4fea7b8bb1
The PAL API previously allowed for returning more memory than asked for. This was when the PAL performed the alignment work, now this is done in large alloc, so removing from the PAL.
62 lines
1.4 KiB
C++
62 lines
1.4 KiB
C++
#pragma once
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#include "pal_plain.h"
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#ifdef OPEN_ENCLAVE
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extern "C" const void* __oe_get_heap_base();
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extern "C" const void* __oe_get_heap_end();
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extern "C" void* oe_memset(void* p, int c, size_t size);
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extern "C" void oe_abort();
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namespace snmalloc
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{
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class PALOpenEnclave
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{
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std::atomic<void*> oe_base;
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public:
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/**
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* Bitmap of PalFeatures flags indicating the optional features that this
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* PAL supports.
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*/
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static constexpr uint64_t pal_features = 0;
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static void error(const char* const str)
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{
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UNUSED(str);
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oe_abort();
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}
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template<bool committed>
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void* reserve(size_t size) noexcept
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{
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if (oe_base == 0)
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{
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void* dummy = NULL;
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oe_base.compare_exchange_strong(
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dummy, const_cast<void*>(__oe_get_heap_base()));
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}
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void* old_base = oe_base;
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void* next_base;
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auto end = __oe_get_heap_end();
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do
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{
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auto new_base = old_base;
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next_base = pointer_offset(new_base, size);
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if (next_base > end)
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error("Out of memory");
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} while (oe_base.compare_exchange_strong(old_base, next_base));
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return old_base;
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}
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template<bool page_aligned = false>
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void zero(void* p, size_t size) noexcept
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{
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oe_memset(p, 0, size);
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}
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};
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}
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#endif
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