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jeremybenn |
/*
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(C) Copyright IBM Corp. 2005, 2006
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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 IBM nor the names of its contributors may be
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used to endorse or promote products derived from this software without
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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 THE
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POSSIBILITY OF SUCH DAMAGE.
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Author: Andreas Neukoetter (ti95neuk@de.ibm.com)
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*/
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#include <sys/types.h>
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#include <errno.h>
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#include <spu_intrinsics.h>
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extern caddr_t _end;
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#define STACKSIZE 4096
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void *
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sbrk (ptrdiff_t increment)
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{
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static caddr_t heap_ptr = NULL;
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caddr_t base;
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vector unsigned int sp_reg, sp_delta;
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vector unsigned int *sp_ptr;
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caddr_t sps;
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/* The stack pointer register. */
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volatile register vector unsigned int sp_r1 __asm__("1");
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if (heap_ptr == NULL)
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heap_ptr = (caddr_t) & _end;
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sps = (caddr_t) spu_extract (sp_r1, 0);
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if (((int) sps - STACKSIZE - (int) heap_ptr) >= increment)
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{
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base = heap_ptr;
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heap_ptr += increment;
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sp_delta = (vector unsigned int) spu_insert (increment, spu_splats (0), 1);
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/* Subtract sp_delta from the SP limit (word 1). */
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sp_r1 = spu_sub (sp_r1, sp_delta);
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/* Fix-up backchain. */
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sp_ptr = (vector unsigned int *) spu_extract (sp_r1, 0);
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do
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{
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sp_reg = *sp_ptr;
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*sp_ptr = (vector unsigned int) spu_sub (sp_reg, sp_delta);
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}
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while ((sp_ptr = (vector unsigned int *) spu_extract (sp_reg, 0)));
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return (base);
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}
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else
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{
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errno = ENOMEM;
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return ((void *) -1);
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}
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}
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