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/* crt0.S for the Visium processor.
Copyright (c) 2015 Rolls-Royce Controls and Data Services Limited.
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
* Redistributions of source code must retain the above copyright notice,
this list of conditions and the following disclaimer.
* 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.
* Neither the name of Rolls-Royce Controls and Data Services Limited nor
the names of its contributors may be used to endorse or promote products
derived from this software without specific prior written permission.
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 OWNER 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. */
.weak _get_cmdline
.text
.align 4
.global __start
__start:
/* Initialize the stack pointer. */
moviu r1,%u _estack
movil r1,%l _estack
move.l r23,r1
/* Terminate the frame chain. */
moviq r22,0
/* Zero the .bss segment. */
moviu r1,%u __bss_start
movil r1,%l __bss_start
moviu r2,%u __bss_end
movil r2,%l __bss_end
.L0:
cmp.l r1,r1
brr eq,.L1
nop
write.b (r1),r0
brr tr,.L0
addi r1,1
.L1:
/* Register __fini (destructors) with atexit. */
moviu r1,%u __fini
moviu r2,%u atexit
movil r2,%l atexit
bra tr,r2,r21
movil r1,%l __fini
/* Call __init (constructors). */
moviu r1,%u __init
movil r1,%l __init
bra tr,r1,r21
nop
/* Set up argc and argv. */
moviu r3,%u _get_cmdline
movil r3,%l _get_cmdline
cmp.l r3,r0
moviq r1,0
bra ne,r3,r21
moviq r2,0
/* Call the main program. */
moviu r3,%u main
movil r3,%l main
bra tr,r3,r21
nop
/* Call exit in case the main program didn't. */
moviu r2,%u exit
movil r2,%l exit
bra tr,r2,r21
nop
.end
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