Initial import

1 files changed, 135 insertions, 0 deletions

diff --git a/arch/parisc/lib/lusercopy.S b/arch/parisc/lib/lusercopy.S
new file mode 100644
index 000000000..a512f07d4
--- /dev/null
+++ b/arch/parisc/lib/lusercopy.S
@@ -0,0 +1,135 @@
+/*
+ *    User Space Access Routines
+ *
+ *    Copyright (C) 2000-2002 Hewlett-Packard (John Marvin)
+ *    Copyright (C) 2000 Richard Hirst <rhirst with parisc-linux.org>
+ *    Copyright (C) 2001 Matthieu Delahaye <delahaym at esiee.fr>
+ *    Copyright (C) 2003 Randolph Chung <tausq with parisc-linux.org>
+ *
+ *
+ *    This program is free software; you can redistribute it and/or modify
+ *    it under the terms of the GNU General Public License as published by
+ *    the Free Software Foundation; either version 2, or (at your option)
+ *    any later version.
+ *
+ *    This program is distributed in the hope that it will be useful,
+ *    but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *    GNU General Public License for more details.
+ *
+ *    You should have received a copy of the GNU General Public License
+ *    along with this program; if not, write to the Free Software
+ *    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+/*
+ * These routines still have plenty of room for optimization
+ * (word & doubleword load/store, dual issue, store hints, etc.).
+ */
+
+/*
+ * The following routines assume that space register 3 (sr3) contains
+ * the space id associated with the current users address space.
+ */
+
+
+	.text
+	
+#include <asm/assembly.h>
+#include <asm/errno.h>
+#include <linux/linkage.h>
+
+	/*
+	 * get_sr gets the appropriate space value into
+	 * sr1 for kernel/user space access, depending
+	 * on the flag stored in the task structure.
+	 */
+
+	.macro  get_sr
+	mfctl       %cr30,%r1
+	ldw         TI_SEGMENT(%r1),%r22
+	mfsp        %sr3,%r1
+	or,<>       %r22,%r0,%r0
+	copy        %r0,%r1
+	mtsp        %r1,%sr1
+	.endm
+
+	.macro fixup_branch lbl
+	ldil	    L%\lbl, %r1
+	ldo	    R%\lbl(%r1), %r1
+	bv          %r0(%r1)
+	.endm
+
+	/*
+	 * unsigned long lclear_user(void *to, unsigned long n)
+	 *
+	 * Returns 0 for success.
+	 * otherwise, returns number of bytes not transferred.
+	 */
+
+ENTRY(lclear_user)
+	.proc
+	.callinfo NO_CALLS
+	.entry
+	comib,=,n   0,%r25,$lclu_done
+	get_sr
+$lclu_loop:
+	addib,<>    -1,%r25,$lclu_loop
+1:      stbs,ma     %r0,1(%sr1,%r26)
+
+$lclu_done:
+	bv          %r0(%r2)
+	copy        %r25,%r28
+	.exit
+ENDPROC(lclear_user)
+
+	.section .fixup,"ax"
+2:      fixup_branch $lclu_done
+	ldo        1(%r25),%r25
+	.previous
+
+	ASM_EXCEPTIONTABLE_ENTRY(1b,2b)
+
+	.procend
+
+	/*
+	 * long lstrnlen_user(char *s, long n)
+	 *
+	 * Returns 0 if exception before zero byte or reaching N,
+	 *         N+1 if N would be exceeded,
+	 *         else strlen + 1 (i.e. includes zero byte).
+	 */
+
+ENTRY(lstrnlen_user)
+	.proc
+	.callinfo NO_CALLS
+	.entry
+	comib,=     0,%r25,$lslen_nzero
+	copy	    %r26,%r24
+	get_sr
+1:      ldbs,ma     1(%sr1,%r26),%r1
+$lslen_loop:
+	comib,=,n   0,%r1,$lslen_done
+	addib,<>    -1,%r25,$lslen_loop
+2:      ldbs,ma     1(%sr1,%r26),%r1
+$lslen_done:
+	bv          %r0(%r2)
+	sub	    %r26,%r24,%r28
+	.exit
+
+$lslen_nzero:
+	b           $lslen_done
+	ldo         1(%r26),%r26 /* special case for N == 0 */
+ENDPROC(lstrnlen_user)
+
+	.section .fixup,"ax"
+3:      fixup_branch $lslen_done
+	copy        %r24,%r26    /* reset r26 so 0 is returned on fault */
+	.previous
+
+	ASM_EXCEPTIONTABLE_ENTRY(1b,3b)
+	ASM_EXCEPTIONTABLE_ENTRY(2b,3b)
+
+	.procend
+
+	.end