1 /* SPDX-License-Identifier: GPL-2.0 */
14 #include "../../include/linux/module_symbol.h"
16 #include <list_types.h>
17 #include "elfconfig.h"
19 /* On BSD-alike OSes elf.h defines these according to host's word size */
25 #if KERNEL_ELFCLASS == ELFCLASS32
27 #define Elf_Ehdr Elf32_Ehdr
28 #define Elf_Shdr Elf32_Shdr
29 #define Elf_Sym Elf32_Sym
30 #define Elf_Addr Elf32_Addr
31 #define Elf_Section Elf32_Half
32 #define ELF_ST_BIND ELF32_ST_BIND
33 #define ELF_ST_TYPE ELF32_ST_TYPE
35 #define Elf_Rel Elf32_Rel
36 #define Elf_Rela Elf32_Rela
37 #define ELF_R_SYM ELF32_R_SYM
38 #define ELF_R_TYPE ELF32_R_TYPE
41 #define Elf_Ehdr Elf64_Ehdr
42 #define Elf_Shdr Elf64_Shdr
43 #define Elf_Sym Elf64_Sym
44 #define Elf_Addr Elf64_Addr
45 #define Elf_Section Elf64_Half
46 #define ELF_ST_BIND ELF64_ST_BIND
47 #define ELF_ST_TYPE ELF64_ST_TYPE
49 #define Elf_Rel Elf64_Rel
50 #define Elf_Rela Elf64_Rela
51 #define ELF_R_SYM ELF64_R_SYM
52 #define ELF_R_TYPE ELF64_R_TYPE
57 _Static_assert(sizeof(x) == 1 || sizeof(x) == 2 || \
58 sizeof(x) == 4 || sizeof(x) == 8, "bug"); \
59 (typeof(x))(sizeof(x) == 2 ? bswap_16(x) : \
60 sizeof(x) == 4 ? bswap_32(x) : \
61 sizeof(x) == 8 ? bswap_64(x) : \
65 #define TO_NATIVE(x) \
66 (target_is_big_endian == host_is_big_endian ? x : bswap(x))
68 #define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]))
76 void __attribute__((format(printf, 2, 3)))
77 buf_printf(struct buffer *buf, const char *fmt, ...);
80 buf_write(struct buffer *buf, const char *s, int len);
83 struct list_head list;
84 struct list_head exported_symbols;
85 struct list_head unresolved_symbols;
86 bool is_gpl_compatible;
87 bool from_dump; /* true if module was loaded from *.symvers */
92 struct buffer dev_table_buf;
94 // Missing namespace dependencies
95 struct list_head missing_namespaces;
96 // Actual imported namespaces
97 struct list_head imported_namespaces;
105 Elf_Sym *symtab_start;
106 Elf_Sym *symtab_stop;
107 unsigned int export_symbol_secndx; /* .export_symbol section */
110 unsigned int modinfo_len;
112 /* support for 32bit section numbers */
114 unsigned int num_sections; /* max_secindex + 1 */
115 unsigned int secindex_strings;
116 /* if Nth symbol table entry has .st_shndx = SHN_XINDEX,
117 * take shndx from symtab_shndx_start[N] instead */
118 Elf32_Word *symtab_shndx_start;
119 Elf32_Word *symtab_shndx_stop;
121 struct symsearch *symsearch;
124 /* Accessor for sym->st_shndx, hides ugliness of "64k sections" */
125 static inline unsigned int get_secindex(const struct elf_info *info,
128 unsigned int index = sym->st_shndx;
131 * Elf{32,64}_Sym::st_shndx is 2 byte. Big section numbers are available
132 * in the .symtab_shndx section.
134 if (index == SHN_XINDEX)
135 return info->symtab_shndx_start[sym - info->symtab_start];
138 * Move reserved section indices SHN_LORESERVE..SHN_HIRESERVE out of
139 * the way to UINT_MAX-255..UINT_MAX, to avoid conflicting with real
142 if (index >= SHN_LORESERVE && index <= SHN_HIRESERVE)
143 return index - SHN_HIRESERVE - 1;
149 * If there's no name there, ignore it; likewise, ignore it if it's
150 * one of the magic symbols emitted used by current tools.
152 * Internal symbols created by tools should be ignored by modpost.
154 static inline bool is_valid_name(struct elf_info *elf, Elf_Sym *sym)
156 const char *name = elf->strtab + sym->st_name;
158 if (!name || !strlen(name))
160 return !is_mapping_symbol(name);
164 void symsearch_init(struct elf_info *elf);
165 void symsearch_finish(struct elf_info *elf);
166 Elf_Sym *symsearch_find_nearest(struct elf_info *elf, Elf_Addr addr,
167 unsigned int secndx, bool allow_negative,
168 Elf_Addr min_distance);
171 void handle_moddevtable(struct module *mod, struct elf_info *info,
172 Elf_Sym *sym, const char *symname);
173 void add_moddevtable(struct buffer *buf, struct module *mod);
176 void get_src_version(const char *modname, char sum[], unsigned sumlen);
179 extern bool target_is_big_endian;
180 extern bool host_is_big_endian;
181 char *read_text_file(const char *filename);
182 char *get_line(char **stringp);
183 void *sym_get_data(const struct elf_info *info, const Elf_Sym *sym);
185 void __attribute__((format(printf, 2, 3)))
186 modpost_log(bool is_error, const char *fmt, ...);
189 * warn - show the given message, then let modpost continue running, still
190 * allowing modpost to exit successfully. This should be used when
191 * we still allow to generate vmlinux and modules.
193 * error - show the given message, then let modpost continue running, but fail
194 * in the end. This should be used when we should stop building vmlinux
195 * or modules, but we can continue running modpost to catch as many
196 * issues as possible.
198 * fatal - show the given message, and bail out immediately. This should be
199 * used when there is no point to continue running modpost.
201 #define warn(fmt, args...) modpost_log(false, fmt, ##args)
202 #define error(fmt, args...) modpost_log(true, fmt, ##args)
203 #define fatal(fmt, args...) do { error(fmt, ##args); exit(1); } while (1)