arch/sh/include/asm/bug.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef __ASM_SH_BUG_H
   3 #define __ASM_SH_BUG_H
   4
   5 #include <linux/linkage.h>
   6
   7 #define TRAPA_BUG_OPCODE        0xc33e  /* trapa #0x3e */
   8 #define BUGFLAG_UNWINDER        (1 << 1)
   9
  10 #ifdef CONFIG_GENERIC_BUG
  11 #define HAVE_ARCH_BUG
  12 #define HAVE_ARCH_WARN_ON
  13
  14 /**
  15  * _EMIT_BUG_ENTRY
  16  * %1 - __FILE__
  17  * %2 - __LINE__
  18  * %3 - trap type
  19  * %4 - sizeof(struct bug_entry)
  20  *
  21  * The trapa opcode itself sits in %0.
  22  * The %O notation is used to avoid # generation.
  23  *
  24  * The offending file and line are encoded in the __bug_table section.
  25  */
  26 #ifdef CONFIG_DEBUG_BUGVERBOSE
  27 #define _EMIT_BUG_ENTRY                         \
  28         "\t.pushsection __bug_table,\"aw\"\n"   \
  29         "2:\t.long 1b, %O1\n"                   \
  30         "\t.short %O2, %O3\n"                   \
  31         "\t.org 2b+%O4\n"                       \
  32         "\t.popsection\n"
  33 #else
  34 #define _EMIT_BUG_ENTRY                         \
  35         "\t.pushsection __bug_table,\"aw\"\n"   \
  36         "2:\t.long 1b\n"                        \
  37         "\t.short %O3\n"                        \
  38         "\t.org 2b+%O4\n"                       \
  39         "\t.popsection\n"
  40 #endif
  41
  42 #define BUG()                                           \
  43 do {                                                    \
  44         __asm__ __volatile__ (                          \
  45                 "1:\t.short %O0\n"                      \
  46                 _EMIT_BUG_ENTRY                         \
  47                  :                                      \
  48                  : "n" (TRAPA_BUG_OPCODE),              \
  49                    "i" (__FILE__),                      \
  50                    "i" (__LINE__), "i" (0),             \
  51                    "i" (sizeof(struct bug_entry)));     \
  52         unreachable();                                  \
  53 } while (0)
  54
  55 #define __WARN_FLAGS(flags)                             \
  56 do {                                                    \
  57         __asm__ __volatile__ (                          \
  58                 "1:\t.short %O0\n"                      \
  59                  _EMIT_BUG_ENTRY                        \
  60                  :                                      \
  61                  : "n" (TRAPA_BUG_OPCODE),              \
  62                    "i" (__FILE__),                      \
  63                    "i" (__LINE__),                      \
  64                    "i" (BUGFLAG_WARNING|(flags)),       \
  65                    "i" (sizeof(struct bug_entry)));     \
  66 } while (0)
  67
  68 #define WARN_ON(x) ({                                           \
  69         int __ret_warn_on = !!(x);                              \
  70         if (__builtin_constant_p(__ret_warn_on)) {              \
  71                 if (__ret_warn_on)                              \
  72                         __WARN();                               \
  73         } else {                                                \
  74                 if (unlikely(__ret_warn_on))                    \
  75                         __WARN();                               \
  76         }                                                       \
  77         unlikely(__ret_warn_on);                                \
  78 })
  79
  80 #define UNWINDER_BUG()                                  \
  81 do {                                                    \
  82         __asm__ __volatile__ (                          \
  83                 "1:\t.short %O0\n"                      \
  84                 _EMIT_BUG_ENTRY                         \
  85                  :                                      \
  86                  : "n" (TRAPA_BUG_OPCODE),              \
  87                    "i" (__FILE__),                      \
  88                    "i" (__LINE__),                      \
  89                    "i" (BUGFLAG_UNWINDER),              \
  90                    "i" (sizeof(struct bug_entry)));     \
  91 } while (0)
  92
  93 #define UNWINDER_BUG_ON(x) ({                                   \
  94         int __ret_unwinder_on = !!(x);                          \
  95         if (__builtin_constant_p(__ret_unwinder_on)) {          \
  96                 if (__ret_unwinder_on)                          \
  97                         UNWINDER_BUG();                         \
  98         } else {                                                \
  99                 if (unlikely(__ret_unwinder_on))                \
 100                         UNWINDER_BUG();                         \
 101         }                                                       \
 102         unlikely(__ret_unwinder_on);                            \
 103 })
 104
 105 #else
 106
 107 #define UNWINDER_BUG    BUG
 108 #define UNWINDER_BUG_ON BUG_ON
 109
 110 #endif /* CONFIG_GENERIC_BUG */
 111
 112 #include <asm-generic/bug.h>
 113
 114 struct pt_regs;
 115
 116 /* arch/sh/kernel/traps.c */
 117 extern void die(const char *str, struct pt_regs *regs, long err) __attribute__ ((noreturn));
 118 extern void die_if_kernel(const char *str, struct pt_regs *regs, long err);
 119 extern void die_if_no_fixup(const char *str, struct pt_regs *regs, long err);
 120
 121 #endif /* __ASM_SH_BUG_H */