Linux kernel mirror (for testing)
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linux
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#include <asm/extable.h>
8
9#ifdef CONFIG_BUG
10
11#ifdef __ASSEMBLY__
12#include <asm/asm-offsets.h>
13#ifdef CONFIG_DEBUG_BUGVERBOSE
14.macro __EMIT_BUG_ENTRY addr,file,line,flags
15 .section __bug_table,"aw"
165001: .4byte \addr - .
17 .4byte 5002f - .
18 .short \line, \flags
19 .org 5001b+BUG_ENTRY_SIZE
20 .previous
21 .section .rodata,"a"
225002: .asciz "\file"
23 .previous
24.endm
25#else
26.macro __EMIT_BUG_ENTRY addr,file,line,flags
27 .section __bug_table,"aw"
285001: .4byte \addr - .
29 .short \flags
30 .org 5001b+BUG_ENTRY_SIZE
31 .previous
32.endm
33#endif /* verbose */
34
35.macro EMIT_WARN_ENTRY addr,file,line,flags
36 EX_TABLE(\addr,\addr+4)
37 __EMIT_BUG_ENTRY \addr,\file,\line,\flags
38.endm
39
40.macro EMIT_BUG_ENTRY addr,file,line,flags
41 .if \flags & 1 /* BUGFLAG_WARNING */
42 .err /* Use EMIT_WARN_ENTRY for warnings */
43 .endif
44 __EMIT_BUG_ENTRY \addr,\file,\line,\flags
45.endm
46
47#else /* !__ASSEMBLY__ */
48/* _EMIT_BUG_ENTRY expects args %0,%1,%2,%3 to be FILE, LINE, flags and
49 sizeof(struct bug_entry), respectively */
50#ifdef CONFIG_DEBUG_BUGVERBOSE
51#define _EMIT_BUG_ENTRY \
52 ".section __bug_table,\"aw\"\n" \
53 "2: .4byte 1b - .\n" \
54 " .4byte %0 - .\n" \
55 " .short %1, %2\n" \
56 ".org 2b+%3\n" \
57 ".previous\n"
58#else
59#define _EMIT_BUG_ENTRY \
60 ".section __bug_table,\"aw\"\n" \
61 "2: .4byte 1b - .\n" \
62 " .short %2\n" \
63 ".org 2b+%3\n" \
64 ".previous\n"
65#endif
66
67#define BUG_ENTRY(insn, flags, ...) \
68 __asm__ __volatile__( \
69 "1: " insn "\n" \
70 _EMIT_BUG_ENTRY \
71 : : "i" (__FILE__), "i" (__LINE__), \
72 "i" (flags), \
73 "i" (sizeof(struct bug_entry)), \
74 ##__VA_ARGS__)
75
76#define WARN_ENTRY(insn, flags, label, ...) \
77 asm_volatile_goto( \
78 "1: " insn "\n" \
79 EX_TABLE(1b, %l[label]) \
80 _EMIT_BUG_ENTRY \
81 : : "i" (__FILE__), "i" (__LINE__), \
82 "i" (flags), \
83 "i" (sizeof(struct bug_entry)), \
84 ##__VA_ARGS__ : : label)
85
86/*
87 * BUG_ON() and WARN_ON() do their best to cooperate with compile-time
88 * optimisations. However depending on the complexity of the condition
89 * some compiler versions may not produce optimal results.
90 */
91
92#define BUG() do { \
93 BUG_ENTRY("twi 31, 0, 0", 0); \
94 unreachable(); \
95} while (0)
96#define HAVE_ARCH_BUG
97
98#define __WARN_FLAGS(flags) do { \
99 __label__ __label_warn_on; \
100 \
101 WARN_ENTRY("twi 31, 0, 0", BUGFLAG_WARNING | (flags), __label_warn_on); \
102 barrier_before_unreachable(); \
103 __builtin_unreachable(); \
104 \
105__label_warn_on: \
106 break; \
107} while (0)
108
109#ifdef CONFIG_PPC64
110#define BUG_ON(x) do { \
111 if (__builtin_constant_p(x)) { \
112 if (x) \
113 BUG(); \
114 } else { \
115 BUG_ENTRY(PPC_TLNEI " %4, 0", 0, "r" ((__force long)(x))); \
116 } \
117} while (0)
118
119#define WARN_ON(x) ({ \
120 bool __ret_warn_on = false; \
121 do { \
122 if (__builtin_constant_p((x))) { \
123 if (!(x)) \
124 break; \
125 __WARN(); \
126 __ret_warn_on = true; \
127 } else { \
128 __label__ __label_warn_on; \
129 \
130 WARN_ENTRY(PPC_TLNEI " %4, 0", \
131 BUGFLAG_WARNING | BUGFLAG_TAINT(TAINT_WARN), \
132 __label_warn_on, \
133 "r" ((__force long)(x))); \
134 break; \
135__label_warn_on: \
136 __ret_warn_on = true; \
137 } \
138 } while (0); \
139 unlikely(__ret_warn_on); \
140})
141
142#define HAVE_ARCH_BUG_ON
143#define HAVE_ARCH_WARN_ON
144#endif
145
146#endif /* __ASSEMBLY __ */
147#else
148#ifdef __ASSEMBLY__
149.macro EMIT_BUG_ENTRY addr,file,line,flags
150.endm
151.macro EMIT_WARN_ENTRY addr,file,line,flags
152.endm
153#else /* !__ASSEMBLY__ */
154#define _EMIT_BUG_ENTRY
155#define _EMIT_WARN_ENTRY
156#endif
157#endif /* CONFIG_BUG */
158
159#include <asm-generic/bug.h>
160
161#ifndef __ASSEMBLY__
162
163struct pt_regs;
164void hash__do_page_fault(struct pt_regs *);
165void bad_page_fault(struct pt_regs *, int);
166extern void _exception(int, struct pt_regs *, int, unsigned long);
167extern void _exception_pkey(struct pt_regs *, unsigned long, int);
168extern void die(const char *, struct pt_regs *, long);
169void die_mce(const char *str, struct pt_regs *regs, long err);
170extern bool die_will_crash(void);
171extern void panic_flush_kmsg_start(void);
172extern void panic_flush_kmsg_end(void);
173#endif /* !__ASSEMBLY__ */
174
175#endif /* __KERNEL__ */
176#endif /* _ASM_POWERPC_BUG_H */