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Commit | Line | Data |
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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 | * | |
1a459660 | 12 | * SPDX-License-Identifier: GPL-2.0+ |
affae2bf WD |
13 | */ |
14 | ||
15 | /* | |
16 | * This file handles the architecture-dependent parts of hardware exceptions | |
17 | */ | |
18 | ||
19 | #include <common.h> | |
20 | #include <command.h> | |
e39bf1e2 | 21 | #include <kgdb.h> |
affae2bf WD |
22 | #include <asm/processor.h> |
23 | ||
affae2bf WD |
24 | /* Returns 0 if exception not found and fixup otherwise. */ |
25 | extern unsigned long search_exception_table(unsigned long); | |
26 | ||
27 | /* THIS NEEDS CHANGING to use the board info structure. | |
28 | */ | |
29 | #define END_OF_MEM 0x02000000 | |
30 | ||
31 | /* | |
32 | * Trap & Exception support | |
33 | */ | |
34 | ||
20051f2a | 35 | static void print_backtrace(unsigned long *sp) |
affae2bf WD |
36 | { |
37 | int cnt = 0; | |
38 | unsigned long i; | |
39 | ||
40 | printf("Call backtrace: "); | |
41 | while (sp) { | |
42 | if ((uint)sp > END_OF_MEM) | |
43 | break; | |
44 | ||
45 | i = sp[1]; | |
46 | if (cnt++ % 7 == 0) | |
47 | printf("\n"); | |
48 | printf("%08lX ", i); | |
49 | if (cnt > 32) break; | |
50 | sp = (unsigned long *)*sp; | |
51 | } | |
52 | printf("\n"); | |
53 | } | |
54 | ||
20051f2a | 55 | void show_regs(struct pt_regs *regs) |
affae2bf WD |
56 | { |
57 | int i; | |
58 | ||
59 | printf("NIP: %08lX XER: %08lX LR: %08lX REGS:" | |
60 | " %p TRAP: %04lx DAR: %08lX\n", | |
61 | regs->nip, regs->xer, regs->link, regs, regs->trap, regs->dar); | |
62 | printf("MSR: %08lx EE: %01x PR: %01x FP:" | |
63 | " %01x ME: %01x IR/DR: %01x%01x\n", | |
64 | regs->msr, regs->msr&MSR_EE ? 1 : 0, regs->msr&MSR_PR ? 1 : 0, | |
65 | regs->msr & MSR_FP ? 1 : 0,regs->msr&MSR_ME ? 1 : 0, | |
66 | regs->msr&MSR_IR ? 1 : 0, | |
67 | regs->msr&MSR_DR ? 1 : 0); | |
68 | ||
69 | printf("\n"); | |
70 | for (i = 0; i < 32; i++) { | |
71 | if ((i % 8) == 0) | |
72 | { | |
73 | printf("GPR%02d: ", i); | |
74 | } | |
75 | ||
76 | printf("%08lX ", regs->gpr[i]); | |
77 | if ((i % 8) == 7) | |
78 | { | |
79 | printf("\n"); | |
80 | } | |
81 | } | |
82 | } | |
83 | ||
84 | ||
20051f2a | 85 | static void _exception(int signr, struct pt_regs *regs) |
affae2bf WD |
86 | { |
87 | show_regs(regs); | |
88 | print_backtrace((unsigned long *)regs->gpr[1]); | |
89 | panic("Exception in kernel pc %lx signal %d",regs->nip,signr); | |
90 | } | |
91 | ||
20051f2a | 92 | void MachineCheckException(struct pt_regs *regs) |
affae2bf WD |
93 | { |
94 | unsigned long fixup; | |
95 | ||
96 | /* Probing PCI using config cycles cause this exception | |
97 | * when a device is not present. Catch it and return to | |
98 | * the PCI exception handler. | |
99 | */ | |
100 | if ((fixup = search_exception_table(regs->nip)) != 0) { | |
101 | regs->nip = fixup; | |
102 | return; | |
103 | } | |
104 | ||
3a1ed1e1 | 105 | #if defined(CONFIG_CMD_KGDB) |
affae2bf WD |
106 | if (debugger_exception_handler && (*debugger_exception_handler)(regs)) |
107 | return; | |
108 | #endif | |
109 | ||
110 | printf("Machine check in kernel mode.\n"); | |
111 | printf("Caused by (from msr): "); | |
112 | printf("regs %p ",regs); | |
63e73c9a WD |
113 | switch( regs->msr & 0x000F0000) { |
114 | case (0x80000000>>12): | |
affae2bf WD |
115 | printf("Machine check signal - probably due to mm fault\n" |
116 | "with mmu off\n"); | |
117 | break; | |
63e73c9a | 118 | case (0x80000000>>13): |
affae2bf WD |
119 | printf("Transfer error ack signal\n"); |
120 | break; | |
63e73c9a | 121 | case (0x80000000>>14): |
affae2bf WD |
122 | printf("Data parity signal\n"); |
123 | break; | |
63e73c9a | 124 | case (0x80000000>>15): |
affae2bf WD |
125 | printf("Address parity signal\n"); |
126 | break; | |
127 | default: | |
128 | printf("Unknown values in msr\n"); | |
129 | } | |
130 | show_regs(regs); | |
131 | print_backtrace((unsigned long *)regs->gpr[1]); | |
132 | panic("machine check"); | |
133 | } | |
134 | ||
20051f2a | 135 | void AlignmentException(struct pt_regs *regs) |
affae2bf | 136 | { |
3a1ed1e1 | 137 | #if defined(CONFIG_CMD_KGDB) |
affae2bf WD |
138 | if (debugger_exception_handler && (*debugger_exception_handler)(regs)) |
139 | return; | |
140 | #endif | |
141 | show_regs(regs); | |
142 | print_backtrace((unsigned long *)regs->gpr[1]); | |
143 | panic("Alignment Exception"); | |
144 | } | |
145 | ||
20051f2a | 146 | void ProgramCheckException(struct pt_regs *regs) |
affae2bf | 147 | { |
c7de829c WD |
148 | unsigned char *p = regs ? (unsigned char *)(regs->nip) : NULL; |
149 | int i, j; | |
150 | ||
3a1ed1e1 | 151 | #if defined(CONFIG_CMD_KGDB) |
affae2bf WD |
152 | if (debugger_exception_handler && (*debugger_exception_handler)(regs)) |
153 | return; | |
154 | #endif | |
155 | show_regs(regs); | |
c7de829c WD |
156 | |
157 | p = (unsigned char *) ((unsigned long)p & 0xFFFFFFE0); | |
158 | p -= 32; | |
159 | for (i = 0; i < 256; i+=16) { | |
160 | printf("%08x: ", (unsigned int)p+i); | |
161 | for (j = 0; j < 16; j++) { | |
162 | printf("%02x ", p[i+j]); | |
163 | } | |
164 | printf("\n"); | |
165 | } | |
166 | ||
affae2bf WD |
167 | print_backtrace((unsigned long *)regs->gpr[1]); |
168 | panic("Program Check Exception"); | |
169 | } | |
170 | ||
20051f2a | 171 | void SoftEmuException(struct pt_regs *regs) |
affae2bf | 172 | { |
3a1ed1e1 | 173 | #if defined(CONFIG_CMD_KGDB) |
affae2bf WD |
174 | if (debugger_exception_handler && (*debugger_exception_handler)(regs)) |
175 | return; | |
176 | #endif | |
177 | show_regs(regs); | |
178 | print_backtrace((unsigned long *)regs->gpr[1]); | |
179 | panic("Software Emulation Exception"); | |
180 | } | |
181 | ||
20051f2a | 182 | void UnknownException(struct pt_regs *regs) |
affae2bf | 183 | { |
3a1ed1e1 | 184 | #if defined(CONFIG_CMD_KGDB) |
affae2bf WD |
185 | if (debugger_exception_handler && (*debugger_exception_handler)(regs)) |
186 | return; | |
187 | #endif | |
188 | printf("Bad trap at PC: %lx, SR: %lx, vector=%lx\n", | |
189 | regs->nip, regs->msr, regs->trap); | |
190 | _exception(0, regs); | |
191 | } | |
192 | ||
193 | /* Probe an address by reading. If not present, return -1, otherwise | |
194 | * return 0. | |
195 | */ | |
20051f2a | 196 | int addr_probe(uint *addr) |
affae2bf WD |
197 | { |
198 | #if 0 | |
199 | int retval; | |
200 | ||
201 | __asm__ __volatile__( \ | |
202 | "1: lwz %0,0(%1)\n" \ | |
203 | " eieio\n" \ | |
204 | " li %0,0\n" \ | |
205 | "2:\n" \ | |
206 | ".section .fixup,\"ax\"\n" \ | |
207 | "3: li %0,-1\n" \ | |
208 | " b 2b\n" \ | |
209 | ".section __ex_table,\"a\"\n" \ | |
210 | " .align 2\n" \ | |
211 | " .long 1b,3b\n" \ | |
212 | ".text" \ | |
213 | : "=r" (retval) : "r"(addr)); | |
214 | ||
215 | return (retval); | |
216 | #endif | |
217 | return 0; | |
218 | } |