32818c2eb6
I recently had a BUG_ON() go off spuriously on a gcc 4.0 compiled kernel. It turns out gcc-4.0 was removing a sign extension while earlier gcc versions would not. Thinking this to be a compiler bug, I submitted a report: http://gcc.gnu.org/bugzilla/show_bug.cgi?id=23422 It turns out we need to cast the input in order to tell gcc to sign extend it. Thanks to Andrew Pinski for his help on this bug. Signed-off-by: Anton Blanchard <anton@samba.org> Cc: Paul Mackerras <paulus@samba.org> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
70 lines
1.6 KiB
C
70 lines
1.6 KiB
C
#ifndef _PPC64_BUG_H
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#define _PPC64_BUG_H
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/*
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* Define an illegal instr to trap on the bug.
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* We don't use 0 because that marks the end of a function
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* in the ELF ABI. That's "Boo Boo" in case you wonder...
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*/
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#define BUG_OPCODE .long 0x00b00b00 /* For asm */
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#define BUG_ILLEGAL_INSTR "0x00b00b00" /* For BUG macro */
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#ifndef __ASSEMBLY__
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struct bug_entry {
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unsigned long bug_addr;
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long line;
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const char *file;
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const char *function;
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};
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struct bug_entry *find_bug(unsigned long bugaddr);
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/*
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* If this bit is set in the line number it means that the trap
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* is for WARN_ON rather than BUG or BUG_ON.
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*/
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#define BUG_WARNING_TRAP 0x1000000
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#ifdef CONFIG_BUG
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#define BUG() do { \
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__asm__ __volatile__( \
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"1: twi 31,0,0\n" \
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".section __bug_table,\"a\"\n\t" \
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" .llong 1b,%0,%1,%2\n" \
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".previous" \
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: : "i" (__LINE__), "i" (__FILE__), "i" (__FUNCTION__)); \
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} while (0)
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#define BUG_ON(x) do { \
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__asm__ __volatile__( \
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"1: tdnei %0,0\n" \
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".section __bug_table,\"a\"\n\t" \
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" .llong 1b,%1,%2,%3\n" \
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".previous" \
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: : "r" ((long long)(x)), "i" (__LINE__), \
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"i" (__FILE__), "i" (__FUNCTION__)); \
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} while (0)
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#define WARN_ON(x) do { \
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__asm__ __volatile__( \
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"1: tdnei %0,0\n" \
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".section __bug_table,\"a\"\n\t" \
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" .llong 1b,%1,%2,%3\n" \
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".previous" \
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: : "r" ((long long)(x)), \
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"i" (__LINE__ + BUG_WARNING_TRAP), \
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"i" (__FILE__), "i" (__FUNCTION__)); \
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} while (0)
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#define HAVE_ARCH_BUG
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#define HAVE_ARCH_BUG_ON
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#define HAVE_ARCH_WARN_ON
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#endif
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#endif
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#include <asm-generic/bug.h>
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#endif
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