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
   8 #ifdef CONFIG_BUG
   9
  10 #ifdef __ASSEMBLY__
  11 #include <asm/asm-offsets.h>
  12 #ifdef CONFIG_DEBUG_BUGVERBOSE
  13 .macro EMIT_BUG_ENTRY addr,file,line,flags
  14          .section __bug_table,"aw"
  15 5001:    .4byte \addr - .
  16          .4byte 5002f - .
  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 - .
  28          .short \flags
  29          .org 5001b+BUG_ENTRY_SIZE
  30          .previous
  31 .endm
  32 #endif /* verbose */
  33
  34 #else /* !__ASSEMBLY__ */
  35 /* _EMIT_BUG_ENTRY expects args %0,%1,%2,%3 to be FILE, LINE, flags and
  36    sizeof(struct bug_entry), respectively */
  37 #ifdef CONFIG_DEBUG_BUGVERBOSE
  38 #define _EMIT_BUG_ENTRY                         \
  39         ".section __bug_table,\"aw\"\n"         \
  40         "2:     .4byte 1b - .\n"                \
  41         "       .4byte %0 - .\n"                \
  42         "       .short %1, %2\n"                \
  43         ".org 2b+%3\n"                          \
  44         ".previous\n"
  45 #else
  46 #define _EMIT_BUG_ENTRY                         \
  47         ".section __bug_table,\"aw\"\n"         \
  48         "2:     .4byte 1b - .\n"                \
  49         "       .short %2\n"                    \
  50         ".org 2b+%3\n"                          \
  51         ".previous\n"
  52 #endif
  53
  54 #define BUG_ENTRY(insn, flags, ...)                     \
  55         __asm__ __volatile__(                           \
  56                 "1:     " insn "\n"                     \
  57                 _EMIT_BUG_ENTRY                         \
  58                 : : "i" (__FILE__), "i" (__LINE__),     \
  59                   "i" (flags),                          \
  60                   "i" (sizeof(struct bug_entry)),       \
  61                   ##__VA_ARGS__)
  62
  63 /*
  64  * BUG_ON() and WARN_ON() do their best to cooperate with compile-time
  65  * optimisations. However depending on the complexity of the condition
  66  * some compiler versions may not produce optimal results.
  67  */
  68
  69 #define BUG() do {                                              \
  70         BUG_ENTRY("twi 31, 0, 0", 0);                           \
  71         unreachable();                                          \
  72 } while (0)
  73 #define HAVE_ARCH_BUG
  74
  75 #define __WARN_FLAGS(flags) BUG_ENTRY("twi 31, 0, 0", BUGFLAG_WARNING | (flags))
  76
  77 #ifdef CONFIG_PPC64
  78 #define BUG_ON(x) do {                                          \
  79         if (__builtin_constant_p(x)) {                          \
  80                 if (x)                                          \
  81                         BUG();                                  \
  82         } else {                                                \
  83                 BUG_ENTRY(PPC_TLNEI " %4, 0", 0, "r" ((__force long)(x)));      \
  84         }                                                       \
  85 } while (0)
  86
  87 #define WARN_ON(x) ({                                           \
  88         int __ret_warn_on = !!(x);                              \
  89         if (__builtin_constant_p(__ret_warn_on)) {              \
  90                 if (__ret_warn_on)                              \
  91                         __WARN();                               \
  92         } else {                                                \
  93                 BUG_ENTRY(PPC_TLNEI " %4, 0",                   \
  94                           BUGFLAG_WARNING | BUGFLAG_TAINT(TAINT_WARN),  \
  95                           "r" (__ret_warn_on)); \
  96         }                                                       \
  97         unlikely(__ret_warn_on);                                \
  98 })
  99
 100 #define HAVE_ARCH_BUG_ON
 101 #define HAVE_ARCH_WARN_ON
 102 #endif
 103
 104 #endif /* __ASSEMBLY __ */
 105 #else
 106 #ifdef __ASSEMBLY__
 107 .macro EMIT_BUG_ENTRY addr,file,line,flags
 108 .endm
 109 #else /* !__ASSEMBLY__ */
 110 #define _EMIT_BUG_ENTRY
 111 #endif
 112 #endif /* CONFIG_BUG */
 113
 114 #define EMIT_WARN_ENTRY EMIT_BUG_ENTRY
 115
 116 #include <asm-generic/bug.h>
 117
 118 #ifndef __ASSEMBLY__
 119
 120 struct pt_regs;
 121 void hash__do_page_fault(struct pt_regs *);
 122 void bad_page_fault(struct pt_regs *, int);
 123 void emulate_single_step(struct pt_regs *regs);
 124 extern void _exception(int, struct pt_regs *, int, unsigned long);
 125 extern void _exception_pkey(struct pt_regs *, unsigned long, int);
 126 extern void die(const char *, struct pt_regs *, long);
 127 void die_mce(const char *str, struct pt_regs *regs, long err);
 128 extern bool die_will_crash(void);
 129 extern void panic_flush_kmsg_start(void);
 130 extern void panic_flush_kmsg_end(void);
 131 #endif /* !__ASSEMBLY__ */
 132
 133 #endif /* __KERNEL__ */
 134 #endif /* _ASM_POWERPC_BUG_H */