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19#include <common.h>
20#include <command.h>
21#include <kgdb.h>
22#include <asm/processor.h>
23
24#if defined(CONFIG_CMD_BEDBUG)
25extern void do_bedbug_breakpoint(struct pt_regs *);
26#endif
27
28
29extern unsigned long search_exception_table(unsigned long);
30
31
32
33#define END_OF_MEM 0x02000000
34
35
36
37
38
39static void print_backtrace(unsigned long *sp)
40{
41 int cnt = 0;
42 unsigned long i;
43
44 printf("Call backtrace: ");
45 while (sp) {
46 if ((uint)sp > END_OF_MEM)
47 break;
48
49 i = sp[1];
50 if (cnt++ % 7 == 0)
51 printf("\n");
52 printf("%08lX ", i);
53 if (cnt > 32) break;
54 sp = (unsigned long *)*sp;
55 }
56 printf("\n");
57}
58
59void show_regs(struct pt_regs *regs)
60{
61 int i;
62
63 printf("NIP: %08lX XER: %08lX LR: %08lX REGS: %p TRAP: %04lx DAR: %08lX\n",
64 regs->nip, regs->xer, regs->link, regs, regs->trap, regs->dar);
65 printf("MSR: %08lx EE: %01x PR: %01x FP: %01x ME: %01x IR/DR: %01x%01x\n",
66 regs->msr, regs->msr&MSR_EE ? 1 : 0, regs->msr&MSR_PR ? 1 : 0,
67 regs->msr & MSR_FP ? 1 : 0,regs->msr&MSR_ME ? 1 : 0,
68 regs->msr&MSR_IR ? 1 : 0,
69 regs->msr&MSR_DR ? 1 : 0);
70
71 printf("\n");
72 for (i = 0; i < 32; i++) {
73 if ((i % 8) == 0)
74 {
75 printf("GPR%02d: ", i);
76 }
77
78 printf("%08lX ", regs->gpr[i]);
79 if ((i % 8) == 7)
80 {
81 printf("\n");
82 }
83 }
84}
85
86
87static void _exception(int signr, struct pt_regs *regs)
88{
89 show_regs(regs);
90 print_backtrace((unsigned long *)regs->gpr[1]);
91 panic("Exception in kernel pc %lx signal %d",regs->nip,signr);
92}
93
94void MachineCheckException(struct pt_regs *regs)
95{
96 unsigned long fixup;
97
98
99
100
101
102 if ((fixup = search_exception_table(regs->nip)) != 0) {
103 regs->nip = fixup;
104 return;
105 }
106
107#if defined(CONFIG_CMD_KGDB)
108 if (debugger_exception_handler && (*debugger_exception_handler)(regs))
109 return;
110#endif
111
112 printf("Machine check in kernel mode.\n");
113 printf("Caused by (from msr): ");
114 printf("regs %p ",regs);
115 switch( regs->msr & 0x000F0000) {
116 case (0x80000000>>12):
117 printf("Machine check signal - probably due to mm fault\n"
118 "with mmu off\n");
119 break;
120 case (0x80000000>>13):
121 printf("Transfer error ack signal\n");
122 break;
123 case (0x80000000>>14):
124 printf("Data parity signal\n");
125 break;
126 case (0x80000000>>15):
127 printf("Address parity signal\n");
128 break;
129 default:
130 printf("Unknown values in msr\n");
131 }
132 show_regs(regs);
133 print_backtrace((unsigned long *)regs->gpr[1]);
134 panic("machine check");
135}
136
137void AlignmentException(struct pt_regs *regs)
138{
139#if defined(CONFIG_CMD_KGDB)
140 if (debugger_exception_handler && (*debugger_exception_handler)(regs))
141 return;
142#endif
143 show_regs(regs);
144 print_backtrace((unsigned long *)regs->gpr[1]);
145 panic("Alignment Exception");
146}
147
148void ProgramCheckException(struct pt_regs *regs)
149{
150#if defined(CONFIG_CMD_KGDB)
151 if (debugger_exception_handler && (*debugger_exception_handler)(regs))
152 return;
153#endif
154 show_regs(regs);
155 print_backtrace((unsigned long *)regs->gpr[1]);
156 panic("Program Check Exception");
157}
158
159void SoftEmuException(struct pt_regs *regs)
160{
161#if defined(CONFIG_CMD_KGDB)
162 if (debugger_exception_handler && (*debugger_exception_handler)(regs))
163 return;
164#endif
165 show_regs(regs);
166 print_backtrace((unsigned long *)regs->gpr[1]);
167 panic("Software Emulation Exception");
168}
169
170
171void UnknownException(struct pt_regs *regs)
172{
173#if defined(CONFIG_CMD_KGDB)
174 if (debugger_exception_handler && (*debugger_exception_handler)(regs))
175 return;
176#endif
177 printf("Bad trap at PC: %lx, SR: %lx, vector=%lx\n",
178 regs->nip, regs->msr, regs->trap);
179 _exception(0, regs);
180}
181
182void DebugException(struct pt_regs *regs)
183{
184 printf("Debugger trap at @ %lx\n", regs->nip );
185 show_regs(regs);
186#if defined(CONFIG_CMD_BEDBUG)
187 do_bedbug_breakpoint( regs );
188#endif
189}
190
191
192
193
194int addr_probe(uint *addr)
195{
196#if 0
197 int retval;
198
199 __asm__ __volatile__( \
200 "1: lwz %0,0(%1)\n" \
201 " eieio\n" \
202 " li %0,0\n" \
203 "2:\n" \
204 ".section .fixup,\"ax\"\n" \
205 "3: li %0,-1\n" \
206 " b 2b\n" \
207 ".section __ex_table,\"a\"\n" \
208 " .align 2\n" \
209 " .long 1b,3b\n" \
210 ".text" \
211 : "=r" (retval) : "r"(addr));
212
213 return (retval);
214#endif
215 return 0;
216}
217