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wdenkaffae2b2002-08-17 09:36:01 +00001/*
2 * linux/arch/ppc/kernel/traps.c
3 *
4 * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
5 *
6 * Modified by Cort Dougan (cort@cs.nmt.edu)
7 * and Paul Mackerras (paulus@cs.anu.edu.au)
8 *
9 * (C) Copyright 2000
10 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
11 *
12 * See file CREDITS for list of people who contributed to this
13 * project.
14 *
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.
19 *
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.
24 *
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,
28 * MA 02111-1307 USA
29 */
30
31/*
32 * This file handles the architecture-dependent parts of hardware exceptions
33 */
34
35#include <common.h>
36#include <command.h>
37#include <asm/processor.h>
wdenk3c74e322004-02-22 23:46:08 +000038#include <asm/m8260_pci.h>
wdenkaffae2b2002-08-17 09:36:01 +000039
Jon Loeliger44312832007-07-09 19:06:00 -050040#if defined(CONFIG_CMD_KGDB)
wdenkaffae2b2002-08-17 09:36:01 +000041int (*debugger_exception_handler)(struct pt_regs *) = 0;
42#endif
43
44/* Returns 0 if exception not found and fixup otherwise. */
45extern unsigned long search_exception_table(unsigned long);
46
47/* THIS NEEDS CHANGING to use the board info structure.
48*/
49#define END_OF_MEM 0x02000000
50
51/*
52 * Trap & Exception support
53 */
54
55void
56print_backtrace(unsigned long *sp)
57{
58 int cnt = 0;
59 unsigned long i;
60
wdenk4b9206e2004-03-23 22:14:11 +000061 puts ("Call backtrace: ");
wdenkaffae2b2002-08-17 09:36:01 +000062 while (sp) {
63 if ((uint)sp > END_OF_MEM)
64 break;
65
66 i = sp[1];
67 if (cnt++ % 7 == 0)
wdenk4b9206e2004-03-23 22:14:11 +000068 putc ('\n');
wdenkaffae2b2002-08-17 09:36:01 +000069 printf("%08lX ", i);
70 if (cnt > 32) break;
71 sp = (unsigned long *)*sp;
72 }
wdenk4b9206e2004-03-23 22:14:11 +000073 putc ('\n');
wdenkaffae2b2002-08-17 09:36:01 +000074}
75
76void show_regs(struct pt_regs * regs)
77{
78 int i;
79
80 printf("NIP: %08lX XER: %08lX LR: %08lX REGS: %p TRAP: %04lx DAR: %08lX\n",
81 regs->nip, regs->xer, regs->link, regs, regs->trap, regs->dar);
82 printf("MSR: %08lx EE: %01x PR: %01x FP: %01x ME: %01x IR/DR: %01x%01x\n",
83 regs->msr, regs->msr&MSR_EE ? 1 : 0, regs->msr&MSR_PR ? 1 : 0,
84 regs->msr & MSR_FP ? 1 : 0,regs->msr&MSR_ME ? 1 : 0,
85 regs->msr&MSR_IR ? 1 : 0,
86 regs->msr&MSR_DR ? 1 : 0);
87
wdenk4b9206e2004-03-23 22:14:11 +000088 putc ('\n');
wdenkaffae2b2002-08-17 09:36:01 +000089 for (i = 0; i < 32; i++) {
wdenk3c74e322004-02-22 23:46:08 +000090 if ((i % 8) == 0) {
wdenkaffae2b2002-08-17 09:36:01 +000091 printf("GPR%02d: ", i);
92 }
93
94 printf("%08lX ", regs->gpr[i]);
wdenk3c74e322004-02-22 23:46:08 +000095 if ((i % 8) == 7) {
wdenk4b9206e2004-03-23 22:14:11 +000096 putc ('\n');
wdenkaffae2b2002-08-17 09:36:01 +000097 }
98 }
99}
100
101
102void
103_exception(int signr, struct pt_regs *regs)
104{
105 show_regs(regs);
106 print_backtrace((unsigned long *)regs->gpr[1]);
107 panic("Exception in kernel pc %lx signal %d",regs->nip,signr);
108}
109
wdenk3c74e322004-02-22 23:46:08 +0000110#ifdef CONFIG_PCI
111void dump_pci (void)
112{
113
114 volatile immap_t *immap = (immap_t *) CFG_IMMR;
115
116 printf ("PCI: err status %x err mask %x err ctrl %x\n",
117 le32_to_cpu (immap->im_pci.pci_esr),
118 le32_to_cpu (immap->im_pci.pci_emr),
119 le32_to_cpu (immap->im_pci.pci_ecr));
120 printf (" error address %x error data %x ctrl %x\n",
121 le32_to_cpu (immap->im_pci.pci_eacr),
122 le32_to_cpu (immap->im_pci.pci_edcr),
123 le32_to_cpu (immap->im_pci.pci_eccr));
124
125}
126#endif
127
wdenkaffae2b2002-08-17 09:36:01 +0000128void
129MachineCheckException(struct pt_regs *regs)
130{
131 unsigned long fixup;
132
133 /* Probing PCI using config cycles cause this exception
134 * when a device is not present. Catch it and return to
135 * the PCI exception handler.
136 */
wdenk3c74e322004-02-22 23:46:08 +0000137#ifdef CONFIG_PCI
138 volatile immap_t *immap = (immap_t *)CFG_IMMR;
139#ifdef DEBUG
140 dump_pci();
141#endif
142 /* clear the error in the error status register */
wdenk6fb6af62004-03-23 23:20:24 +0000143 if(immap->im_pci.pci_esr & cpu_to_le32(PCI_ERROR_PCI_NO_RSP)) {
wdenk3c74e322004-02-22 23:46:08 +0000144 immap->im_pci.pci_esr = cpu_to_le32(PCI_ERROR_PCI_NO_RSP);
145 return;
146 }
147#endif
wdenkaffae2b2002-08-17 09:36:01 +0000148 if ((fixup = search_exception_table(regs->nip)) != 0) {
149 regs->nip = fixup;
150 return;
151 }
152
Jon Loeliger44312832007-07-09 19:06:00 -0500153#if defined(CONFIG_CMD_KGDB)
wdenkaffae2b2002-08-17 09:36:01 +0000154 if (debugger_exception_handler && (*debugger_exception_handler)(regs))
155 return;
156#endif
157
wdenk4b9206e2004-03-23 22:14:11 +0000158 puts ("Machine check in kernel mode.\n"
159 "Caused by (from msr): ");
wdenkaffae2b2002-08-17 09:36:01 +0000160 printf("regs %p ",regs);
wdenk63e73c92004-02-23 22:22:28 +0000161 switch( regs->msr & 0x000F0000) {
162 case (0x80000000>>12):
wdenk4b9206e2004-03-23 22:14:11 +0000163 puts ("Machine check signal - probably due to mm fault\n"
wdenkaffae2b2002-08-17 09:36:01 +0000164 "with mmu off\n");
165 break;
wdenk63e73c92004-02-23 22:22:28 +0000166 case (0x80000000>>13):
wdenk4b9206e2004-03-23 22:14:11 +0000167 puts ("Transfer error ack signal\n");
wdenkaffae2b2002-08-17 09:36:01 +0000168 break;
wdenk63e73c92004-02-23 22:22:28 +0000169 case (0x80000000>>14):
wdenk4b9206e2004-03-23 22:14:11 +0000170 puts ("Data parity signal\n");
wdenkaffae2b2002-08-17 09:36:01 +0000171 break;
wdenk63e73c92004-02-23 22:22:28 +0000172 case (0x80000000>>15):
wdenk4b9206e2004-03-23 22:14:11 +0000173 puts ("Address parity signal\n");
wdenkaffae2b2002-08-17 09:36:01 +0000174 break;
175 default:
wdenk4b9206e2004-03-23 22:14:11 +0000176 puts ("Unknown values in msr\n");
wdenkaffae2b2002-08-17 09:36:01 +0000177 }
178 show_regs(regs);
179 print_backtrace((unsigned long *)regs->gpr[1]);
wdenk3c74e322004-02-22 23:46:08 +0000180#ifdef CONFIG_PCI
181 dump_pci();
182#endif
wdenkaffae2b2002-08-17 09:36:01 +0000183 panic("machine check");
184}
185
186void
187AlignmentException(struct pt_regs *regs)
188{
Jon Loeliger44312832007-07-09 19:06:00 -0500189#if defined(CONFIG_CMD_KGDB)
wdenkaffae2b2002-08-17 09:36:01 +0000190 if (debugger_exception_handler && (*debugger_exception_handler)(regs))
191 return;
192#endif
193 show_regs(regs);
194 print_backtrace((unsigned long *)regs->gpr[1]);
195 panic("Alignment Exception");
196}
197
198void
199ProgramCheckException(struct pt_regs *regs)
200{
Jon Loeliger44312832007-07-09 19:06:00 -0500201#if defined(CONFIG_CMD_KGDB)
wdenkaffae2b2002-08-17 09:36:01 +0000202 if (debugger_exception_handler && (*debugger_exception_handler)(regs))
203 return;
204#endif
205 show_regs(regs);
206 print_backtrace((unsigned long *)regs->gpr[1]);
207 panic("Program Check Exception");
208}
209
210void
211SoftEmuException(struct pt_regs *regs)
212{
Jon Loeliger44312832007-07-09 19:06:00 -0500213#if defined(CONFIG_CMD_KGDB)
wdenkaffae2b2002-08-17 09:36:01 +0000214 if (debugger_exception_handler && (*debugger_exception_handler)(regs))
215 return;
216#endif
217 show_regs(regs);
218 print_backtrace((unsigned long *)regs->gpr[1]);
219 panic("Software Emulation Exception");
220}
221
222
223void
224UnknownException(struct pt_regs *regs)
225{
Jon Loeliger44312832007-07-09 19:06:00 -0500226#if defined(CONFIG_CMD_KGDB)
wdenkaffae2b2002-08-17 09:36:01 +0000227 if (debugger_exception_handler && (*debugger_exception_handler)(regs))
228 return;
229#endif
230 printf("Bad trap at PC: %lx, SR: %lx, vector=%lx\n",
231 regs->nip, regs->msr, regs->trap);
232 _exception(0, regs);
233}
234
Jon Loeliger44312832007-07-09 19:06:00 -0500235#if defined(CONFIG_CMD_BEDBUG)
wdenkaffae2b2002-08-17 09:36:01 +0000236extern void do_bedbug_breakpoint(struct pt_regs *);
237#endif
238
239void
240DebugException(struct pt_regs *regs)
241{
242
243 printf("Debugger trap at @ %lx\n", regs->nip );
244 show_regs(regs);
Jon Loeliger44312832007-07-09 19:06:00 -0500245#if defined(CONFIG_CMD_BEDBUG)
wdenkaffae2b2002-08-17 09:36:01 +0000246 do_bedbug_breakpoint( regs );
247#endif
248}
249
250/* Probe an address by reading. If not present, return -1, otherwise
251 * return 0.
252 */
253int
254addr_probe(uint *addr)
255{
256#if 0
257 int retval;
258
259 __asm__ __volatile__( \
260 "1: lwz %0,0(%1)\n" \
261 " eieio\n" \
262 " li %0,0\n" \
263 "2:\n" \
264 ".section .fixup,\"ax\"\n" \
265 "3: li %0,-1\n" \
266 " b 2b\n" \
267 ".section __ex_table,\"a\"\n" \
268 " .align 2\n" \
269 " .long 1b,3b\n" \
270 ".text" \
271 : "=r" (retval) : "r"(addr));
272
273 return (retval);
274#endif
275 return 0;
276}