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[ARM] 2946/2: split --arch_clear_user() out of lib/uaccess.S

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Patch from Nicolas Pitre

Required for future enhancement patches.

Signed-off-by: Nicolas Pitre <nico@cam.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Nicolas Pitre 2005-11-01 19:52:22 +00:00 committed by Russell King
parent 85eb226c44
commit a0c6fdb987
3 changed files with 55 additions and 40 deletions
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5
arch/arm/lib/Makefile
View File

@ -9,8 +9,9 @@ lib-y := backtrace.o changebit.o csumipv6.o csumpartial.o \
copy_page.o delay.o findbit.o memchr.o memcpy.o \
memset.o memzero.o setbit.o strncpy_from_user.o \
strnlen_user.o strchr.o strrchr.o testchangebit.o \
testclearbit.o testsetbit.o uaccess.o getuser.o \
putuser.o ashldi3.o ashrdi3.o lshrdi3.o muldi3.o \
testclearbit.o testsetbit.o uaccess.o \
getuser.o putuser.o clear_user.o \
ashldi3.o ashrdi3.o lshrdi3.o muldi3.o \
ucmpdi2.o lib1funcs.o div64.o sha1.o \
io-readsb.o io-writesb.o io-readsl.o io-writesl.o

52
arch/arm/lib/clear_user.S Normal file
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@ -0,0 +1,52 @@
/*
* linux/arch/arm/lib/clear_user.S
*
* Copyright (C) 1995, 1996,1997,1998 Russell King
*
* 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>
.text
/* Prototype: int __arch_clear_user(void *addr, size_t sz)
* Purpose : clear some user memory
* Params : addr - user memory address to clear
* : sz - number of bytes to clear
* Returns : number of bytes NOT cleared
*/
ENTRY(__arch_clear_user)
stmfd sp!, {r1, lr}
mov r2, #0
cmp r1, #4
blt 2f
ands ip, r0, #3
beq 1f
cmp ip, #2
USER( strbt r2, [r0], #1)
USER( strlebt r2, [r0], #1)
USER( strltbt r2, [r0], #1)
rsb ip, ip, #4
sub r1, r1, ip @ 7 6 5 4 3 2 1
1: subs r1, r1, #8 @ -1 -2 -3 -4 -5 -6 -7
USER( strplt r2, [r0], #4)
USER( strplt r2, [r0], #4)
bpl 1b
adds r1, r1, #4 @ 3 2 1 0 -1 -2 -3
USER( strplt r2, [r0], #4)
2: tst r1, #2 @ 1x 1x 0x 0x 1x 1x 0x
USER( strnebt r2, [r0], #1)
USER( strnebt r2, [r0], #1)
tst r1, #1 @ x1 x0 x1 x0 x1 x0 x1
USER( strnebt r2, [r0], #1)
mov r0, #0
LOADREGS(fd,sp!, {r1, pc})
.section .fixup,"ax"
.align 0
9001: LOADREGS(fd,sp!, {r0, pc})
.previous

38
arch/arm/lib/uaccess.S
View File

@ -657,41 +657,3 @@ USER( ldrgtbt r3, [r1], #1) @ May fault
LOADREGS(fd,sp!, {r4 - r7, pc})
.previous
/* Prototype: int __arch_clear_user(void *addr, size_t sz)
* Purpose : clear some user memory
* Params : addr - user memory address to clear
* : sz - number of bytes to clear
* Returns : number of bytes NOT cleared
*/
ENTRY(__arch_clear_user)
stmfd sp!, {r1, lr}
mov r2, #0
cmp r1, #4
blt 2f
ands ip, r0, #3
beq 1f
cmp ip, #2
USER( strbt r2, [r0], #1)
USER( strlebt r2, [r0], #1)
USER( strltbt r2, [r0], #1)
rsb ip, ip, #4
sub r1, r1, ip @ 7 6 5 4 3 2 1
1: subs r1, r1, #8 @ -1 -2 -3 -4 -5 -6 -7
USER( strplt r2, [r0], #4)
USER( strplt r2, [r0], #4)
bpl 1b
adds r1, r1, #4 @ 3 2 1 0 -1 -2 -3
USER( strplt r2, [r0], #4)
2: tst r1, #2 @ 1x 1x 0x 0x 1x 1x 0x
USER( strnebt r2, [r0], #1)
USER( strnebt r2, [r0], #1)
tst r1, #1 @ x1 x0 x1 x0 x1 x0 x1
USER( strnebt r2, [r0], #1)
mov r0, #0
LOADREGS(fd,sp!, {r1, pc})
.section .fixup,"ax"
.align 0
9001: LOADREGS(fd,sp!, {r0, pc})
.previous