projects/linux·blob v5.5 · refs

203 lines · 5.1 KiB

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 // Missing namespace dependencies
130 struct namespace_list *missing_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 *strtab;
147 char *modinfo;
148 unsigned int modinfo_len;
149
150 /* support for 32bit section numbers */
151
152 unsigned int num_sections; /* max_secindex + 1 */
153 unsigned int secindex_strings;
154 /* if Nth symbol table entry has .st_shndx = SHN_XINDEX,
155 * take shndx from symtab_shndx_start[N] instead */
156 Elf32_Word *symtab_shndx_start;
157 Elf32_Word *symtab_shndx_stop;
158};
159
160static inline int is_shndx_special(unsigned int i)
161{
162 return i != SHN_XINDEX && i >= SHN_LORESERVE && i <= SHN_HIRESERVE;
163}
164
165/*
166 * Move reserved section indices SHN_LORESERVE..SHN_HIRESERVE out of
167 * the way to -256..-1, to avoid conflicting with real section
168 * indices.
169 */
170#define SPECIAL(i) ((i) - (SHN_HIRESERVE + 1))
171
172/* Accessor for sym->st_shndx, hides ugliness of "64k sections" */
173static inline unsigned int get_secindex(const struct elf_info *info,
174 const Elf_Sym *sym)
175{
176 if (is_shndx_special(sym->st_shndx))
177 return SPECIAL(sym->st_shndx);
178 if (sym->st_shndx != SHN_XINDEX)
179 return sym->st_shndx;
180 return info->symtab_shndx_start[sym - info->symtab_start];
181}
182
183/* file2alias.c */
184extern unsigned int cross_build;
185void handle_moddevtable(struct module *mod, struct elf_info *info,
186 Elf_Sym *sym, const char *symname);
187void add_moddevtable(struct buffer *buf, struct module *mod);
188
189/* sumversion.c */
190void maybe_frob_rcs_version(const char *modfilename,
191 char *version,
192 void *modinfo,
193 unsigned long modinfo_offset);
194void get_src_version(const char *modname, char sum[], unsigned sumlen);
195
196/* from modpost.c */
197void *grab_file(const char *filename, unsigned long *size);
198char* get_next_line(unsigned long *pos, void *file, unsigned long size);
199void release_file(void *file, unsigned long size);
200
201void fatal(const char *fmt, ...);
202void warn(const char *fmt, ...);
203void merror(const char *fmt, ...);