1 /*
2 * linux/arch/powerpc/kernel/traps.c
3 *
4 * Copyright 2007 Freescale Semiconductor.
5 * Copyright (C) 2003 Motorola
6 * Modified by Xianghua Xiao(x.xiao@motorola.com)
7 *
8 * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
9 *
10 * Modified by Cort Dougan (cort@cs.nmt.edu)
11 * and Paul Mackerras (paulus@cs.anu.edu.au)
12 *
13 * (C) Copyright 2000
14 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
15 *
16 * See file CREDITS for list of people who contributed to this
17 * project.
18 *
19 * This program is free software; you can redistribute it and/or
20 * modify it under the terms of the GNU General Public License as
21 * published by the Free Software Foundation; either version 2 of
22 * the License, or (at your option) any later version.
23 *
24 * This program is distributed in the hope that it will be useful,
25 * but WITHOUT ANY WARRANTY; without even the implied warranty of
26 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
27 * GNU General Public License for more details.
28 *
29 * You should have received a copy of the GNU General Public License
30 * along with this program; if not, write to the Free Software
31 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
32 * MA 02111-1307 USA
33 */
34
35 /*
36 * This file handles the architecture-dependent parts of hardware exceptions
37 */
38
39 #include <common.h>
40 #include <command.h>
41 #include <kgdb.h>
42 #include <asm/processor.h>
43
44 DECLARE_GLOBAL_DATA_PTR;
45
46 /* Returns 0 if exception not found and fixup otherwise. */
47 extern unsigned long search_exception_table(unsigned long);
48
49 /*
50 * End of addressable memory. This may be less than the actual
51 * amount of memory on the system if we're unable to keep all
52 * the memory mapped in.
53 */
54 extern ulong get_effective_memsize(void);
55 #define END_OF_MEM (gd->bd->bi_memstart + get_effective_memsize())
56
set_tsr(unsigned long val)57 static __inline__ void set_tsr(unsigned long val)
58 {
59 asm volatile("mtspr 0x150, %0" : : "r" (val));
60 }
61
get_esr(void)62 static __inline__ unsigned long get_esr(void)
63 {
64 unsigned long val;
65 asm volatile("mfspr %0, 0x03e" : "=r" (val) :);
66 return val;
67 }
68
69 #define ESR_MCI 0x80000000
70 #define ESR_PIL 0x08000000
71 #define ESR_PPR 0x04000000
72 #define ESR_PTR 0x02000000
73 #define ESR_DST 0x00800000
74 #define ESR_DIZ 0x00400000
75 #define ESR_U0F 0x00008000
76
77 #if defined(CONFIG_CMD_BEDBUG)
78 extern void do_bedbug_breakpoint(struct pt_regs *);
79 #endif
80
81 /*
82 * Trap & Exception support
83 */
84
85 void
print_backtrace(unsigned long * sp)86 print_backtrace(unsigned long *sp)
87 {
88 int cnt = 0;
89 unsigned long i;
90
91 printf("Call backtrace: ");
92 while (sp) {
93 if ((uint)sp > END_OF_MEM)
94 break;
95
96 i = sp[1];
97 if (cnt++ % 7 == 0)
98 printf("\n");
99 printf("%08lX ", i);
100 if (cnt > 32) break;
101 sp = (unsigned long *)*sp;
102 }
103 printf("\n");
104 }
105
show_regs(struct pt_regs * regs)106 void show_regs(struct pt_regs * regs)
107 {
108 int i;
109
110 printf("NIP: %08lX XER: %08lX LR: %08lX REGS: %p TRAP: %04lx DAR: %08lX\n",
111 regs->nip, regs->xer, regs->link, regs, regs->trap, regs->dar);
112 printf("MSR: %08lx EE: %01x PR: %01x FP: %01x ME: %01x IR/DR: %01x%01x\n",
113 regs->msr, regs->msr&MSR_EE ? 1 : 0, regs->msr&MSR_PR ? 1 : 0,
114 regs->msr & MSR_FP ? 1 : 0,regs->msr&MSR_ME ? 1 : 0,
115 regs->msr&MSR_IR ? 1 : 0,
116 regs->msr&MSR_DR ? 1 : 0);
117
118 printf("\n");
119 for (i = 0; i < 32; i++) {
120 if ((i % 8) == 0)
121 {
122 printf("GPR%02d: ", i);
123 }
124
125 printf("%08lX ", regs->gpr[i]);
126 if ((i % 8) == 7)
127 {
128 printf("\n");
129 }
130 }
131 }
132
133
134 void
_exception(int signr,struct pt_regs * regs)135 _exception(int signr, struct pt_regs *regs)
136 {
137 show_regs(regs);
138 print_backtrace((unsigned long *)regs->gpr[1]);
139 panic("Exception in kernel pc %lx signal %d",regs->nip,signr);
140 }
141
142 void
CritcalInputException(struct pt_regs * regs)143 CritcalInputException(struct pt_regs *regs)
144 {
145 panic("Critical Input Exception");
146 }
147
148 int machinecheck_count = 0;
149 int machinecheck_error = 0;
150 void
MachineCheckException(struct pt_regs * regs)151 MachineCheckException(struct pt_regs *regs)
152 {
153 unsigned long fixup;
154 unsigned int mcsr, mcsrr0, mcsrr1, mcar;
155
156 /* Probing PCI using config cycles cause this exception
157 * when a device is not present. Catch it and return to
158 * the PCI exception handler.
159 */
160 if ((fixup = search_exception_table(regs->nip)) != 0) {
161 regs->nip = fixup;
162 return;
163 }
164
165 mcsrr0 = mfspr(SPRN_MCSRR0);
166 mcsrr1 = mfspr(SPRN_MCSRR1);
167 mcsr = mfspr(SPRN_MCSR);
168 mcar = mfspr(SPRN_MCAR);
169
170 machinecheck_count++;
171 machinecheck_error=1;
172
173 #if defined(CONFIG_CMD_KGDB)
174 if (debugger_exception_handler && (*debugger_exception_handler)(regs))
175 return;
176 #endif
177
178 printf("Machine check in kernel mode.\n");
179 printf("Caused by (from mcsr): ");
180 printf("mcsr = 0x%08x\n", mcsr);
181 if (mcsr & 0x80000000)
182 printf("Machine check input pin\n");
183 if (mcsr & 0x40000000)
184 printf("Instruction cache parity error\n");
185 if (mcsr & 0x20000000)
186 printf("Data cache push parity error\n");
187 if (mcsr & 0x10000000)
188 printf("Data cache parity error\n");
189 if (mcsr & 0x00000080)
190 printf("Bus instruction address error\n");
191 if (mcsr & 0x00000040)
192 printf("Bus Read address error\n");
193 if (mcsr & 0x00000020)
194 printf("Bus Write address error\n");
195 if (mcsr & 0x00000010)
196 printf("Bus Instruction data bus error\n");
197 if (mcsr & 0x00000008)
198 printf("Bus Read data bus error\n");
199 if (mcsr & 0x00000004)
200 printf("Bus Write bus error\n");
201 if (mcsr & 0x00000002)
202 printf("Bus Instruction parity error\n");
203 if (mcsr & 0x00000001)
204 printf("Bus Read parity error\n");
205
206 show_regs(regs);
207 printf("MCSR=0x%08x \tMCSRR0=0x%08x \nMCSRR1=0x%08x \tMCAR=0x%08x\n",
208 mcsr, mcsrr0, mcsrr1, mcar);
209 print_backtrace((unsigned long *)regs->gpr[1]);
210 if (machinecheck_count > 10) {
211 panic("machine check count too high\n");
212 }
213
214 if (machinecheck_count > 1) {
215 regs->nip += 4; /* skip offending instruction */
216 printf("Skipping current instr, Returning to 0x%08lx\n",
217 regs->nip);
218 } else {
219 printf("Returning back to 0x%08lx\n",regs->nip);
220 }
221 }
222
223 void
AlignmentException(struct pt_regs * regs)224 AlignmentException(struct pt_regs *regs)
225 {
226 #if defined(CONFIG_CMD_KGDB)
227 if (debugger_exception_handler && (*debugger_exception_handler)(regs))
228 return;
229 #endif
230
231 show_regs(regs);
232 print_backtrace((unsigned long *)regs->gpr[1]);
233 panic("Alignment Exception");
234 }
235
236 void
ProgramCheckException(struct pt_regs * regs)237 ProgramCheckException(struct pt_regs *regs)
238 {
239 long esr_val;
240
241 #if defined(CONFIG_CMD_KGDB)
242 if (debugger_exception_handler && (*debugger_exception_handler)(regs))
243 return;
244 #endif
245
246 show_regs(regs);
247
248 esr_val = get_esr();
249 if( esr_val & ESR_PIL )
250 printf( "** Illegal Instruction **\n" );
251 else if( esr_val & ESR_PPR )
252 printf( "** Privileged Instruction **\n" );
253 else if( esr_val & ESR_PTR )
254 printf( "** Trap Instruction **\n" );
255
256 print_backtrace((unsigned long *)regs->gpr[1]);
257 panic("Program Check Exception");
258 }
259
260 void
PITException(struct pt_regs * regs)261 PITException(struct pt_regs *regs)
262 {
263 /*
264 * Reset PIT interrupt
265 */
266 set_tsr(0x0c000000);
267
268 /*
269 * Call timer_interrupt routine in interrupts.c
270 */
271 timer_interrupt(NULL);
272 }
273
274
275 void
UnknownException(struct pt_regs * regs)276 UnknownException(struct pt_regs *regs)
277 {
278 #if defined(CONFIG_CMD_KGDB)
279 if (debugger_exception_handler && (*debugger_exception_handler)(regs))
280 return;
281 #endif
282
283 printf("Bad trap at PC: %lx, SR: %lx, vector=%lx\n",
284 regs->nip, regs->msr, regs->trap);
285 _exception(0, regs);
286 }
287
288 void
ExtIntException(struct pt_regs * regs)289 ExtIntException(struct pt_regs *regs)
290 {
291 volatile ccsr_pic_t *pic = (void *)(CONFIG_SYS_MPC85xx_PIC_ADDR);
292
293 uint vect;
294
295 #if defined(CONFIG_CMD_KGDB)
296 if (debugger_exception_handler && (*debugger_exception_handler)(regs))
297 return;
298 #endif
299
300 printf("External Interrupt Exception at PC: %lx, SR: %lx, vector=%lx",
301 regs->nip, regs->msr, regs->trap);
302 vect = pic->iack0;
303 printf(" irq IACK0@%05x=%d\n",(int)&pic->iack0,vect);
304 show_regs(regs);
305 print_backtrace((unsigned long *)regs->gpr[1]);
306 }
307
308 void
DebugException(struct pt_regs * regs)309 DebugException(struct pt_regs *regs)
310 {
311 printf("Debugger trap at @ %lx\n", regs->nip );
312 show_regs(regs);
313 #if defined(CONFIG_CMD_BEDBUG)
314 do_bedbug_breakpoint( regs );
315 #endif
316 }
317
318 /* Probe an address by reading. If not present, return -1, otherwise
319 * return 0.
320 */
321 int
addr_probe(uint * addr)322 addr_probe(uint *addr)
323 {
324 return 0;
325 }
326