1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
|
// SPDX-License-Identifier: GPL-2.0+
/*
* linux/arch/powerpc/kernel/traps.c
*
* Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
*
* Modified by Cort Dougan (cort@cs.nmt.edu)
* and Paul Mackerras (paulus@cs.anu.edu.au)
*
* (C) Copyright 2000
* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
*/
/*
* This file handles the architecture-dependent parts of hardware exceptions
*/
#include <common.h>
#include <command.h>
#include <asm/processor.h>
/* Returns 0 if exception not found and fixup otherwise. */
extern unsigned long search_exception_table(unsigned long);
/* THIS NEEDS CHANGING to use the board info structure.
*/
#define END_OF_MEM 0x02000000
/*
* Trap & Exception support
*/
static void print_backtrace(unsigned long *sp)
{
int cnt = 0;
unsigned long i;
printf("Call backtrace: ");
while (sp) {
if ((uint)sp > END_OF_MEM)
break;
i = sp[1];
if (cnt++ % 7 == 0)
printf("\n");
printf("%08lX ", i);
if (cnt > 32)
break;
sp = (unsigned long *)*sp;
}
printf("\n");
}
static void show_regs(struct pt_regs *regs)
{
int i;
printf("NIP: %08lX XER: %08lX LR: %08lX REGS: %p TRAP: %04lx DAR: %08lX\n",
regs->nip, regs->xer, regs->link, regs, regs->trap, regs->dar);
printf("MSR: %08lx EE: %01x PR: %01x FP: %01x ME: %01x IR/DR: %01x%01x\n",
regs->msr, regs->msr & MSR_EE ? 1 : 0,
regs->msr & MSR_PR ? 1 : 0, regs->msr & MSR_FP ? 1 : 0,
regs->msr & MSR_ME ? 1 : 0, regs->msr & MSR_IR ? 1 : 0,
regs->msr & MSR_DR ? 1 : 0);
printf("\n");
for (i = 0; i < 32; i++) {
if ((i % 8) == 0)
printf("GPR%02d: ", i);
printf("%08lX ", regs->gpr[i]);
if ((i % 8) == 7)
printf("\n");
}
}
static void _exception(int signr, struct pt_regs *regs)
{
show_regs(regs);
print_backtrace((unsigned long *)regs->gpr[1]);
panic("Exception in kernel pc %lx signal %d", regs->nip, signr);
}
void MachineCheckException(struct pt_regs *regs)
{
unsigned long fixup = search_exception_table(regs->nip);
/* Probing PCI using config cycles cause this exception
* when a device is not present. Catch it and return to
* the PCI exception handler.
*/
if (fixup != 0) {
regs->nip = fixup;
return;
}
printf("Machine check in kernel mode.\n");
printf("Caused by (from msr): ");
printf("regs %p ", regs);
switch (regs->msr & 0x000F0000) {
case (0x80000000 >> 12):
printf("Machine check signal - probably due to mm fault\n"
"with mmu off\n");
break;
case (0x80000000 >> 13):
printf("Transfer error ack signal\n");
break;
case (0x80000000 >> 14):
printf("Data parity signal\n");
break;
case (0x80000000 >> 15):
printf("Address parity signal\n");
break;
default:
printf("Unknown values in msr\n");
}
show_regs(regs);
print_backtrace((unsigned long *)regs->gpr[1]);
panic("machine check");
}
void AlignmentException(struct pt_regs *regs)
{
show_regs(regs);
print_backtrace((unsigned long *)regs->gpr[1]);
panic("Alignment Exception");
}
void ProgramCheckException(struct pt_regs *regs)
{
show_regs(regs);
print_backtrace((unsigned long *)regs->gpr[1]);
panic("Program Check Exception");
}
void SoftEmuException(struct pt_regs *regs)
{
show_regs(regs);
print_backtrace((unsigned long *)regs->gpr[1]);
panic("Software Emulation Exception");
}
void UnknownException(struct pt_regs *regs)
{
printf("Bad trap at PC: %lx, SR: %lx, vector=%lx\n",
regs->nip, regs->msr, regs->trap);
_exception(0, regs);
}
void DebugException(struct pt_regs *regs)
{
printf("Debugger trap at @ %lx\n", regs->nip);
show_regs(regs);
}
|
