1 /* LINTLIBRARY */
2 /*-
3 * SPDX-License-Identifier: BSD-4-Clause
4 *
5 * Copyright 2001 David E. O'Brien.
6 * All rights reserved.
7 * Copyright 1996-1998 John D. Polstra.
8 * All rights reserved.
9 * Copyright (c) 1997 Jason R. Thorpe.
10 * Copyright (c) 1995 Christopher G. Demetriou
11 * All rights reserved.
12 *
13 * Redistribution and use in source and binary forms, with or without
14 * modification, are permitted provided that the following conditions
15 * are met:
16 * 1. Redistributions of source code must retain the above copyright
17 * notice, this list of conditions and the following disclaimer.
18 * 2. Redistributions in binary form must reproduce the above copyright
19 * notice, this list of conditions and the following disclaimer in the
20 * documentation and/or other materials provided with the distribution.
21 * 3. All advertising materials mentioning features or use of this software
22 * must display the following acknowledgement:
23 * This product includes software developed for the
24 * FreeBSD Project. See https://www.freebsd.org/ for
25 * information about FreeBSD.
26 * This product includes software developed for the
27 * NetBSD Project. See http://www.netbsd.org/ for
28 * information about NetBSD.
29 * 4. The name of the author may not be used to endorse or promote products
30 * derived from this software without specific prior written permission
31 *
32 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
33 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
34 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
35 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
36 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
37 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
38 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
39 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
40 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
41 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
42 */
43
44 #include <sys/cdefs.h>
45 #include <stdlib.h>
46 #include <stdint.h>
47 #include <sys/elf.h>
48
49 static uint32_t cpu_features;
50 static uint32_t cpu_features2;
51
52 #include "libc_private.h"
53 #include "ignore_init.c"
54
55 struct Struct_Obj_Entry;
56 struct ps_strings;
57
58 extern void _start(int, char **, char **, const struct Struct_Obj_Entry *,
59 void (*)(void), struct ps_strings *);
60
61 #ifdef GCRT
62 extern void _mcleanup(void);
63 extern void monstartup(void *, void *);
64 extern int eprol;
65 extern int etext;
66 #endif
67
68 struct ps_strings *__ps_strings;
69
70 static void
init_cpu_features(char ** env)71 init_cpu_features(char **env)
72 {
73 const Elf_Auxinfo *aux;
74
75 /* Find the auxiliary vector on the stack. */
76 while (*env++ != 0) /* Skip over environment, and NULL terminator */
77 ;
78 aux = (const Elf_Auxinfo *)env;
79
80 /* Digest the auxiliary vector. */
81 for (; aux->a_type != AT_NULL; aux++) {
82 switch (aux->a_type) {
83 case AT_HWCAP:
84 cpu_features = (uint32_t)aux->a_un.a_val;
85 break;
86 case AT_HWCAP2:
87 cpu_features2 = (uint32_t)aux->a_un.a_val;
88 break;
89 }
90 }
91 }
92
93
94 /* The entry function. */
95 /*
96 * First 5 arguments are specified by the PowerPC SVR4 ABI.
97 * The last argument, ps_strings, is a BSD extension.
98 */
99 /* ARGSUSED */
100 void
_start(int argc,char ** argv,char ** env,const struct Struct_Obj_Entry * obj __unused,void (* cleanup)(void),struct ps_strings * ps_strings)101 _start(int argc, char **argv, char **env,
102 const struct Struct_Obj_Entry *obj __unused, void (*cleanup)(void),
103 struct ps_strings *ps_strings)
104 {
105
106 handle_argv(argc, argv, env);
107
108 if (ps_strings != (struct ps_strings *)0)
109 __ps_strings = ps_strings;
110
111 if (&_DYNAMIC != NULL)
112 atexit(cleanup);
113 else {
114 init_cpu_features(env);
115 process_irelocs();
116 _init_tls();
117 }
118
119 #ifdef GCRT
120 atexit(_mcleanup);
121 monstartup(&eprol, &etext);
122 #endif
123
124 handle_static_init(argc, argv, env);
125 exit(main(argc, argv, env));
126 }
127
128 #ifdef GCRT
129 __asm__(".text");
130 __asm__("eprol:");
131 __asm__(".previous");
132 #endif
133