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author | GuanXuetao <gxt@mprc.pku.edu.cn> | 2011-02-26 10:49:26 (GMT) |
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committer | GuanXuetao <gxt@mprc.pku.edu.cn> | 2011-03-17 01:19:13 (GMT) |
commit | 77c93b2f2388b974253af4149aa025b4751f92ad (patch) | |
tree | 59b3c67518e2cae1f347a2c2bc738a234b349bb4 /arch/unicore32/lib/copy_from_user.S | |
parent | 28bab059a23aac6bb129b307410e5b63e132a290 (diff) | |
download | linux-fsl-qoriq-77c93b2f2388b974253af4149aa025b4751f92ad.tar.xz |
unicore32 additional architecture files: low-level lib: uaccess
This patch implements low-level uaccess libraries.
Signed-off-by: Guan Xuetao <gxt@mprc.pku.edu.cn>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Diffstat (limited to 'arch/unicore32/lib/copy_from_user.S')
-rw-r--r-- | arch/unicore32/lib/copy_from_user.S | 108 |
1 files changed, 108 insertions, 0 deletions
diff --git a/arch/unicore32/lib/copy_from_user.S b/arch/unicore32/lib/copy_from_user.S new file mode 100644 index 0000000..ab0767ea --- /dev/null +++ b/arch/unicore32/lib/copy_from_user.S @@ -0,0 +1,108 @@ +/* + * linux/arch/unicore32/lib/copy_from_user.S + * + * Code specific to PKUnity SoC and UniCore ISA + * + * Copyright (C) 2001-2010 GUAN Xue-tao + * + * 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_from_user(void *to, const void *from, size_t n) + * + * Purpose: + * + * copy a block to kernel memory from user memory + * + * Params: + * + * to = kernel memory + * from = user memory + * n = number of bytes to copy + * + * Return value: + * + * Number of bytes NOT copied. + */ + + .macro ldr1w ptr reg abort + ldrusr \reg, \ptr, 4, abort=\abort + .endm + + .macro ldr4w ptr reg1 reg2 reg3 reg4 abort +100: ldm.w (\reg1, \reg2, \reg3, \reg4), [\ptr]+ + .pushsection __ex_table, "a" + .align 3 + .long 100b, \abort + .popsection + .endm + + .macro ldr8w ptr reg1 reg2 reg3 reg4 reg5 reg6 reg7 reg8 abort +100: ldm.w (\reg1, \reg2, \reg3, \reg4, \reg5, \reg6, \reg7, \reg8), [\ptr]+ + .pushsection __ex_table, "a" + .align 3 + .long 100b, \abort + .popsection + .endm + + .macro ldr1b ptr reg cond=al abort + ldrusr \reg, \ptr, 1, \cond, abort=\abort + .endm + + .macro str1w ptr reg abort + stw.w \reg, [\ptr]+, #4 + .endm + + .macro str8w ptr reg1 reg2 reg3 reg4 reg5 reg6 reg7 reg8 abort + stm.w (\reg1, \reg2, \reg3, \reg4, \reg5, \reg6, \reg7, \reg8), [\ptr]+ + .endm + + .macro str1b ptr reg cond=al abort + .ifnc \cond, al + b\cond 201f + b 202f + .endif +201: stb.w \reg, [\ptr]+, #1 +202: + .endm + + .macro enter + mov r3, #0 + stm.w (r0, r2, r3), [sp-] + .endm + + .macro exit + add sp, sp, #8 + ldm.w (r0), [sp]+ + mov pc, lr + .endm + + .text + +ENTRY(__copy_from_user) + +#include "copy_template.S" + +ENDPROC(__copy_from_user) + + .pushsection .fixup,"ax" + .align 0 + copy_abort_preamble + ldm.w (r1, r2), [sp]+ + sub r3, r0, r1 + rsub r2, r3, r2 + stw r2, [sp] + mov r1, #0 + b.l memset + ldw.w r0, [sp]+, #4 + copy_abort_end + .popsection + |