1/* Startup code for ARC.
 2   Copyright (C) 2020-2021 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   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.
14
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/>.  */
18
19#define __ASSEMBLY__ 1
20#include <entry.h>
21#include <sysdep.h>
22
23#ifndef ENTRY_POINT
24# error ENTRY_POINT needs to be defined for ARC
25#endif
26
27/* When we enter this piece of code, the program stack looks like this:
28        argc            argument counter (integer)
29        argv[0]         program name (pointer)
30        argv[1...N]     program args (pointers)
31        argv[argc-1]    end of args (integer)
32        NULL
33        env[0...N]      environment variables (pointers)
34        NULL.  */
35
36ENTRY (ENTRY_POINT)
37
38	/* Needed to make gdb backtraces stop here.  */
39	.cfi_label .Ldummy
40	cfi_undefined (blink)
41
42	mov	fp, 0
43	ld_s	r1, [sp]	/* argc.  */
44
45	mov_s	r5, r0		/* rltd_fini.  */
46	add_s	r2, sp, 4	/* argv.  */
47	and	sp, sp, -8
48	mov	r6, sp
49
50	/* __libc_start_main (main, argc, argv, init, fini, rtld_fini, stack_end).  */
51
52#ifdef SHARED
53	ld	r0, [pcl, @main@gotpc]
54	ld	r3, [pcl, @__libc_csu_init@gotpc]
55	ld	r4, [pcl, @__libc_csu_fini@gotpc]
56	bl	__libc_start_main@plt
57#else
58	mov_s	r0, main
59	mov_s	r3, __libc_csu_init
60	mov	r4, __libc_csu_fini
61	bl	__libc_start_main
62#endif
63
64	/* Should never get here.  */
65	flag    1
66END (ENTRY_POINT)
67
68/* Define a symbol for the first piece of initialized data.  */
69	.data
70	.globl __data_start
71__data_start:
72	.long 0
73	.weak data_start
74	data_start = __data_start