arch/powerpc/include/asm/bug.h

   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 - .
  17          .4byte 5002f - .
  18          .short \line, \flags
  19          .org 5001b+BUG_ENTRY_SIZE
  20          .previous
  21          .section .rodata,"a"
  22 5002:    .asciz "\file"
  23          .previous
  24 .endm
  25 #else
  26 .macro __EMIT_BUG_ENTRY addr,file,line,flags
  27          .section __bug_table,"aw"
  28 5001:    .4byte \addr - .
  29          .short \flags
  30          .org 5001b+BUG_ENTRY_SIZE
  31          .previous
  32 .endm
  33 #endif /* verbose */
  34
  35 .macro EMIT_WARN_ENTRY addr,file,line,flags
  36         EX_TABLE(\addr,\addr+4)
  37         __EMIT_BUG_ENTRY \addr,\file,\line,\flags
  38 .endm
  39
  40 .macro EMIT_BUG_ENTRY addr,file,line,flags
  41         .if \flags & 1 /* BUGFLAG_WARNING */
  42         .err /* Use EMIT_WARN_ENTRY for warnings */
  43         .endif
  44         __EMIT_BUG_ENTRY \addr,\file,\line,\flags
  45 .endm
  46
  47 #else /* !__ASSEMBLY__ */
  48 /* _EMIT_BUG_ENTRY expects args %0,%1,%2,%3 to be FILE, LINE, flags and
  49    sizeof(struct bug_entry), respectively */
  50 #ifdef CONFIG_DEBUG_BUGVERBOSE
  51 #define _EMIT_BUG_ENTRY                         \
  52         ".section __bug_table,\"aw\"\n"         \
  53         "2:     .4byte 1b - .\n"                \
  54         "       .4byte %0 - .\n"                \
  55         "       .short %1, %2\n"                \
  56         ".org 2b+%3\n"                          \
  57         ".previous\n"
  58 #else
  59 #define _EMIT_BUG_ENTRY                         \
  60         ".section __bug_table,\"aw\"\n"         \
  61         "2:     .4byte 1b - .\n"                \
  62         "       .short %2\n"                    \
  63         ".org 2b+%3\n"                          \
  64         ".previous\n"
  65 #endif
  66
  67 #define BUG_ENTRY(insn, flags, ...)                     \
  68         __asm__ __volatile__(                           \
  69                 "1:     " insn "\n"                     \
  70                 _EMIT_BUG_ENTRY                         \
  71                 : : "i" (__FILE__), "i" (__LINE__),     \
  72                   "i" (flags),                          \
  73                   "i" (sizeof(struct bug_entry)),       \
  74                   ##__VA_ARGS__)
  75
  76 #define WARN_ENTRY(insn, flags, label, ...)             \
  77         asm_volatile_goto(                              \
  78                 "1:     " insn "\n"                     \
  79                 EX_TABLE(1b, %l[label])                 \
  80                 _EMIT_BUG_ENTRY                         \
  81                 : : "i" (__FILE__), "i" (__LINE__),     \
  82                   "i" (flags),                          \
  83                   "i" (sizeof(struct bug_entry)),       \
  84                   ##__VA_ARGS__ : : label)
  85
  86 /*
  87  * BUG_ON() and WARN_ON() do their best to cooperate with compile-time
  88  * optimisations. However depending on the complexity of the condition
  89  * some compiler versions may not produce optimal results.
  90  */
  91
  92 #define BUG() do {                                              \
  93         BUG_ENTRY("twi 31, 0, 0", 0);                           \
  94         unreachable();                                          \
  95 } while (0)
  96 #define HAVE_ARCH_BUG
  97
  98 #define __WARN_FLAGS(flags) do {                                \
  99         __label__ __label_warn_on;                              \
 100                                                                 \
 101         WARN_ENTRY("twi 31, 0, 0", BUGFLAG_WARNING | (flags), __label_warn_on); \
 102         barrier_before_unreachable();                           \
 103         __builtin_unreachable();                                \
 104                                                                 \
 105 __label_warn_on:                                                \
 106         break;                                                  \
 107 } while (0)
 108
 109 #ifdef CONFIG_PPC64
 110 #define BUG_ON(x) do {                                          \
 111         if (__builtin_constant_p(x)) {                          \
 112                 if (x)                                          \
 113                         BUG();                                  \
 114         } else {                                                \
 115                 BUG_ENTRY(PPC_TLNEI " %4, 0", 0, "r" ((__force long)(x)));      \
 116         }                                                       \
 117 } while (0)
 118
 119 #define WARN_ON(x) ({                                           \
 120         bool __ret_warn_on = false;                             \
 121         do {                                                    \
 122                 if (__builtin_constant_p((x))) {                \
 123                         if (!(x))                               \
 124                                 break;                          \
 125                         __WARN();                               \
 126                         __ret_warn_on = true;                   \
 127                 } else {                                        \
 128                         __label__ __label_warn_on;              \
 129                                                                 \
 130                         WARN_ENTRY(PPC_TLNEI " %4, 0",          \
 131                                    BUGFLAG_WARNING | BUGFLAG_TAINT(TAINT_WARN), \
 132                                    __label_warn_on,             \
 133                                    "r" ((__force long)(x)));    \
 134                         break;                                  \
 135 __label_warn_on:                                                \
 136                         __ret_warn_on = true;                   \
 137                 }                                               \
 138         } while (0);                                            \
 139         unlikely(__ret_warn_on);                                \
 140 })
 141
 142 #define HAVE_ARCH_BUG_ON
 143 #define HAVE_ARCH_WARN_ON
 144 #endif
 145
 146 #endif /* __ASSEMBLY __ */
 147 #else
 148 #ifdef __ASSEMBLY__
 149 .macro EMIT_BUG_ENTRY addr,file,line,flags
 150 .endm
 151 .macro EMIT_WARN_ENTRY addr,file,line,flags
 152 .endm
 153 #else /* !__ASSEMBLY__ */
 154 #define _EMIT_BUG_ENTRY
 155 #define _EMIT_WARN_ENTRY
 156 #endif
 157 #endif /* CONFIG_BUG */
 158
 159 #include <asm-generic/bug.h>
 160
 161 #ifndef __ASSEMBLY__
 162
 163 struct pt_regs;
 164 void hash__do_page_fault(struct pt_regs *);
 165 void bad_page_fault(struct pt_regs *, int);
 166 extern void _exception(int, struct pt_regs *, int, unsigned long);
 167 extern void _exception_pkey(struct pt_regs *, unsigned long, int);
 168 extern void die(const char *, struct pt_regs *, long);
 169 void die_mce(const char *str, struct pt_regs *regs, long err);
 170 extern bool die_will_crash(void);
 171 extern void panic_flush_kmsg_start(void);
 172 extern void panic_flush_kmsg_end(void);
 173 #endif /* !__ASSEMBLY__ */
 174
 175 #endif /* __KERNEL__ */
 176 #endif /* _ASM_POWERPC_BUG_H */