libc
/* $Id$ */
/* Copyright (c) 2007-2016 Pierre Pronchery <khorben@defora.org> */
/* This file is part of DeforaOS System libc */
/* All rights reserved.
*
* 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 COPYRIGHT HOLDERS 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 COPYRIGHT
* HOLDER 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. */
_start:
/* terminate stack */
mov %g0, %fp
/* argc, argv, arge, environ */
/* %sp is 0xefffec48, argc is 0xefffec88, argv is 0xefffed3c */
ld [%sp+0x40], %o0 /* argc */
add %sp, 0x44, %o1 /* argv */
add %o0, %o1, %o2 /* arge = 4 * (argv + argc + 1) */
add %o0, %o2, %o2
add %o0, %o2, %o2
add %o0, %o2, %o2
add %o2, 0x4, %o2
set environ, %o3 /* %o3 = &environ */
st %o2, [%o3] /* *environ = %o2 */
/* initialize stdio */
call __start_stdio
nop
/* main */
call main
nop
/* exit */
call exit
mov %i0, %o0
/* crash */
ret
nop
/* other essential functions */
/* udiv */
.global .udiv
.udiv:
retl
udivcc %o0, %o1, %o0
/* umul */
.global .umul
.umul:
retl
umulcc %o0, %o1, %o0
/* urem */
.global .urem
.urem:
udivcc %o0, %o1, %o2 /* c = a / b */
umulcc %o1, %o2, %o1 /* b = b * c */
retl
subcc %o0, %o1, %o0 /* a = a - b */