source: trunk/libs/newlib/src/libgloss/sparc_leon/crt0.S @ 546

Last change on this file since 546 was 444, checked in by satin@…, 6 years ago

add newlib,libalmos-mkh, restructure shared_syscalls.h and mini-libc

File size: 2.1 KB
Line 
1/*
2 * Copyright (c) 2011 Aeroflex Gaisler
3 *
4 * BSD license:
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a copy
7 * of this software and associated documentation files (the "Software"), to deal
8 * in the Software without restriction, including without limitation the rights
9 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
10 * copies of the Software, and to permit persons to whom the Software is
11 * furnished to do so, subject to the following conditions:
12 *
13 * The above copyright notice and this permission notice shall be included in
14 * all copies or substantial portions of the Software.
15 *
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
22 * THE SOFTWARE.
23 */
24
25
26        .text
27        .global _start, main, _end
28
29_start:
30
31#ifndef _FLAT
32        save    %sp, -64, %sp
33#else
34        add     %sp, -72, %sp
35        st      %o7, [%sp+64]
36#endif
37        /* clear the bss */
38 
39        sethi %hi(__bss_start),%g2
40        or    %g2,%lo(__bss_start),%g2  ! g2 = start of bss
41        sethi %hi(_end),%g3
42        or    %g3,%lo(_end),%g3         ! g3 = end of bss
43        mov   %g0,%g1                   ! so std has two zeros
44        sub   %g3, %g2, %g3
45zerobss:
46        subcc  %g3, 8, %g3
47        bge,a   zerobss
48        std    %g0,[%g2+%g3]
49
50        set    _end, %o0
51        st     %g0,[%o0]
52
53        call    bdinit2
54         nop
55
56        call    prelibchook
57         nop
58
59        call    _call_initcalls        /* atexit uses __atexit lock */
60         nop
61       
62        set     _fini, %o0
63        call    atexit, 1
64         nop
65       
66        call    _init
67         nop
68       
69        call    main
70         nop
71        call _exit
72        nop
73#ifndef _FLAT
74        ret
75        restore
76#else
77        ld      [%sp+64], %o7
78        retl
79        add     %sp, 72, %sp
80#endif
81
82        .seg    "data"
83        .global .bdata
84.bdata:
85        .align  8
86        .global _environ
87_environ:
88        .word   1
89 
90
91
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