67 lines
1.9 KiB
C
67 lines
1.9 KiB
C
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#ifndef __ASM_CRISv10_ARCH_BUG_H
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#define __ASM_CRISv10_ARCH_BUG_H
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#include <linux/stringify.h>
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#ifdef CONFIG_BUG
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#ifdef CONFIG_DEBUG_BUGVERBOSE
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/* The BUG() macro is used for marking obviously incorrect code paths.
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* It will cause a message with the file name and line number to be printed,
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* and then cause an oops. The message is actually printed by handle_BUG()
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* in arch/cris/kernel/traps.c, and the reason we use this method of storing
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* the file name and line number is that we do not want to affect the registers
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* by calling printk() before causing the oops.
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*/
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#define BUG_PREFIX 0x0D7F
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#define BUG_MAGIC 0x00001234
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struct bug_frame {
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unsigned short prefix;
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unsigned int magic;
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unsigned short clear;
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unsigned short movu;
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unsigned short line;
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unsigned short jump;
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unsigned char *filename;
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};
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#if 0
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/* Unfortunately this version of the macro does not work due to a problem
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* with the compiler (aka a bug) when compiling with -O2, which sometimes
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* erroneously causes the second input to be stored in a register...
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*/
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#define BUG() \
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__asm__ __volatile__ ("clear.d [" __stringify(BUG_MAGIC) "]\n\t"\
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"movu.w %0,$r0\n\t" \
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"jump %1\n\t" \
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: : "i" (__LINE__), "i" (__FILE__))
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#else
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/* This version will have to do for now, until the compiler is fixed.
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* The drawbacks of this version are that the file name will appear multiple
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* times in the .rodata section, and that __LINE__ and __FILE__ can probably
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* not be used like this with newer versions of gcc.
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*/
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#define BUG() \
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__asm__ __volatile__ ("clear.d [" __stringify(BUG_MAGIC) "]\n\t"\
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"movu.w " __stringify(__LINE__) ",$r0\n\t"\
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"jump 0f\n\t" \
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".section .rodata\n" \
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"0:\t.string \"" __FILE__ "\"\n\t" \
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".previous")
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#endif
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#else
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/* This just causes an oops. */
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#define BUG() (*(int *)0 = 0)
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#endif
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#define HAVE_ARCH_BUG
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#endif
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#include <asm-generic/bug.h>
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#endif
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