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awilliam
GitHub Repository: awilliam/linux-vfio
 Path: blob/master/arch/parisc/lib/fixup.S
10817 views
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/*

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 * Linux/PA-RISC Project (http://www.parisc-linux.org/)

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 *

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 *  Copyright (C) 2004  Randolph Chung <[email protected]>

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 *

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 *    This program is free software; you can redistribute it and/or modify

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 *    it under the terms of the GNU General Public License as published by

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 *    the Free Software Foundation; either version 2, or (at your option)

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 *    any later version.

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 *

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 *    This program is distributed in the hope that it will be useful,

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 *    but WITHOUT ANY WARRANTY; without even the implied warranty of

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 *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

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 *    GNU General Public License for more details.

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 *

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 *    You should have received a copy of the GNU General Public License

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 *    along with this program; if not, write to the Free Software

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 *    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

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 * 

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 * Fixup routines for kernel exception handling.

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 */

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#include <asm/asm-offsets.h>

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#include <asm/assembly.h>

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#include <asm/errno.h>

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#include <linux/linkage.h>

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#ifdef CONFIG_SMP

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	.macro  get_fault_ip t1 t2

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	addil LT%__per_cpu_offset,%r27

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	LDREG RT%__per_cpu_offset(%r1),\t1

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	/* t2 = smp_processor_id() */

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	mfctl 30,\t2

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	ldw TI_CPU(\t2),\t2

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#ifdef CONFIG_64BIT

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	extrd,u \t2,63,32,\t2

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#endif

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	/* t2 = &__per_cpu_offset[smp_processor_id()]; */

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	LDREGX \t2(\t1),\t2 

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	addil LT%exception_data,%r27

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	LDREG RT%exception_data(%r1),\t1

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	/* t1 = &__get_cpu_var(exception_data) */

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	add,l \t1,\t2,\t1

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	/* t1 = t1->fault_ip */

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	LDREG EXCDATA_IP(\t1), \t1

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	.endm

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#else

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	.macro  get_fault_ip t1 t2

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	/* t1 = &__get_cpu_var(exception_data) */

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	addil LT%exception_data,%r27

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	LDREG RT%exception_data(%r1),\t2

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	/* t1 = t2->fault_ip */

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	LDREG EXCDATA_IP(\t2), \t1

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	.endm

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#endif

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	.level LEVEL

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	.text

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	.section .fixup, "ax"

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	/* get_user() fixups, store -EFAULT in r8, and 0 in r9 */

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ENTRY(fixup_get_user_skip_1)

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	get_fault_ip %r1,%r8

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	ldo 4(%r1), %r1

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	ldi -EFAULT, %r8

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	bv %r0(%r1)

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	copy %r0, %r9

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ENDPROC(fixup_get_user_skip_1)

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ENTRY(fixup_get_user_skip_2)

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	get_fault_ip %r1,%r8

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	ldo 8(%r1), %r1

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	ldi -EFAULT, %r8

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	bv %r0(%r1)

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	copy %r0, %r9

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ENDPROC(fixup_get_user_skip_2)

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	/* put_user() fixups, store -EFAULT in r8 */

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ENTRY(fixup_put_user_skip_1)

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	get_fault_ip %r1,%r8

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	ldo 4(%r1), %r1

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	bv %r0(%r1)

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	ldi -EFAULT, %r8

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ENDPROC(fixup_put_user_skip_1)

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ENTRY(fixup_put_user_skip_2)

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	get_fault_ip %r1,%r8

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	ldo 8(%r1), %r1

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	bv %r0(%r1)

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	ldi -EFAULT, %r8

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ENDPROC(fixup_put_user_skip_2)

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