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:    PPC_LONG \addr, 5002f
  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:    PPC_LONG \addr
  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" PPC_LONG "1b, %0\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" PPC_LONG "1b\n"                  \
  47         "\t.short %2\n"                         \
  48         ".org 2b+%3\n"                          \
  49         ".previous\n"
  50 #endif
  51
  52 /*
  53  * BUG_ON() and WARN_ON() do their best to cooperate with compile-time
  54  * optimisations. However depending on the complexity of the condition
  55  * some compiler versions may not produce optimal results.
  56  */
  57
  58 #define BUG() do {                                              \
  59         __asm__ __volatile__(                                   \
  60                 "1:     twi 31,0,0\n"                           \
  61                 _EMIT_BUG_ENTRY                                 \
  62                 : : "i" (__FILE__), "i" (__LINE__),             \
  63                     "i" (0), "i"  (sizeof(struct bug_entry)));  \
  64         unreachable();                                          \
  65 } while (0)
  66
  67 #define BUG_ON(x) do {                                          \
  68         if (__builtin_constant_p(x)) {                          \
  69                 if (x)                                          \
  70                         BUG();                                  \
  71         } else {                                                \
  72                 __asm__ __volatile__(                           \
  73                 "1:     "PPC_TLNEI"     %4,0\n"                 \
  74                 _EMIT_BUG_ENTRY                                 \
  75                 : : "i" (__FILE__), "i" (__LINE__), "i" (0),    \
  76                   "i" (sizeof(struct bug_entry)),               \
  77                   "r" ((__force long)(x)));                     \
  78         }                                                       \
  79 } while (0)
  80
  81 #define __WARN_FLAGS(flags) do {                                \
  82         __asm__ __volatile__(                                   \
  83                 "1:     twi 31,0,0\n"                           \
  84                 _EMIT_BUG_ENTRY                                 \
  85                 : : "i" (__FILE__), "i" (__LINE__),             \
  86                   "i" (BUGFLAG_WARNING|(flags)),                \
  87                   "i" (sizeof(struct bug_entry)));              \
  88 } while (0)
  89
  90 #define WARN_ON(x) ({                                           \
  91         int __ret_warn_on = !!(x);                              \
  92         if (__builtin_constant_p(__ret_warn_on)) {              \
  93                 if (__ret_warn_on)                              \
  94                         __WARN();                               \
  95         } else {                                                \
  96                 __asm__ __volatile__(                           \
  97                 "1:     "PPC_TLNEI"     %4,0\n"                 \
  98                 _EMIT_BUG_ENTRY                                 \
  99                 : : "i" (__FILE__), "i" (__LINE__),             \
 100                   "i" (BUGFLAG_WARNING|BUGFLAG_TAINT(TAINT_WARN)),\
 101                   "i" (sizeof(struct bug_entry)),               \
 102                   "r" (__ret_warn_on));                         \
 103         }                                                       \
 104         unlikely(__ret_warn_on);                                \
 105 })
 106
 107 #define HAVE_ARCH_BUG
 108 #define HAVE_ARCH_BUG_ON
 109 #define HAVE_ARCH_WARN_ON
 110 #endif /* __ASSEMBLY __ */
 111 #else
 112 #ifdef __ASSEMBLY__
 113 .macro EMIT_BUG_ENTRY addr,file,line,flags
 114 .endm
 115 #else /* !__ASSEMBLY__ */
 116 #define _EMIT_BUG_ENTRY
 117 #endif
 118 #endif /* CONFIG_BUG */
 119
 120 #include <asm-generic/bug.h>
 121
 122 #ifndef __ASSEMBLY__
 123
 124 struct pt_regs;
 125 extern int do_page_fault(struct pt_regs *, unsigned long, unsigned long);
 126 extern void bad_page_fault(struct pt_regs *, unsigned long, int);
 127 extern void _exception(int, struct pt_regs *, int, unsigned long);
 128 extern void _exception_pkey(struct pt_regs *, unsigned long, int);
 129 extern void die(const char *, struct pt_regs *, long);
 130 extern bool die_will_crash(void);
 131 extern void panic_flush_kmsg_start(void);
 132 extern void panic_flush_kmsg_end(void);
 133 #endif /* !__ASSEMBLY__ */
 134
 135 #endif /* __KERNEL__ */
 136 #endif /* _ASM_POWERPC_BUG_H */