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 93