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

   1/* SPDX-License-Identifier: GPL-2.0 */
   2#ifndef _ASMARM_BUG_H
   3#define _ASMARM_BUG_H
   4
   5#include <linux/linkage.h>
   6#include <linux/types.h>
   7#include <asm/opcodes.h>
   8
   9/*
  10 * Use a suitable undefined instruction to use for ARM/Thumb2 bug handling.
  11 * We need to be careful not to conflict with those used by other modules and
  12 * the register_undef_hook() system.
  13 */
  14#ifdef CONFIG_THUMB2_KERNEL
  15#define BUG_INSTR_VALUE 0xde02
  16#define BUG_INSTR(__value) __inst_thumb16(__value)
  17#else
  18#define BUG_INSTR_VALUE 0xe7f001f2
  19#define BUG_INSTR(__value) __inst_arm(__value)
  20#endif
  21
  22
  23#define BUG() _BUG(__FILE__, __LINE__, BUG_INSTR_VALUE)
  24#define _BUG(file, line, value) __BUG(file, line, value)
  25
  26#ifdef CONFIG_DEBUG_BUGVERBOSE
  27
  28/*
  29 * The extra indirection is to ensure that the __FILE__ string comes through
  30 * OK. Many version of gcc do not support the asm %c parameter which would be
  31 * preferable to this unpleasantness. We use mergeable string sections to
  32 * avoid multiple copies of the string appearing in the kernel image.
  33 */
  34
  35#define __BUG(__file, __line, __value)                          \
  36do {                                                            \
  37        asm volatile("1:\t" BUG_INSTR(__value) "\n"  \
  38                ".pushsection .rodata.str, \"aMS\", %progbits, 1\n" \
  39                "2:\t.asciz " #__file "\n"                      \
  40                ".popsection\n"                                 \
  41                ".pushsection __bug_table,\"aw\"\n"             \
  42                ".align 2\n"                                    \
  43                "3:\t.word 1b, 2b\n"                            \
  44                "\t.hword " #__line ", 0\n"                     \
  45                ".popsection");                                 \
  46        unreachable();                                          \
  47} while (0)
  48
  49#else
  50
  51#define __BUG(__file, __line, __value)                          \
  52do {                                                            \
  53        asm volatile(BUG_INSTR(__value) "\n");                  \
  54        unreachable();                                          \
  55} while (0)
  56#endif  /* CONFIG_DEBUG_BUGVERBOSE */
  57
  58#define HAVE_ARCH_BUG
  59
  60#include <asm-generic/bug.h>
  61
  62struct pt_regs;
  63void die(const char *msg, struct pt_regs *regs, int err);
  64
  65void arm_notify_die(const char *str, struct pt_regs *regs,
  66                int signo, int si_code, void __user *addr,
  67                unsigned long err, unsigned long trap);
  68
  69#ifdef CONFIG_ARM_LPAE
  70#define FAULT_CODE_ALIGNMENT    33
  71#define FAULT_CODE_DEBUG        34
  72#else
  73#define FAULT_CODE_ALIGNMENT    1
  74#define FAULT_CODE_DEBUG        2
  75#endif
  76
  77void hook_fault_code(int nr, int (*fn)(unsigned long, unsigned int,
  78                                       struct pt_regs *),
  79                     int sig, int code, const char *name);
  80
  81void hook_ifault_code(int nr, int (*fn)(unsigned long, unsigned int,
  82                                       struct pt_regs *),
  83                     int sig, int code, const char *name);
  84
  85extern asmlinkage void c_backtrace(unsigned long fp, int pmode);
  86
  87struct mm_struct;
  88void show_pte(const char *lvl, struct mm_struct *mm, unsigned long addr);
  89extern void __show_regs(struct pt_regs *);
  90
  91#endif
  92