1 /* SPDX-License-Identifier: GPL-2.0-or-later */ 2 /* 3 * Copyright (C) 2015 Josh Poimboeuf <jpoimboe@redhat.com> 4 */ 5 6 #ifndef _SPECIAL_H 7 #define _SPECIAL_H 8 9 #include <stdbool.h> 10 #include <objtool/check.h> 11 #include <objtool/elf.h> 12 13 #define C_JUMP_TABLE_SECTION ".rodata..c_jump_table" 14 15 struct special_alt { 16 struct list_head list; 17 18 bool group; 19 bool skip_orig; 20 bool skip_alt; 21 bool jump_or_nop; 22 23 struct section *orig_sec; 24 unsigned long orig_off; 25 26 struct section *new_sec; 27 unsigned long new_off; 28 29 unsigned int orig_len, new_len; /* group only */ 30 u8 key_addend; 31 }; 32 33 int special_get_alts(struct elf *elf, struct list_head *alts); 34 35 void arch_handle_alternative(unsigned short feature, struct special_alt *alt); 36 37 bool arch_support_alt_relocation(struct special_alt *special_alt, 38 struct instruction *insn, 39 struct reloc *reloc); 40 struct reloc *arch_find_switch_table(struct objtool_file *file, 41 struct instruction *insn); 42 #endif /* _SPECIAL_H */ 43