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                 "3:\t.word 1b, 2b\n"                            \
  44                 "\t.hword " #__line ", 0\n"                     \
  45                 ".popsection");                                 \
  46         unreachable();                                          \
  47 } while (0)
  48
  49 #else  /* not CONFIG_DEBUG_BUGVERBOSE */
  50
  51 #define __BUG(__file, __line, __value)                          \
  52 do {                                                            \
  53         asm volatile(BUG_INSTR(__value) "\n");                  \
  54         unreachable();                                          \
  55 } while (0)
  56 #endif  /* CONFIG_DEBUG_BUGVERBOSE */
  57
  58 #define HAVE_ARCH_BUG
  59 #endif  /* CONFIG_BUG */
  60
  61 #include <asm-generic/bug.h>
  62
  63 struct pt_regs;
  64 void die(const char *msg, struct pt_regs *regs, int err);
  65
  66 struct siginfo;
  67 void arm_notify_die(const char *str, struct pt_regs *regs, struct siginfo *info,
  68                 unsigned long err, unsigned long trap);
  69
  70 #ifdef CONFIG_ARM_LPAE
  71 #define FAULT_CODE_ALIGNMENT    33
  72 #define FAULT_CODE_DEBUG        34
  73 #else
  74 #define FAULT_CODE_ALIGNMENT    1
  75 #define FAULT_CODE_DEBUG        2
  76 #endif
  77
  78 void hook_fault_code(int nr, int (*fn)(unsigned long, unsigned int,
  79                                        struct pt_regs *),
  80                      int sig, int code, const char *name);
  81
  82 void hook_ifault_code(int nr, int (*fn)(unsigned long, unsigned int,
  83                                        struct pt_regs *),
  84                      int sig, int code, const char *name);
  85
  86 extern asmlinkage void c_backtrace(unsigned long fp, int pmode);
  87
  88 struct mm_struct;
  89 extern void show_pte(struct mm_struct *mm, unsigned long addr);
  90 extern void __show_regs(struct pt_regs *);
  91
  92 #endif