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/* SPDX-License-Identifier: GPL-2.0-only */
/*
* Copyright (C) 2025 Chen Miao
*
* Based on arch/arm/include/asm/jump_label.h
*/
#ifndef __ASM_OPENRISC_JUMP_LABEL_H
#define __ASM_OPENRISC_JUMP_LABEL_H
#ifndef __ASSEMBLER__
#include <linux/types.h>
#include <asm/insn-def.h>
#define HAVE_JUMP_LABEL_BATCH
#define JUMP_LABEL_NOP_SIZE OPENRISC_INSN_SIZE
/**
* JUMP_TABLE_ENTRY - Create a jump table entry
* @key: Jump key identifier (typically a symbol address)
* @label: Target label address
*
* This macro creates a jump table entry in the dedicated kernel section (__jump_table).
* Each entry contains the following information:
* Offset from current instruction to jump instruction (1b - .)
* Offset from current instruction to target label (label - .)
* Offset from current instruction to key identifier (key - .)
*/
#define JUMP_TABLE_ENTRY(key, label) \
".pushsection __jump_table, \"aw\" \n\t" \
".align 4 \n\t" \
".long 1b - ., " label " - . \n\t" \
".long " key " - . \n\t" \
".popsection \n\t"
#define ARCH_STATIC_BRANCH_ASM(key, label) \
".align 4 \n\t" \
"1: l.nop \n\t" \
" l.nop \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[l_yes]")
::"i"(&((char *)key)[branch])::l_yes);
return false;
l_yes:
return true;
}
#define ARCH_STATIC_BRANCH_JUMP_ASM(key, label) \
".align 4 \n\t" \
"1: l.j " label " \n\t" \
" l.nop \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[l_yes]")
::"i"(&((char *)key)[branch])::l_yes);
return false;
l_yes:
return true;
}
#endif /* __ASSEMBLER__ */
#endif /* __ASM_OPENRISC_JUMP_LABEL_H */
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