| 1 |
148 |
jeremybenn |
/*
|
| 2 |
|
|
* Lattice Mico32 C startup code.
|
| 3 |
|
|
* Contributed by Jon Beniston
|
| 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
|
