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61a21e980a
From: Ed Swarthout <Ed.Swarthout@freescale.com> Support external interrupts from platform to eliminate system hangs. Define CONFIG_INTERRUPTS board configure option to enable. Enable ecm, ddr, lbc, and pci/pcie error interrupts in PIC. Remove extra cpu initialization redundant with hardware initialization. Whitespace cleanup. Define and use _START_OFFSET consistent with other processors using ppc_asm.tmpl Move additional code from .text to boot page to make room for exception vectors at start of image. Handle Machine Check, External and Critical exceptions. Fix e500 machine check error determination in traps.c TEXT_BASE can now be 0xfffc_0000 - which cuts binary image in half. Signed-off-by: Ed Swarthout <Ed.Swarthout@freescale.com> Acked-by: Andy Fleming <afleming@freescale.com>
334 lines
7.7 KiB
C
334 lines
7.7 KiB
C
/*
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* linux/arch/ppc/kernel/traps.c
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*
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* Copyright 2007 Freescale Semiconductor.
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* Copyright (C) 2003 Motorola
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* Modified by Xianghua Xiao(x.xiao@motorola.com)
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*
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* Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
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*
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* Modified by Cort Dougan (cort@cs.nmt.edu)
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* and Paul Mackerras (paulus@cs.anu.edu.au)
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*
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* (C) Copyright 2000
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* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
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*
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* See file CREDITS for list of people who contributed to this
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* project.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*/
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/*
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* This file handles the architecture-dependent parts of hardware exceptions
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*/
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#include <common.h>
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#include <command.h>
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#include <asm/processor.h>
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DECLARE_GLOBAL_DATA_PTR;
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#if defined(CONFIG_CMD_KGDB)
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int (*debugger_exception_handler)(struct pt_regs *) = 0;
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#endif
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/* Returns 0 if exception not found and fixup otherwise. */
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extern unsigned long search_exception_table(unsigned long);
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/*
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* End of memory as shown by board info and determined by DDR setup.
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*/
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#define END_OF_MEM (gd->bd->bi_memstart + gd->bd->bi_memsize)
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static __inline__ void set_tsr(unsigned long val)
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{
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asm volatile("mtspr 0x150, %0" : : "r" (val));
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}
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static __inline__ unsigned long get_esr(void)
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{
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unsigned long val;
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asm volatile("mfspr %0, 0x03e" : "=r" (val) :);
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return val;
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}
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#define ESR_MCI 0x80000000
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#define ESR_PIL 0x08000000
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#define ESR_PPR 0x04000000
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#define ESR_PTR 0x02000000
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#define ESR_DST 0x00800000
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#define ESR_DIZ 0x00400000
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#define ESR_U0F 0x00008000
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#if defined(CONFIG_CMD_BEDBUG)
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extern void do_bedbug_breakpoint(struct pt_regs *);
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#endif
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/*
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* Trap & Exception support
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*/
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void
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print_backtrace(unsigned long *sp)
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{
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int cnt = 0;
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unsigned long i;
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printf("Call backtrace: ");
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while (sp) {
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if ((uint)sp > END_OF_MEM)
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break;
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i = sp[1];
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if (cnt++ % 7 == 0)
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printf("\n");
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printf("%08lX ", i);
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if (cnt > 32) break;
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sp = (unsigned long *)*sp;
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}
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printf("\n");
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}
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void show_regs(struct pt_regs * regs)
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{
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int i;
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printf("NIP: %08lX XER: %08lX LR: %08lX REGS: %p TRAP: %04lx DAR: %08lX\n",
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regs->nip, regs->xer, regs->link, regs, regs->trap, regs->dar);
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printf("MSR: %08lx EE: %01x PR: %01x FP: %01x ME: %01x IR/DR: %01x%01x\n",
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regs->msr, regs->msr&MSR_EE ? 1 : 0, regs->msr&MSR_PR ? 1 : 0,
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regs->msr & MSR_FP ? 1 : 0,regs->msr&MSR_ME ? 1 : 0,
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regs->msr&MSR_IR ? 1 : 0,
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regs->msr&MSR_DR ? 1 : 0);
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printf("\n");
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for (i = 0; i < 32; i++) {
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if ((i % 8) == 0)
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{
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printf("GPR%02d: ", i);
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}
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printf("%08lX ", regs->gpr[i]);
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if ((i % 8) == 7)
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{
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printf("\n");
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}
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}
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}
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void
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_exception(int signr, struct pt_regs *regs)
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{
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show_regs(regs);
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print_backtrace((unsigned long *)regs->gpr[1]);
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panic("Exception in kernel pc %lx signal %d",regs->nip,signr);
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}
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void
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CritcalInputException(struct pt_regs *regs)
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{
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panic("Critical Input Exception");
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}
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int machinecheck_count = 0;
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int machinecheck_error = 0;
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void
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MachineCheckException(struct pt_regs *regs)
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{
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unsigned long fixup;
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unsigned int mcsr, mcsrr0, mcsrr1, mcar;
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/* Probing PCI using config cycles cause this exception
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* when a device is not present. Catch it and return to
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* the PCI exception handler.
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*/
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if ((fixup = search_exception_table(regs->nip)) != 0) {
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regs->nip = fixup;
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return;
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}
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mcsrr0 = mfspr(SPRN_MCSRR0);
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mcsrr1 = mfspr(SPRN_MCSRR1);
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mcsr = mfspr(SPRN_MCSR);
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mcar = mfspr(SPRN_MCAR);
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machinecheck_count++;
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machinecheck_error=1;
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#if defined(CONFIG_CMD_KGDB)
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if (debugger_exception_handler && (*debugger_exception_handler)(regs))
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return;
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#endif
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printf("Machine check in kernel mode.\n");
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printf("Caused by (from mcsr): ");
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printf("mcsr = 0x%08x\n", mcsr);
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if (mcsr & 0x80000000)
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printf("Machine check input pin\n");
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if (mcsr & 0x40000000)
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printf("Instruction cache parity error\n");
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if (mcsr & 0x20000000)
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printf("Data cache push parity error\n");
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if (mcsr & 0x10000000)
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printf("Data cache parity error\n");
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if (mcsr & 0x00000080)
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printf("Bus instruction address error\n");
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if (mcsr & 0x00000040)
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printf("Bus Read address error\n");
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if (mcsr & 0x00000020)
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printf("Bus Write address error\n");
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if (mcsr & 0x00000010)
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printf("Bus Instruction data bus error\n");
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if (mcsr & 0x00000008)
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printf("Bus Read data bus error\n");
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if (mcsr & 0x00000004)
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printf("Bus Write bus error\n");
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if (mcsr & 0x00000002)
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printf("Bus Instruction parity error\n");
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if (mcsr & 0x00000001)
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printf("Bus Read parity error\n");
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show_regs(regs);
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printf("MCSR=0x%08x \tMCSRR0=0x%08x \nMCSRR1=0x%08x \tMCAR=0x%08x\n",
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mcsr, mcsrr0, mcsrr1, mcar);
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print_backtrace((unsigned long *)regs->gpr[1]);
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if (machinecheck_count > 10) {
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panic("machine check count too high\n");
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}
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if (machinecheck_count > 1) {
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regs->nip += 4; /* skip offending instruction */
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printf("Skipping current instr, Returning to 0x%08x\n",
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regs->nip);
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} else {
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printf("Returning back to 0x%08x\n",regs->nip);
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}
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}
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void
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AlignmentException(struct pt_regs *regs)
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{
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#if defined(CONFIG_CMD_KGDB)
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if (debugger_exception_handler && (*debugger_exception_handler)(regs))
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return;
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#endif
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show_regs(regs);
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print_backtrace((unsigned long *)regs->gpr[1]);
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panic("Alignment Exception");
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}
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void
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ProgramCheckException(struct pt_regs *regs)
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{
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long esr_val;
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#if defined(CONFIG_CMD_KGDB)
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if (debugger_exception_handler && (*debugger_exception_handler)(regs))
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return;
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#endif
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show_regs(regs);
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esr_val = get_esr();
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if( esr_val & ESR_PIL )
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printf( "** Illegal Instruction **\n" );
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else if( esr_val & ESR_PPR )
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printf( "** Privileged Instruction **\n" );
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else if( esr_val & ESR_PTR )
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printf( "** Trap Instruction **\n" );
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print_backtrace((unsigned long *)regs->gpr[1]);
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panic("Program Check Exception");
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}
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void
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PITException(struct pt_regs *regs)
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{
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/*
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* Reset PIT interrupt
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*/
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set_tsr(0x0c000000);
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/*
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* Call timer_interrupt routine in interrupts.c
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*/
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timer_interrupt(NULL);
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}
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void
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UnknownException(struct pt_regs *regs)
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{
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#if defined(CONFIG_CMD_KGDB)
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if (debugger_exception_handler && (*debugger_exception_handler)(regs))
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return;
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#endif
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printf("Bad trap at PC: %lx, SR: %lx, vector=%lx\n",
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regs->nip, regs->msr, regs->trap);
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_exception(0, regs);
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}
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void
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ExtIntException(struct pt_regs *regs)
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{
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volatile immap_t *immap = (immap_t *)CFG_IMMR;
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volatile ccsr_pic_t *pic = &immap->im_pic;
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uint vect;
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#if defined(CONFIG_CMD_KGDB)
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if (debugger_exception_handler && (*debugger_exception_handler)(regs))
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return;
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#endif
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printf("External Interrupt Exception at PC: %lx, SR: %lx, vector=%lx",
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regs->nip, regs->msr, regs->trap);
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vect = pic->iack0;
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printf(" irq IACK0@%05x=%d\n",&pic->iack0,vect);
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show_regs(regs);
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print_backtrace((unsigned long *)regs->gpr[1]);
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machinecheck_count++;
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#ifdef EXTINT_NOSKIP
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printf("Returning back to 0x%08x\n",regs->nip);
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#else
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regs->nip += 4; /* skip offending instruction */
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printf("Skipping current instr, Returning to 0x%08x\n",regs->nip);
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#endif
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}
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void
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DebugException(struct pt_regs *regs)
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{
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printf("Debugger trap at @ %lx\n", regs->nip );
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show_regs(regs);
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#if defined(CONFIG_CMD_BEDBUG)
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do_bedbug_breakpoint( regs );
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#endif
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}
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/* Probe an address by reading. If not present, return -1, otherwise
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* return 0.
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*/
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int
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addr_probe(uint *addr)
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{
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return 0;
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}
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