1/* Startup code for ARC.
 2   Copyright (C) 2020-2025 Free Software Foundation, Inc.
 3   This file is part of the GNU C Library.
 4
 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.
 9
10   In addition to the permissions in the GNU Lesser General Public
11   License, the Free Software Foundation gives you unlimited
12   permission to link the compiled version of this file with other
13   programs, and to distribute those programs without any restriction
14   coming from the use of this file. (The GNU Lesser General Public
15   License restrictions do apply in other respects; for example, they
16   cover modification of the file, and distribution when not linked
17   into another program.)
18
19   Note that people who make modified versions of this file are not
20   obligated to grant this special exception for their modified
21   versions; it is their choice whether to do so. The GNU Lesser
22   General Public License gives permission to release a modified
23   version without this exception; this exception also makes it
24   possible to release a modified version which carries forward this
25   exception.
26
27   The GNU C Library is distributed in the hope that it will be useful,
28   but WITHOUT ANY WARRANTY; without even the implied warranty of
29   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
30   Lesser General Public License for more details.
31
32   You should have received a copy of the GNU Lesser General Public
33   License along with the GNU C Library; if not, see
34   <https://www.gnu.org/licenses/>.  */
35
36#define __ASSEMBLY__ 1
37#include <entry.h>
38#include <sysdep.h>
39
40#ifndef ENTRY_POINT
41# error ENTRY_POINT needs to be defined for ARC
42#endif
43
44/* When we enter this piece of code, the program stack looks like this:
45        argc            argument counter (integer)
46        argv[0]         program name (pointer)
47        argv[1...N]     program args (pointers)
48        argv[argc-1]    end of args (integer)
49        NULL
50        env[0...N]      environment variables (pointers)
51        NULL.  */
52
53ENTRY (ENTRY_POINT)
54
55	/* Needed to make gdb backtraces stop here.  */
56	.cfi_label .Ldummy
57	cfi_undefined (blink)
58
59	mov	fp, 0
60	ld_s	r1, [sp]	/* argc.  */
61
62	mov_s	r5, r0		/* rltd_fini.  */
63	add_s	r2, sp, 4	/* argv.  */
64	and	sp, sp, -8
65	mov	r6, sp
66
67	/* __libc_start_main (main, argc, argv, init, fini, rtld_fini, stack_end).  */
68
69	mov_s	r3, 0 		/* Used to be init.  */
70	mov	r4, 0		/* Used to be fini.  */
71
72#ifdef SHARED
73	ld	r0, [pcl, @main@gotpc]
74	bl	__libc_start_main@plt
75#else
76	mov_s	r0, main
77	bl	__libc_start_main
78#endif
79
80	/* Should never get here.  */
81	flag    1
82END (ENTRY_POINT)
83
84/* Define a symbol for the first piece of initialized data.  */
85	.data
86	.globl __data_start
87__data_start:
88	.long 0
89	.weak data_start
90	data_start = __data_start