LXR linux/arch/arm/include/asm/bug.h

   1#ifndef _ASMARM_BUG_H
   2#define _ASMARM_BUG_H
   3
   4#include <linux/linkage.h>
   5
   6#ifdef CONFIG_BUG
   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_TYPE ".hword "
  16#else
  17#define BUG_INSTR_VALUE 0xe7f001f2
  18#define BUG_INSTR_TYPE ".word "
  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)                          \
  35do {                                                            \
  36        asm volatile("1:\t" BUG_INSTR_TYPE #__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                "3:\t.word 1b, 2b\n"                            \
  42                "\t.hword " #__line ", 0\n"                     \
  43                ".popsection");                                 \
  44        unreachable();                                          \
  45} while (0)
  46
  47#else  /* not CONFIG_DEBUG_BUGVERBOSE */
  48
  49#define __BUG(__file, __line, __value)                          \
  50do {                                                            \
  51        asm volatile(BUG_INSTR_TYPE #__value);                  \
  52        unreachable();                                          \
  53} while (0)
  54#endif  /* CONFIG_DEBUG_BUGVERBOSE */
  55
  56#define HAVE_ARCH_BUG
  57#endif  /* CONFIG_BUG */
  58
  59#include <asm-generic/bug.h>
  60
  61struct pt_regs;
  62void die(const char *msg, struct pt_regs *regs, int err);
  63
  64struct siginfo;
  65void 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
  76void hook_fault_code(int nr, int (*fn)(unsigned long, unsigned int,
  77                                       struct pt_regs *),
  78                     int sig, int code, const char *name);
  79
  80void hook_ifault_code(int nr, int (*fn)(unsigned long, unsigned int,
  81                                       struct pt_regs *),
  82                     int sig, int code, const char *name);
  83
  84extern asmlinkage void c_backtrace(unsigned long fp, int pmode);
  85
  86struct mm_struct;
  87extern void show_pte(struct mm_struct *mm, unsigned long addr);
  88extern void __show_regs(struct pt_regs *);
  89
  90#endif
  91