1 /* SPDX-License-Identifier: GPL-2.0-or-later */
3 * Copyright (C) 2015 Josh Poimboeuf <jpoimboe@redhat.com>
11 #include <linux/list.h>
12 #include <linux/hashtable.h>
13 #include <linux/rbtree.h>
14 #include <linux/jhash.h>
16 #ifdef LIBELF_USE_DEPRECATED
17 # define elf_getshdrnum elf_getshnum
18 # define elf_getshdrstrndx elf_getshstrndx
22 * Fallback for systems without this "read, mmaping if possible" cmd.
24 #ifndef ELF_C_READ_MMAP
25 #define ELF_C_READ_MMAP ELF_C_READ
29 struct list_head list;
30 struct hlist_node hash;
31 struct hlist_node name_hash;
33 struct rb_root_cached symbol_tree;
34 struct list_head symbol_list;
35 struct list_head reloc_list;
36 struct section *base, *reloc;
41 bool changed, text, rodata, noinstr, init, truncate;
45 struct list_head list;
47 struct hlist_node hash;
48 struct hlist_node name_hash;
53 unsigned char bind, type;
56 unsigned long __subtree_last;
57 struct symbol *pfunc, *cfunc, *alias;
59 u8 static_call_tramp : 1;
60 u8 retpoline_thunk : 1;
63 u8 profiling_func : 1;
64 struct list_head pv_target;
65 struct list_head reloc_list;
69 struct list_head list;
70 struct hlist_node hash;
77 struct list_head sym_reloc_entry;
82 bool jump_table_start;
85 #define ELF_HASH_BITS 20
93 unsigned int text_size, num_files;
94 struct list_head sections;
99 int section_name_bits;
102 struct hlist_head *symbol_hash;
103 struct hlist_head *symbol_name_hash;
104 struct hlist_head *section_hash;
105 struct hlist_head *section_name_hash;
106 struct hlist_head *reloc_hash;
109 #define OFFSET_STRIDE_BITS 4
110 #define OFFSET_STRIDE (1UL << OFFSET_STRIDE_BITS)
111 #define OFFSET_STRIDE_MASK (~(OFFSET_STRIDE - 1))
113 #define for_offset_range(_offset, _start, _end) \
114 for (_offset = ((_start) & OFFSET_STRIDE_MASK); \
115 _offset >= ((_start) & OFFSET_STRIDE_MASK) && \
116 _offset <= ((_end) & OFFSET_STRIDE_MASK); \
117 _offset += OFFSET_STRIDE)
119 static inline u32 sec_offset_hash(struct section *sec, unsigned long offset)
121 u32 ol, oh, idx = sec->idx;
123 offset &= OFFSET_STRIDE_MASK;
126 oh = (offset >> 16) >> 16;
128 __jhash_mix(ol, oh, idx);
133 static inline u32 reloc_hash(struct reloc *reloc)
135 return sec_offset_hash(reloc->sec, reloc->offset);
139 * Try to see if it's a whole archive (vmlinux.o or module).
141 * Note this will miss the case where a module only has one source file.
143 static inline bool has_multiple_files(struct elf *elf)
145 return elf->num_files > 1;
148 static inline int elf_class_addrsize(struct elf *elf)
150 if (elf->ehdr.e_ident[EI_CLASS] == ELFCLASS32)
156 struct elf *elf_open_read(const char *name, int flags);
157 struct section *elf_create_section(struct elf *elf, const char *name, unsigned int sh_flags, size_t entsize, int nr);
159 struct symbol *elf_create_prefix_symbol(struct elf *elf, struct symbol *orig, long size);
161 int elf_add_reloc(struct elf *elf, struct section *sec, unsigned long offset,
162 unsigned int type, struct symbol *sym, s64 addend);
163 int elf_add_reloc_to_insn(struct elf *elf, struct section *sec,
164 unsigned long offset, unsigned int type,
165 struct section *insn_sec, unsigned long insn_off);
167 int elf_write_insn(struct elf *elf, struct section *sec,
168 unsigned long offset, unsigned int len,
170 int elf_write_reloc(struct elf *elf, struct reloc *reloc);
171 int elf_write(struct elf *elf);
172 void elf_close(struct elf *elf);
174 struct section *find_section_by_name(const struct elf *elf, const char *name);
175 struct symbol *find_func_by_offset(struct section *sec, unsigned long offset);
176 struct symbol *find_symbol_by_offset(struct section *sec, unsigned long offset);
177 struct symbol *find_symbol_by_name(const struct elf *elf, const char *name);
178 struct symbol *find_symbol_containing(const struct section *sec, unsigned long offset);
179 int find_symbol_hole_containing(const struct section *sec, unsigned long offset);
180 struct reloc *find_reloc_by_dest(const struct elf *elf, struct section *sec, unsigned long offset);
181 struct reloc *find_reloc_by_dest_range(const struct elf *elf, struct section *sec,
182 unsigned long offset, unsigned int len);
183 struct symbol *find_func_containing(struct section *sec, unsigned long offset);
185 #define for_each_sec(file, sec) \
186 list_for_each_entry(sec, &file->elf->sections, list)
188 #endif /* _OBJTOOL_ELF_H */