1/* 2 * linux/arch/arm/lib/copy_to_user.S 3 * 4 * Author: Nicolas Pitre 5 * Created: Sep 29, 2005 6 * Copyright: MontaVista Software, Inc. 7 * 8 * This program is free software; you can redistribute it and/or modify 9 * it under the terms of the GNU General Public License version 2 as 10 * published by the Free Software Foundation. 11 */ 12 13#include <linux/linkage.h> 14#include <asm/assembler.h> 15 16/* 17 * Prototype: 18 * 19 * size_t __copy_to_user(void *to, const void *from, size_t n) 20 * 21 * Purpose: 22 * 23 * copy a block to user memory from kernel memory 24 * 25 * Params: 26 * 27 * to = user memory 28 * from = kernel memory 29 * n = number of bytes to copy 30 * 31 * Return value: 32 * 33 * Number of bytes NOT copied. 34 */ 35 36#define LDR1W_SHIFT 0 37#ifndef CONFIG_THUMB2_KERNEL 38#define STR1W_SHIFT 0 39#else 40#define STR1W_SHIFT 1 41#endif 42 43 .macro ldr1w ptr reg abort 44 W(ldr) \reg, [\ptr], #4 45 .endm 46 47 .macro ldr4w ptr reg1 reg2 reg3 reg4 abort 48 ldmia \ptr!, {\reg1, \reg2, \reg3, \reg4} 49 .endm 50 51 .macro ldr8w ptr reg1 reg2 reg3 reg4 reg5 reg6 reg7 reg8 abort 52 ldmia \ptr!, {\reg1, \reg2, \reg3, \reg4, \reg5, \reg6, \reg7, \reg8} 53 .endm 54 55 .macro ldr1b ptr reg cond=al abort 56 ldr\cond\()b \reg, [\ptr], #1 57 .endm 58 59 .macro str1w ptr reg abort 60 strusr \reg, \ptr, 4, abort=\abort 61 .endm 62 63 .macro str8w ptr reg1 reg2 reg3 reg4 reg5 reg6 reg7 reg8 abort 64 str1w \ptr, \reg1, \abort 65 str1w \ptr, \reg2, \abort 66 str1w \ptr, \reg3, \abort 67 str1w \ptr, \reg4, \abort 68 str1w \ptr, \reg5, \abort 69 str1w \ptr, \reg6, \abort 70 str1w \ptr, \reg7, \abort 71 str1w \ptr, \reg8, \abort 72 .endm 73 74 .macro str1b ptr reg cond=al abort 75 strusr \reg, \ptr, 1, \cond, abort=\abort 76 .endm 77 78 .macro enter reg1 reg2 79 mov r3, #0 80 stmdb sp!, {r0, r2, r3, \reg1, \reg2} 81 .endm 82 83 .macro exit reg1 reg2 84 add sp, sp, #8 85 ldmfd sp!, {r0, \reg1, \reg2} 86 .endm 87 88 .text 89 90ENTRY(__copy_to_user_std) 91WEAK(__copy_to_user) 92 93#include "copy_template.S" 94 95ENDPROC(__copy_to_user) 96 97 .section .fixup,"ax" 98 .align 0 99 copy_abort_preamble 100 ldmfd sp!, {r1, r2, r3} 101 sub r0, r0, r1 102 rsb r0, r0, r2 103 copy_abort_end 104 .previous 105 106