| /* |
| * 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 |
| loadgp |
| 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 |
| /* %r27 = t1->fault_gp - restore gp */ |
| LDREG EXCDATA_GP(\t1), %r27 |
| /* t1 = t1->fault_ip */ |
| LDREG EXCDATA_IP(\t1), \t1 |
| .endm |
| #else |
| .macro get_fault_ip t1 t2 |
| loadgp |
| /* t1 = this_cpu_ptr(&exception_data) */ |
| addil LT%exception_data,%r27 |
| LDREG RT%exception_data(%r1),\t2 |
| /* %r27 = t2->fault_gp - restore gp */ |
| LDREG EXCDATA_GP(\t2), %r27 |
| /* 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) |
| |
