source: trunk/libs/newlib/src/libgloss/visium/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: 2.7 KB
Line 
1/* crt0.S for the Visium processor.
2
3   Copyright (c) 2015 Rolls-Royce Controls and Data Services Limited.
4   All rights reserved.
5
6   Redistribution and use in source and binary forms, with or without
7   modification, are permitted provided that the following conditions are met:
8
9     * Redistributions of source code must retain the above copyright notice,
10       this list of conditions and the following disclaimer.
11     * Redistributions in binary form must reproduce the above copyright
12       notice, this list of conditions and the following disclaimer in the
13       documentation and/or other materials provided with the distribution.
14     * Neither the name of Rolls-Royce Controls and Data Services Limited nor
15       the names of its contributors may be used to endorse or promote products
16       derived from this software without specific prior written permission.
17
18   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
19   AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20   IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21   ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
22   LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
23   CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
24   SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
25   INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
26   CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
27   ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
28   THE POSSIBILITY OF SUCH DAMAGE.  */
29
30        .weak _get_cmdline
31        .text
32        .align  4
33        .global __start
34__start:
35        /* Initialize the stack pointer.  */
36        moviu   r1,%u _estack
37        movil   r1,%l _estack
38        move.l  r23,r1
39
40        /* Terminate the frame chain.  */
41        moviq   r22,0
42
43        /* Zero the .bss segment.  */
44        moviu   r1,%u __bss_start
45        movil   r1,%l __bss_start
46        moviu   r2,%u __bss_end
47        movil   r2,%l __bss_end
48.L0:
49        cmp.l   r1,r1
50        brr     eq,.L1
51         nop
52        write.b (r1),r0
53        brr     tr,.L0
54         addi   r1,1
55.L1:
56        /* Register __fini (destructors) with atexit.  */
57        moviu   r1,%u __fini
58        moviu   r2,%u atexit
59        movil   r2,%l atexit
60        bra     tr,r2,r21
61         movil  r1,%l __fini
62
63        /* Call __init (constructors).  */
64        moviu   r1,%u __init
65        movil   r1,%l __init
66        bra     tr,r1,r21
67         nop
68
69        /* Set up argc and argv.  */
70        moviu   r3,%u _get_cmdline
71        movil   r3,%l _get_cmdline
72        cmp.l   r3,r0
73        moviq   r1,0
74        bra     ne,r3,r21
75         moviq  r2,0
76
77        /* Call the main program.  */
78        moviu   r3,%u main
79        movil   r3,%l main
80        bra     tr,r3,r21
81         nop
82
83        /* Call exit in case the main program didn't.  */
84        moviu   r2,%u exit
85        movil   r2,%l exit
86        bra     tr,r2,r21
87         nop
88        .end
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