145 lines
3.9 KiB
C
145 lines
3.9 KiB
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 _OBJTOOL_ELF_H
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#define _OBJTOOL_ELF_H
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#include <stdio.h>
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#include <gelf.h>
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#include <linux/list.h>
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#include <linux/hashtable.h>
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#include <linux/rbtree.h>
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#include <linux/jhash.h>
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#ifdef LIBELF_USE_DEPRECATED
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# define elf_getshdrnum elf_getshnum
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# define elf_getshdrstrndx elf_getshstrndx
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#endif
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/*
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* Fallback for systems without this "read, mmaping if possible" cmd.
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*/
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#ifndef ELF_C_READ_MMAP
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#define ELF_C_READ_MMAP ELF_C_READ
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#endif
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struct section {
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struct list_head list;
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struct hlist_node hash;
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struct hlist_node name_hash;
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GElf_Shdr sh;
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struct rb_root symbol_tree;
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struct list_head symbol_list;
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struct list_head rela_list;
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struct section *base, *rela;
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struct symbol *sym;
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Elf_Data *data;
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char *name;
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int idx;
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unsigned int len;
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bool changed, text, rodata, noinstr;
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};
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struct symbol {
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struct list_head list;
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struct rb_node node;
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struct hlist_node hash;
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struct hlist_node name_hash;
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GElf_Sym sym;
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struct section *sec;
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char *name;
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unsigned int idx;
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unsigned char bind, type;
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unsigned long offset;
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unsigned int len;
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struct symbol *pfunc, *cfunc, *alias;
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bool uaccess_safe;
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};
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struct rela {
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struct list_head list;
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struct hlist_node hash;
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GElf_Rela rela;
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struct section *sec;
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struct symbol *sym;
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unsigned long offset;
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unsigned int type;
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int addend;
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int idx;
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bool jump_table_start;
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};
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#define ELF_HASH_BITS 20
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struct elf {
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Elf *elf;
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GElf_Ehdr ehdr;
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int fd;
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bool changed;
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char *name;
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struct list_head sections;
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DECLARE_HASHTABLE(symbol_hash, ELF_HASH_BITS);
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DECLARE_HASHTABLE(symbol_name_hash, ELF_HASH_BITS);
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DECLARE_HASHTABLE(section_hash, ELF_HASH_BITS);
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DECLARE_HASHTABLE(section_name_hash, ELF_HASH_BITS);
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DECLARE_HASHTABLE(rela_hash, ELF_HASH_BITS);
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};
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#define OFFSET_STRIDE_BITS 4
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#define OFFSET_STRIDE (1UL << OFFSET_STRIDE_BITS)
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#define OFFSET_STRIDE_MASK (~(OFFSET_STRIDE - 1))
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#define for_offset_range(_offset, _start, _end) \
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for (_offset = ((_start) & OFFSET_STRIDE_MASK); \
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_offset >= ((_start) & OFFSET_STRIDE_MASK) && \
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_offset <= ((_end) & OFFSET_STRIDE_MASK); \
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_offset += OFFSET_STRIDE)
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static inline u32 sec_offset_hash(struct section *sec, unsigned long offset)
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{
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u32 ol, oh, idx = sec->idx;
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offset &= OFFSET_STRIDE_MASK;
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ol = offset;
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oh = (offset >> 16) >> 16;
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__jhash_mix(ol, oh, idx);
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return ol;
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}
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static inline u32 rela_hash(struct rela *rela)
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{
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return sec_offset_hash(rela->sec, rela->offset);
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}
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struct elf *elf_open_read(const char *name, int flags);
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struct section *elf_create_section(struct elf *elf, const char *name, size_t entsize, int nr);
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struct section *elf_create_rela_section(struct elf *elf, struct section *base);
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void elf_add_rela(struct elf *elf, struct rela *rela);
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int elf_write_insn(struct elf *elf, struct section *sec,
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unsigned long offset, unsigned int len,
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const char *insn);
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int elf_write_rela(struct elf *elf, struct rela *rela);
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int elf_write(struct elf *elf);
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void elf_close(struct elf *elf);
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struct section *find_section_by_name(const struct elf *elf, const char *name);
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struct symbol *find_func_by_offset(struct section *sec, unsigned long offset);
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struct symbol *find_symbol_by_offset(struct section *sec, unsigned long offset);
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struct symbol *find_symbol_by_name(const struct elf *elf, const char *name);
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struct symbol *find_symbol_containing(const struct section *sec, unsigned long offset);
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struct rela *find_rela_by_dest(const struct elf *elf, struct section *sec, unsigned long offset);
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struct rela *find_rela_by_dest_range(const struct elf *elf, struct section *sec,
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unsigned long offset, unsigned int len);
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struct symbol *find_func_containing(struct section *sec, unsigned long offset);
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int elf_rebuild_rela_section(struct elf *elf, struct section *sec);
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#define for_each_sec(file, sec) \
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list_for_each_entry(sec, &file->elf->sections, list)
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#endif /* _OBJTOOL_ELF_H */
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