LXR linux/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()                                           \
  43do {                                                    \
  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)                             \
  56do {                                                    \
  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()                                  \
  81do {                                                    \
  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
 114struct pt_regs;
 115
 116/* arch/sh/kernel/traps.c */
 117extern void die(const char *str, struct pt_regs *regs, long err) __attribute__ ((noreturn));
 118extern void die_if_kernel(const char *str, struct pt_regs *regs, long err);
 119extern void die_if_no_fixup(const char *str, struct pt_regs *regs, long err);
 120
 121#endif /* __ASM_SH_BUG_H */
 122