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torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/arch/sh/include/asm/bug.h
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/* SPDX-License-Identifier: GPL-2.0 */

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#ifndef __ASM_SH_BUG_H

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#define __ASM_SH_BUG_H

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#include <linux/linkage.h>

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#define TRAPA_BUG_OPCODE	0xc33e	/* trapa #0x3e */

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#define BUGFLAG_UNWINDER	(1 << 1)

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#ifdef CONFIG_GENERIC_BUG

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#define HAVE_ARCH_BUG

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#define HAVE_ARCH_WARN_ON

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/**

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 * _EMIT_BUG_ENTRY

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 * %1 - __FILE__

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 * %2 - __LINE__

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 * %3 - trap type

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 * %4 - sizeof(struct bug_entry)

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 *

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 * The trapa opcode itself sits in %0.

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 * The %O notation is used to avoid # generation.

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 *

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 * The offending file and line are encoded in the __bug_table section.

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 */

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#ifdef CONFIG_DEBUG_BUGVERBOSE

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#define _EMIT_BUG_ENTRY				\

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	"\t.pushsection __bug_table,\"aw\"\n"	\

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	"2:\t.long 1b, %O1\n"			\

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	"\t.short %O2, %O3\n"			\

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	"\t.org 2b+%O4\n"			\

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	"\t.popsection\n"

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#else

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#define _EMIT_BUG_ENTRY				\

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	"\t.pushsection __bug_table,\"aw\"\n"	\

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	"2:\t.long 1b\n"			\

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	"\t.short %O3\n"			\

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	"\t.org 2b+%O4\n"			\

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	"\t.popsection\n"

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#endif

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#define BUG()						\

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do {							\

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	__asm__ __volatile__ (				\

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		"1:\t.short %O0\n"			\

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		_EMIT_BUG_ENTRY				\

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		 :					\

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		 : "n" (TRAPA_BUG_OPCODE),		\

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		   "i" (__FILE__),			\

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		   "i" (__LINE__), "i" (0),		\

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		   "i" (sizeof(struct bug_entry)));	\

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	unreachable();					\

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} while (0)

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#define __WARN_FLAGS(flags)				\

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do {							\

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	__asm__ __volatile__ (				\

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		"1:\t.short %O0\n"			\

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		 _EMIT_BUG_ENTRY			\

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		 :					\

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		 : "n" (TRAPA_BUG_OPCODE),		\

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		   "i" (__FILE__),			\

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		   "i" (__LINE__),			\

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		   "i" (BUGFLAG_WARNING|(flags)),	\

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		   "i" (sizeof(struct bug_entry)));	\

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} while (0)

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#define WARN_ON(x) ({						\

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	int __ret_warn_on = !!(x);				\

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	if (__builtin_constant_p(__ret_warn_on)) {		\

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		if (__ret_warn_on)				\

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			__WARN();				\

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	} else {						\

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		if (unlikely(__ret_warn_on))			\

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			__WARN();				\

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	}							\

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	unlikely(__ret_warn_on);				\

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})

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#define UNWINDER_BUG()					\

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do {							\

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	__asm__ __volatile__ (				\

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		"1:\t.short %O0\n"			\

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		_EMIT_BUG_ENTRY				\

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		 :					\

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		 : "n" (TRAPA_BUG_OPCODE),		\

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		   "i" (__FILE__),			\

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		   "i" (__LINE__),			\

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		   "i" (BUGFLAG_UNWINDER),		\

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		   "i" (sizeof(struct bug_entry)));	\

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} while (0)

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#define UNWINDER_BUG_ON(x) ({					\

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	int __ret_unwinder_on = !!(x);				\

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	if (__builtin_constant_p(__ret_unwinder_on)) {		\

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		if (__ret_unwinder_on)				\

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			UNWINDER_BUG();				\

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	} else {						\

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		if (unlikely(__ret_unwinder_on))		\

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			UNWINDER_BUG();				\

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	}							\

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	unlikely(__ret_unwinder_on);				\

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})

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#else

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#define UNWINDER_BUG	BUG

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#define UNWINDER_BUG_ON	BUG_ON

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#endif /* CONFIG_GENERIC_BUG */

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#include <asm-generic/bug.h>

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struct pt_regs;

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/* arch/sh/kernel/traps.c */

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extern void die(const char *str, struct pt_regs *regs, long err) __attribute__ ((noreturn));

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extern void die_if_kernel(const char *str, struct pt_regs *regs, long err);

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extern void die_if_no_fixup(const char *str, struct pt_regs *regs, long err);

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#endif /* __ASM_SH_BUG_H */

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