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