blob: cdee2be78b5757f9626592dd95c0a46cca02636c [file] [log] [blame]
wdenk983fda82004-10-28 00:09:35 +00001/*
2 * linux/arch/ppc/kernel/traps.c
3 *
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>
38#include <asm/processor.h>
39
40#if (CONFIG_COMMANDS & CFG_CMD_KGDB)
41int (*debugger_exception_handler) (struct pt_regs *) = 0;
42#endif
43
44/* Returns 0 if exception not found and fixup otherwise. */
45extern unsigned long search_exception_table (unsigned long);
46
47/* THIS NEEDS CHANGING to use the board info structure.
48*/
49#define END_OF_MEM 0x02000000
50
51/*
52 * Trap & Exception support
53 */
54
55void print_backtrace (unsigned long *sp)
56{
57 int cnt = 0;
58 unsigned long i;
59
60 printf ("Call backtrace: ");
61 while (sp) {
62 if ((uint) sp > END_OF_MEM)
63 break;
64
65 i = sp[1];
66 if (cnt++ % 7 == 0)
67 printf ("\n");
68 printf ("%08lX ", i);
69 if (cnt > 32)
70 break;
71 sp = (unsigned long *) *sp;
72 }
73 printf ("\n");
74}
75
76void show_regs (struct pt_regs *regs)
77{
78 int i;
79
80 printf ("NIP: %08lX XER: %08lX LR: %08lX REGS: %p TRAP: %04lx DAR: %08lX\n",
81 regs->nip, regs->xer, regs->link, regs, regs->trap, regs->dar);
82 printf ("MSR: %08lx EE: %01x PR: %01x FP: %01x ME: %01x IR/DR: %01x%01x\n",
83 regs->msr,
84 regs->msr & MSR_EE ? 1 : 0, regs->msr & MSR_PR ? 1 : 0,
85 regs->msr & MSR_FP ? 1 : 0, regs->msr & MSR_ME ? 1 : 0,
86 regs->msr & MSR_IR ? 1 : 0, regs->msr & MSR_DR ? 1 : 0);
87
88 printf ("\n");
89 for (i = 0; i < 32; i++) {
90 if ((i % 8) == 0) {
91 printf ("GPR%02d: ", i);
92 }
93
94 printf ("%08lX ", regs->gpr[i]);
95 if ((i % 8) == 7) {
96 printf ("\n");
97 }
98 }
99}
100
101
102void _exception (int signr, struct pt_regs *regs)
103{
104 show_regs (regs);
105 print_backtrace ((unsigned long *) regs->gpr[1]);
106 panic ("Exception in kernel pc %lx signal %d", regs->nip, signr);
107}
108
109void MachineCheckException (struct pt_regs *regs)
110{
111 unsigned long fixup;
112
113 /* Probing PCI using config cycles cause this exception
114 * when a device is not present. Catch it and return to
115 * the PCI exception handler.
116 */
117 if ((fixup = search_exception_table (regs->nip)) != 0) {
118 regs->nip = fixup;
119 return;
120 }
121#if (CONFIG_COMMANDS & CFG_CMD_KGDB)
122 if (debugger_exception_handler
123 && (*debugger_exception_handler) (regs))
124 return;
125#endif
126
127 printf ("Machine check in kernel mode.\n");
128 printf ("Caused by (from msr): ");
129 printf ("regs %p ", regs);
130 /* refer to 603e Manual (MPC603EUM/AD), chapter 4.5.2.1 */
131 switch (regs->msr & 0x000F0000) {
132 case (0x80000000 >> 12):
133 printf ("Machine check signal - probably due to mm fault\n"
134 "with mmu off\n");
135 break;
136 case (0x80000000 >> 13):
137 printf ("Transfer error ack signal\n");
138 break;
139 case (0x80000000 >> 14):
140 printf ("Data parity signal\n");
141 break;
142 case (0x80000000 >> 15):
143 printf ("Address parity signal\n");
144 break;
145 default:
146 printf ("Unknown values in msr\n");
147 }
148 show_regs (regs);
149 print_backtrace ((unsigned long *) regs->gpr[1]);
150 panic ("machine check");
151}
152
153void AlignmentException (struct pt_regs *regs)
154{
155#if (CONFIG_COMMANDS & CFG_CMD_KGDB)
156 if (debugger_exception_handler
157 && (*debugger_exception_handler) (regs))
158 return;
159#endif
160 show_regs (regs);
161 print_backtrace ((unsigned long *) regs->gpr[1]);
162 panic ("Alignment Exception");
163}
164
165void ProgramCheckException (struct pt_regs *regs)
166{
167#if (CONFIG_COMMANDS & CFG_CMD_KGDB)
168 if (debugger_exception_handler
169 && (*debugger_exception_handler) (regs))
170 return;
171#endif
172 show_regs (regs);
173 print_backtrace ((unsigned long *) regs->gpr[1]);
174 panic ("Program Check Exception");
175}
176
177void SoftEmuException (struct pt_regs *regs)
178{
179#if (CONFIG_COMMANDS & CFG_CMD_KGDB)
180 if (debugger_exception_handler
181 && (*debugger_exception_handler) (regs))
182 return;
183#endif
184 show_regs (regs);
185 print_backtrace ((unsigned long *) regs->gpr[1]);
186 panic ("Software Emulation Exception");
187}
188
189
190void UnknownException (struct pt_regs *regs)
191{
192#if (CONFIG_COMMANDS & CFG_CMD_KGDB)
193 if (debugger_exception_handler
194 && (*debugger_exception_handler) (regs))
195 return;
196#endif
197 printf ("Bad trap at PC: %lx, SR: %lx, vector=%lx\n",
198 regs->nip, regs->msr, regs->trap);
199 _exception (0, regs);
200}
201
202#if (CONFIG_COMMANDS & CFG_CMD_BEDBUG)
203extern void do_bedbug_breakpoint (struct pt_regs *);
204#endif
205
206void DebugException (struct pt_regs *regs)
207{
208
209 printf ("Debugger trap at @ %lx\n", regs->nip);
210 show_regs (regs);
211#if (CONFIG_COMMANDS & CFG_CMD_BEDBUG)
212 do_bedbug_breakpoint (regs);
213#endif
214}
215
216/* Probe an address by reading. If not present, return -1, otherwise
217 * return 0.
218 */
219int addr_probe (uint * addr)
220{
221#if 0
222 int retval;
223
224 __asm__ __volatile__ ("1: lwz %0,0(%1)\n"
225 " eieio\n"
226 " li %0,0\n"
227 "2:\n"
228 ".section .fixup,\"ax\"\n"
229 "3: li %0,-1\n"
230 " b 2b\n"
231 ".section __ex_table,\"a\"\n"
232 " .align 2\n"
233 " .long 1b,3b\n"
234 ".text":"=r" (retval):"r" (addr));
235
236 return (retval);
237#endif
238 return 0;
239}