181 lines
4.0 KiB
C
181 lines
4.0 KiB
C
#include <sys/stat.h>
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#include <elf.h>
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#include <stdlib.h>
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#include <sys/mman.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <stdio.h>
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#include <stdarg.h>
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#include <string.h>
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#include "elfconfig.h"
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#if KERNEL_ELFCLASS == ELFCLASS32
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#define Elf_Ehdr Elf32_Ehdr
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#define Elf_Shdr Elf32_Shdr
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#define Elf_Sym Elf32_Sym
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#define Elf_Addr Elf32_Addr
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#define Elf_Section Elf32_Section
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#define ELF_ST_BIND ELF32_ST_BIND
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#define ELF_ST_TYPE ELF32_ST_TYPE
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#define Elf_Rel Elf32_Rel
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#define Elf_Rela Elf32_Rela
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#define ELF_R_SYM ELF32_R_SYM
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#define ELF_R_TYPE ELF32_R_TYPE
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/* It needs to match sizeof within kernel
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* as defined in include/linux/module.h
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*/
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#define ksym_t uint32_t
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#define kstr_t uint32_t
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#define ksym_hash_t uint32_t
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#else
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#define Elf_Ehdr Elf64_Ehdr
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#define Elf_Shdr Elf64_Shdr
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#define Elf_Sym Elf64_Sym
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#define Elf_Addr Elf64_Addr
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#define Elf_Section Elf64_Section
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#define ELF_ST_BIND ELF64_ST_BIND
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#define ELF_ST_TYPE ELF64_ST_TYPE
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#define Elf_Rel Elf64_Rel
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#define Elf_Rela Elf64_Rela
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#define ELF_R_SYM ELF64_R_SYM
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#define ELF_R_TYPE ELF64_R_TYPE
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/* It needs to match sizeof within kernel
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* as defined in include/linux/module.h
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*/
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#define ksym_t uint64_t
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#define kstr_t uint64_t
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#define ksym_hash_t uint64_t
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#endif
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/* The 64-bit MIPS ELF ABI uses an unusual reloc format. */
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typedef struct
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{
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Elf32_Word r_sym; /* Symbol index */
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unsigned char r_ssym; /* Special symbol for 2nd relocation */
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unsigned char r_type3; /* 3rd relocation type */
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unsigned char r_type2; /* 2nd relocation type */
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unsigned char r_type1; /* 1st relocation type */
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} _Elf64_Mips_R_Info;
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typedef union
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{
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Elf64_Xword r_info_number;
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_Elf64_Mips_R_Info r_info_fields;
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} _Elf64_Mips_R_Info_union;
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#define ELF64_MIPS_R_SYM(i) \
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((__extension__ (_Elf64_Mips_R_Info_union)(i)).r_info_fields.r_sym)
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#define ELF64_MIPS_R_TYPE(i) \
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((__extension__ (_Elf64_Mips_R_Info_union)(i)).r_info_fields.r_type1)
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#if KERNEL_ELFDATA != HOST_ELFDATA
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static inline void __endian(const void *src, void *dest, unsigned int size)
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{
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unsigned int i;
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for (i = 0; i < size; i++)
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((unsigned char *)dest)[i] =
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((unsigned char *)src)[size - i - 1];
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}
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#define TO_NATIVE(x) \
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({ \
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typeof(x) __x; \
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__endian(&(x), &(__x), sizeof(__x)); \
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__x; \
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})
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#else /* endianness matches */
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#define TO_NATIVE(x) (x)
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#endif
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#define GET_KSTRING(__ksym, __offset) (unsigned char *)(__ksym->name + __offset)
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/* We have no more than 5 kernel symbol tables
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__ksymtab
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__ksymtab_gpl
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__ksymtab_unused
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__ksymtab_unused_gpl
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__ksymtab_gpl_future
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*/
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enum ksymtab_type {
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KSYMTAB = 0,
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KSYMTAB_GPL,
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KSYMTAB_UNUSED,
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KSYMTAB_UNUSED_GPL,
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KSYMTAB_GPL_FUTURE,
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KSYMTAB_ALL,
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};
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/*
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* This maps the ELF hash table
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* The entries in the .hash table always have a size of 32 bits.
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*/
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struct elf_htable {
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uint32_t nbucket;
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uint32_t nchain;
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uint32_t *elf_buckets;
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uint32_t *chains;
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};
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/* as defined in include/linux/module.h */
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struct kernel_symbol {
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ksym_t value;
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kstr_t name;
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ksym_hash_t hash_value;
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};
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struct kernel_symtab {
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const char *name;
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struct kernel_symbol *start;
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struct kernel_symbol *stop;
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Elf_Section sec;
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};
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struct elf_info {
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unsigned long size;
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Elf_Ehdr *hdr;
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Elf_Shdr *sechdrs;
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Elf_Sym *symtab_start;
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Elf_Sym *symtab_stop;
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long kstr_offset;
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unsigned long base_addr;
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struct {
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ksym_hash_t *start;
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ksym_hash_t *stop;
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} undef_hash;
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struct kernel_symtab ksym_tables[KSYMTAB_ALL];
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Elf_Section markers_strings_sec;
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const char *strtab;
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const char *kstrings;
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char *modinfo;
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unsigned int modinfo_len;
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};
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/* from elflib.c */
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void fatal(const char *fmt, ...);
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void warn(const char *fmt, ...);
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void merror(const char *fmt, ...);
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ksym_hash_t gnu_hash(const unsigned char *name);
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void *grab_file(const char *filename, unsigned long *size);
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void release_file(void *file, unsigned long size);
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int parse_elf(struct elf_info *info, const char *filename);
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int parse_writable_elf(struct elf_info *info, const char *filename);
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void parse_elf_finish(struct elf_info *info);
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