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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/* SPDX-License-Identifier: GPL-2.0 */
2#include <stdio.h>
3#include <stdlib.h>
4#include <stdarg.h>
5#include <stdbool.h>
6#include <string.h>
7#include <sys/types.h>
8#include <sys/stat.h>
9#include <sys/mman.h>
10#include <fcntl.h>
11#include <unistd.h>
12#include <elf.h>
13
14#include "elfconfig.h"
15
16/* On BSD-alike OSes elf.h defines these according to host's word size */
17#undef ELF_ST_BIND
18#undef ELF_ST_TYPE
19#undef ELF_R_SYM
20#undef ELF_R_TYPE
21
22#if KERNEL_ELFCLASS == ELFCLASS32
23
24#define Elf_Ehdr Elf32_Ehdr
25#define Elf_Shdr Elf32_Shdr
26#define Elf_Sym Elf32_Sym
27#define Elf_Addr Elf32_Addr
28#define Elf_Sword Elf64_Sword
29#define Elf_Section Elf32_Half
30#define ELF_ST_BIND ELF32_ST_BIND
31#define ELF_ST_TYPE ELF32_ST_TYPE
32
33#define Elf_Rel Elf32_Rel
34#define Elf_Rela Elf32_Rela
35#define ELF_R_SYM ELF32_R_SYM
36#define ELF_R_TYPE ELF32_R_TYPE
37#else
38
39#define Elf_Ehdr Elf64_Ehdr
40#define Elf_Shdr Elf64_Shdr
41#define Elf_Sym Elf64_Sym
42#define Elf_Addr Elf64_Addr
43#define Elf_Sword Elf64_Sxword
44#define Elf_Section Elf64_Half
45#define ELF_ST_BIND ELF64_ST_BIND
46#define ELF_ST_TYPE ELF64_ST_TYPE
47
48#define Elf_Rel Elf64_Rel
49#define Elf_Rela Elf64_Rela
50#define ELF_R_SYM ELF64_R_SYM
51#define ELF_R_TYPE ELF64_R_TYPE
52#endif
53
54/* The 64-bit MIPS ELF ABI uses an unusual reloc format. */
55typedef struct
56{
57 Elf32_Word r_sym; /* Symbol index */
58 unsigned char r_ssym; /* Special symbol for 2nd relocation */
59 unsigned char r_type3; /* 3rd relocation type */
60 unsigned char r_type2; /* 2nd relocation type */
61 unsigned char r_type1; /* 1st relocation type */
62} _Elf64_Mips_R_Info;
63
64typedef union
65{
66 Elf64_Xword r_info_number;
67 _Elf64_Mips_R_Info r_info_fields;
68} _Elf64_Mips_R_Info_union;
69
70#define ELF64_MIPS_R_SYM(i) \
71 ((__extension__ (_Elf64_Mips_R_Info_union)(i)).r_info_fields.r_sym)
72
73#define ELF64_MIPS_R_TYPE(i) \
74 ((__extension__ (_Elf64_Mips_R_Info_union)(i)).r_info_fields.r_type1)
75
76#if KERNEL_ELFDATA != HOST_ELFDATA
77
78static inline void __endian(const void *src, void *dest, unsigned int size)
79{
80 unsigned int i;
81 for (i = 0; i < size; i++)
82 ((unsigned char*)dest)[i] = ((unsigned char*)src)[size - i-1];
83}
84
85#define TO_NATIVE(x) \
86({ \
87 typeof(x) __x; \
88 __endian(&(x), &(__x), sizeof(__x)); \
89 __x; \
90})
91
92#else /* endianness matches */
93
94#define TO_NATIVE(x) (x)
95
96#endif
97
98#define NOFAIL(ptr) do_nofail((ptr), #ptr)
99void *do_nofail(void *ptr, const char *expr);
100
101struct buffer {
102 char *p;
103 int pos;
104 int size;
105};
106
107void __attribute__((format(printf, 2, 3)))
108buf_printf(struct buffer *buf, const char *fmt, ...);
109
110void
111buf_write(struct buffer *buf, const char *s, int len);
112
113struct namespace_list {
114 struct namespace_list *next;
115 char namespace[];
116};
117
118struct module {
119 struct module *next;
120 int gpl_compatible;
121 struct symbol *unres;
122 int from_dump; /* 1 if module was loaded from *.symvers */
123 int is_vmlinux;
124 int seen;
125 int has_init;
126 int has_cleanup;
127 struct buffer dev_table_buf;
128 char srcversion[25];
129 // Missing namespace dependencies
130 struct namespace_list *missing_namespaces;
131 // Actual imported namespaces
132 struct namespace_list *imported_namespaces;
133 char name[];
134};
135
136struct elf_info {
137 size_t size;
138 Elf_Ehdr *hdr;
139 Elf_Shdr *sechdrs;
140 Elf_Sym *symtab_start;
141 Elf_Sym *symtab_stop;
142 Elf_Section export_sec;
143 Elf_Section export_gpl_sec;
144 char *strtab;
145 char *modinfo;
146 unsigned int modinfo_len;
147
148 /* support for 32bit section numbers */
149
150 unsigned int num_sections; /* max_secindex + 1 */
151 unsigned int secindex_strings;
152 /* if Nth symbol table entry has .st_shndx = SHN_XINDEX,
153 * take shndx from symtab_shndx_start[N] instead */
154 Elf32_Word *symtab_shndx_start;
155 Elf32_Word *symtab_shndx_stop;
156};
157
158static inline int is_shndx_special(unsigned int i)
159{
160 return i != SHN_XINDEX && i >= SHN_LORESERVE && i <= SHN_HIRESERVE;
161}
162
163/*
164 * Move reserved section indices SHN_LORESERVE..SHN_HIRESERVE out of
165 * the way to -256..-1, to avoid conflicting with real section
166 * indices.
167 */
168#define SPECIAL(i) ((i) - (SHN_HIRESERVE + 1))
169
170/* Accessor for sym->st_shndx, hides ugliness of "64k sections" */
171static inline unsigned int get_secindex(const struct elf_info *info,
172 const Elf_Sym *sym)
173{
174 if (is_shndx_special(sym->st_shndx))
175 return SPECIAL(sym->st_shndx);
176 if (sym->st_shndx != SHN_XINDEX)
177 return sym->st_shndx;
178 return info->symtab_shndx_start[sym - info->symtab_start];
179}
180
181static inline bool strends(const char *str, const char *postfix)
182{
183 if (strlen(str) < strlen(postfix))
184 return false;
185
186 return strcmp(str + strlen(str) - strlen(postfix), postfix) == 0;
187}
188
189/* file2alias.c */
190extern unsigned int cross_build;
191void handle_moddevtable(struct module *mod, struct elf_info *info,
192 Elf_Sym *sym, const char *symname);
193void add_moddevtable(struct buffer *buf, struct module *mod);
194
195/* sumversion.c */
196void get_src_version(const char *modname, char sum[], unsigned sumlen);
197
198/* from modpost.c */
199char *read_text_file(const char *filename);
200char *get_line(char **stringp);
201
202enum loglevel {
203 LOG_WARN,
204 LOG_ERROR,
205 LOG_FATAL
206};
207
208void modpost_log(enum loglevel loglevel, const char *fmt, ...);
209
210/*
211 * warn - show the given message, then let modpost continue running, still
212 * allowing modpost to exit successfully. This should be used when
213 * we still allow to generate vmlinux and modules.
214 *
215 * error - show the given message, then let modpost continue running, but fail
216 * in the end. This should be used when we should stop building vmlinux
217 * or modules, but we can continue running modpost to catch as many
218 * issues as possible.
219 *
220 * fatal - show the given message, and bail out immediately. This should be
221 * used when there is no point to continue running modpost.
222 */
223#define warn(fmt, args...) modpost_log(LOG_WARN, fmt, ##args)
224#define error(fmt, args...) modpost_log(LOG_ERROR, fmt, ##args)
225#define fatal(fmt, args...) modpost_log(LOG_FATAL, fmt, ##args)