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//===-- EmulateInstructionARM64.h -------------------------------*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#ifndef LLDB_SOURCE_PLUGINS_INSTRUCTION_ARM64_EMULATEINSTRUCTIONARM64_H
#define LLDB_SOURCE_PLUGINS_INSTRUCTION_ARM64_EMULATEINSTRUCTIONARM64_H
#include "Plugins/Process/Utility/ARMDefines.h"
#include "lldb/Core/EmulateInstruction.h"
#include "lldb/Interpreter/OptionValue.h"
#include "lldb/Utility/Status.h"
#include <optional>
class EmulateInstructionARM64 : public lldb_private::EmulateInstruction {
public:
EmulateInstructionARM64(const lldb_private::ArchSpec &arch)
: EmulateInstruction(arch), m_opcode_pstate(), m_emulated_pstate(),
m_ignore_conditions(false) {}
static void Initialize();
static void Terminate();
static llvm::StringRef GetPluginNameStatic() { return "arm64"; }
static llvm::StringRef GetPluginDescriptionStatic();
static lldb_private::EmulateInstruction *
CreateInstance(const lldb_private::ArchSpec &arch,
lldb_private::InstructionType inst_type);
static bool SupportsEmulatingInstructionsOfTypeStatic(
lldb_private::InstructionType inst_type) {
switch (inst_type) {
case lldb_private::eInstructionTypeAny:
case lldb_private::eInstructionTypePrologueEpilogue:
return true;
case lldb_private::eInstructionTypePCModifying:
case lldb_private::eInstructionTypeAll:
return false;
}
return false;
}
llvm::StringRef GetPluginName() override { return GetPluginNameStatic(); }
bool SetTargetTriple(const lldb_private::ArchSpec &arch) override;
bool SupportsEmulatingInstructionsOfType(
lldb_private::InstructionType inst_type) override {
return SupportsEmulatingInstructionsOfTypeStatic(inst_type);
}
bool ReadInstruction() override;
bool EvaluateInstruction(uint32_t evaluate_options) override;
bool TestEmulation(lldb_private::Stream &out_stream,
lldb_private::ArchSpec &arch,
lldb_private::OptionValueDictionary *test_data) override {
return false;
}
std::optional<lldb_private::RegisterInfo>
GetRegisterInfo(lldb::RegisterKind reg_kind, uint32_t reg_num) override;
bool
CreateFunctionEntryUnwind(lldb_private::UnwindPlan &unwind_plan) override;
enum AddrMode { AddrMode_OFF, AddrMode_PRE, AddrMode_POST };
enum BranchType {
BranchType_CALL,
BranchType_ERET,
BranchType_DRET,
BranchType_RET,
BranchType_JMP
};
enum CountOp { CountOp_CLZ, CountOp_CLS, CountOp_CNT };
enum RevOp { RevOp_RBIT, RevOp_REV16, RevOp_REV32, RevOp_REV64 };
enum BitwiseOp { BitwiseOp_NOT, BitwiseOp_RBIT };
enum ExceptionLevel { EL0 = 0, EL1 = 1, EL2 = 2, EL3 = 3 };
enum ExtendType {
ExtendType_SXTB,
ExtendType_SXTH,
ExtendType_SXTW,
ExtendType_SXTX,
ExtendType_UXTB,
ExtendType_UXTH,
ExtendType_UXTW,
ExtendType_UXTX
};
enum ExtractType { ExtractType_LEFT, ExtractType_RIGHT };
enum LogicalOp { LogicalOp_AND, LogicalOp_EOR, LogicalOp_ORR };
enum MemOp { MemOp_LOAD, MemOp_STORE, MemOp_PREFETCH, MemOp_NOP };
enum MoveWideOp { MoveWideOp_N, MoveWideOp_Z, MoveWideOp_K };
enum ShiftType { ShiftType_LSL, ShiftType_LSR, ShiftType_ASR, ShiftType_ROR };
enum StackPointerSelection { SP0 = 0, SPx = 1 };
enum Unpredictable { Unpredictable_WBOVERLAP, Unpredictable_LDPOVERLAP };
enum ConstraintType {
Constraint_NONE,
Constraint_UNKNOWN,
Constraint_SUPPRESSWB,
Constraint_NOP
};
enum AccType {
AccType_NORMAL,
AccType_UNPRIV,
AccType_STREAM,
AccType_ALIGNED,
AccType_ORDERED
};
typedef struct {
uint32_t N : 1, V : 1, C : 1,
Z : 1, // condition code flags – can also be accessed as
// PSTATE.[N,Z,C,V]
Q : 1, // AArch32 only – CSPR.Q bit
IT : 8, // AArch32 only – CPSR.IT bits
J : 1, // AArch32 only – CSPR.J bit
T : 1, // AArch32 only – CPSR.T bit
SS : 1, // Single step process state bit
IL : 1, // Illegal state bit
D : 1, A : 1, I : 1,
F : 1, // Interrupt masks – can also be accessed as PSTATE.[D,A,I,F]
E : 1, // AArch32 only – CSPR.E bit
M : 5, // AArch32 only – mode encodings
RW : 1, // Current register width – 0 is AArch64, 1 is AArch32
EL : 2, // Current exception level (see ExceptionLevel enum)
SP : 1; // AArch64 only - Stack Pointer selection (see
// StackPointerSelection enum)
} ProcState;
protected:
static uint64_t AddWithCarry(uint32_t N, uint64_t x, uint64_t y, bool carry_in,
EmulateInstructionARM64::ProcState &proc_state);
typedef struct {
uint32_t mask;
uint32_t value;
uint32_t vfp_variants;
bool (EmulateInstructionARM64::*callback)(const uint32_t opcode);
const char *name;
} Opcode;
static Opcode *GetOpcodeForInstruction(const uint32_t opcode);
uint32_t GetFramePointerRegisterNumber() const;
bool BranchTo(const Context &context, uint32_t N, lldb::addr_t target);
bool ConditionHolds(const uint32_t cond);
bool UsingAArch32();
bool EmulateADDSUBImm(const uint32_t opcode);
template <AddrMode a_mode> bool EmulateLDPSTP(const uint32_t opcode);
template <AddrMode a_mode> bool EmulateLDRSTRImm(const uint32_t opcode);
bool EmulateB(const uint32_t opcode);
bool EmulateBcond(const uint32_t opcode);
bool EmulateCBZ(const uint32_t opcode);
bool EmulateTBZ(const uint32_t opcode);
ProcState m_opcode_pstate;
ProcState m_emulated_pstate; // This can get updated by the opcode.
bool m_ignore_conditions;
};
#endif // LLDB_SOURCE_PLUGINS_INSTRUCTION_ARM64_EMULATEINSTRUCTIONARM64_H
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