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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 | /* * linux/arch/arm/lib/copy_to_user.S * * Author: Nicolas Pitre * Created: Sep 29, 2005 * Copyright: MontaVista Software, Inc. * * 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. */ #include <linux/linkage.h> #include <asm/assembler.h> /* * Prototype: * * size_t __copy_to_user(void *to, const void *from, size_t n) * * Purpose: * * copy a block to user memory from kernel memory * * Params: * * to = user memory * from = kernel memory * n = number of bytes to copy * * Return value: * * Number of bytes NOT copied. */ #define LDR1W_SHIFT 0 #ifndef CONFIG_THUMB2_KERNEL #define STR1W_SHIFT 0 #else #define STR1W_SHIFT 1 #endif .macro ldr1w ptr reg abort W(ldr) \reg, [\ptr], #4 .endm .macro ldr4w ptr reg1 reg2 reg3 reg4 abort ldmia \ptr!, {\reg1, \reg2, \reg3, \reg4} .endm .macro ldr8w ptr reg1 reg2 reg3 reg4 reg5 reg6 reg7 reg8 abort ldmia \ptr!, {\reg1, \reg2, \reg3, \reg4, \reg5, \reg6, \reg7, \reg8} .endm .macro ldr1b ptr reg cond=al abort ldr\cond\()b \reg, [\ptr], #1 .endm .macro str1w ptr reg abort strusr \reg, \ptr, 4, abort=\abort .endm .macro str8w ptr reg1 reg2 reg3 reg4 reg5 reg6 reg7 reg8 abort str1w \ptr, \reg1, \abort str1w \ptr, \reg2, \abort str1w \ptr, \reg3, \abort str1w \ptr, \reg4, \abort str1w \ptr, \reg5, \abort str1w \ptr, \reg6, \abort str1w \ptr, \reg7, \abort str1w \ptr, \reg8, \abort .endm .macro str1b ptr reg cond=al abort strusr \reg, \ptr, 1, \cond, abort=\abort .endm .macro enter reg1 reg2 mov r3, #0 stmdb sp!, {r0, r2, r3, \reg1, \reg2} .endm .macro exit reg1 reg2 add sp, sp, #8 ldmfd sp!, {r0, \reg1, \reg2} .endm .text ENTRY(__copy_to_user_std) WEAK(__copy_to_user) #include "copy_template.S" ENDPROC(__copy_to_user) ENDPROC(__copy_to_user_std) .pushsection .fixup,"ax" .align 0 copy_abort_preamble ldmfd sp!, {r1, r2, r3} sub r0, r0, r1 rsb r0, r0, r2 copy_abort_end .popsection |