a"
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| 87 | .long 1b, __put_user_bad
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| 88 | .long 2b, __put_user_bad
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| 89 | |
| 90 | .long 3b, __put_user_bad
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| 91 | |
| 92 | .long 4b, __put_user_bad
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| 93 | .long 5b, __put_user_bad
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| 94 | .long 6b, __put_user_bad
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| 95 | .popsection
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