1 #include <stdio.h>
2 #include <stdlib.h>
3 #include <stdarg.h>
4 #include <string.h>
5 #include <sys/types.h>
6 #include <sys/stat.h>
7 #include <sys/mman.h>
8 #include <fcntl.h>
9 #include <unistd.h>
10 #include <elf.h>
11
12 #include "elfconfig.h"
13
14 #if KERNEL_ELFCLASS == ELFCLASS32
15
16 #define Elf_Ehdr Elf32_Ehdr
17 #define Elf_Shdr Elf32_Shdr
18 #define Elf_Sym Elf32_Sym
19 #define Elf_Addr Elf32_Addr
20 #define Elf_Sword Elf64_Sword
21 #define Elf_Section Elf32_Half
22 #define ELF_ST_BIND ELF32_ST_BIND
23 #define ELF_ST_TYPE ELF32_ST_TYPE
24
25 #define Elf_Rel Elf32_Rel
26 #define Elf_Rela Elf32_Rela
27 #define ELF_R_SYM ELF32_R_SYM
28 #define ELF_R_TYPE ELF32_R_TYPE
29 #else
30
31 #define Elf_Ehdr Elf64_Ehdr
32 #define Elf_Shdr Elf64_Shdr
33 #define Elf_Sym Elf64_Sym
34 #define Elf_Addr Elf64_Addr
35 #define Elf_Sword Elf64_Sxword
36 #define Elf_Section Elf64_Half
37 #define ELF_ST_BIND ELF64_ST_BIND
38 #define ELF_ST_TYPE ELF64_ST_TYPE
39
40 #define Elf_Rel Elf64_Rel
41 #define Elf_Rela Elf64_Rela
42 #define ELF_R_SYM ELF64_R_SYM
43 #define ELF_R_TYPE ELF64_R_TYPE
44 #endif
45
46 /* The 64-bit MIPS ELF ABI uses an unusual reloc format. */
47 typedef struct
48 {
49 Elf32_Word r_sym; /* Symbol index */
50 unsigned char r_ssym; /* Special symbol for 2nd relocation */
51 unsigned char r_type3; /* 3rd relocation type */
52 unsigned char r_type2; /* 2nd relocation type */
53 unsigned char r_type1; /* 1st relocation type */
54 } _Elf64_Mips_R_Info;
55
56 typedef union
57 {
58 Elf64_Xword r_info_number;
59 _Elf64_Mips_R_Info r_info_fields;
60 } _Elf64_Mips_R_Info_union;
61
62 #define ELF64_MIPS_R_SYM(i) \
63 ((__extension__ (_Elf64_Mips_R_Info_union)(i)).r_info_fields.r_sym)
64
65 #define ELF64_MIPS_R_TYPE(i) \
66 ((__extension__ (_Elf64_Mips_R_Info_union)(i)).r_info_fields.r_type1)
67
68 #if KERNEL_ELFDATA != HOST_ELFDATA
69
__endian(const void * src,void * dest,unsigned int size)70 static inline void __endian(const void *src, void *dest, unsigned int size)
71 {
72 unsigned int i;
73 for (i = 0; i < size; i++)
74 ((unsigned char*)dest)[i] = ((unsigned char*)src)[size - i-1];
75 }
76
77 #define TO_NATIVE(x) \
78 ({ \
79 typeof(x) __x; \
80 __endian(&(x), &(__x), sizeof(__x)); \
81 __x; \
82 })
83
84 #else /* endianness matches */
85
86 #define TO_NATIVE(x) (x)
87
88 #endif
89
90 #define NOFAIL(ptr) do_nofail((ptr), #ptr)
91 void *do_nofail(void *ptr, const char *expr);
92
93 struct buffer {
94 char *p;
95 int pos;
96 int size;
97 };
98
99 void __attribute__((format(printf, 2, 3)))
100 buf_printf(struct buffer *buf, const char *fmt, ...);
101
102 void
103 buf_write(struct buffer *buf, const char *s, int len);
104
105 struct module {
106 struct module *next;
107 const char *name;
108 int gpl_compatible;
109 struct symbol *unres;
110 int seen;
111 int skip;
112 int has_init;
113 int has_cleanup;
114 struct buffer dev_table_buf;
115 char srcversion[25];
116 };
117
118 struct elf_info {
119 unsigned long size;
120 Elf_Ehdr *hdr;
121 Elf_Shdr *sechdrs;
122 Elf_Sym *symtab_start;
123 Elf_Sym *symtab_stop;
124 Elf_Section export_sec;
125 Elf_Section export_unused_sec;
126 Elf_Section export_gpl_sec;
127 Elf_Section export_unused_gpl_sec;
128 Elf_Section export_gpl_future_sec;
129 const char *strtab;
130 char *modinfo;
131 unsigned int modinfo_len;
132
133 /* support for 32bit section numbers */
134
135 unsigned int num_sections; /* max_secindex + 1 */
136 unsigned int secindex_strings;
137 /* if Nth symbol table entry has .st_shndx = SHN_XINDEX,
138 * take shndx from symtab_shndx_start[N] instead */
139 Elf32_Word *symtab_shndx_start;
140 Elf32_Word *symtab_shndx_stop;
141 };
142
is_shndx_special(unsigned int i)143 static inline int is_shndx_special(unsigned int i)
144 {
145 return i != SHN_XINDEX && i >= SHN_LORESERVE && i <= SHN_HIRESERVE;
146 }
147
148 /* shndx is in [0..SHN_LORESERVE) U (SHN_HIRESERVE, 0xfffffff], thus:
149 * shndx == 0 <=> sechdrs[0]
150 * ......
151 * shndx == SHN_LORESERVE-1 <=> sechdrs[SHN_LORESERVE-1]
152 * shndx == SHN_HIRESERVE+1 <=> sechdrs[SHN_LORESERVE]
153 * shndx == SHN_HIRESERVE+2 <=> sechdrs[SHN_LORESERVE+1]
154 * ......
155 * fyi: sym->st_shndx is uint16, SHN_LORESERVE = ff00, SHN_HIRESERVE = ffff,
156 * so basically we map 0000..feff -> 0000..feff
157 * ff00..ffff -> (you are a bad boy, dont do it)
158 * 10000..xxxx -> ff00..(xxxx-0x100)
159 */
shndx2secindex(unsigned int i)160 static inline unsigned int shndx2secindex(unsigned int i)
161 {
162 if (i <= SHN_HIRESERVE)
163 return i;
164 return i - (SHN_HIRESERVE + 1 - SHN_LORESERVE);
165 }
166
167 /* Accessor for sym->st_shndx, hides ugliness of "64k sections" */
get_secindex(const struct elf_info * info,const Elf_Sym * sym)168 static inline unsigned int get_secindex(const struct elf_info *info,
169 const Elf_Sym *sym)
170 {
171 if (sym->st_shndx != SHN_XINDEX)
172 return sym->st_shndx;
173 return shndx2secindex(info->symtab_shndx_start[sym -
174 info->symtab_start]);
175 }
176
177 /* file2alias.c */
178 extern unsigned int cross_build;
179 void handle_moddevtable(struct module *mod, struct elf_info *info,
180 Elf_Sym *sym, const char *symname);
181 void add_moddevtable(struct buffer *buf, struct module *mod);
182
183 /* sumversion.c */
184 void maybe_frob_rcs_version(const char *modfilename,
185 char *version,
186 void *modinfo,
187 unsigned long modinfo_offset);
188 void get_src_version(const char *modname, char sum[], unsigned sumlen);
189
190 /* from modpost.c */
191 void *grab_file(const char *filename, unsigned long *size);
192 char* get_next_line(unsigned long *pos, void *file, unsigned long size);
193 void release_file(void *file, unsigned long size);
194
195 void fatal(const char *fmt, ...);
196 void warn(const char *fmt, ...);
197 void merror(const char *fmt, ...);
198