| b.liu | e958203 | 2025-04-17 19:18:16 +0800 | [diff] [blame^] | 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 | //old: #define BUG() _BUG(__FILE__, __LINE__, BUG_INSTR_VALUE) |
| 24 | |
| 25 | #define BUG() do { \ |
| 26 | printk("BUG: failure at %s:%d/%s()!\n", __FILE__, __LINE__, __func__); \ |
| 27 | barrier_before_unreachable(); \ |
| 28 | _BUG(__FILE__, __LINE__, BUG_INSTR_VALUE); \ |
| 29 | } while (0) |
| 30 | |
| 31 | #define _BUG(file, line, value) __BUG(file, line, value) |
| 32 | |
| 33 | #ifdef CONFIG_DEBUG_BUGVERBOSE |
| 34 | |
| 35 | /* |
| 36 | * The extra indirection is to ensure that the __FILE__ string comes through |
| 37 | * OK. Many version of gcc do not support the asm %c parameter which would be |
| 38 | * preferable to this unpleasantness. We use mergeable string sections to |
| 39 | * avoid multiple copies of the string appearing in the kernel image. |
| 40 | */ |
| 41 | |
| 42 | #define __BUG(__file, __line, __value) \ |
| 43 | do { \ |
| 44 | asm volatile("1:\t" BUG_INSTR(__value) "\n" \ |
| 45 | ".pushsection .rodata.str, \"aMS\", %progbits, 1\n" \ |
| 46 | "2:\t.asciz " #__file "\n" \ |
| 47 | ".popsection\n" \ |
| 48 | ".pushsection __bug_table,\"aw\"\n" \ |
| 49 | ".align 2\n" \ |
| 50 | "3:\t.word 1b, 2b\n" \ |
| 51 | "\t.hword " #__line ", 0\n" \ |
| 52 | ".popsection"); \ |
| 53 | unreachable(); \ |
| 54 | } while (0) |
| 55 | |
| 56 | #else |
| 57 | |
| 58 | #define __BUG(__file, __line, __value) \ |
| 59 | do { \ |
| 60 | asm volatile(BUG_INSTR(__value) "\n"); \ |
| 61 | unreachable(); \ |
| 62 | } while (0) |
| 63 | #endif /* CONFIG_DEBUG_BUGVERBOSE */ |
| 64 | |
| 65 | #define HAVE_ARCH_BUG |
| 66 | |
| 67 | #include <asm-generic/bug.h> |
| 68 | |
| 69 | struct pt_regs; |
| 70 | void die(const char *msg, struct pt_regs *regs, int err); |
| 71 | |
| 72 | void arm_notify_die(const char *str, struct pt_regs *regs, |
| 73 | int signo, int si_code, void __user *addr, |
| 74 | unsigned long err, unsigned long trap); |
| 75 | |
| 76 | #ifdef CONFIG_ARM_LPAE |
| 77 | #define FAULT_CODE_ALIGNMENT 33 |
| 78 | #define FAULT_CODE_DEBUG 34 |
| 79 | #else |
| 80 | #define FAULT_CODE_ALIGNMENT 1 |
| 81 | #define FAULT_CODE_DEBUG 2 |
| 82 | #endif |
| 83 | |
| 84 | void hook_fault_code(int nr, int (*fn)(unsigned long, unsigned int, |
| 85 | struct pt_regs *), |
| 86 | int sig, int code, const char *name); |
| 87 | |
| 88 | void hook_ifault_code(int nr, int (*fn)(unsigned long, unsigned int, |
| 89 | struct pt_regs *), |
| 90 | int sig, int code, const char *name); |
| 91 | |
| 92 | extern asmlinkage void c_backtrace(unsigned long fp, int pmode); |
| 93 | |
| 94 | struct mm_struct; |
| 95 | void show_pte(const char *lvl, struct mm_struct *mm, unsigned long addr); |
| 96 | extern void __show_regs(struct pt_regs *); |
| 97 | |
| 98 | #endif |