CRIS: Add architecture dependent bug.h for CRIS v10 and CRIS v32

2 files changed, 99 insertions, 0 deletions

diff --git a/include/asm-cris/arch-v10/bug.h b/include/asm-cris/arch-v10/bug.h
new file mode 100644
index 00000000000..3485d6b34bb
--- /dev/null
+++ b/include/asm-cris/arch-v10/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
diff --git a/include/asm-cris/arch-v32/bug.h b/include/asm-cris/arch-v32/bug.h
new file mode 100644
index 00000000000..0f211e13524
--- /dev/null
+++ b/include/asm-cris/arch-v32/bug.h
@@ -0,0 +1,33 @@
+#ifndef __ASM_CRISv32_ARCH_BUG_H
+#define __ASM_CRISv32_ARCH_BUG_H
+
+#include <linux/stringify.h>
+
+#ifdef CONFIG_BUG
+#ifdef CONFIG_DEBUG_BUGVERBOSE
+/*
+ * The penalty for the in-band code path will be the size of break 14.
+ * All other stuff is done out-of-band with exception handlers.
+ */
+#define BUG()								\
+	__asm__ __volatile__ ("0: break 14\n\t"				\
+			      ".section .fixup,\"ax\"\n"		\
+			      "1:\n\t"					\
+			      "move.d %0, $r10\n\t"			\
+			      "move.d %1, $r11\n\t"			\
+			      "jump do_BUG\n\t"				\
+			      "nop\n\t"					\
+			      ".previous\n\t"				\
+			      ".section __ex_table,\"a\"\n\t"		\
+			      ".dword 0b, 1b\n\t"			\
+			      ".previous\n\t"				\
+			      : : "ri" (__FILE__), "i" (__LINE__))
+#else
+#define BUG() __asm__ __volatile__ ("break 14\n\t")
+#endif
+
+#define HAVE_ARCH_BUG
+#endif
+
+#include <asm-generic/bug.h>
+#endif