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
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
|
/* $Id$ */
/* From: NetBSD: crt0.c,v 1.11 1997/10/20 20:41:09 thorpej Exp */
/*
* Copyright (c) 1995 Christopher G. Demetriou
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Christopher G. Demetriou
* for the NetBSD Project.
* 4. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifdef ECOFF_COMPAT
#undef DYNAMIC
#endif
#include <sys/param.h>
#include <sys/exec.h>
#include <sys/syscall.h>
#include <vm/vm.h>
#include <stdlib.h>
#ifdef DYNAMIC
#include <dlfcn.h>
#include "rtld.h"
#else
typedef void Obj_Entry;
#endif
/*
* Lots of the chunks of this file cobbled together from pieces of
* other NetBSD crt files, including the common code.
*/
extern int __syscall __P((int, ...));
#define _exit(v) __syscall(SYS_exit, (v))
#define write(fd, s, n) __syscall(SYS_write, (fd), (s), (n))
#define _FATAL(str) \
do { \
write(2, str, sizeof(str)); \
_exit(1); \
} while (0)
static char *_strrchr __P((char *, char));
char **environ;
char *__progname = "";
struct ps_strings *__ps_strings = 0;
#ifndef ECOFF_COMPAT
extern void __init __P((void));
extern void __fini __P((void));
#endif /* ECOFF_COMPAT */
#ifdef DYNAMIC
void rtld_setup __P((void (*)(void), const Obj_Entry *obj));
const Obj_Entry *__mainprog_obj;
/*
* Arrange for _DYNAMIC to be weak and undefined (and therefore to show up
* as being at address zero, unless something else defines it). That way,
* if we happen to be compiling without -static but with without any
* shared libs present, things will still work.
*/
asm(".weak _DYNAMIC");
extern int _DYNAMIC;
#endif /* DYNAMIC */
#ifdef MCRT0
extern void monstartup __P((u_long, u_long));
extern void _mcleanup __P((void));
extern unsigned char _etext, _eprol;
#endif /* MCRT0 */
void __start __P((char **, void (*cleanup) __P((void)), const Obj_Entry *,
struct ps_strings *));
int main __P((int, char **, char **));
void
__start(sp, cleanup, obj, ps_strings)
char **sp;
void (*cleanup) __P((void)); /* from shared loader */
const Obj_Entry *obj; /* from shared loader */
struct ps_strings *ps_strings;
{
long argc;
char **argv, *namep;
argc = *(long *)sp;
argv = sp + 1;
environ = sp + 2 + argc; /* 2: argc + NULL ending argv */
if ((namep = argv[0]) != NULL) { /* NULL ptr if argc = 0 */
if ((__progname = _strrchr(namep, '/')) == NULL)
__progname = namep;
else
__progname++;
}
if (ps_strings != (struct ps_strings *)0 &&
ps_strings != (struct ps_strings *)0xbabefacedeadbeef)
__ps_strings = ps_strings;
#ifdef DYNAMIC
if (&_DYNAMIC != NULL)
rtld_setup(cleanup, obj);
#endif
#ifdef MCRT0
atexit(_mcleanup);
monstartup((u_long)&_eprol, (u_long)&_etext);
#endif
#ifndef ECOFF_COMPAT
atexit(__fini);
__init();
#endif /* ECOFF_COMPAT */
exit(main(argc, argv, environ));
}
/*
* NOTE: Leave the RCS ID _after_ __start(), in case it gets placed in .text.
*/
#if defined(LIBC_SCCS) && !defined(lint)
__RCSID("$NetBSD: crt0.c,v 1.11 1997/10/20 20:41:09 thorpej Exp $");
#endif /* LIBC_SCCS and not lint */
static char *
_strrchr(p, ch)
register char *p, ch;
{
register char *save;
for (save = NULL;; ++p) {
if (*p == ch)
save = (char *)p;
if (!*p)
return(save);
}
/* NOTREACHED */
}
#ifdef MCRT0
asm (" .text");
asm ("_eprol:");
#endif
#ifdef DYNAMIC
void
rtld_setup(cleanup, obj)
void (*cleanup) __P((void));
const Obj_Entry *obj;
{
if ((obj == NULL) || (obj->magic != RTLD_MAGIC))
_FATAL("Corrupt Obj_Entry pointer in GOT");
if (obj->version != RTLD_VERSION)
_FATAL("Dynamic linker version mismatch");
__mainprog_obj = obj;
atexit(cleanup);
}
void *
dlopen(name, mode)
const char *name;
int mode;
{
if (__mainprog_obj == NULL)
return NULL;
return (__mainprog_obj->dlopen)(name, mode);
}
int
dlclose(fd)
void *fd;
{
if (__mainprog_obj == NULL)
return -1;
return (__mainprog_obj->dlclose)(fd);
}
void *
dlsym(fd, name)
void *fd;
const char *name;
{
if (__mainprog_obj == NULL)
return NULL;
return (__mainprog_obj->dlsym)(fd, name);
}
#if 0 /* not supported for ELF shlibs, apparently */
int
dlctl(fd, cmd, arg)
void *fd, *arg;
int cmd;
{
if (__mainprog_obj == NULL)
return -1;
return (__mainprog_obj->dlctl)(fd, cmd, arg);
}
#endif
char *
dlerror()
{
if (__mainprog_obj == NULL)
return NULL;
return (__mainprog_obj->dlerror)();
}
#endif /* DYNAMIC */
|
