1#ifndef _ASM_POWERPC_BUG_H
2#define _ASM_POWERPC_BUG_H
3#ifdef __KERNEL__
4
5#include <asm/asm-compat.h>
6
7/*
8 * Define an illegal instr to trap on the bug.
9 * We don't use 0 because that marks the end of a function
10 * in the ELF ABI.  That's "Boo Boo" in case you wonder...
11 */
12#define BUG_OPCODE .long 0x00b00b00  /* For asm */
13#define BUG_ILLEGAL_INSTR "0x00b00b00" /* For BUG macro */
14
15#ifdef CONFIG_BUG
16
17#ifdef __ASSEMBLY__
18#include <asm/asm-offsets.h>
19#ifdef CONFIG_DEBUG_BUGVERBOSE
20.macro EMIT_BUG_ENTRY addr,file,line,flags
21	 .section __bug_table,"a"
225001:	 PPC_LONG \addr, 5002f
23	 .short \line, \flags
24	 .org 5001b+BUG_ENTRY_SIZE
25	 .previous
26	 .section .rodata,"a"
275002:	 .asciz "\file"
28	 .previous
29.endm
30#else
31.macro EMIT_BUG_ENTRY addr,file,line,flags
32	 .section __bug_table,"a"
335001:	 PPC_LONG \addr
34	 .short \flags
35	 .org 5001b+BUG_ENTRY_SIZE
36	 .previous
37.endm
38#endif /* verbose */
39
40#else /* !__ASSEMBLY__ */
41/* _EMIT_BUG_ENTRY expects args %0,%1,%2,%3 to be FILE, LINE, flags and
42   sizeof(struct bug_entry), respectively */
43#ifdef CONFIG_DEBUG_BUGVERBOSE
44#define _EMIT_BUG_ENTRY				\
45	".section __bug_table,\"a\"\n"		\
46	"2:\t" PPC_LONG "1b, %0\n"		\
47	"\t.short %1, %2\n"			\
48	".org 2b+%3\n"				\
49	".previous\n"
50#else
51#define _EMIT_BUG_ENTRY				\
52	".section __bug_table,\"a\"\n"		\
53	"2:\t" PPC_LONG "1b\n"			\
54	"\t.short %2\n"				\
55	".org 2b+%3\n"				\
56	".previous\n"
57#endif
58
59/*
60 * BUG_ON() and WARN_ON() do their best to cooperate with compile-time
61 * optimisations. However depending on the complexity of the condition
62 * some compiler versions may not produce optimal results.
63 */
64
65#define BUG() do {						\
66	__asm__ __volatile__(					\
67		"1:	twi 31,0,0\n"				\
68		_EMIT_BUG_ENTRY					\
69		: : "i" (__FILE__), "i" (__LINE__),		\
70		    "i" (0), "i"  (sizeof(struct bug_entry)));	\
71	unreachable();						\
72} while (0)
73
74#define BUG_ON(x) do {						\
75	if (__builtin_constant_p(x)) {				\
76		if (x)						\
77			BUG();					\
78	} else {						\
79		__asm__ __volatile__(				\
80		"1:	"PPC_TLNEI"	%4,0\n"			\
81		_EMIT_BUG_ENTRY					\
82		: : "i" (__FILE__), "i" (__LINE__), "i" (0),	\
83		  "i" (sizeof(struct bug_entry)),		\
84		  "r" ((__force long)(x)));			\
85	}							\
86} while (0)
87
88#define __WARN_TAINT(taint) do {				\
89	__asm__ __volatile__(					\
90		"1:	twi 31,0,0\n"				\
91		_EMIT_BUG_ENTRY					\
92		: : "i" (__FILE__), "i" (__LINE__),		\
93		  "i" (BUGFLAG_TAINT(taint)),			\
94		  "i" (sizeof(struct bug_entry)));		\
95} while (0)
96
97#define WARN_ON(x) ({						\
98	int __ret_warn_on = !!(x);				\
99	if (__builtin_constant_p(__ret_warn_on)) {		\
100		if (__ret_warn_on)				\
101			__WARN();				\
102	} else {						\
103		__asm__ __volatile__(				\
104		"1:	"PPC_TLNEI"	%4,0\n"			\
105		_EMIT_BUG_ENTRY					\
106		: : "i" (__FILE__), "i" (__LINE__),		\
107		  "i" (BUGFLAG_TAINT(TAINT_WARN)),		\
108		  "i" (sizeof(struct bug_entry)),		\
109		  "r" (__ret_warn_on));				\
110	}							\
111	unlikely(__ret_warn_on);				\
112})
113
114#define HAVE_ARCH_BUG
115#define HAVE_ARCH_BUG_ON
116#define HAVE_ARCH_WARN_ON
117#endif /* __ASSEMBLY __ */
118#else
119#ifdef __ASSEMBLY__
120.macro EMIT_BUG_ENTRY addr,file,line,flags
121.endm
122#else /* !__ASSEMBLY__ */
123#define _EMIT_BUG_ENTRY
124#endif
125#endif /* CONFIG_BUG */
126
127#include <asm-generic/bug.h>
128
129#ifndef __ASSEMBLY__
130
131struct pt_regs;
132extern int do_page_fault(struct pt_regs *, unsigned long, unsigned long);
133extern void bad_page_fault(struct pt_regs *, unsigned long, int);
134extern void _exception(int, struct pt_regs *, int, unsigned long);
135extern void die(const char *, struct pt_regs *, long);
136
137#endif /* !__ASSEMBLY__ */
138
139#endif /* __KERNEL__ */
140#endif /* _ASM_POWERPC_BUG_H */
141