1 files changed, 92 insertions, 0 deletions
diff --git a/arch/parisc/lib/fixup.S b/arch/parisc/lib/fixup.S
new file mode 100644
index 000000000..536ef66bb
--- /dev/null
+++ b/arch/parisc/lib/fixup.S
@@ -0,0 +1,92 @@
+/*
+ * Linux/PA-RISC Project (http://www.parisc-linux.org/)
+ *
+ *  Copyright (C) 2004  Randolph Chung <tausq@debian.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., 675 Mass Ave, Cambridge, MA 02139, USA.
+ * 
+ * Fixup routines for kernel exception handling.
+ */
+#include <asm/asm-offsets.h>
+#include <asm/assembly.h>
+#include <asm/errno.h>
+#include <linux/linkage.h>
+
+#ifdef CONFIG_SMP
+	.macro  get_fault_ip t1 t2
+	addil LT%__per_cpu_offset,%r27
+	LDREG RT%__per_cpu_offset(%r1),\t1
+	/* t2 = smp_processor_id() */
+	mfctl 30,\t2
+	ldw TI_CPU(\t2),\t2
+#ifdef CONFIG_64BIT
+	extrd,u \t2,63,32,\t2
+#endif
+	/* t2 = &__per_cpu_offset[smp_processor_id()]; */
+	LDREGX \t2(\t1),\t2 
+	addil LT%exception_data,%r27
+	LDREG RT%exception_data(%r1),\t1
+	/* t1 = this_cpu_ptr(&exception_data) */
+	add,l \t1,\t2,\t1
+	/* t1 = t1->fault_ip */
+	LDREG EXCDATA_IP(\t1), \t1
+	.endm
+#else
+	.macro  get_fault_ip t1 t2
+	/* t1 = this_cpu_ptr(&exception_data) */
+	addil LT%exception_data,%r27
+	LDREG RT%exception_data(%r1),\t2
+	/* t1 = t2->fault_ip */
+	LDREG EXCDATA_IP(\t2), \t1
+	.endm
+#endif
+
+	.level LEVEL
+
+	.text
+	.section .fixup, "ax"
+
+	/* get_user() fixups, store -EFAULT in r8, and 0 in r9 */
+ENTRY(fixup_get_user_skip_1)
+	get_fault_ip %r1,%r8
+	ldo 4(%r1), %r1
+	ldi -EFAULT, %r8
+	bv %r0(%r1)
+	copy %r0, %r9
+ENDPROC(fixup_get_user_skip_1)
+
+ENTRY(fixup_get_user_skip_2)
+	get_fault_ip %r1,%r8
+	ldo 8(%r1), %r1
+	ldi -EFAULT, %r8
+	bv %r0(%r1)
+	copy %r0, %r9
+ENDPROC(fixup_get_user_skip_2)
+
+	/* put_user() fixups, store -EFAULT in r8 */
+ENTRY(fixup_put_user_skip_1)
+	get_fault_ip %r1,%r8
+	ldo 4(%r1), %r1
+	bv %r0(%r1)
+	ldi -EFAULT, %r8
+ENDPROC(fixup_put_user_skip_1)
+
+ENTRY(fixup_put_user_skip_2)
+	get_fault_ip %r1,%r8
+	ldo 8(%r1), %r1
+	bv %r0(%r1)
+	ldi -EFAULT, %r8
+ENDPROC(fixup_put_user_skip_2)
+