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wdenkaffae2b2002-08-17 09:36:01 +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 *
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>
37#include <asm/processor.h>
38
Wolfgang Denkd87080b2006-03-31 18:32:53 +020039#ifdef CONFIG_AMIGAONEG3SE
40DECLARE_GLOBAL_DATA_PTR;
41#endif
42
Jon Loeliger3a1ed1e2007-07-09 18:57:22 -050043#if defined(CONFIG_CMD_KGDB)
wdenkaffae2b2002-08-17 09:36:01 +000044int (*debugger_exception_handler)(struct pt_regs *) = 0;
45#endif
46
47/* Returns 0 if exception not found and fixup otherwise. */
48extern unsigned long search_exception_table(unsigned long);
49
50/* THIS NEEDS CHANGING to use the board info structure.
51*/
wdenkc7de8292002-11-19 11:04:11 +000052#ifdef CONFIG_AMIGAONEG3SE
53#define END_OF_MEM (gd->bd->bi_memstart + gd->bd->bi_memsize)
54#else
wdenkaffae2b2002-08-17 09:36:01 +000055#define END_OF_MEM 0x02000000
wdenkc7de8292002-11-19 11:04:11 +000056#endif
wdenkaffae2b2002-08-17 09:36:01 +000057
58/*
59 * Trap & Exception support
60 */
61
62void
63print_backtrace(unsigned long *sp)
64{
65 int cnt = 0;
66 unsigned long i;
67
68 printf("Call backtrace: ");
69 while (sp) {
70 if ((uint)sp > END_OF_MEM)
71 break;
72
73 i = sp[1];
74 if (cnt++ % 7 == 0)
75 printf("\n");
76 printf("%08lX ", i);
77 if (cnt > 32) break;
78 sp = (unsigned long *)*sp;
79 }
80 printf("\n");
81}
82
83void
84show_regs(struct pt_regs * regs)
85{
86 int i;
87
88 printf("NIP: %08lX XER: %08lX LR: %08lX REGS:"
89 " %p TRAP: %04lx DAR: %08lX\n",
90 regs->nip, regs->xer, regs->link, regs, regs->trap, regs->dar);
91 printf("MSR: %08lx EE: %01x PR: %01x FP:"
92 " %01x ME: %01x IR/DR: %01x%01x\n",
93 regs->msr, regs->msr&MSR_EE ? 1 : 0, regs->msr&MSR_PR ? 1 : 0,
94 regs->msr & MSR_FP ? 1 : 0,regs->msr&MSR_ME ? 1 : 0,
95 regs->msr&MSR_IR ? 1 : 0,
96 regs->msr&MSR_DR ? 1 : 0);
97
98 printf("\n");
99 for (i = 0; i < 32; i++) {
100 if ((i % 8) == 0)
101 {
102 printf("GPR%02d: ", i);
103 }
104
105 printf("%08lX ", regs->gpr[i]);
106 if ((i % 8) == 7)
107 {
108 printf("\n");
109 }
110 }
111}
112
113
114void
115_exception(int signr, struct pt_regs *regs)
116{
117 show_regs(regs);
118 print_backtrace((unsigned long *)regs->gpr[1]);
119 panic("Exception in kernel pc %lx signal %d",regs->nip,signr);
120}
121
122void
123MachineCheckException(struct pt_regs *regs)
124{
125 unsigned long fixup;
126
127 /* Probing PCI using config cycles cause this exception
128 * when a device is not present. Catch it and return to
129 * the PCI exception handler.
130 */
131 if ((fixup = search_exception_table(regs->nip)) != 0) {
132 regs->nip = fixup;
133 return;
134 }
135
Jon Loeliger3a1ed1e2007-07-09 18:57:22 -0500136#if defined(CONFIG_CMD_KGDB)
wdenkaffae2b2002-08-17 09:36:01 +0000137 if (debugger_exception_handler && (*debugger_exception_handler)(regs))
138 return;
139#endif
140
141 printf("Machine check in kernel mode.\n");
142 printf("Caused by (from msr): ");
143 printf("regs %p ",regs);
wdenk63e73c92004-02-23 22:22:28 +0000144 switch( regs->msr & 0x000F0000) {
145 case (0x80000000>>12):
wdenkaffae2b2002-08-17 09:36:01 +0000146 printf("Machine check signal - probably due to mm fault\n"
147 "with mmu off\n");
148 break;
wdenk63e73c92004-02-23 22:22:28 +0000149 case (0x80000000>>13):
wdenkaffae2b2002-08-17 09:36:01 +0000150 printf("Transfer error ack signal\n");
151 break;
wdenk63e73c92004-02-23 22:22:28 +0000152 case (0x80000000>>14):
wdenkaffae2b2002-08-17 09:36:01 +0000153 printf("Data parity signal\n");
154 break;
wdenk63e73c92004-02-23 22:22:28 +0000155 case (0x80000000>>15):
wdenkaffae2b2002-08-17 09:36:01 +0000156 printf("Address parity signal\n");
157 break;
158 default:
159 printf("Unknown values in msr\n");
160 }
161 show_regs(regs);
162 print_backtrace((unsigned long *)regs->gpr[1]);
163 panic("machine check");
164}
165
166void
167AlignmentException(struct pt_regs *regs)
168{
Jon Loeliger3a1ed1e2007-07-09 18:57:22 -0500169#if defined(CONFIG_CMD_KGDB)
wdenkaffae2b2002-08-17 09:36:01 +0000170 if (debugger_exception_handler && (*debugger_exception_handler)(regs))
171 return;
172#endif
173 show_regs(regs);
174 print_backtrace((unsigned long *)regs->gpr[1]);
175 panic("Alignment Exception");
176}
177
178void
179ProgramCheckException(struct pt_regs *regs)
180{
wdenkc7de8292002-11-19 11:04:11 +0000181 unsigned char *p = regs ? (unsigned char *)(regs->nip) : NULL;
182 int i, j;
183
Jon Loeliger3a1ed1e2007-07-09 18:57:22 -0500184#if defined(CONFIG_CMD_KGDB)
wdenkaffae2b2002-08-17 09:36:01 +0000185 if (debugger_exception_handler && (*debugger_exception_handler)(regs))
186 return;
187#endif
188 show_regs(regs);
wdenkc7de8292002-11-19 11:04:11 +0000189
190 p = (unsigned char *) ((unsigned long)p & 0xFFFFFFE0);
191 p -= 32;
192 for (i = 0; i < 256; i+=16) {
193 printf("%08x: ", (unsigned int)p+i);
194 for (j = 0; j < 16; j++) {
195 printf("%02x ", p[i+j]);
196 }
197 printf("\n");
198 }
199
wdenkaffae2b2002-08-17 09:36:01 +0000200 print_backtrace((unsigned long *)regs->gpr[1]);
201 panic("Program Check Exception");
202}
203
204void
205SoftEmuException(struct pt_regs *regs)
206{
Jon Loeliger3a1ed1e2007-07-09 18:57:22 -0500207#if defined(CONFIG_CMD_KGDB)
wdenkaffae2b2002-08-17 09:36:01 +0000208 if (debugger_exception_handler && (*debugger_exception_handler)(regs))
209 return;
210#endif
211 show_regs(regs);
212 print_backtrace((unsigned long *)regs->gpr[1]);
213 panic("Software Emulation Exception");
214}
215
216
217void
218UnknownException(struct pt_regs *regs)
219{
Jon Loeliger3a1ed1e2007-07-09 18:57:22 -0500220#if defined(CONFIG_CMD_KGDB)
wdenkaffae2b2002-08-17 09:36:01 +0000221 if (debugger_exception_handler && (*debugger_exception_handler)(regs))
222 return;
223#endif
224 printf("Bad trap at PC: %lx, SR: %lx, vector=%lx\n",
225 regs->nip, regs->msr, regs->trap);
226 _exception(0, regs);
227}
228
229/* Probe an address by reading. If not present, return -1, otherwise
230 * return 0.
231 */
232int
233addr_probe(uint *addr)
234{
235#if 0
236 int retval;
237
238 __asm__ __volatile__( \
239 "1: lwz %0,0(%1)\n" \
240 " eieio\n" \
241 " li %0,0\n" \
242 "2:\n" \
243 ".section .fixup,\"ax\"\n" \
244 "3: li %0,-1\n" \
245 " b 2b\n" \
246 ".section __ex_table,\"a\"\n" \
247 " .align 2\n" \
248 " .long 1b,3b\n" \
249 ".text" \
250 : "=r" (retval) : "r"(addr));
251
252 return (retval);
253#endif
254 return 0;
255}