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 */ 122