crt1.c revision 330897 
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 http://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__FBSDID("$FreeBSD: stable/11/lib/csu/arm/crt1.c 330897 2018-03-14 03:19:51Z eadler $");
46
47#include <stdlib.h>
48
49#include "libc_private.h"
50#include "crtbrand.c"
51#include "ignore_init.c"
52
53struct Struct_Obj_Entry;
54struct ps_strings;
55
56extern void _start(int, char **, char **, const struct Struct_Obj_Entry *,
57    void (*)(void), struct ps_strings *);
58
59#ifdef GCRT
60extern void _mcleanup(void);
61extern void monstartup(void *, void *);
62extern int eprol;
63extern int etext;
64#endif
65
66struct ps_strings *__ps_strings;
67
68void __start(int, char **, char **, struct ps_strings *,
69    const struct Struct_Obj_Entry *, void (*)(void));
70
71/* The entry function. */
72__asm("	.text			\n"
73"	.align	0		\n"
74"	.globl	_start		\n"
75"	_start:			\n"
76"	mov	r5, r2		/* cleanup */		\n"
77"	mov	r4, r1		/* obj_main */		\n"
78"	mov	r3, r0		/* ps_strings */	\n"
79"	/* Get argc, argv, and envp from stack */	\n"
80"	ldr	r0, [sp, #0x0000]	\n"
81"	add	r1, sp, #0x0004		\n"
82"	add	r2, r1, r0, lsl #2	\n"
83"	add	r2, r2, #0x0004		\n"
84"	/* Ensure the stack is properly aligned before calling C code. */\n"
85"	bic	sp, sp, #7	\n"
86"	sub	sp, sp, #8	\n"
87"	str	r5, [sp, #4]	\n"
88"	str	r4, [sp, #0]	\n"
89"\n"
90"	b	 __start  ");
91/* ARGSUSED */
92void
93__start(int argc, char **argv, char **env, struct ps_strings *ps_strings,
94    const struct Struct_Obj_Entry *obj __unused, void (*cleanup)(void))
95{
96
97	handle_argv(argc, argv, env);
98
99	if (ps_strings != (struct ps_strings *)0)
100		__ps_strings = ps_strings;
101
102	if (&_DYNAMIC != NULL)
103		atexit(cleanup);
104	else
105		_init_tls();
106#ifdef GCRT
107	atexit(_mcleanup);
108	monstartup(&eprol, &etext);
109#endif
110	handle_static_init(argc, argv, env);
111	exit(main(argc, argv, env));
112}
113
114static const struct {
115	int32_t	namesz;
116	int32_t	descsz;
117	int32_t	type;
118	char	name[sizeof(NOTE_FREEBSD_VENDOR)];
119	char	desc[sizeof(MACHINE_ARCH)];
120} archtag __attribute__ ((section (NOTE_SECTION), aligned(4))) __used = {
121	.namesz = sizeof(NOTE_FREEBSD_VENDOR),
122	.descsz = sizeof(MACHINE_ARCH),
123	.type = ARCH_NOTETYPE,
124	.name = NOTE_FREEBSD_VENDOR,
125	.desc = MACHINE_ARCH
126};
127
128#ifdef GCRT
129__asm__(".text");
130__asm__("eprol:");
131__asm__(".previous");
132#endif
133