635 lines
18 KiB
C++
635 lines
18 KiB
C++
//===-- RegisterContext.cpp -------------------------------------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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// C Includes
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// C++ Includes
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// Other libraries and framework includes
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// Project includes
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#include "lldb/Target/RegisterContext.h"
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#include "lldb/Core/DataExtractor.h"
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#include "lldb/Core/RegisterValue.h"
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#include "lldb/Core/Scalar.h"
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#include "lldb/Host/Endian.h"
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#include "lldb/Target/ExecutionContext.h"
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#include "lldb/Target/StackFrame.h"
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#include "lldb/Target/Process.h"
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#include "lldb/Target/Thread.h"
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using namespace lldb;
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using namespace lldb_private;
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RegisterContext::RegisterContext (Thread &thread, uint32_t concrete_frame_idx) :
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m_thread (thread),
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m_concrete_frame_idx (concrete_frame_idx),
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m_stop_id (thread.GetProcess()->GetStopID())
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{
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}
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//----------------------------------------------------------------------
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// Destructor
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//----------------------------------------------------------------------
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RegisterContext::~RegisterContext()
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{
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}
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void
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RegisterContext::InvalidateIfNeeded (bool force)
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{
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ProcessSP process_sp (m_thread.GetProcess());
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bool invalidate = force;
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uint32_t process_stop_id = UINT32_MAX;
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if (process_sp)
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process_stop_id = process_sp->GetStopID();
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else
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invalidate = true;
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if (!invalidate)
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invalidate = process_stop_id != GetStopID();
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if (invalidate)
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{
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InvalidateAllRegisters ();
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SetStopID (process_stop_id);
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}
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}
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const RegisterInfo *
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RegisterContext::GetRegisterInfoByName (const char *reg_name, uint32_t start_idx)
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{
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if (reg_name && reg_name[0])
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{
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const uint32_t num_registers = GetRegisterCount();
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for (uint32_t reg = start_idx; reg < num_registers; ++reg)
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{
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const RegisterInfo * reg_info = GetRegisterInfoAtIndex(reg);
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if ((reg_info->name != NULL && ::strcasecmp (reg_info->name, reg_name) == 0) ||
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(reg_info->alt_name != NULL && ::strcasecmp (reg_info->alt_name, reg_name) == 0))
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{
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return reg_info;
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}
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}
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}
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return NULL;
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}
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const RegisterInfo *
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RegisterContext::GetRegisterInfo (lldb::RegisterKind kind, uint32_t num)
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{
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const uint32_t reg_num = ConvertRegisterKindToRegisterNumber(kind, num);
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if (reg_num == LLDB_INVALID_REGNUM)
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return NULL;
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return GetRegisterInfoAtIndex (reg_num);
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}
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const char *
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RegisterContext::GetRegisterName (uint32_t reg)
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{
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const RegisterInfo * reg_info = GetRegisterInfoAtIndex(reg);
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if (reg_info)
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return reg_info->name;
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return NULL;
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}
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uint64_t
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RegisterContext::GetPC(uint64_t fail_value)
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{
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uint32_t reg = ConvertRegisterKindToRegisterNumber (eRegisterKindGeneric, LLDB_REGNUM_GENERIC_PC);
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return ReadRegisterAsUnsigned (reg, fail_value);
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}
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bool
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RegisterContext::SetPC(uint64_t pc)
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{
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uint32_t reg = ConvertRegisterKindToRegisterNumber (eRegisterKindGeneric, LLDB_REGNUM_GENERIC_PC);
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bool success = WriteRegisterFromUnsigned (reg, pc);
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if (success)
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{
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StackFrameSP frame_sp(m_thread.GetFrameWithConcreteFrameIndex (m_concrete_frame_idx));
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if (frame_sp)
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frame_sp->ChangePC(pc);
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else
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m_thread.ClearStackFrames ();
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}
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return success;
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}
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bool
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RegisterContext::SetPC(Address addr)
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{
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TargetSP target_sp = m_thread.CalculateTarget();
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Target *target = target_sp.get();
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lldb::addr_t callAddr = addr.GetCallableLoadAddress (target);
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if (callAddr == LLDB_INVALID_ADDRESS)
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return false;
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return SetPC (callAddr);
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}
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uint64_t
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RegisterContext::GetSP(uint64_t fail_value)
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{
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uint32_t reg = ConvertRegisterKindToRegisterNumber (eRegisterKindGeneric, LLDB_REGNUM_GENERIC_SP);
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return ReadRegisterAsUnsigned (reg, fail_value);
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}
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bool
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RegisterContext::SetSP(uint64_t sp)
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{
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uint32_t reg = ConvertRegisterKindToRegisterNumber (eRegisterKindGeneric, LLDB_REGNUM_GENERIC_SP);
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return WriteRegisterFromUnsigned (reg, sp);
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}
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uint64_t
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RegisterContext::GetFP(uint64_t fail_value)
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{
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uint32_t reg = ConvertRegisterKindToRegisterNumber (eRegisterKindGeneric, LLDB_REGNUM_GENERIC_FP);
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return ReadRegisterAsUnsigned (reg, fail_value);
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}
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bool
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RegisterContext::SetFP(uint64_t fp)
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{
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uint32_t reg = ConvertRegisterKindToRegisterNumber (eRegisterKindGeneric, LLDB_REGNUM_GENERIC_FP);
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return WriteRegisterFromUnsigned (reg, fp);
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}
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uint64_t
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RegisterContext::GetReturnAddress (uint64_t fail_value)
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{
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uint32_t reg = ConvertRegisterKindToRegisterNumber (eRegisterKindGeneric, LLDB_REGNUM_GENERIC_RA);
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return ReadRegisterAsUnsigned (reg, fail_value);
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}
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uint64_t
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RegisterContext::GetFlags (uint64_t fail_value)
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{
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uint32_t reg = ConvertRegisterKindToRegisterNumber (eRegisterKindGeneric, LLDB_REGNUM_GENERIC_FLAGS);
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return ReadRegisterAsUnsigned (reg, fail_value);
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}
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uint64_t
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RegisterContext::ReadRegisterAsUnsigned (uint32_t reg, uint64_t fail_value)
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{
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if (reg != LLDB_INVALID_REGNUM)
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return ReadRegisterAsUnsigned (GetRegisterInfoAtIndex (reg), fail_value);
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return fail_value;
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}
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uint64_t
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RegisterContext::ReadRegisterAsUnsigned (const RegisterInfo *reg_info, uint64_t fail_value)
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{
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if (reg_info)
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{
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RegisterValue value;
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if (ReadRegister (reg_info, value))
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return value.GetAsUInt64();
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}
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return fail_value;
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}
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bool
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RegisterContext::WriteRegisterFromUnsigned (uint32_t reg, uint64_t uval)
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{
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if (reg == LLDB_INVALID_REGNUM)
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return false;
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return WriteRegisterFromUnsigned (GetRegisterInfoAtIndex (reg), uval);
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}
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bool
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RegisterContext::WriteRegisterFromUnsigned (const RegisterInfo *reg_info, uint64_t uval)
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{
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if (reg_info)
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{
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RegisterValue value;
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if (value.SetUInt(uval, reg_info->byte_size))
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return WriteRegister (reg_info, value);
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}
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return false;
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}
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bool
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RegisterContext::CopyFromRegisterContext (lldb::RegisterContextSP context)
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{
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uint32_t num_register_sets = context->GetRegisterSetCount();
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// We don't know that two threads have the same register context, so require the threads to be the same.
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if (context->GetThreadID() != GetThreadID())
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return false;
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if (num_register_sets != GetRegisterSetCount())
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return false;
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RegisterContextSP frame_zero_context = m_thread.GetRegisterContext();
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for (uint32_t set_idx = 0; set_idx < num_register_sets; ++set_idx)
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{
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const RegisterSet * const reg_set = GetRegisterSet(set_idx);
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const uint32_t num_registers = reg_set->num_registers;
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for (uint32_t reg_idx = 0; reg_idx < num_registers; ++reg_idx)
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{
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const uint32_t reg = reg_set->registers[reg_idx];
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const RegisterInfo *reg_info = GetRegisterInfoAtIndex(reg);
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if (!reg_info || reg_info->value_regs)
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continue;
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RegisterValue reg_value;
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// If we can reconstruct the register from the frame we are copying from, then do so, otherwise
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// use the value from frame 0.
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if (context->ReadRegister(reg_info, reg_value))
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{
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WriteRegister(reg_info, reg_value);
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}
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else if (frame_zero_context->ReadRegister(reg_info, reg_value))
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{
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WriteRegister(reg_info, reg_value);
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}
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}
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}
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return true;
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}
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lldb::tid_t
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RegisterContext::GetThreadID() const
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{
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return m_thread.GetID();
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}
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uint32_t
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RegisterContext::NumSupportedHardwareBreakpoints ()
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{
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return 0;
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}
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uint32_t
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RegisterContext::SetHardwareBreakpoint (lldb::addr_t addr, size_t size)
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{
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return LLDB_INVALID_INDEX32;
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}
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bool
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RegisterContext::ClearHardwareBreakpoint (uint32_t hw_idx)
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{
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return false;
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}
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uint32_t
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RegisterContext::NumSupportedHardwareWatchpoints ()
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{
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return 0;
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}
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uint32_t
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RegisterContext::SetHardwareWatchpoint (lldb::addr_t addr, size_t size, bool read, bool write)
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{
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return LLDB_INVALID_INDEX32;
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}
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bool
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RegisterContext::ClearHardwareWatchpoint (uint32_t hw_index)
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{
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return false;
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}
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bool
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RegisterContext::HardwareSingleStep (bool enable)
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{
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return false;
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}
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Error
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RegisterContext::ReadRegisterValueFromMemory (const RegisterInfo *reg_info,
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lldb::addr_t src_addr,
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uint32_t src_len,
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RegisterValue ®_value)
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{
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Error error;
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if (reg_info == NULL)
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{
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error.SetErrorString ("invalid register info argument.");
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return error;
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}
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// Moving from addr into a register
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//
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// Case 1: src_len == dst_len
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//
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// |AABBCCDD| Address contents
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// |AABBCCDD| Register contents
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//
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// Case 2: src_len > dst_len
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//
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// Error! (The register should always be big enough to hold the data)
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//
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// Case 3: src_len < dst_len
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//
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// |AABB| Address contents
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// |AABB0000| Register contents [on little-endian hardware]
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// |0000AABB| Register contents [on big-endian hardware]
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if (src_len > RegisterValue::kMaxRegisterByteSize)
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{
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error.SetErrorString ("register too small to receive memory data");
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return error;
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}
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const uint32_t dst_len = reg_info->byte_size;
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if (src_len > dst_len)
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{
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error.SetErrorStringWithFormat("%u bytes is too big to store in register %s (%u bytes)", src_len, reg_info->name, dst_len);
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return error;
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}
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ProcessSP process_sp (m_thread.GetProcess());
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if (process_sp)
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{
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uint8_t src[RegisterValue::kMaxRegisterByteSize];
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// Read the memory
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const uint32_t bytes_read = process_sp->ReadMemory (src_addr, src, src_len, error);
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// Make sure the memory read succeeded...
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if (bytes_read != src_len)
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{
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if (error.Success())
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{
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// This might happen if we read _some_ bytes but not all
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error.SetErrorStringWithFormat("read %u of %u bytes", bytes_read, src_len);
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}
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return error;
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}
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// We now have a memory buffer that contains the part or all of the register
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// value. Set the register value using this memory data.
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// TODO: we might need to add a parameter to this function in case the byte
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// order of the memory data doesn't match the process. For now we are assuming
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// they are the same.
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reg_value.SetFromMemoryData (reg_info,
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src,
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src_len,
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process_sp->GetByteOrder(),
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error);
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}
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else
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error.SetErrorString("invalid process");
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return error;
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}
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Error
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RegisterContext::WriteRegisterValueToMemory (const RegisterInfo *reg_info,
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lldb::addr_t dst_addr,
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uint32_t dst_len,
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const RegisterValue ®_value)
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{
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uint8_t dst[RegisterValue::kMaxRegisterByteSize];
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Error error;
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ProcessSP process_sp (m_thread.GetProcess());
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if (process_sp)
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{
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// TODO: we might need to add a parameter to this function in case the byte
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// order of the memory data doesn't match the process. For now we are assuming
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// they are the same.
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const uint32_t bytes_copied = reg_value.GetAsMemoryData (reg_info,
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dst,
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dst_len,
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process_sp->GetByteOrder(),
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error);
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if (error.Success())
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{
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if (bytes_copied == 0)
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{
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error.SetErrorString("byte copy failed.");
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}
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else
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{
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const uint32_t bytes_written = process_sp->WriteMemory (dst_addr, dst, bytes_copied, error);
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if (bytes_written != bytes_copied)
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{
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if (error.Success())
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{
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// This might happen if we read _some_ bytes but not all
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error.SetErrorStringWithFormat("only wrote %u of %u bytes", bytes_written, bytes_copied);
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}
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}
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}
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}
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}
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else
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error.SetErrorString("invalid process");
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return error;
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}
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bool
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RegisterContext::ReadAllRegisterValues (lldb_private::RegisterCheckpoint ®_checkpoint)
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{
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return ReadAllRegisterValues(reg_checkpoint.GetData());
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}
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bool
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RegisterContext::WriteAllRegisterValues (const lldb_private::RegisterCheckpoint ®_checkpoint)
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{
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return WriteAllRegisterValues(reg_checkpoint.GetData());
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}
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TargetSP
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RegisterContext::CalculateTarget ()
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{
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return m_thread.CalculateTarget();
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}
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ProcessSP
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RegisterContext::CalculateProcess ()
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{
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return m_thread.CalculateProcess ();
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}
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ThreadSP
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RegisterContext::CalculateThread ()
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{
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return m_thread.shared_from_this();
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}
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StackFrameSP
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RegisterContext::CalculateStackFrame ()
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{
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// Register contexts might belong to many frames if we have inlined
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// functions inside a frame since all inlined functions share the
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// same registers, so we can't definitively say which frame we come from...
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return StackFrameSP();
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}
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void
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RegisterContext::CalculateExecutionContext (ExecutionContext &exe_ctx)
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{
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m_thread.CalculateExecutionContext (exe_ctx);
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}
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bool
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RegisterContext::ConvertBetweenRegisterKinds (lldb::RegisterKind source_rk, uint32_t source_regnum, lldb::RegisterKind target_rk, uint32_t& target_regnum)
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{
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const uint32_t num_registers = GetRegisterCount();
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for (uint32_t reg = 0; reg < num_registers; ++reg)
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{
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const RegisterInfo * reg_info = GetRegisterInfoAtIndex (reg);
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if (reg_info->kinds[source_rk] == source_regnum)
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{
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target_regnum = reg_info->kinds[target_rk];
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if (target_regnum == LLDB_INVALID_REGNUM)
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{
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return false;
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}
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else
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{
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return true;
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}
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}
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}
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return false;
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}
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//bool
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//RegisterContext::ReadRegisterValue (uint32_t reg, Scalar &value)
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//{
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// DataExtractor data;
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// if (!ReadRegisterBytes (reg, data))
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// return false;
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//
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// const RegisterInfo *reg_info = GetRegisterInfoAtIndex (reg);
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// uint32_t offset = 0;
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// switch (reg_info->encoding)
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// {
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// case eEncodingInvalid:
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// case eEncodingVector:
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// break;
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//
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// case eEncodingUint:
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// switch (reg_info->byte_size)
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// {
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// case 1:
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// {
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// value = data.GetU8 (&offset);
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// return true;
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// }
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// case 2:
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// {
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// value = data.GetU16 (&offset);
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// return true;
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// }
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// case 4:
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// {
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// value = data.GetU32 (&offset);
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// return true;
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// }
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// case 8:
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// {
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// value = data.GetU64 (&offset);
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// return true;
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// }
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// }
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// break;
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// case eEncodingSint:
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// switch (reg_info->byte_size)
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// {
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// case 1:
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// {
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// int8_t v;
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// if (data.ExtractBytes (0, sizeof (int8_t), lldb::endian::InlHostByteOrder(), &v) != sizeof (int8_t))
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// return false;
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// value = v;
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// return true;
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// }
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// case 2:
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// {
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// int16_t v;
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// if (data.ExtractBytes (0, sizeof (int16_t), lldb::endian::InlHostByteOrder(), &v) != sizeof (int16_t))
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// return false;
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// value = v;
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// return true;
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// }
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// case 4:
|
|
// {
|
|
// int32_t v;
|
|
// if (data.ExtractBytes (0, sizeof (int32_t), lldb::endian::InlHostByteOrder(), &v) != sizeof (int32_t))
|
|
// return false;
|
|
// value = v;
|
|
// return true;
|
|
// }
|
|
// case 8:
|
|
// {
|
|
// int64_t v;
|
|
// if (data.ExtractBytes (0, sizeof (int64_t), lldb::endian::InlHostByteOrder(), &v) != sizeof (int64_t))
|
|
// return false;
|
|
// value = v;
|
|
// return true;
|
|
// }
|
|
// }
|
|
// break;
|
|
// case eEncodingIEEE754:
|
|
// switch (reg_info->byte_size)
|
|
// {
|
|
// case sizeof (float):
|
|
// {
|
|
// float v;
|
|
// if (data.ExtractBytes (0, sizeof (float), lldb::endian::InlHostByteOrder(), &v) != sizeof (float))
|
|
// return false;
|
|
// value = v;
|
|
// return true;
|
|
// }
|
|
// case sizeof (double):
|
|
// {
|
|
// double v;
|
|
// if (data.ExtractBytes (0, sizeof (double), lldb::endian::InlHostByteOrder(), &v) != sizeof (double))
|
|
// return false;
|
|
// value = v;
|
|
// return true;
|
|
// }
|
|
// case sizeof (long double):
|
|
// {
|
|
// double v;
|
|
// if (data.ExtractBytes (0, sizeof (long double), lldb::endian::InlHostByteOrder(), &v) != sizeof (long double))
|
|
// return false;
|
|
// value = v;
|
|
// return true;
|
|
// }
|
|
// }
|
|
// break;
|
|
// }
|
|
// return false;
|
|
//}
|
|
//
|
|
//bool
|
|
//RegisterContext::WriteRegisterValue (uint32_t reg, const Scalar &value)
|
|
//{
|
|
// DataExtractor data;
|
|
// if (!value.IsValid())
|
|
// return false;
|
|
// if (!value.GetData (data))
|
|
// return false;
|
|
//
|
|
// return WriteRegisterBytes (reg, data);
|
|
//}
|