X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=include%2Fasm-x86_64%2Fbug.h;h=eed785667289fa34b0e287ba7240db98ab9866d3;hb=6d1d07e41a1de478a0da3cc14b4a8054ef09931c;hp=bdbf66eab6eebb310193f7368361460ee731552b;hpb=c8538a7aa5527d02c7191ac5da124efadf6a2827;p=linux-2.6

diff --git a/include/asm-x86_64/bug.h b/include/asm-x86_64/bug.h
index bdbf66eab6..eed7856672 100644
--- a/include/asm-x86_64/bug.h
+++ b/include/asm-x86_64/bug.h
@@ -8,19 +8,28 @@
  * this frame.
  */
 struct bug_frame {
-       unsigned char ud2[2];
+	unsigned char ud2[2];
+	unsigned char mov;
 	/* should use 32bit offset instead, but the assembler doesn't 
 	   like it */
 	char *filename;
+	unsigned char ret;
 	unsigned short line;
 } __attribute__((packed));
 
 #ifdef CONFIG_BUG
 #define HAVE_ARCH_BUG
-#define BUG() \
-	asm volatile("ud2 ; .quad %c1 ; .short %c0" :: \
+/* We turn the bug frame into valid instructions to not confuse
+   the disassembler. Thanks to Jan Beulich & Suresh Siddha
+   for nice instruction selection.
+   The magic numbers generate mov $64bitimm,%eax ; ret $offset. */
+#define BUG() 								\
+	asm volatile(							\
+	"ud2 ; .byte 0xa3 ; .quad %c1 ; .byte 0xc2 ; .short %c0" :: 	\
 		     "i"(__LINE__), "i" (__stringify(__FILE__)))
 void out_of_line_bug(void);
+#else
+static inline void out_of_line_bug(void) { }
 #endif
 
 #include <asm-generic/bug.h>