2 * linux/arch/unicore32/lib/copy_to_user.S
4 * Code specific to PKUnity SoC and UniCore ISA
6 * Copyright (C) 2001-2010 GUAN Xue-tao
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.
13 #include <linux/linkage.h>
14 #include <asm/assembler.h>
19 * size_t raw_copy_to_user(void *to, const void *from, size_t n)
23 * copy a block to user memory from kernel memory
28 * from = kernel memory
29 * n = number of bytes to copy
33 * Number of bytes NOT copied.
36 .macro ldr1w ptr reg abort
37 ldw.w \reg, [\ptr]+, #4
40 .macro ldr4w ptr reg1 reg2 reg3 reg4 abort
41 ldm.w (\reg1, \reg2, \reg3, \reg4), [\ptr]+
44 .macro ldr8w ptr reg1 reg2 reg3 reg4 reg5 reg6 reg7 reg8 abort
45 ldm.w (\reg1, \reg2, \reg3, \reg4, \reg5, \reg6, \reg7, \reg8), [\ptr]+
48 .macro ldr1b ptr reg cond=al abort
50 ldb.w \reg, [\ptr]+, #1
53 .macro str1w ptr reg abort
54 strusr \reg, \ptr, 4, abort=\abort
57 .macro str8w ptr reg1 reg2 reg3 reg4 reg5 reg6 reg7 reg8 abort
58 100: stm.w (\reg1, \reg2, \reg3, \reg4, \reg5, \reg6, \reg7, \reg8), [\ptr]+
60 .pushsection __ex_table, "a"
65 .macro str1b ptr reg cond=al abort
66 strusr \reg, \ptr, 1, \cond, abort=\abort
71 stm.w (r0, r2, r3), [sp-]
82 WEAK(raw_copy_to_user)
84 #include "copy_template.S"
86 ENDPROC(raw_copy_to_user)
88 .pushsection .fixup,"ax"
91 ldm.w (r1, r2, r3), [sp]+