source: trunk/libs/newlib/src/libgloss/lm32/crt0.S @ 592

Last change on this file since 592 was 444, checked in by satin@…, 6 years ago

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

File size: 2.3 KB
Line 
1/*
2 * Lattice Mico32 C startup code.
3 * Contributed by Jon Beniston <jon@beniston.com>
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27        .section    .boot, "ax", @progbits
28
29        /* Program starts here */
30       
31        .global     _start 
32_start:
33
34        /* Setup stack and global pointer */
35        mvhi    sp, hi(_fstack)
36        ori     sp, sp, lo(_fstack)
37        mvhi    gp, hi(_gp)
38        ori     gp, gp, lo(_gp)
39                               
40        /* Clear BSS */
41        mvhi    r1, hi(_fbss)
42        ori     r1, r1, lo(_fbss)
43        mvi     r2, 0
44        mvhi    r3, hi(_ebss)
45        ori     r3, r3, lo(_ebss)
46        sub     r3, r3, r1
47        calli   memset
48       
49        /* Call C++ constructors */
50        calli   _init
51       
52        /* Call C++ destructors on exit */
53        mvhi    r1, hi(_fini)
54        ori     r1, r1, lo(_fini)
55        calli   atexit
56                                           
57        /* Call main program */
58        mvi     r1, 0
59        mvi     r2, 0
60        mvi     r3, 0
61        calli   main
62       
63        /* Call exit, which doesn't return, to perform any clean up */
64        calli   exit       
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