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d66e34cd | 1 | /* Operating system support for run-time dynamic linker. Generic Unix version. |
bfc04a9f | 2 | Copyright (C) 1995, 96 Free Software Foundation, Inc. |
d66e34cd RM |
3 | This file is part of the GNU C Library. |
4 | ||
5 | The GNU C Library is free software; you can redistribute it and/or | |
6 | modify it under the terms of the GNU Library General Public License as | |
7 | published by the Free Software Foundation; either version 2 of the | |
8 | License, or (at your option) any later version. | |
9 | ||
10 | The GNU C Library is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 | Library General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU Library General Public | |
16 | License along with the GNU C Library; see the file COPYING.LIB. If | |
17 | not, write to the Free Software Foundation, Inc., 675 Mass Ave, | |
18 | Cambridge, MA 02139, USA. */ | |
19 | ||
20 | #include <elf.h> | |
21 | #include <sys/types.h> | |
22 | #include <fcntl.h> | |
23 | #include <link.h> | |
439d1d45 | 24 | #include <unistd.h> |
8d6468d0 RM |
25 | #include <stdarg.h> |
26 | #include <string.h> | |
27 | ||
439d1d45 RM |
28 | |
29 | extern int _dl_argc; | |
30 | extern char **_dl_argv; | |
31 | extern char **_environ; | |
60478656 | 32 | extern void _start (void); |
bfc04a9f | 33 | extern int _dl_secure; |
d66e34cd | 34 | |
8d6468d0 | 35 | ElfW(Addr) |
d66e34cd | 36 | _dl_sysdep_start (void **start_argptr, |
8d6468d0 RM |
37 | void (*dl_main) (const ElfW(Phdr) *phdr, ElfW(Word) phnum, |
38 | ElfW(Addr) *user_entry)) | |
d66e34cd | 39 | { |
8d6468d0 RM |
40 | const ElfW(Phdr) *phdr; |
41 | ElfW(Word) phnum; | |
42 | ElfW(Addr) user_entry; | |
43 | ElfW(auxv_t) *av; | |
d66e34cd RM |
44 | uid_t uid, euid; |
45 | gid_t gid, egid; | |
b0d20a87 | 46 | unsigned int seen; |
d66e34cd | 47 | |
8d6468d0 RM |
48 | user_entry = (ElfW(Addr)) &_start; |
49 | _dl_argc = *(long *) start_argptr; | |
24906b43 | 50 | _dl_argv = (char **) start_argptr + 1; |
d66e34cd RM |
51 | _environ = &_dl_argv[_dl_argc + 1]; |
52 | start_argptr = (void **) _environ; | |
53 | while (*start_argptr) | |
54 | ++start_argptr; | |
55 | ||
b0d20a87 RM |
56 | seen = 0; |
57 | #define M(type) (1 << (type)) | |
58 | ||
59 | for (av = (void *) ++start_argptr; | |
60 | av->a_type != AT_NULL; | |
61 | seen |= M ((++av)->a_type)) | |
d66e34cd RM |
62 | switch (av->a_type) |
63 | { | |
64 | case AT_PHDR: | |
65 | phdr = av->a_un.a_ptr; | |
66 | break; | |
67 | case AT_PHNUM: | |
68 | phnum = av->a_un.a_val; | |
69 | break; | |
70 | case AT_ENTRY: | |
71 | user_entry = av->a_un.a_val; | |
60478656 | 72 | break; |
d66e34cd RM |
73 | case AT_UID: |
74 | uid = av->a_un.a_val; | |
75 | break; | |
76 | case AT_GID: | |
77 | gid = av->a_un.a_val; | |
78 | break; | |
79 | case AT_EUID: | |
80 | euid = av->a_un.a_val; | |
81 | break; | |
82 | case AT_EGID: | |
83 | egid = av->a_un.a_val; | |
84 | break; | |
85 | } | |
86 | ||
b0d20a87 RM |
87 | /* Linux doesn't provide us with any of these values on the stack |
88 | when the dynamic linker is run directly as a program. */ | |
89 | ||
90 | #define SEE(UID, uid) if ((seen & M (AT_##UID)) == 0) uid = __get##uid () | |
91 | SEE (UID, uid); | |
92 | SEE (GID, gid); | |
93 | SEE (EUID, euid); | |
94 | SEE (EGID, egid); | |
95 | ||
96 | ||
d66e34cd RM |
97 | _dl_secure = uid != euid || gid != egid; |
98 | ||
376fd36e RM |
99 | #ifdef DL_SYSDEP_INIT |
100 | DL_SYSDEP_INIT; | |
101 | #endif | |
102 | ||
d66e34cd | 103 | (*dl_main) (phdr, phnum, &user_entry); |
24906b43 | 104 | return user_entry; |
d66e34cd RM |
105 | } |
106 | ||
a5a81fec RM |
107 | void |
108 | _dl_sysdep_start_cleanup (void) | |
109 | { | |
110 | } | |
111 | ||
d66e34cd RM |
112 | int |
113 | _dl_sysdep_open_zero_fill (void) | |
114 | { | |
564210fe | 115 | return __open ("/dev/zero", O_RDONLY); |
d66e34cd RM |
116 | } |
117 | ||
d66e34cd RM |
118 | void |
119 | _dl_sysdep_fatal (const char *msg, ...) | |
120 | { | |
121 | va_list ap; | |
122 | ||
123 | va_start (ap, msg); | |
124 | do | |
125 | { | |
126 | size_t len = strlen (msg); | |
564210fe | 127 | __write (STDERR_FILENO, msg, len); |
d66e34cd RM |
128 | msg = va_arg (ap, const char *); |
129 | } while (msg); | |
130 | va_end (ap); | |
131 | ||
132 | _exit (127); | |
133 | } | |
6a76c115 RM |
134 | |
135 | ||
136 | void | |
137 | _dl_sysdep_message (const char *msg, ...) | |
138 | { | |
139 | va_list ap; | |
140 | ||
141 | va_start (ap, msg); | |
142 | do | |
143 | { | |
144 | size_t len = strlen (msg); | |
564210fe | 145 | __write (STDOUT_FILENO, msg, len); |
6a76c115 RM |
146 | msg = va_arg (ap, const char *); |
147 | } while (msg); | |
148 | va_end (ap); | |
149 | } |