arch/arm/include/asm/bug.h

   1 #ifndef _ASMARM_BUG_H
   2 #define _ASMARM_BUG_H
   3
   4 #include <linux/linkage.h>
   5 #include <linux/types.h>
   6 #include <asm/opcodes.h>
   7
   8 #ifdef CONFIG_BUG
   9
  10 /*
  11  * Use a suitable undefined instruction to use for ARM/Thumb2 bug handling.
  12  * We need to be careful not to conflict with those used by other modules and
  13  * the register_undef_hook() system.
  14  */
  15 #ifdef CONFIG_THUMB2_KERNEL
  16 #define BUG_INSTR_VALUE 0xde02
  17 #define BUG_INSTR(__value) __inst_thumb16(__value)
  18 #else
  19 #define BUG_INSTR_VALUE 0xe7f001f2
  20 #define BUG_INSTR(__value) __inst_arm(__value)
  21 #endif
  22
  23
  24 #define BUG() _BUG(__FILE__, __LINE__, BUG_INSTR_VALUE)
  25 #define _BUG(file, line, value) __BUG(file, line, value)
  26
  27 #ifdef CONFIG_DEBUG_BUGVERBOSE
  28
  29 /*
  30  * The extra indirection is to ensure that the __FILE__ string comes through
  31  * OK. Many version of gcc do not support the asm %c parameter which would be
  32  * preferable to this unpleasantness. We use mergeable string sections to
  33  * avoid multiple copies of the string appearing in the kernel image.
  34  */
  35
  36 #define __BUG(__file, __line, __value)                          \
  37 do {                                                            \
  38         asm volatile("1:\t" BUG_INSTR(__value) "\n"  \
  39                 ".pushsection .rodata.str, \"aMS\", %progbits, 1\n" \
  40                 "2:\t.asciz " #__file "\n"                      \
  41                 ".popsection\n"                                 \
  42                 ".pushsection __bug_table,\"a\"\n"              \
  43                 ".align 2\n"                                    \
  44                 "3:\t.word 1b, 2b\n"                            \
  45                 "\t.hword " #__line ", 0\n"                     \
  46                 ".popsection");                                 \
  47         unreachable();                                          \
  48 } while (0)
  49
  50 #else  /* not CONFIG_DEBUG_BUGVERBOSE */
  51
  52 #define __BUG(__file, __line, __value)                          \
  53 do {                                                            \
  54         asm volatile(BUG_INSTR(__value) "\n");                  \
  55         unreachable();                                          \
  56 } while (0)
  57 #endif  /* CONFIG_DEBUG_BUGVERBOSE */
  58
  59 #define HAVE_ARCH_BUG
  60 #endif  /* CONFIG_BUG */
  61
  62 #include <asm-generic/bug.h>
  63
  64 struct pt_regs;
  65 void die(const char *msg, struct pt_regs *regs, int err);
  66
  67 struct siginfo;
  68 void arm_notify_die(const char *str, struct pt_regs *regs, struct siginfo *info,
  69                 unsigned long err, unsigned long trap);
  70
  71 #ifdef CONFIG_ARM_LPAE
  72 #define FAULT_CODE_ALIGNMENT    33
  73 #define FAULT_CODE_DEBUG        34
  74 #else
  75 #define FAULT_CODE_ALIGNMENT    1
  76 #define FAULT_CODE_DEBUG        2
  77 #endif
  78
  79 void hook_fault_code(int nr, int (*fn)(unsigned long, unsigned int,
  80                                        struct pt_regs *),
  81                      int sig, int code, const char *name);
  82
  83 void hook_ifault_code(int nr, int (*fn)(unsigned long, unsigned int,
  84                                        struct pt_regs *),
  85                      int sig, int code, const char *name);
  86
  87 extern asmlinkage void c_backtrace(unsigned long fp, int pmode);
  88
  89 struct mm_struct;
  90 extern void show_pte(struct mm_struct *mm, unsigned long addr);
  91 extern void __show_regs(struct pt_regs *);
  92
  93 #endif