-/* $Id: traps.c,v 1.4 2005/04/24 18:47:55 starvik Exp $
+/*
+ * Helper functions for trap handlers
*
- * linux/arch/cris/arch-v10/traps.c
+ * Copyright (C) 2000-2007, Axis Communications AB.
*
- * Heler functions for trap handlers
- *
- * Copyright (C) 2000-2002 Axis Communications AB
- *
- * Authors: Bjorn Wesen
- * Hans-Peter Nilsson
+ * Authors: Bjorn Wesen
+ * Hans-Peter Nilsson
*
*/
#include <asm/uaccess.h>
#include <asm/arch/sv_addr_ag.h>
-extern int raw_printk(const char *fmt, ...);
-
-void
-show_registers(struct pt_regs * regs)
+void
+show_registers(struct pt_regs *regs)
{
- /* We either use rdusp() - the USP register, which might not
- correspond to the current process for all cases we're called,
- or we use the current->thread.usp, which is not up to date for
- the current process. Experience shows we want the USP
- register. */
+ /*
+ * It's possible to use either the USP register or current->thread.usp.
+ * USP might not correspond to the current process for all cases this
+ * function is called, and current->thread.usp isn't up to date for the
+ * current process. Experience shows that using USP is the way to go.
+ */
unsigned long usp = rdusp();
- raw_printk("IRP: %08lx SRP: %08lx DCCR: %08lx USP: %08lx MOF: %08lx\n",
- regs->irp, regs->srp, regs->dccr, usp, regs->mof );
- raw_printk(" r0: %08lx r1: %08lx r2: %08lx r3: %08lx\n",
+ printk("IRP: %08lx SRP: %08lx DCCR: %08lx USP: %08lx MOF: %08lx\n",
+ regs->irp, regs->srp, regs->dccr, usp, regs->mof);
+
+ printk(" r0: %08lx r1: %08lx r2: %08lx r3: %08lx\n",
regs->r0, regs->r1, regs->r2, regs->r3);
- raw_printk(" r4: %08lx r5: %08lx r6: %08lx r7: %08lx\n",
+
+ printk(" r4: %08lx r5: %08lx r6: %08lx r7: %08lx\n",
regs->r4, regs->r5, regs->r6, regs->r7);
- raw_printk(" r8: %08lx r9: %08lx r10: %08lx r11: %08lx\n",
+
+ printk(" r8: %08lx r9: %08lx r10: %08lx r11: %08lx\n",
regs->r8, regs->r9, regs->r10, regs->r11);
- raw_printk("r12: %08lx r13: %08lx oR10: %08lx sp: %08lx\n",
- regs->r12, regs->r13, regs->orig_r10, regs);
- raw_printk("R_MMU_CAUSE: %08lx\n", (unsigned long)*R_MMU_CAUSE);
- raw_printk("Process %s (pid: %d, stackpage=%08lx)\n",
+
+ printk("r12: %08lx r13: %08lx oR10: %08lx sp: %08lx\n",
+ regs->r12, regs->r13, regs->orig_r10, (long unsigned)regs);
+
+ printk("R_MMU_CAUSE: %08lx\n", (unsigned long)*R_MMU_CAUSE);
+
+ printk("Process %s (pid: %d, stackpage=%08lx)\n",
current->comm, current->pid, (unsigned long)current);
/*
- * When in-kernel, we also print out the stack and code at the
- * time of the fault..
- */
- if (! user_mode(regs)) {
- int i;
+ * When in-kernel, we also print out the stack and code at the
+ * time of the fault..
+ */
+ if (!user_mode(regs)) {
+ int i;
- show_stack(NULL, (unsigned long*)usp);
+ show_stack(NULL, (unsigned long *)usp);
- /* Dump kernel stack if the previous dump wasn't one. */
+ /*
+ * If the previous stack-dump wasn't a kernel one, dump the
+ * kernel stack now.
+ */
if (usp != 0)
- show_stack (NULL, NULL);
-
- raw_printk("\nCode: ");
- if(regs->irp < PAGE_OFFSET)
- goto bad;
-
- /* Often enough the value at regs->irp does not point to
- the interesting instruction, which is most often the
- _previous_ instruction. So we dump at an offset large
- enough that instruction decoding should be in sync at
- the interesting point, but small enough to fit on a row
- (sort of). We point out the regs->irp location in a
- ksymoops-friendly way by wrapping the byte for that
- address in parentheses. */
- for(i = -12; i < 12; i++)
- {
- unsigned char c;
- if(__get_user(c, &((unsigned char*)regs->irp)[i])) {
-bad:
- raw_printk(" Bad IP value.");
- break;
- }
+ show_stack(NULL, NULL);
+
+ printk("\nCode: ");
+
+ if (regs->irp < PAGE_OFFSET)
+ goto bad_value;
+
+ /*
+ * Quite often the value at regs->irp doesn't point to the
+ * interesting instruction, which often is the previous
+ * instruction. So dump at an offset large enough that the
+ * instruction decoding should be in sync at the interesting
+ * point, but small enough to fit on a row. The regs->irp
+ * location is pointed out in a ksymoops-friendly way by
+ * wrapping the byte for that address in parenthesises.
+ */
+ for (i = -12; i < 12; i++) {
+ unsigned char c;
+
+ if (__get_user(c, &((unsigned char *)regs->irp)[i])) {
+bad_value:
+ printk(" Bad IP value.");
+ break;
+ }
if (i == 0)
- raw_printk("(%02x) ", c);
+ printk("(%02x) ", c);
else
- raw_printk("%02x ", c);
- }
- raw_printk("\n");
- }
+ printk("%02x ", c);
+ }
+ printk("\n");
+ }
}
-/* Called from entry.S when the watchdog has bitten
- * We print out something resembling an oops dump, and if
- * we have the nice doggy development flag set, we halt here
- * instead of rebooting.
- */
-
-extern void reset_watchdog(void);
-extern void stop_watchdog(void);
-
-
void
-watchdog_bite_hook(struct pt_regs *regs)
+arch_enable_nmi(void)
{
-#ifdef CONFIG_ETRAX_WATCHDOG_NICE_DOGGY
- local_irq_disable();
- stop_watchdog();
- show_registers(regs);
- while(1) /* nothing */;
-#else
- show_registers(regs);
-#endif
+ asm volatile ("setf m");
}
-/* This is normally the 'Oops' routine */
-void
-die_if_kernel(const char * str, struct pt_regs * regs, long err)
+extern void (*nmi_handler)(struct pt_regs *);
+void handle_nmi(struct pt_regs *regs)
{
- if(user_mode(regs))
- return;
-
-#ifdef CONFIG_ETRAX_WATCHDOG_NICE_DOGGY
- /* This printout might take too long and trigger the
- * watchdog normally. If we're in the nice doggy
- * development mode, stop the watchdog during printout.
- */
- stop_watchdog();
-#endif
-
- raw_printk("%s: %04lx\n", str, err & 0xffff);
-
- show_registers(regs);
-
-#ifdef CONFIG_ETRAX_WATCHDOG_NICE_DOGGY
- reset_watchdog();
-#endif
- do_exit(SIGSEGV);
+ if (nmi_handler)
+ nmi_handler(regs);
+
+ /* Wait until nmi is no longer active. (We enable NMI immediately after
+ returning from this function, and we don't want it happening while
+ exiting from the NMI interrupt handler.) */
+ while (*R_IRQ_MASK0_RD & IO_STATE(R_IRQ_MASK0_RD, nmi_pin, active))
+ ;
}
-void arch_enable_nmi(void)
+#ifdef CONFIG_DEBUG_BUGVERBOSE
+void
+handle_BUG(struct pt_regs *regs)
{
- asm volatile("setf m");
+ struct bug_frame f;
+ unsigned char c;
+ unsigned long irp = regs->irp;
+
+ if (__copy_from_user(&f, (const void __user *)(irp - 8), sizeof f))
+ return;
+ if (f.prefix != BUG_PREFIX || f.magic != BUG_MAGIC)
+ return;
+ if (__get_user(c, f.filename))
+ f.filename = "<bad filename>";
+
+ printk("kernel BUG at %s:%d!\n", f.filename, f.line);
}
+#endif
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