89 lines
2.7 KiB
ArmAsm
89 lines
2.7 KiB
ArmAsm
/* crt0.S for the Visium processor.
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Copyright (c) 2015 Rolls-Royce Controls and Data Services Limited.
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All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are met:
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* Redistributions of source code must retain the above copyright notice,
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this list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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* Neither the name of Rolls-Royce Controls and Data Services Limited nor
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the names of its contributors may be used to endorse or promote products
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derived from this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
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THE POSSIBILITY OF SUCH DAMAGE. */
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.weak _get_cmdline
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.text
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.align 4
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.global __start
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__start:
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/* Initialize the stack pointer. */
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moviu r1,%u _estack
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movil r1,%l _estack
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move.l r23,r1
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/* Terminate the frame chain. */
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moviq r22,0
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/* Zero the .bss segment. */
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moviu r1,%u __bss_start
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movil r1,%l __bss_start
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moviu r2,%u __bss_end
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movil r2,%l __bss_end
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.L0:
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cmp.l r1,r1
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brr eq,.L1
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nop
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write.b (r1),r0
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brr tr,.L0
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addi r1,1
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.L1:
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/* Register __fini (destructors) with atexit. */
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moviu r1,%u __fini
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moviu r2,%u atexit
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movil r2,%l atexit
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bra tr,r2,r21
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movil r1,%l __fini
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/* Call __init (constructors). */
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moviu r1,%u __init
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movil r1,%l __init
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bra tr,r1,r21
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nop
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/* Set up argc and argv. */
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moviu r3,%u _get_cmdline
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movil r3,%l _get_cmdline
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cmp.l r3,r0
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moviq r1,0
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bra ne,r3,r21
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moviq r2,0
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/* Call the main program. */
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moviu r3,%u main
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movil r3,%l main
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bra tr,r3,r21
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nop
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/* Call exit in case the main program didn't. */
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moviu r2,%u exit
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movil r2,%l exit
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bra tr,r2,r21
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nop
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.end
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