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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
//*****************************************************************************
// File: walker.h
//
//
// Debugger code stream analysis routines
//
//*****************************************************************************
#ifndef WALKER_H_
#define WALKER_H_
/* ========================================================================= */
/* ------------------------------------------------------------------------- *
* Constants
* ------------------------------------------------------------------------- */
enum WALK_TYPE
{
WALK_NEXT,
WALK_BRANCH,
WALK_COND_BRANCH,
WALK_CALL,
WALK_RETURN,
WALK_BREAK,
WALK_THROW,
WALK_META,
WALK_UNKNOWN
};
// struct holding information for the instruction being skipped over
struct InstructionAttribute
{
bool m_fIsCall; // is this a call instruction?
bool m_fIsCond; // is this a conditional jump?
bool m_fIsAbsBranch; // is this an absolute branch (either a call or a jump)?
bool m_fIsRelBranch; // is this a relative branch (either a call or a jump)?
bool m_fIsWrite; // does the instruction write to an address?
DWORD m_cbInstr; // the size of the instruction
DWORD m_cbDisp; // the size of the displacement
DWORD m_dwOffsetToDisp; // the offset from the beginning of the instruction
// to the beginning of the displacement
BYTE m_cOperandSize; // the size of the operand
void Reset()
{
m_fIsCall = false;
m_fIsCond = false;
m_fIsAbsBranch = false;
m_fIsRelBranch = false;
m_fIsWrite = false;
m_cbInstr = 0;
m_cbDisp = 0;
m_dwOffsetToDisp = 0;
m_cOperandSize = 0;
}
};
/* ------------------------------------------------------------------------- *
* Classes
* ------------------------------------------------------------------------- */
class Walker
{
protected:
Walker()
: m_type(WALK_UNKNOWN), m_registers(NULL), m_ip(0), m_skipIP(0), m_nextIP(0), m_isAbsoluteBranch(false)
{LIMITED_METHOD_CONTRACT; }
public:
virtual void Init(const BYTE *ip, REGDISPLAY *pregisters)
{
PREFIX_ASSUME(pregisters != NULL);
_ASSERTE(GetControlPC(pregisters) == (PCODE)ip);
m_registers = pregisters;
SetIP(ip);
}
const BYTE *GetIP()
{ return m_ip; }
WALK_TYPE GetOpcodeWalkType()
{ return m_type; }
const BYTE *GetSkipIP()
{ return m_skipIP; }
bool IsAbsoluteBranch()
{ return m_isAbsoluteBranch; }
const BYTE *GetNextIP()
{ return m_nextIP; }
// We don't currently keep the registers up to date
// <TODO> Check if it really works on IA64. </TODO>
virtual void Next() { m_registers = NULL; SetIP(m_nextIP); }
virtual void Skip() { m_registers = NULL; LOG((LF_CORDB, LL_INFO10000, "skipping over to %p \n", m_skipIP)); SetIP(m_skipIP); }
// Decode the instruction
virtual void Decode() = 0;
private:
void SetIP(const BYTE *ip)
{ m_ip = ip; Decode(); }
protected:
WALK_TYPE m_type; // Type of instructions
REGDISPLAY *m_registers; // Registers
const BYTE *m_ip; // Current IP
const BYTE *m_skipIP; // IP if we skip the instruction
const BYTE *m_nextIP; // IP if the instruction is taken
bool m_isAbsoluteBranch; // Is it an obsolute branch or not
};
#ifdef _TARGET_X86_
class NativeWalker : public Walker
{
public:
void Init(const BYTE *ip, REGDISPLAY *pregisters)
{
m_opcode = 0;
Walker::Init(ip, pregisters);
}
DWORD GetOpcode()
{ return m_opcode; }
/*
void SetRegDisplay(REGDISPLAY *registers)
{ m_registers = registers; }
*/
REGDISPLAY *GetRegDisplay()
{ return m_registers; }
void Decode();
void DecodeModRM(BYTE mod, BYTE reg, BYTE rm, const BYTE *ip);
static void DecodeInstructionForPatchSkip(const BYTE *address, InstructionAttribute * pInstrAttrib);
private:
DWORD GetRegisterValue(int registerNumber);
DWORD m_opcode; // Current instruction or opcode
};
#elif defined (_TARGET_ARM_)
class NativeWalker : public Walker
{
public:
void Init(const BYTE *ip, REGDISPLAY *pregisters)
{
Walker::Init(ip, pregisters);
}
void Decode();
private:
bool ConditionHolds(DWORD cond);
DWORD GetReg(DWORD reg);
};
#elif defined(_TARGET_AMD64_)
class NativeWalker : public Walker
{
public:
void Init(const BYTE *ip, REGDISPLAY *pregisters)
{
m_opcode = 0;
Walker::Init(ip, pregisters);
}
DWORD GetOpcode()
{ return m_opcode; }
/*
void SetRegDisplay(REGDISPLAY *registers)
{ m_registers = registers; }
*/
REGDISPLAY *GetRegDisplay()
{ return m_registers; }
void Decode();
void DecodeModRM(BYTE mod, BYTE reg, BYTE rm, const BYTE *ip);
static void DecodeInstructionForPatchSkip(const BYTE *address, InstructionAttribute * pInstrAttrib);
private:
UINT64 GetRegisterValue(int registerNumber);
DWORD m_opcode; // Current instruction or opcode
};
#elif defined (_TARGET_ARM64_)
#include "controller.h"
class NativeWalker : public Walker
{
public:
void Init(const BYTE *ip, REGDISPLAY *pregisters)
{
Walker::Init(ip, pregisters);
}
void Decode();
static void NativeWalker::DecodeInstructionForPatchSkip(const BYTE *address, InstructionAttribute * pInstrAttrib)
{
pInstrAttrib->Reset();
}
static BOOL NativeWalker::DecodePCRelativeBranchInst(PT_CONTEXT context,const PRD_TYPE& opcode, PCODE& offset, WALK_TYPE& walk);
static BOOL NativeWalker::DecodeCallInst(const PRD_TYPE& opcode, int& RegNum, WALK_TYPE& walk);
static BYTE* SetupOrSimulateInstructionForPatchSkip(T_CONTEXT * context, SharedPatchBypassBuffer * m_pSharedPatchBypassBuffer, const BYTE *address, PRD_TYPE opcode);
};
#else
PORTABILITY_WARNING("NativeWalker not implemented on this platform");
class NativeWalker : public Walker
{
public:
void Init(const BYTE *ip, REGDISPLAY *pregisters)
{
m_opcode = 0;
Walker::Init(ip, pregisters);
}
DWORD GetOpcode()
{ return m_opcode; }
void Next()
{ Walker::Next(); }
void Skip()
{ Walker::Skip(); }
void Decode()
{
PORTABILITY_ASSERT("NativeWalker not implemented on this platform");
m_type = WALK_UNKNOWN;
m_skipIP = m_ip++;
m_nextIP = m_ip++;
}
static void DecodeInstructionForPatchSkip(const BYTE *address, InstructionAttribute * pInstrAttrib)
{
PORTABILITY_ASSERT("NativeWalker not implemented on this platform");
}
private:
DWORD m_opcode; // Current instruction or opcode
};
#endif
#endif // WALKER_H_
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