63 lines
1.3 KiB
C
63 lines
1.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
|
|
/*
|
|
* Copyright (C) 2013 Huawei Ltd.
|
|
* Author: Jiang Liu <liuj97@gmail.com>
|
|
*
|
|
* Based on arch/arm/include/asm/jump_label.h
|
|
*/
|
|
#ifndef __ASM_JUMP_LABEL_H
|
|
#define __ASM_JUMP_LABEL_H
|
|
|
|
#ifndef __ASSEMBLY__
|
|
|
|
#include <linux/types.h>
|
|
#include <asm/insn.h>
|
|
|
|
#define HAVE_JUMP_LABEL_BATCH
|
|
#define JUMP_LABEL_NOP_SIZE AARCH64_INSN_SIZE
|
|
|
|
#define JUMP_TABLE_ENTRY(key, label) \
|
|
".pushsection __jump_table, \"aw\"\n\t" \
|
|
".align 3\n\t" \
|
|
".long 1b - ., " label " - .\n\t" \
|
|
".quad " key " - .\n\t" \
|
|
".popsection\n\t"
|
|
|
|
/* This macro is also expanded on the Rust side. */
|
|
#define ARCH_STATIC_BRANCH_ASM(key, label) \
|
|
"1: nop\n\t" \
|
|
JUMP_TABLE_ENTRY(key, label)
|
|
|
|
static __always_inline bool arch_static_branch(struct static_key * const key,
|
|
const bool branch)
|
|
{
|
|
char *k = &((char *)key)[branch];
|
|
|
|
asm goto(
|
|
ARCH_STATIC_BRANCH_ASM("%c0", "%l[l_yes]")
|
|
: : "i"(k) : : l_yes
|
|
);
|
|
|
|
return false;
|
|
l_yes:
|
|
return true;
|
|
}
|
|
|
|
static __always_inline bool arch_static_branch_jump(struct static_key * const key,
|
|
const bool branch)
|
|
{
|
|
char *k = &((char *)key)[branch];
|
|
|
|
asm goto(
|
|
"1: b %l[l_yes] \n\t"
|
|
JUMP_TABLE_ENTRY("%c0", "%l[l_yes]")
|
|
: : "i"(k) : : l_yes
|
|
);
|
|
return false;
|
|
l_yes:
|
|
return true;
|
|
}
|
|
|
|
#endif /* __ASSEMBLY__ */
|
|
#endif /* __ASM_JUMP_LABEL_H */
|