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-rw-r--r--arch/powerpc/cpu/mpc86xx/traps.c233
1 files changed, 233 insertions, 0 deletions
diff --git a/arch/powerpc/cpu/mpc86xx/traps.c b/arch/powerpc/cpu/mpc86xx/traps.c
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+/*
+ * 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)
+ *
+ * (C) Copyright 2000
+ * 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>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+/* Returns 0 if exception not found and fixup otherwise. */
+extern unsigned long search_exception_table(unsigned long);
+
+/*
+ * End of addressable memory. This may be less than the actual
+ * amount of memory on the system if we're unable to keep all
+ * the memory mapped in.
+ */
+extern ulong get_effective_memsize(void);
+#define END_OF_MEM (gd->bd->bi_memstart + get_effective_memsize())
+
+/*
+ * 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);
+ switch ( regs->msr & 0x001F0000) {
+ case (0x80000000>>11):
+ printf("MSS error. MSSSR0: %08x\n", mfspr(SPRN_MSSSR0));
+ break;
+ 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)
+{
+ unsigned char *p = regs ? (unsigned char *)(regs->nip) : NULL;
+ int i, j;
+
+#if defined(CONFIG_CMD_KGDB)
+ if (debugger_exception_handler && (*debugger_exception_handler) (regs))
+ return;
+#endif
+ show_regs(regs);
+
+ p = (unsigned char *)((unsigned long)p & 0xFFFFFFE0);
+ p -= 32;
+ for (i = 0; i < 256; i += 16) {
+ printf("%08x: ", (unsigned int)p + i);
+ for (j = 0; j < 16; j++) {
+ printf("%02x ", p[i + j]);
+ }
+ printf("\n");
+ }
+
+ 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("UnknownException regs@%lx\n", (ulong)regs);
+ printf("Bad trap at PC: %lx, SR: %lx, vector=%lx\n",
+ regs->nip, regs->msr, regs->trap);
+ _exception(0, regs);
+}
+
+/*
+ * Probe an address by reading.
+ * If not present, return -1,
+ * otherwise return 0.
+ */
+int
+addr_probe(uint *addr)
+{
+ return 0;
+}