145 lines
3.6 KiB
C
145 lines
3.6 KiB
C
/* $Id: traps.c,v 1.9 2004/05/11 12:28:26 starvik Exp $
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*
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* linux/arch/cris/traps.c
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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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* Copyright (C) 2000-2002 Axis Communications AB
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*
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* Authors: Bjorn Wesen
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* Hans-Peter Nilsson
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*
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*/
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#include <linux/init.h>
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#include <linux/module.h>
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#include <asm/pgtable.h>
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#include <asm/uaccess.h>
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static int kstack_depth_to_print = 24;
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void show_trace(unsigned long * stack)
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{
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unsigned long addr, module_start, module_end;
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extern char _stext, _etext;
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int i;
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printk("\nCall Trace: ");
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i = 1;
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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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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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/*
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* If the address is either in the text segment of the
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* kernel, or in the region which contains vmalloc'ed
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* memory, it *may* be the address of a calling
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* routine; if so, print it so that someone tracing
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* down the cause of the crash will be able to figure
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* out the call path that was taken.
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*/
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if (((addr >= (unsigned long) &_stext) &&
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(addr <= (unsigned long) &_etext)) ||
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((addr >= module_start) && (addr <= module_end))) {
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if (i && ((i % 8) == 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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}
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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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/*
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* The output (format, strings and order) is adjusted to be usable with
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* ksymoops-2.4.1 with some necessary CRIS-specific patches. Please don't
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* change it unless you're serious about adjusting ksymoops and syncing
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* with the ksymoops maintainer.
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*/
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void
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show_stack(struct task_struct *task, unsigned long *sp)
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{
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unsigned long *stack, addr;
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int i;
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/*
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* debugging aid: "show_stack(NULL);" prints a
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* back trace.
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*/
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if(sp == NULL) {
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if (task)
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sp = (unsigned long*)task->thread.ksp;
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else
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sp = (unsigned long*)rdsp();
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}
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stack = sp;
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printk("\nStack from %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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if (i && ((i % 8) == 0))
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printk("\n ");
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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("%08lx ", addr);
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}
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show_trace(sp);
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}
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#if 0
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/* displays a short stack trace */
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int
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show_stack()
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{
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unsigned long *sp = (unsigned long *)rdusp();
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int i;
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printk("Stack dump [0x%08lx]:\n", (unsigned long)sp);
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for(i = 0; i < 16; i++)
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printk("sp + %d: 0x%08lx\n", i*4, sp[i]);
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return 0;
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}
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#endif
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void dump_stack(void)
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{
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show_stack(NULL, NULL);
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}
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EXPORT_SYMBOL(dump_stack);
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void __init
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trap_init(void)
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{
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/* Nothing needs to be done */
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}
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