RegisterContext.cpp [plain text]
#include "lldb/Target/RegisterContext.h"
#include "lldb/Core/DataExtractor.h"
#include "lldb/Core/RegisterValue.h"
#include "lldb/Core/Scalar.h"
#include "lldb/Host/Endian.h"
#include "lldb/Target/ExecutionContext.h"
#include "lldb/Target/StackFrame.h"
#include "lldb/Target/Process.h"
#include "lldb/Target/Thread.h"
using namespace lldb;
using namespace lldb_private;
RegisterContext::RegisterContext (Thread &thread, uint32_t concrete_frame_idx) :
m_thread (thread),
m_concrete_frame_idx (concrete_frame_idx),
m_stop_id (thread.GetProcess().GetStopID())
{
}
RegisterContext::~RegisterContext()
{
}
void
RegisterContext::InvalidateIfNeeded (bool force)
{
const uint32_t this_stop_id = GetStopID();
const uint32_t process_stop_id = m_thread.GetProcess().GetStopID();
if (force || process_stop_id != this_stop_id)
{
InvalidateAllRegisters ();
SetStopID (process_stop_id);
}
}
const RegisterInfo *
RegisterContext::GetRegisterInfoByName (const char *reg_name, uint32_t start_idx)
{
if (reg_name && reg_name[0])
{
const uint32_t num_registers = GetRegisterCount();
for (uint32_t reg = start_idx; reg < num_registers; ++reg)
{
const RegisterInfo * reg_info = GetRegisterInfoAtIndex(reg);
if ((reg_info->name != NULL && ::strcasecmp (reg_info->name, reg_name) == 0) ||
(reg_info->alt_name != NULL && ::strcasecmp (reg_info->alt_name, reg_name) == 0))
{
return reg_info;
}
}
}
return NULL;
}
const char *
RegisterContext::GetRegisterName (uint32_t reg)
{
const RegisterInfo * reg_info = GetRegisterInfoAtIndex(reg);
if (reg_info)
return reg_info->name;
return NULL;
}
uint64_t
RegisterContext::GetPC(uint64_t fail_value)
{
uint32_t reg = ConvertRegisterKindToRegisterNumber (eRegisterKindGeneric, LLDB_REGNUM_GENERIC_PC);
return ReadRegisterAsUnsigned (reg, fail_value);
}
bool
RegisterContext::SetPC(uint64_t pc)
{
uint32_t reg = ConvertRegisterKindToRegisterNumber (eRegisterKindGeneric, LLDB_REGNUM_GENERIC_PC);
bool success = WriteRegisterFromUnsigned (reg, pc);
if (success)
{
StackFrameSP frame_sp(m_thread.GetFrameWithConcreteFrameIndex (m_concrete_frame_idx));
if (frame_sp)
frame_sp->ChangePC(pc);
else
m_thread.ClearStackFrames ();
}
return success;
}
uint64_t
RegisterContext::GetSP(uint64_t fail_value)
{
uint32_t reg = ConvertRegisterKindToRegisterNumber (eRegisterKindGeneric, LLDB_REGNUM_GENERIC_SP);
return ReadRegisterAsUnsigned (reg, fail_value);
}
bool
RegisterContext::SetSP(uint64_t sp)
{
uint32_t reg = ConvertRegisterKindToRegisterNumber (eRegisterKindGeneric, LLDB_REGNUM_GENERIC_SP);
return WriteRegisterFromUnsigned (reg, sp);
}
uint64_t
RegisterContext::GetFP(uint64_t fail_value)
{
uint32_t reg = ConvertRegisterKindToRegisterNumber (eRegisterKindGeneric, LLDB_REGNUM_GENERIC_FP);
return ReadRegisterAsUnsigned (reg, fail_value);
}
bool
RegisterContext::SetFP(uint64_t fp)
{
uint32_t reg = ConvertRegisterKindToRegisterNumber (eRegisterKindGeneric, LLDB_REGNUM_GENERIC_FP);
return WriteRegisterFromUnsigned (reg, fp);
}
uint64_t
RegisterContext::GetReturnAddress (uint64_t fail_value)
{
uint32_t reg = ConvertRegisterKindToRegisterNumber (eRegisterKindGeneric, LLDB_REGNUM_GENERIC_RA);
return ReadRegisterAsUnsigned (reg, fail_value);
}
uint64_t
RegisterContext::GetFlags (uint64_t fail_value)
{
uint32_t reg = ConvertRegisterKindToRegisterNumber (eRegisterKindGeneric, LLDB_REGNUM_GENERIC_FLAGS);
return ReadRegisterAsUnsigned (reg, fail_value);
}
uint64_t
RegisterContext::ReadRegisterAsUnsigned (uint32_t reg, uint64_t fail_value)
{
if (reg != LLDB_INVALID_REGNUM)
return ReadRegisterAsUnsigned (GetRegisterInfoAtIndex (reg), fail_value);
return fail_value;
}
uint64_t
RegisterContext::ReadRegisterAsUnsigned (const RegisterInfo *reg_info, uint64_t fail_value)
{
if (reg_info)
{
RegisterValue value;
if (ReadRegister (reg_info, value))
return value.GetAsUInt64();
}
return fail_value;
}
bool
RegisterContext::WriteRegisterFromUnsigned (uint32_t reg, uint64_t uval)
{
if (reg == LLDB_INVALID_REGNUM)
return false;
return WriteRegisterFromUnsigned (GetRegisterInfoAtIndex (reg), uval);
}
bool
RegisterContext::WriteRegisterFromUnsigned (const RegisterInfo *reg_info, uint64_t uval)
{
if (reg_info)
{
RegisterValue value;
if (value.SetUInt(uval, reg_info->byte_size))
return WriteRegister (reg_info, value);
}
return false;
}
lldb::tid_t
RegisterContext::GetThreadID() const
{
return m_thread.GetID();
}
uint32_t
RegisterContext::NumSupportedHardwareBreakpoints ()
{
return 0;
}
uint32_t
RegisterContext::SetHardwareBreakpoint (lldb::addr_t addr, size_t size)
{
return LLDB_INVALID_INDEX32;
}
bool
RegisterContext::ClearHardwareBreakpoint (uint32_t hw_idx)
{
return false;
}
uint32_t
RegisterContext::NumSupportedHardwareWatchpoints ()
{
return 0;
}
uint32_t
RegisterContext::SetHardwareWatchpoint (lldb::addr_t addr, size_t size, bool read, bool write)
{
return LLDB_INVALID_INDEX32;
}
bool
RegisterContext::ClearHardwareWatchpoint (uint32_t hw_index)
{
return false;
}
bool
RegisterContext::HardwareSingleStep (bool enable)
{
return false;
}
Error
RegisterContext::ReadRegisterValueFromMemory (const RegisterInfo *reg_info,
lldb::addr_t src_addr,
uint32_t src_len,
RegisterValue ®_value)
{
Error error;
if (reg_info == NULL)
{
error.SetErrorString ("invalid register info argument.");
return error;
}
if (src_len > RegisterValue::kMaxRegisterByteSize)
{
error.SetErrorString ("register too small to receive memory data");
return error;
}
const uint32_t dst_len = reg_info->byte_size;
if (src_len > dst_len)
{
error.SetErrorStringWithFormat("%u bytes is too big to store in register %s (%u bytes)", src_len, reg_info->name, dst_len);
return error;
}
Process &process = m_thread.GetProcess();
uint8_t src[RegisterValue::kMaxRegisterByteSize];
const uint32_t bytes_read = process.ReadMemory (src_addr, src, src_len, error);
if (bytes_read != src_len)
{
if (error.Success())
{
error.SetErrorStringWithFormat("read %u of %u bytes", bytes_read, src_len);
}
return error;
}
reg_value.SetFromMemoryData (reg_info,
src,
src_len,
process.GetByteOrder(),
error);
return error;
}
Error
RegisterContext::WriteRegisterValueToMemory (const RegisterInfo *reg_info,
lldb::addr_t dst_addr,
uint32_t dst_len,
const RegisterValue ®_value)
{
uint8_t dst[RegisterValue::kMaxRegisterByteSize];
Error error;
Process &process = m_thread.GetProcess();
const uint32_t bytes_copied = reg_value.GetAsMemoryData (reg_info,
dst,
dst_len,
process.GetByteOrder(),
error);
if (error.Success())
{
if (bytes_copied == 0)
{
error.SetErrorString("byte copy failed.");
}
else
{
const uint32_t bytes_written = process.WriteMemory (dst_addr, dst, bytes_copied, error);
if (bytes_written != bytes_copied)
{
if (error.Success())
{
error.SetErrorStringWithFormat("only wrote %u of %u bytes", bytes_written, bytes_copied);
}
}
}
}
return error;
}
Target *
RegisterContext::CalculateTarget ()
{
return m_thread.CalculateTarget();
}
Process *
RegisterContext::CalculateProcess ()
{
return m_thread.CalculateProcess ();
}
Thread *
RegisterContext::CalculateThread ()
{
return &m_thread;
}
StackFrame *
RegisterContext::CalculateStackFrame ()
{
return NULL;
}
void
RegisterContext::CalculateExecutionContext (ExecutionContext &exe_ctx)
{
m_thread.CalculateExecutionContext (exe_ctx);
}
bool
RegisterContext::ConvertBetweenRegisterKinds (int source_rk, uint32_t source_regnum, int target_rk, uint32_t& target_regnum)
{
const uint32_t num_registers = GetRegisterCount();
for (uint32_t reg = 0; reg < num_registers; ++reg)
{
const RegisterInfo * reg_info = GetRegisterInfoAtIndex (reg);
if (reg_info->kinds[source_rk] == source_regnum)
{
target_regnum = reg_info->kinds[target_rk];
if (target_regnum == LLDB_INVALID_REGNUM)
{
return false;
}
else
{
return true;
}
}
}
return false;
}