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: .4byte \addr - .
16 .4byte 5002f - .
17 .short \line, \flags
18 .org 5001b+BUG_ENTRY_SIZE
19 .previous
20 .section .rodata,"a"
21 5002: .asciz "\file"
22 .previous
23 .endm
24 #else
25 .macro EMIT_BUG_ENTRY addr,file,line,flags
26 .section __bug_table,"aw"
27 5001: .4byte \addr - .
28 .short \flags
29 .org 5001b+BUG_ENTRY_SIZE
30 .previous
31 .endm
32 #endif /* verbose */
33
34 #else /* !__ASSEMBLY__ */
35 /* _EMIT_BUG_ENTRY expects args %0,%1,%2,%3 to be FILE, LINE, flags and
36 sizeof(struct bug_entry), respectively */
37 #ifdef CONFIG_DEBUG_BUGVERBOSE
38 #define _EMIT_BUG_ENTRY \
39 ".section __bug_table,\"aw\"\n" \
40 "2: .4byte 1b - .\n" \
41 " .4byte %0 - .\n" \
42 " .short %1, %2\n" \
43 ".org 2b+%3\n" \
44 ".previous\n"
45 #else
46 #define _EMIT_BUG_ENTRY \
47 ".section __bug_table,\"aw\"\n" \
48 "2: .4byte 1b - .\n" \
49 " .short %2\n" \
50 ".org 2b+%3\n" \
51 ".previous\n"
52 #endif
53
54 #define BUG_ENTRY(insn, flags, ...) \
55 __asm__ __volatile__( \
56 "1: " insn "\n" \
57 _EMIT_BUG_ENTRY \
58 : : "i" (__FILE__), "i" (__LINE__), \
59 "i" (flags), \
60 "i" (sizeof(struct bug_entry)), \
61 ##__VA_ARGS__)
62
63 /*
64 * BUG_ON() and WARN_ON() do their best to cooperate with compile-time
65 * optimisations. However depending on the complexity of the condition
66 * some compiler versions may not produce optimal results.
67 */
68
69 #define BUG() do { \
70 BUG_ENTRY("twi 31, 0, 0", 0); \
71 unreachable(); \
72 } while (0)
73 #define HAVE_ARCH_BUG
74
75 #define __WARN_FLAGS(flags) BUG_ENTRY("twi 31, 0, 0", BUGFLAG_WARNING | (flags))
76
77 #ifdef CONFIG_PPC64
78 #define BUG_ON(x) do { \
79 if (__builtin_constant_p(x)) { \
80 if (x) \
81 BUG(); \
82 } else { \
83 BUG_ENTRY(PPC_TLNEI " %4, 0", 0, "r" ((__force long)(x))); \
84 } \
85 } while (0)
86
87 #define WARN_ON(x) ({ \
88 int __ret_warn_on = !!(x); \
89 if (__builtin_constant_p(__ret_warn_on)) { \
90 if (__ret_warn_on) \
91 __WARN(); \
92 } else { \
93 BUG_ENTRY(PPC_TLNEI " %4, 0", \
94 BUGFLAG_WARNING | BUGFLAG_TAINT(TAINT_WARN), \
95 "r" (__ret_warn_on)); \
96 } \
97 unlikely(__ret_warn_on); \
98 })
99
100 #define HAVE_ARCH_BUG_ON
101 #define HAVE_ARCH_WARN_ON
102 #endif
103
104 #endif /* __ASSEMBLY __ */
105 #else
106 #ifdef __ASSEMBLY__
107 .macro EMIT_BUG_ENTRY addr,file,line,flags
108 .endm
109 #else /* !__ASSEMBLY__ */
110 #define _EMIT_BUG_ENTRY
111 #endif
112 #endif /* CONFIG_BUG */
113
114 #define EMIT_WARN_ENTRY EMIT_BUG_ENTRY
115
116 #include <asm-generic/bug.h>
117
118 #ifndef __ASSEMBLY__
119
120 struct pt_regs;
121 void hash__do_page_fault(struct pt_regs *);
122 void bad_page_fault(struct pt_regs *, int);
123 void emulate_single_step(struct pt_regs *regs);
124 extern void _exception(int, struct pt_regs *, int, unsigned long);
125 extern void _exception_pkey(struct pt_regs *, unsigned long, int);
126 extern void die(const char *, struct pt_regs *, long);
127 void die_mce(const char *str, struct pt_regs *regs, long err);
128 extern bool die_will_crash(void);
129 extern void panic_flush_kmsg_start(void);
130 extern void panic_flush_kmsg_end(void);
131 #endif /* !__ASSEMBLY__ */
132
133 #endif /* __KERNEL__ */
134 #endif /* _ASM_POWERPC_BUG_H */
135
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