1// Copyright (c) 2019, the Dart project authors. Please see the AUTHORS file
2// for details. All rights reserved. Use of this source code is governed by a
3// BSD-style license that can be found in the LICENSE file.
4
5#ifndef RUNTIME_VM_BSS_RELOCS_H_
6#define RUNTIME_VM_BSS_RELOCS_H_
7
8#include "platform/allocation.h"
9
10namespace dart {
11class Thread;
12
13class BSS : public AllStatic {
14 public:
15 // Entries found in both the VM and isolate BSS come first. Each has its own
16 // portion of the BSS segment, so just the indices are shared, not the values
17 // stored at the index.
18 enum class Relocation : intptr_t {
19 InstructionsRelocatedAddress,
20 // End of shared entries.
21 DRT_GetThreadForNativeCallback,
22 // End of isolate-only entries.
23 };
24
25 static constexpr intptr_t kVmEntryCount =
26 static_cast<intptr_t>(Relocation::InstructionsRelocatedAddress) + 1;
27
28 static constexpr intptr_t kIsolateEntryCount =
29 static_cast<intptr_t>(Relocation::DRT_GetThreadForNativeCallback) + 1;
30
31 static constexpr intptr_t RelocationIndex(Relocation reloc) {
32 return static_cast<intptr_t>(reloc);
33 }
34
35 static void Initialize(Thread* current, uword* bss, bool vm);
36
37 // Currently only used externally by LoadedElf::ResolveSymbols() to set the
38 // relocated address without changing the embedder interface.
39 static void InitializeBSSEntry(BSS::Relocation relocation,
40 uword new_value,
41 uword* bss_start);
42};
43
44} // namespace dart
45
46#endif // RUNTIME_VM_BSS_RELOCS_H_
47