bug.h

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#ifndef _ASMARM_BUG_H
#define _ASMARM_BUG_H

#include <linux/linkage.h>

#ifdef CONFIG_BUG

/*
 * Use a suitable undefined instruction to use for ARM/Thumb2 bug handling.
 * We need to be careful not to conflict with those used by other modules and
 * the register_undef_hook() system.
 */
#ifdef CONFIG_THUMB2_KERNEL
#define BUG_INSTR_VALUE 0xde02
#define BUG_INSTR_TYPE ".hword "
#else
#define BUG_INSTR_VALUE 0xe7f001f2
#define BUG_INSTR_TYPE ".word "
#endif


#define BUG() _BUG(__FILE__, __LINE__, BUG_INSTR_VALUE)
#define _BUG(file, line, value) __BUG(file, line, value)

#ifdef CONFIG_DEBUG_BUGVERBOSE

/*
 * The extra indirection is to ensure that the __FILE__ string comes through
 * OK. Many version of gcc do not support the asm %c parameter which would be
 * preferable to this unpleasantness. We use mergeable string sections to
 * avoid multiple copies of the string appearing in the kernel image.
 */

#define __BUG(__file, __line, __value)              \
do {                                \
    asm volatile("1:\t" BUG_INSTR_TYPE #__value "\n"    \
        ".pushsection .rodata.str, \"aMS\", %progbits, 1\n" \
        "2:\t.asciz " #__file "\n"          \
        ".popsection\n"                 \
        ".pushsection __bug_table,\"a\"\n"      \
        "3:\t.word 1b, 2b\n"                \
        "\t.hword " #__line ", 0\n"         \
        ".popsection");                 \
    unreachable();                      \
} while (0)

#else  /* not CONFIG_DEBUG_BUGVERBOSE */

#define __BUG(__file, __line, __value)              \
do {                                \
    asm volatile(BUG_INSTR_TYPE #__value);          \
    unreachable();                      \
} while (0)
#endif  /* CONFIG_DEBUG_BUGVERBOSE */

#define HAVE_ARCH_BUG
#endif  /* CONFIG_BUG */

#include <asm-generic/bug.h>

struct pt_regs;
void die(const char *msg, struct pt_regs *regs, int err);

struct siginfo;
void arm_notify_die(const char *str, struct pt_regs *regs, struct siginfo *info,
        unsigned long err, unsigned long trap);

#ifdef CONFIG_ARM_LPAE
#define FAULT_CODE_ALIGNMENT    33
#define FAULT_CODE_DEBUG    34
#else
#define FAULT_CODE_ALIGNMENT    1
#define FAULT_CODE_DEBUG    2
#endif

void hook_fault_code(int nr, int (*fn)(unsigned long, unsigned int,
                       struct pt_regs *),
             int sig, int code, const char *name);

void hook_ifault_code(int nr, int (*fn)(unsigned long, unsigned int,
                       struct pt_regs *),
             int sig, int code, const char *name);

extern asmlinkage void c_backtrace(unsigned long fp, int pmode);

struct mm_struct;
extern void show_pte(struct mm_struct *mm, unsigned long addr);
extern void __show_regs(struct pt_regs *);

#endif