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26 results

gen_initramfs_list.sh

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  • bug.h 2.12 KiB
    #ifndef _ASM_X86_BUG_H
    #define _ASM_X86_BUG_H
    
    #include <linux/stringify.h>
    
    /*
     * Since some emulators terminate on UD2, we cannot use it for WARN.
     * Since various instruction decoders disagree on the length of UD1,
     * we cannot use it either. So use UD0 for WARN.
     *
     * (binutils knows about "ud1" but {en,de}codes it as 2 bytes, whereas
     *  our kernel decoder thinks it takes a ModRM byte, which seems consistent
     *  with various things like the Intel SDM instruction encoding rules)
     */
    
    #define ASM_UD0		".byte 0x0f, 0xff"
    #define ASM_UD1		".byte 0x0f, 0xb9" /* + ModRM */
    #define ASM_UD2		".byte 0x0f, 0x0b"
    
    #define INSN_UD0	0xff0f
    #define INSN_UD2	0x0b0f
    
    #define LEN_UD0		2
    
    #ifdef CONFIG_GENERIC_BUG
    #define HAVE_ARCH_BUG
    
    #ifdef CONFIG_X86_32
    # define __BUG_REL(val)	".long " __stringify(val)
    #else
    # define __BUG_REL(val)	".long " __stringify(val) " - 2b"
    #endif
    
    #ifdef CONFIG_DEBUG_BUGVERBOSE
    
    #define _BUG_FLAGS(ins, flags)						\
    do {									\
    	asm volatile("1:\t" ins "\n"					\
    		     ".pushsection __bug_table,\"a\"\n"			\
    		     "2:\t" __BUG_REL(1b) "\t# bug_entry::bug_addr\n"	\
    		     "\t"  __BUG_REL(%c0) "\t# bug_entry::file\n"	\
    		     "\t.word %c1"        "\t# bug_entry::line\n"	\
    		     "\t.word %c2"        "\t# bug_entry::flags\n"	\
    		     "\t.org 2b+%c3\n"					\
    		     ".popsection"					\
    		     : : "i" (__FILE__), "i" (__LINE__),		\
    			 "i" (flags),					\
    			 "i" (sizeof(struct bug_entry)));		\
    } while (0)
    
    #else /* !CONFIG_DEBUG_BUGVERBOSE */
    
    #define _BUG_FLAGS(ins, flags)						\
    do {									\
    	asm volatile("1:\t" ins "\n"					\
    		     ".pushsection __bug_table,\"a\"\n"			\
    		     "2:\t" __BUG_REL(1b) "\t# bug_entry::bug_addr\n"	\
    		     "\t.word %c0"        "\t# bug_entry::flags\n"	\
    		     "\t.org 2b+%c1\n"					\
    		     ".popsection"					\
    		     : : "i" (flags),					\
    			 "i" (sizeof(struct bug_entry)));		\
    } while (0)
    
    #endif /* CONFIG_DEBUG_BUGVERBOSE */
    
    #define BUG()							\
    do {								\
    	_BUG_FLAGS(ASM_UD2, 0);					\
    	unreachable();						\
    } while (0)
    
    #define __WARN_TAINT(taint)	_BUG_FLAGS(ASM_UD0, BUGFLAG_TAINT(taint))
    
    #endif /* CONFIG_GENERIC_BUG */
    
    #include <asm-generic/bug.h>
    
    #endif /* _ASM_X86_BUG_H */