1/* Startup code compliant to the ELF C-SKY ABIV2.
2   Copyright (C) 2018-2021 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   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/* We need to call:
37   __libc_start_main (int (*main) (int, char **, char **), int argc,
38		      char **argv, void (*init) (void), void (*fini) (void),
39		      void (*rtld_fini) (void), void *stack_end)
40 */
41
42#include <sysdep.h>
43
44	.text
45	.globl _start;
46	.type _start,@function;
47	.align 4;
48_start:
49	cfi_startproc
50	.cfi_label .Ldummy
51	cfi_undefined (lr)
52	subi	sp, 8
53	/* Clear the link register since this is the outermost frame.  */
54	movi	lr, 0
55	/* Pop argc off the stack and save a pointer to argv.  */
56	ldw	a1, (sp, 8)	/* Init argc for __libc_start_main.  */
57	addi	a2, sp, 12	/* Init argv for __libc_start_main.  */
58
59	/* Push stack limit.  */
60	stw	a2, (sp, 8)
61	/* Push rtld_fini.  */
62	stw	a0, (sp, 4)
63
64#ifdef SHARED
65	grs	t0, .Lgetpc
66.Lgetpc:
67	lrw	gb, .Lgetpc@GOTPC
68	addu	gb, t0
69
70	movi	a3, 0		/* Used to be init.  */
71	stw 	a3, (sp, 0) 	/* Used to be fini.  */
72
73	lrw	t0, main@GOT
74	addu	t0, gb
75	ldw	a0, (t0, 0)
76	lrw	t1, __libc_start_main@PLT
77	ldr.w	t1, (gb, t1 << 0)
78	jsr	t1
79
80	lrw	t1, abort@PLT
81	ldr.w	t1, (gb, t1 << 0)
82	jsr	t1
83#else
84	movi	a3, 0		/* Used to be init.  */
85	stw 	a3, (sp, 0) 	/* Used to be fini.  */
86	lrw	a0, main
87	/* Let the libc call main and exit with its return code.  */
88	jsri	__libc_start_main
89
90	/* Should never get here.  */
91	jsri	abort
92#endif	/* !SHARED */
93	cfi_endproc
94	.size _start,.-_start
95
96
97	/* Define a symbol for the first piece of initialized data.  */
98	.data
99	.globl __data_start
100__data_start:
101	.long 0
102	.weak data_start
103	data_start = __data_start
104