67 lines
1.7 KiB
C
67 lines
1.7 KiB
C
|
/*
|
||
|
|
* Copyright (C) 2013 Huawei Ltd.
|
||
|
|
* Author: Jiang Liu <liuj97@gmail.com>
|
||
|
|
*
|
||
|
|
* Based on arch/arm/include/asm/jump_label.h
|
||
|
|
*
|
||
|
|
* This program is free software; you can redistribute it and/or modify
|
||
|
|
* it under the terms of the GNU General Public License version 2 as
|
||
|
|
* published by the Free Software Foundation.
|
||
|
|
*
|
||
|
|
* This program is distributed in the hope that it will be useful,
|
||
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||
|
|
* GNU General Public License for more details.
|
||
|
|
*
|
||
|
|
* You should have received a copy of the GNU General Public License
|
||
|
|
* along with this program. If not, see <http://www.gnu.org/licenses/>.
|
||
|
|
*/
|
||
|
|
#ifndef __ASM_JUMP_LABEL_H
|
||
|
|
#define __ASM_JUMP_LABEL_H
|
||
|
|
|
||
|
|
#ifndef __ASSEMBLY__
|
||
|
|
|
||
|
|
#include <linux/types.h>
|
||
|
|
#include <asm/insn.h>
|
||
|
|
|
||
|
|
#define JUMP_LABEL_NOP_SIZE AARCH64_INSN_SIZE
|
||
|
|
|
||
|
|
static __always_inline bool arch_static_branch(struct static_key *key, bool branch)
|
||
|
|
{
|
||
|
|
asm goto("1: nop\n\t"
|
||
|
|
".pushsection __jump_table, \"aw\"\n\t"
|
||
|
|
".align 3\n\t"
|
||
|
|
".quad 1b, %l[l_yes], %c0\n\t"
|
||
|
|
".popsection\n\t"
|
||
|
|
: : "i"(&((char *)key)[branch]) : : l_yes);
|
||
|
|
|
||
|
|
return false;
|
||
|
|
l_yes:
|
||
|
|
return true;
|
||
|
|
}
|
||
|
|
|
||
|
|
static __always_inline bool arch_static_branch_jump(struct static_key *key, bool branch)
|
||
|
|
{
|
||
|
|
asm goto("1: b %l[l_yes]\n\t"
|
||
|
|
".pushsection __jump_table, \"aw\"\n\t"
|
||
|
|
".align 3\n\t"
|
||
|
|
".quad 1b, %l[l_yes], %c0\n\t"
|
||
|
|
".popsection\n\t"
|
||
|
|
: : "i"(&((char *)key)[branch]) : : l_yes);
|
||
|
|
|
||
|
|
return false;
|
||
|
|
l_yes:
|
||
|
|
return true;
|
||
|
|
}
|
||
|
|
|
||
|
|
typedef u64 jump_label_t;
|
||
|
|
|
||
|
|
struct jump_entry {
|
||
|
|
jump_label_t code;
|
||
|
|
jump_label_t target;
|
||
|
|
jump_label_t key;
|
||
|
|
};
|
||
|
|
|
||
|
|
#endif /* __ASSEMBLY__ */
|
||
|
|
#endif /* __ASM_JUMP_LABEL_H */
|