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[PATCH] Generic BUG for i386

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This makes i386 use the generic BUG machinery.  There are no functional
changes from the old i386 implementation.

The main advantage in using the generic BUG machinery for i386 is that the
inlined overhead of BUG is just the ud2a instruction; the file+line(+function)
information are no longer inlined into the instruction stream.  This reduces
cache pollution, and makes disassembly work properly.

Signed-off-by: Jeremy Fitzhardinge <[email protected]>
Cc: Andi Kleen <[email protected]>
Cc: Hugh Dickens <[email protected]>
Cc: Michael Ellerman <[email protected]>
Cc: Paul Mackerras <[email protected]>
Cc: Benjamin Herrenschmidt <[email protected]>
Cc: Rusty Russell <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Jeremy Fitzhardinge 2006-12-08 02:36:21 -08:00 • committed by Linus Torvalds
commit 91768d6c2b
6 changed files with 42 additions and 40 deletions
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28
include/asm-i386/bug.h
View file

@ -4,20 +4,32 @@
/*
* Tell the user there is some problem.
* The offending file and line are encoded after the "officially
* undefined" opcode for parsing in the trap handler.
* The offending file and line are encoded encoded in the __bug_table section.
*/
#ifdef CONFIG_BUG
#define HAVE_ARCH_BUG
#ifdef CONFIG_DEBUG_BUGVERBOSE
#define BUG() \
__asm__ __volatile__( "ud2\n" \
"\t.word %c0\n" \
"\t.long %c1\n" \
: : "i" (__LINE__), "i" (__FILE__))
#define BUG() \
do { \
asm volatile("1:\tud2\n" \
".pushsection __bug_table,\"a\"\n" \
"2:\t.long 1b, %c0\n" \
"\t.word %c1, 0\n" \
"\t.org 2b+%c2\n" \
".popsection" \
: : "i" (__FILE__), "i" (__LINE__), \
"i" (sizeof(struct bug_entry))); \
for(;;) ; \
} while(0)
#else
#define BUG() __asm__ __volatile__("ud2\n")
#define BUG() \
do { \
asm volatile("ud2"); \
for(;;) ; \
} while(0)
#endif
#endif