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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 <asm/processor.h>
37
38/* Returns 0 if exception not found and fixup otherwise. */
39extern unsigned long search_exception_table(unsigned long);
40
41/* THIS NEEDS CHANGING to use the board info structure.
42*/
43#define END_OF_MEM 0x00400000
44
45/*
46 * Trap & Exception support
47 */
48
49void
50print_backtrace(unsigned long *sp)
51{
52 int cnt = 0;
53 unsigned long i;
54
55 printf("Call backtrace: ");
56 while (sp) {
57 if ((uint)sp > END_OF_MEM)
58 break;
59
60 i = sp[1];
61 if (cnt++ % 7 == 0)
62 printf("\n");
63 printf("%08lX ", i);
64 if (cnt > 32) break;
65 sp = (unsigned long *)*sp;
66 }
67 printf("\n");
68}
69
70void show_regs(struct pt_regs * regs)
71{
72 int i;
73
74 printf("NIP: %08lX XER: %08lX LR: %08lX REGS: %p TRAP: %04lx DAR: %08lX\n",
75 regs->nip, regs->xer, regs->link, regs, regs->trap, regs->dar);
76 printf("MSR: %08lx EE: %01x PR: %01x FP: %01x ME: %01x IR/DR: %01x%01x\n",
77 regs->msr, regs->msr&MSR_EE ? 1 : 0, regs->msr&MSR_PR ? 1 : 0,
78 regs->msr & MSR_FP ? 1 : 0,regs->msr&MSR_ME ? 1 : 0,
79 regs->msr&MSR_IR ? 1 : 0,
80 regs->msr&MSR_DR ? 1 : 0);
81
82 printf("\n");
83 for (i = 0; i < 32; i++) {
84 if ((i % 8) == 0)
85 {
86 printf("GPR%02d: ", i);
87 }
88
89 printf("%08lX ", regs->gpr[i]);
90 if ((i % 8) == 7)
91 {
92 printf("\n");
93 }
94 }
95}
96
97
98void
99_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
107MachineCheckException(struct pt_regs *regs)
108{
109 unsigned long fixup;
110
111 /* Probing PCI using config cycles cause this exception
112 * when a device is not present. Catch it and return to
113 * the PCI exception handler.
114 */
115 if ((fixup = search_exception_table(regs->nip)) != 0) {
116 regs->nip = fixup;
117 return;
118 }
119
120 printf("Machine check in kernel mode.\n");
121 printf("Caused by (from msr): ");
122 printf("regs %p ",regs);
123 switch( regs->msr & 0x0000F000)
124 {
125 case (1<<12) :
126 printf("Machine check signal - probably due to mm fault\n"
127 "with mmu off\n");
128 break;
129 case (1<<13) :
130 printf("Transfer error ack signal\n");
131 break;
132 case (1<<14) :
133 printf("Data parity signal\n");
134 break;
135 case (1<<15) :
136 printf("Address parity signal\n");
137 break;
138 default:
139 printf("Unknown values in msr\n");
140 }
141 show_regs(regs);
142 print_backtrace((unsigned long *)regs->gpr[1]);
143 panic("machine check");
144}
145
146void
147AlignmentException(struct pt_regs *regs)
148{
149 show_regs(regs);
150 print_backtrace((unsigned long *)regs->gpr[1]);
151 panic("Alignment Exception");
152}
153
154void
155ProgramCheckException(struct pt_regs *regs)
156{
157 show_regs(regs);
158 print_backtrace((unsigned long *)regs->gpr[1]);
159 panic("Program Check Exception");
160}
161
162void
163SoftEmuException(struct pt_regs *regs)
164{
165 show_regs(regs);
166 print_backtrace((unsigned long *)regs->gpr[1]);
167 panic("Software Emulation Exception");
168}
169
170
171void
172UnknownException(struct pt_regs *regs)
173{
174 printf("Bad trap at PC: %lx, SR: %lx, vector=%lx\n",
175 regs->nip, regs->msr, regs->trap);
176 _exception(0, regs);
177}
178
wdenk43d96162003-03-06 00:02:04 +0000179#if (CONFIG_COMMANDS & CFG_CMD_BEDBUG)
180extern void do_bedbug_breakpoint(struct pt_regs *);
181#endif
182
183void
184DebugException(struct pt_regs *regs)
185{
186
187 printf("Debugger trap at @ %lx\n", regs->nip );
188 show_regs(regs);
189#if (CONFIG_COMMANDS & CFG_CMD_BEDBUG)
190 do_bedbug_breakpoint( regs );
191#endif
192}
193
wdenkaffae2b2002-08-17 09:36:01 +0000194/* Probe an address by reading. If not present, return -1, otherwise
195 * return 0.
196 */
197int
198addr_probe(uint *addr)
199{
200#if 0
201 int retval;
202
203 __asm__ __volatile__( \
204 "1: lwz %0,0(%1)\n" \
205 " eieio\n" \
206 " li %0,0\n" \
207 "2:\n" \
208 ".section .fixup,\"ax\"\n" \
209 "3: li %0,-1\n" \
210 " b 2b\n" \
211 ".section __ex_table,\"a\"\n" \
212 " .align 2\n" \
213 " .long 1b,3b\n" \
214 ".text" \
215 : "=r" (retval) : "r"(addr));
216
217 return (retval);
218#endif
219 return 0;
220}