sparc: Add full proper error handling to strncpy_from_user().

Linus removed the end-of-address-space hackery from
fs/namei.c:do_getname() so we really have to validate these edge
conditions and cannot cheat any more (as x86 used to as well).

Move to a common C implementation like x86 did.  And if both
src and dst are sufficiently aligned we'll do word at a time
copies and checks as well.

Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 0 insertions, 133 deletions

diff --git a/arch/sparc/lib/strncpy_from_user_64.S b/arch/sparc/lib/strncpy_from_user_64.S
deleted file mode 100644
index d1246b713077..000000000000
--- a/arch/sparc/lib/strncpy_from_user_64.S
+++ /dev/null
@@ -1,133 +0,0 @@
-/*
- * strncpy_from_user.S: Sparc64 strncpy from userspace.
- *
- *  Copyright (C) 1997, 1999 Jakub Jelinek (jj@ultra.linux.cz)
- */
-
-#include <linux/linkage.h>
-#include <asm/asi.h>
-#include <asm/errno.h>
-
-	.data
-	.align	8
-0:	.xword	0x0101010101010101
-
-	.text
-
-	/* Must return:
-	 *
-	 * -EFAULT		for an exception
-	 * count		if we hit the buffer limit
-	 * bytes copied		if we hit a null byte
-	 * (without the null byte)
-	 *
-	 * This implementation assumes:
-	 * %o1 is 8 aligned => !(%o2 & 7)
-	 * %o0 is 8 aligned (if not, it will be slooooow, but will work)
-	 *
-	 * This is optimized for the common case:
-	 * in my stats, 90% of src are 8 aligned (even on sparc32)
-	 * and average length is 18 or so.
-	 */
-
-ENTRY(__strncpy_from_user)
-	/* %o0=dest, %o1=src, %o2=count */
-	andcc	%o1, 7, %g0		! IEU1	Group
-	bne,pn	%icc, 30f		! CTI
-	 add	%o0, %o2, %g3		! IEU0
-60:	ldxa	[%o1] %asi, %g1		! Load	Group
-	brlez,pn %o2, 10f		! CTI
-	 mov	%o0, %o3		! IEU0
-50:	sethi	%hi(0b), %o4		! IEU0	Group
-	ldx	[%o4 + %lo(0b)], %o4	! Load
-	sllx	%o4, 7, %o5		! IEU1	Group
-1:	sub	%g1, %o4, %g2		! IEU0	Group
-	stx	%g1, [%o0]		! Store
-	add	%o0, 8, %o0		! IEU1
-	andcc	%g2, %o5, %g0		! IEU1	Group
-	bne,pn	%xcc, 5f		! CTI
-	 add	%o1, 8, %o1		! IEU0
-	cmp	%o0, %g3		! IEU1	Group
-	bl,a,pt %xcc, 1b		! CTI
-61:	 ldxa	[%o1] %asi, %g1		! Load
-10:	retl				! CTI	Group
-	 mov	%o2, %o0		! IEU0
-5:	srlx	%g2, 32, %g7		! IEU0	Group
-	sethi	%hi(0xff00), %o4	! IEU1
-	andcc	%g7, %o5, %g0		! IEU1	Group
-	be,pn	%icc, 2f		! CTI
-	 or	%o4, %lo(0xff00), %o4	! IEU0
-	srlx	%g1, 48, %g7		! IEU0	Group
-	andcc	%g7, %o4, %g0		! IEU1	Group
-	be,pn	%icc, 50f		! CTI
-	 andcc	%g7, 0xff, %g0		! IEU1	Group
-	be,pn	%icc, 51f		! CTI
-	 srlx	%g1, 32, %g7		! IEU0
-	andcc	%g7, %o4, %g0		! IEU1	Group
-	be,pn	%icc, 52f		! CTI
-	 andcc	%g7, 0xff, %g0		! IEU1	Group
-	be,pn	%icc, 53f		! CTI
-2:	 andcc	%g2, %o5, %g0		! IEU1	Group
-	be,pn	%icc, 2f		! CTI
-	 srl	%g1, 16, %g7		! IEU0
-	andcc	%g7, %o4, %g0		! IEU1	Group
-	be,pn	%icc, 54f		! CTI
-	 andcc	%g7, 0xff, %g0		! IEU1	Group
-	be,pn	%icc, 55f		! CTI
-	 andcc	%g1, %o4, %g0		! IEU1	Group
-	be,pn	%icc, 56f		! CTI
-	 andcc	%g1, 0xff, %g0		! IEU1	Group
-	be,a,pn	%icc, 57f		! CTI
-	 sub	%o0, %o3, %o0		! IEU0
-2:	cmp	%o0, %g3		! IEU1	Group
-	bl,a,pt	%xcc, 50b		! CTI
-62:	 ldxa	[%o1] %asi, %g1		! Load
-	retl				! CTI	Group
-	 mov	%o2, %o0		! IEU0
-50:	sub	%o0, %o3, %o0
-	retl
-	 sub	%o0, 8, %o0
-51:	sub	%o0, %o3, %o0
-	retl
-	 sub	%o0, 7, %o0
-52:	sub	%o0, %o3, %o0
-	retl
-	 sub	%o0, 6, %o0
-53:	sub	%o0, %o3, %o0
-	retl
-	 sub	%o0, 5, %o0
-54:	sub	%o0, %o3, %o0
-	retl
-	 sub	%o0, 4, %o0
-55:	sub	%o0, %o3, %o0
-	retl
-	 sub	%o0, 3, %o0
-56:	sub	%o0, %o3, %o0
-	retl
-	 sub	%o0, 2, %o0
-57:	retl
-	 sub	%o0, 1, %o0
-30:	brlez,pn %o2, 3f
-	 sub	%g0, %o2, %o3
-	add	%o0, %o2, %o0
-63:	lduba	[%o1] %asi, %o4
-1:	add	%o1, 1, %o1
-	brz,pn	%o4, 2f
-	 stb	%o4, [%o0 + %o3]
-	addcc	%o3, 1, %o3
-	bne,pt	%xcc, 1b
-64:	 lduba	[%o1] %asi, %o4
-3:	retl
-	 mov	%o2, %o0
-2:	retl
-	 add	%o2, %o3, %o0
-ENDPROC(__strncpy_from_user)
-
-	.section __ex_table,"a"
-	.align	4
-	.word	60b, __retl_efault
-	.word	61b, __retl_efault
-	.word	62b, __retl_efault
-	.word	63b, __retl_efault
-	.word	64b, __retl_efault
-	.previous