[linux-2.6-block.git] / arch / riscv / include / asm / jump_label.h

/* SPDX-License-Identifier: GPL-2.0-only */
/*
 * Copyright (C) 2020 Emil Renner Berthing
 *
 * Based on arch/arm64/include/asm/jump_label.h
 */
#ifndef __ASM_JUMP_LABEL_H
#define __ASM_JUMP_LABEL_H

#ifndef __ASSEMBLY__

#include <linux/types.h>
#include <asm/asm.h>

#define HAVE_JUMP_LABEL_BATCH

#define JUMP_LABEL_NOP_SIZE 4

#define JUMP_TABLE_ENTRY(key, label)			\
	".pushsection	__jump_table, \"aw\"	\n\t"	\
	".align		" RISCV_LGPTR "		\n\t"	\
	".long		1b - ., " label " - .	\n\t"	\
	"" RISCV_PTR "	" key " - .		\n\t"	\
	".popsection				\n\t"

/* This macro is also expanded on the Rust side. */
#define ARCH_STATIC_BRANCH_ASM(key, label)		\
	"	.align		2		\n\t"	\
	"	.option push			\n\t"	\
	"	.option norelax			\n\t"	\
	"	.option norvc			\n\t"	\
	"1:	nop				\n\t"	\
	"	.option pop			\n\t"	\
	JUMP_TABLE_ENTRY(key, label)

static __always_inline bool arch_static_branch(struct static_key * const key,
					       const bool branch)
{
	asm goto(
		ARCH_STATIC_BRANCH_ASM("%0", "%l[label]")
		:  :  "i"(&((char *)key)[branch]) :  : label);

	return false;
label:
	return true;
}

#define ARCH_STATIC_BRANCH_JUMP_ASM(key, label)		\
	"	.align		2		\n\t"	\
	"	.option push			\n\t"	\
	"	.option norelax			\n\t"	\
	"	.option norvc			\n\t"	\
	"1:	j	" label "		\n\t" \
	"	.option pop			\n\t"	\
	JUMP_TABLE_ENTRY(key, label)

static __always_inline bool arch_static_branch_jump(struct static_key * const key,
						    const bool branch)
{
	asm goto(
		ARCH_STATIC_BRANCH_JUMP_ASM("%0", "%l[label]")
		:  :  "i"(&((char *)key)[branch]) :  : label);

	return false;
label:
	return true;
}

#endif  /* __ASSEMBLY__ */
#endif	/* __ASM_JUMP_LABEL_H */
Commit	Line	Data
ebc00dde ERB	1	/* SPDX-License-Identifier: GPL-2.0-only */
	2	/*
	3	* Copyright (C) 2020 Emil Renner Berthing
	4	*
	5	* Based on arch/arm64/include/asm/jump_label.h
	6	*/
	7	#ifndef __ASM_JUMP_LABEL_H
	8	#define __ASM_JUMP_LABEL_H
	9
	10	#ifndef __ASSEMBLY__
	11
	12	#include <linux/types.h>
	13	#include <asm/asm.h>
	14
652b56b1 SH	15	#define HAVE_JUMP_LABEL_BATCH
652b56b1 SH	16
ebc00dde ERB	17	#define JUMP_LABEL_NOP_SIZE 4
ebc00dde ERB	18
aecaf181 AR	19	#define JUMP_TABLE_ENTRY(key, label) \
	20	".pushsection __jump_table, \"aw\" \n\t" \
	21	".align " RISCV_LGPTR " \n\t" \
	22	".long 1b - ., " label " - . \n\t" \
	23	"" RISCV_PTR " " key " - . \n\t" \
	24	".popsection \n\t"
	25
	26	/* This macro is also expanded on the Rust side. */
	27	#define ARCH_STATIC_BRANCH_ASM(key, label) \
	28	" .align 2 \n\t" \
	29	" .option push \n\t" \
	30	" .option norelax \n\t" \
	31	" .option norvc \n\t" \
	32	"1: nop \n\t" \
	33	" .option pop \n\t" \
	34	JUMP_TABLE_ENTRY(key, label)
	35
89fd4a1d JZ	36	static __always_inline bool arch_static_branch(struct static_key * const key,
89fd4a1d JZ	37	const bool branch)
ebc00dde	38	{
4356e9f8	39	asm goto(
aecaf181	40	ARCH_STATIC_BRANCH_ASM("%0", "%l[label]")
ebc00dde ERB	41	: : "i"(&((char *)key)[branch]) : : label);
	42
	43	return false;
	44	label:
	45	return true;
	46	}
	47
aecaf181 AR	48	#define ARCH_STATIC_BRANCH_JUMP_ASM(key, label) \
	49	" .align 2 \n\t" \
	50	" .option push \n\t" \
	51	" .option norelax \n\t" \
	52	" .option norvc \n\t" \
	53	"1: j " label " \n\t" \
	54	" .option pop \n\t" \
	55	JUMP_TABLE_ENTRY(key, label)
	56
89fd4a1d JZ	57	static __always_inline bool arch_static_branch_jump(struct static_key * const key,
89fd4a1d JZ	58	const bool branch)
ebc00dde	59	{
4356e9f8	60	asm goto(
aecaf181	61	ARCH_STATIC_BRANCH_JUMP_ASM("%0", "%l[label]")
ebc00dde ERB	62	: : "i"(&((char *)key)[branch]) : : label);
	63
	64	return false;
	65	label:
	66	return true;
	67	}
	68
	69	#endif /* __ASSEMBLY__ */
	70	#endif /* __ASM_JUMP_LABEL_H */