projects/linux·blob v5.13 · refs

225 lines · 5.8 KiB

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)