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wdenkaffae2b2002-08-17 09:36:01 +00001/*
Stefan Roesea47a12b2010-04-15 16:07:28 +02002 * linux/arch/powerpc/kernel/traps.c
wdenkaffae2b2002-08-17 09:36:01 +00003 *
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>
Mike Frysingere39bf1e2010-02-08 15:30:16 -050037#include <kgdb.h>
wdenkaffae2b2002-08-17 09:36:01 +000038#include <asm/processor.h>
wdenk3c74e322004-02-22 23:46:08 +000039#include <asm/m8260_pci.h>
wdenkaffae2b2002-08-17 09:36:01 +000040
wdenkaffae2b2002-08-17 09:36:01 +000041/* Returns 0 if exception not found and fixup otherwise. */
42extern unsigned long search_exception_table(unsigned long);
43
44/* THIS NEEDS CHANGING to use the board info structure.
45*/
46#define END_OF_MEM 0x02000000
47
48/*
49 * Trap & Exception support
50 */
51
52void
53print_backtrace(unsigned long *sp)
54{
55 int cnt = 0;
56 unsigned long i;
57
wdenk4b9206e2004-03-23 22:14:11 +000058 puts ("Call backtrace: ");
wdenkaffae2b2002-08-17 09:36:01 +000059 while (sp) {
60 if ((uint)sp > END_OF_MEM)
61 break;
62
63 i = sp[1];
64 if (cnt++ % 7 == 0)
wdenk4b9206e2004-03-23 22:14:11 +000065 putc ('\n');
wdenkaffae2b2002-08-17 09:36:01 +000066 printf("%08lX ", i);
67 if (cnt > 32) break;
68 sp = (unsigned long *)*sp;
69 }
wdenk4b9206e2004-03-23 22:14:11 +000070 putc ('\n');
wdenkaffae2b2002-08-17 09:36:01 +000071}
72
73void show_regs(struct pt_regs * regs)
74{
75 int i;
76
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);
84
wdenk4b9206e2004-03-23 22:14:11 +000085 putc ('\n');
wdenkaffae2b2002-08-17 09:36:01 +000086 for (i = 0; i < 32; i++) {
wdenk3c74e322004-02-22 23:46:08 +000087 if ((i % 8) == 0) {
wdenkaffae2b2002-08-17 09:36:01 +000088 printf("GPR%02d: ", i);
89 }
90
91 printf("%08lX ", regs->gpr[i]);
wdenk3c74e322004-02-22 23:46:08 +000092 if ((i % 8) == 7) {
wdenk4b9206e2004-03-23 22:14:11 +000093 putc ('\n');
wdenkaffae2b2002-08-17 09:36:01 +000094 }
95 }
96}
97
98
99void
100_exception(int signr, struct pt_regs *regs)
101{
102 show_regs(regs);
103 print_backtrace((unsigned long *)regs->gpr[1]);
104 panic("Exception in kernel pc %lx signal %d",regs->nip,signr);
105}
106
wdenk3c74e322004-02-22 23:46:08 +0000107#ifdef CONFIG_PCI
108void dump_pci (void)
109{
110
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +0200111 volatile immap_t *immap = (immap_t *) CONFIG_SYS_IMMR;
wdenk3c74e322004-02-22 23:46:08 +0000112
113 printf ("PCI: err status %x err mask %x err ctrl %x\n",
114 le32_to_cpu (immap->im_pci.pci_esr),
115 le32_to_cpu (immap->im_pci.pci_emr),
116 le32_to_cpu (immap->im_pci.pci_ecr));
117 printf (" error address %x error data %x ctrl %x\n",
118 le32_to_cpu (immap->im_pci.pci_eacr),
119 le32_to_cpu (immap->im_pci.pci_edcr),
120 le32_to_cpu (immap->im_pci.pci_eccr));
121
122}
123#endif
124
wdenkaffae2b2002-08-17 09:36:01 +0000125void
126MachineCheckException(struct pt_regs *regs)
127{
128 unsigned long fixup;
129
130 /* Probing PCI using config cycles cause this exception
131 * when a device is not present. Catch it and return to
132 * the PCI exception handler.
133 */
wdenk3c74e322004-02-22 23:46:08 +0000134#ifdef CONFIG_PCI
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +0200135 volatile immap_t *immap = (immap_t *)CONFIG_SYS_IMMR;
wdenk3c74e322004-02-22 23:46:08 +0000136#ifdef DEBUG
137 dump_pci();
138#endif
139 /* clear the error in the error status register */
wdenk6fb6af62004-03-23 23:20:24 +0000140 if(immap->im_pci.pci_esr & cpu_to_le32(PCI_ERROR_PCI_NO_RSP)) {
wdenk3c74e322004-02-22 23:46:08 +0000141 immap->im_pci.pci_esr = cpu_to_le32(PCI_ERROR_PCI_NO_RSP);
142 return;
143 }
144#endif
wdenkaffae2b2002-08-17 09:36:01 +0000145 if ((fixup = search_exception_table(regs->nip)) != 0) {
146 regs->nip = fixup;
147 return;
148 }
149
Jon Loeliger44312832007-07-09 19:06:00 -0500150#if defined(CONFIG_CMD_KGDB)
wdenkaffae2b2002-08-17 09:36:01 +0000151 if (debugger_exception_handler && (*debugger_exception_handler)(regs))
152 return;
153#endif
154
wdenk4b9206e2004-03-23 22:14:11 +0000155 puts ("Machine check in kernel mode.\n"
156 "Caused by (from msr): ");
wdenkaffae2b2002-08-17 09:36:01 +0000157 printf("regs %p ",regs);
wdenk63e73c92004-02-23 22:22:28 +0000158 switch( regs->msr & 0x000F0000) {
159 case (0x80000000>>12):
wdenk4b9206e2004-03-23 22:14:11 +0000160 puts ("Machine check signal - probably due to mm fault\n"
wdenkaffae2b2002-08-17 09:36:01 +0000161 "with mmu off\n");
162 break;
wdenk63e73c92004-02-23 22:22:28 +0000163 case (0x80000000>>13):
wdenk4b9206e2004-03-23 22:14:11 +0000164 puts ("Transfer error ack signal\n");
wdenkaffae2b2002-08-17 09:36:01 +0000165 break;
wdenk63e73c92004-02-23 22:22:28 +0000166 case (0x80000000>>14):
wdenk4b9206e2004-03-23 22:14:11 +0000167 puts ("Data parity signal\n");
wdenkaffae2b2002-08-17 09:36:01 +0000168 break;
wdenk63e73c92004-02-23 22:22:28 +0000169 case (0x80000000>>15):
wdenk4b9206e2004-03-23 22:14:11 +0000170 puts ("Address parity signal\n");
wdenkaffae2b2002-08-17 09:36:01 +0000171 break;
172 default:
wdenk4b9206e2004-03-23 22:14:11 +0000173 puts ("Unknown values in msr\n");
wdenkaffae2b2002-08-17 09:36:01 +0000174 }
175 show_regs(regs);
176 print_backtrace((unsigned long *)regs->gpr[1]);
wdenk3c74e322004-02-22 23:46:08 +0000177#ifdef CONFIG_PCI
178 dump_pci();
179#endif
wdenkaffae2b2002-08-17 09:36:01 +0000180 panic("machine check");
181}
182
183void
184AlignmentException(struct pt_regs *regs)
185{
Jon Loeliger44312832007-07-09 19:06:00 -0500186#if defined(CONFIG_CMD_KGDB)
wdenkaffae2b2002-08-17 09:36:01 +0000187 if (debugger_exception_handler && (*debugger_exception_handler)(regs))
188 return;
189#endif
190 show_regs(regs);
191 print_backtrace((unsigned long *)regs->gpr[1]);
192 panic("Alignment Exception");
193}
194
195void
196ProgramCheckException(struct pt_regs *regs)
197{
Jon Loeliger44312832007-07-09 19:06:00 -0500198#if defined(CONFIG_CMD_KGDB)
wdenkaffae2b2002-08-17 09:36:01 +0000199 if (debugger_exception_handler && (*debugger_exception_handler)(regs))
200 return;
201#endif
202 show_regs(regs);
203 print_backtrace((unsigned long *)regs->gpr[1]);
204 panic("Program Check Exception");
205}
206
207void
208SoftEmuException(struct pt_regs *regs)
209{
Jon Loeliger44312832007-07-09 19:06:00 -0500210#if defined(CONFIG_CMD_KGDB)
wdenkaffae2b2002-08-17 09:36:01 +0000211 if (debugger_exception_handler && (*debugger_exception_handler)(regs))
212 return;
213#endif
214 show_regs(regs);
215 print_backtrace((unsigned long *)regs->gpr[1]);
216 panic("Software Emulation Exception");
217}
218
219
220void
221UnknownException(struct pt_regs *regs)
222{
Jon Loeliger44312832007-07-09 19:06:00 -0500223#if defined(CONFIG_CMD_KGDB)
wdenkaffae2b2002-08-17 09:36:01 +0000224 if (debugger_exception_handler && (*debugger_exception_handler)(regs))
225 return;
226#endif
227 printf("Bad trap at PC: %lx, SR: %lx, vector=%lx\n",
228 regs->nip, regs->msr, regs->trap);
229 _exception(0, regs);
230}
231
Jon Loeliger44312832007-07-09 19:06:00 -0500232#if defined(CONFIG_CMD_BEDBUG)
wdenkaffae2b2002-08-17 09:36:01 +0000233extern void do_bedbug_breakpoint(struct pt_regs *);
234#endif
235
236void
237DebugException(struct pt_regs *regs)
238{
239
240 printf("Debugger trap at @ %lx\n", regs->nip );
241 show_regs(regs);
Jon Loeliger44312832007-07-09 19:06:00 -0500242#if defined(CONFIG_CMD_BEDBUG)
wdenkaffae2b2002-08-17 09:36:01 +0000243 do_bedbug_breakpoint( regs );
244#endif
245}
246
247/* Probe an address by reading. If not present, return -1, otherwise
248 * return 0.
249 */
250int
251addr_probe(uint *addr)
252{
253#if 0
254 int retval;
255
256 __asm__ __volatile__( \
257 "1: lwz %0,0(%1)\n" \
258 " eieio\n" \
259 " li %0,0\n" \
260 "2:\n" \
261 ".section .fixup,\"ax\"\n" \
262 "3: li %0,-1\n" \
263 " b 2b\n" \
264 ".section __ex_table,\"a\"\n" \
265 " .align 2\n" \
266 " .long 1b,3b\n" \
267 ".text" \
268 : "=r" (retval) : "r"(addr));
269
270 return (retval);
271#endif
272 return 0;
273}