1/* SPDX-License-Identifier: GPL-2.0-only */ 2/* 3 * linux/arch/unicore32/lib/copy_to_user.S 4 * 5 * Code specific to PKUnity SoC and UniCore ISA 6 * 7 * Copyright (C) 2001-2010 GUAN Xue-tao 8 */ 9 10#include <linux/linkage.h> 11#include <asm/assembler.h> 12 13/* 14 * Prototype: 15 * 16 * size_t raw_copy_to_user(void *to, const void *from, size_t n) 17 * 18 * Purpose: 19 * 20 * copy a block to user memory from kernel memory 21 * 22 * Params: 23 * 24 * to = user memory 25 * from = kernel memory 26 * n = number of bytes to copy 27 * 28 * Return value: 29 * 30 * Number of bytes NOT copied. 31 */ 32 33 .macro ldr1w ptr reg abort 34 ldw.w \reg, [\ptr]+, #4 35 .endm 36 37 .macro ldr4w ptr reg1 reg2 reg3 reg4 abort 38 ldm.w (\reg1, \reg2, \reg3, \reg4), [\ptr]+ 39 .endm 40 41 .macro ldr8w ptr reg1 reg2 reg3 reg4 reg5 reg6 reg7 reg8 abort 42 ldm.w (\reg1, \reg2, \reg3, \reg4, \reg5, \reg6, \reg7, \reg8), [\ptr]+ 43 .endm 44 45 .macro ldr1b ptr reg cond=al abort 46 notcond \cond, .+8 47 ldb.w \reg, [\ptr]+, #1 48 .endm 49 50 .macro str1w ptr reg abort 51 strusr \reg, \ptr, 4, abort=\abort 52 .endm 53 54 .macro str8w ptr reg1 reg2 reg3 reg4 reg5 reg6 reg7 reg8 abort 55100: stm.w (\reg1, \reg2, \reg3, \reg4, \reg5, \reg6, \reg7, \reg8), [\ptr]+ 56 57 .pushsection __ex_table, "a" 58 .long 100b, \abort 59 .popsection 60 .endm 61 62 .macro str1b ptr reg cond=al abort 63 strusr \reg, \ptr, 1, \cond, abort=\abort 64 .endm 65 66 .macro enter 67 mov r3, #0 68 stm.w (r0, r2, r3), [sp-] 69 .endm 70 71 .macro exit 72 add sp, sp, #8 73 ldm.w (r0), [sp]+ 74 mov pc, lr 75 .endm 76 77 .text 78 79WEAK(raw_copy_to_user) 80 81#include "copy_template.S" 82 83ENDPROC(raw_copy_to_user) 84 85 .pushsection .fixup,"ax" 86 .align 0 87 copy_abort_preamble 88 ldm.w (r1, r2, r3), [sp]+ 89 sub r0, r0, r1 90 rsub r0, r0, r2 91 copy_abort_end 92 .popsection 93 94