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 - 5001b, 5002f - 5001b
  16          .short \line, \flags
  17          .org 5001b+BUG_ENTRY_SIZE
  18          .previous
  19          .section .rodata,"a"
  20 5002:    .asciz "\file"
  21          .previous
  22 .endm
  23 #else
  24 .macro EMIT_BUG_ENTRY addr,file,line,flags
  25          .section __bug_table,"aw"
  26 5001:    .4byte \addr - 5001b
  27          .short \flags
  28          .org 5001b+BUG_ENTRY_SIZE
  29          .previous
  30 .endm
  31 #endif /* verbose */
  32
  33 #else /* !__ASSEMBLY__ */
  34 /* _EMIT_BUG_ENTRY expects args %0,%1,%2,%3 to be FILE, LINE, flags and
  35    sizeof(struct bug_entry), respectively */
  36 #ifdef CONFIG_DEBUG_BUGVERBOSE
  37 #define _EMIT_BUG_ENTRY                         \
  38         ".section __bug_table,\"aw\"\n"         \
  39         "2:\t.4byte 1b - 2b, %0 - 2b\n"         \
  40         "\t.short %1, %2\n"                     \
  41         ".org 2b+%3\n"                          \
  42         ".previous\n"
  43 #else
  44 #define _EMIT_BUG_ENTRY                         \
  45         ".section __bug_table,\"aw\"\n"         \
  46         "2:\t.4byte 1b - 2b\n"                  \
  47         "\t.short %2\n"                         \
  48         ".org 2b+%3\n"                          \
  49         ".previous\n"
  50 #endif
  51
  52 #define BUG_ENTRY(insn, flags, ...)                     \
  53         __asm__ __volatile__(                           \
  54                 "1:     " insn "\n"                     \
  55                 _EMIT_BUG_ENTRY                         \
  56                 : : "i" (__FILE__), "i" (__LINE__),     \
  57                   "i" (flags),                          \
  58                   "i" (sizeof(struct bug_entry)),       \
  59                   ##__VA_ARGS__)
  60
  61 /*
  62  * BUG_ON() and WARN_ON() do their best to cooperate with compile-time
  63  * optimisations. However depending on the complexity of the condition
  64  * some compiler versions may not produce optimal results.
  65  */
  66
  67 #define BUG() do {                                              \
  68         BUG_ENTRY("twi 31, 0, 0", 0);                           \
  69         unreachable();                                          \
  70 } while (0)
  71
  72 #define BUG_ON(x) do {                                          \
  73         if (__builtin_constant_p(x)) {                          \
  74                 if (x)                                          \
  75                         BUG();                                  \
  76         } else {                                                \
  77                 BUG_ENTRY(PPC_TLNEI " %4, 0", 0, "r" ((__force long)(x)));      \
  78         }                                                       \
  79 } while (0)
  80
  81 #define __WARN_FLAGS(flags) BUG_ENTRY("twi 31, 0, 0", BUGFLAG_WARNING | (flags))
  82
  83 #define WARN_ON(x) ({                                           \
  84         int __ret_warn_on = !!(x);                              \
  85         if (__builtin_constant_p(__ret_warn_on)) {              \
  86                 if (__ret_warn_on)                              \
  87                         __WARN();                               \
  88         } else {                                                \
  89                 BUG_ENTRY(PPC_TLNEI " %4, 0",                   \
  90                           BUGFLAG_WARNING | BUGFLAG_TAINT(TAINT_WARN),  \
  91                           "r" (__ret_warn_on)); \
  92         }                                                       \
  93         unlikely(__ret_warn_on);                                \
  94 })
  95
  96 #define HAVE_ARCH_BUG
  97 #define HAVE_ARCH_BUG_ON
  98 #define HAVE_ARCH_WARN_ON
  99 #endif /* __ASSEMBLY __ */
 100 #else
 101 #ifdef __ASSEMBLY__
 102 .macro EMIT_BUG_ENTRY addr,file,line,flags
 103 .endm
 104 #else /* !__ASSEMBLY__ */
 105 #define _EMIT_BUG_ENTRY
 106 #endif
 107 #endif /* CONFIG_BUG */
 108
 109 #include <asm-generic/bug.h>
 110
 111 #ifndef __ASSEMBLY__
 112
 113 struct pt_regs;
 114 void hash__do_page_fault(struct pt_regs *);
 115 void bad_page_fault(struct pt_regs *, int);
 116 extern void _exception(int, struct pt_regs *, int, unsigned long);
 117 extern void _exception_pkey(struct pt_regs *, unsigned long, int);
 118 extern void die(const char *, struct pt_regs *, long);
 119 void die_mce(const char *str, struct pt_regs *regs, long err);
 120 extern bool die_will_crash(void);
 121 extern void panic_flush_kmsg_start(void);
 122 extern void panic_flush_kmsg_end(void);
 123 #endif /* !__ASSEMBLY__ */
 124
 125 #endif /* __KERNEL__ */
 126 #endif /* _ASM_POWERPC_BUG_H */