/* SPDX-License-Identifier: GPL-2.0 */#include <stdbool.h>#include <stdio.h>#include <stdlib.h>#include <stdarg.h>#include <string.h>#include <sys/types.h>#include <sys/stat.h>#include <sys/mman.h>#include <fcntl.h>#include <unistd.h>#include <elf.h> #include "list.h"#include "elfconfig.h" /* On BSD-alike OSes elf.h defines these according to host's word size */#undef ELF_ST_BIND#undef ELF_ST_TYPE#undef ELF_R_SYM#undef ELF_R_TYPE #if KERNEL_ELFCLASS == ELFCLASS32 #define Elf_Ehdr    Elf32_Ehdr#define Elf_Shdr    Elf32_Shdr#define Elf_Sym     Elf32_Sym#define Elf_Addr    Elf32_Addr#define Elf_Section Elf32_Half#define ELF_ST_BIND ELF32_ST_BIND#define ELF_ST_TYPE ELF32_ST_TYPE #define Elf_Rel     Elf32_Rel#define Elf_Rela    Elf32_Rela#define ELF_R_SYM   ELF32_R_SYM#define ELF_R_TYPE  ELF32_R_TYPE#else #define Elf_Ehdr    Elf64_Ehdr#define Elf_Shdr    Elf64_Shdr#define Elf_Sym     Elf64_Sym#define Elf_Addr    Elf64_Addr#define Elf_Section Elf64_Half#define ELF_ST_BIND ELF64_ST_BIND#define ELF_ST_TYPE ELF64_ST_TYPE #define Elf_Rel     Elf64_Rel#define Elf_Rela    Elf64_Rela#define ELF_R_SYM   ELF64_R_SYM#define ELF_R_TYPE  ELF64_R_TYPE#endif /* The 64-bit MIPS ELF ABI uses an unusual reloc format. */typedef struct{	Elf32_Word    r_sym;	/* Symbol index */	unsigned char r_ssym;	/* Special symbol for 2nd relocation */	unsigned char r_type3;	/* 3rd relocation type */	unsigned char r_type2;	/* 2nd relocation type */	unsigned char r_type1;	/* 1st relocation type */} _Elf64_Mips_R_Info; typedef union{	Elf64_Xword		r_info_number;	_Elf64_Mips_R_Info	r_info_fields;} _Elf64_Mips_R_Info_union; #define ELF64_MIPS_R_SYM(i) \  ((__extension__ (_Elf64_Mips_R_Info_union)(i)).r_info_fields.r_sym) #define ELF64_MIPS_R_TYPE(i) \  ((__extension__ (_Elf64_Mips_R_Info_union)(i)).r_info_fields.r_type1) #if KERNEL_ELFDATA != HOST_ELFDATA static inline void __endian(const void *src, void *dest, unsigned int size){	unsigned int i;	for (i = 0; i < size; i++)		((unsigned char*)dest)[i] = ((unsigned char*)src)[size - i-1];} #define TO_NATIVE(x)						\({								\	typeof(x) __x;						\	__endian(&(x), &(__x), sizeof(__x));			\	__x;							\}) #else /* endianness matches */ #define TO_NATIVE(x) (x) #endif #define NOFAIL(ptr)   do_nofail((ptr), #ptr) #define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0])) void *do_nofail(void *ptr, const char *expr); struct buffer {	char *p;	int pos;	int size;}; void __attribute__((format(printf, 2, 3)))buf_printf(struct buffer *buf, const char *fmt, ...); voidbuf_write(struct buffer *buf, const char *s, int len); struct module {	struct list_head list;	struct list_head exported_symbols;	struct list_head unresolved_symbols;	bool is_gpl_compatible;	bool from_dump;		/* true if module was loaded from *.symvers */	bool is_vmlinux;	bool seen;	bool has_init;	bool has_cleanup;	struct buffer dev_table_buf;	char	     srcversion[25];	// Missing namespace dependencies	struct list_head missing_namespaces;	// Actual imported namespaces	struct list_head imported_namespaces;	char name[];}; struct elf_info {	size_t size;	Elf_Ehdr     *hdr;	Elf_Shdr     *sechdrs;	Elf_Sym      *symtab_start;	Elf_Sym      *symtab_stop;	unsigned int export_symbol_secndx;	/* .export_symbol section */	char         *strtab;	char	     *modinfo;	unsigned int modinfo_len; 	/* support for 32bit section numbers */ 	unsigned int num_sections; /* max_secindex + 1 */	unsigned int secindex_strings;	/* if Nth symbol table entry has .st_shndx = SHN_XINDEX,	 * take shndx from symtab_shndx_start[N] instead */	Elf32_Word   *symtab_shndx_start;	Elf32_Word   *symtab_shndx_stop;}; /* Accessor for sym->st_shndx, hides ugliness of "64k sections" */static inline unsigned int get_secindex(const struct elf_info *info,					const Elf_Sym *sym){	unsigned int index = sym->st_shndx; 	/*	 * Elf{32,64}_Sym::st_shndx is 2 byte. Big section numbers are available	 * in the .symtab_shndx section.	 */	if (index == SHN_XINDEX)		return info->symtab_shndx_start[sym - info->symtab_start]; 	/*	 * Move reserved section indices SHN_LORESERVE..SHN_HIRESERVE out of	 * the way to UINT_MAX-255..UINT_MAX, to avoid conflicting with real	 * section indices.	 */	if (index >= SHN_LORESERVE && index <= SHN_HIRESERVE)		return index - SHN_HIRESERVE - 1; 	return index;} /* file2alias.c */void handle_moddevtable(struct module *mod, struct elf_info *info,			Elf_Sym *sym, const char *symname);void add_moddevtable(struct buffer *buf, struct module *mod); /* sumversion.c */void get_src_version(const char *modname, char sum[], unsigned sumlen); /* from modpost.c */char *read_text_file(const char *filename);char *get_line(char **stringp);void *sym_get_data(const struct elf_info *info, const Elf_Sym *sym); enum loglevel {	LOG_WARN,	LOG_ERROR,	LOG_FATAL}; void modpost_log(enum loglevel loglevel, const char *fmt, ...); /* * warn - show the given message, then let modpost continue running, still *        allowing modpost to exit successfully. This should be used when *        we still allow to generate vmlinux and modules. * * error - show the given message, then let modpost continue running, but fail *         in the end. This should be used when we should stop building vmlinux *         or modules, but we can continue running modpost to catch as many *         issues as possible. * * fatal - show the given message, and bail out immediately. This should be *         used when there is no point to continue running modpost. */#define warn(fmt, args...)	modpost_log(LOG_WARN, fmt, ##args)#define error(fmt, args...)	modpost_log(LOG_ERROR, fmt, ##args)#define fatal(fmt, args...)	modpost_log(LOG_FATAL, fmt, ##args)