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| /*
| * linux/arch/unicore32/lib/copy_to_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 raw_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.
| */
|
| .macro ldr1w ptr reg abort
| ldw.w \reg, [\ptr]+, #4
| .endm
|
| .macro ldr4w ptr reg1 reg2 reg3 reg4 abort
| ldm.w (\reg1, \reg2, \reg3, \reg4), [\ptr]+
| .endm
|
| .macro ldr8w ptr reg1 reg2 reg3 reg4 reg5 reg6 reg7 reg8 abort
| ldm.w (\reg1, \reg2, \reg3, \reg4, \reg5, \reg6, \reg7, \reg8), [\ptr]+
| .endm
|
| .macro ldr1b ptr reg cond=al abort
| notcond \cond, .+8
| ldb.w \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
| 100: stm.w (\reg1, \reg2, \reg3, \reg4, \reg5, \reg6, \reg7, \reg8), [\ptr]+
|
| .pushsection __ex_table, "a"
| .long 100b, \abort
| .popsection
| .endm
|
| .macro str1b ptr reg cond=al abort
| strusr \reg, \ptr, 1, \cond, abort=\abort
| .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
|
| WEAK(raw_copy_to_user)
|
| #include "copy_template.S"
|
| ENDPROC(raw_copy_to_user)
|
| .pushsection .fixup,"ax"
| .align 0
| copy_abort_preamble
| ldm.w (r1, r2, r3), [sp]+
| sub r0, r0, r1
| rsub r0, r0, r2
| copy_abort_end
| .popsection
|
|
