[linux-2.6-block.git] / arch / powerpc / include / asm / bug.h

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _ASM_POWERPC_BUG_H
#define _ASM_POWERPC_BUG_H
#ifdef __KERNEL__

#include <asm/asm-compat.h>

/*
 * Define an illegal instr to trap on the bug.
 * We don't use 0 because that marks the end of a function
 * in the ELF ABI.  That's "Boo Boo" in case you wonder...
 */
#define BUG_OPCODE .long 0x00b00b00  /* For asm */
#define BUG_ILLEGAL_INSTR "0x00b00b00" /* For BUG macro */

#ifdef CONFIG_BUG

#ifdef __ASSEMBLY__
#include <asm/asm-offsets.h>
#ifdef CONFIG_DEBUG_BUGVERBOSE
.macro EMIT_BUG_ENTRY addr,file,line,flags
	 .section __bug_table,"aw"
5001:	 PPC_LONG \addr, 5002f
	 .short \line, \flags
	 .org 5001b+BUG_ENTRY_SIZE
	 .previous
	 .section .rodata,"a"
5002:	 .asciz "\file"
	 .previous
.endm
#else
.macro EMIT_BUG_ENTRY addr,file,line,flags
	 .section __bug_table,"aw"
5001:	 PPC_LONG \addr
	 .short \flags
	 .org 5001b+BUG_ENTRY_SIZE
	 .previous
.endm
#endif /* verbose */

#else /* !__ASSEMBLY__ */
/* _EMIT_BUG_ENTRY expects args %0,%1,%2,%3 to be FILE, LINE, flags and
   sizeof(struct bug_entry), respectively */
#ifdef CONFIG_DEBUG_BUGVERBOSE
#define _EMIT_BUG_ENTRY				\
	".section __bug_table,\"aw\"\n"		\
	"2:\t" PPC_LONG "1b, %0\n"		\
	"\t.short %1, %2\n"			\
	".org 2b+%3\n"				\
	".previous\n"
#else
#define _EMIT_BUG_ENTRY				\
	".section __bug_table,\"aw\"\n"		\
	"2:\t" PPC_LONG "1b\n"			\
	"\t.short %2\n"				\
	".org 2b+%3\n"				\
	".previous\n"
#endif

/*
 * BUG_ON() and WARN_ON() do their best to cooperate with compile-time
 * optimisations. However depending on the complexity of the condition
 * some compiler versions may not produce optimal results.
 */

#define BUG() do {						\
	__asm__ __volatile__(					\
		"1:	twi 31,0,0\n"				\
		_EMIT_BUG_ENTRY					\
		: : "i" (__FILE__), "i" (__LINE__),		\
		    "i" (0), "i"  (sizeof(struct bug_entry)));	\
	unreachable();						\
} while (0)

#define BUG_ON(x) do {						\
	if (__builtin_constant_p(x)) {				\
		if (x)						\
			BUG();					\
	} else {						\
		__asm__ __volatile__(				\
		"1:	"PPC_TLNEI"	%4,0\n"			\
		_EMIT_BUG_ENTRY					\
		: : "i" (__FILE__), "i" (__LINE__), "i" (0),	\
		  "i" (sizeof(struct bug_entry)),		\
		  "r" ((__force long)(x)));			\
	}							\
} while (0)

#define __WARN_FLAGS(flags) do {				\
	__asm__ __volatile__(					\
		"1:	twi 31,0,0\n"				\
		_EMIT_BUG_ENTRY					\
		: : "i" (__FILE__), "i" (__LINE__),		\
		  "i" (BUGFLAG_WARNING|(flags)),		\
		  "i" (sizeof(struct bug_entry)));		\
} while (0)

#define WARN_ON(x) ({						\
	int __ret_warn_on = !!(x);				\
	if (__builtin_constant_p(__ret_warn_on)) {		\
		if (__ret_warn_on)				\
			__WARN();				\
	} else {						\
		__asm__ __volatile__(				\
		"1:	"PPC_TLNEI"	%4,0\n"			\
		_EMIT_BUG_ENTRY					\
		: : "i" (__FILE__), "i" (__LINE__),		\
		  "i" (BUGFLAG_WARNING|BUGFLAG_TAINT(TAINT_WARN)),\
		  "i" (sizeof(struct bug_entry)),		\
		  "r" (__ret_warn_on));				\
	}							\
	unlikely(__ret_warn_on);				\
})

#define HAVE_ARCH_BUG
#define HAVE_ARCH_BUG_ON
#define HAVE_ARCH_WARN_ON
#endif /* __ASSEMBLY __ */
#else
#ifdef __ASSEMBLY__
.macro EMIT_BUG_ENTRY addr,file,line,flags
.endm
#else /* !__ASSEMBLY__ */
#define _EMIT_BUG_ENTRY
#endif
#endif /* CONFIG_BUG */

#include <asm-generic/bug.h>

#ifndef __ASSEMBLY__

struct pt_regs;
extern int do_page_fault(struct pt_regs *, unsigned long, unsigned long);
extern void bad_page_fault(struct pt_regs *, unsigned long, int);
extern void _exception(int, struct pt_regs *, int, unsigned long);
extern void die(const char *, struct pt_regs *, long);
extern bool die_will_crash(void);

#endif /* !__ASSEMBLY__ */

#endif /* __KERNEL__ */
#endif /* _ASM_POWERPC_BUG_H */
Commit	Line	Data
b2441318	1	/* SPDX-License-Identifier: GPL-2.0 */
25433b12 BB	2	#ifndef _ASM_POWERPC_BUG_H
25433b12 BB	3	#define _ASM_POWERPC_BUG_H
88ced031	4	#ifdef __KERNEL__
1da177e4	5
3ddfbcf1	6	#include <asm/asm-compat.h>
a58f053b	7
1da177e4 LT	8	/*
	9	* Define an illegal instr to trap on the bug.
	10	* We don't use 0 because that marks the end of a function
	11	* in the ELF ABI. That's "Boo Boo" in case you wonder...
	12	*/
	13	#define BUG_OPCODE .long 0x00b00b00 /* For asm */
	14	#define BUG_ILLEGAL_INSTR "0x00b00b00" /* For BUG macro */
	15
c8538a7a MM	16	#ifdef CONFIG_BUG
c8538a7a MM	17
007d88d0	18	#ifdef __ASSEMBLY__
a58f053b	19	#include <asm/asm-offsets.h>
007d88d0 DW	20	#ifdef CONFIG_DEBUG_BUGVERBOSE
007d88d0 DW	21	.macro EMIT_BUG_ENTRY addr,file,line,flags
325cdacd	22	.section __bug_table,"aw"
007d88d0 DW	23	5001: PPC_LONG \addr, 5002f
	24	.short \line, \flags
	25	.org 5001b+BUG_ENTRY_SIZE
	26	.previous
	27	.section .rodata,"a"
	28	5002: .asciz "\file"
	29	.previous
	30	.endm
	31	#else
a58f053b	32	.macro EMIT_BUG_ENTRY addr,file,line,flags
325cdacd	33	.section __bug_table,"aw"
007d88d0 DW	34	5001: PPC_LONG \addr
	35	.short \flags
	36	.org 5001b+BUG_ENTRY_SIZE
	37	.previous
	38	.endm
	39	#endif /* verbose */
	40
	41	#else /* !__ASSEMBLY__ */
73c9ceab JF	42	/* _EMIT_BUG_ENTRY expects args %0,%1,%2,%3 to be FILE, LINE, flags and
	43	sizeof(struct bug_entry), respectively */
	44	#ifdef CONFIG_DEBUG_BUGVERBOSE
	45	#define _EMIT_BUG_ENTRY \
325cdacd	46	".section __bug_table,\"aw\"\n" \
73c9ceab JF	47	"2:\t" PPC_LONG "1b, %0\n" \
	48	"\t.short %1, %2\n" \
	49	".org 2b+%3\n" \
	50	".previous\n"
	51	#else
	52	#define _EMIT_BUG_ENTRY \
325cdacd	53	".section __bug_table,\"aw\"\n" \
73c9ceab JF	54	"2:\t" PPC_LONG "1b\n" \
	55	"\t.short %2\n" \
	56	".org 2b+%3\n" \
	57	".previous\n"
	58	#endif
	59
e3f94b85 ME	60	/*
	61	* BUG_ON() and WARN_ON() do their best to cooperate with compile-time
	62	* optimisations. However depending on the complexity of the condition
	63	* some compiler versions may not produce optimal results.
	64	*/
	65
73c9ceab JF	66	#define BUG() do { \
	67	__asm__ __volatile__( \
	68	"1: twi 31,0,0\n" \
	69	_EMIT_BUG_ENTRY \
	70	: : "i" (__FILE__), "i" (__LINE__), \
	71	"i" (0), "i" (sizeof(struct bug_entry))); \
01ae45bc	72	unreachable(); \
1da177e4 LT	73	} while (0)
	74
	75	#define BUG_ON(x) do { \
e3f94b85 ME	76	if (__builtin_constant_p(x)) { \
	77	if (x) \
	78	BUG(); \
	79	} else { \
	80	__asm__ __volatile__( \
73c9ceab JF	81	"1: "PPC_TLNEI" %4,0\n" \
	82	_EMIT_BUG_ENTRY \
	83	: : "i" (__FILE__), "i" (__LINE__), "i" (0), \
	84	"i" (sizeof(struct bug_entry)), \
97f1e7f7	85	"r" ((__force long)(x))); \
e3f94b85	86	} \
1da177e4 LT	87	} while (0)
1da177e4 LT	88
19d43626	89	#define __WARN_FLAGS(flags) do { \
1da177e4	90	__asm__ __volatile__( \
e3f94b85	91	"1: twi 31,0,0\n" \
73c9ceab JF	92	_EMIT_BUG_ENTRY \
73c9ceab JF	93	: : "i" (__FILE__), "i" (__LINE__), \
19d43626	94	"i" (BUGFLAG_WARNING\|(flags)), \
73c9ceab	95	"i" (sizeof(struct bug_entry))); \
e3f94b85 ME	96	} while (0)
e3f94b85 ME	97
684f9783	98	#define WARN_ON(x) ({ \
8d4fbcfb	99	int __ret_warn_on = !!(x); \
684f9783 HX	100	if (__builtin_constant_p(__ret_warn_on)) { \
684f9783 HX	101	if (__ret_warn_on) \
872345b7	102	__WARN(); \
e3f94b85 ME	103	} else { \
e3f94b85 ME	104	__asm__ __volatile__( \
73c9ceab JF	105	"1: "PPC_TLNEI" %4,0\n" \
	106	_EMIT_BUG_ENTRY \
	107	: : "i" (__FILE__), "i" (__LINE__), \
a093c92d	108	"i" (BUGFLAG_WARNING\|BUGFLAG_TAINT(TAINT_WARN)),\
73c9ceab JF	109	"i" (sizeof(struct bug_entry)), \
73c9ceab JF	110	"r" (__ret_warn_on)); \
e3f94b85	111	} \
684f9783 HX	112	unlikely(__ret_warn_on); \
684f9783 HX	113	})
1da177e4	114
1da177e4 LT	115	#define HAVE_ARCH_BUG
	116	#define HAVE_ARCH_BUG_ON
	117	#define HAVE_ARCH_WARN_ON
25433b12	118	#endif /* __ASSEMBLY __ */
a58f053b BH	119	#else
	120	#ifdef __ASSEMBLY__
	121	.macro EMIT_BUG_ENTRY addr,file,line,flags
	122	.endm
	123	#else /* !__ASSEMBLY__ */
	124	#define _EMIT_BUG_ENTRY
	125	#endif
007d88d0	126	#endif /* CONFIG_BUG */
c8538a7a	127
1da177e4 LT	128	#include <asm-generic/bug.h>
1da177e4 LT	129
ae3a197e DH	130	#ifndef __ASSEMBLY__
	131
	132	struct pt_regs;
	133	extern int do_page_fault(struct pt_regs *, unsigned long, unsigned long);
	134	extern void bad_page_fault(struct pt_regs *, unsigned long, int);
	135	extern void _exception(int, struct pt_regs *, int, unsigned long);
	136	extern void die(const char , struct pt_regs , long);
6fcd6baa	137	extern bool die_will_crash(void);
ae3a197e DH	138
	139	#endif /* !__ASSEMBLY__ */
	140
88ced031	141	#endif /* __KERNEL__ */
25433b12	142	#endif /* _ASM_POWERPC_BUG_H */