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9441de4c38
This release is used in conjunction with the linux-sgx-driver Intial release: https://github.com/01org/linux-sgx-driver commit-id: 0e865ce5e6b297a787bcdc12d98bada8174be6d7 Intel-id: 33399 Signed-off-by: Angie Chinchilla <angie.v.chinchilla@intel.com>
76 lines
2.5 KiB
C
76 lines
2.5 KiB
C
/*
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* Copyright (C) 2011-2016 Intel Corporation. All rights reserved.
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*
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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
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* are met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, 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
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* the documentation and/or other materials provided with the
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* distribution.
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* * Neither the name of Intel Corporation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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*/
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#include <stddef.h>
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#include <unistd.h>
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#include "trts_util.h"
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SE_DECLSPEC_EXPORT size_t g_peak_heap_used = 0;
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/* Please be aware of: sbrk is not thread safe by default. */
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void* sbrk(intptr_t n)
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{
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static size_t heap_used;
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void *heap_ptr = NULL;
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void *heap_base = get_heap_base();
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size_t heap_size = get_heap_size();
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if (!heap_base)
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return (void *)(~(size_t)0);
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/* shrink the heap */
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if (n < 0) {
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if (heap_used <= INTPTR_MAX && ((intptr_t)heap_used + n) < 0)
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return (void *)(~(size_t)0);
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heap_used += n;
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heap_ptr = (void *)((size_t)heap_base + (size_t)heap_used);
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return heap_ptr;
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}
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/* extend the heap */
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if ((heap_used + n) > heap_size)
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return (void *)(~(size_t)0);
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heap_ptr = (void *)((size_t)heap_base + (size_t)heap_used);
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heap_used += n;
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/* update g_peak_heap_used */
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g_peak_heap_used = (g_peak_heap_used < heap_used) ? heap_used : g_peak_heap_used;
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return heap_ptr;
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}
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