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OpenRISC: Traps
Signed-off-by: Jonas Bonn <jonas@southpole.se> Reviewed-by: Arnd Bergmann <arnd@arndb.de>
This commit is contained in:
Jonas Bonn
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769a8a9622
1 changed files with 366 additions and 0 deletions
366
arch/openrisc/kernel/traps.c
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366
arch/openrisc/kernel/traps.c
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/*
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* OpenRISC traps.c
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*
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* Linux architectural port borrowing liberally from similar works of
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* others. All original copyrights apply as per the original source
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* declaration.
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*
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* Modifications for the OpenRISC architecture:
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* Copyright (C) 2003 Matjaz Breskvar <phoenix@bsemi.com>
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* Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se>
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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
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*
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* Here we handle the break vectors not used by the system call
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* mechanism, as well as some general stack/register dumping
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* things.
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*
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*/
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#include <linux/init.h>
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#include <linux/sched.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/kmod.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/kallsyms.h>
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#include <asm/uaccess.h>
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#include <asm/system.h>
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#include <asm/segment.h>
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#include <asm/io.h>
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#include <asm/pgtable.h>
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extern char _etext, _stext;
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int kstack_depth_to_print = 0x180;
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static inline int valid_stack_ptr(struct thread_info *tinfo, void *p)
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{
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return p > (void *)tinfo && p < (void *)tinfo + THREAD_SIZE - 3;
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}
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void show_trace(struct task_struct *task, unsigned long *stack)
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{
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struct thread_info *context;
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unsigned long addr;
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context = (struct thread_info *)
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((unsigned long)stack & (~(THREAD_SIZE - 1)));
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while (valid_stack_ptr(context, stack)) {
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addr = *stack++;
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if (__kernel_text_address(addr)) {
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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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}
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}
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printk(" =======================\n");
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}
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/* displays a short stack trace */
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void show_stack(struct task_struct *task, unsigned long *esp)
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{
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unsigned long addr, *stack;
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int i;
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if (esp == NULL)
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esp = (unsigned long *)&esp;
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stack = esp;
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printk("Stack dump [0x%08lx]:\n", (unsigned long)esp);
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for (i = 0; i < kstack_depth_to_print; i++) {
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if (kstack_end(stack))
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break;
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if (__get_user(addr, stack)) {
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/* This message matches "failing address" marked
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s390 in ksymoops, so lines containing it will
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not be filtered out by ksymoops. */
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printk("Failing address 0x%lx\n", (unsigned long)stack);
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break;
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}
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stack++;
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printk("sp + %02d: 0x%08lx\n", i * 4, addr);
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}
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printk("\n");
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show_trace(task, esp);
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return;
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}
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void show_trace_task(struct task_struct *tsk)
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{
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/*
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* TODO: SysRq-T trace dump...
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*/
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}
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/*
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* The architecture-independent backtrace 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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void show_registers(struct pt_regs *regs)
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{
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int i;
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int in_kernel = 1;
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unsigned long esp;
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esp = (unsigned long)(®s->sp);
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if (user_mode(regs))
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in_kernel = 0;
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printk("CPU #: %d\n"
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" PC: %08lx SR: %08lx SP: %08lx\n",
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smp_processor_id(), regs->pc, regs->sr, regs->sp);
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printk("GPR00: %08lx GPR01: %08lx GPR02: %08lx GPR03: %08lx\n",
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0L, regs->gpr[1], regs->gpr[2], regs->gpr[3]);
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printk("GPR04: %08lx GPR05: %08lx GPR06: %08lx GPR07: %08lx\n",
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regs->gpr[4], regs->gpr[5], regs->gpr[6], regs->gpr[7]);
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printk("GPR08: %08lx GPR09: %08lx GPR10: %08lx GPR11: %08lx\n",
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regs->gpr[8], regs->gpr[9], regs->gpr[10], regs->gpr[11]);
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printk("GPR12: %08lx GPR13: %08lx GPR14: %08lx GPR15: %08lx\n",
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regs->gpr[12], regs->gpr[13], regs->gpr[14], regs->gpr[15]);
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printk("GPR16: %08lx GPR17: %08lx GPR18: %08lx GPR19: %08lx\n",
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regs->gpr[16], regs->gpr[17], regs->gpr[18], regs->gpr[19]);
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printk("GPR20: %08lx GPR21: %08lx GPR22: %08lx GPR23: %08lx\n",
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regs->gpr[20], regs->gpr[21], regs->gpr[22], regs->gpr[23]);
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printk("GPR24: %08lx GPR25: %08lx GPR26: %08lx GPR27: %08lx\n",
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regs->gpr[24], regs->gpr[25], regs->gpr[26], regs->gpr[27]);
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printk("GPR28: %08lx GPR29: %08lx GPR30: %08lx GPR31: %08lx\n",
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regs->gpr[28], regs->gpr[29], regs->gpr[30], regs->gpr[31]);
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printk(" RES: %08lx oGPR11: %08lx syscallno: %08lx\n",
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regs->gpr[11], regs->orig_gpr11, regs->syscallno);
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printk("Process %s (pid: %d, stackpage=%08lx)\n",
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current->comm, current->pid, (unsigned long)current);
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/*
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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 (in_kernel) {
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printk("\nStack: ");
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show_stack(NULL, (unsigned long *)esp);
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printk("\nCode: ");
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if (regs->pc < PAGE_OFFSET)
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goto bad;
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for (i = -24; i < 24; 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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bad:
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printk(" Bad PC value.");
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break;
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}
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if (i == 0)
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printk("(%02x) ", c);
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else
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printk("%02x ", c);
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}
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}
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printk("\n");
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}
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void nommu_dump_state(struct pt_regs *regs,
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unsigned long ea, unsigned long vector)
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{
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int i;
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unsigned long addr, stack = regs->sp;
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printk("\n\r[nommu_dump_state] :: ea %lx, vector %lx\n\r", ea, vector);
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printk("CPU #: %d\n"
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" PC: %08lx SR: %08lx SP: %08lx\n",
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0, regs->pc, regs->sr, regs->sp);
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printk("GPR00: %08lx GPR01: %08lx GPR02: %08lx GPR03: %08lx\n",
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0L, regs->gpr[1], regs->gpr[2], regs->gpr[3]);
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printk("GPR04: %08lx GPR05: %08lx GPR06: %08lx GPR07: %08lx\n",
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regs->gpr[4], regs->gpr[5], regs->gpr[6], regs->gpr[7]);
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printk("GPR08: %08lx GPR09: %08lx GPR10: %08lx GPR11: %08lx\n",
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regs->gpr[8], regs->gpr[9], regs->gpr[10], regs->gpr[11]);
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printk("GPR12: %08lx GPR13: %08lx GPR14: %08lx GPR15: %08lx\n",
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regs->gpr[12], regs->gpr[13], regs->gpr[14], regs->gpr[15]);
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printk("GPR16: %08lx GPR17: %08lx GPR18: %08lx GPR19: %08lx\n",
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regs->gpr[16], regs->gpr[17], regs->gpr[18], regs->gpr[19]);
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printk("GPR20: %08lx GPR21: %08lx GPR22: %08lx GPR23: %08lx\n",
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regs->gpr[20], regs->gpr[21], regs->gpr[22], regs->gpr[23]);
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printk("GPR24: %08lx GPR25: %08lx GPR26: %08lx GPR27: %08lx\n",
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regs->gpr[24], regs->gpr[25], regs->gpr[26], regs->gpr[27]);
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printk("GPR28: %08lx GPR29: %08lx GPR30: %08lx GPR31: %08lx\n",
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regs->gpr[28], regs->gpr[29], regs->gpr[30], regs->gpr[31]);
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printk(" RES: %08lx oGPR11: %08lx syscallno: %08lx\n",
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regs->gpr[11], regs->orig_gpr11, regs->syscallno);
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printk("Process %s (pid: %d, stackpage=%08lx)\n",
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((struct task_struct *)(__pa(current)))->comm,
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((struct task_struct *)(__pa(current)))->pid,
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(unsigned long)current);
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printk("\nStack: ");
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printk("Stack dump [0x%08lx]:\n", (unsigned long)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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stack++;
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printk("%lx :: sp + %02d: 0x%08lx\n", stack, i * 4,
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*((unsigned long *)(__pa(stack))));
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}
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printk("\n");
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printk("Call Trace: ");
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i = 1;
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while (((long)stack & (THREAD_SIZE - 1)) != 0) {
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addr = *((unsigned long *)__pa(stack));
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stack++;
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if (kernel_text_address(addr)) {
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if (i && ((i % 6) == 0))
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printk("\n ");
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printk(" [<%08lx>]", addr);
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i++;
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}
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}
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printk("\n");
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printk("\nCode: ");
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for (i = -24; i < 24; i++) {
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unsigned char c;
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c = ((unsigned char *)(__pa(regs->pc)))[i];
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if (i == 0)
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printk("(%02x) ", c);
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else
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printk("%02x ", c);
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}
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printk("\n");
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}
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/* This is normally the 'Oops' routine */
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void die(const char *str, struct pt_regs *regs, long err)
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{
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console_verbose();
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printk("\n%s#: %04lx\n", str, err & 0xffff);
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show_registers(regs);
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#ifdef CONFIG_JUMP_UPON_UNHANDLED_EXCEPTION
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printk("\n\nUNHANDLED_EXCEPTION: entering infinite loop\n");
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/* shut down interrupts */
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local_irq_disable();
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__asm__ __volatile__("l.nop 1");
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do {} while (1);
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#endif
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do_exit(SIGSEGV);
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}
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/* This is normally the 'Oops' routine */
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void die_if_kernel(const char *str, struct pt_regs *regs, long err)
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{
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if (user_mode(regs))
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return;
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die(str, regs, err);
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}
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void unhandled_exception(struct pt_regs *regs, int ea, int vector)
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{
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printk("Unable to handle exception at EA =0x%x, vector 0x%x",
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ea, vector);
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die("Oops", regs, 9);
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}
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void __init trap_init(void)
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{
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/* Nothing needs to be done */
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}
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asmlinkage void do_trap(struct pt_regs *regs, unsigned long address)
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{
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siginfo_t info;
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memset(&info, 0, sizeof(info));
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info.si_signo = SIGTRAP;
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info.si_code = TRAP_TRACE;
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info.si_addr = (void *)address;
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force_sig_info(SIGTRAP, &info, current);
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regs->pc += 4;
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}
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asmlinkage void do_unaligned_access(struct pt_regs *regs, unsigned long address)
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{
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siginfo_t info;
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if (user_mode(regs)) {
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/* Send a SIGSEGV */
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info.si_signo = SIGSEGV;
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info.si_errno = 0;
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/* info.si_code has been set above */
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info.si_addr = (void *)address;
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force_sig_info(SIGSEGV, &info, current);
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} else {
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printk("KERNEL: Unaligned Access 0x%.8lx\n", address);
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show_registers(regs);
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die("Die:", regs, address);
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}
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}
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asmlinkage void do_bus_fault(struct pt_regs *regs, unsigned long address)
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{
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siginfo_t info;
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if (user_mode(regs)) {
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/* Send a SIGBUS */
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info.si_signo = SIGBUS;
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info.si_errno = 0;
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info.si_code = BUS_ADRERR;
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info.si_addr = (void *)address;
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force_sig_info(SIGBUS, &info, current);
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} else { /* Kernel mode */
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printk("KERNEL: Bus error (SIGBUS) 0x%.8lx\n", address);
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show_registers(regs);
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die("Die:", regs, address);
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}
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}
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asmlinkage void do_illegal_instruction(struct pt_regs *regs,
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unsigned long address)
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{
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siginfo_t info;
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if (user_mode(regs)) {
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/* Send a SIGILL */
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info.si_signo = SIGILL;
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info.si_errno = 0;
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info.si_code = ILL_ILLOPC;
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info.si_addr = (void *)address;
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force_sig_info(SIGBUS, &info, current);
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} else { /* Kernel mode */
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printk("KERNEL: Illegal instruction (SIGILL) 0x%.8lx\n",
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address);
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show_registers(regs);
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die("Die:", regs, address);
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}
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}
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