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wdenkaffae2b2002-08-17 09:36:01 +00001/*
Stefan Roese88fbf932010-04-15 16:07:28 +02002 * linux/arch/powerpc/kernel/traps.c
wdenkaffae2b2002-08-17 09:36:01 +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 *
9 * (C) Copyright 2000
10 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
11 *
12 * See file CREDITS for list of people who contributed to this
13 * project.
14 *
15 * This program is free software; you can redistribute it and/or
16 * modify it under the terms of the GNU General Public License as
17 * published by the Free Software Foundation; either version 2 of
18 * the License, or (at your option) any later version.
19 *
20 * This program is distributed in the hope that it will be useful,
21 * but WITHOUT ANY WARRANTY; without even the implied warranty of
22 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
23 * GNU General Public License for more details.
24 *
25 * You should have received a copy of the GNU General Public License
26 * along with this program; if not, write to the Free Software
27 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
28 * MA 02111-1307 USA
29 */
30
31/*
32 * This file handles the architecture-dependent parts of hardware exceptions
33 */
34
35#include <common.h>
36#include <command.h>
Mike Frysinger629d88b2010-02-08 15:30:16 -050037#include <kgdb.h>
wdenkaffae2b2002-08-17 09:36:01 +000038#include <asm/processor.h>
39
wdenkaffae2b2002-08-17 09:36:01 +000040/* Returns 0 if exception not found and fixup otherwise. */
41extern unsigned long search_exception_table(unsigned long);
42
43/* THIS NEEDS CHANGING to use the board info structure.
44*/
45#define END_OF_MEM 0x02000000
46
47/*
48 * Trap & Exception support
49 */
50
Kim Phillipse16737f2012-10-29 13:34:29 +000051static void print_backtrace(unsigned long *sp)
wdenkaffae2b2002-08-17 09:36:01 +000052{
53 int cnt = 0;
54 unsigned long i;
55
56 printf("Call backtrace: ");
57 while (sp) {
58 if ((uint)sp > END_OF_MEM)
59 break;
60
61 i = sp[1];
62 if (cnt++ % 7 == 0)
63 printf("\n");
64 printf("%08lX ", i);
65 if (cnt > 32) break;
66 sp = (unsigned long *)*sp;
67 }
68 printf("\n");
69}
70
Kim Phillipse16737f2012-10-29 13:34:29 +000071void show_regs(struct pt_regs *regs)
wdenkaffae2b2002-08-17 09:36:01 +000072{
73 int i;
74
75 printf("NIP: %08lX XER: %08lX LR: %08lX REGS:"
76 " %p TRAP: %04lx DAR: %08lX\n",
77 regs->nip, regs->xer, regs->link, regs, regs->trap, regs->dar);
78 printf("MSR: %08lx EE: %01x PR: %01x FP:"
79 " %01x ME: %01x IR/DR: %01x%01x\n",
80 regs->msr, regs->msr&MSR_EE ? 1 : 0, regs->msr&MSR_PR ? 1 : 0,
81 regs->msr & MSR_FP ? 1 : 0,regs->msr&MSR_ME ? 1 : 0,
82 regs->msr&MSR_IR ? 1 : 0,
83 regs->msr&MSR_DR ? 1 : 0);
84
85 printf("\n");
86 for (i = 0; i < 32; i++) {
87 if ((i % 8) == 0)
88 {
89 printf("GPR%02d: ", i);
90 }
91
92 printf("%08lX ", regs->gpr[i]);
93 if ((i % 8) == 7)
94 {
95 printf("\n");
96 }
97 }
98}
99
100
Kim Phillipse16737f2012-10-29 13:34:29 +0000101static void _exception(int signr, struct pt_regs *regs)
wdenkaffae2b2002-08-17 09:36:01 +0000102{
103 show_regs(regs);
104 print_backtrace((unsigned long *)regs->gpr[1]);
105 panic("Exception in kernel pc %lx signal %d",regs->nip,signr);
106}
107
Kim Phillipse16737f2012-10-29 13:34:29 +0000108void MachineCheckException(struct pt_regs *regs)
wdenkaffae2b2002-08-17 09:36:01 +0000109{
110 unsigned long fixup;
111
112 /* Probing PCI using config cycles cause this exception
113 * when a device is not present. Catch it and return to
114 * the PCI exception handler.
115 */
116 if ((fixup = search_exception_table(regs->nip)) != 0) {
117 regs->nip = fixup;
118 return;
119 }
120
Jon Loeligera5217742007-07-09 18:57:22 -0500121#if defined(CONFIG_CMD_KGDB)
wdenkaffae2b2002-08-17 09:36:01 +0000122 if (debugger_exception_handler && (*debugger_exception_handler)(regs))
123 return;
124#endif
125
126 printf("Machine check in kernel mode.\n");
127 printf("Caused by (from msr): ");
128 printf("regs %p ",regs);
wdenke97d3d92004-02-23 22:22:28 +0000129 switch( regs->msr & 0x000F0000) {
130 case (0x80000000>>12):
wdenkaffae2b2002-08-17 09:36:01 +0000131 printf("Machine check signal - probably due to mm fault\n"
132 "with mmu off\n");
133 break;
wdenke97d3d92004-02-23 22:22:28 +0000134 case (0x80000000>>13):
wdenkaffae2b2002-08-17 09:36:01 +0000135 printf("Transfer error ack signal\n");
136 break;
wdenke97d3d92004-02-23 22:22:28 +0000137 case (0x80000000>>14):
wdenkaffae2b2002-08-17 09:36:01 +0000138 printf("Data parity signal\n");
139 break;
wdenke97d3d92004-02-23 22:22:28 +0000140 case (0x80000000>>15):
wdenkaffae2b2002-08-17 09:36:01 +0000141 printf("Address parity signal\n");
142 break;
143 default:
144 printf("Unknown values in msr\n");
145 }
146 show_regs(regs);
147 print_backtrace((unsigned long *)regs->gpr[1]);
148 panic("machine check");
149}
150
Kim Phillipse16737f2012-10-29 13:34:29 +0000151void AlignmentException(struct pt_regs *regs)
wdenkaffae2b2002-08-17 09:36:01 +0000152{
Jon Loeligera5217742007-07-09 18:57:22 -0500153#if defined(CONFIG_CMD_KGDB)
wdenkaffae2b2002-08-17 09:36:01 +0000154 if (debugger_exception_handler && (*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
Kim Phillipse16737f2012-10-29 13:34:29 +0000162void ProgramCheckException(struct pt_regs *regs)
wdenkaffae2b2002-08-17 09:36:01 +0000163{
wdenk452cfd62002-11-19 11:04:11 +0000164 unsigned char *p = regs ? (unsigned char *)(regs->nip) : NULL;
165 int i, j;
166
Jon Loeligera5217742007-07-09 18:57:22 -0500167#if defined(CONFIG_CMD_KGDB)
wdenkaffae2b2002-08-17 09:36:01 +0000168 if (debugger_exception_handler && (*debugger_exception_handler)(regs))
169 return;
170#endif
171 show_regs(regs);
wdenk452cfd62002-11-19 11:04:11 +0000172
173 p = (unsigned char *) ((unsigned long)p & 0xFFFFFFE0);
174 p -= 32;
175 for (i = 0; i < 256; i+=16) {
176 printf("%08x: ", (unsigned int)p+i);
177 for (j = 0; j < 16; j++) {
178 printf("%02x ", p[i+j]);
179 }
180 printf("\n");
181 }
182
wdenkaffae2b2002-08-17 09:36:01 +0000183 print_backtrace((unsigned long *)regs->gpr[1]);
184 panic("Program Check Exception");
185}
186
Kim Phillipse16737f2012-10-29 13:34:29 +0000187void SoftEmuException(struct pt_regs *regs)
wdenkaffae2b2002-08-17 09:36:01 +0000188{
Jon Loeligera5217742007-07-09 18:57:22 -0500189#if defined(CONFIG_CMD_KGDB)
wdenkaffae2b2002-08-17 09:36:01 +0000190 if (debugger_exception_handler && (*debugger_exception_handler)(regs))
191 return;
192#endif
193 show_regs(regs);
194 print_backtrace((unsigned long *)regs->gpr[1]);
195 panic("Software Emulation Exception");
196}
197
Kim Phillipse16737f2012-10-29 13:34:29 +0000198void UnknownException(struct pt_regs *regs)
wdenkaffae2b2002-08-17 09:36:01 +0000199{
Jon Loeligera5217742007-07-09 18:57:22 -0500200#if defined(CONFIG_CMD_KGDB)
wdenkaffae2b2002-08-17 09:36:01 +0000201 if (debugger_exception_handler && (*debugger_exception_handler)(regs))
202 return;
203#endif
204 printf("Bad trap at PC: %lx, SR: %lx, vector=%lx\n",
205 regs->nip, regs->msr, regs->trap);
206 _exception(0, regs);
207}
208
209/* Probe an address by reading. If not present, return -1, otherwise
210 * return 0.
211 */
Kim Phillipse16737f2012-10-29 13:34:29 +0000212int addr_probe(uint *addr)
wdenkaffae2b2002-08-17 09:36:01 +0000213{
214#if 0
215 int retval;
216
217 __asm__ __volatile__( \
218 "1: lwz %0,0(%1)\n" \
219 " eieio\n" \
220 " li %0,0\n" \
221 "2:\n" \
222 ".section .fixup,\"ax\"\n" \
223 "3: li %0,-1\n" \
224 " b 2b\n" \
225 ".section __ex_table,\"a\"\n" \
226 " .align 2\n" \
227 " .long 1b,3b\n" \
228 ".text" \
229 : "=r" (retval) : "r"(addr));
230
231 return (retval);
232#endif
233 return 0;
234}