tools/objtool/include/objtool/special.h

/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
 * Copyright (C) 2015 Josh Poimboeuf <jpoimboe@redhat.com>
 */

#ifndef _SPECIAL_H
#define _SPECIAL_H

#include <stdbool.h>
#include <objtool/check.h>
#include <objtool/elf.h>

#define C_JUMP_TABLE_SECTION ".data.rel.ro.c_jump_table"

struct special_alt {
	struct list_head list;

	bool group;
	bool jump_or_nop;
	u8 key_addend;

	struct section *orig_sec;
	unsigned long orig_off;

	struct section *new_sec;
	unsigned long new_off;

	unsigned int orig_len, new_len, feature; /* group only */
};

int special_get_alts(struct elf *elf, struct list_head *alts);

void arch_handle_alternative(struct special_alt *alt);

/*
 * Should the reloc at @offset -- the "new" (replacement) field of a special
 * section group entry -- be ignored?  The meaning of a zero-length replacement
 * is arch specific, so the arch decides.
 */
bool arch_alt_ignore_new_reloc(struct section *sec, unsigned long offset);

bool arch_support_alt_relocation(struct special_alt *special_alt,
				 struct instruction *insn,
				 struct reloc *reloc);
struct reloc *arch_find_switch_table(struct objtool_file *file,
				     struct instruction *insn,
				     unsigned long *table_size);
const char *arch_cpu_feature_name(int feature_number);

#endif /* _SPECIAL_H */