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:	 .4byte \addr - .
 16	 .4byte 5002f - .
 17	 .short \line, \flags
 18	 .org 5001b+BUG_ENTRY_SIZE
 19	 .previous
 20	 .section .rodata,"a"
 215002:	 .asciz "\file"
 22	 .previous
 23.endm
 24#else
 25.macro EMIT_BUG_ENTRY addr,file,line,flags
 26	 .section __bug_table,"aw"
 275001:	 .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
120struct pt_regs;
121void hash__do_page_fault(struct pt_regs *);
122void bad_page_fault(struct pt_regs *, int);
123void emulate_single_step(struct pt_regs *regs);
124extern void _exception(int, struct pt_regs *, int, unsigned long);
125extern void _exception_pkey(struct pt_regs *, unsigned long, int);
126extern void die(const char *, struct pt_regs *, long);
127void die_mce(const char *str, struct pt_regs *regs, long err);
128extern bool die_will_crash(void);
129extern void panic_flush_kmsg_start(void);
130extern void panic_flush_kmsg_end(void);
131#endif /* !__ASSEMBLY__ */
132
133#endif /* __KERNEL__ */
134#endif /* _ASM_POWERPC_BUG_H */