63 строки
1.5 KiB
ArmAsm
63 строки
1.5 KiB
ArmAsm
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/*
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* linux/arch/arm26/lib/copypage.S
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*
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* Copyright (C) 1995-1999 Russell King
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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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* ASM optimised string functions
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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/asm_offsets.h>
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.text
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.align 5
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/*
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* ARMv3 optimised copy_user_page
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*
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* FIXME: rmk do we need to handle cache stuff...
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* FIXME: im is this right on ARM26?
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*/
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ENTRY(__copy_user_page)
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stmfd sp!, {r4, lr} @ 2
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mov r2, #PAGE_SZ/64 @ 1
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ldmia r1!, {r3, r4, ip, lr} @ 4+1
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1: stmia r0!, {r3, r4, ip, lr} @ 4
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ldmia r1!, {r3, r4, ip, lr} @ 4+1
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stmia r0!, {r3, r4, ip, lr} @ 4
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ldmia r1!, {r3, r4, ip, lr} @ 4+1
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stmia r0!, {r3, r4, ip, lr} @ 4
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ldmia r1!, {r3, r4, ip, lr} @ 4
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subs r2, r2, #1 @ 1
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stmia r0!, {r3, r4, ip, lr} @ 4
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ldmneia r1!, {r3, r4, ip, lr} @ 4
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bne 1b @ 1
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LOADREGS(fd, sp!, {r4, pc}) @ 3
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.align 5
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/*
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* ARMv3 optimised clear_user_page
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*
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* FIXME: rmk do we need to handle cache stuff...
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*/
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ENTRY(__clear_user_page)
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str lr, [sp, #-4]!
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mov r1, #PAGE_SZ/64 @ 1
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mov r2, #0 @ 1
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mov r3, #0 @ 1
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mov ip, #0 @ 1
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mov lr, #0 @ 1
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1: stmia r0!, {r2, r3, ip, lr} @ 4
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stmia r0!, {r2, r3, ip, lr} @ 4
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stmia r0!, {r2, r3, ip, lr} @ 4
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stmia r0!, {r2, r3, ip, lr} @ 4
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subs r1, r1, #1 @ 1
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bne 1b @ 1
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ldr pc, [sp], #4
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.section ".init.text", #alloc, #execinstr
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