1//===-- EmulateInstructionRISCV.h -----------------------------------------===//
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 LLDB_SOURCE_PLUGINS_INSTRUCTION_RISCV_EMULATEINSTRUCTIONRISCV_H
10#define LLDB_SOURCE_PLUGINS_INSTRUCTION_RISCV_EMULATEINSTRUCTIONRISCV_H
11
12#include "RISCVInstructions.h"
13
14#include "lldb/Core/EmulateInstruction.h"
15#include "lldb/Interpreter/OptionValue.h"
16#include "lldb/Utility/Log.h"
17#include "lldb/Utility/RegisterValue.h"
18#include "lldb/Utility/Status.h"
19#include <optional>
20
21namespace lldb_private {
22
23class EmulateInstructionRISCV : public EmulateInstruction {
24public:
25 static llvm::StringRef GetPluginNameStatic() { return "riscv"; }
26
27 static llvm::StringRef GetPluginDescriptionStatic() {
28 return "Emulate instructions for the RISC-V architecture.";
29 }
30
31 static bool SupportsThisInstructionType(InstructionType inst_type) {
32 switch (inst_type) {
33 case eInstructionTypeAny:
34 case eInstructionTypePCModifying:
35 return true;
36 case eInstructionTypePrologueEpilogue:
37 case eInstructionTypeAll:
38 return false;
39 }
40 llvm_unreachable("Fully covered switch above!");
41 }
42
43 static bool SupportsThisArch(const ArchSpec &arch);
44
45 static lldb_private::EmulateInstruction *
46 CreateInstance(const lldb_private::ArchSpec &arch, InstructionType inst_type);
47
48 static void Initialize();
49
50 static void Terminate();
51
52public:
53 EmulateInstructionRISCV(const ArchSpec &arch) : EmulateInstruction(arch) {}
54
55 llvm::StringRef GetPluginName() override { return GetPluginNameStatic(); }
56
57 bool SupportsEmulatingInstructionsOfType(InstructionType inst_type) override {
58 return SupportsThisInstructionType(inst_type);
59 }
60
61 bool SetTargetTriple(const ArchSpec &arch) override;
62 bool ReadInstruction() override;
63 bool EvaluateInstruction(uint32_t options) override;
64 bool TestEmulation(Stream &out_stream, ArchSpec &arch,
65 OptionValueDictionary *test_data) override;
66 std::optional<RegisterInfo> GetRegisterInfo(lldb::RegisterKind reg_kind,
67 uint32_t reg_num) override;
68
69 std::optional<lldb::addr_t> ReadPC();
70 bool WritePC(lldb::addr_t pc);
71
72 std::optional<DecodeResult> ReadInstructionAt(lldb::addr_t addr);
73 std::optional<DecodeResult> Decode(uint32_t inst);
74 bool Execute(DecodeResult inst, bool ignore_cond);
75
76 template <typename T>
77 std::enable_if_t<std::is_integral_v<T>, std::optional<T>>
78 ReadMem(uint64_t addr) {
79 EmulateInstructionRISCV::Context ctx;
80 ctx.type = EmulateInstruction::eContextRegisterLoad;
81 ctx.SetNoArgs();
82 bool success = false;
83 T result = ReadMemoryUnsigned(context: ctx, addr, byte_size: sizeof(T), fail_value: T(), success_ptr: &success);
84 if (!success)
85 return {}; // aka return false
86 return result;
87 }
88
89 template <typename T> bool WriteMem(uint64_t addr, uint64_t value) {
90 EmulateInstructionRISCV::Context ctx;
91 ctx.type = EmulateInstruction::eContextRegisterStore;
92 ctx.SetNoArgs();
93 return WriteMemoryUnsigned(context: ctx, addr, uval: value, uval_byte_size: sizeof(T));
94 }
95
96 llvm::RoundingMode GetRoundingMode();
97 bool SetAccruedExceptions(llvm::APFloatBase::opStatus);
98
99private:
100 /// Last decoded instruction from m_opcode
101 DecodeResult m_decoded;
102};
103
104} // namespace lldb_private
105
106#endif // LLDB_SOURCE_PLUGINS_INSTRUCTION_RISCV_EMULATEINSTRUCTIONRISCV_H
107

source code of lldb/source/Plugins/Instruction/RISCV/EmulateInstructionRISCV.h