109 строки
2.0 KiB
ArmAsm
109 строки
2.0 KiB
ArmAsm
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/*
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* linux/arch/unicore32/lib/copy_from_user.S
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*
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* Code specific to PKUnity SoC and UniCore ISA
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*
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* Copyright (C) 2001-2010 GUAN Xue-tao
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/linkage.h>
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#include <asm/assembler.h>
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/*
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* Prototype:
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*
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* size_t __copy_from_user(void *to, const void *from, size_t n)
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*
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* Purpose:
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*
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* copy a block to kernel memory from user memory
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*
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* Params:
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*
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* to = kernel memory
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* from = user memory
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* n = number of bytes to copy
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*
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* Return value:
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*
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* Number of bytes NOT copied.
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*/
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.macro ldr1w ptr reg abort
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ldrusr \reg, \ptr, 4, abort=\abort
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.endm
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.macro ldr4w ptr reg1 reg2 reg3 reg4 abort
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100: ldm.w (\reg1, \reg2, \reg3, \reg4), [\ptr]+
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.pushsection __ex_table, "a"
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.align 3
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.long 100b, \abort
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.popsection
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.endm
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.macro ldr8w ptr reg1 reg2 reg3 reg4 reg5 reg6 reg7 reg8 abort
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100: ldm.w (\reg1, \reg2, \reg3, \reg4, \reg5, \reg6, \reg7, \reg8), [\ptr]+
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.pushsection __ex_table, "a"
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.align 3
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.long 100b, \abort
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.popsection
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.endm
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.macro ldr1b ptr reg cond=al abort
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ldrusr \reg, \ptr, 1, \cond, abort=\abort
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.endm
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.macro str1w ptr reg abort
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stw.w \reg, [\ptr]+, #4
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.endm
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.macro str8w ptr reg1 reg2 reg3 reg4 reg5 reg6 reg7 reg8 abort
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stm.w (\reg1, \reg2, \reg3, \reg4, \reg5, \reg6, \reg7, \reg8), [\ptr]+
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.endm
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.macro str1b ptr reg cond=al abort
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.ifnc \cond, al
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b\cond 201f
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b 202f
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.endif
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201: stb.w \reg, [\ptr]+, #1
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202:
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.endm
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.macro enter
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mov r3, #0
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stm.w (r0, r2, r3), [sp-]
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.endm
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.macro exit
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add sp, sp, #8
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ldm.w (r0), [sp]+
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mov pc, lr
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.endm
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.text
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ENTRY(__copy_from_user)
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#include "copy_template.S"
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ENDPROC(__copy_from_user)
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.pushsection .fixup,"ax"
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.align 0
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copy_abort_preamble
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ldm.w (r1, r2), [sp]+
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sub r3, r0, r1
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rsub r2, r3, r2
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stw r2, [sp]
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mov r1, #0
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b.l memset
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ldw.w r0, [sp]+, #4
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copy_abort_end
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.popsection
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