/* | |
* Lattice Mico32 C startup code. | |
* Contributed by Jon Beniston <jon@beniston.com> | |
* | |
* Redistribution and use in source and binary forms, with or without | |
* modification, are permitted provided that the following conditions | |
* are met: | |
* 1. Redistributions of source code must retain the above copyright | |
* notice, this list of conditions and the following disclaimer. | |
* 2. Redistributions in binary form must reproduce the above copyright | |
* notice, this list of conditions and the following disclaimer in the | |
* documentation and/or other materials provided with the distribution. | |
* | |
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND | |
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE | |
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
* SUCH DAMAGE. | |
*/ | |
.section .boot, "ax", @progbits | |
/* Program starts here */ | |
.global _start | |
_start: | |
/* Setup stack and global pointer */ | |
mvhi sp, hi(_fstack) | |
ori sp, sp, lo(_fstack) | |
mvhi gp, hi(_gp) | |
ori gp, gp, lo(_gp) | |
/* Clear BSS */ | |
mvhi r1, hi(_fbss) | |
ori r1, r1, lo(_fbss) | |
mvi r2, 0 | |
mvhi r3, hi(_ebss) | |
ori r3, r3, lo(_ebss) | |
sub r3, r3, r1 | |
calli memset | |
/* Call C++ constructors */ | |
calli _init | |
/* Call C++ destructors on exit */ | |
mvhi r1, hi(_fini) | |
ori r1, r1, lo(_fini) | |
calli atexit | |
/* Call main program */ | |
mvi r1, 0 | |
mvi r2, 0 | |
mvi r3, 0 | |
calli main | |
/* Call exit, which doesn't return, to perform any clean up */ | |
calli exit |