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1/* SPDX-License-Identifier: GPL-2.0 */
2#include <stdio.h>
3#include <stdlib.h>
4#include <stdarg.h>
5#include <string.h>
6#include <sys/types.h>
7#include <sys/stat.h>
8#include <sys/mman.h>
9#include <fcntl.h>
10#include <unistd.h>
11#include <elf.h>
12
13#include "elfconfig.h"
14
15/* On BSD-alike OSes elf.h defines these according to host's word size */
16#undef ELF_ST_BIND
17#undef ELF_ST_TYPE
18#undef ELF_R_SYM
19#undef ELF_R_TYPE
20
21#if KERNEL_ELFCLASS == ELFCLASS32
22
23#define Elf_Ehdr Elf32_Ehdr
24#define Elf_Shdr Elf32_Shdr
25#define Elf_Sym Elf32_Sym
26#define Elf_Addr Elf32_Addr
27#define Elf_Sword Elf64_Sword
28#define Elf_Section Elf32_Half
29#define ELF_ST_BIND ELF32_ST_BIND
30#define ELF_ST_TYPE ELF32_ST_TYPE
31
32#define Elf_Rel Elf32_Rel
33#define Elf_Rela Elf32_Rela
34#define ELF_R_SYM ELF32_R_SYM
35#define ELF_R_TYPE ELF32_R_TYPE
36#else
37
38#define Elf_Ehdr Elf64_Ehdr
39#define Elf_Shdr Elf64_Shdr
40#define Elf_Sym Elf64_Sym
41#define Elf_Addr Elf64_Addr
42#define Elf_Sword Elf64_Sxword
43#define Elf_Section Elf64_Half
44#define ELF_ST_BIND ELF64_ST_BIND
45#define ELF_ST_TYPE ELF64_ST_TYPE
46
47#define Elf_Rel Elf64_Rel
48#define Elf_Rela Elf64_Rela
49#define ELF_R_SYM ELF64_R_SYM
50#define ELF_R_TYPE ELF64_R_TYPE
51#endif
52
53/* The 64-bit MIPS ELF ABI uses an unusual reloc format. */
54typedef struct
55{
56 Elf32_Word r_sym; /* Symbol index */
57 unsigned char r_ssym; /* Special symbol for 2nd relocation */
58 unsigned char r_type3; /* 3rd relocation type */
59 unsigned char r_type2; /* 2nd relocation type */
60 unsigned char r_type1; /* 1st relocation type */
61} _Elf64_Mips_R_Info;
62
63typedef union
64{
65 Elf64_Xword r_info_number;
66 _Elf64_Mips_R_Info r_info_fields;
67} _Elf64_Mips_R_Info_union;
68
69#define ELF64_MIPS_R_SYM(i) \
70 ((__extension__ (_Elf64_Mips_R_Info_union)(i)).r_info_fields.r_sym)
71
72#define ELF64_MIPS_R_TYPE(i) \
73 ((__extension__ (_Elf64_Mips_R_Info_union)(i)).r_info_fields.r_type1)
74
75#if KERNEL_ELFDATA != HOST_ELFDATA
76
77static inline void __endian(const void *src, void *dest, unsigned int size)
78{
79 unsigned int i;
80 for (i = 0; i < size; i++)
81 ((unsigned char*)dest)[i] = ((unsigned char*)src)[size - i-1];
82}
83
84#define TO_NATIVE(x) \
85({ \
86 typeof(x) __x; \
87 __endian(&(x), &(__x), sizeof(__x)); \
88 __x; \
89})
90
91#else /* endianness matches */
92
93#define TO_NATIVE(x) (x)
94
95#endif
96
97#define NOFAIL(ptr) do_nofail((ptr), #ptr)
98void *do_nofail(void *ptr, const char *expr);
99
100struct buffer {
101 char *p;
102 int pos;
103 int size;
104};
105
106void __attribute__((format(printf, 2, 3)))
107buf_printf(struct buffer *buf, const char *fmt, ...);
108
109void
110buf_write(struct buffer *buf, const char *s, int len);
111
112struct namespace_list {
113 struct namespace_list *next;
114 char namespace[0];
115};
116
117struct module {
118 struct module *next;
119 const char *name;
120 int gpl_compatible;
121 struct symbol *unres;
122 int seen;
123 int skip;
124 int has_init;
125 int has_cleanup;
126 struct buffer dev_table_buf;
127 char srcversion[25];
128 int is_dot_o;
129 // Required namespace dependencies
130 struct namespace_list *required_namespaces;
131 // Actual imported namespaces
132 struct namespace_list *imported_namespaces;
133};
134
135struct elf_info {
136 unsigned long size;
137 Elf_Ehdr *hdr;
138 Elf_Shdr *sechdrs;
139 Elf_Sym *symtab_start;
140 Elf_Sym *symtab_stop;
141 Elf_Section export_sec;
142 Elf_Section export_unused_sec;
143 Elf_Section export_gpl_sec;
144 Elf_Section export_unused_gpl_sec;
145 Elf_Section export_gpl_future_sec;
146 char *ksymtab_strings;
147 char *strtab;
148 char *modinfo;
149 unsigned int modinfo_len;
150
151 /* support for 32bit section numbers */
152
153 unsigned int num_sections; /* max_secindex + 1 */
154 unsigned int secindex_strings;
155 /* if Nth symbol table entry has .st_shndx = SHN_XINDEX,
156 * take shndx from symtab_shndx_start[N] instead */
157 Elf32_Word *symtab_shndx_start;
158 Elf32_Word *symtab_shndx_stop;
159};
160
161static inline int is_shndx_special(unsigned int i)
162{
163 return i != SHN_XINDEX && i >= SHN_LORESERVE && i <= SHN_HIRESERVE;
164}
165
166/*
167 * Move reserved section indices SHN_LORESERVE..SHN_HIRESERVE out of
168 * the way to -256..-1, to avoid conflicting with real section
169 * indices.
170 */
171#define SPECIAL(i) ((i) - (SHN_HIRESERVE + 1))
172
173/* Accessor for sym->st_shndx, hides ugliness of "64k sections" */
174static inline unsigned int get_secindex(const struct elf_info *info,
175 const Elf_Sym *sym)
176{
177 if (is_shndx_special(sym->st_shndx))
178 return SPECIAL(sym->st_shndx);
179 if (sym->st_shndx != SHN_XINDEX)
180 return sym->st_shndx;
181 return info->symtab_shndx_start[sym - info->symtab_start];
182}
183
184/* file2alias.c */
185extern unsigned int cross_build;
186void handle_moddevtable(struct module *mod, struct elf_info *info,
187 Elf_Sym *sym, const char *symname);
188void add_moddevtable(struct buffer *buf, struct module *mod);
189
190/* sumversion.c */
191void maybe_frob_rcs_version(const char *modfilename,
192 char *version,
193 void *modinfo,
194 unsigned long modinfo_offset);
195void get_src_version(const char *modname, char sum[], unsigned sumlen);
196
197/* from modpost.c */
198void *grab_file(const char *filename, unsigned long *size);
199char* get_next_line(unsigned long *pos, void *file, unsigned long size);
200void release_file(void *file, unsigned long size);
201
202void fatal(const char *fmt, ...);
203void warn(const char *fmt, ...);
204void merror(const char *fmt, ...);
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/*
149 * Move reserved section indices SHN_LORESERVE..SHN_HIRESERVE out of
150 * the way to -256..-1, to avoid conflicting with real section
151 * indices.
152 */
153#define SPECIAL(i) ((i) - (SHN_HIRESERVE + 1))
154
155/* Accessor for sym->st_shndx, hides ugliness of "64k sections" */
156static inline unsigned int get_secindex(const struct elf_info *info,
157 const Elf_Sym *sym)
158{
159 if (is_shndx_special(sym->st_shndx))
160 return SPECIAL(sym->st_shndx);
161 if (sym->st_shndx != SHN_XINDEX)
162 return sym->st_shndx;
163 return info->symtab_shndx_start[sym - info->symtab_start];
164}
165
166/* file2alias.c */
167extern unsigned int cross_build;
168void handle_moddevtable(struct module *mod, struct elf_info *info,
169 Elf_Sym *sym, const char *symname);
170void add_moddevtable(struct buffer *buf, struct module *mod);
171
172/* sumversion.c */
173void maybe_frob_rcs_version(const char *modfilename,
174 char *version,
175 void *modinfo,
176 unsigned long modinfo_offset);
177void get_src_version(const char *modname, char sum[], unsigned sumlen);
178
179/* from modpost.c */
180void *grab_file(const char *filename, unsigned long *size);
181char* get_next_line(unsigned long *pos, void *file, unsigned long size);
182void release_file(void *file, unsigned long size);
183
184void fatal(const char *fmt, ...);
185void warn(const char *fmt, ...);
186void merror(const char *fmt, ...);