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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 <asm/processor.h> | |
21 | ||
22 | /* Returns 0 if exception not found and fixup otherwise. */ | |
23 | extern unsigned long search_exception_table(unsigned long); | |
24 | ||
25 | /* THIS NEEDS CHANGING to use the board info structure. | |
26 | */ | |
27 | #define END_OF_MEM 0x00400000 | |
28 | ||
29 | /* | |
30 | * Trap & Exception support | |
31 | */ | |
32 | ||
20051f2a | 33 | static void print_backtrace(unsigned long *sp) |
affae2bf WD |
34 | { |
35 | int cnt = 0; | |
36 | unsigned long i; | |
37 | ||
38 | printf("Call backtrace: "); | |
39 | while (sp) { | |
40 | if ((uint)sp > END_OF_MEM) | |
41 | break; | |
42 | ||
43 | i = sp[1]; | |
44 | if (cnt++ % 7 == 0) | |
45 | printf("\n"); | |
46 | printf("%08lX ", i); | |
47 | if (cnt > 32) break; | |
48 | sp = (unsigned long *)*sp; | |
49 | } | |
50 | printf("\n"); | |
51 | } | |
52 | ||
20051f2a | 53 | void show_regs(struct pt_regs *regs) |
affae2bf WD |
54 | { |
55 | int i; | |
56 | ||
57 | printf("NIP: %08lX XER: %08lX LR: %08lX REGS: %p TRAP: %04lx DAR: %08lX\n", | |
58 | regs->nip, regs->xer, regs->link, regs, regs->trap, regs->dar); | |
59 | printf("MSR: %08lx EE: %01x PR: %01x FP: %01x ME: %01x IR/DR: %01x%01x\n", | |
60 | regs->msr, regs->msr&MSR_EE ? 1 : 0, regs->msr&MSR_PR ? 1 : 0, | |
61 | regs->msr & MSR_FP ? 1 : 0,regs->msr&MSR_ME ? 1 : 0, | |
62 | regs->msr&MSR_IR ? 1 : 0, | |
63 | regs->msr&MSR_DR ? 1 : 0); | |
64 | ||
65 | printf("\n"); | |
66 | for (i = 0; i < 32; i++) { | |
67 | if ((i % 8) == 0) | |
68 | { | |
69 | printf("GPR%02d: ", i); | |
70 | } | |
71 | ||
72 | printf("%08lX ", regs->gpr[i]); | |
73 | if ((i % 8) == 7) | |
74 | { | |
75 | printf("\n"); | |
76 | } | |
77 | } | |
78 | } | |
79 | ||
80 | ||
20051f2a | 81 | static void _exception(int signr, struct pt_regs *regs) |
affae2bf WD |
82 | { |
83 | show_regs(regs); | |
84 | print_backtrace((unsigned long *)regs->gpr[1]); | |
85 | panic("Exception in kernel pc %lx signal %d",regs->nip,signr); | |
86 | } | |
87 | ||
20051f2a | 88 | void MachineCheckException(struct pt_regs *regs) |
affae2bf WD |
89 | { |
90 | unsigned long fixup; | |
91 | ||
92 | /* Probing PCI using config cycles cause this exception | |
93 | * when a device is not present. Catch it and return to | |
94 | * the PCI exception handler. | |
95 | */ | |
96 | if ((fixup = search_exception_table(regs->nip)) != 0) { | |
97 | regs->nip = fixup; | |
98 | return; | |
99 | } | |
100 | ||
101 | printf("Machine check in kernel mode.\n"); | |
102 | printf("Caused by (from msr): "); | |
103 | printf("regs %p ",regs); | |
63e73c9a WD |
104 | switch( regs->msr & 0x000F0000) { |
105 | case (0x80000000>>12): | |
affae2bf WD |
106 | printf("Machine check signal - probably due to mm fault\n" |
107 | "with mmu off\n"); | |
108 | break; | |
63e73c9a | 109 | case (0x80000000>>13): |
affae2bf WD |
110 | printf("Transfer error ack signal\n"); |
111 | break; | |
63e73c9a | 112 | case (0x80000000>>14): |
affae2bf WD |
113 | printf("Data parity signal\n"); |
114 | break; | |
63e73c9a | 115 | case (0x80000000>>15): |
affae2bf WD |
116 | printf("Address parity signal\n"); |
117 | break; | |
118 | default: | |
119 | printf("Unknown values in msr\n"); | |
120 | } | |
121 | show_regs(regs); | |
122 | print_backtrace((unsigned long *)regs->gpr[1]); | |
123 | panic("machine check"); | |
124 | } | |
125 | ||
20051f2a | 126 | void AlignmentException(struct pt_regs *regs) |
affae2bf WD |
127 | { |
128 | show_regs(regs); | |
129 | print_backtrace((unsigned long *)regs->gpr[1]); | |
130 | panic("Alignment Exception"); | |
131 | } | |
132 | ||
20051f2a | 133 | void ProgramCheckException(struct pt_regs *regs) |
affae2bf WD |
134 | { |
135 | show_regs(regs); | |
136 | print_backtrace((unsigned long *)regs->gpr[1]); | |
137 | panic("Program Check Exception"); | |
138 | } | |
139 | ||
20051f2a | 140 | void SoftEmuException(struct pt_regs *regs) |
affae2bf WD |
141 | { |
142 | show_regs(regs); | |
143 | print_backtrace((unsigned long *)regs->gpr[1]); | |
144 | panic("Software Emulation Exception"); | |
145 | } | |
146 | ||
147 | ||
20051f2a | 148 | void UnknownException(struct pt_regs *regs) |
affae2bf WD |
149 | { |
150 | printf("Bad trap at PC: %lx, SR: %lx, vector=%lx\n", | |
151 | regs->nip, regs->msr, regs->trap); | |
152 | _exception(0, regs); | |
153 | } | |
154 | ||
4431283c | 155 | #if defined(CONFIG_CMD_BEDBUG) |
43d9616c WD |
156 | extern void do_bedbug_breakpoint(struct pt_regs *); |
157 | #endif | |
158 | ||
20051f2a | 159 | void DebugException(struct pt_regs *regs) |
43d9616c WD |
160 | { |
161 | ||
162 | printf("Debugger trap at @ %lx\n", regs->nip ); | |
163 | show_regs(regs); | |
4431283c | 164 | #if defined(CONFIG_CMD_BEDBUG) |
43d9616c WD |
165 | do_bedbug_breakpoint( regs ); |
166 | #endif | |
167 | } | |
168 | ||
affae2bf WD |
169 | /* Probe an address by reading. If not present, return -1, otherwise |
170 | * return 0. | |
171 | */ | |
20051f2a | 172 | int addr_probe(uint *addr) |
affae2bf WD |
173 | { |
174 | #if 0 | |
175 | int retval; | |
176 | ||
177 | __asm__ __volatile__( \ | |
178 | "1: lwz %0,0(%1)\n" \ | |
179 | " eieio\n" \ | |
180 | " li %0,0\n" \ | |
181 | "2:\n" \ | |
182 | ".section .fixup,\"ax\"\n" \ | |
183 | "3: li %0,-1\n" \ | |
184 | " b 2b\n" \ | |
185 | ".section __ex_table,\"a\"\n" \ | |
186 | " .align 2\n" \ | |
187 | " .long 1b,3b\n" \ | |
188 | ".text" \ | |
189 | : "=r" (retval) : "r"(addr)); | |
190 | ||
191 | return (retval); | |
192 | #endif | |
193 | return 0; | |
194 | } |