2 * linux/arch/ppc/kernel/traps.c
4 * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
6 * Modified by Cort Dougan (cort@cs.nmt.edu)
7 * and Paul Mackerras (paulus@cs.anu.edu.au)
10 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
12 * See file CREDITS for list of people who contributed to this
15 * This program is free software; you can redistribute it and/or
16 * modify it under the terms of the GNU General Public License as
17 * published by the Free Software Foundation; either version 2 of
18 * the License, or (at your option) any later version.
20 * This program is distributed in the hope that it will be useful,
21 * but WITHOUT ANY WARRANTY; without even the implied warranty of
22 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
23 * GNU General Public License for more details.
25 * You should have received a copy of the GNU General Public License
26 * along with this program; if not, write to the Free Software
27 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
32 * This file handles the architecture-dependent parts of hardware exceptions
37 #include <asm/processor.h>
39 #ifdef CONFIG_AMIGAONEG3SE
40 DECLARE_GLOBAL_DATA_PTR
;
43 #if defined(CONFIG_CMD_KGDB)
44 int (*debugger_exception_handler
)(struct pt_regs
*) = 0;
47 /* Returns 0 if exception not found and fixup otherwise. */
48 extern unsigned long search_exception_table(unsigned long);
50 /* THIS NEEDS CHANGING to use the board info structure.
52 #ifdef CONFIG_AMIGAONEG3SE
53 #define END_OF_MEM (gd->bd->bi_memstart + gd->bd->bi_memsize)
55 #define END_OF_MEM 0x02000000
59 * Trap & Exception support
63 print_backtrace(unsigned long *sp
)
68 printf("Call backtrace: ");
70 if ((uint
)sp
> END_OF_MEM
)
78 sp
= (unsigned long *)*sp
;
84 show_regs(struct pt_regs
* regs
)
88 printf("NIP: %08lX XER: %08lX LR: %08lX REGS:"
89 " %p TRAP: %04lx DAR: %08lX\n",
90 regs
->nip
, regs
->xer
, regs
->link
, regs
, regs
->trap
, regs
->dar
);
91 printf("MSR: %08lx EE: %01x PR: %01x FP:"
92 " %01x ME: %01x IR/DR: %01x%01x\n",
93 regs
->msr
, regs
->msr
&MSR_EE
? 1 : 0, regs
->msr
&MSR_PR
? 1 : 0,
94 regs
->msr
& MSR_FP
? 1 : 0,regs
->msr
&MSR_ME
? 1 : 0,
95 regs
->msr
&MSR_IR
? 1 : 0,
96 regs
->msr
&MSR_DR
? 1 : 0);
99 for (i
= 0; i
< 32; i
++) {
102 printf("GPR%02d: ", i
);
105 printf("%08lX ", regs
->gpr
[i
]);
115 _exception(int signr
, struct pt_regs
*regs
)
118 print_backtrace((unsigned long *)regs
->gpr
[1]);
119 panic("Exception in kernel pc %lx signal %d",regs
->nip
,signr
);
123 MachineCheckException(struct pt_regs
*regs
)
127 /* Probing PCI using config cycles cause this exception
128 * when a device is not present. Catch it and return to
129 * the PCI exception handler.
131 if ((fixup
= search_exception_table(regs
->nip
)) != 0) {
136 #if defined(CONFIG_CMD_KGDB)
137 if (debugger_exception_handler
&& (*debugger_exception_handler
)(regs
))
141 printf("Machine check in kernel mode.\n");
142 printf("Caused by (from msr): ");
143 printf("regs %p ",regs
);
144 switch( regs
->msr
& 0x000F0000) {
145 case (0x80000000>>12):
146 printf("Machine check signal - probably due to mm fault\n"
149 case (0x80000000>>13):
150 printf("Transfer error ack signal\n");
152 case (0x80000000>>14):
153 printf("Data parity signal\n");
155 case (0x80000000>>15):
156 printf("Address parity signal\n");
159 printf("Unknown values in msr\n");
162 print_backtrace((unsigned long *)regs
->gpr
[1]);
163 panic("machine check");
167 AlignmentException(struct pt_regs
*regs
)
169 #if defined(CONFIG_CMD_KGDB)
170 if (debugger_exception_handler
&& (*debugger_exception_handler
)(regs
))
174 print_backtrace((unsigned long *)regs
->gpr
[1]);
175 panic("Alignment Exception");
179 ProgramCheckException(struct pt_regs
*regs
)
181 unsigned char *p
= regs
? (unsigned char *)(regs
->nip
) : NULL
;
184 #if defined(CONFIG_CMD_KGDB)
185 if (debugger_exception_handler
&& (*debugger_exception_handler
)(regs
))
190 p
= (unsigned char *) ((unsigned long)p
& 0xFFFFFFE0);
192 for (i
= 0; i
< 256; i
+=16) {
193 printf("%08x: ", (unsigned int)p
+i
);
194 for (j
= 0; j
< 16; j
++) {
195 printf("%02x ", p
[i
+j
]);
200 print_backtrace((unsigned long *)regs
->gpr
[1]);
201 panic("Program Check Exception");
205 SoftEmuException(struct pt_regs
*regs
)
207 #if defined(CONFIG_CMD_KGDB)
208 if (debugger_exception_handler
&& (*debugger_exception_handler
)(regs
))
212 print_backtrace((unsigned long *)regs
->gpr
[1]);
213 panic("Software Emulation Exception");
218 UnknownException(struct pt_regs
*regs
)
220 #if defined(CONFIG_CMD_KGDB)
221 if (debugger_exception_handler
&& (*debugger_exception_handler
)(regs
))
224 printf("Bad trap at PC: %lx, SR: %lx, vector=%lx\n",
225 regs
->nip
, regs
->msr
, regs
->trap
);
229 /* Probe an address by reading. If not present, return -1, otherwise
233 addr_probe(uint
*addr
)
238 __asm__
__volatile__( \
239 "1: lwz %0,0(%1)\n" \
243 ".section .fixup,\"ax\"\n" \
246 ".section __ex_table,\"a\"\n" \
250 : "=r" (retval
) : "r"(addr
));