projects/linux·blob v2.6.36 · refs

197 lines · 5.1 KiB

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. */
47typedef 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
56typedef 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
70static 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)
91void *do_nofail(void *ptr, const char *expr);
92
93struct buffer {
94 char *p;
95 int pos;
96 int size;
97};
98
99void __attribute__((format(printf, 2, 3)))
100buf_printf(struct buffer *buf, const char *fmt, ...);
101
102void
103buf_write(struct buffer *buf, const char *s, int len);
104
105struct 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
118struct 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
143static 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 */
160static 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" */
168static 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 */
178extern unsigned int cross_build;
179void handle_moddevtable(struct module *mod, struct elf_info *info,
180 Elf_Sym *sym, const char *symname);
181void add_moddevtable(struct buffer *buf, struct module *mod);
182
183/* sumversion.c */
184void maybe_frob_rcs_version(const char *modfilename,
185 char *version,
186 void *modinfo,
187 unsigned long modinfo_offset);
188void get_src_version(const char *modname, char sum[], unsigned sumlen);
189
190/* from modpost.c */
191void *grab_file(const char *filename, unsigned long *size);
192char* get_next_line(unsigned long *pos, void *file, unsigned long size);
193void release_file(void *file, unsigned long size);
194
195void fatal(const char *fmt, ...);
196void warn(const char *fmt, ...);
197void merror(const char *fmt, ...);