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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /arch/cris/kernel/traps.c
downloadlinux-stericsson-2.6.12-rc2.tar.gz
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'arch/cris/kernel/traps.c')
-rw-r--r--arch/cris/kernel/traps.c144
1 files changed, 144 insertions, 0 deletions
diff --git a/arch/cris/kernel/traps.c b/arch/cris/kernel/traps.c
new file mode 100644
index 000000000000..d4dfa050e3a5
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+++ b/arch/cris/kernel/traps.c
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+/* $Id: traps.c,v 1.9 2004/05/11 12:28:26 starvik Exp $
+ *
+ * linux/arch/cris/traps.c
+ *
+ * Here we handle the break vectors not used by the system call
+ * mechanism, as well as some general stack/register dumping
+ * things.
+ *
+ * Copyright (C) 2000-2002 Axis Communications AB
+ *
+ * Authors: Bjorn Wesen
+ * Hans-Peter Nilsson
+ *
+ */
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <asm/pgtable.h>
+#include <asm/uaccess.h>
+
+static int kstack_depth_to_print = 24;
+
+void show_trace(unsigned long * stack)
+{
+ unsigned long addr, module_start, module_end;
+ extern char _stext, _etext;
+ int i;
+
+ printk("\nCall Trace: ");
+
+ i = 1;
+ module_start = VMALLOC_START;
+ module_end = VMALLOC_END;
+
+ while (((long) stack & (THREAD_SIZE-1)) != 0) {
+ if (__get_user (addr, stack)) {
+ /* This message matches "failing address" marked
+ s390 in ksymoops, so lines containing it will
+ not be filtered out by ksymoops. */
+ printk ("Failing address 0x%lx\n", (unsigned long)stack);
+ break;
+ }
+ stack++;
+
+ /*
+ * If the address is either in the text segment of the
+ * kernel, or in the region which contains vmalloc'ed
+ * memory, it *may* be the address of a calling
+ * routine; if so, print it so that someone tracing
+ * down the cause of the crash will be able to figure
+ * out the call path that was taken.
+ */
+ if (((addr >= (unsigned long) &_stext) &&
+ (addr <= (unsigned long) &_etext)) ||
+ ((addr >= module_start) && (addr <= module_end))) {
+ if (i && ((i % 8) == 0))
+ printk("\n ");
+ printk("[<%08lx>] ", addr);
+ i++;
+ }
+ }
+}
+
+/*
+ * These constants are for searching for possible module text
+ * segments. MODULE_RANGE is a guess of how much space is likely
+ * to be vmalloced.
+ */
+
+#define MODULE_RANGE (8*1024*1024)
+
+/*
+ * The output (format, strings and order) is adjusted to be usable with
+ * ksymoops-2.4.1 with some necessary CRIS-specific patches. Please don't
+ * change it unless you're serious about adjusting ksymoops and syncing
+ * with the ksymoops maintainer.
+ */
+
+void
+show_stack(struct task_struct *task, unsigned long *sp)
+{
+ unsigned long *stack, addr;
+ int i;
+
+ /*
+ * debugging aid: "show_stack(NULL);" prints a
+ * back trace.
+ */
+
+ if(sp == NULL) {
+ if (task)
+ sp = (unsigned long*)task->thread.ksp;
+ else
+ sp = (unsigned long*)rdsp();
+ }
+
+ stack = sp;
+
+ printk("\nStack from %08lx:\n ", (unsigned long)stack);
+ for(i = 0; i < kstack_depth_to_print; i++) {
+ if (((long) stack & (THREAD_SIZE-1)) == 0)
+ break;
+ if (i && ((i % 8) == 0))
+ printk("\n ");
+ if (__get_user (addr, stack)) {
+ /* This message matches "failing address" marked
+ s390 in ksymoops, so lines containing it will
+ not be filtered out by ksymoops. */
+ printk ("Failing address 0x%lx\n", (unsigned long)stack);
+ break;
+ }
+ stack++;
+ printk("%08lx ", addr);
+ }
+ show_trace(sp);
+}
+
+#if 0
+/* displays a short stack trace */
+
+int
+show_stack()
+{
+ unsigned long *sp = (unsigned long *)rdusp();
+ int i;
+ printk("Stack dump [0x%08lx]:\n", (unsigned long)sp);
+ for(i = 0; i < 16; i++)
+ printk("sp + %d: 0x%08lx\n", i*4, sp[i]);
+ return 0;
+}
+#endif
+
+void dump_stack(void)
+{
+ show_stack(NULL, NULL);
+}
+
+EXPORT_SYMBOL(dump_stack);
+
+void __init
+trap_init(void)
+{
+ /* Nothing needs to be done */
+}