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
|
/* Copyright (C) 1998,2000,2001,2002 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. */
#include <stdlib.h>
#include <unistd.h>
#include <ldsodefs.h>
#include <bp-start.h>
#include <bp-sym.h>
extern void __libc_init_first (int argc, char **argv, char **envp);
extern int _dl_starting_up;
weak_extern (_dl_starting_up)
extern int __cache_line_size;
weak_extern (__cache_line_size)
extern int __libc_multiple_libcs;
extern void *__libc_stack_end;
struct startup_info
{
void *__unbounded sda_base;
int (*main) (int, char **, char **, void *);
int (*init) (int, char **, char **, void *);
void (*fini) (void);
};
/* Scan the Aux Vector for the "Data Cache Block Size" entry. If found
verify that the static extern __cache_line_size is defined by checking
for not NULL. If it is defined then assign the cache block size
value to __cache_line_size. */
static inline void
__aux_init_cache (ElfW(auxv_t) *av)
{
for (; av->a_type != AT_NULL; ++av)
switch (av->a_type)
{
case AT_DCACHEBSIZE:
{
int *cls = & __cache_line_size;
if (cls != NULL)
*cls = av->a_un.a_val;
}
break;
}
}
int
/* GKM FIXME: GCC: this should get __BP_ prefix by virtue of the
BPs in the arglist of startup_info.main and startup_info.init. */
BP_SYM (__libc_start_main) (int argc, char *__unbounded *__unbounded ubp_av,
char *__unbounded *__unbounded ubp_ev,
ElfW(auxv_t) *__unbounded auxvec, void (*rtld_fini) (void),
struct startup_info *__unbounded stinfo,
char *__unbounded *__unbounded stack_on_entry)
{
#if __BOUNDED_POINTERS__
char **argv;
#else
# define argv ubp_av
#endif
#ifndef SHARED
/* The next variable is only here to work around a bug in gcc <= 2.7.2.2.
If the address would be taken inside the expression the optimizer
would try to be too smart and throws it away. Grrr. */
int *dummy_addr = &_dl_starting_up;
__libc_multiple_libcs = dummy_addr && !_dl_starting_up;
#endif
/* the PPC SVR4 ABI says that the top thing on the stack will
be a NULL pointer, so if not we assume that we're being called
as a statically-linked program by Linux... */
if (*stack_on_entry != NULL)
{
char *__unbounded *__unbounded temp;
/* ...in which case, we have argc as the top thing on the
stack, followed by argv (NULL-terminated), envp (likewise),
and the auxilary vector. */
argc = *(int *__unbounded) stack_on_entry;
ubp_av = stack_on_entry + 1;
ubp_ev = ubp_av + argc + 1;
#ifdef HAVE_AUX_VECTOR
temp = ubp_ev;
while (*temp != NULL)
++temp;
auxvec = (ElfW(auxv_t) *)++temp;
# ifndef SHARED
_dl_aux_init ((ElfW(auxv_t) *) auxvec);
# endif
#endif
rtld_fini = NULL;
}
INIT_ARGV_and_ENVIRON;
/* Initialize the __cache_line_size variable from the aux vector. */
__aux_init_cache((ElfW(auxv_t) *) auxvec);
/* Store something that has some relationship to the end of the
stack, for backtraces. This variable should be thread-specific. */
__libc_stack_end = stack_on_entry + 4;
/* Register the destructor of the dynamic linker if there is any. */
if (rtld_fini != NULL)
__cxa_atexit ((void (*) (void *)) rtld_fini, NULL, NULL);
/* Call the initializer of the libc. */
#ifdef SHARED
if (__builtin_expect (GL(dl_debug_mask) & DL_DEBUG_IMPCALLS, 0))
_dl_debug_printf ("\ninitialize libc\n\n");
#endif
__libc_init_first (argc, argv, __environ);
/* Register the destructor of the program, if any. */
if (stinfo->fini)
__cxa_atexit ((void (*) (void *)) stinfo->fini, NULL, NULL);
/* Call the initializer of the program, if any. */
#ifdef SHARED
if (__builtin_expect (GL(dl_debug_mask) & DL_DEBUG_IMPCALLS, 0))
_dl_debug_printf ("\ninitialize program: %s\n\n", argv[0]);
#endif
if (stinfo->init)
stinfo->init (argc, argv, __environ, auxvec);
#ifdef SHARED
if (__builtin_expect (GL(dl_debug_mask) & DL_DEBUG_IMPCALLS, 0))
_dl_debug_printf ("\ntransferring control: %s\n\n", argv[0]);
#endif
exit (stinfo->main (argc, argv, __environ, auxvec));
}
|
