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
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
|
/*
* (C) Copyright 2000 - 2007
* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
*
* Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
*
* SPDX-License-Identifier: GPL-2.0+
*
* Derived from the MPC83xx code.
*/
/*
* This file handles the architecture-dependent parts of hardware
* exceptions
*/
#include <common.h>
#include <kgdb.h>
#include <asm/processor.h>
DECLARE_GLOBAL_DATA_PTR;
extern unsigned long search_exception_table(unsigned long);
/*
* End of addressable memory. This may be less than the actual
* amount of memory on the system if we're unable to keep all
* the memory mapped in.
*/
#define END_OF_MEM (gd->bd->bi_memstart + get_effective_memsize())
/*
* Trap & Exception support
*/
static void print_backtrace(unsigned long *sp)
{
int cnt = 0;
unsigned long i;
puts("Call backtrace: ");
while (sp) {
if ((uint)sp > END_OF_MEM)
break;
i = sp[1];
if (cnt++ % 7 == 0)
putc('\n');
printf("%08lX ", i);
if (cnt > 32) break;
sp = (unsigned long *) *sp;
}
putc('\n');
}
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);
putc('\n');
for (i = 0; i < 32; i++) {
if ((i % 8) == 0) {
printf("GPR%02d: ", i);
}
printf("%08lX ", regs->gpr[i]);
if ((i % 8) == 7) {
putc('\n');
}
}
}
static void _exception(int signr, struct pt_regs *regs)
{
show_regs(regs);
print_backtrace((unsigned long *)regs->gpr[1]);
panic("Exception at pc %lx signal %d", regs->nip, signr);
}
void MachineCheckException(struct pt_regs *regs)
{
unsigned long fixup = search_exception_table(regs->nip);
if (fixup) {
regs->nip = fixup;
return;
}
#ifdef CONFIG_CMD_KGDB
if (debugger_exception_handler && (*debugger_exception_handler)(regs))
return;
#endif
puts("Machine check.\nCaused by (from msr): ");
printf("regs %p ", regs);
switch (regs->msr & 0x00FF0000) {
case (0x80000000 >> 10):
puts("Instruction cache parity signal\n");
break;
case (0x80000000 >> 11):
puts("Data cache parity signal\n");
break;
case (0x80000000 >> 12):
puts("Machine check signal\n");
break;
case (0x80000000 >> 13):
puts("Transfer error ack signal\n");
break;
case (0x80000000 >> 14):
puts("Data parity signal\n");
break;
case (0x80000000 >> 15):
puts("Address parity signal\n");
break;
default:
puts("Unknown values in msr\n");
}
show_regs(regs);
print_backtrace((unsigned long *)regs->gpr[1]);
panic("machine check");
}
void AlignmentException(struct pt_regs *regs)
{
#ifdef CONFIG_CMD_KGDB
if (debugger_exception_handler && (*debugger_exception_handler)(regs))
return;
#endif
show_regs(regs);
print_backtrace((unsigned long *)regs->gpr[1]);
panic("Alignment Exception");
}
void ProgramCheckException(struct pt_regs *regs)
{
#ifdef CONFIG_CMD_KGDB
if (debugger_exception_handler && (*debugger_exception_handler)(regs))
return;
#endif
show_regs(regs);
print_backtrace((unsigned long *)regs->gpr[1]);
panic("Program Check Exception");
}
void SoftEmuException(struct pt_regs *regs)
{
#ifdef CONFIG_CMD_KGDB
if (debugger_exception_handler && (*debugger_exception_handler)(regs))
return;
#endif
show_regs(regs);
print_backtrace((unsigned long *)regs->gpr[1]);
panic("Software Emulation Exception");
}
void UnknownException(struct pt_regs *regs)
{
#ifdef CONFIG_CMD_KGDB
if (debugger_exception_handler && (*debugger_exception_handler)(regs))
return;
#endif
printf("Bad trap at PC: %lx, SR: %lx, vector=%lx\n",
regs->nip, regs->msr, regs->trap);
_exception(0, regs);
}
#ifdef CONFIG_CMD_BEDBUG
extern void do_bedbug_breakpoint(struct pt_regs *);
#endif
void DebugException(struct pt_regs *regs)
{
printf("Debugger trap at @ %lx\n", regs->nip);
show_regs(regs);
#ifdef CONFIG_CMD_BEDBUG
do_bedbug_breakpoint(regs);
#endif
}
|
