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c3cb6c158c
In preparation for adding support for annotated jump tables, where ELF relocations and symbols are used to describe the locations of jump tables in the executable, refactor the jump table discovery logic so the table size can be returned from arch_find_switch_table(). Signed-off-by: Ard Biesheuvel <ardb@kernel.org> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Link: https://lkml.kernel.org/r/20241011170847.334429-12-ardb+git@google.com
44 lines
996 B
C
44 lines
996 B
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
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/*
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* Copyright (C) 2015 Josh Poimboeuf <jpoimboe@redhat.com>
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*/
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#ifndef _SPECIAL_H
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#define _SPECIAL_H
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#include <stdbool.h>
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#include <objtool/check.h>
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#include <objtool/elf.h>
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#define C_JUMP_TABLE_SECTION ".rodata..c_jump_table"
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struct special_alt {
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struct list_head list;
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bool group;
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bool skip_orig;
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bool skip_alt;
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bool jump_or_nop;
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u8 key_addend;
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struct section *orig_sec;
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unsigned long orig_off;
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struct section *new_sec;
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unsigned long new_off;
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unsigned int orig_len, new_len; /* group only */
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};
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int special_get_alts(struct elf *elf, struct list_head *alts);
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void arch_handle_alternative(unsigned short feature, struct special_alt *alt);
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bool arch_support_alt_relocation(struct special_alt *special_alt,
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struct instruction *insn,
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struct reloc *reloc);
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struct reloc *arch_find_switch_table(struct objtool_file *file,
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struct instruction *insn,
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unsigned long *table_size);
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#endif /* _SPECIAL_H */
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