2 * linux/arch/powerpc/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)
8 * fixed Machine Check Reasons by Reinhard Meyer (r.meyer@emk-elektronik.de)
10 * (C) Copyright 2000-2003
11 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
13 * See file CREDITS for list of people who contributed to this
16 * This program is free software; you can redistribute it and/or
17 * modify it under the terms of the GNU General Public License as
18 * published by the Free Software Foundation; either version 2 of
19 * the License, or (at your option) any later version.
21 * This program is distributed in the hope that it will be useful,
22 * but WITHOUT ANY WARRANTY; without even the implied warranty of
23 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
24 * GNU General Public License for more details.
26 * You should have received a copy of the GNU General Public License
27 * along with this program; if not, write to the Free Software
28 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
33 * This file handles the architecture-dependent parts of hardware exceptions
39 #include <asm/processor.h>
41 /* Returns 0 if exception not found and fixup otherwise. */
42 extern unsigned long search_exception_table(unsigned long);
44 /* THIS NEEDS CHANGING to use the board info structure.
46 #define END_OF_MEM 0x02000000
49 * Trap & Exception support
53 print_backtrace(unsigned long *sp
)
58 printf("Call backtrace: ");
60 if ((uint
)sp
> END_OF_MEM
)
68 sp
= (unsigned long *)*sp
;
73 void show_regs(struct pt_regs
* regs
)
77 printf("NIP: %08lX XER: %08lX LR: %08lX REGS: %p TRAP: %04lx DAR: %08lX\n",
78 regs
->nip
, regs
->xer
, regs
->link
, regs
, regs
->trap
, regs
->dar
);
79 printf("MSR: %08lx EE: %01x PR: %01x FP: %01x ME: %01x IR/DR: %01x%01x\n",
80 regs
->msr
, regs
->msr
&MSR_EE
? 1 : 0, regs
->msr
&MSR_PR
? 1 : 0,
81 regs
->msr
& MSR_FP
? 1 : 0,regs
->msr
&MSR_ME
? 1 : 0,
82 regs
->msr
&MSR_IR
? 1 : 0,
83 regs
->msr
&MSR_DR
? 1 : 0);
86 for (i
= 0; i
< 32; i
++) {
89 printf("GPR%02d: ", i
);
92 printf("%08lX ", regs
->gpr
[i
]);
102 _exception(int signr
, struct pt_regs
*regs
)
105 print_backtrace((unsigned long *)regs
->gpr
[1]);
106 panic("Exception in kernel pc %lx signal %d",regs
->nip
,signr
);
110 MachineCheckException(struct pt_regs
*regs
)
114 /* Probing PCI using config cycles cause this exception
115 * when a device is not present. Catch it and return to
116 * the PCI exception handler.
118 if ((fixup
= search_exception_table(regs
->nip
)) != 0) {
123 #if defined(CONFIG_CMD_KGDB)
124 if (debugger_exception_handler
&& (*debugger_exception_handler
)(regs
))
128 printf("Machine check in kernel mode.\n");
129 printf("Caused by (from msr): ");
130 printf("regs %p ",regs
);
131 /* refer to 603e Manual (MPC603EUM/AD), chapter 4.5.2.1 */
132 switch( regs
->msr
& 0x000F0000)
134 case (0x80000000>>12) :
135 printf("Machine check signal - probably due to mm fault\n"
138 case (0x80000000>>13) :
139 printf("Transfer error ack signal\n");
141 case (0x80000000>>14) :
142 printf("Data parity signal\n");
144 case (0x80000000>>15) :
145 printf("Address parity signal\n");
148 printf("Unknown values in msr\n");
151 print_backtrace((unsigned long *)regs
->gpr
[1]);
152 panic("machine check");
156 AlignmentException(struct pt_regs
*regs
)
158 #if defined(CONFIG_CMD_KGDB)
159 if (debugger_exception_handler
&& (*debugger_exception_handler
)(regs
))
163 print_backtrace((unsigned long *)regs
->gpr
[1]);
164 panic("Alignment Exception");
168 ProgramCheckException(struct pt_regs
*regs
)
170 #if defined(CONFIG_CMD_KGDB)
171 if (debugger_exception_handler
&& (*debugger_exception_handler
)(regs
))
175 print_backtrace((unsigned long *)regs
->gpr
[1]);
176 panic("Program Check Exception");
180 SoftEmuException(struct pt_regs
*regs
)
182 #if defined(CONFIG_CMD_KGDB)
183 if (debugger_exception_handler
&& (*debugger_exception_handler
)(regs
))
187 print_backtrace((unsigned long *)regs
->gpr
[1]);
188 panic("Software Emulation Exception");
193 UnknownException(struct pt_regs
*regs
)
195 #if defined(CONFIG_CMD_KGDB)
196 if (debugger_exception_handler
&& (*debugger_exception_handler
)(regs
))
199 printf("Bad trap at PC: %lx, SR: %lx, vector=%lx\n",
200 regs
->nip
, regs
->msr
, regs
->trap
);
204 #if defined(CONFIG_CMD_BEDBUG)
205 extern void do_bedbug_breakpoint(struct pt_regs
*);
209 DebugException(struct pt_regs
*regs
)
212 printf("Debugger trap at @ %lx\n", regs
->nip
);
214 #if defined(CONFIG_CMD_BEDBUG)
215 do_bedbug_breakpoint( regs
);
219 /* Probe an address by reading. If not present, return -1, otherwise
223 addr_probe(uint
*addr
)
228 __asm__
__volatile__( \
229 "1: lwz %0,0(%1)\n" \
233 ".section .fixup,\"ax\"\n" \
236 ".section __ex_table,\"a\"\n" \
240 : "=r" (retval
) : "r"(addr
));