[mirror_ubuntu-jammy-kernel.git] / arch / powerpc / include / asm / extable.h

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _ARCH_POWERPC_EXTABLE_H
#define _ARCH_POWERPC_EXTABLE_H

/*
 * The exception table consists of pairs of relative addresses: the first is
 * the address of an instruction that is allowed to fault, and the second is
 * the address at which the program should continue.  No registers are
 * modified, so it is entirely up to the continuation code to figure out what
 * to do.
 *
 * All the routines below use bits of fixup code that are out of line with the
 * main instruction path.  This means when everything is well, we don't even
 * have to jump over them.  Further, they do not intrude on our cache or tlb
 * entries.
 */

#define ARCH_HAS_RELATIVE_EXTABLE

#ifndef __ASSEMBLY__

struct exception_table_entry {
	int insn;
	int fixup;
};

static inline unsigned long extable_fixup(const struct exception_table_entry *x)
{
	return (unsigned long)&x->fixup + x->fixup;
}

#endif

/*
 * Helper macro for exception table entries
 */
#define EX_TABLE(_fault, _target)		\
	stringify_in_c(.section __ex_table,"a";)\
	stringify_in_c(.balign 4;)		\
	stringify_in_c(.long (_fault) - . ;)	\
	stringify_in_c(.long (_target) - . ;)	\
	stringify_in_c(.previous)

#endif
Commit	Line	Data
b2441318	1	/* SPDX-License-Identifier: GPL-2.0 */
527b5bae AV	2	#ifndef _ARCH_POWERPC_EXTABLE_H
	3	#define _ARCH_POWERPC_EXTABLE_H
	4
	5	/*
	6	* The exception table consists of pairs of relative addresses: the first is
	7	* the address of an instruction that is allowed to fault, and the second is
	8	* the address at which the program should continue. No registers are
	9	* modified, so it is entirely up to the continuation code to figure out what
	10	* to do.
	11	*
	12	* All the routines below use bits of fixup code that are out of line with the
	13	* main instruction path. This means when everything is well, we don't even
	14	* have to jump over them. Further, they do not intrude on our cache or tlb
	15	* entries.
	16	*/
	17
	18	#define ARCH_HAS_RELATIVE_EXTABLE
	19
1e688dd2 CL	20	#ifndef __ASSEMBLY__
1e688dd2 CL	21
527b5bae AV	22	struct exception_table_entry {
	23	int insn;
	24	int fixup;
	25	};
	26
	27	static inline unsigned long extable_fixup(const struct exception_table_entry *x)
	28	{
	29	return (unsigned long)&x->fixup + x->fixup;
	30	}
	31
	32	#endif
1e688dd2 CL	33
	34	/*
	35	* Helper macro for exception table entries
	36	*/
	37	#define EX_TABLE(_fault, _target) \
	38	stringify_in_c(.section __ex_table,"a";)\
	39	stringify_in_c(.balign 4;) \
	40	stringify_in_c(.long (_fault) - . ;) \
	41	stringify_in_c(.long (_target) - . ;) \
	42	stringify_in_c(.previous)
	43
	44	#endif