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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. */
53 typedef 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 
62 typedef 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 
__endian(const void * src,void * dest,unsigned int size)76 static 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)
97 void *do_nofail(void *ptr, const char *expr);
98 
99 struct buffer {
100 	char *p;
101 	int pos;
102 	int size;
103 };
104 
105 void __attribute__((format(printf, 2, 3)))
106 buf_printf(struct buffer *buf, const char *fmt, ...);
107 
108 void
109 buf_write(struct buffer *buf, const char *s, int len);
110 
111 struct 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 
125 struct 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 
is_shndx_special(unsigned int i)150 static 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" */
get_secindex(const struct elf_info * info,const Elf_Sym * sym)163 static 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 */
174 extern unsigned int cross_build;
175 void handle_moddevtable(struct module *mod, struct elf_info *info,
176 			Elf_Sym *sym, const char *symname);
177 void add_moddevtable(struct buffer *buf, struct module *mod);
178 
179 /* sumversion.c */
180 void maybe_frob_rcs_version(const char *modfilename,
181 			    char *version,
182 			    void *modinfo,
183 			    unsigned long modinfo_offset);
184 void get_src_version(const char *modname, char sum[], unsigned sumlen);
185 
186 /* from modpost.c */
187 void *grab_file(const char *filename, unsigned long *size);
188 char* get_next_line(unsigned long *pos, void *file, unsigned long size);
189 void release_file(void *file, unsigned long size);
190 
191 void fatal(const char *fmt, ...);
192 void warn(const char *fmt, ...);
193 void merror(const char *fmt, ...);
194