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/*
* linux/arch/ppc/kernel/traps.c
*
* Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
*
* Modified by Cort Dougan (cort@cs.nmt.edu)
* and Paul Mackerras (paulus@cs.anu.edu.au)
* fixed Machine Check Reasons by Reinhard Meyer (r.meyer@emk-elektronik.de)
*
* (C) Copyright 2000-2003
* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
*
* See file CREDITS for list of people who contributed to this
* project.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*/
/*
* This file handles the architecture-dependent parts of hardware exceptions
*/
#include <common.h>
#include <command.h>
#include <kgdb.h>
#include <asm/processor.h>
/* Returns 0 if exception not found and fixup otherwise. */
extern unsigned long search_exception_table (unsigned long);
/* THIS NEEDS CHANGING to use the board info structure.
*/
#define END_OF_MEM 0x02000000
/*
* Trap & Exception support
*/
void print_backtrace (unsigned long *sp)
{
int cnt = 0;
unsigned long i;
printf ("Call backtrace: ");
while (sp) {
if ((uint) sp > END_OF_MEM)
break;
i = sp[1];
if (cnt++ % 7 == 0)
printf ("\n");
printf ("%08lX ", i);
if (cnt > 32)
break;
sp = (unsigned long *) *sp;
}
printf ("\n");
}
void show_regs (struct pt_regs *regs)
{
int i;
printf ("NIP: %08lX XER: %08lX LR: %08lX REGS: %p TRAP: %04lx DAR: %08lX\n",
regs->nip, regs->xer, regs->link, regs, regs->trap, regs->dar);
printf ("MSR: %08lx EE: %01x PR: %01x FP: %01x ME: %01x IR/DR: %01x%01x\n",
regs->msr,
regs->msr & MSR_EE ? 1 : 0, regs->msr & MSR_PR ? 1 : 0,
regs->msr & MSR_FP ? 1 : 0, regs->msr & MSR_ME ? 1 : 0,
regs->msr & MSR_IR ? 1 : 0, regs->msr & MSR_DR ? 1 : 0);
printf ("\n");
for (i = 0; i < 32; i++) {
if ((i % 8) == 0) {
printf ("GPR%02d: ", i);
}
printf ("%08lX ", regs->gpr[i]);
if ((i % 8) == 7) {
printf ("\n");
}
}
}
void _exception (int signr, struct pt_regs *regs)
{
show_regs (regs);
print_backtrace ((unsigned long *) regs->gpr[1]);
panic ("Exception in kernel pc %lx signal %d", regs->nip, signr);
}
void MachineCheckException (struct pt_regs *regs)
{
unsigned long fixup;
/* Probing PCI using config cycles cause this exception
* when a device is not present. Catch it and return to
* the PCI exception handler.
*/
if ((fixup = search_exception_table (regs->nip)) != 0) {
regs->nip = fixup;
return;
}
#if defined(CONFIG_CMD_KGDB)
if (debugger_exception_handler
&& (*debugger_exception_handler) (regs))
return;
#endif
printf ("Machine check in kernel mode.\n");
printf ("Caused by (from msr): ");
printf ("regs %p ", regs);
/* refer to 603e Manual (MPC603EUM/AD), chapter 4.5.2.1 */
switch (regs->msr & 0x000F0000) {
case (0x80000000 >> 12):
printf ("Machine check signal - probably due to mm fault\n"
"with mmu off\n");
break;
case (0x80000000 >> 13):
printf ("Transfer error ack signal\n");
break;
case (0x80000000 >> 14):
printf ("Data parity signal\n");
break;
case (0x80000000 >> 15):
printf ("Address parity signal\n");
break;
default:
printf ("Unknown values in msr\n");
}
show_regs (regs);
print_backtrace ((unsigned long *) regs->gpr[1]);
panic ("machine check");
}
void AlignmentException (struct pt_regs *regs)
{
#if defined(CONFIG_CMD_KGDB)
if (debugger_exception_handler
&& (*debugger_exception_handler) (regs))
return;
#endif
show_regs (regs);
print_backtrace ((unsigned long *) regs->gpr[1]);
panic ("Alignment Exception");
}
void ProgramCheckException (struct pt_regs *regs)
{
#if defined(CONFIG_CMD_KGDB)
if (debugger_exception_handler
&& (*debugger_exception_handler) (regs))
return;
#endif
show_regs (regs);
print_backtrace ((unsigned long *) regs->gpr[1]);
panic ("Program Check Exception");
}
void SoftEmuException (struct pt_regs *regs)
{
#if defined(CONFIG_CMD_KGDB)
if (debugger_exception_handler
&& (*debugger_exception_handler) (regs))
return;
#endif
show_regs (regs);
print_backtrace ((unsigned long *) regs->gpr[1]);
panic ("Software Emulation Exception");
}
void UnknownException (struct pt_regs *regs)
{
#if defined(CONFIG_CMD_KGDB)
if (debugger_exception_handler
&& (*debugger_exception_handler) (regs))
return;
#endif
printf ("Bad trap at PC: %lx, SR: %lx, vector=%lx\n",
regs->nip, regs->msr, regs->trap);
_exception (0, regs);
}
#if defined(CONFIG_CMD_BEDBUG)
extern void do_bedbug_breakpoint (struct pt_regs *);
#endif
void DebugException (struct pt_regs *regs)
{
printf ("Debugger trap at @ %lx\n", regs->nip);
show_regs (regs);
#if defined(CONFIG_CMD_BEDBUG)
do_bedbug_breakpoint (regs);
#endif
}
/* Probe an address by reading. If not present, return -1, otherwise
* return 0.
*/
int addr_probe (uint * addr)
{
#if 0
int retval;
__asm__ __volatile__ ("1: lwz %0,0(%1)\n"
" eieio\n"
" li %0,0\n"
"2:\n"
".section .fixup,\"ax\"\n"
"3: li %0,-1\n"
" b 2b\n"
".section __ex_table,\"a\"\n"
" .align 2\n"
" .long 1b,3b\n"
".text":"=r" (retval):"r" (addr));
return (retval);
#endif
return 0;
}
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