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affae2bf | 1 | /* |
a47a12be | 2 | * linux/arch/powerpc/kernel/traps.c |
affae2bf WD |
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. */ | |
39 | extern 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 | ||
49 | void | |
50 | print_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 | ||
70 | void 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 | ||
98 | void | |
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 | ||
106 | void | |
107 | MachineCheckException(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); | |
63e73c9a WD |
123 | switch( regs->msr & 0x000F0000) { |
124 | case (0x80000000>>12): | |
affae2bf WD |
125 | printf("Machine check signal - probably due to mm fault\n" |
126 | "with mmu off\n"); | |
127 | break; | |
63e73c9a | 128 | case (0x80000000>>13): |
affae2bf WD |
129 | printf("Transfer error ack signal\n"); |
130 | break; | |
63e73c9a | 131 | case (0x80000000>>14): |
affae2bf WD |
132 | printf("Data parity signal\n"); |
133 | break; | |
63e73c9a | 134 | case (0x80000000>>15): |
affae2bf WD |
135 | printf("Address parity signal\n"); |
136 | break; | |
137 | default: | |
138 | printf("Unknown values in msr\n"); | |
139 | } | |
140 | show_regs(regs); | |
141 | print_backtrace((unsigned long *)regs->gpr[1]); | |
142 | panic("machine check"); | |
143 | } | |
144 | ||
145 | void | |
146 | AlignmentException(struct pt_regs *regs) | |
147 | { | |
148 | show_regs(regs); | |
149 | print_backtrace((unsigned long *)regs->gpr[1]); | |
150 | panic("Alignment Exception"); | |
151 | } | |
152 | ||
153 | void | |
154 | ProgramCheckException(struct pt_regs *regs) | |
155 | { | |
156 | show_regs(regs); | |
157 | print_backtrace((unsigned long *)regs->gpr[1]); | |
158 | panic("Program Check Exception"); | |
159 | } | |
160 | ||
161 | void | |
162 | SoftEmuException(struct pt_regs *regs) | |
163 | { | |
164 | show_regs(regs); | |
165 | print_backtrace((unsigned long *)regs->gpr[1]); | |
166 | panic("Software Emulation Exception"); | |
167 | } | |
168 | ||
169 | ||
170 | void | |
171 | UnknownException(struct pt_regs *regs) | |
172 | { | |
173 | printf("Bad trap at PC: %lx, SR: %lx, vector=%lx\n", | |
174 | regs->nip, regs->msr, regs->trap); | |
175 | _exception(0, regs); | |
176 | } | |
177 | ||
4431283c | 178 | #if defined(CONFIG_CMD_BEDBUG) |
43d9616c WD |
179 | extern void do_bedbug_breakpoint(struct pt_regs *); |
180 | #endif | |
181 | ||
182 | void | |
183 | DebugException(struct pt_regs *regs) | |
184 | { | |
185 | ||
186 | printf("Debugger trap at @ %lx\n", regs->nip ); | |
187 | show_regs(regs); | |
4431283c | 188 | #if defined(CONFIG_CMD_BEDBUG) |
43d9616c WD |
189 | do_bedbug_breakpoint( regs ); |
190 | #endif | |
191 | } | |
192 | ||
affae2bf WD |
193 | /* Probe an address by reading. If not present, return -1, otherwise |
194 | * return 0. | |
195 | */ | |
196 | int | |
197 | addr_probe(uint *addr) | |
198 | { | |
199 | #if 0 | |
200 | int retval; | |
201 | ||
202 | __asm__ __volatile__( \ | |
203 | "1: lwz %0,0(%1)\n" \ | |
204 | " eieio\n" \ | |
205 | " li %0,0\n" \ | |
206 | "2:\n" \ | |
207 | ".section .fixup,\"ax\"\n" \ | |
208 | "3: li %0,-1\n" \ | |
209 | " b 2b\n" \ | |
210 | ".section __ex_table,\"a\"\n" \ | |
211 | " .align 2\n" \ | |
212 | " .long 1b,3b\n" \ | |
213 | ".text" \ | |
214 | : "=r" (retval) : "r"(addr)); | |
215 | ||
216 | return (retval); | |
217 | #endif | |
218 | return 0; | |
219 | } |