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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 | /* * linux/arch/arm/lib/getuser.S * * Copyright (C) 2001 Russell King * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. * * Idea from x86 version, (C) Copyright 1998 Linus Torvalds * * These functions have a non-standard call interface to make them more * efficient, especially as they return an error value in addition to * the "real" return value. * * __get_user_X * * Inputs: r0 contains the address * r1 contains the address limit, which must be preserved * Outputs: r0 is the error code * r2, r3 contains the zero-extended value * lr corrupted * * No other registers must be altered. (see <asm/uaccess.h> * for specific ASM register usage). * * Note that ADDR_LIMIT is either 0 or 0xc0000000. * Note also that it is intended that __get_user_bad is not global. */ #include <linux/linkage.h> #include <asm/assembler.h> #include <asm/errno.h> #include <asm/domain.h> ENTRY(__get_user_1) check_uaccess r0, 1, r1, r2, __get_user_bad 1: TUSER(ldrb) r2, [r0] mov r0, #0 ret lr ENDPROC(__get_user_1) ENTRY(__get_user_2) check_uaccess r0, 2, r1, r2, __get_user_bad #ifdef CONFIG_CPU_USE_DOMAINS rb .req ip 2: ldrbt r2, [r0], #1 3: ldrbt rb, [r0], #0 #else rb .req r0 2: ldrb r2, [r0] 3: ldrb rb, [r0, #1] #endif #ifndef __ARMEB__ orr r2, r2, rb, lsl #8 #else orr r2, rb, r2, lsl #8 #endif mov r0, #0 ret lr ENDPROC(__get_user_2) ENTRY(__get_user_4) check_uaccess r0, 4, r1, r2, __get_user_bad 4: TUSER(ldr) r2, [r0] mov r0, #0 ret lr ENDPROC(__get_user_4) ENTRY(__get_user_8) check_uaccess r0, 8, r1, r2, __get_user_bad #ifdef CONFIG_THUMB2_KERNEL 5: TUSER(ldr) r2, [r0] 6: TUSER(ldr) r3, [r0, #4] #else 5: TUSER(ldr) r2, [r0], #4 6: TUSER(ldr) r3, [r0] #endif mov r0, #0 ret lr ENDPROC(__get_user_8) #ifdef __ARMEB__ ENTRY(__get_user_32t_8) check_uaccess r0, 8, r1, r2, __get_user_bad #ifdef CONFIG_CPU_USE_DOMAINS add r0, r0, #4 7: ldrt r2, [r0] #else 7: ldr r2, [r0, #4] #endif mov r0, #0 ret lr ENDPROC(__get_user_32t_8) ENTRY(__get_user_64t_1) check_uaccess r0, 1, r1, r2, __get_user_bad8 8: TUSER(ldrb) r3, [r0] mov r0, #0 ret lr ENDPROC(__get_user_64t_1) ENTRY(__get_user_64t_2) check_uaccess r0, 2, r1, r2, __get_user_bad8 #ifdef CONFIG_CPU_USE_DOMAINS rb .req ip 9: ldrbt r3, [r0], #1 10: ldrbt rb, [r0], #0 #else rb .req r0 9: ldrb r3, [r0] 10: ldrb rb, [r0, #1] #endif orr r3, rb, r3, lsl #8 mov r0, #0 ret lr ENDPROC(__get_user_64t_2) ENTRY(__get_user_64t_4) check_uaccess r0, 4, r1, r2, __get_user_bad8 11: TUSER(ldr) r3, [r0] mov r0, #0 ret lr ENDPROC(__get_user_64t_4) #endif __get_user_bad8: mov r3, #0 __get_user_bad: mov r2, #0 mov r0, #-EFAULT ret lr ENDPROC(__get_user_bad) ENDPROC(__get_user_bad8) .pushsection __ex_table, "a" .long 1b, __get_user_bad .long 2b, __get_user_bad .long 3b, __get_user_bad .long 4b, __get_user_bad .long 5b, __get_user_bad8 .long 6b, __get_user_bad8 #ifdef __ARMEB__ .long 7b, __get_user_bad .long 8b, __get_user_bad8 .long 9b, __get_user_bad8 .long 10b, __get_user_bad8 .long 11b, __get_user_bad8 #endif .popsection |