598 lines
16 KiB
C
598 lines
16 KiB
C
/* MN10300 Exception handling
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*
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* Copyright (C) 2007 Matsushita Electric Industrial Co., Ltd.
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* Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
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* Modified by David Howells (dhowells@redhat.com)
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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 Licence
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* as published by the Free Software Foundation; either version
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* 2 of the Licence, or (at your option) any later version.
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*/
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#include <linux/sched.h>
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#include <linux/kernel.h>
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#include <linux/string.h>
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#include <linux/errno.h>
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#include <linux/ptrace.h>
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#include <linux/timer.h>
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#include <linux/mm.h>
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#include <linux/smp.h>
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#include <linux/init.h>
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#include <linux/delay.h>
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#include <linux/spinlock.h>
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#include <linux/interrupt.h>
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#include <linux/kallsyms.h>
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#include <linux/pci.h>
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#include <linux/kdebug.h>
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#include <linux/bug.h>
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#include <linux/irq.h>
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#include <asm/processor.h>
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#include <asm/system.h>
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#include <asm/uaccess.h>
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#include <asm/io.h>
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#include <asm/atomic.h>
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#include <asm/smp.h>
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#include <asm/pgalloc.h>
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#include <asm/cacheflush.h>
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#include <asm/cpu-regs.h>
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#include <asm/busctl-regs.h>
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#include <unit/leds.h>
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#include <asm/fpu.h>
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#include <asm/gdb-stub.h>
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#include <asm/sections.h>
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#if (CONFIG_INTERRUPT_VECTOR_BASE & 0xffffff)
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#error "INTERRUPT_VECTOR_BASE not aligned to 16MiB boundary!"
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#endif
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int kstack_depth_to_print = 24;
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spinlock_t die_lock = __SPIN_LOCK_UNLOCKED(die_lock);
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ATOMIC_NOTIFIER_HEAD(mn10300_die_chain);
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/*
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* These constants are for searching for possible module text
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* segments. MODULE_RANGE is a guess of how much space is likely
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* to be vmalloced.
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*/
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#define MODULE_RANGE (8 * 1024 * 1024)
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#define DO_ERROR(signr, prologue, str, name) \
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asmlinkage void name(struct pt_regs *regs, u32 intcode) \
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{ \
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prologue; \
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if (die_if_no_fixup(str, regs, intcode)) \
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return; \
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force_sig(signr, current); \
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}
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#define DO_EINFO(signr, prologue, str, name, sicode) \
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asmlinkage void name(struct pt_regs *regs, u32 intcode) \
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{ \
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siginfo_t info; \
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prologue; \
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if (die_if_no_fixup(str, regs, intcode)) \
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return; \
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info.si_signo = signr; \
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if (signr == SIGILL && sicode == ILL_ILLOPC) { \
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uint8_t opcode; \
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if (get_user(opcode, (uint8_t __user *)regs->pc) == 0) \
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if (opcode == 0xff) \
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info.si_signo = SIGTRAP; \
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} \
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info.si_errno = 0; \
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info.si_code = sicode; \
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info.si_addr = (void *) regs->pc; \
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force_sig_info(info.si_signo, &info, current); \
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}
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DO_ERROR(SIGTRAP, {}, "trap", trap);
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DO_ERROR(SIGSEGV, {}, "ibreak", ibreak);
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DO_ERROR(SIGSEGV, {}, "obreak", obreak);
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DO_EINFO(SIGSEGV, {}, "access error", access_error, SEGV_ACCERR);
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DO_EINFO(SIGSEGV, {}, "insn access error", insn_acc_error, SEGV_ACCERR);
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DO_EINFO(SIGSEGV, {}, "data access error", data_acc_error, SEGV_ACCERR);
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DO_EINFO(SIGILL, {}, "privileged opcode", priv_op, ILL_PRVOPC);
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DO_EINFO(SIGILL, {}, "invalid opcode", invalid_op, ILL_ILLOPC);
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DO_EINFO(SIGILL, {}, "invalid ex opcode", invalid_exop, ILL_ILLOPC);
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DO_EINFO(SIGBUS, {}, "invalid address", mem_error, BUS_ADRERR);
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DO_EINFO(SIGBUS, {}, "bus error", bus_error, BUS_ADRERR);
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DO_ERROR(SIGTRAP,
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#ifndef CONFIG_MN10300_USING_JTAG
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DCR &= ~0x0001,
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#else
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{},
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#endif
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"single step", istep);
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/*
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* handle NMI
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*/
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asmlinkage void nmi(struct pt_regs *regs, enum exception_code code)
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{
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/* see if gdbstub wants to deal with it */
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#ifdef CONFIG_GDBSTUB
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if (gdbstub_intercept(regs, code))
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return;
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#endif
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printk(KERN_WARNING "--- Register Dump ---\n");
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show_registers(regs);
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printk(KERN_WARNING "---------------------\n");
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}
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/*
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* show a stack trace from the specified stack pointer
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*/
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void show_trace(unsigned long *sp)
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{
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unsigned long *stack, addr, module_start, module_end;
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int i;
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printk(KERN_EMERG "\nCall Trace:");
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stack = sp;
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i = 0;
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module_start = VMALLOC_START;
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module_end = VMALLOC_END;
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while (((long) stack & (THREAD_SIZE - 1)) != 0) {
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addr = *stack++;
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if (__kernel_text_address(addr)) {
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#if 1
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printk(" [<%08lx>]", addr);
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print_symbol(" %s", addr);
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printk("\n");
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#else
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if ((i % 6) == 0)
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printk(KERN_EMERG " ");
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printk("[<%08lx>] ", addr);
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i++;
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#endif
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}
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}
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printk("\n");
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}
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/*
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* show the raw stack from the specified stack pointer
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*/
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void show_stack(struct task_struct *task, unsigned long *sp)
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{
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unsigned long *stack;
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int i;
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if (!sp)
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sp = (unsigned long *) &sp;
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stack = sp;
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printk(KERN_EMERG "Stack:");
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for (i = 0; i < kstack_depth_to_print; i++) {
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if (((long) stack & (THREAD_SIZE - 1)) == 0)
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break;
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if ((i % 8) == 0)
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printk(KERN_EMERG " ");
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printk("%08lx ", *stack++);
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}
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show_trace(sp);
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}
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/*
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* the architecture-independent dump_stack generator
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*/
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void dump_stack(void)
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{
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unsigned long stack;
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show_stack(current, &stack);
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}
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EXPORT_SYMBOL(dump_stack);
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/*
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* dump the register file in the specified exception frame
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*/
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void show_registers_only(struct pt_regs *regs)
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{
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unsigned long ssp;
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ssp = (unsigned long) regs + sizeof(*regs);
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printk(KERN_EMERG "PC: %08lx EPSW: %08lx SSP: %08lx mode: %s\n",
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regs->pc, regs->epsw, ssp, user_mode(regs) ? "User" : "Super");
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printk(KERN_EMERG "d0: %08lx d1: %08lx d2: %08lx d3: %08lx\n",
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regs->d0, regs->d1, regs->d2, regs->d3);
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printk(KERN_EMERG "a0: %08lx a1: %08lx a2: %08lx a3: %08lx\n",
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regs->a0, regs->a1, regs->a2, regs->a3);
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printk(KERN_EMERG "e0: %08lx e1: %08lx e2: %08lx e3: %08lx\n",
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regs->e0, regs->e1, regs->e2, regs->e3);
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printk(KERN_EMERG "e4: %08lx e5: %08lx e6: %08lx e7: %08lx\n",
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regs->e4, regs->e5, regs->e6, regs->e7);
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printk(KERN_EMERG "lar: %08lx lir: %08lx mdr: %08lx usp: %08lx\n",
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regs->lar, regs->lir, regs->mdr, regs->sp);
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printk(KERN_EMERG "cvf: %08lx crl: %08lx crh: %08lx drq: %08lx\n",
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regs->mcvf, regs->mcrl, regs->mcrh, regs->mdrq);
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printk(KERN_EMERG "threadinfo=%p task=%p)\n",
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current_thread_info(), current);
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if ((unsigned long) current >= PAGE_OFFSET &&
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(unsigned long) current < (unsigned long)high_memory)
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printk(KERN_EMERG "Process %s (pid: %d)\n",
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current->comm, current->pid);
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#ifdef CONFIG_SMP
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printk(KERN_EMERG "CPUID: %08x\n", CPUID);
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#endif
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printk(KERN_EMERG "CPUP: %04hx\n", CPUP);
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printk(KERN_EMERG "TBR: %08x\n", TBR);
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printk(KERN_EMERG "DEAR: %08x\n", DEAR);
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printk(KERN_EMERG "sISR: %08x\n", sISR);
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printk(KERN_EMERG "NMICR: %04hx\n", NMICR);
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printk(KERN_EMERG "BCBERR: %08x\n", BCBERR);
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printk(KERN_EMERG "BCBEAR: %08x\n", BCBEAR);
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printk(KERN_EMERG "MMUFCR: %08x\n", MMUFCR);
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printk(KERN_EMERG "IPTEU : %08x IPTEL2: %08x\n", IPTEU, IPTEL2);
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printk(KERN_EMERG "DPTEU: %08x DPTEL2: %08x\n", DPTEU, DPTEL2);
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}
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/*
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* dump the registers and the stack
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*/
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void show_registers(struct pt_regs *regs)
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{
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unsigned long sp;
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int i;
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show_registers_only(regs);
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if (!user_mode(regs))
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sp = (unsigned long) regs + sizeof(*regs);
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else
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sp = regs->sp;
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/* when in-kernel, we also print out the stack and code at the
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* time of the fault..
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*/
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if (!user_mode(regs)) {
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printk(KERN_EMERG "\n");
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show_stack(current, (unsigned long *) sp);
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#if 0
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printk(KERN_EMERG "\nCode: ");
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if (regs->pc < PAGE_OFFSET)
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goto bad;
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for (i = 0; i < 20; i++) {
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unsigned char c;
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if (__get_user(c, &((unsigned char *) regs->pc)[i]))
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goto bad;
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printk("%02x ", c);
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}
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#else
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i = 0;
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#endif
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}
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printk("\n");
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return;
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#if 0
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bad:
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printk(KERN_EMERG " Bad PC value.");
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break;
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#endif
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}
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/*
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*
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*/
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void show_trace_task(struct task_struct *tsk)
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{
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unsigned long sp = tsk->thread.sp;
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/* User space on another CPU? */
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if ((sp ^ (unsigned long) tsk) & (PAGE_MASK << 1))
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return;
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show_trace((unsigned long *) sp);
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}
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/*
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* note the untimely death of part of the kernel
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*/
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void die(const char *str, struct pt_regs *regs, enum exception_code code)
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{
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console_verbose();
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spin_lock_irq(&die_lock);
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printk(KERN_EMERG "\n%s: %04x\n",
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str, code & 0xffff);
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show_registers(regs);
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if (regs->pc >= 0x02000000 && regs->pc < 0x04000000 &&
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(regs->epsw & (EPSW_IM | EPSW_IE)) != (EPSW_IM | EPSW_IE)) {
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printk(KERN_EMERG "Exception in usermode interrupt handler\n");
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printk(KERN_EMERG "\nPlease connect to kernel debugger !!\n");
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asm volatile ("0: bra 0b");
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}
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spin_unlock_irq(&die_lock);
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do_exit(SIGSEGV);
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}
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/*
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* see if there's a fixup handler we can force a jump to when an exception
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* happens due to something kernel code did
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*/
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int die_if_no_fixup(const char *str, struct pt_regs *regs,
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enum exception_code code)
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{
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if (user_mode(regs))
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return 0;
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peripheral_leds_display_exception(code);
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switch (code) {
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/* see if we can fixup the kernel accessing memory */
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case EXCEP_ITLBMISS:
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case EXCEP_DTLBMISS:
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case EXCEP_IAERROR:
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case EXCEP_DAERROR:
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case EXCEP_MEMERR:
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case EXCEP_MISALIGN:
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case EXCEP_BUSERROR:
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case EXCEP_ILLDATACC:
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case EXCEP_IOINSACC:
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case EXCEP_PRIVINSACC:
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case EXCEP_PRIVDATACC:
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case EXCEP_DATINSACC:
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if (fixup_exception(regs))
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return 1;
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case EXCEP_UNIMPINS:
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if (regs->pc && *(uint8_t *)regs->pc == 0xff)
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if (notify_die(DIE_BREAKPOINT, str, regs, code, 0, 0))
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return 1;
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break;
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default:
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break;
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}
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/* see if gdbstub wants to deal with it */
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#ifdef CONFIG_GDBSTUB
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if (gdbstub_intercept(regs, code))
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return 1;
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#endif
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if (notify_die(DIE_GPF, str, regs, code, 0, 0))
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return 1;
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/* make the process die as the last resort */
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die(str, regs, code);
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}
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/*
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* handle unsupported syscall instructions (syscall 1-15)
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*/
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static asmlinkage void unsupported_syscall(struct pt_regs *regs,
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enum exception_code code)
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{
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struct task_struct *tsk = current;
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siginfo_t info;
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/* catch a kernel BUG() */
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if (code == EXCEP_SYSCALL15 && !user_mode(regs)) {
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if (report_bug(regs->pc, regs) == BUG_TRAP_TYPE_BUG) {
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#ifdef CONFIG_GDBSTUB
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gdbstub_intercept(regs, code);
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#endif
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}
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}
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regs->pc -= 2; /* syscall return addr is _after_ the instruction */
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die_if_no_fixup("An unsupported syscall insn was used by the kernel\n",
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regs, code);
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info.si_signo = SIGILL;
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info.si_errno = ENOSYS;
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info.si_code = ILL_ILLTRP;
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info.si_addr = (void *) regs->pc;
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force_sig_info(SIGILL, &info, tsk);
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}
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/*
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* display the register file when the stack pointer gets clobbered
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*/
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asmlinkage void do_double_fault(struct pt_regs *regs)
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{
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struct task_struct *tsk = current;
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strcpy(tsk->comm, "emergency tsk");
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tsk->pid = 0;
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console_verbose();
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printk(KERN_EMERG "--- double fault ---\n");
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show_registers(regs);
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}
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/*
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* asynchronous bus error (external, usually I/O DMA)
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*/
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asmlinkage void io_bus_error(u32 bcberr, u32 bcbear, struct pt_regs *regs)
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{
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console_verbose();
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printk(KERN_EMERG "Asynchronous I/O Bus Error\n");
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printk(KERN_EMERG "==========================\n");
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if (bcberr & BCBERR_BEME)
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printk(KERN_EMERG "- Multiple recorded errors\n");
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printk(KERN_EMERG "- Faulting Buses:%s%s%s\n",
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bcberr & BCBERR_BEMR_CI ? " CPU-Ins-Fetch" : "",
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bcberr & BCBERR_BEMR_CD ? " CPU-Data" : "",
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bcberr & BCBERR_BEMR_DMA ? " DMA" : "");
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printk(KERN_EMERG "- %s %s access made to %s at address %08x\n",
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bcberr & BCBERR_BEBST ? "Burst" : "Single",
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bcberr & BCBERR_BERW ? "Read" : "Write",
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bcberr & BCBERR_BESB_MON ? "Monitor Space" :
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bcberr & BCBERR_BESB_IO ? "Internal CPU I/O Space" :
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bcberr & BCBERR_BESB_EX ? "External I/O Bus" :
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bcberr & BCBERR_BESB_OPEX ? "External Memory Bus" :
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"On Chip Memory",
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bcbear
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);
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printk(KERN_EMERG "- Detected by the %s\n",
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bcberr&BCBERR_BESD ? "Bus Control Unit" : "Slave Bus");
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#ifdef CONFIG_PCI
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#define BRIDGEREGB(X) (*(volatile __u8 *)(0xBE040000 + (X)))
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#define BRIDGEREGW(X) (*(volatile __u16 *)(0xBE040000 + (X)))
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#define BRIDGEREGL(X) (*(volatile __u32 *)(0xBE040000 + (X)))
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printk(KERN_EMERG "- PCI Memory Paging Reg: %08x\n",
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*(volatile __u32 *) (0xBFFFFFF4));
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printk(KERN_EMERG "- PCI Bridge Base Address 0: %08x\n",
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BRIDGEREGL(PCI_BASE_ADDRESS_0));
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printk(KERN_EMERG "- PCI Bridge AMPCI Base Address: %08x\n",
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BRIDGEREGL(0x48));
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printk(KERN_EMERG "- PCI Bridge Command: %04hx\n",
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BRIDGEREGW(PCI_COMMAND));
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printk(KERN_EMERG "- PCI Bridge Status: %04hx\n",
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BRIDGEREGW(PCI_STATUS));
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printk(KERN_EMERG "- PCI Bridge Int Status: %08hx\n",
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BRIDGEREGL(0x4c));
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#endif
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printk(KERN_EMERG "\n");
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show_registers(regs);
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panic("Halted due to asynchronous I/O Bus Error\n");
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}
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/*
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* handle an exception for which a handler has not yet been installed
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*/
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asmlinkage void uninitialised_exception(struct pt_regs *regs,
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enum exception_code code)
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{
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/* see if gdbstub wants to deal with it */
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#ifdef CONFIG_GDBSTUB
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if (gdbstub_intercept(regs, code))
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return;
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#endif
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peripheral_leds_display_exception(code);
|
|
printk(KERN_EMERG "Uninitialised Exception 0x%04x\n", code & 0xFFFF);
|
|
show_registers(regs);
|
|
|
|
for (;;)
|
|
continue;
|
|
}
|
|
|
|
/*
|
|
* set an interrupt stub to jump to a handler
|
|
* ! NOTE: this does *not* flush the caches
|
|
*/
|
|
void __init __set_intr_stub(enum exception_code code, void *handler)
|
|
{
|
|
unsigned long addr;
|
|
u8 *vector = (u8 *)(CONFIG_INTERRUPT_VECTOR_BASE + code);
|
|
|
|
addr = (unsigned long) handler - (unsigned long) vector;
|
|
vector[0] = 0xdc; /* JMP handler */
|
|
vector[1] = addr;
|
|
vector[2] = addr >> 8;
|
|
vector[3] = addr >> 16;
|
|
vector[4] = addr >> 24;
|
|
vector[5] = 0xcb;
|
|
vector[6] = 0xcb;
|
|
vector[7] = 0xcb;
|
|
}
|
|
|
|
/*
|
|
* set an interrupt stub to jump to a handler
|
|
*/
|
|
void __init set_intr_stub(enum exception_code code, void *handler)
|
|
{
|
|
unsigned long addr;
|
|
u8 *vector = (u8 *)(CONFIG_INTERRUPT_VECTOR_BASE + code);
|
|
unsigned long flags;
|
|
|
|
addr = (unsigned long) handler - (unsigned long) vector;
|
|
|
|
flags = arch_local_cli_save();
|
|
|
|
vector[0] = 0xdc; /* JMP handler */
|
|
vector[1] = addr;
|
|
vector[2] = addr >> 8;
|
|
vector[3] = addr >> 16;
|
|
vector[4] = addr >> 24;
|
|
vector[5] = 0xcb;
|
|
vector[6] = 0xcb;
|
|
vector[7] = 0xcb;
|
|
|
|
arch_local_irq_restore(flags);
|
|
|
|
#ifndef CONFIG_MN10300_CACHE_SNOOP
|
|
mn10300_dcache_flush_inv();
|
|
mn10300_icache_inv();
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
* initialise the exception table
|
|
*/
|
|
void __init trap_init(void)
|
|
{
|
|
set_excp_vector(EXCEP_TRAP, trap);
|
|
set_excp_vector(EXCEP_ISTEP, istep);
|
|
set_excp_vector(EXCEP_IBREAK, ibreak);
|
|
set_excp_vector(EXCEP_OBREAK, obreak);
|
|
|
|
set_excp_vector(EXCEP_PRIVINS, priv_op);
|
|
set_excp_vector(EXCEP_UNIMPINS, invalid_op);
|
|
set_excp_vector(EXCEP_UNIMPEXINS, invalid_exop);
|
|
set_excp_vector(EXCEP_MEMERR, mem_error);
|
|
set_excp_vector(EXCEP_MISALIGN, misalignment);
|
|
set_excp_vector(EXCEP_BUSERROR, bus_error);
|
|
set_excp_vector(EXCEP_ILLINSACC, insn_acc_error);
|
|
set_excp_vector(EXCEP_ILLDATACC, data_acc_error);
|
|
set_excp_vector(EXCEP_IOINSACC, insn_acc_error);
|
|
set_excp_vector(EXCEP_PRIVINSACC, insn_acc_error);
|
|
set_excp_vector(EXCEP_PRIVDATACC, data_acc_error);
|
|
set_excp_vector(EXCEP_DATINSACC, insn_acc_error);
|
|
set_excp_vector(EXCEP_FPU_UNIMPINS, fpu_invalid_op);
|
|
set_excp_vector(EXCEP_FPU_OPERATION, fpu_exception);
|
|
|
|
set_excp_vector(EXCEP_NMI, nmi);
|
|
|
|
set_excp_vector(EXCEP_SYSCALL1, unsupported_syscall);
|
|
set_excp_vector(EXCEP_SYSCALL2, unsupported_syscall);
|
|
set_excp_vector(EXCEP_SYSCALL3, unsupported_syscall);
|
|
set_excp_vector(EXCEP_SYSCALL4, unsupported_syscall);
|
|
set_excp_vector(EXCEP_SYSCALL5, unsupported_syscall);
|
|
set_excp_vector(EXCEP_SYSCALL6, unsupported_syscall);
|
|
set_excp_vector(EXCEP_SYSCALL7, unsupported_syscall);
|
|
set_excp_vector(EXCEP_SYSCALL8, unsupported_syscall);
|
|
set_excp_vector(EXCEP_SYSCALL9, unsupported_syscall);
|
|
set_excp_vector(EXCEP_SYSCALL10, unsupported_syscall);
|
|
set_excp_vector(EXCEP_SYSCALL11, unsupported_syscall);
|
|
set_excp_vector(EXCEP_SYSCALL12, unsupported_syscall);
|
|
set_excp_vector(EXCEP_SYSCALL13, unsupported_syscall);
|
|
set_excp_vector(EXCEP_SYSCALL14, unsupported_syscall);
|
|
set_excp_vector(EXCEP_SYSCALL15, unsupported_syscall);
|
|
}
|
|
|
|
/*
|
|
* determine if a program counter value is a valid bug address
|
|
*/
|
|
int is_valid_bugaddr(unsigned long pc)
|
|
{
|
|
return pc >= PAGE_OFFSET;
|
|
}
|