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/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _ASM_X86_JUMP_LABEL_H
#define _ASM_X86_JUMP_LABEL_H
#define HAVE_JUMP_LABEL_BATCH
#include <asm/asm.h>
#include <asm/nops.h>
#ifndef __ASSEMBLY__
#include <linux/stringify.h>
#include <linux/types.h>
#define JUMP_TABLE_ENTRY \
".pushsection __jump_table, \"aw\" \n\t" \
_ASM_ALIGN "\n\t" \
".long 1b - . \n\t" \
".long %l[l_yes] - . \n\t" \
_ASM_PTR "%c0 + %c1 - .\n\t" \
".popsection \n\t"
#ifdef CONFIG_HAVE_JUMP_LABEL_HACK
static __always_inline bool arch_static_branch(struct static_key *key, bool branch)
{
asm goto("1:"
"jmp %l[l_yes] # objtool NOPs this \n\t"
JUMP_TABLE_ENTRY
: : "i" (key), "i" (2 | branch) : : l_yes);
return false;
l_yes:
return true;
}
#else /* !CONFIG_HAVE_JUMP_LABEL_HACK */
static __always_inline bool arch_static_branch(struct static_key * const key, const bool branch)
{
asm goto("1:"
".byte " __stringify(BYTES_NOP5) "\n\t"
JUMP_TABLE_ENTRY
: : "i" (key), "i" (branch) : : l_yes);
return false;
l_yes:
return true;
}
#endif /* CONFIG_HAVE_JUMP_LABEL_HACK */
static __always_inline bool arch_static_branch_jump(struct static_key * const key, const bool branch)
{
asm goto("1:"
"jmp %l[l_yes]\n\t"
JUMP_TABLE_ENTRY
: : "i" (key), "i" (branch) : : l_yes);
return false;
l_yes:
return true;
}
extern int arch_jump_entry_size(struct jump_entry *entry);
#endif /* __ASSEMBLY__ */
#endif