2 * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
4 * Modified by Cort Dougan (cort@cs.nmt.edu)
5 * and Paul Mackerras (paulus@cs.anu.edu.au)
8 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
10 * See file CREDITS for list of people who contributed to this
13 * This program is free software; you can redistribute it and/or
14 * modify it under the terms of the GNU General Public License as
15 * published by the Free Software Foundation; either version 2 of
16 * the License, or (at your option) any later version.
18 * This program is distributed in the hope that it will be useful,
19 * but WITHOUT ANY WARRANTY; without even the implied warranty of
20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
21 * GNU General Public License for more details.
23 * You should have received a copy of the GNU General Public License
24 * along with this program; if not, write to the Free Software
25 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
30 * This file handles the architecture-dependent parts of hardware exceptions
36 #include <asm/processor.h>
38 DECLARE_GLOBAL_DATA_PTR
;
40 /* Returns 0 if exception not found and fixup otherwise. */
41 extern unsigned long search_exception_table(unsigned long);
44 * End of addressable memory. This may be less than the actual
45 * amount of memory on the system if we're unable to keep all
46 * the memory mapped in.
48 extern ulong
get_effective_memsize(void);
49 #define END_OF_MEM (gd->bd->bi_memstart + get_effective_memsize())
52 * Trap & Exception support
56 print_backtrace(unsigned long *sp
)
61 printf("Call backtrace: ");
63 if ((uint
) sp
> END_OF_MEM
)
72 sp
= (unsigned long *)*sp
;
78 show_regs(struct pt_regs
*regs
)
82 printf("NIP: %08lX XER: %08lX LR: %08lX REGS:"
83 " %p TRAP: %04lx DAR: %08lX\n",
84 regs
->nip
, regs
->xer
, regs
->link
, regs
, regs
->trap
, regs
->dar
);
85 printf("MSR: %08lx EE: %01x PR: %01x FP:"
86 " %01x ME: %01x IR/DR: %01x%01x\n",
87 regs
->msr
, regs
->msr
& MSR_EE
? 1 : 0,
88 regs
->msr
& MSR_PR
? 1 : 0, regs
->msr
& MSR_FP
? 1 : 0,
89 regs
->msr
& MSR_ME
? 1 : 0, regs
->msr
& MSR_IR
? 1 : 0,
90 regs
->msr
& MSR_DR
? 1 : 0);
93 for (i
= 0; i
< 32; i
++) {
95 printf("GPR%02d: ", i
);
98 printf("%08lX ", regs
->gpr
[i
]);
107 _exception(int signr
, struct pt_regs
*regs
)
110 print_backtrace((unsigned long *)regs
->gpr
[1]);
111 panic("Exception in kernel pc %lx signal %d", regs
->nip
, signr
);
115 MachineCheckException(struct pt_regs
*regs
)
119 /* Probing PCI using config cycles cause this exception
120 * when a device is not present. Catch it and return to
121 * the PCI exception handler.
123 if ((fixup
= search_exception_table(regs
->nip
)) != 0) {
128 #if defined(CONFIG_CMD_KGDB)
129 if (debugger_exception_handler
&& (*debugger_exception_handler
) (regs
))
133 printf("Machine check in kernel mode.\n");
134 printf("Caused by (from msr): ");
135 printf("regs %p ", regs
);
136 switch ( regs
->msr
& 0x001F0000) {
137 case (0x80000000>>11):
138 printf("MSS error. MSSSR0: %08x\n", mfspr(SPRN_MSSSR0
));
140 case (0x80000000>>12):
141 printf("Machine check signal - probably due to mm fault\n"
144 case (0x80000000 >> 13):
145 printf("Transfer error ack signal\n");
147 case (0x80000000 >> 14):
148 printf("Data parity signal\n");
150 case (0x80000000 >> 15):
151 printf("Address parity signal\n");
154 printf("Unknown values in msr\n");
157 print_backtrace((unsigned long *)regs
->gpr
[1]);
158 panic("machine check");
162 AlignmentException(struct pt_regs
*regs
)
164 #if defined(CONFIG_CMD_KGDB)
165 if (debugger_exception_handler
&& (*debugger_exception_handler
) (regs
))
169 print_backtrace((unsigned long *)regs
->gpr
[1]);
170 panic("Alignment Exception");
174 ProgramCheckException(struct pt_regs
*regs
)
176 unsigned char *p
= regs
? (unsigned char *)(regs
->nip
) : NULL
;
179 #if defined(CONFIG_CMD_KGDB)
180 if (debugger_exception_handler
&& (*debugger_exception_handler
) (regs
))
185 p
= (unsigned char *)((unsigned long)p
& 0xFFFFFFE0);
187 for (i
= 0; i
< 256; i
+= 16) {
188 printf("%08x: ", (unsigned int)p
+ i
);
189 for (j
= 0; j
< 16; j
++) {
190 printf("%02x ", p
[i
+ j
]);
195 print_backtrace((unsigned long *)regs
->gpr
[1]);
196 panic("Program Check Exception");
200 SoftEmuException(struct pt_regs
*regs
)
202 #if defined(CONFIG_CMD_KGDB)
203 if (debugger_exception_handler
&& (*debugger_exception_handler
) (regs
))
207 print_backtrace((unsigned long *)regs
->gpr
[1]);
208 panic("Software Emulation Exception");
212 UnknownException(struct pt_regs
*regs
)
214 #if defined(CONFIG_CMD_KGDB)
215 if (debugger_exception_handler
&& (*debugger_exception_handler
) (regs
))
218 printf("UnknownException regs@%lx\n", (ulong
)regs
);
219 printf("Bad trap at PC: %lx, SR: %lx, vector=%lx\n",
220 regs
->nip
, regs
->msr
, regs
->trap
);
225 * Probe an address by reading.
226 * If not present, return -1,
227 * otherwise return 0.
230 addr_probe(uint
*addr
)