220 lines
5.7 KiB
C
220 lines
5.7 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#include <stdbool.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <stdarg.h>
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#include <string.h>
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#include <sys/types.h>
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#include <sys/stat.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 <elf.h>
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#include "list.h"
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#include "elfconfig.h"
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/* On BSD-alike OSes elf.h defines these according to host's word size */
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#undef ELF_ST_BIND
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#undef ELF_ST_TYPE
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#undef ELF_R_SYM
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#undef ELF_R_TYPE
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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_Half
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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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#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_Half
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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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#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] = ((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 NOFAIL(ptr) do_nofail((ptr), #ptr)
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#define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]))
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void *do_nofail(void *ptr, const char *expr);
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struct buffer {
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char *p;
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int pos;
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int size;
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};
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void __attribute__((format(printf, 2, 3)))
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buf_printf(struct buffer *buf, const char *fmt, ...);
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void
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buf_write(struct buffer *buf, const char *s, int len);
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struct module {
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struct list_head list;
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struct list_head exported_symbols;
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struct list_head unresolved_symbols;
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bool is_gpl_compatible;
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bool from_dump; /* true if module was loaded from *.symvers */
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bool is_vmlinux;
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bool seen;
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bool has_init;
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bool has_cleanup;
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struct buffer dev_table_buf;
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char srcversion[25];
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// Missing namespace dependencies
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struct list_head missing_namespaces;
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// Actual imported namespaces
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struct list_head imported_namespaces;
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char name[];
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};
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struct elf_info {
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size_t 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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char *strtab;
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char *modinfo;
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unsigned int modinfo_len;
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/* support for 32bit section numbers */
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unsigned int num_sections; /* max_secindex + 1 */
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unsigned int secindex_strings;
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/* if Nth symbol table entry has .st_shndx = SHN_XINDEX,
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* take shndx from symtab_shndx_start[N] instead */
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Elf32_Word *symtab_shndx_start;
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Elf32_Word *symtab_shndx_stop;
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};
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static inline int is_shndx_special(unsigned int i)
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{
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return i != SHN_XINDEX && i >= SHN_LORESERVE && i <= SHN_HIRESERVE;
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}
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/* Accessor for sym->st_shndx, hides ugliness of "64k sections" */
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static inline unsigned int get_secindex(const struct elf_info *info,
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const Elf_Sym *sym)
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{
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unsigned int index = sym->st_shndx;
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/*
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* Elf{32,64}_Sym::st_shndx is 2 byte. Big section numbers are available
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* in the .symtab_shndx section.
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*/
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if (index == SHN_XINDEX)
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return info->symtab_shndx_start[sym - info->symtab_start];
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/*
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* Move reserved section indices SHN_LORESERVE..SHN_HIRESERVE out of
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* the way to UINT_MAX-255..UINT_MAX, to avoid conflicting with real
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* section indices.
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*/
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if (index >= SHN_LORESERVE && index <= SHN_HIRESERVE)
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return index - SHN_HIRESERVE - 1;
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return index;
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}
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/* file2alias.c */
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void handle_moddevtable(struct module *mod, struct elf_info *info,
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Elf_Sym *sym, const char *symname);
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void add_moddevtable(struct buffer *buf, struct module *mod);
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/* sumversion.c */
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void get_src_version(const char *modname, char sum[], unsigned sumlen);
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/* from modpost.c */
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char *read_text_file(const char *filename);
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char *get_line(char **stringp);
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void *sym_get_data(const struct elf_info *info, const Elf_Sym *sym);
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enum loglevel {
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LOG_WARN,
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LOG_ERROR,
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LOG_FATAL
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};
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void modpost_log(enum loglevel loglevel, const char *fmt, ...);
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/*
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* warn - show the given message, then let modpost continue running, still
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* allowing modpost to exit successfully. This should be used when
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* we still allow to generate vmlinux and modules.
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*
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* error - show the given message, then let modpost continue running, but fail
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* in the end. This should be used when we should stop building vmlinux
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* or modules, but we can continue running modpost to catch as many
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* issues as possible.
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*
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* fatal - show the given message, and bail out immediately. This should be
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* used when there is no point to continue running modpost.
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*/
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#define warn(fmt, args...) modpost_log(LOG_WARN, fmt, ##args)
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#define error(fmt, args...) modpost_log(LOG_ERROR, fmt, ##args)
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#define fatal(fmt, args...) modpost_log(LOG_FATAL, fmt, ##args)
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