1 /* SPDX-License-Identifier: GPL-2.0 */
2 #include <stdio.h>
3 #include <stdlib.h>
4 #include <stdarg.h>
5 #include <string.h>
6 #include <sys/types.h>
7 #include <sys/stat.h>
8 #include <sys/mman.h>
9 #include <fcntl.h>
10 #include <unistd.h>
11 #include <elf.h>
12
13 #include "elfconfig.h"
14
15 /* On BSD-alike OSes elf.h defines these according to host's word size */
16 #undef ELF_ST_BIND
17 #undef ELF_ST_TYPE
18 #undef ELF_R_SYM
19 #undef ELF_R_TYPE
20
21 #if KERNEL_ELFCLASS == ELFCLASS32
22
23 #define Elf_Ehdr Elf32_Ehdr
24 #define Elf_Shdr Elf32_Shdr
25 #define Elf_Sym Elf32_Sym
26 #define Elf_Addr Elf32_Addr
27 #define Elf_Sword Elf64_Sword
28 #define Elf_Section Elf32_Half
29 #define ELF_ST_BIND ELF32_ST_BIND
30 #define ELF_ST_TYPE ELF32_ST_TYPE
31
32 #define Elf_Rel Elf32_Rel
33 #define Elf_Rela Elf32_Rela
34 #define ELF_R_SYM ELF32_R_SYM
35 #define ELF_R_TYPE ELF32_R_TYPE
36 #else
37
38 #define Elf_Ehdr Elf64_Ehdr
39 #define Elf_Shdr Elf64_Shdr
40 #define Elf_Sym Elf64_Sym
41 #define Elf_Addr Elf64_Addr
42 #define Elf_Sword Elf64_Sxword
43 #define Elf_Section Elf64_Half
44 #define ELF_ST_BIND ELF64_ST_BIND
45 #define ELF_ST_TYPE ELF64_ST_TYPE
46
47 #define Elf_Rel Elf64_Rel
48 #define Elf_Rela Elf64_Rela
49 #define ELF_R_SYM ELF64_R_SYM
50 #define ELF_R_TYPE ELF64_R_TYPE
51 #endif
52
53 /* The 64-bit MIPS ELF ABI uses an unusual reloc format. */
54 typedef struct
55 {
56 Elf32_Word r_sym; /* Symbol index */
57 unsigned char r_ssym; /* Special symbol for 2nd relocation */
58 unsigned char r_type3; /* 3rd relocation type */
59 unsigned char r_type2; /* 2nd relocation type */
60 unsigned char r_type1; /* 1st relocation type */
61 } _Elf64_Mips_R_Info;
62
63 typedef union
64 {
65 Elf64_Xword r_info_number;
66 _Elf64_Mips_R_Info r_info_fields;
67 } _Elf64_Mips_R_Info_union;
68
69 #define ELF64_MIPS_R_SYM(i) \
70 ((__extension__ (_Elf64_Mips_R_Info_union)(i)).r_info_fields.r_sym)
71
72 #define ELF64_MIPS_R_TYPE(i) \
73 ((__extension__ (_Elf64_Mips_R_Info_union)(i)).r_info_fields.r_type1)
74
75 #if KERNEL_ELFDATA != HOST_ELFDATA
76
__endian(const void * src,void * dest,unsigned int size)77 static inline void __endian(const void *src, void *dest, unsigned int size)
78 {
79 unsigned int i;
80 for (i = 0; i < size; i++)
81 ((unsigned char*)dest)[i] = ((unsigned char*)src)[size - i-1];
82 }
83
84 #define TO_NATIVE(x) \
85 ({ \
86 typeof(x) __x; \
87 __endian(&(x), &(__x), sizeof(__x)); \
88 __x; \
89 })
90
91 #else /* endianness matches */
92
93 #define TO_NATIVE(x) (x)
94
95 #endif
96
97 #define NOFAIL(ptr) do_nofail((ptr), #ptr)
98 void *do_nofail(void *ptr, const char *expr);
99
100 struct buffer {
101 char *p;
102 int pos;
103 int size;
104 };
105
106 void __attribute__((format(printf, 2, 3)))
107 buf_printf(struct buffer *buf, const char *fmt, ...);
108
109 void
110 buf_write(struct buffer *buf, const char *s, int len);
111
112 struct namespace_list {
113 struct namespace_list *next;
114 char namespace[0];
115 };
116
117 struct module {
118 struct module *next;
119 const char *name;
120 int gpl_compatible;
121 struct symbol *unres;
122 int seen;
123 int skip;
124 int has_init;
125 int has_cleanup;
126 struct buffer dev_table_buf;
127 char srcversion[25];
128 int is_dot_o;
129 // Required namespace dependencies
130 struct namespace_list *required_namespaces;
131 // Actual imported namespaces
132 struct namespace_list *imported_namespaces;
133 };
134
135 struct elf_info {
136 unsigned long size;
137 Elf_Ehdr *hdr;
138 Elf_Shdr *sechdrs;
139 Elf_Sym *symtab_start;
140 Elf_Sym *symtab_stop;
141 Elf_Section export_sec;
142 Elf_Section export_unused_sec;
143 Elf_Section export_gpl_sec;
144 Elf_Section export_unused_gpl_sec;
145 Elf_Section export_gpl_future_sec;
146 char *ksymtab_strings;
147 char *strtab;
148 char *modinfo;
149 unsigned int modinfo_len;
150
151 /* support for 32bit section numbers */
152
153 unsigned int num_sections; /* max_secindex + 1 */
154 unsigned int secindex_strings;
155 /* if Nth symbol table entry has .st_shndx = SHN_XINDEX,
156 * take shndx from symtab_shndx_start[N] instead */
157 Elf32_Word *symtab_shndx_start;
158 Elf32_Word *symtab_shndx_stop;
159 };
160
is_shndx_special(unsigned int i)161 static inline int is_shndx_special(unsigned int i)
162 {
163 return i != SHN_XINDEX && i >= SHN_LORESERVE && i <= SHN_HIRESERVE;
164 }
165
166 /*
167 * Move reserved section indices SHN_LORESERVE..SHN_HIRESERVE out of
168 * the way to -256..-1, to avoid conflicting with real section
169 * indices.
170 */
171 #define SPECIAL(i) ((i) - (SHN_HIRESERVE + 1))
172
173 /* Accessor for sym->st_shndx, hides ugliness of "64k sections" */
get_secindex(const struct elf_info * info,const Elf_Sym * sym)174 static inline unsigned int get_secindex(const struct elf_info *info,
175 const Elf_Sym *sym)
176 {
177 if (is_shndx_special(sym->st_shndx))
178 return SPECIAL(sym->st_shndx);
179 if (sym->st_shndx != SHN_XINDEX)
180 return sym->st_shndx;
181 return info->symtab_shndx_start[sym - info->symtab_start];
182 }
183
184 /* file2alias.c */
185 extern unsigned int cross_build;
186 void handle_moddevtable(struct module *mod, struct elf_info *info,
187 Elf_Sym *sym, const char *symname);
188 void add_moddevtable(struct buffer *buf, struct module *mod);
189
190 /* sumversion.c */
191 void maybe_frob_rcs_version(const char *modfilename,
192 char *version,
193 void *modinfo,
194 unsigned long modinfo_offset);
195 void get_src_version(const char *modname, char sum[], unsigned sumlen);
196
197 /* from modpost.c */
198 void *grab_file(const char *filename, unsigned long *size);
199 char* get_next_line(unsigned long *pos, void *file, unsigned long size);
200 void release_file(void *file, unsigned long size);
201
202 void fatal(const char *fmt, ...);
203 void warn(const char *fmt, ...);
204 void merror(const char *fmt, ...);
205