1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef _ASM_POWERPC_BUG_H 3 #define _ASM_POWERPC_BUG_H 4 #ifdef __KERNEL__ 5 6 #include <asm/asm-compat.h> 7 #include <asm/extable.h> 8 9 #ifdef CONFIG_BUG 10 11 #ifdef __ASSEMBLY__ 12 #include <asm/asm-offsets.h> 13 #ifdef CONFIG_DEBUG_BUGVERBOSE 14 .macro EMIT_BUG_ENTRY addr,file,line,flags 15 .section __bug_table,"aw" 16 5001: .4byte \addr - 5001b, 5002f - 5001b 17 .short \line, \flags 18 .org 5001b+BUG_ENTRY_SIZE 19 .previous 20 .section .rodata,"a" 21 5002: .asciz "\file" 22 .previous 23 .endm 24 #else 25 .macro EMIT_BUG_ENTRY addr,file,line,flags 26 .section __bug_table,"aw" 27 5001: .4byte \addr - 5001b 28 .short \flags 29 .org 5001b+BUG_ENTRY_SIZE 30 .previous 31 .endm 32 #endif /* verbose */ 33 34 .macro EMIT_WARN_ENTRY addr,file,line,flags 35 EX_TABLE(\addr,\addr+4) 36 EMIT_BUG_ENTRY \addr,\file,\line,\flags 37 .endm 38 39 #else /* !__ASSEMBLY__ */ 40 /* _EMIT_BUG_ENTRY expects args %0,%1,%2,%3 to be FILE, LINE, flags and 41 sizeof(struct bug_entry), respectively */ 42 #ifdef CONFIG_DEBUG_BUGVERBOSE 43 #define _EMIT_BUG_ENTRY \ 44 ".section __bug_table,\"aw\"\n" \ 45 "2:\t.4byte 1b - 2b, %0 - 2b\n" \ 46 "\t.short %1, %2\n" \ 47 ".org 2b+%3\n" \ 48 ".previous\n" 49 #else 50 #define _EMIT_BUG_ENTRY \ 51 ".section __bug_table,\"aw\"\n" \ 52 "2:\t.4byte 1b - 2b\n" \ 53 "\t.short %2\n" \ 54 ".org 2b+%3\n" \ 55 ".previous\n" 56 #endif 57 58 #define BUG_ENTRY(insn, flags, ...) \ 59 __asm__ __volatile__( \ 60 "1: " insn "\n" \ 61 _EMIT_BUG_ENTRY \ 62 : : "i" (__FILE__), "i" (__LINE__), \ 63 "i" (flags), \ 64 "i" (sizeof(struct bug_entry)), \ 65 ##__VA_ARGS__) 66 67 #define WARN_ENTRY(insn, flags, label, ...) \ 68 asm_volatile_goto( \ 69 "1: " insn "\n" \ 70 EX_TABLE(1b, %l[label]) \ 71 _EMIT_BUG_ENTRY \ 72 : : "i" (__FILE__), "i" (__LINE__), \ 73 "i" (flags), \ 74 "i" (sizeof(struct bug_entry)), \ 75 ##__VA_ARGS__ : : label) 76 77 /* 78 * BUG_ON() and WARN_ON() do their best to cooperate with compile-time 79 * optimisations. However depending on the complexity of the condition 80 * some compiler versions may not produce optimal results. 81 */ 82 83 #define BUG() do { \ 84 BUG_ENTRY("twi 31, 0, 0", 0); \ 85 unreachable(); \ 86 } while (0) 87 #define HAVE_ARCH_BUG 88 89 #define __WARN_FLAGS(flags) do { \ 90 __label__ __label_warn_on; \ 91 \ 92 WARN_ENTRY("twi 31, 0, 0", BUGFLAG_WARNING | (flags), __label_warn_on); \ 93 unreachable(); \ 94 \ 95 __label_warn_on: \ 96 break; \ 97 } while (0) 98 99 #ifdef CONFIG_PPC64 100 #define BUG_ON(x) do { \ 101 if (__builtin_constant_p(x)) { \ 102 if (x) \ 103 BUG(); \ 104 } else { \ 105 BUG_ENTRY(PPC_TLNEI " %4, 0", 0, "r" ((__force long)(x))); \ 106 } \ 107 } while (0) 108 109 #define WARN_ON(x) ({ \ 110 bool __ret_warn_on = false; \ 111 do { \ 112 if (__builtin_constant_p((x))) { \ 113 if (!(x)) \ 114 break; \ 115 __WARN(); \ 116 __ret_warn_on = true; \ 117 } else { \ 118 __label__ __label_warn_on; \ 119 \ 120 WARN_ENTRY(PPC_TLNEI " %4, 0", \ 121 BUGFLAG_WARNING | BUGFLAG_TAINT(TAINT_WARN), \ 122 __label_warn_on, \ 123 "r" ((__force long)(x))); \ 124 break; \ 125 __label_warn_on: \ 126 __ret_warn_on = true; \ 127 } \ 128 } while (0); \ 129 unlikely(__ret_warn_on); \ 130 }) 131 132 #define HAVE_ARCH_BUG_ON 133 #define HAVE_ARCH_WARN_ON 134 #endif 135 136 #endif /* __ASSEMBLY __ */ 137 #else 138 #ifdef __ASSEMBLY__ 139 .macro EMIT_BUG_ENTRY addr,file,line,flags 140 .endm 141 .macro EMIT_WARN_ENTRY addr,file,line,flags 142 .endm 143 #else /* !__ASSEMBLY__ */ 144 #define _EMIT_BUG_ENTRY 145 #define _EMIT_WARN_ENTRY 146 #endif 147 #endif /* CONFIG_BUG */ 148 149 #include <asm-generic/bug.h> 150 151 #ifndef __ASSEMBLY__ 152 153 struct pt_regs; 154 void hash__do_page_fault(struct pt_regs *); 155 void bad_page_fault(struct pt_regs *, int); 156 extern void _exception(int, struct pt_regs *, int, unsigned long); 157 extern void _exception_pkey(struct pt_regs *, unsigned long, int); 158 extern void die(const char *, struct pt_regs *, long); 159 void die_mce(const char *str, struct pt_regs *regs, long err); 160 extern bool die_will_crash(void); 161 extern void panic_flush_kmsg_start(void); 162 extern void panic_flush_kmsg_end(void); 163 #endif /* !__ASSEMBLY__ */ 164 165 #endif /* __KERNEL__ */ 166 #endif /* _ASM_POWERPC_BUG_H */ 167