Initial import

1 files changed, 239 insertions, 0 deletions

diff --git a/arch/cris/kernel/traps.c b/arch/cris/kernel/traps.c
new file mode 100644
index 000000000..da4c72401
--- /dev/null
+++ b/arch/cris/kernel/traps.c
@@ -0,0 +1,239 @@
+/*
+ *  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) 2000-2007 Axis Communications AB
+ *
+ *  Authors:   Bjorn Wesen
+ *             Hans-Peter Nilsson
+ *
+ */
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/utsname.h>
+#ifdef CONFIG_KALLSYMS
+#include <linux/kallsyms.h>
+#endif
+
+#include <asm/pgtable.h>
+#include <asm/uaccess.h>
+#include <arch/system.h>
+
+extern void arch_enable_nmi(void);
+extern void stop_watchdog(void);
+extern void reset_watchdog(void);
+extern void show_registers(struct pt_regs *regs);
+
+#ifdef CONFIG_DEBUG_BUGVERBOSE
+extern void handle_BUG(struct pt_regs *regs);
+#else
+#define handle_BUG(regs)
+#endif
+
+static int kstack_depth_to_print = 24;
+
+void (*nmi_handler)(struct pt_regs *);
+
+void show_trace(unsigned long *stack)
+{
+	unsigned long addr, module_start, module_end;
+	extern char _stext, _etext;
+	int i;
+
+	pr_err("\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.  */
+			pr_err("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))) {
+#ifdef CONFIG_KALLSYMS
+			print_ip_sym(addr);
+#else
+			if (i && ((i % 8) == 0))
+				pr_err("\n       ");
+			pr_err("[<%08lx>] ", addr);
+			i++;
+#endif
+		}
+	}
+}
+
+/*
+ * 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;
+
+	pr_err("\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))
+			pr_err("\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.  */
+			pr_err("Failing address 0x%lx\n", (unsigned long)stack);
+			break;
+		}
+		stack++;
+		pr_err("%08lx ", addr);
+	}
+	show_trace(sp);
+}
+
+#if 0
+/* displays a short stack trace */
+
+int
+show_stack(void)
+{
+	unsigned long *sp = (unsigned long *)rdusp();
+	int i;
+
+	pr_err("Stack dump [0x%08lx]:\n", (unsigned long)sp);
+	for (i = 0; i < 16; i++)
+		pr_err("sp + %d: 0x%08lx\n", i*4, sp[i]);
+	return 0;
+}
+#endif
+
+void set_nmi_handler(void (*handler)(struct pt_regs *))
+{
+	nmi_handler = handler;
+	arch_enable_nmi();
+}
+
+#ifdef CONFIG_DEBUG_NMI_OOPS
+void oops_nmi_handler(struct pt_regs *regs)
+{
+	stop_watchdog();
+	oops_in_progress = 1;
+	pr_err("NMI!\n");
+	show_registers(regs);
+	oops_in_progress = 0;
+	oops_exit();
+	pr_err("\n"); /* Flush mtdoops.  */
+}
+
+static int __init oops_nmi_register(void)
+{
+	set_nmi_handler(oops_nmi_handler);
+	return 0;
+}
+
+__initcall(oops_nmi_register);
+
+#endif
+
+/*
+ * This gets called from entry.S when the watchdog has bitten. Show something
+ * similar to an Oops dump, and if the kernel is configured to be a nice
+ * doggy, then halt instead of reboot.
+ */
+void watchdog_bite_hook(struct pt_regs *regs)
+{
+#ifdef CONFIG_ETRAX_WATCHDOG_NICE_DOGGY
+	local_irq_disable();
+	stop_watchdog();
+	show_registers(regs);
+
+	while (1)
+		; /* Do nothing. */
+#else
+	show_registers(regs);
+#endif
+}
+
+/* This is normally the Oops function. */
+void die_if_kernel(const char *str, struct pt_regs *regs, long err)
+{
+	if (user_mode(regs))
+		return;
+
+#ifdef CONFIG_ETRAX_WATCHDOG_NICE_DOGGY
+	/*
+	 * This printout might take too long and could trigger
+	 * the watchdog normally. If NICE_DOGGY is set, simply
+	 * stop the watchdog during the printout.
+	 */
+	stop_watchdog();
+#endif
+
+	oops_enter();
+	handle_BUG(regs);
+
+	pr_err("Linux %s %s\n", utsname()->release, utsname()->version);
+	pr_err("%s: %04lx\n", str, err & 0xffff);
+
+	show_registers(regs);
+
+	oops_exit();
+	oops_in_progress = 0;
+	pr_err("\n"); /* Flush mtdoops.  */
+
+#ifdef CONFIG_ETRAX_WATCHDOG_NICE_DOGGY
+	reset_watchdog();
+#endif
+	do_exit(SIGSEGV);
+}
+
+void __init trap_init(void)
+{
+	/* Nothing needs to be done */
+}