From a0c6fdb987860e6c7f9b8e57439ca2703f462578 Mon Sep 17 00:00:00 2001 From: Nicolas Pitre Date: Tue, 1 Nov 2005 19:52:22 +0000 Subject: [ARM] 2946/2: split --arch_clear_user() out of lib/uaccess.S Patch from Nicolas Pitre Required for future enhancement patches. Signed-off-by: Nicolas Pitre Signed-off-by: Russell King --- arch/arm/lib/Makefile | 5 +++-- arch/arm/lib/clear_user.S | 52 +++++++++++++++++++++++++++++++++++++++++++++++ arch/arm/lib/uaccess.S | 38 ---------------------------------- 3 files changed, 55 insertions(+), 40 deletions(-) create mode 100644 arch/arm/lib/clear_user.S (limited to 'arch') diff --git a/arch/arm/lib/Makefile b/arch/arm/lib/Makefile index 71e5b99e519e..d3d9b21eb7e4 100644 --- a/arch/arm/lib/Makefile +++ b/arch/arm/lib/Makefile @@ -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 diff --git a/arch/arm/lib/clear_user.S b/arch/arm/lib/clear_user.S new file mode 100644 index 000000000000..7ff9f831b3f9 --- /dev/null +++ b/arch/arm/lib/clear_user.S @@ -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 +#include + + .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 + diff --git a/arch/arm/lib/uaccess.S b/arch/arm/lib/uaccess.S index d3ed0636c008..c28449157bea 100644 --- a/arch/arm/lib/uaccess.S +++ b/arch/arm/lib/uaccess.S @@ -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 - -- cgit v1.2.3