arch/arm64/include/asm/bug.h

   1 /*
   2  * Copyright (C) 2015  ARM Limited
   3  * Author: Dave Martin <Dave.Martin@arm.com>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License version 2 as
   7  * published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  16  */
  17
  18 #ifndef _ARCH_ARM64_ASM_BUG_H
  19 #define _ARCH_ARM64_ASM_BUG_H
  20
  21 #include <asm/brk-imm.h>
  22
  23 #ifdef CONFIG_DEBUG_BUGVERBOSE
  24 #define _BUGVERBOSE_LOCATION(file, line) __BUGVERBOSE_LOCATION(file, line)
  25 #define __BUGVERBOSE_LOCATION(file, line)                               \
  26                 ".pushsection .rodata.str,\"aMS\",@progbits,1\n"        \
  27         "2:     .string \"" file "\"\n\t"                               \
  28                 ".popsection\n\t"                                       \
  29                                                                         \
  30                 ".long 2b - 0b\n\t"                                     \
  31                 ".short " #line "\n\t"
  32 #else
  33 #define _BUGVERBOSE_LOCATION(file, line)
  34 #endif
  35
  36 #ifdef CONFIG_GENERIC_BUG
  37
  38 #define __BUG_ENTRY(flags)                              \
  39                 ".pushsection __bug_table,\"aw\"\n\t"   \
  40                 ".align 2\n\t"                          \
  41         "0:     .long 1f - 0b\n\t"                      \
  42 _BUGVERBOSE_LOCATION(__FILE__, __LINE__)                \
  43                 ".short " #flags "\n\t"                 \
  44                 ".popsection\n"                         \
  45         "1:     "
  46 #else
  47 #define __BUG_ENTRY(flags) ""
  48 #endif
  49
  50 #define __BUG_FLAGS(flags)                              \
  51         asm volatile (                                  \
  52                 __BUG_ENTRY(flags)                      \
  53                 "brk %[imm]" :: [imm] "i" (BUG_BRK_IMM) \
  54         );
  55
  56
  57 #define BUG() do {                                      \
  58         __BUG_FLAGS(0);                                 \
  59         unreachable();                                  \
  60 } while (0)
  61
  62 #define __WARN_FLAGS(flags) __BUG_FLAGS(BUGFLAG_WARNING|(flags))
  63
  64 #define HAVE_ARCH_BUG
  65
  66 #include <asm-generic/bug.h>
  67
  68 #endif /* ! _ARCH_ARM64_ASM_BUG_H */