[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 <nico@cam.org> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
git-mirror · Nov 1, 2005 · a0c6fdb · a0c6fdb
1 parent 85eb226
commit a0c6fdb
Show file tree

Hide file tree

Showing 3 changed files with 55 additions and 40 deletions.
diff --git 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
@@ -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
+
diff --git 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
-