Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / arch / cris / include / arch-v10 / arch / bug.h

diff --git a/kernel/arch/cris/include/arch-v10/arch/bug.h b/kernel/arch/cris/include/arch-v10/arch/bug.h
new file mode 100644 (file)
index 0000000..3485d6b
--- /dev/null
+++ b/kernel/arch/cris/include/arch-v10/arch/bug.h
@@ -0,0 +1,66 @@
+#ifndef __ASM_CRISv10_ARCH_BUG_H
+#define __ASM_CRISv10_ARCH_BUG_H
+
+#include <linux/stringify.h>
+
+#ifdef CONFIG_BUG
+#ifdef CONFIG_DEBUG_BUGVERBOSE
+/* The BUG() macro is used for marking obviously incorrect code paths.
+ * It will cause a message with the file name and line number to be printed,
+ * and then cause an oops.  The message is actually printed by handle_BUG()
+ * in arch/cris/kernel/traps.c, and the reason we use this method of storing
+ * the file name and line number is that we do not want to affect the registers
+ * by calling printk() before causing the oops.
+ */
+
+#define BUG_PREFIX 0x0D7F
+#define BUG_MAGIC  0x00001234
+
+struct bug_frame {
+       unsigned short prefix;
+       unsigned int magic;
+       unsigned short clear;
+       unsigned short movu;
+       unsigned short line;
+       unsigned short jump;
+       unsigned char *filename;
+};
+
+#if 0
+/* Unfortunately this version of the macro does not work due to a problem
+ * with the compiler (aka a bug) when compiling with -O2, which sometimes
+ * erroneously causes the second input to be stored in a register...
+ */
+#define BUG()                                                          \
+       __asm__ __volatile__ ("clear.d [" __stringify(BUG_MAGIC) "]\n\t"\
+                               "movu.w %0,$r0\n\t"                     \
+                               "jump %1\n\t"                           \
+                               : : "i" (__LINE__), "i" (__FILE__))
+#else
+/* This version will have to do for now, until the compiler is fixed.
+ * The drawbacks of this version are that the file name will appear multiple
+ * times in the .rodata section, and that __LINE__ and __FILE__ can probably
+ * not be used like this with newer versions of gcc.
+ */
+#define BUG()                                                          \
+       __asm__ __volatile__ ("clear.d [" __stringify(BUG_MAGIC) "]\n\t"\
+                             "movu.w " __stringify(__LINE__) ",$r0\n\t"\
+                             "jump 0f\n\t"                             \
+                             ".section .rodata\n"                      \
+                             "0:\t.string \"" __FILE__ "\"\n\t"        \
+                             ".previous")
+#endif
+
+#else
+
+/* This just causes an oops. */
+#define BUG() (*(int *)0 = 0)
+
+#endif
+
+#define HAVE_ARCH_BUG
+#endif
+
+#include <asm-generic/bug.h>
+
+#endif