Thomas Gleixner | d2912cb | 2019-06-04 10:11:33 +0200 | [diff] [blame^] | 1 | /* SPDX-License-Identifier: GPL-2.0-only */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2 | /* |
| 3 | * linux/arch/arm/lib/getuser.S |
| 4 | * |
| 5 | * Copyright (C) 2001 Russell King |
| 6 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 7 | * Idea from x86 version, (C) Copyright 1998 Linus Torvalds |
| 8 | * |
| 9 | * These functions have a non-standard call interface to make them more |
| 10 | * efficient, especially as they return an error value in addition to |
| 11 | * the "real" return value. |
| 12 | * |
| 13 | * __get_user_X |
| 14 | * |
| 15 | * Inputs: r0 contains the address |
Russell King | 8404663 | 2012-09-07 18:22:28 +0100 | [diff] [blame] | 16 | * r1 contains the address limit, which must be preserved |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 17 | * Outputs: r0 is the error code |
Daniel Thompson | e38361d | 2014-07-10 20:58:08 +0100 | [diff] [blame] | 18 | * r2, r3 contains the zero-extended value |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 19 | * lr corrupted |
| 20 | * |
Russell King | 4baa992 | 2008-08-02 10:55:55 +0100 | [diff] [blame] | 21 | * No other registers must be altered. (see <asm/uaccess.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 22 | * for specific ASM register usage). |
| 23 | * |
| 24 | * Note that ADDR_LIMIT is either 0 or 0xc0000000. |
| 25 | * Note also that it is intended that __get_user_bad is not global. |
| 26 | */ |
Catalin Marinas | 93ed397 | 2008-08-28 11:22:32 +0100 | [diff] [blame] | 27 | #include <linux/linkage.h> |
Russell King | 8404663 | 2012-09-07 18:22:28 +0100 | [diff] [blame] | 28 | #include <asm/assembler.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 29 | #include <asm/errno.h> |
Catalin Marinas | 247055a | 2010-09-13 16:03:21 +0100 | [diff] [blame] | 30 | #include <asm/domain.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 31 | |
Catalin Marinas | 93ed397 | 2008-08-28 11:22:32 +0100 | [diff] [blame] | 32 | ENTRY(__get_user_1) |
Russell King | 8404663 | 2012-09-07 18:22:28 +0100 | [diff] [blame] | 33 | check_uaccess r0, 1, r1, r2, __get_user_bad |
Catalin Marinas | 4e7682d | 2012-01-25 11:38:13 +0100 | [diff] [blame] | 34 | 1: TUSER(ldrb) r2, [r0] |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 35 | mov r0, #0 |
Russell King | 6ebbf2c | 2014-06-30 16:29:12 +0100 | [diff] [blame] | 36 | ret lr |
Catalin Marinas | 93ed397 | 2008-08-28 11:22:32 +0100 | [diff] [blame] | 37 | ENDPROC(__get_user_1) |
Masami Hiramatsu | 0d73c3f | 2018-05-13 05:04:29 +0100 | [diff] [blame] | 38 | _ASM_NOKPROBE(__get_user_1) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 39 | |
Catalin Marinas | 93ed397 | 2008-08-28 11:22:32 +0100 | [diff] [blame] | 40 | ENTRY(__get_user_2) |
Russell King | 8404663 | 2012-09-07 18:22:28 +0100 | [diff] [blame] | 41 | check_uaccess r0, 2, r1, r2, __get_user_bad |
Vincent Whitchurch | 344eb553 | 2018-11-09 10:12:30 +0100 | [diff] [blame] | 42 | #if __LINUX_ARM_ARCH__ >= 6 |
| 43 | |
| 44 | 2: TUSER(ldrh) r2, [r0] |
| 45 | |
| 46 | #else |
| 47 | |
Russell King | 8404663 | 2012-09-07 18:22:28 +0100 | [diff] [blame] | 48 | #ifdef CONFIG_CPU_USE_DOMAINS |
| 49 | rb .req ip |
| 50 | 2: ldrbt r2, [r0], #1 |
| 51 | 3: ldrbt rb, [r0], #0 |
Catalin Marinas | 8b59278 | 2009-07-24 12:32:57 +0100 | [diff] [blame] | 52 | #else |
Russell King | 8404663 | 2012-09-07 18:22:28 +0100 | [diff] [blame] | 53 | rb .req r0 |
| 54 | 2: ldrb r2, [r0] |
| 55 | 3: ldrb rb, [r0, #1] |
Catalin Marinas | 8b59278 | 2009-07-24 12:32:57 +0100 | [diff] [blame] | 56 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 57 | #ifndef __ARMEB__ |
Russell King | 8404663 | 2012-09-07 18:22:28 +0100 | [diff] [blame] | 58 | orr r2, r2, rb, lsl #8 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 59 | #else |
Russell King | 8404663 | 2012-09-07 18:22:28 +0100 | [diff] [blame] | 60 | orr r2, rb, r2, lsl #8 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 61 | #endif |
Vincent Whitchurch | 344eb553 | 2018-11-09 10:12:30 +0100 | [diff] [blame] | 62 | |
| 63 | #endif /* __LINUX_ARM_ARCH__ >= 6 */ |
| 64 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 65 | mov r0, #0 |
Russell King | 6ebbf2c | 2014-06-30 16:29:12 +0100 | [diff] [blame] | 66 | ret lr |
Catalin Marinas | 93ed397 | 2008-08-28 11:22:32 +0100 | [diff] [blame] | 67 | ENDPROC(__get_user_2) |
Masami Hiramatsu | 0d73c3f | 2018-05-13 05:04:29 +0100 | [diff] [blame] | 68 | _ASM_NOKPROBE(__get_user_2) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 69 | |
Catalin Marinas | 93ed397 | 2008-08-28 11:22:32 +0100 | [diff] [blame] | 70 | ENTRY(__get_user_4) |
Russell King | 8404663 | 2012-09-07 18:22:28 +0100 | [diff] [blame] | 71 | check_uaccess r0, 4, r1, r2, __get_user_bad |
Catalin Marinas | 4e7682d | 2012-01-25 11:38:13 +0100 | [diff] [blame] | 72 | 4: TUSER(ldr) r2, [r0] |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 73 | mov r0, #0 |
Russell King | 6ebbf2c | 2014-06-30 16:29:12 +0100 | [diff] [blame] | 74 | ret lr |
Catalin Marinas | 93ed397 | 2008-08-28 11:22:32 +0100 | [diff] [blame] | 75 | ENDPROC(__get_user_4) |
Masami Hiramatsu | 0d73c3f | 2018-05-13 05:04:29 +0100 | [diff] [blame] | 76 | _ASM_NOKPROBE(__get_user_4) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 77 | |
Daniel Thompson | e38361d | 2014-07-10 20:58:08 +0100 | [diff] [blame] | 78 | ENTRY(__get_user_8) |
Kees Cook | 9e34404 | 2017-02-16 01:44:37 +0100 | [diff] [blame] | 79 | check_uaccess r0, 8, r1, r2, __get_user_bad8 |
Daniel Thompson | e38361d | 2014-07-10 20:58:08 +0100 | [diff] [blame] | 80 | #ifdef CONFIG_THUMB2_KERNEL |
| 81 | 5: TUSER(ldr) r2, [r0] |
| 82 | 6: TUSER(ldr) r3, [r0, #4] |
| 83 | #else |
| 84 | 5: TUSER(ldr) r2, [r0], #4 |
| 85 | 6: TUSER(ldr) r3, [r0] |
| 86 | #endif |
| 87 | mov r0, #0 |
| 88 | ret lr |
| 89 | ENDPROC(__get_user_8) |
Masami Hiramatsu | 0d73c3f | 2018-05-13 05:04:29 +0100 | [diff] [blame] | 90 | _ASM_NOKPROBE(__get_user_8) |
Daniel Thompson | e38361d | 2014-07-10 20:58:08 +0100 | [diff] [blame] | 91 | |
| 92 | #ifdef __ARMEB__ |
Victor Kamensky | d998138 | 2014-09-04 06:07:33 +0100 | [diff] [blame] | 93 | ENTRY(__get_user_32t_8) |
Daniel Thompson | e38361d | 2014-07-10 20:58:08 +0100 | [diff] [blame] | 94 | check_uaccess r0, 8, r1, r2, __get_user_bad |
| 95 | #ifdef CONFIG_CPU_USE_DOMAINS |
| 96 | add r0, r0, #4 |
| 97 | 7: ldrt r2, [r0] |
| 98 | #else |
| 99 | 7: ldr r2, [r0, #4] |
| 100 | #endif |
| 101 | mov r0, #0 |
| 102 | ret lr |
Victor Kamensky | d998138 | 2014-09-04 06:07:33 +0100 | [diff] [blame] | 103 | ENDPROC(__get_user_32t_8) |
Masami Hiramatsu | 0d73c3f | 2018-05-13 05:04:29 +0100 | [diff] [blame] | 104 | _ASM_NOKPROBE(__get_user_32t_8) |
Victor Kamensky | d998138 | 2014-09-04 06:07:33 +0100 | [diff] [blame] | 105 | |
| 106 | ENTRY(__get_user_64t_1) |
| 107 | check_uaccess r0, 1, r1, r2, __get_user_bad8 |
| 108 | 8: TUSER(ldrb) r3, [r0] |
| 109 | mov r0, #0 |
| 110 | ret lr |
| 111 | ENDPROC(__get_user_64t_1) |
Masami Hiramatsu | 0d73c3f | 2018-05-13 05:04:29 +0100 | [diff] [blame] | 112 | _ASM_NOKPROBE(__get_user_64t_1) |
Victor Kamensky | d998138 | 2014-09-04 06:07:33 +0100 | [diff] [blame] | 113 | |
| 114 | ENTRY(__get_user_64t_2) |
| 115 | check_uaccess r0, 2, r1, r2, __get_user_bad8 |
| 116 | #ifdef CONFIG_CPU_USE_DOMAINS |
| 117 | rb .req ip |
| 118 | 9: ldrbt r3, [r0], #1 |
| 119 | 10: ldrbt rb, [r0], #0 |
| 120 | #else |
| 121 | rb .req r0 |
| 122 | 9: ldrb r3, [r0] |
| 123 | 10: ldrb rb, [r0, #1] |
| 124 | #endif |
| 125 | orr r3, rb, r3, lsl #8 |
| 126 | mov r0, #0 |
| 127 | ret lr |
| 128 | ENDPROC(__get_user_64t_2) |
Masami Hiramatsu | 0d73c3f | 2018-05-13 05:04:29 +0100 | [diff] [blame] | 129 | _ASM_NOKPROBE(__get_user_64t_2) |
Victor Kamensky | d998138 | 2014-09-04 06:07:33 +0100 | [diff] [blame] | 130 | |
| 131 | ENTRY(__get_user_64t_4) |
| 132 | check_uaccess r0, 4, r1, r2, __get_user_bad8 |
| 133 | 11: TUSER(ldr) r3, [r0] |
| 134 | mov r0, #0 |
| 135 | ret lr |
| 136 | ENDPROC(__get_user_64t_4) |
Masami Hiramatsu | 0d73c3f | 2018-05-13 05:04:29 +0100 | [diff] [blame] | 137 | _ASM_NOKPROBE(__get_user_64t_4) |
Daniel Thompson | e38361d | 2014-07-10 20:58:08 +0100 | [diff] [blame] | 138 | #endif |
| 139 | |
| 140 | __get_user_bad8: |
| 141 | mov r3, #0 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 142 | __get_user_bad: |
| 143 | mov r2, #0 |
| 144 | mov r0, #-EFAULT |
Russell King | 6ebbf2c | 2014-06-30 16:29:12 +0100 | [diff] [blame] | 145 | ret lr |
Catalin Marinas | 93ed397 | 2008-08-28 11:22:32 +0100 | [diff] [blame] | 146 | ENDPROC(__get_user_bad) |
Daniel Thompson | e38361d | 2014-07-10 20:58:08 +0100 | [diff] [blame] | 147 | ENDPROC(__get_user_bad8) |
Masami Hiramatsu | 0d73c3f | 2018-05-13 05:04:29 +0100 | [diff] [blame] | 148 | _ASM_NOKPROBE(__get_user_bad) |
| 149 | _ASM_NOKPROBE(__get_user_bad8) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 150 | |
Russell King | 4260415 | 2010-04-19 10:15:03 +0100 | [diff] [blame] | 151 | .pushsection __ex_table, "a" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 152 | .long 1b, __get_user_bad |
| 153 | .long 2b, __get_user_bad |
Vincent Whitchurch | 344eb553 | 2018-11-09 10:12:30 +0100 | [diff] [blame] | 154 | #if __LINUX_ARM_ARCH__ < 6 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 155 | .long 3b, __get_user_bad |
Vincent Whitchurch | 344eb553 | 2018-11-09 10:12:30 +0100 | [diff] [blame] | 156 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 157 | .long 4b, __get_user_bad |
Daniel Thompson | e38361d | 2014-07-10 20:58:08 +0100 | [diff] [blame] | 158 | .long 5b, __get_user_bad8 |
| 159 | .long 6b, __get_user_bad8 |
| 160 | #ifdef __ARMEB__ |
| 161 | .long 7b, __get_user_bad |
Victor Kamensky | d998138 | 2014-09-04 06:07:33 +0100 | [diff] [blame] | 162 | .long 8b, __get_user_bad8 |
| 163 | .long 9b, __get_user_bad8 |
| 164 | .long 10b, __get_user_bad8 |
| 165 | .long 11b, __get_user_bad8 |
Daniel Thompson | e38361d | 2014-07-10 20:58:08 +0100 | [diff] [blame] | 166 | #endif |
Russell King | 4260415 | 2010-04-19 10:15:03 +0100 | [diff] [blame] | 167 | .popsection |