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-rw-r--r--tools/objtool/elf.h157
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 */