2 * (C) Copyright 2000 - 2007
3 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
5 * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
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.
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.
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,
22 * Derived from the MPC83xx code.
26 * This file handles the architecture-dependent parts of hardware
32 #include <asm/processor.h>
34 DECLARE_GLOBAL_DATA_PTR;
36 extern unsigned long search_exception_table(unsigned long);
39 * End of addressable memory. This may be less than the actual
40 * amount of memory on the system if we're unable to keep all
41 * the memory mapped in.
43 extern ulong get_effective_memsize(void);
44 #define END_OF_MEM (gd->bd->bi_memstart + get_effective_memsize())
47 * Trap & Exception support
51 print_backtrace (unsigned long *sp)
56 puts ("Call backtrace: ");
58 if ((uint)sp > END_OF_MEM)
66 sp = (unsigned long *) *sp;
71 void show_regs (struct pt_regs * regs)
75 printf ("NIP: %08lX XER: %08lX LR: %08lX REGS: %p TRAP: %04lx DAR: %08lX\n",
76 regs->nip, regs->xer, regs->link, regs, regs->trap, regs->dar);
77 printf ("MSR: %08lx EE: %01x PR: %01x FP: %01x ME: %01x IR/DR: %01x%01x\n",
78 regs->msr, regs->msr & MSR_EE ? 1 : 0, regs->msr & MSR_PR ? 1 : 0,
79 regs->msr & MSR_FP ? 1 : 0,regs->msr & MSR_ME ? 1 : 0,
80 regs->msr & MSR_IR ? 1 : 0,
81 regs->msr & MSR_DR ? 1 : 0);
84 for (i = 0; i < 32; i++) {
86 printf ("GPR%02d: ", i);
89 printf ("%08lX ", regs->gpr[i]);
98 _exception (int signr, struct pt_regs *regs)
101 print_backtrace ((unsigned long *)regs->gpr[1]);
102 panic ("Exception at pc %lx signal %d", regs->nip,signr);
107 MachineCheckException (struct pt_regs *regs)
111 if ((fixup = search_exception_table (regs->nip)) != 0) {
116 #ifdef CONFIG_CMD_KGDB
117 if (debugger_exception_handler && (*debugger_exception_handler)(regs))
121 puts ("Machine check.\nCaused by (from msr): ");
122 printf ("regs %p ",regs);
123 switch (regs->msr & 0x00FF0000) {
124 case (0x80000000 >> 10):
125 puts ("Instruction cache parity signal\n");
127 case (0x80000000 >> 11):
128 puts ("Data cache parity signal\n");
130 case (0x80000000 >> 12):
131 puts ("Machine check signal\n");
133 case (0x80000000 >> 13):
134 puts ("Transfer error ack signal\n");
136 case (0x80000000 >> 14):
137 puts ("Data parity signal\n");
139 case (0x80000000 >> 15):
140 puts ("Address parity signal\n");
143 puts ("Unknown values in msr\n");
146 print_backtrace ((unsigned long *)regs->gpr[1]);
148 panic ("machine check");
152 AlignmentException (struct pt_regs *regs)
154 #ifdef CONFIG_CMD_KGDB
155 if (debugger_exception_handler && (*debugger_exception_handler)(regs))
159 print_backtrace ((unsigned long *)regs->gpr[1]);
160 panic ("Alignment Exception");
164 ProgramCheckException (struct pt_regs *regs)
166 #ifdef CONFIG_CMD_KGDB
167 if (debugger_exception_handler && (*debugger_exception_handler)(regs))
171 print_backtrace ((unsigned long *)regs->gpr[1]);
172 panic ("Program Check Exception");
176 SoftEmuException (struct pt_regs *regs)
178 #ifdef CONFIG_CMD_KGDB
179 if (debugger_exception_handler && (*debugger_exception_handler)(regs))
183 print_backtrace ((unsigned long *)regs->gpr[1]);
184 panic ("Software Emulation Exception");
189 UnknownException (struct pt_regs *regs)
191 #ifdef CONFIG_CMD_KGDB
192 if (debugger_exception_handler && (*debugger_exception_handler)(regs))
195 printf ("Bad trap at PC: %lx, SR: %lx, vector=%lx\n",
196 regs->nip, regs->msr, regs->trap);
197 _exception (0, regs);
200 #ifdef CONFIG_CMD_BEDBUG
201 extern void do_bedbug_breakpoint (struct pt_regs *);
205 DebugException (struct pt_regs *regs)
207 printf ("Debugger trap at @ %lx\n", regs->nip );
209 #ifdef CONFIG_CMD_BEDBUG
210 do_bedbug_breakpoint (regs);