[AVR32] Clean up exception handling code

  * Use generic BUG() handling
  * Remove some useless debug statements
  * Use a common function _exception() to send signals or oops when
    an exception can't be handled. This makes sure init doesn't
    enter an infinite exception loop as well. Borrowed from powerpc.
  * Add some basic exception tracing support to the page fault code.
  * Rework dump_stack(), show_regs() and friends and move everything
    into process.c
  * Print information about configuration options and chip type when
    oopsing

Signed-off-by: Haavard Skinnemoen <hskinnemoen@atmel.com>

1 files changed, 38 insertions, 12 deletions

diff --git a/include/asm-avr32/bug.h b/include/asm-avr32/bug.h
index 521766bc9366..afdcd79a2966 100644
--- a/include/asm-avr32/bug.h
+++ b/include/asm-avr32/bug.h
@@ -18,27 +18,53 @@
 
 #ifdef CONFIG_DEBUG_BUGVERBOSE
 
-#define BUG()                                                           \
-        do {                                                            \
-                asm volatile(".hword    %0\n\t"                         \
-                             ".hword    %1\n\t"                         \
-                             ".long     %2"                             \
-                             :                                          \
-                             : "n"(AVR32_BUG_OPCODE),                   \
-                               "i"(__LINE__), "X"(__FILE__));           \
-        } while (0)
+#define _BUG_OR_WARN(flags)                                             \
+        asm volatile(                                                   \
+                "1:     .hword  %0\n"                                   \
+                "       .section __bug_table,\"a\",@progbits\n"         \
+                "2:     .long   1b\n"                                   \
+                "       .long   %1\n"                                   \
+                "       .short  %2\n"                                   \
+                "       .short  %3\n"                                   \
+                "       .org    2b + %4\n"                              \
+                "       .previous"                                      \
+                :                                                       \
+                : "i"(AVR32_BUG_OPCODE), "i"(__FILE__),                 \
+                  "i"(__LINE__), "i"(flags),                            \
+                  "i"(sizeof(struct bug_entry)))
 
 #else
 
+#define _BUG_OR_WARN(flags)                                             \
+        asm volatile(                                                   \
+                "1:     .hword  %0\n"                                   \
+                "       .section __bug_table,\"a\",@progbits\n"         \
+                "2:     .long   1b\n"                                   \
+                "       .short  %1\n"                                   \
+                "       .org    2b + %2\n"                              \
+                "       .previous"                                      \
+                :                                                       \
+                : "i"(AVR32_BUG_OPCODE), "i"(flags),                    \
+                  "i"(sizeof(struct bug_entry)))
+
+#endif /* CONFIG_DEBUG_BUGVERBOSE */
+
 #define BUG()                                                           \
         do {                                                            \
-                asm volatile(".hword    %0\n\t"                         \
-                             : : "n"(AVR32_BUG_OPCODE));                \
+                _BUG_OR_WARN(0);                                        \
+                for (;;);                                               \
         } while (0)
 
-#endif /* CONFIG_DEBUG_BUGVERBOSE */
+#define WARN_ON(condition)                                                      \
+        ({                                                              \
+                typeof(condition) __ret_warn_on = (condition);          \
+                if (unlikely(__ret_warn_on))                            \
+                        _BUG_OR_WARN(BUGFLAG_WARNING);                  \
+                unlikely(__ret_warn_on);                                \
+        })
 
 #define HAVE_ARCH_BUG
+#define HAVE_ARCH_WARN_ON
 
 #endif /* CONFIG_BUG */