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) \ 36 do { \ 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) \ 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 60 #include <asm-generic/bug.h> 61 62 struct pt_regs; 63 void die(const char *msg, struct pt_regs *regs, int err); 64 65 void 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 77 void hook_fault_code(int nr, int (*fn)(unsigned long, unsigned int, 78 struct pt_regs *), 79 int sig, int code, const char *name); 80 81 void hook_ifault_code(int nr, int (*fn)(unsigned long, unsigned int, 82 struct pt_regs *), 83 int sig, int code, const char *name); 84 85 extern asmlinkage void c_backtrace(unsigned long fp, int pmode, 86 const char *loglvl); 87 88 struct mm_struct; 89 void show_pte(const char *lvl, struct mm_struct *mm, unsigned long addr); 90 extern void __show_regs(struct pt_regs *); 91 extern void __show_regs_alloc_free(struct pt_regs *regs); 92 93 #endif 94