1/* Startup code for programs linked with GNU libc.
2   Copyright (C) 1998-2021 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#include <sysdep.h>
37
38/* We do not want .eh_frame info for crt1.o since crt1.o is linked
39   before crtbegin.o, the file defining __EH_FRAME_BEGIN__.  */
40#undef cfi_startproc
41#define cfi_startproc
42#undef cfi_endproc
43#define cfi_endproc
44
45 /* These are the various addresses we require.  */
46#ifdef PIC
47	.section ".data"
48#else
49	.section ".rodata"
50#endif
51	.align	2
52L(start_addresses):
53	.long	_SDA_BASE_
54	.long	main
55	.long 	0 /* Used to be init.  */
56	.long 	0 /* Used to be fini.  */
57	ASM_SIZE_DIRECTIVE(L(start_addresses))
58
59	.section ".text"
60ENTRY(_start)
61 /* Save the stack pointer, in case we're statically linked under Linux.  */
62	mr	r9,r1
63 /* Set up an initial stack frame, and clear the LR.  */
64	clrrwi	r1,r1,4
65#ifdef PIC
66	SETUP_GOT_ACCESS(r13,got_label)
67	li	r0,0
68#else
69	li	r0,0
70#endif
71	stwu	r1,-16(r1)
72	mtlr	r0
73	stw	r0,0(r1)
74 /* Set r13 to point at the 'small data area', and put the address of
75    start_addresses in r8.  Also load the GOT pointer so that new PLT
76    calls work, like the one to __libc_start_main.  */
77#ifdef PIC
78	addis	r30,r13,_GLOBAL_OFFSET_TABLE_-got_label@ha
79	addis	r8,r13,L(start_addresses)-got_label@ha
80	addi	r30,r30,_GLOBAL_OFFSET_TABLE_-got_label@l
81	lwzu	r13, L(start_addresses)-got_label@l(r8)
82#else
83	lis	r8,L(start_addresses)@ha
84	lwzu	r13,L(start_addresses)@l(r8)
85#endif
86 /* and continue in libc-start, in glibc.  */
87	b	JUMPTARGET(__libc_start_main)
88END(_start)
89
90/* Define a symbol for the first piece of initialized data.  */
91	.section ".data"
92	.globl	__data_start
93__data_start:
94	.long	0
95weak_alias (__data_start, data_start)
96