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git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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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
128 lines
2.8 KiB
C
128 lines
2.8 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
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/*
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* Copyright (C) 2017 Josh Poimboeuf <jpoimboe@redhat.com>
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*/
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#ifndef _CHECK_H
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#define _CHECK_H
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#include <stdbool.h>
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#include <objtool/cfi.h>
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#include <objtool/arch.h>
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struct insn_state {
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struct cfi_state cfi;
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unsigned int uaccess_stack;
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bool uaccess;
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bool df;
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bool noinstr;
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s8 instr;
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};
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struct alt_group {
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/*
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* Pointer from a replacement group to the original group. NULL if it
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* *is* the original group.
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*/
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struct alt_group *orig_group;
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/* First and last instructions in the group */
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struct instruction *first_insn, *last_insn, *nop;
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/*
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* Byte-offset-addressed len-sized array of pointers to CFI structs.
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* This is shared with the other alt_groups in the same alternative.
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*/
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struct cfi_state **cfi;
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};
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#define INSN_CHUNK_BITS 8
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#define INSN_CHUNK_SIZE (1 << INSN_CHUNK_BITS)
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#define INSN_CHUNK_MAX (INSN_CHUNK_SIZE - 1)
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struct instruction {
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struct hlist_node hash;
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struct list_head call_node;
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struct section *sec;
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unsigned long offset;
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unsigned long immediate;
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u8 len;
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u8 prev_len;
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u8 type;
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s8 instr;
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u32 idx : INSN_CHUNK_BITS,
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dead_end : 1,
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ignore : 1,
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ignore_alts : 1,
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hint : 1,
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save : 1,
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restore : 1,
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retpoline_safe : 1,
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noendbr : 1,
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unret : 1,
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visited : 4,
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no_reloc : 1;
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/* 10 bit hole */
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struct alt_group *alt_group;
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struct instruction *jump_dest;
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struct instruction *first_jump_src;
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union {
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struct symbol *_call_dest;
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struct {
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struct reloc *_jump_table;
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unsigned long _jump_table_size;
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};
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};
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struct alternative *alts;
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struct symbol *sym;
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struct stack_op *stack_ops;
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struct cfi_state *cfi;
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};
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static inline struct symbol *insn_func(struct instruction *insn)
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{
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struct symbol *sym = insn->sym;
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if (sym && sym->type != STT_FUNC)
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sym = NULL;
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return sym;
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}
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#define VISITED_BRANCH 0x01
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#define VISITED_BRANCH_UACCESS 0x02
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#define VISITED_BRANCH_MASK 0x03
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#define VISITED_UNRET 0x04
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static inline bool is_static_jump(struct instruction *insn)
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{
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return insn->type == INSN_JUMP_CONDITIONAL ||
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insn->type == INSN_JUMP_UNCONDITIONAL;
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}
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static inline bool is_dynamic_jump(struct instruction *insn)
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{
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return insn->type == INSN_JUMP_DYNAMIC ||
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insn->type == INSN_JUMP_DYNAMIC_CONDITIONAL;
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}
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static inline bool is_jump(struct instruction *insn)
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{
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return is_static_jump(insn) || is_dynamic_jump(insn);
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}
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struct instruction *find_insn(struct objtool_file *file,
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struct section *sec, unsigned long offset);
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struct instruction *next_insn_same_sec(struct objtool_file *file, struct instruction *insn);
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#define sec_for_each_insn(file, _sec, insn) \
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for (insn = find_insn(file, _sec, 0); \
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insn && insn->sec == _sec; \
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insn = next_insn_same_sec(file, insn))
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#endif /* _CHECK_H */
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