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authorAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-08-05 17:04:01 -0300
committerAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-08-05 17:04:01 -0300
commit57f0f512b273f60d52568b8c6b77e17f5636edc0 (patch)
tree5e910f0e82173f4ef4f51111366a3f1299037a7b /arch/cris/arch-v10/kernel/traps.c
Initial import
Diffstat (limited to 'arch/cris/arch-v10/kernel/traps.c')
-rw-r--r--arch/cris/arch-v10/kernel/traps.c131
1 files changed, 131 insertions, 0 deletions
diff --git a/arch/cris/arch-v10/kernel/traps.c b/arch/cris/arch-v10/kernel/traps.c
new file mode 100644
index 000000000..7001beda7
--- /dev/null
+++ b/arch/cris/arch-v10/kernel/traps.c
@@ -0,0 +1,131 @@
+/*
+ * Helper functions for trap handlers
+ *
+ * Copyright (C) 2000-2007, Axis Communications AB.
+ *
+ * Authors: Bjorn Wesen
+ * Hans-Peter Nilsson
+ *
+ */
+
+#include <linux/ptrace.h>
+#include <asm/uaccess.h>
+#include <arch/sv_addr_ag.h>
+#include <arch/system.h>
+
+void
+show_registers(struct pt_regs *regs)
+{
+ /*
+ * 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();
+
+ 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);
+
+ printk(" r4: %08lx r5: %08lx r6: %08lx r7: %08lx\n",
+ regs->r4, regs->r5, regs->r6, regs->r7);
+
+ printk(" r8: %08lx r9: %08lx r10: %08lx r11: %08lx\n",
+ regs->r8, regs->r9, regs->r10, regs->r11);
+
+ 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;
+
+ show_stack(NULL, (unsigned long *)usp);
+
+ /*
+ * If the previous stack-dump wasn't a kernel one, dump the
+ * kernel stack now.
+ */
+ if (usp != 0)
+ 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)
+ printk("(%02x) ", c);
+ else
+ printk("%02x ", c);
+ }
+ printk("\n");
+ }
+}
+
+void
+arch_enable_nmi(void)
+{
+ asm volatile ("setf m");
+}
+
+extern void (*nmi_handler)(struct pt_regs *);
+void handle_nmi(struct pt_regs *regs)
+{
+ 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))
+ ;
+}
+
+#ifdef CONFIG_DEBUG_BUGVERBOSE
+void
+handle_BUG(struct pt_regs *regs)
+{
+ 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