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Diffstat (limited to 'tools/objtool/elf.h')
| -rw-r--r-- | tools/objtool/elf.h | 157 |
1 files changed, 157 insertions, 0 deletions
diff --git a/tools/objtool/elf.h b/tools/objtool/elf.h new file mode 100644 index 000000000..19446d911 --- /dev/null +++ b/tools/objtool/elf.h @@ -0,0 +1,157 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + * Copyright (C) 2015 Josh Poimboeuf <jpoimboe@redhat.com> + */ + +#ifndef _OBJTOOL_ELF_H +#define _OBJTOOL_ELF_H + +#include <stdio.h> +#include <gelf.h> +#include <linux/list.h> +#include <linux/hashtable.h> +#include <linux/rbtree.h> +#include <linux/jhash.h> + +#ifdef LIBELF_USE_DEPRECATED +# define elf_getshdrnum elf_getshnum +# define elf_getshdrstrndx elf_getshstrndx +#endif + +/* + * Fallback for systems without this "read, mmaping if possible" cmd. + */ +#ifndef ELF_C_READ_MMAP +#define ELF_C_READ_MMAP ELF_C_READ +#endif + +struct section { + struct list_head list; + struct hlist_node hash; + struct hlist_node name_hash; + GElf_Shdr sh; + struct rb_root symbol_tree; + struct list_head symbol_list; + struct list_head reloc_list; + struct section *base, *reloc; + struct symbol *sym; + Elf_Data *data; + char *name; + int idx; + unsigned int len; + bool changed, text, rodata, noinstr; +}; + +struct symbol { + struct list_head list; + struct rb_node node; + struct hlist_node hash; + struct hlist_node name_hash; + GElf_Sym sym; + struct section *sec; + char *name; + unsigned int idx; + unsigned char bind, type; + unsigned long offset; + unsigned int len; + struct symbol *pfunc, *cfunc, *alias; + u8 uaccess_safe : 1; + u8 static_call_tramp : 1; + u8 retpoline_thunk : 1; + u8 return_thunk : 1; + u8 fentry : 1; + u8 kcov : 1; + u8 embedded_insn : 1; +}; + +struct reloc { + struct list_head list; + struct hlist_node hash; + union { + GElf_Rela rela; + GElf_Rel rel; + }; + struct section *sec; + struct symbol *sym; + unsigned long offset; + unsigned int type; + s64 addend; + int idx; + bool jump_table_start; +}; + +#define ELF_HASH_BITS 20 + +struct elf { + Elf *elf; + GElf_Ehdr ehdr; + int fd; + bool changed; + char *name; + struct list_head sections; + DECLARE_HASHTABLE(symbol_hash, ELF_HASH_BITS); + DECLARE_HASHTABLE(symbol_name_hash, ELF_HASH_BITS); + DECLARE_HASHTABLE(section_hash, ELF_HASH_BITS); + DECLARE_HASHTABLE(section_name_hash, ELF_HASH_BITS); + DECLARE_HASHTABLE(reloc_hash, ELF_HASH_BITS); +}; + +#define OFFSET_STRIDE_BITS 4 +#define OFFSET_STRIDE (1UL << OFFSET_STRIDE_BITS) +#define OFFSET_STRIDE_MASK (~(OFFSET_STRIDE - 1)) + +#define for_offset_range(_offset, _start, _end) \ + for (_offset = ((_start) & OFFSET_STRIDE_MASK); \ + _offset >= ((_start) & OFFSET_STRIDE_MASK) && \ + _offset <= ((_end) & OFFSET_STRIDE_MASK); \ + _offset += OFFSET_STRIDE) + +static inline u32 sec_offset_hash(struct section *sec, unsigned long offset) +{ + u32 ol, oh, idx = sec->idx; + + offset &= OFFSET_STRIDE_MASK; + + ol = offset; + oh = (offset >> 16) >> 16; + + __jhash_mix(ol, oh, idx); + + return ol; +} + +static inline u32 reloc_hash(struct reloc *reloc) +{ + return sec_offset_hash(reloc->sec, reloc->offset); +} + +struct elf *elf_open_read(const char *name, int flags); +struct section *elf_create_section(struct elf *elf, const char *name, unsigned int sh_flags, size_t entsize, int nr); + +int elf_add_reloc(struct elf *elf, struct section *sec, unsigned long offset, + unsigned int type, struct symbol *sym, s64 addend); +int elf_add_reloc_to_insn(struct elf *elf, struct section *sec, + unsigned long offset, unsigned int type, + struct section *insn_sec, unsigned long insn_off); + +int elf_write_insn(struct elf *elf, struct section *sec, + unsigned long offset, unsigned int len, + const char *insn); +int elf_write_reloc(struct elf *elf, struct reloc *reloc); +int elf_write(struct elf *elf); +void elf_close(struct elf *elf); + +struct section *find_section_by_name(const struct elf *elf, const char *name); +struct symbol *find_func_by_offset(struct section *sec, unsigned long offset); +struct symbol *find_symbol_by_offset(struct section *sec, unsigned long offset); +struct symbol *find_symbol_by_name(const struct elf *elf, const char *name); +struct symbol *find_symbol_containing(const struct section *sec, unsigned long offset); +struct reloc *find_reloc_by_dest(const struct elf *elf, struct section *sec, unsigned long offset); +struct reloc *find_reloc_by_dest_range(const struct elf *elf, struct section *sec, + unsigned long offset, unsigned int len); +struct symbol *find_func_containing(struct section *sec, unsigned long offset); + +#define for_each_sec(file, sec) \ + list_for_each_entry(sec, &file->elf->sections, list) + +#endif /* _OBJTOOL_ELF_H */ |