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"
155001:	 PPC_LONG \addr, 5002f
16	 .short \line, \flags
17	 .org 5001b+BUG_ENTRY_SIZE
18	 .previous
19	 .section .rodata,"a"
205002:	 .asciz "\file"
21	 .previous
22.endm
23#else
24.macro EMIT_BUG_ENTRY addr,file,line,flags
25	 .section __bug_table,"aw"
265001:	 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#define BUG_ENTRY(insn, flags, ...)			\
53	__asm__ __volatile__(				\
54		"1:	" insn "\n"			\
55		_EMIT_BUG_ENTRY				\
56		: : "i" (__FILE__), "i" (__LINE__),	\
57		  "i" (flags),				\
58		  "i" (sizeof(struct bug_entry)),	\
59		  ##__VA_ARGS__)
60
61/*
62 * BUG_ON() and WARN_ON() do their best to cooperate with compile-time
63 * optimisations. However depending on the complexity of the condition
64 * some compiler versions may not produce optimal results.
65 */
66
67#define BUG() do {						\
68	BUG_ENTRY("twi 31, 0, 0", 0);				\
69	unreachable();						\
70} while (0)
71
72#define BUG_ON(x) do {						\
73	if (__builtin_constant_p(x)) {				\
74		if (x)						\
75			BUG();					\
76	} else {						\
77		BUG_ENTRY(PPC_TLNEI " %4, 0", 0, "r" ((__force long)(x)));	\
78	}							\
79} while (0)
80
81#define __WARN_FLAGS(flags) BUG_ENTRY("twi 31, 0, 0", BUGFLAG_WARNING | (flags))
82
83#define WARN_ON(x) ({						\
84	int __ret_warn_on = !!(x);				\
85	if (__builtin_constant_p(__ret_warn_on)) {		\
86		if (__ret_warn_on)				\
87			__WARN();				\
88	} else {						\
89		BUG_ENTRY(PPC_TLNEI " %4, 0",			\
90			  BUGFLAG_WARNING | BUGFLAG_TAINT(TAINT_WARN),	\
91			  "r" (__ret_warn_on));	\
92	}							\
93	unlikely(__ret_warn_on);				\
94})
95
96#define HAVE_ARCH_BUG
97#define HAVE_ARCH_BUG_ON
98#define HAVE_ARCH_WARN_ON
99#endif /* __ASSEMBLY __ */
100#else
101#ifdef __ASSEMBLY__
102.macro EMIT_BUG_ENTRY addr,file,line,flags
103.endm
104#else /* !__ASSEMBLY__ */
105#define _EMIT_BUG_ENTRY
106#endif
107#endif /* CONFIG_BUG */
108
109#include <asm-generic/bug.h>
110
111#ifndef __ASSEMBLY__
112
113struct pt_regs;
114extern int do_page_fault(struct pt_regs *, unsigned long, unsigned long);
115extern void bad_page_fault(struct pt_regs *, unsigned long, int);
116extern void _exception(int, struct pt_regs *, int, unsigned long);
117extern void _exception_pkey(struct pt_regs *, unsigned long, int);
118extern void die(const char *, struct pt_regs *, long);
119extern bool die_will_crash(void);
120extern void panic_flush_kmsg_start(void);
121extern void panic_flush_kmsg_end(void);
122#endif /* !__ASSEMBLY__ */
123
124#endif /* __KERNEL__ */
125#endif /* _ASM_POWERPC_BUG_H */
126