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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233234235236237238239240241242243244245/* SPDX-License-Identifier: GPL-2.0 */#include <byteswap.h>#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 "../../include/linux/module_symbol.h"
#include <list_types.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
#define bswap(x) \({ \ _Static_assert(sizeof(x) == 1 || sizeof(x) == 2 || \ sizeof(x) == 4 || sizeof(x) == 8, "bug"); \ (typeof(x))(sizeof(x) == 2 ? bswap_16(x) : \ sizeof(x) == 4 ? bswap_32(x) : \ sizeof(x) == 8 ? bswap_64(x) : \ x); \})
#define TO_NATIVE(x) \ (target_is_big_endian == host_is_big_endian ? x : bswap(x))
#define __get_unaligned_t(type, ptr) ({ \ const struct { type x; } __attribute__((__packed__)) *__pptr = \ (typeof(__pptr))(ptr); \ __pptr->x; \})
#define get_unaligned(ptr) __get_unaligned_t(typeof(*(ptr)), (ptr))
#define get_unaligned_native(ptr) \({ \ typeof(*(ptr)) _val = get_unaligned(ptr); \ TO_NATIVE(_val); \})
#define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]))
#define strstarts(str, prefix) (strncmp(str, prefix, strlen(prefix)) == 0)
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_alias - auto-generated MODULE_ALIAS() * * @node: linked to module::aliases * @modname: name of the builtin module (only for vmlinux) * @str: a string for MODULE_ALIAS() */struct module_alias { struct list_head node; char *builtin_modname; char str[];};
/** * struct module - represent a module (vmlinux or *.ko) * * @dump_file: path to the .symvers file if loaded from a file * @aliases: list head for module_aliases * @no_trim_symbol: .no_trim_symbol section data * @no_trim_symbol_len: length of the .no_trim_symbol section */struct module { struct list_head list; struct list_head exported_symbols; struct list_head unresolved_symbols; const char *dump_file; bool is_gpl_compatible; bool is_vmlinux; bool seen; bool has_init; bool has_cleanup; char srcversion[25]; // Missing namespace dependencies struct list_head missing_namespaces; // Actual imported namespaces struct list_head imported_namespaces; struct list_head aliases; char *no_trim_symbol; unsigned int no_trim_symbol_len; 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; char *no_trim_symbol; unsigned int no_trim_symbol_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;
struct symsearch *symsearch;};
/* 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;}
/* * If there's no name there, ignore it; likewise, ignore it if it's * one of the magic symbols emitted used by current tools. * * Internal symbols created by tools should be ignored by modpost. */static inline bool is_valid_name(struct elf_info *elf, Elf_Sym *sym){ const char *name = elf->strtab + sym->st_name;
if (!name || !strlen(name)) return false; return !is_mapping_symbol(name);}
/* symsearch.c */void symsearch_init(struct elf_info *elf);void symsearch_finish(struct elf_info *elf);Elf_Sym *symsearch_find_nearest(struct elf_info *elf, Elf_Addr addr, unsigned int secndx, bool allow_negative, Elf_Addr min_distance);
/* file2alias.c */void handle_moddevtable(struct module *mod, struct elf_info *info, Elf_Sym *sym, const char *symname);
/* sumversion.c */void get_src_version(const char *modname, char sum[], unsigned sumlen);
/* from modpost.c */extern bool target_is_big_endian;extern bool host_is_big_endian;const char *get_basename(const char *path);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);
void __attribute__((format(printf, 2, 3)))modpost_log(bool is_error, 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(false, fmt, ##args)#define error(fmt, args...) modpost_log(true, fmt, ##args)#define fatal(fmt, args...) do { error(fmt, ##args); exit(1); } while (1)