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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 #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 	int is_dot_o;
117 };
118 
119 struct elf_info {
120 	unsigned long size;
121 	Elf_Ehdr     *hdr;
122 	Elf_Shdr     *sechdrs;
123 	Elf_Sym      *symtab_start;
124 	Elf_Sym      *symtab_stop;
125 	Elf_Section  export_sec;
126 	Elf_Section  export_unused_sec;
127 	Elf_Section  export_gpl_sec;
128 	Elf_Section  export_unused_gpl_sec;
129 	Elf_Section  export_gpl_future_sec;
130 	const char   *strtab;
131 	char	     *modinfo;
132 	unsigned int modinfo_len;
133 
134 	/* support for 32bit section numbers */
135 
136 	unsigned int num_sections; /* max_secindex + 1 */
137 	unsigned int secindex_strings;
138 	/* if Nth symbol table entry has .st_shndx = SHN_XINDEX,
139 	 * take shndx from symtab_shndx_start[N] instead */
140 	Elf32_Word   *symtab_shndx_start;
141 	Elf32_Word   *symtab_shndx_stop;
142 };
143 
is_shndx_special(unsigned int i)144 static inline int is_shndx_special(unsigned int i)
145 {
146 	return i != SHN_XINDEX && i >= SHN_LORESERVE && i <= SHN_HIRESERVE;
147 }
148 
149 /*
150  * Move reserved section indices SHN_LORESERVE..SHN_HIRESERVE out of
151  * the way to -256..-1, to avoid conflicting with real section
152  * indices.
153  */
154 #define SPECIAL(i) ((i) - (SHN_HIRESERVE + 1))
155 
156 /* Accessor for sym->st_shndx, hides ugliness of "64k sections" */
get_secindex(const struct elf_info * info,const Elf_Sym * sym)157 static inline unsigned int get_secindex(const struct elf_info *info,
158 					const Elf_Sym *sym)
159 {
160 	if (is_shndx_special(sym->st_shndx))
161 		return SPECIAL(sym->st_shndx);
162 	if (sym->st_shndx != SHN_XINDEX)
163 		return sym->st_shndx;
164 	return info->symtab_shndx_start[sym - info->symtab_start];
165 }
166 
167 /* file2alias.c */
168 extern unsigned int cross_build;
169 void handle_moddevtable(struct module *mod, struct elf_info *info,
170 			Elf_Sym *sym, const char *symname);
171 void add_moddevtable(struct buffer *buf, struct module *mod);
172 
173 /* sumversion.c */
174 void maybe_frob_rcs_version(const char *modfilename,
175 			    char *version,
176 			    void *modinfo,
177 			    unsigned long modinfo_offset);
178 void get_src_version(const char *modname, char sum[], unsigned sumlen);
179 
180 /* from modpost.c */
181 void *grab_file(const char *filename, unsigned long *size);
182 char* get_next_line(unsigned long *pos, void *file, unsigned long size);
183 void release_file(void *file, unsigned long size);
184 
185 void fatal(const char *fmt, ...);
186 void warn(const char *fmt, ...);
187 void merror(const char *fmt, ...);
188