1/* ld.so _start code.
2   Copyright (C) 2022 Free Software Foundation, Inc.
3
4   This file is part of the GNU C Library.
5
6   The GNU C Library is free software; you can redistribute it and/or
7   modify it under the terms of the GNU Lesser General Public
8   License as published by the Free Software Foundation; either
9   version 2.1 of the License, or (at your option) any later version.
10
11   The GNU C Library is distributed in the hope that it will be useful,
12   but WITHOUT ANY WARRANTY; without even the implied warranty of
13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
14   Lesser General Public License for more details.
15
16   You should have received a copy of the GNU Lesser General Public
17   License along with the GNU C Library; if not, see
18   <https://www.gnu.org/licenses/>.  */
19
20#include <sysdep.h>
21
22ENTRY (_start)
23	/* Create an initial frame with 0 LR and FP */
24	cfi_undefined (x30)
25	mov	x29, #0
26	mov	x30, #0
27
28	mov	x0, sp
29	PTR_ARG (0)
30	bl	_dl_start
31	/* Returns user entry point in x0.  */
32	mov	PTR_REG (21), PTR_REG (0)
33.globl _dl_start_user
34.type _dl_start_user, %function
35_dl_start_user:
36	/* Get argc.  */
37	ldr	PTR_REG (1), [sp]
38	/* Get argv.  */
39	add	x2, sp, PTR_SIZE
40	/* Compute envp.  */
41	add	PTR_REG (3), PTR_REG (2), PTR_REG (1), lsl PTR_LOG_SIZE
42	add	PTR_REG (3), PTR_REG (3), PTR_SIZE
43	adrp	x16, _rtld_local
44	add	PTR_REG (16), PTR_REG (16), :lo12:_rtld_local
45	ldr	PTR_REG (0), [x16]
46	bl	_dl_init
47	/* Load the finalizer function.  */
48	adrp	x0, _dl_fini
49	add	PTR_REG (0), PTR_REG (0), :lo12:_dl_fini
50	/* Jump to the user's entry point.  */
51	mov     x16, x21
52	br      x16
53END (_start)
54