projects/linux·blob v4.10 · refs

193 lines · 4.8 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/* On BSD-alike OSes elf.h defines these according to host's word size */
15#undef ELF_ST_BIND
16#undef ELF_ST_TYPE
17#undef ELF_R_SYM
18#undef ELF_R_TYPE
19
20#if KERNEL_ELFCLASS == ELFCLASS32
21
22#define Elf_Ehdr Elf32_Ehdr
23#define Elf_Shdr Elf32_Shdr
24#define Elf_Sym Elf32_Sym
25#define Elf_Addr Elf32_Addr
26#define Elf_Sword Elf64_Sword
27#define Elf_Section Elf32_Half
28#define ELF_ST_BIND ELF32_ST_BIND
29#define ELF_ST_TYPE ELF32_ST_TYPE
30
31#define Elf_Rel Elf32_Rel
32#define Elf_Rela Elf32_Rela
33#define ELF_R_SYM ELF32_R_SYM
34#define ELF_R_TYPE ELF32_R_TYPE
35#else
36
37#define Elf_Ehdr Elf64_Ehdr
38#define Elf_Shdr Elf64_Shdr
39#define Elf_Sym Elf64_Sym
40#define Elf_Addr Elf64_Addr
41#define Elf_Sword Elf64_Sxword
42#define Elf_Section Elf64_Half
43#define ELF_ST_BIND ELF64_ST_BIND
44#define ELF_ST_TYPE ELF64_ST_TYPE
45
46#define Elf_Rel Elf64_Rel
47#define Elf_Rela Elf64_Rela
48#define ELF_R_SYM ELF64_R_SYM
49#define ELF_R_TYPE ELF64_R_TYPE
50#endif
51
52/* The 64-bit MIPS ELF ABI uses an unusual reloc format. */
53typedef struct
54{
55 Elf32_Word r_sym; /* Symbol index */
56 unsigned char r_ssym; /* Special symbol for 2nd relocation */
57 unsigned char r_type3; /* 3rd relocation type */
58 unsigned char r_type2; /* 2nd relocation type */
59 unsigned char r_type1; /* 1st relocation type */
60} _Elf64_Mips_R_Info;
61
62typedef union
63{
64 Elf64_Xword r_info_number;
65 _Elf64_Mips_R_Info r_info_fields;
66} _Elf64_Mips_R_Info_union;
67
68#define ELF64_MIPS_R_SYM(i) \
69 ((__extension__ (_Elf64_Mips_R_Info_union)(i)).r_info_fields.r_sym)
70
71#define ELF64_MIPS_R_TYPE(i) \
72 ((__extension__ (_Elf64_Mips_R_Info_union)(i)).r_info_fields.r_type1)
73
74#if KERNEL_ELFDATA != HOST_ELFDATA
75
76static inline void __endian(const void *src, void *dest, unsigned int size)
77{
78 unsigned int i;
79 for (i = 0; i < size; i++)
80 ((unsigned char*)dest)[i] = ((unsigned char*)src)[size - i-1];
81}
82
83#define TO_NATIVE(x) \
84({ \
85 typeof(x) __x; \
86 __endian(&(x), &(__x), sizeof(__x)); \
87 __x; \
88})
89
90#else /* endianness matches */
91
92#define TO_NATIVE(x) (x)
93
94#endif
95
96#define NOFAIL(ptr) do_nofail((ptr), #ptr)
97void *do_nofail(void *ptr, const char *expr);
98
99struct buffer {
100 char *p;
101 int pos;
102 int size;
103};
104
105void __attribute__((format(printf, 2, 3)))
106buf_printf(struct buffer *buf, const char *fmt, ...);
107
108void
109buf_write(struct buffer *buf, const char *s, int len);
110
111struct module {
112 struct module *next;
113 const char *name;
114 int gpl_compatible;
115 struct symbol *unres;
116 int seen;
117 int skip;
118 int has_init;
119 int has_cleanup;
120 struct buffer dev_table_buf;
121 char srcversion[25];
122 int is_dot_o;
123};
124
125struct elf_info {
126 unsigned long size;
127 Elf_Ehdr *hdr;
128 Elf_Shdr *sechdrs;
129 Elf_Sym *symtab_start;
130 Elf_Sym *symtab_stop;
131 Elf_Section export_sec;
132 Elf_Section export_unused_sec;
133 Elf_Section export_gpl_sec;
134 Elf_Section export_unused_gpl_sec;
135 Elf_Section export_gpl_future_sec;
136 char *strtab;
137 char *modinfo;
138 unsigned int modinfo_len;
139
140 /* support for 32bit section numbers */
141
142 unsigned int num_sections; /* max_secindex + 1 */
143 unsigned int secindex_strings;
144 /* if Nth symbol table entry has .st_shndx = SHN_XINDEX,
145 * take shndx from symtab_shndx_start[N] instead */
146 Elf32_Word *symtab_shndx_start;
147 Elf32_Word *symtab_shndx_stop;
148};
149
150static inline int is_shndx_special(unsigned int i)
151{
152 return i != SHN_XINDEX && i >= SHN_LORESERVE && i <= SHN_HIRESERVE;
153}
154
155/*
156 * Move reserved section indices SHN_LORESERVE..SHN_HIRESERVE out of
157 * the way to -256..-1, to avoid conflicting with real section
158 * indices.
159 */
160#define SPECIAL(i) ((i) - (SHN_HIRESERVE + 1))
161
162/* Accessor for sym->st_shndx, hides ugliness of "64k sections" */
163static inline unsigned int get_secindex(const struct elf_info *info,
164 const Elf_Sym *sym)
165{
166 if (is_shndx_special(sym->st_shndx))
167 return SPECIAL(sym->st_shndx);
168 if (sym->st_shndx != SHN_XINDEX)
169 return sym->st_shndx;
170 return info->symtab_shndx_start[sym - info->symtab_start];
171}
172
173/* file2alias.c */
174extern unsigned int cross_build;
175void handle_moddevtable(struct module *mod, struct elf_info *info,
176 Elf_Sym *sym, const char *symname);
177void add_moddevtable(struct buffer *buf, struct module *mod);
178
179/* sumversion.c */
180void maybe_frob_rcs_version(const char *modfilename,
181 char *version,
182 void *modinfo,
183 unsigned long modinfo_offset);
184void get_src_version(const char *modname, char sum[], unsigned sumlen);
185
186/* from modpost.c */
187void *grab_file(const char *filename, unsigned long *size);
188char* get_next_line(unsigned long *pos, void *file, unsigned long size);
189void release_file(void *file, unsigned long size);
190
191void fatal(const char *fmt, ...);
192void warn(const char *fmt, ...);
193void merror(const char *fmt, ...);