1/* Startup code for elf64-sparc
2   Copyright (C) 1997-2017 Free Software Foundation, Inc.
3   Contributed by Richard Henderson <richard@gnu.ai.mit.edu>, 1997.
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   <http://www.gnu.org/licenses/>.  */
35
36#include <features.h>
37#include <sysdep.h>
38
39.text
40.align 4
41.global _start
42.type   _start,%function
43#if defined(__UCLIBC_CTOR_DTOR__)
44.type   _init,%function
45.type   _fini,%function
46#else
47.weak   _init
48.weak   _fini
49#endif
50.type   __uClibc_main,%function
51/* Stick in a dummy reference to main(), so that if an application
52 * is linking when the main() function is in a static library (.a)
53 * we can be sure that main() actually gets linked in */
54.global main
55.type   main,%function
56
57#ifdef __PIC__
58.LLGETPC0:
59	retl
60	add	%o7, %l7, %l7
61#endif
62
63_start:
64#ifdef __PIC__
65	sethi	%hi(_GLOBAL_OFFSET_TABLE_-4), %l7
66	call	.LLGETPC0
67	add	%l7, %lo(_GLOBAL_OFFSET_TABLE_+4), %l7
68#endif
69
70	/* Terminate the stack frame, and reserve space for functions to
71	 * drop their arguments.  */
72	mov	%g0, %fp
73	sub	%sp, 6*8, %sp
74
75  	/* Extract the arguments and environment as encoded on the stack.  The
76    	 argument info starts after one register window (16 words) past the SP,
77    	 plus the bias we added, plus the magic v9 STACK_BIAS.  */
78	ldx	[%sp+STACK_BIAS+22*8], %o1   /* %o1 = argc */
79	add	%sp, STACK_BIAS+23*8, %o2    /* %o2 = argv */
80
81	/* Load the addresses of the user entry points.  */
82	sethi	%hi(main), %o0
83	sethi	%hi(_init), %o3
84	sethi	%hi(_fini), %o4
85	or	%o0, %lo(main), %o0
86	or	%o3, %lo(_init), %o3
87	or	%o4, %lo(_fini), %o4
88#ifdef __PIC__
89	/* Need a little more magic when building PIC to get addr of main */
90	LD	[%l7 + %o0], %o0
91	LD	[%l7 + %o3], %o3
92	LD	[%l7 + %o4], %o4
93#endif
94
95	/* When starting a binary via the dynamic linker, %g1 contains the
96	 * address of the shared library termination function, which will be
97	 * registered with atexit().  If we are statically linked, this will
98	 * be NULL.  */
99	mov	%g1, %o5
100
101	/* Let libc do the rest of the initialization, and call main.  */
102	call __uClibc_main
103	nop
104
105	/* Die very horribly if exit returns.  */
106	unimp
107
108.size _start,.-_start
109
110/* Define a symbol for the first piece of initialized data. */
111.data
112.global __data_start
113__data_start:
114.long 0
115.weak data_start
116	data_start = __data_start
117