blob: 13894c90502abf3fd41a092544311b9683f4dbc0 [file] [log] [blame]
wdenk983fda82004-10-28 00:09:35 +00001/*
Stefan Roesea47a12b2010-04-15 16:07:28 +02002 * linux/arch/powerpc/kernel/traps.c
wdenk983fda82004-10-28 00:09:35 +00003 *
4 * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
5 *
6 * Modified by Cort Dougan (cort@cs.nmt.edu)
7 * and Paul Mackerras (paulus@cs.anu.edu.au)
8 * fixed Machine Check Reasons by Reinhard Meyer (r.meyer@emk-elektronik.de)
9 *
10 * (C) Copyright 2000-2003
11 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
12 *
13 * See file CREDITS for list of people who contributed to this
14 * project.
15 *
16 * This program is free software; you can redistribute it and/or
17 * modify it under the terms of the GNU General Public License as
18 * published by the Free Software Foundation; either version 2 of
19 * the License, or (at your option) any later version.
20 *
21 * This program is distributed in the hope that it will be useful,
22 * but WITHOUT ANY WARRANTY; without even the implied warranty of
23 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
24 * GNU General Public License for more details.
25 *
26 * You should have received a copy of the GNU General Public License
27 * along with this program; if not, write to the Free Software
28 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
29 * MA 02111-1307 USA
30 */
31
32/*
33 * This file handles the architecture-dependent parts of hardware exceptions
34 */
35
36#include <common.h>
37#include <command.h>
Mike Frysingere39bf1e2010-02-08 15:30:16 -050038#include <kgdb.h>
wdenk983fda82004-10-28 00:09:35 +000039#include <asm/processor.h>
40
wdenk983fda82004-10-28 00:09:35 +000041/* Returns 0 if exception not found and fixup otherwise. */
42extern unsigned long search_exception_table (unsigned long);
43
44/* THIS NEEDS CHANGING to use the board info structure.
45*/
46#define END_OF_MEM 0x02000000
47
48/*
49 * Trap & Exception support
50 */
51
52void print_backtrace (unsigned long *sp)
53{
54 int cnt = 0;
55 unsigned long i;
56
57 printf ("Call backtrace: ");
58 while (sp) {
59 if ((uint) sp > END_OF_MEM)
60 break;
61
62 i = sp[1];
63 if (cnt++ % 7 == 0)
64 printf ("\n");
65 printf ("%08lX ", i);
66 if (cnt > 32)
67 break;
68 sp = (unsigned long *) *sp;
69 }
70 printf ("\n");
71}
72
73void show_regs (struct pt_regs *regs)
74{
75 int i;
76
77 printf ("NIP: %08lX XER: %08lX LR: %08lX REGS: %p TRAP: %04lx DAR: %08lX\n",
78 regs->nip, regs->xer, regs->link, regs, regs->trap, regs->dar);
79 printf ("MSR: %08lx EE: %01x PR: %01x FP: %01x ME: %01x IR/DR: %01x%01x\n",
80 regs->msr,
81 regs->msr & MSR_EE ? 1 : 0, regs->msr & MSR_PR ? 1 : 0,
82 regs->msr & MSR_FP ? 1 : 0, regs->msr & MSR_ME ? 1 : 0,
83 regs->msr & MSR_IR ? 1 : 0, regs->msr & MSR_DR ? 1 : 0);
84
85 printf ("\n");
86 for (i = 0; i < 32; i++) {
87 if ((i % 8) == 0) {
88 printf ("GPR%02d: ", i);
89 }
90
91 printf ("%08lX ", regs->gpr[i]);
92 if ((i % 8) == 7) {
93 printf ("\n");
94 }
95 }
96}
97
98
99void _exception (int signr, struct pt_regs *regs)
100{
101 show_regs (regs);
102 print_backtrace ((unsigned long *) regs->gpr[1]);
103 panic ("Exception in kernel pc %lx signal %d", regs->nip, signr);
104}
105
106void MachineCheckException (struct pt_regs *regs)
107{
108 unsigned long fixup;
109
110 /* Probing PCI using config cycles cause this exception
111 * when a device is not present. Catch it and return to
112 * the PCI exception handler.
113 */
114 if ((fixup = search_exception_table (regs->nip)) != 0) {
115 regs->nip = fixup;
116 return;
117 }
Jon Loeliger44312832007-07-09 19:06:00 -0500118#if defined(CONFIG_CMD_KGDB)
wdenk983fda82004-10-28 00:09:35 +0000119 if (debugger_exception_handler
120 && (*debugger_exception_handler) (regs))
121 return;
122#endif
123
124 printf ("Machine check in kernel mode.\n");
125 printf ("Caused by (from msr): ");
126 printf ("regs %p ", regs);
127 /* refer to 603e Manual (MPC603EUM/AD), chapter 4.5.2.1 */
128 switch (regs->msr & 0x000F0000) {
129 case (0x80000000 >> 12):
130 printf ("Machine check signal - probably due to mm fault\n"
131 "with mmu off\n");
132 break;
133 case (0x80000000 >> 13):
134 printf ("Transfer error ack signal\n");
135 break;
136 case (0x80000000 >> 14):
137 printf ("Data parity signal\n");
138 break;
139 case (0x80000000 >> 15):
140 printf ("Address parity signal\n");
141 break;
142 default:
143 printf ("Unknown values in msr\n");
144 }
145 show_regs (regs);
146 print_backtrace ((unsigned long *) regs->gpr[1]);
147 panic ("machine check");
148}
149
150void AlignmentException (struct pt_regs *regs)
151{
Jon Loeliger44312832007-07-09 19:06:00 -0500152#if defined(CONFIG_CMD_KGDB)
wdenk983fda82004-10-28 00:09:35 +0000153 if (debugger_exception_handler
154 && (*debugger_exception_handler) (regs))
155 return;
156#endif
157 show_regs (regs);
158 print_backtrace ((unsigned long *) regs->gpr[1]);
159 panic ("Alignment Exception");
160}
161
162void ProgramCheckException (struct pt_regs *regs)
163{
Jon Loeliger44312832007-07-09 19:06:00 -0500164#if defined(CONFIG_CMD_KGDB)
wdenk983fda82004-10-28 00:09:35 +0000165 if (debugger_exception_handler
166 && (*debugger_exception_handler) (regs))
167 return;
168#endif
169 show_regs (regs);
170 print_backtrace ((unsigned long *) regs->gpr[1]);
171 panic ("Program Check Exception");
172}
173
174void SoftEmuException (struct pt_regs *regs)
175{
Jon Loeliger44312832007-07-09 19:06:00 -0500176#if defined(CONFIG_CMD_KGDB)
wdenk983fda82004-10-28 00:09:35 +0000177 if (debugger_exception_handler
178 && (*debugger_exception_handler) (regs))
179 return;
180#endif
181 show_regs (regs);
182 print_backtrace ((unsigned long *) regs->gpr[1]);
183 panic ("Software Emulation Exception");
184}
185
186
187void UnknownException (struct pt_regs *regs)
188{
Jon Loeliger44312832007-07-09 19:06:00 -0500189#if defined(CONFIG_CMD_KGDB)
wdenk983fda82004-10-28 00:09:35 +0000190 if (debugger_exception_handler
191 && (*debugger_exception_handler) (regs))
192 return;
193#endif
194 printf ("Bad trap at PC: %lx, SR: %lx, vector=%lx\n",
195 regs->nip, regs->msr, regs->trap);
196 _exception (0, regs);
197}
198
Jon Loeliger44312832007-07-09 19:06:00 -0500199#if defined(CONFIG_CMD_BEDBUG)
wdenk983fda82004-10-28 00:09:35 +0000200extern void do_bedbug_breakpoint (struct pt_regs *);
201#endif
202
203void DebugException (struct pt_regs *regs)
204{
205
206 printf ("Debugger trap at @ %lx\n", regs->nip);
207 show_regs (regs);
Jon Loeliger44312832007-07-09 19:06:00 -0500208#if defined(CONFIG_CMD_BEDBUG)
wdenk983fda82004-10-28 00:09:35 +0000209 do_bedbug_breakpoint (regs);
210#endif
211}
212
213/* Probe an address by reading. If not present, return -1, otherwise
214 * return 0.
215 */
216int addr_probe (uint * addr)
217{
218#if 0
219 int retval;
220
221 __asm__ __volatile__ ("1: lwz %0,0(%1)\n"
222 " eieio\n"
223 " li %0,0\n"
224 "2:\n"
225 ".section .fixup,\"ax\"\n"
226 "3: li %0,-1\n"
227 " b 2b\n"
228 ".section __ex_table,\"a\"\n"
229 " .align 2\n"
230 " .long 1b,3b\n"
231 ".text":"=r" (retval):"r" (addr));
232
233 return (retval);
234#endif
235 return 0;
236}