summaryrefslogtreecommitdiff
path: root/scripts/mod/modpost.h
blob: 1178f40a73f3d494fceb250ba773294a5a3ea17d (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
/* SPDX-License-Identifier: GPL-2.0 */
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/mman.h>
#include <fcntl.h>
#include <unistd.h>
#include <elf.h>

#include "list.h"
#include "elfconfig.h"

/* On BSD-alike OSes elf.h defines these according to host's word size */
#undef ELF_ST_BIND
#undef ELF_ST_TYPE
#undef ELF_R_SYM
#undef ELF_R_TYPE

#if KERNEL_ELFCLASS == ELFCLASS32

#define Elf_Ehdr    Elf32_Ehdr
#define Elf_Shdr    Elf32_Shdr
#define Elf_Sym     Elf32_Sym
#define Elf_Addr    Elf32_Addr
#define Elf_Section Elf32_Half
#define ELF_ST_BIND ELF32_ST_BIND
#define ELF_ST_TYPE ELF32_ST_TYPE

#define Elf_Rel     Elf32_Rel
#define Elf_Rela    Elf32_Rela
#define ELF_R_SYM   ELF32_R_SYM
#define ELF_R_TYPE  ELF32_R_TYPE
#else

#define Elf_Ehdr    Elf64_Ehdr
#define Elf_Shdr    Elf64_Shdr
#define Elf_Sym     Elf64_Sym
#define Elf_Addr    Elf64_Addr
#define Elf_Section Elf64_Half
#define ELF_ST_BIND ELF64_ST_BIND
#define ELF_ST_TYPE ELF64_ST_TYPE

#define Elf_Rel     Elf64_Rel
#define Elf_Rela    Elf64_Rela
#define ELF_R_SYM   ELF64_R_SYM
#define ELF_R_TYPE  ELF64_R_TYPE
#endif

/* The 64-bit MIPS ELF ABI uses an unusual reloc format. */
typedef struct
{
	Elf32_Word    r_sym;	/* Symbol index */
	unsigned char r_ssym;	/* Special symbol for 2nd relocation */
	unsigned char r_type3;	/* 3rd relocation type */
	unsigned char r_type2;	/* 2nd relocation type */
	unsigned char r_type1;	/* 1st relocation type */
} _Elf64_Mips_R_Info;

typedef union
{
	Elf64_Xword		r_info_number;
	_Elf64_Mips_R_Info	r_info_fields;
} _Elf64_Mips_R_Info_union;

#define ELF64_MIPS_R_SYM(i) \
  ((__extension__ (_Elf64_Mips_R_Info_union)(i)).r_info_fields.r_sym)

#define ELF64_MIPS_R_TYPE(i) \
  ((__extension__ (_Elf64_Mips_R_Info_union)(i)).r_info_fields.r_type1)

#if KERNEL_ELFDATA != HOST_ELFDATA

static inline void __endian(const void *src, void *dest, unsigned int size)
{
	unsigned int i;
	for (i = 0; i < size; i++)
		((unsigned char*)dest)[i] = ((unsigned char*)src)[size - i-1];
}

#define TO_NATIVE(x)						\
({								\
	typeof(x) __x;						\
	__endian(&(x), &(__x), sizeof(__x));			\
	__x;							\
})

#else /* endianness matches */

#define TO_NATIVE(x) (x)

#endif

#define NOFAIL(ptr)   do_nofail((ptr), #ptr)

#define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]))

void *do_nofail(void *ptr, const char *expr);

struct buffer {
	char *p;
	int pos;
	int size;
};

void __attribute__((format(printf, 2, 3)))
buf_printf(struct buffer *buf, const char *fmt, ...);

void
buf_write(struct buffer *buf, const char *s, int len);

struct module {
	struct list_head list;
	struct list_head exported_symbols;
	struct list_head unresolved_symbols;
	bool is_gpl_compatible;
	bool from_dump;		/* true if module was loaded from *.symvers */
	bool is_vmlinux;
	bool seen;
	bool has_init;
	bool has_cleanup;
	struct buffer dev_table_buf;
	char	     srcversion[25];
	// Missing namespace dependencies
	struct list_head missing_namespaces;
	// Actual imported namespaces
	struct list_head imported_namespaces;
	char name[];
};

struct elf_info {
	size_t size;
	Elf_Ehdr     *hdr;
	Elf_Shdr     *sechdrs;
	Elf_Sym      *symtab_start;
	Elf_Sym      *symtab_stop;
	char         *strtab;
	char	     *modinfo;
	unsigned int modinfo_len;

	/* support for 32bit section numbers */

	unsigned int num_sections; /* max_secindex + 1 */
	unsigned int secindex_strings;
	/* if Nth symbol table entry has .st_shndx = SHN_XINDEX,
	 * take shndx from symtab_shndx_start[N] instead */
	Elf32_Word   *symtab_shndx_start;
	Elf32_Word   *symtab_shndx_stop;
};

static inline int is_shndx_special(unsigned int i)
{
	return i != SHN_XINDEX && i >= SHN_LORESERVE && i <= SHN_HIRESERVE;
}

/* Accessor for sym->st_shndx, hides ugliness of "64k sections" */
static inline unsigned int get_secindex(const struct elf_info *info,
					const Elf_Sym *sym)
{
	unsigned int index = sym->st_shndx;

	/*
	 * Elf{32,64}_Sym::st_shndx is 2 byte. Big section numbers are available
	 * in the .symtab_shndx section.
	 */
	if (index == SHN_XINDEX)
		return info->symtab_shndx_start[sym - info->symtab_start];

	/*
	 * Move reserved section indices SHN_LORESERVE..SHN_HIRESERVE out of
	 * the way to UINT_MAX-255..UINT_MAX, to avoid conflicting with real
	 * section indices.
	 */
	if (index >= SHN_LORESERVE && index <= SHN_HIRESERVE)
		return index - SHN_HIRESERVE - 1;

	return index;
}

/* file2alias.c */
void handle_moddevtable(struct module *mod, struct elf_info *info,
			Elf_Sym *sym, const char *symname);
void add_moddevtable(struct buffer *buf, struct module *mod);

/* sumversion.c */
void get_src_version(const char *modname, char sum[], unsigned sumlen);

/* from modpost.c */
char *read_text_file(const char *filename);
char *get_line(char **stringp);
void *sym_get_data(const struct elf_info *info, const Elf_Sym *sym);

enum loglevel {
	LOG_WARN,
	LOG_ERROR,
	LOG_FATAL
};

void modpost_log(enum loglevel loglevel, const char *fmt, ...);

/*
 * warn - show the given message, then let modpost continue running, still
 *        allowing modpost to exit successfully. This should be used when
 *        we still allow to generate vmlinux and modules.
 *
 * error - show the given message, then let modpost continue running, but fail
 *         in the end. This should be used when we should stop building vmlinux
 *         or modules, but we can continue running modpost to catch as many
 *         issues as possible.
 *
 * fatal - show the given message, and bail out immediately. This should be
 *         used when there is no point to continue running modpost.
 */
#define warn(fmt, args...)	modpost_log(LOG_WARN, fmt, ##args)
#define error(fmt, args...)	modpost_log(LOG_ERROR, fmt, ##args)
#define fatal(fmt, args...)	modpost_log(LOG_FATAL, fmt, ##args)