]>
sourceware.org Git - glibc.git/blob - elf/dl-init.c
ba4d2fdc859c563ecbfa607d7ea6c1159ed4518f
1 /* Run initializers for newly loaded objects.
2 Copyright (C) 1995-2023 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
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 Lesser General Public License for more details.
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <https://www.gnu.org/licenses/>. */
22 #include <elf-initfini.h>
26 call_init (struct link_map
*l
, int argc
, char **argv
, char **env
)
28 /* Do not run constructors for proxy objects. */
32 /* If the object has not been relocated, this is a bug. The
33 function pointers are invalid in this case. (Executables do not
35 assert (l
->l_relocated
|| l
->l_type
== lt_executable
);
38 /* This object is all done. */
41 /* Avoid handling this constructor again in case we have a circular
45 /* Check for object which constructors we do not run here. */
46 if (__builtin_expect (l
->l_name
[0], 'a') == '\0'
47 && l
->l_type
== lt_executable
)
50 /* Print a debug message if wanted. */
51 if (__glibc_unlikely (GLRO(dl_debug_mask
) & DL_DEBUG_IMPCALLS
))
52 _dl_debug_printf ("\ncalling init: %s\n\n",
53 DSO_FILENAME (l
->l_name
));
55 /* Now run the local constructors. There are two forms of them:
56 - the one named by DT_INIT
57 - the others in the DT_INIT_ARRAY.
59 if (ELF_INITFINI
&& l
->l_info
[DT_INIT
] != NULL
)
60 DL_CALL_DT_INIT(l
, l
->l_addr
+ l
->l_info
[DT_INIT
]->d_un
.d_ptr
, argc
, argv
, env
);
62 /* Next see whether there is an array with initialization functions. */
63 ElfW(Dyn
) *init_array
= l
->l_info
[DT_INIT_ARRAY
];
64 if (init_array
!= NULL
)
70 jm
= l
->l_info
[DT_INIT_ARRAYSZ
]->d_un
.d_val
/ sizeof (ElfW(Addr
));
72 addrs
= (ElfW(Addr
) *) (init_array
->d_un
.d_ptr
+ l
->l_addr
);
73 for (j
= 0; j
< jm
; ++j
)
74 ((dl_init_t
) addrs
[j
]) (argc
, argv
, env
);
80 _dl_init (struct link_map
*main_map
, int argc
, char **argv
, char **env
)
82 ElfW(Dyn
) *preinit_array
= main_map
->l_info
[DT_PREINIT_ARRAY
];
83 ElfW(Dyn
) *preinit_array_size
= main_map
->l_info
[DT_PREINIT_ARRAYSZ
];
86 if (__glibc_unlikely (GL(dl_initfirst
) != NULL
))
88 call_init (GL(dl_initfirst
), argc
, argv
, env
);
89 GL(dl_initfirst
) = NULL
;
92 /* Don't do anything if there is no preinit array. */
93 if (__builtin_expect (preinit_array
!= NULL
, 0)
94 && preinit_array_size
!= NULL
95 && (i
= preinit_array_size
->d_un
.d_val
/ sizeof (ElfW(Addr
))) > 0)
100 if (__glibc_unlikely (GLRO(dl_debug_mask
) & DL_DEBUG_IMPCALLS
))
101 _dl_debug_printf ("\ncalling preinit: %s\n\n",
102 DSO_FILENAME (main_map
->l_name
));
104 addrs
= (ElfW(Addr
) *) (preinit_array
->d_un
.d_ptr
+ main_map
->l_addr
);
105 for (cnt
= 0; cnt
< i
; ++cnt
)
106 ((dl_init_t
) addrs
[cnt
]) (argc
, argv
, env
);
109 /* Stupid users forced the ELF specification to be changed. It now
110 says that the dynamic loader is responsible for determining the
111 order in which the constructors have to run. The constructors
112 for all dependencies of an object must run before the constructor
113 for the object itself. Circular dependencies are left unspecified.
115 This is highly questionable since it puts the burden on the dynamic
116 loader which has to find the dependencies at runtime instead of
117 letting the user do it right. Stupidity rules! */
119 i
= main_map
->l_searchlist
.r_nlist
;
121 call_init (main_map
->l_initfini
[i
], argc
, argv
, env
);
123 #ifndef HAVE_INLINED_SYSCALLS
124 /* Finished starting up. */
This page took 0.042329 seconds and 5 git commands to generate.