| Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame^] | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
| 2 | #ifndef __ASM_SH_BUG_H |
| 3 | #define __ASM_SH_BUG_H |
| 4 | |
| 5 | #include <linux/linkage.h> |
| 6 | |
| 7 | #define TRAPA_BUG_OPCODE 0xc33e /* trapa #0x3e */ |
| 8 | #define BUGFLAG_UNWINDER (1 << 1) |
| 9 | |
| 10 | #ifdef CONFIG_GENERIC_BUG |
| 11 | #define HAVE_ARCH_BUG |
| 12 | #define HAVE_ARCH_WARN_ON |
| 13 | |
| 14 | /** |
| 15 | * _EMIT_BUG_ENTRY |
| 16 | * %1 - __FILE__ |
| 17 | * %2 - __LINE__ |
| 18 | * %3 - trap type |
| 19 | * %4 - sizeof(struct bug_entry) |
| 20 | * |
| 21 | * The trapa opcode itself sits in %0. |
| 22 | * The %O notation is used to avoid # generation. |
| 23 | * |
| 24 | * The offending file and line are encoded in the __bug_table section. |
| 25 | */ |
| 26 | #ifdef CONFIG_DEBUG_BUGVERBOSE |
| 27 | #define _EMIT_BUG_ENTRY \ |
| 28 | "\t.pushsection __bug_table,\"aw\"\n" \ |
| 29 | "2:\t.long 1b, %O1\n" \ |
| 30 | "\t.short %O2, %O3\n" \ |
| 31 | "\t.org 2b+%O4\n" \ |
| 32 | "\t.popsection\n" |
| 33 | #else |
| 34 | #define _EMIT_BUG_ENTRY \ |
| 35 | "\t.pushsection __bug_table,\"aw\"\n" \ |
| 36 | "2:\t.long 1b\n" \ |
| 37 | "\t.short %O3\n" \ |
| 38 | "\t.org 2b+%O4\n" \ |
| 39 | "\t.popsection\n" |
| 40 | #endif |
| 41 | |
| 42 | #define BUG() \ |
| 43 | do { \ |
| 44 | __asm__ __volatile__ ( \ |
| 45 | "1:\t.short %O0\n" \ |
| 46 | _EMIT_BUG_ENTRY \ |
| 47 | : \ |
| 48 | : "n" (TRAPA_BUG_OPCODE), \ |
| 49 | "i" (__FILE__), \ |
| 50 | "i" (__LINE__), "i" (0), \ |
| 51 | "i" (sizeof(struct bug_entry))); \ |
| 52 | unreachable(); \ |
| 53 | } while (0) |
| 54 | |
| 55 | #define __WARN_FLAGS(flags) \ |
| 56 | do { \ |
| 57 | __asm__ __volatile__ ( \ |
| 58 | "1:\t.short %O0\n" \ |
| 59 | _EMIT_BUG_ENTRY \ |
| 60 | : \ |
| 61 | : "n" (TRAPA_BUG_OPCODE), \ |
| 62 | "i" (__FILE__), \ |
| 63 | "i" (__LINE__), \ |
| 64 | "i" (BUGFLAG_WARNING|(flags)), \ |
| 65 | "i" (sizeof(struct bug_entry))); \ |
| 66 | } while (0) |
| 67 | |
| 68 | #define WARN_ON(x) ({ \ |
| 69 | int __ret_warn_on = !!(x); \ |
| 70 | if (__builtin_constant_p(__ret_warn_on)) { \ |
| 71 | if (__ret_warn_on) \ |
| 72 | __WARN(); \ |
| 73 | } else { \ |
| 74 | if (unlikely(__ret_warn_on)) \ |
| 75 | __WARN(); \ |
| 76 | } \ |
| 77 | unlikely(__ret_warn_on); \ |
| 78 | }) |
| 79 | |
| 80 | #define UNWINDER_BUG() \ |
| 81 | do { \ |
| 82 | __asm__ __volatile__ ( \ |
| 83 | "1:\t.short %O0\n" \ |
| 84 | _EMIT_BUG_ENTRY \ |
| 85 | : \ |
| 86 | : "n" (TRAPA_BUG_OPCODE), \ |
| 87 | "i" (__FILE__), \ |
| 88 | "i" (__LINE__), \ |
| 89 | "i" (BUGFLAG_UNWINDER), \ |
| 90 | "i" (sizeof(struct bug_entry))); \ |
| 91 | } while (0) |
| 92 | |
| 93 | #define UNWINDER_BUG_ON(x) ({ \ |
| 94 | int __ret_unwinder_on = !!(x); \ |
| 95 | if (__builtin_constant_p(__ret_unwinder_on)) { \ |
| 96 | if (__ret_unwinder_on) \ |
| 97 | UNWINDER_BUG(); \ |
| 98 | } else { \ |
| 99 | if (unlikely(__ret_unwinder_on)) \ |
| 100 | UNWINDER_BUG(); \ |
| 101 | } \ |
| 102 | unlikely(__ret_unwinder_on); \ |
| 103 | }) |
| 104 | |
| 105 | #else |
| 106 | |
| 107 | #define UNWINDER_BUG BUG |
| 108 | #define UNWINDER_BUG_ON BUG_ON |
| 109 | |
| 110 | #endif /* CONFIG_GENERIC_BUG */ |
| 111 | |
| 112 | #include <asm-generic/bug.h> |
| 113 | |
| 114 | struct pt_regs; |
| 115 | |
| 116 | /* arch/sh/kernel/traps.c */ |
| 117 | extern void die(const char *str, struct pt_regs *regs, long err) __attribute__ ((noreturn)); |
| 118 | extern void die_if_kernel(const char *str, struct pt_regs *regs, long err); |
| 119 | extern void die_if_no_fixup(const char *str, struct pt_regs *regs, long err); |
| 120 | |
| 121 | #endif /* __ASM_SH_BUG_H */ |