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wdenk9c53f402003-10-15 23:53:47 +00001/*
2 * linux/arch/ppc/kernel/traps.c
3 *
4 * Copyright (C) 2003 Motorola
5 * Modified by Xianghua Xiao(x.xiao@motorola.com)
6 *
7 * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
8 *
9 * Modified by Cort Dougan (cort@cs.nmt.edu)
10 * and Paul Mackerras (paulus@cs.anu.edu.au)
11 *
12 * (C) Copyright 2000
13 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
14 *
15 * See file CREDITS for list of people who contributed to this
16 * project.
17 *
18 * This program is free software; you can redistribute it and/or
19 * modify it under the terms of the GNU General Public License as
20 * published by the Free Software Foundation; either version 2 of
21 * the License, or (at your option) any later version.
22 *
23 * This program is distributed in the hope that it will be useful,
24 * but WITHOUT ANY WARRANTY; without even the implied warranty of
wdenk492b9e72004-08-01 23:02:45 +000025 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
wdenk9c53f402003-10-15 23:53:47 +000026 * GNU General Public License for more details.
27 *
28 * You should have received a copy of the GNU General Public License
29 * along with this program; if not, write to the Free Software
30 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
31 * MA 02111-1307 USA
32 */
33
34/*
35 * This file handles the architecture-dependent parts of hardware exceptions
36 */
37
38#include <common.h>
39#include <command.h>
40#include <asm/processor.h>
41
42#if (CONFIG_COMMANDS & CFG_CMD_KGDB)
43int (*debugger_exception_handler)(struct pt_regs *) = 0;
44#endif
45
46/* Returns 0 if exception not found and fixup otherwise. */
47extern unsigned long search_exception_table(unsigned long);
48
wdenk492b9e72004-08-01 23:02:45 +000049/*
50 * End of memory as shown by board info and determined by DDR setup.
wdenk9c53f402003-10-15 23:53:47 +000051 */
wdenk492b9e72004-08-01 23:02:45 +000052#define END_OF_MEM (gd->bd->bi_memstart + gd->bd->bi_memsize)
wdenk9c53f402003-10-15 23:53:47 +000053
54
55static __inline__ void set_tsr(unsigned long val)
56{
57 asm volatile("mtspr 0x150, %0" : : "r" (val));
58}
59
60static __inline__ unsigned long get_esr(void)
61{
62 unsigned long val;
63 asm volatile("mfspr %0, 0x03e" : "=r" (val) :);
64 return val;
65}
66
67#define ESR_MCI 0x80000000
68#define ESR_PIL 0x08000000
69#define ESR_PPR 0x04000000
70#define ESR_PTR 0x02000000
71#define ESR_DST 0x00800000
72#define ESR_DIZ 0x00400000
73#define ESR_U0F 0x00008000
74
75#if (CONFIG_COMMANDS & CFG_CMD_BEDBUG)
76extern void do_bedbug_breakpoint(struct pt_regs *);
77#endif
78
79/*
80 * Trap & Exception support
81 */
82
83void
84print_backtrace(unsigned long *sp)
85{
wdenk492b9e72004-08-01 23:02:45 +000086 DECLARE_GLOBAL_DATA_PTR;
wdenk9c53f402003-10-15 23:53:47 +000087 int cnt = 0;
88 unsigned long i;
89
90 printf("Call backtrace: ");
91 while (sp) {
92 if ((uint)sp > END_OF_MEM)
93 break;
94
95 i = sp[1];
96 if (cnt++ % 7 == 0)
97 printf("\n");
98 printf("%08lX ", i);
99 if (cnt > 32) break;
100 sp = (unsigned long *)*sp;
101 }
102 printf("\n");
103}
104
105void show_regs(struct pt_regs * regs)
106{
107 int i;
108
109 printf("NIP: %08lX XER: %08lX LR: %08lX REGS: %p TRAP: %04lx DAR: %08lX\n",
110 regs->nip, regs->xer, regs->link, regs, regs->trap, regs->dar);
111 printf("MSR: %08lx EE: %01x PR: %01x FP: %01x ME: %01x IR/DR: %01x%01x\n",
112 regs->msr, regs->msr&MSR_EE ? 1 : 0, regs->msr&MSR_PR ? 1 : 0,
113 regs->msr & MSR_FP ? 1 : 0,regs->msr&MSR_ME ? 1 : 0,
114 regs->msr&MSR_IR ? 1 : 0,
115 regs->msr&MSR_DR ? 1 : 0);
116
117 printf("\n");
118 for (i = 0; i < 32; i++) {
119 if ((i % 8) == 0)
120 {
121 printf("GPR%02d: ", i);
122 }
123
124 printf("%08lX ", regs->gpr[i]);
125 if ((i % 8) == 7)
126 {
127 printf("\n");
128 }
129 }
130}
131
132
133void
134_exception(int signr, struct pt_regs *regs)
135{
136 show_regs(regs);
137 print_backtrace((unsigned long *)regs->gpr[1]);
138 panic("Exception in kernel pc %lx signal %d",regs->nip,signr);
139}
140
141void
142CritcalInputException(struct pt_regs *regs)
143{
144 panic("Critical Input Exception");
145}
146
147void
148MachineCheckException(struct pt_regs *regs)
149{
150 unsigned long fixup;
151
152 /* Probing PCI using config cycles cause this exception
153 * when a device is not present. Catch it and return to
154 * the PCI exception handler.
155 */
156 if ((fixup = search_exception_table(regs->nip)) != 0) {
157 regs->nip = fixup;
158 return;
159 }
160
161#if (CONFIG_COMMANDS & CFG_CMD_KGDB)
162 if (debugger_exception_handler && (*debugger_exception_handler)(regs))
163 return;
164#endif
165
166 printf("Machine check in kernel mode.\n");
167 printf("Caused by (from msr): ");
168 printf("regs %p ",regs);
wdenke97d3d92004-02-23 22:22:28 +0000169 switch( regs->msr & 0x000F0000) {
170 case (0x80000000>>12):
wdenk9c53f402003-10-15 23:53:47 +0000171 printf("Machine check signal - probably due to mm fault\n"
172 "with mmu off\n");
173 break;
wdenke97d3d92004-02-23 22:22:28 +0000174 case (0x80000000>>13):
wdenk9c53f402003-10-15 23:53:47 +0000175 printf("Transfer error ack signal\n");
176 break;
wdenke97d3d92004-02-23 22:22:28 +0000177 case (0x80000000>>14):
wdenk9c53f402003-10-15 23:53:47 +0000178 printf("Data parity signal\n");
179 break;
wdenke97d3d92004-02-23 22:22:28 +0000180 case (0x80000000>>15):
wdenk9c53f402003-10-15 23:53:47 +0000181 printf("Address parity signal\n");
182 break;
183 default:
184 printf("Unknown values in msr\n");
185 }
186 show_regs(regs);
187 print_backtrace((unsigned long *)regs->gpr[1]);
188 panic("machine check");
189}
190
191void
192AlignmentException(struct pt_regs *regs)
193{
194#if (CONFIG_COMMANDS & CFG_CMD_KGDB)
195 if (debugger_exception_handler && (*debugger_exception_handler)(regs))
196 return;
197#endif
198
199 show_regs(regs);
200 print_backtrace((unsigned long *)regs->gpr[1]);
201 panic("Alignment Exception");
202}
203
204void
205ProgramCheckException(struct pt_regs *regs)
206{
207 long esr_val;
208
209#if (CONFIG_COMMANDS & CFG_CMD_KGDB)
210 if (debugger_exception_handler && (*debugger_exception_handler)(regs))
211 return;
212#endif
213
214 show_regs(regs);
215
216 esr_val = get_esr();
217 if( esr_val & ESR_PIL )
218 printf( "** Illegal Instruction **\n" );
219 else if( esr_val & ESR_PPR )
220 printf( "** Privileged Instruction **\n" );
221 else if( esr_val & ESR_PTR )
222 printf( "** Trap Instruction **\n" );
223
224 print_backtrace((unsigned long *)regs->gpr[1]);
225 panic("Program Check Exception");
226}
227
228void
229PITException(struct pt_regs *regs)
230{
231 /*
232 * Reset PIT interrupt
233 */
234 set_tsr(0x0c000000);
235
236 /*
237 * Call timer_interrupt routine in interrupts.c
238 */
239 timer_interrupt(NULL);
240}
241
242
243void
244UnknownException(struct pt_regs *regs)
245{
246#if (CONFIG_COMMANDS & CFG_CMD_KGDB)
247 if (debugger_exception_handler && (*debugger_exception_handler)(regs))
248 return;
249#endif
250
251 printf("Bad trap at PC: %lx, SR: %lx, vector=%lx\n",
252 regs->nip, regs->msr, regs->trap);
253 _exception(0, regs);
254}
255
256void
257DebugException(struct pt_regs *regs)
258{
259 printf("Debugger trap at @ %lx\n", regs->nip );
260 show_regs(regs);
261#if (CONFIG_COMMANDS & CFG_CMD_BEDBUG)
262 do_bedbug_breakpoint( regs );
263#endif
264}
265
wdenk492b9e72004-08-01 23:02:45 +0000266/* Probe an address by reading. If not present, return -1, otherwise
wdenk9c53f402003-10-15 23:53:47 +0000267 * return 0.
268 */
269int
270addr_probe(uint *addr)
271{
272 return 0;
273}