1//===-- mem_map_fuchsia.h ---------------------------------------*- C++ -*-===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8
9#ifndef SCUDO_MEM_MAP_FUCHSIA_H_
10#define SCUDO_MEM_MAP_FUCHSIA_H_
11
12#include "mem_map_base.h"
13
14#if SCUDO_FUCHSIA
15
16#include <stdint.h>
17#include <zircon/types.h>
18
19namespace scudo {
20
21class MemMapFuchsia final : public MemMapBase<MemMapFuchsia> {
22public:
23 constexpr MemMapFuchsia() = default;
24
25 // Impls for base functions.
26 bool mapImpl(uptr Addr, uptr Size, const char *Name, uptr Flags);
27 void unmapImpl(uptr Addr, uptr Size);
28 bool remapImpl(uptr Addr, uptr Size, const char *Name, uptr Flags);
29 void setMemoryPermissionImpl(uptr Addr, uptr Size, uptr Flags);
30 void releasePagesToOSImpl(uptr From, uptr Size) {
31 return releaseAndZeroPagesToOSImpl(From, Size);
32 }
33 void releaseAndZeroPagesToOSImpl(uptr From, uptr Size);
34 uptr getBaseImpl() { return WindowBase; }
35 uptr getCapacityImpl() { return WindowSize; }
36
37private:
38 friend class ReservedMemoryFuchsia;
39
40 // Used by ReservedMemoryFuchsia::dispatch.
41 MemMapFuchsia(uptr Base, uptr Capacity);
42
43 // Virtual memory address corresponding to VMO offset 0.
44 uptr MapAddr = 0;
45
46 // Virtual memory base address and size of the VMO subrange that is still in
47 // use. unmapImpl() can shrink this range, either at the beginning or at the
48 // end.
49 uptr WindowBase = 0;
50 uptr WindowSize = 0;
51
52 zx_handle_t Vmo = ZX_HANDLE_INVALID;
53};
54
55class ReservedMemoryFuchsia final
56 : public ReservedMemory<ReservedMemoryFuchsia, MemMapFuchsia> {
57public:
58 constexpr ReservedMemoryFuchsia() = default;
59
60 bool createImpl(uptr Addr, uptr Size, const char *Name, uptr Flags);
61 void releaseImpl();
62 MemMapT dispatchImpl(uptr Addr, uptr Size);
63 uptr getBaseImpl() { return Base; }
64 uptr getCapacityImpl() { return Capacity; }
65
66private:
67 uptr Base = 0;
68 uptr Capacity = 0;
69};
70
71} // namespace scudo
72
73#endif // SCUDO_FUCHSIA
74
75#endif // SCUDO_MEM_MAP_FUCHSIA_H_
76