1 /*-
2 * SPDX-License-Identifier: BSD-1-Clause
3 *
4 * Copyright 2012 Konstantin Belousov <kib@FreeBSD.org>
5 * Copyright (c) 2018, 2023 The FreeBSD Foundation
6 *
7 * Parts of this software was developed by Konstantin Belousov
8 * <kib@FreeBSD.org> under sponsorship from the FreeBSD Foundation.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26 */
27
28 #include <sys/param.h>
29 #include <sys/elf.h>
30 #include <sys/elf_common.h>
31 #include <stdlib.h>
32 #include "libc_private.h"
33
34 extern void (*__preinit_array_start[])(int, char **, char **) __hidden;
35 extern void (*__preinit_array_end[])(int, char **, char **) __hidden;
36 extern void (*__init_array_start[])(int, char **, char **) __hidden;
37 extern void (*__init_array_end[])(int, char **, char **) __hidden;
38 extern void (*__fini_array_start[])(void) __hidden;
39 extern void (*__fini_array_end[])(void) __hidden;
40 extern void _fini(void) __hidden;
41 extern void _init(void) __hidden;
42
43 extern int _DYNAMIC;
44 #pragma weak _DYNAMIC
45
46 #if defined(CRT_IRELOC_RELA)
47 extern const Elf_Rela __rela_iplt_start[] __weak_symbol __hidden;
48 extern const Elf_Rela __rela_iplt_end[] __weak_symbol __hidden;
49
50 #include "reloc.c"
51
52 static void
process_irelocs(void)53 process_irelocs(void)
54 {
55 const Elf_Rela *r;
56
57 for (r = &__rela_iplt_start[0]; r < &__rela_iplt_end[0]; r++)
58 crt1_handle_rela(r);
59 }
60 #elif defined(CRT_IRELOC_REL)
61 extern const Elf_Rel __rel_iplt_start[] __weak_symbol __hidden;
62 extern const Elf_Rel __rel_iplt_end[] __weak_symbol __hidden;
63
64 #include "reloc.c"
65
66 static void
process_irelocs(void)67 process_irelocs(void)
68 {
69 const Elf_Rel *r;
70
71 for (r = &__rel_iplt_start[0]; r < &__rel_iplt_end[0]; r++)
72 crt1_handle_rel(r);
73 }
74 #elif defined(CRT_IRELOC_SUPPRESS)
75 #else
76 #error "Define platform reloc type"
77 #endif
78
79 #ifndef PIC
80 static void
finalizer(void)81 finalizer(void)
82 {
83 void (*fn)(void);
84 size_t array_size, n;
85
86 array_size = __fini_array_end - __fini_array_start;
87 for (n = array_size; n > 0; n--) {
88 fn = __fini_array_start[n - 1];
89 if ((uintptr_t)fn != 0 && (uintptr_t)fn != 1)
90 (fn)();
91 }
92 _fini();
93 }
94 #endif
95
96 static void
handle_static_init(int argc,char ** argv,char ** env)97 handle_static_init(int argc, char **argv, char **env)
98 {
99 #ifndef PIC
100 void (*fn)(int, char **, char **);
101 size_t array_size, n;
102
103 if (&_DYNAMIC != NULL)
104 return;
105
106 atexit(finalizer);
107
108 array_size = __preinit_array_end - __preinit_array_start;
109 for (n = 0; n < array_size; n++) {
110 fn = __preinit_array_start[n];
111 if ((uintptr_t)fn != 0 && (uintptr_t)fn != 1)
112 fn(argc, argv, env);
113 }
114 _init();
115 array_size = __init_array_end - __init_array_start;
116 for (n = 0; n < array_size; n++) {
117 fn = __init_array_start[n];
118 if ((uintptr_t)fn != 0 && (uintptr_t)fn != 1)
119 fn(argc, argv, env);
120 }
121 #endif
122 }
123
124 static void
handle_argv(int argc,char * argv[],char ** env)125 handle_argv(int argc, char *argv[], char **env)
126 {
127 const char *s;
128
129 if (environ == NULL)
130 environ = env;
131 if (argc > 0 && argv[0] != NULL) {
132 __progname = argv[0];
133 for (s = __progname; *s != '\0'; s++) {
134 if (*s == '/')
135 __progname = s + 1;
136 }
137 }
138 }
139
140 static void
handle_irelocs(char * env[])141 handle_irelocs(char *env[])
142 {
143 #ifndef CRT_IRELOC_SUPPRESS
144 const Elf_Auxinfo *aux;
145
146 /* Find the auxiliary vector on the stack. */
147 while (*env++ != 0) /* Skip over environment, and NULL terminator */
148 ;
149 aux = (const Elf_Auxinfo *)env;
150
151 ifunc_init(aux);
152 process_irelocs();
153 #else
154 (void)env;
155 #endif
156 }
157
158 void
__libc_start1(int argc,char * argv[],char * env[],void (* cleanup)(void),int (* mainX)(int,char * [],char * []))159 __libc_start1(int argc, char *argv[], char *env[], void (*cleanup)(void),
160 int (*mainX)(int, char *[], char *[]))
161 {
162 handle_argv(argc, argv, env);
163
164 if (&_DYNAMIC != NULL) {
165 atexit(cleanup);
166 } else {
167 handle_irelocs(env);
168 _init_tls();
169 }
170
171 handle_static_init(argc, argv, env);
172 exit(mainX(argc, argv, env));
173 }
174
175 /* XXXKIB _mcleanup and monstartup defs */
176 extern void _mcleanup(void);
177 extern void monstartup(void *, void *);
178
179 void
__libc_start1_gcrt(int argc,char * argv[],char * env[],void (* cleanup)(void),int (* mainX)(int,char * [],char * []),int * eprolp,int * etextp)180 __libc_start1_gcrt(int argc, char *argv[], char *env[],
181 void (*cleanup)(void), int (*mainX)(int, char *[], char *[]),
182 int *eprolp, int *etextp)
183 {
184 handle_argv(argc, argv, env);
185
186 if (&_DYNAMIC != NULL) {
187 atexit(cleanup);
188 } else {
189 handle_irelocs(env);
190 _init_tls();
191 }
192
193 atexit(_mcleanup);
194 monstartup(eprolp, etextp);
195
196 handle_static_init(argc, argv, env);
197 exit(mainX(argc, argv, env));
198 }
199