c4a84ae39b
This moves all fixup snippets to the .text.fixup section, which is a special section that gets emitted along with the .text section for each input object file, i.e., the snippets are kept much closer to the code they refer to, which helps prevent linker failure on large kernels. Acked-by: Nicolas Pitre <nico@linaro.org> Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
111 lines
2.1 KiB
ArmAsm
111 lines
2.1 KiB
ArmAsm
/*
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* linux/arch/arm/lib/copy_to_user.S
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*
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* Author: Nicolas Pitre
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* Created: Sep 29, 2005
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* Copyright: MontaVista Software, Inc.
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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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#include <asm/unwind.h>
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/*
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* Prototype:
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*
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* size_t __copy_to_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 user memory from kernel memory
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*
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* Params:
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*
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* to = user memory
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* from = kernel 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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#define LDR1W_SHIFT 0
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#ifndef CONFIG_THUMB2_KERNEL
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#define STR1W_SHIFT 0
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#else
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#define STR1W_SHIFT 1
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#endif
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.macro ldr1w ptr reg abort
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W(ldr) \reg, [\ptr], #4
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.endm
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.macro ldr4w ptr reg1 reg2 reg3 reg4 abort
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ldmia \ptr!, {\reg1, \reg2, \reg3, \reg4}
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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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ldmia \ptr!, {\reg1, \reg2, \reg3, \reg4, \reg5, \reg6, \reg7, \reg8}
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.endm
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.macro ldr1b ptr reg cond=al abort
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ldr\cond\()b \reg, [\ptr], #1
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.endm
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.macro str1w ptr reg abort
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strusr \reg, \ptr, 4, abort=\abort
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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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str1w \ptr, \reg1, \abort
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str1w \ptr, \reg2, \abort
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str1w \ptr, \reg3, \abort
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str1w \ptr, \reg4, \abort
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str1w \ptr, \reg5, \abort
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str1w \ptr, \reg6, \abort
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str1w \ptr, \reg7, \abort
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str1w \ptr, \reg8, \abort
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.endm
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.macro str1b ptr reg cond=al abort
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strusr \reg, \ptr, 1, \cond, abort=\abort
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.endm
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.macro enter reg1 reg2
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mov r3, #0
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stmdb sp!, {r0, r2, r3, \reg1, \reg2}
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.endm
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.macro usave reg1 reg2
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UNWIND( .save {r0, r2, r3, \reg1, \reg2} )
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.endm
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.macro exit reg1 reg2
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add sp, sp, #8
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ldmfd sp!, {r0, \reg1, \reg2}
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.endm
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.text
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ENTRY(__copy_to_user_std)
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WEAK(__copy_to_user)
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#include "copy_template.S"
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ENDPROC(__copy_to_user)
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ENDPROC(__copy_to_user_std)
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.pushsection .text.fixup,"ax"
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.align 0
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copy_abort_preamble
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ldmfd sp!, {r1, r2, r3}
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sub r0, r0, r1
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rsb r0, r0, r2
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copy_abort_end
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.popsection
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