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 91