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