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
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
|
/* Copyright (C) 1991, 93, 1995-1998, 2000, 2001 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */
/* Old compatibility names for C types. */
typedef unsigned char uchar; /* sb in libc/posix/types.h */
#include <stdarg.h>
#include <stdlib.h>
#include <sys/types.h>
#include <xcoff.h>
#include <rtinit.h>
#include <dlldr.h>
#include <bits/libc-lock.h>
/* The first piece of initialized data. */
int __data_start = 0;
#ifndef HAVE_ELF
/* Since gcc/crtstuff.c won't define it unless the ELF format is used
we will need to define it here. */
void *__dso_handle = NULL;
#endif
extern int errno;
/* extern __pthread_init; */
typedef void (*FPV)(void);
typedef struct crt0_info
{
int *p_argc;
FPV threads_init;
} INFO;
INFO crt0_info;
int argc;
char **argv;
char **__environ;
int module_count;
caddr_t text_origin;
caddr_t data_origin;
asm("
.toc
LL..0: .tc argc[TC],argc
LL..1: .tc argv[TC],argv
LL..2: .tc __environ[TC],__environ
LL..3: .tc module_count[TC],module_count
LL..4: .tc text_origin[TC],text_origin
LL..5: .tc data_origin[TC],data_origin
");
int main (int argc,char **argv,char **__environ);
int modinit(int argc,INFO *crt0_info, int module_count,
caddr_t text_origin, caddr_t data_origin);
void mod_init1(void *handler,__RTINIT *rti);
__RTINIT *find_rtinit(caddr_t text_origin,caddr_t data_origin, int module_count);
extern int *__loadx();
void __start(void)
{
#ifdef __64BIT__
asm("
ld 17,LL..0(2) # argc
std 14,0(17) # copy reg14 to argc
ld 17,LL..1(2) # argv
std 15,0(17) # copy reg15 to argv
ld 17,LL..2(2) # envp
std 16,0(17) # copy reg16 to envp
ld 17,LL..3(2) # module_count
std 30,0(17) # copy reg30 to module_count
ld 17,LL..4(2) # text_origin
std 29,0(17) # copy reg29 to text_origin
ld 17,LL..5(2) # data_origin
std 28,0(17) # copy reg28 to data_origin
");
#else
asm("
lwz 17,LL..0(2) # argc
stw 3,0(17) # copy reg3 to argc
lwz 17,LL..1(2) # argv
stw 4,0(17) # copy reg4 to argv
lwz 17,LL..2(2) # envp
stw 5,0(17) # copy reg5 to envp
lwz 17,LL..3(2) # module_count
stw 30,0(17) # copy reg30 to module_count
lwz 17,LL..4(2) # text_origin
stw 29,0(17) # copy reg29 to text_origin
lwz 17,LL..5(2) # data_origin
stw 28,0(17) # copy reg28 to data_origin
");
#endif
crt0_info.p_argc = (int*)&argc;
/* crt0_info.threads_init = (FPV) &__pthread_init; */
/*
* Do run-time linking, if enabled and call the init()
* for all loaded modules.
*/
argc = modinit(argc,&crt0_info,module_count,text_origin,data_origin);
errno=0;
/*
* Call the user program.
*/
exit (main (argc, argv, __environ));
}
/*
* The modinit() function performs run-time linking,
* if enabled, and calling the init() function for
* all loaded modules.
*
* int modinit(argc,crt0_info,module_count,text,data)
*
* argc - current value of argc.
* info - crt0 information passed
* module_count - number of modules loaded.
* text - Beginning of text address
* data - Beginning of data address
*/
#define DL_BUFFER_SIZE 1000
int modinit(int argc,INFO *crt0_info, int module_count,
caddr_t text_origin, caddr_t data_origin)
{
int *handler = 0;
__RTINIT *rtinit_info = 0;
int flag;
DL_INFO dl_buffer[DL_BUFFER_SIZE];
DL_INFO *dl_info = dl_buffer;
int i;
FPV p;
__libc_lock_define_initialized(static,modinit_lock);
/*
* try to find __rtinit symbols
*/
rtinit_info = find_rtinit(text_origin,data_origin,module_count);
flag = DL_EXECQ;
if (rtinit_info && rtinit_info->rtl) flag |= DL_LOAD_RTL;
/*
* get a list of modules that have __rtinit
*/
if (__loadx(flag, dl_info, sizeof(dl_buffer))) exit(0x90);
if (( dl_info[0].dlinfo_xflags & DL_INFO_OK))
{
rtinit_info = find_rtinit(dl_info[1].dlinfo_textorg,
dl_info[1].dlinfo_dataorg,
module_count);
if ((rtinit_info != NULL) & (rtinit_info->rtl != NULL))
{
if((*rtinit_info->rtl)(dl_info,0)) exit(0x90);
}
}
/*
* initialize threads in case any init
* functions need thread functions
*/
if (crt0_info->threads_init)
(*crt0_info->threads_init)();
p = (FPV) __loadx(DL_GLOBALSYM | DL_SRCHLOADLIST,"pthread_init");
if (p)
(*p)();
__libc_lock_lock(modinit_lock);
/*
* initialization each module loaded that has __rtinit.
*/
if (( dl_info[0].dlinfo_xflags & DL_INFO_OK))
{
for (i=1; i < dl_info[0].dlinfo_arraylen + 1; i++)
{
if (dl_info[i].dlinfo_flags & DL_HAS_RTINIT)
{
rtinit_info = find_rtinit(dl_info[i].dlinfo_textorg,
dl_info[i].dlinfo_dataorg,
module_count);
if (rtinit_info)
{
mod_init1(handler,rtinit_info);
}
}
}
}
__libc_lock_unlock(modinit_lock);
/*
* reload argc if needed.
*/
return((int) (*crt0_info->p_argc));
}
/*
* The mod_init1 calls every initialization function
* for a given module.
*
* void mod_init1(handler, rti)
*
* void *handler - if NULL init funtions for modules loaded at exec time
* are being executed. Otherwise, the handler points to the
* module loaded.
*
* __RTINIT *rti - pointer to __rtinit data structure (with rti->init_offset
* not equal to zero)
*/
void mod_init1(void *handler,__RTINIT *rtl)
{
__RTINIT_DESCRIPTOR *descriptor;
descriptor =(__RTINIT_DESCRIPTOR *) ((caddr_t)&rtl->rtl + rtl->init_offset);
while (descriptor->f)
{
if (!(descriptor->flags & _RT_CALLED))
{
descriptor->flags |= _RT_CALLED;
( descriptor->f )(handler,rtl,descriptor); /* execute init/fini */
}
descriptor = (__RTINIT_DESCRIPTOR *) ((caddr_t)descriptor +
rtl->__rtinit_descriptor_size);
}
}
/*
* Find __rtinit symbol
*
* __RTINIT *find_rtinit(caddr_t text_origin)
*
* caddr_t text_origin - Beginning of text area
* caddr_t data_origin - Beginning of data area
* int module_count - Number of modules loaded
* __RTINIT *rti - pointer to __rtinit data structure
*/
__RTINIT *find_rtinit(caddr_t text_origin, caddr_t data_origin, int module_count)
{
struct xcoffhdr *xcoff_hdr;
SCNHDR *sec_hdr;
SCNHDR *ldr_sec_hdr;
SCNHDR *data_sec_hdr;
LDSYM *ldsym_hdr;
__RTINIT *rtl;
xcoff_hdr = (struct xcoffhdr *) text_origin;
sec_hdr = (SCNHDR *) ((caddr_t)&xcoff_hdr->aouthdr +
xcoff_hdr->filehdr.f_opthdr);
ldr_sec_hdr = (SCNHDR *) (sec_hdr + (xcoff_hdr->aouthdr.o_snloader - 1));
ldsym_hdr = (LDSYM *) ((caddr_t)xcoff_hdr + ldr_sec_hdr->s_scnptr +
LDHDRSZ);
if ( module_count <= 0)
{
if ( !(ldr_sec_hdr->s_scnptr) ) return ((__RTINIT *) 0);
if ( memcmp(ldsym_hdr,RTINIT_NAME,sizeof(RTINIT_NAME)-1))
return ((__RTINIT *) 0);
}
data_sec_hdr = (SCNHDR *) (sec_hdr + (xcoff_hdr->aouthdr.o_sndata - 1));
rtl = (__RTINIT *) (ldsym_hdr->l_value +
(data_origin - data_sec_hdr->s_vaddr));
return(rtl);
}
|
