+++ /dev/null
-/*
- * 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)
- *
- * (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>
-#include <asm/m8260_pci.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;
-
- puts ("Call backtrace: ");
- while (sp) {
- if ((uint)sp > END_OF_MEM)
- break;
-
- i = sp[1];
- if (cnt++ % 7 == 0)
- putc ('\n');
- printf("%08lX ", i);
- if (cnt > 32) break;
- sp = (unsigned long *)*sp;
- }
- putc ('\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);
-
- putc ('\n');
- for (i = 0; i < 32; i++) {
- if ((i % 8) == 0) {
- printf("GPR%02d: ", i);
- }
-
- printf("%08lX ", regs->gpr[i]);
- if ((i % 8) == 7) {
- putc ('\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);
-}
-
-#ifdef CONFIG_PCI
-void dump_pci (void)
-{
-
- volatile immap_t *immap = (immap_t *) CONFIG_SYS_IMMR;
-
- printf ("PCI: err status %x err mask %x err ctrl %x\n",
- le32_to_cpu (immap->im_pci.pci_esr),
- le32_to_cpu (immap->im_pci.pci_emr),
- le32_to_cpu (immap->im_pci.pci_ecr));
- printf (" error address %x error data %x ctrl %x\n",
- le32_to_cpu (immap->im_pci.pci_eacr),
- le32_to_cpu (immap->im_pci.pci_edcr),
- le32_to_cpu (immap->im_pci.pci_eccr));
-
-}
-#endif
-
-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.
- */
-#ifdef CONFIG_PCI
- volatile immap_t *immap = (immap_t *)CONFIG_SYS_IMMR;
-#ifdef DEBUG
- dump_pci();
-#endif
- /* clear the error in the error status register */
- if(immap->im_pci.pci_esr & cpu_to_le32(PCI_ERROR_PCI_NO_RSP)) {
- immap->im_pci.pci_esr = cpu_to_le32(PCI_ERROR_PCI_NO_RSP);
- return;
- }
-#endif
- 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
-
- puts ("Machine check in kernel mode.\n"
- "Caused by (from msr): ");
- printf("regs %p ",regs);
- switch( regs->msr & 0x000F0000) {
- case (0x80000000>>12):
- puts ("Machine check signal - probably due to mm fault\n"
- "with mmu off\n");
- break;
- case (0x80000000>>13):
- puts ("Transfer error ack signal\n");
- break;
- case (0x80000000>>14):
- puts ("Data parity signal\n");
- break;
- case (0x80000000>>15):
- puts ("Address parity signal\n");
- break;
- default:
- puts ("Unknown values in msr\n");
- }
- show_regs(regs);
- print_backtrace((unsigned long *)regs->gpr[1]);
-#ifdef CONFIG_PCI
- dump_pci();
-#endif
- 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;
-}
projects / u-boot / blobdiff