--- /dev/null
+/*
+ * 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 */
+}
Code Review / kvmfornfv.git / blobdiff