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-rw-r--r--cpu/mpc8220/traps.c239
1 files changed, 239 insertions, 0 deletions
diff --git a/cpu/mpc8220/traps.c b/cpu/mpc8220/traps.c
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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 <asm/processor.h>
+
+#if (CONFIG_COMMANDS & CFG_CMD_KGDB)
+int (*debugger_exception_handler) (struct pt_regs *) = 0;
+#endif
+
+/* 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 (CONFIG_COMMANDS & CFG_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 (CONFIG_COMMANDS & CFG_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 (CONFIG_COMMANDS & CFG_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 (CONFIG_COMMANDS & CFG_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 (CONFIG_COMMANDS & CFG_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 (CONFIG_COMMANDS & CFG_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 (CONFIG_COMMANDS & CFG_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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