1/* Startup code compliant to the ELF C-SKY ABIV2.
2 Copyright (C) 2018-2026 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