include/asm/bug.h

0001 /* SPDX-License-Identifier: GPL-2.0 */
0002 #ifndef _ASM_POWERPC_BUG_H
0003 #define _ASM_POWERPC_BUG_H
0004 #ifdef __KERNEL__
0005
0006 #include <asm/asm-compat.h>
0007 #include <asm/extable.h>
0008
0009 #ifdef CONFIG_BUG
0010
0011 #ifdef __ASSEMBLY__
0012 #include <asm/asm-offsets.h>
0013 #ifdef CONFIG_DEBUG_BUGVERBOSE
0014 .macro __EMIT_BUG_ENTRY addr,file,line,flags
0015      .section __bug_table,"aw"
0016 5001:    .4byte \addr - .
0017      .4byte 5002f - .
0018      .short \line, \flags
0019      .org 5001b+BUG_ENTRY_SIZE
0020      .previous
0021      .section .rodata,"a"
0022 5002:    .asciz "\file"
0023      .previous
0024 .endm
0025 #else
0026 .macro __EMIT_BUG_ENTRY addr,file,line,flags
0027      .section __bug_table,"aw"
0028 5001:    .4byte \addr - .
0029      .short \flags
0030      .org 5001b+BUG_ENTRY_SIZE
0031      .previous
0032 .endm
0033 #endif /* verbose */
0034
0035 .macro EMIT_WARN_ENTRY addr,file,line,flags
0036     EX_TABLE(\addr,\addr+4)
0037     __EMIT_BUG_ENTRY \addr,\file,\line,\flags
0038 .endm
0039
0040 .macro EMIT_BUG_ENTRY addr,file,line,flags
0041     .if \flags & 1 /* BUGFLAG_WARNING */
0042     .err /* Use EMIT_WARN_ENTRY for warnings */
0043     .endif
0044     __EMIT_BUG_ENTRY \addr,\file,\line,\flags
0045 .endm
0046
0047 #else /* !__ASSEMBLY__ */
0048 /* _EMIT_BUG_ENTRY expects args %0,%1,%2,%3 to be FILE, LINE, flags and
0049    sizeof(struct bug_entry), respectively */
0050 #ifdef CONFIG_DEBUG_BUGVERBOSE
0051 #define _EMIT_BUG_ENTRY             \
0052     ".section __bug_table,\"aw\"\n"     \
0053     "2: .4byte 1b - .\n"        \
0054     "   .4byte %0 - .\n"        \
0055     "   .short %1, %2\n"        \
0056     ".org 2b+%3\n"              \
0057     ".previous\n"
0058 #else
0059 #define _EMIT_BUG_ENTRY             \
0060     ".section __bug_table,\"aw\"\n"     \
0061     "2: .4byte 1b - .\n"        \
0062     "   .short %2\n"            \
0063     ".org 2b+%3\n"              \
0064     ".previous\n"
0065 #endif
0066
0067 #define BUG_ENTRY(insn, flags, ...)         \
0068     __asm__ __volatile__(               \
0069         "1: " insn "\n"         \
0070         _EMIT_BUG_ENTRY             \
0071         : : "i" (__FILE__), "i" (__LINE__), \
0072           "i" (flags),              \
0073           "i" (sizeof(struct bug_entry)),   \
0074           ##__VA_ARGS__)
0075
0076 #define WARN_ENTRY(insn, flags, label, ...)     \
0077     asm_volatile_goto(              \
0078         "1: " insn "\n"         \
0079         EX_TABLE(1b, %l[label])         \
0080         _EMIT_BUG_ENTRY             \
0081         : : "i" (__FILE__), "i" (__LINE__), \
0082           "i" (flags),              \
0083           "i" (sizeof(struct bug_entry)),   \
0084           ##__VA_ARGS__ : : label)
0085
0086 /*
0087  * BUG_ON() and WARN_ON() do their best to cooperate with compile-time
0088  * optimisations. However depending on the complexity of the condition
0089  * some compiler versions may not produce optimal results.
0090  */
0091
0092 #define BUG() do {                      \
0093     BUG_ENTRY("twi 31, 0, 0", 0);               \
0094     unreachable();                      \
0095 } while (0)
0096 #define HAVE_ARCH_BUG
0097
0098 #define __WARN_FLAGS(flags) do {                \
0099     __label__ __label_warn_on;              \
0100                                 \
0101     WARN_ENTRY("twi 31, 0, 0", BUGFLAG_WARNING | (flags), __label_warn_on); \
0102     unreachable();                      \
0103                                 \
0104 __label_warn_on:                        \
0105     break;                          \
0106 } while (0)
0107
0108 #ifdef CONFIG_PPC64
0109 #define BUG_ON(x) do {                      \
0110     if (__builtin_constant_p(x)) {              \
0111         if (x)                      \
0112             BUG();                  \
0113     } else {                        \
0114         BUG_ENTRY(PPC_TLNEI " %4, 0", 0, "r" ((__force long)(x)));  \
0115     }                           \
0116 } while (0)
0117
0118 #define WARN_ON(x) ({                       \
0119     bool __ret_warn_on = false;             \
0120     do {                            \
0121         if (__builtin_constant_p((x))) {        \
0122             if (!(x))               \
0123                 break;              \
0124             __WARN();               \
0125             __ret_warn_on = true;           \
0126         } else {                    \
0127             __label__ __label_warn_on;      \
0128                                 \
0129             WARN_ENTRY(PPC_TLNEI " %4, 0",      \
0130                    BUGFLAG_WARNING | BUGFLAG_TAINT(TAINT_WARN), \
0131                    __label_warn_on,     \
0132                    "r" ((__force long)(x)));    \
0133             break;                  \
0134 __label_warn_on:                        \
0135             __ret_warn_on = true;           \
0136         }                       \
0137     } while (0);                        \
0138     unlikely(__ret_warn_on);                \
0139 })
0140
0141 #define HAVE_ARCH_BUG_ON
0142 #define HAVE_ARCH_WARN_ON
0143 #endif
0144
0145 #endif /* __ASSEMBLY __ */
0146 #else
0147 #ifdef __ASSEMBLY__
0148 .macro EMIT_BUG_ENTRY addr,file,line,flags
0149 .endm
0150 .macro EMIT_WARN_ENTRY addr,file,line,flags
0151 .endm
0152 #else /* !__ASSEMBLY__ */
0153 #define _EMIT_BUG_ENTRY
0154 #define _EMIT_WARN_ENTRY
0155 #endif
0156 #endif /* CONFIG_BUG */
0157
0158 #include <asm-generic/bug.h>
0159
0160 #ifndef __ASSEMBLY__
0161
0162 struct pt_regs;
0163 void hash__do_page_fault(struct pt_regs *);
0164 void bad_page_fault(struct pt_regs *, int);
0165 extern void _exception(int, struct pt_regs *, int, unsigned long);
0166 extern void _exception_pkey(struct pt_regs *, unsigned long, int);
0167 extern void die(const char *, struct pt_regs *, long);
0168 void die_mce(const char *str, struct pt_regs *regs, long err);
0169 extern bool die_will_crash(void);
0170 extern void panic_flush_kmsg_start(void);
0171 extern void panic_flush_kmsg_end(void);
0172 #endif /* !__ASSEMBLY__ */
0173
0174 #endif /* __KERNEL__ */
0175 #endif /* _ASM_POWERPC_BUG_H */