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affae2bf WD |
1 | /* |
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 | ||
d87080b7 WD |
39 | #ifdef CONFIG_AMIGAONEG3SE |
40 | DECLARE_GLOBAL_DATA_PTR; | |
41 | #endif | |
42 | ||
3a1ed1e1 | 43 | #if defined(CONFIG_CMD_KGDB) |
affae2bf WD |
44 | int (*debugger_exception_handler)(struct pt_regs *) = 0; |
45 | #endif | |
46 | ||
47 | /* Returns 0 if exception not found and fixup otherwise. */ | |
48 | extern unsigned long search_exception_table(unsigned long); | |
49 | ||
50 | /* THIS NEEDS CHANGING to use the board info structure. | |
51 | */ | |
c7de829c WD |
52 | #ifdef CONFIG_AMIGAONEG3SE |
53 | #define END_OF_MEM (gd->bd->bi_memstart + gd->bd->bi_memsize) | |
54 | #else | |
affae2bf | 55 | #define END_OF_MEM 0x02000000 |
c7de829c | 56 | #endif |
affae2bf WD |
57 | |
58 | /* | |
59 | * Trap & Exception support | |
60 | */ | |
61 | ||
62 | void | |
63 | print_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 | ||
83 | void | |
84 | show_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 | ||
114 | void | |
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 | ||
122 | void | |
123 | MachineCheckException(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 | ||
3a1ed1e1 | 136 | #if defined(CONFIG_CMD_KGDB) |
affae2bf WD |
137 | 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); | |
63e73c9a WD |
144 | switch( regs->msr & 0x000F0000) { |
145 | case (0x80000000>>12): | |
affae2bf WD |
146 | printf("Machine check signal - probably due to mm fault\n" |
147 | "with mmu off\n"); | |
148 | break; | |
63e73c9a | 149 | case (0x80000000>>13): |
affae2bf WD |
150 | printf("Transfer error ack signal\n"); |
151 | break; | |
63e73c9a | 152 | case (0x80000000>>14): |
affae2bf WD |
153 | printf("Data parity signal\n"); |
154 | break; | |
63e73c9a | 155 | case (0x80000000>>15): |
affae2bf WD |
156 | 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 | ||
166 | void | |
167 | AlignmentException(struct pt_regs *regs) | |
168 | { | |
3a1ed1e1 | 169 | #if defined(CONFIG_CMD_KGDB) |
affae2bf WD |
170 | 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 | ||
178 | void | |
179 | ProgramCheckException(struct pt_regs *regs) | |
180 | { | |
c7de829c WD |
181 | unsigned char *p = regs ? (unsigned char *)(regs->nip) : NULL; |
182 | int i, j; | |
183 | ||
3a1ed1e1 | 184 | #if defined(CONFIG_CMD_KGDB) |
affae2bf WD |
185 | if (debugger_exception_handler && (*debugger_exception_handler)(regs)) |
186 | return; | |
187 | #endif | |
188 | show_regs(regs); | |
c7de829c WD |
189 | |
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 | ||
affae2bf WD |
200 | print_backtrace((unsigned long *)regs->gpr[1]); |
201 | panic("Program Check Exception"); | |
202 | } | |
203 | ||
204 | void | |
205 | SoftEmuException(struct pt_regs *regs) | |
206 | { | |
3a1ed1e1 | 207 | #if defined(CONFIG_CMD_KGDB) |
affae2bf WD |
208 | 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 | ||
217 | void | |
218 | UnknownException(struct pt_regs *regs) | |
219 | { | |
3a1ed1e1 | 220 | #if defined(CONFIG_CMD_KGDB) |
affae2bf WD |
221 | 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 | */ | |
232 | int | |
233 | addr_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 | } |