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Eran Libertyf046ccd2005-07-28 10:08:46 -05001/*
Timur Tabie857a5b2006-11-28 12:09:35 -06002 * (C) Copyright 2000
3 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
4 *
5 * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
Eran Libertyf046ccd2005-07-28 10:08:46 -05006 *
7 * This program is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License as
9 * published by the Free Software Foundation; either version 2 of
10 * the License, or (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
20 * MA 02111-1307 USA
Eran Libertyf046ccd2005-07-28 10:08:46 -050021 */
22
23/*
24 * This file handles the architecture-dependent parts of hardware
25 * exceptions
26 */
27
28#include <common.h>
29#include <command.h>
30#include <asm/processor.h>
31#include <asm/mpc8349_pci.h>
32
Wolfgang Denkd87080b2006-03-31 18:32:53 +020033DECLARE_GLOBAL_DATA_PTR;
34
Eran Libertyf046ccd2005-07-28 10:08:46 -050035/* Returns 0 if exception not found and fixup otherwise. */
36extern unsigned long search_exception_table(unsigned long);
37
38#define END_OF_MEM (gd->bd->bi_memstart + gd->bd->bi_memsize)
39
40/*
41 * Trap & Exception support
42 */
43
44void
45print_backtrace(unsigned long *sp)
46{
Eran Libertyf046ccd2005-07-28 10:08:46 -050047 int cnt = 0;
48 unsigned long i;
49
50 puts ("Call backtrace: ");
51 while (sp) {
52 if ((uint)sp > END_OF_MEM)
53 break;
54
55 i = sp[1];
56 if (cnt++ % 7 == 0)
57 putc ('\n');
58 printf("%08lX ", i);
59 if (cnt > 32) break;
60 sp = (unsigned long *)*sp;
61 }
62 putc ('\n');
63}
64
65void show_regs(struct pt_regs * regs)
66{
67 int i;
68
69 printf("NIP: %08lX XER: %08lX LR: %08lX REGS: %p TRAP: %04lx DAR: %08lX\n",
70 regs->nip, regs->xer, regs->link, regs, regs->trap, regs->dar);
71 printf("MSR: %08lx EE: %01x PR: %01x FP: %01x ME: %01x IR/DR: %01x%01x\n",
72 regs->msr, regs->msr&MSR_EE ? 1 : 0, regs->msr&MSR_PR ? 1 : 0,
73 regs->msr & MSR_FP ? 1 : 0,regs->msr&MSR_ME ? 1 : 0,
74 regs->msr&MSR_IR ? 1 : 0,
75 regs->msr&MSR_DR ? 1 : 0);
76
77 putc ('\n');
78 for (i = 0; i < 32; i++) {
79 if ((i % 8) == 0) {
80 printf("GPR%02d: ", i);
81 }
82
83 printf("%08lX ", regs->gpr[i]);
84 if ((i % 8) == 7) {
85 putc ('\n');
86 }
87 }
88}
89
90
91void
92_exception(int signr, struct pt_regs *regs)
93{
94 show_regs(regs);
95 print_backtrace((unsigned long *)regs->gpr[1]);
96 panic("Exception in kernel pc %lx signal %d",regs->nip,signr);
97}
98
99#ifdef CONFIG_PCI
100void dump_pci (void)
101{
102/*
103 volatile immap_t *immap = (immap_t *) CFG_IMMR;
104 printf ("PCI: err status %x err mask %x err ctrl %x\n",
105 le32_to_cpu (immap->im_pci.pci_esr),
106 le32_to_cpu (immap->im_pci.pci_emr),
107 le32_to_cpu (immap->im_pci.pci_ecr));
108 printf (" error address %x error data %x ctrl %x\n",
109 le32_to_cpu (immap->im_pci.pci_eacr),
110 le32_to_cpu (immap->im_pci.pci_edcr),
111 le32_to_cpu (immap->im_pci.pci_eccr));
112*/
113}
114#endif
115
116void
117MachineCheckException(struct pt_regs *regs)
118{
119 unsigned long fixup;
120
121 /* Probing PCI using config cycles cause this exception
122 * when a device is not present. Catch it and return to
123 * the PCI exception handler.
124 */
125#ifdef CONFIG_PCI
126#if 0
127 volatile immap_t *immap = (immap_t *)CFG_IMMR;
128#ifdef DEBUG
129 dump_pci();
130#endif
131 /* clear the error in the error status register */
132 if(immap->im_pci.pci_esr & cpu_to_le32(PCI_ERROR_PCI_NO_RSP)) {
133 immap->im_pci.pci_esr = cpu_to_le32(PCI_ERROR_PCI_NO_RSP);
134 return;
135 }
136#endif
137#endif /* CONFIG_PCI */
138 if ((fixup = search_exception_table(regs->nip)) != 0) {
139 regs->nip = fixup;
140 return;
141 }
142
Jon Loeliger44312832007-07-09 19:06:00 -0500143#if defined(CONFIG_CMD_KGDB)
Eran Libertyf046ccd2005-07-28 10:08:46 -0500144 if (debugger_exception_handler && (*debugger_exception_handler)(regs))
145 return;
146#endif
147
148 puts ("Machine check in kernel mode.\n"
149 "Caused by (from msr): ");
150 printf("regs %p ",regs);
151 switch( regs->msr & 0x000F0000) {
152 case (0x80000000>>12):
153 puts ("Machine check signal - probably due to mm fault\n"
154 "with mmu off\n");
155 break;
156 case (0x80000000>>13):
157 puts ("Transfer error ack signal\n");
158 break;
159 case (0x80000000>>14):
160 puts ("Data parity signal\n");
161 break;
162 case (0x80000000>>15):
163 puts ("Address parity signal\n");
164 break;
165 default:
166 puts ("Unknown values in msr\n");
167 }
168 show_regs(regs);
169 print_backtrace((unsigned long *)regs->gpr[1]);
170#ifdef CONFIG_PCI
171 dump_pci();
172#endif
173 panic("machine check");
174}
175
176void
177AlignmentException(struct pt_regs *regs)
178{
Jon Loeliger44312832007-07-09 19:06:00 -0500179#if defined(CONFIG_CMD_KGDB)
Eran Libertyf046ccd2005-07-28 10:08:46 -0500180 if (debugger_exception_handler && (*debugger_exception_handler)(regs))
181 return;
182#endif
183 show_regs(regs);
184 print_backtrace((unsigned long *)regs->gpr[1]);
185 panic("Alignment Exception");
186}
187
188void
189ProgramCheckException(struct pt_regs *regs)
190{
Jon Loeliger44312832007-07-09 19:06:00 -0500191#if defined(CONFIG_CMD_KGDB)
Eran Libertyf046ccd2005-07-28 10:08:46 -0500192 if (debugger_exception_handler && (*debugger_exception_handler)(regs))
193 return;
194#endif
195 show_regs(regs);
196 print_backtrace((unsigned long *)regs->gpr[1]);
197 panic("Program Check Exception");
198}
199
200void
201SoftEmuException(struct pt_regs *regs)
202{
Jon Loeliger44312832007-07-09 19:06:00 -0500203#if defined(CONFIG_CMD_KGDB)
Eran Libertyf046ccd2005-07-28 10:08:46 -0500204 if (debugger_exception_handler && (*debugger_exception_handler)(regs))
205 return;
206#endif
207 show_regs(regs);
208 print_backtrace((unsigned long *)regs->gpr[1]);
209 panic("Software Emulation Exception");
210}
211
212
213void
214UnknownException(struct pt_regs *regs)
215{
Jon Loeliger44312832007-07-09 19:06:00 -0500216#if defined(CONFIG_CMD_KGDB)
Eran Libertyf046ccd2005-07-28 10:08:46 -0500217 if (debugger_exception_handler && (*debugger_exception_handler)(regs))
218 return;
219#endif
220 printf("Bad trap at PC: %lx, SR: %lx, vector=%lx\n",
221 regs->nip, regs->msr, regs->trap);
222 _exception(0, regs);
223}
224
Jon Loeliger44312832007-07-09 19:06:00 -0500225#if defined(CONFIG_CMD_BEDBUG)
Eran Libertyf046ccd2005-07-28 10:08:46 -0500226extern void do_bedbug_breakpoint(struct pt_regs *);
227#endif
228
229void
230DebugException(struct pt_regs *regs)
231{
232 printf("Debugger trap at @ %lx\n", regs->nip );
233 show_regs(regs);
Jon Loeliger44312832007-07-09 19:06:00 -0500234#if defined(CONFIG_CMD_BEDBUG)
Eran Libertyf046ccd2005-07-28 10:08:46 -0500235 do_bedbug_breakpoint( regs );
236#endif
237}
238
239/* Probe an address by reading. If not present, return -1, otherwise
240 * return 0.
241 */
242int
243addr_probe(uint *addr)
244{
245#if 0
246 int retval;
247
248 __asm__ __volatile__( \
249 "1: lwz %0,0(%1)\n" \
250 " eieio\n" \
251 " li %0,0\n" \
252 "2:\n" \
253 ".section .fixup,\"ax\"\n" \
254 "3: li %0,-1\n" \
255 " b 2b\n" \
256 ".section __ex_table,\"a\"\n" \
257 " .align 2\n" \
258 " .long 1b,3b\n" \
259 ".text" \
260 : "=r" (retval) : "r"(addr));
261
262 return (retval);
263#endif
264 return 0;
265}