1 // SPDX-License-Identifier: GPL-2.0
2 #include <linux/types.h>
3 #include <linux/module.h>
4 
5 /* Some of this are builtin function (some are not but could in the future),
6  * so I *must* declare good prototypes for them and then EXPORT them.
7  * The kernel code uses the macro defined by include/linux/string.h,
8  * so I undef macros; the userspace code does not include that and I
9  * add an EXPORT for the glibc one.
10  */
11 
12 #undef strlen
13 #undef strstr
14 #undef memcpy
15 #undef memset
16 
17 extern size_t strlen(const char *);
18 extern void *memmove(void *, const void *, size_t);
19 extern void *memset(void *, int, size_t);
20 extern int printf(const char *, ...);
21 
22 /* If it's not defined, the export is included in lib/string.c.*/
23 #ifdef __HAVE_ARCH_STRSTR
24 EXPORT_SYMBOL(strstr);
25 #endif
26 
27 #ifndef __x86_64__
28 extern void *memcpy(void *, const void *, size_t);
29 EXPORT_SYMBOL(memcpy);
30 #endif
31 
32 EXPORT_SYMBOL(memmove);
33 EXPORT_SYMBOL(memset);
34 EXPORT_SYMBOL(printf);
35 
36 /* Here, instead, I can provide a fake prototype. Yes, someone cares: genksyms.
37  * However, the modules will use the CRC defined *here*, no matter if it is
38  * good; so the versions of these symbols will always match
39  */
40 #define EXPORT_SYMBOL_PROTO(sym)       \
41 	int sym(void);                  \
42 	EXPORT_SYMBOL(sym);
43 
44 extern void readdir64(void) __attribute__((weak));
45 EXPORT_SYMBOL(readdir64);
46 extern void truncate64(void) __attribute__((weak));
47 EXPORT_SYMBOL(truncate64);
48 
49 #ifdef CONFIG_ARCH_REUSE_HOST_VSYSCALL_AREA
50 EXPORT_SYMBOL(vsyscall_ehdr);
51 EXPORT_SYMBOL(vsyscall_end);
52 #endif
53 
54 EXPORT_SYMBOL_PROTO(__errno_location);
55 
56 EXPORT_SYMBOL_PROTO(access);
57 EXPORT_SYMBOL_PROTO(open);
58 EXPORT_SYMBOL_PROTO(open64);
59 EXPORT_SYMBOL_PROTO(close);
60 EXPORT_SYMBOL_PROTO(read);
61 EXPORT_SYMBOL_PROTO(write);
62 EXPORT_SYMBOL_PROTO(dup2);
63 EXPORT_SYMBOL_PROTO(__xstat);
64 EXPORT_SYMBOL_PROTO(__lxstat);
65 EXPORT_SYMBOL_PROTO(__lxstat64);
66 EXPORT_SYMBOL_PROTO(__fxstat64);
67 EXPORT_SYMBOL_PROTO(lseek);
68 EXPORT_SYMBOL_PROTO(lseek64);
69 EXPORT_SYMBOL_PROTO(chown);
70 EXPORT_SYMBOL_PROTO(fchown);
71 EXPORT_SYMBOL_PROTO(truncate);
72 EXPORT_SYMBOL_PROTO(ftruncate64);
73 EXPORT_SYMBOL_PROTO(utime);
74 EXPORT_SYMBOL_PROTO(utimes);
75 EXPORT_SYMBOL_PROTO(futimes);
76 EXPORT_SYMBOL_PROTO(chmod);
77 EXPORT_SYMBOL_PROTO(fchmod);
78 EXPORT_SYMBOL_PROTO(rename);
79 EXPORT_SYMBOL_PROTO(__xmknod);
80 
81 EXPORT_SYMBOL_PROTO(symlink);
82 EXPORT_SYMBOL_PROTO(link);
83 EXPORT_SYMBOL_PROTO(unlink);
84 EXPORT_SYMBOL_PROTO(readlink);
85 
86 EXPORT_SYMBOL_PROTO(mkdir);
87 EXPORT_SYMBOL_PROTO(rmdir);
88 EXPORT_SYMBOL_PROTO(opendir);
89 EXPORT_SYMBOL_PROTO(readdir);
90 EXPORT_SYMBOL_PROTO(closedir);
91 EXPORT_SYMBOL_PROTO(seekdir);
92 EXPORT_SYMBOL_PROTO(telldir);
93 
94 EXPORT_SYMBOL_PROTO(ioctl);
95 
96 EXPORT_SYMBOL_PROTO(pread64);
97 EXPORT_SYMBOL_PROTO(pwrite64);
98 
99 EXPORT_SYMBOL_PROTO(statfs);
100 EXPORT_SYMBOL_PROTO(statfs64);
101 
102 EXPORT_SYMBOL_PROTO(getuid);
103 
104 EXPORT_SYMBOL_PROTO(fsync);
105 EXPORT_SYMBOL_PROTO(fdatasync);
106 
107 EXPORT_SYMBOL_PROTO(lstat64);
108 EXPORT_SYMBOL_PROTO(fstat64);
109 EXPORT_SYMBOL_PROTO(mknod);
110 
111 /* Export symbols used by GCC for the stack protector. */
112 extern void __stack_smash_handler(void *) __attribute__((weak));
113 EXPORT_SYMBOL(__stack_smash_handler);
114 
115 extern long __guard __attribute__((weak));
116 EXPORT_SYMBOL(__guard);
117 
118 #ifdef _FORTIFY_SOURCE
119 extern int __sprintf_chk(char *str, int flag, size_t strlen, const char *format);
120 EXPORT_SYMBOL(__sprintf_chk);
121 #endif
122