1 //===-- RegisterContext.cpp -------------------------------------*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
12 // Other libraries and framework includes
14 #include "lldb/Target/RegisterContext.h"
15 #include "lldb/Core/DataExtractor.h"
16 #include "lldb/Core/RegisterValue.h"
17 #include "lldb/Core/Scalar.h"
18 #include "lldb/Host/Endian.h"
19 #include "lldb/Target/ExecutionContext.h"
20 #include "lldb/Target/StackFrame.h"
21 #include "lldb/Target/Process.h"
22 #include "lldb/Target/Thread.h"
25 using namespace lldb_private;
27 RegisterContext::RegisterContext (Thread &thread, uint32_t concrete_frame_idx) :
29 m_concrete_frame_idx (concrete_frame_idx),
30 m_stop_id (thread.GetProcess()->GetStopID())
34 //----------------------------------------------------------------------
36 //----------------------------------------------------------------------
37 RegisterContext::~RegisterContext()
42 RegisterContext::InvalidateIfNeeded (bool force)
44 ProcessSP process_sp (m_thread.GetProcess());
45 bool invalidate = force;
46 uint32_t process_stop_id = UINT32_MAX;
49 process_stop_id = process_sp->GetStopID();
54 invalidate = process_stop_id != GetStopID();
58 InvalidateAllRegisters ();
59 SetStopID (process_stop_id);
65 RegisterContext::GetRegisterInfoByName (const char *reg_name, uint32_t start_idx)
67 if (reg_name && reg_name[0])
69 const uint32_t num_registers = GetRegisterCount();
70 for (uint32_t reg = start_idx; reg < num_registers; ++reg)
72 const RegisterInfo * reg_info = GetRegisterInfoAtIndex(reg);
74 if ((reg_info->name != NULL && ::strcasecmp (reg_info->name, reg_name) == 0) ||
75 (reg_info->alt_name != NULL && ::strcasecmp (reg_info->alt_name, reg_name) == 0))
85 RegisterContext::GetRegisterName (uint32_t reg)
87 const RegisterInfo * reg_info = GetRegisterInfoAtIndex(reg);
89 return reg_info->name;
94 RegisterContext::GetPC(uint64_t fail_value)
96 uint32_t reg = ConvertRegisterKindToRegisterNumber (eRegisterKindGeneric, LLDB_REGNUM_GENERIC_PC);
97 return ReadRegisterAsUnsigned (reg, fail_value);
101 RegisterContext::SetPC(uint64_t pc)
103 uint32_t reg = ConvertRegisterKindToRegisterNumber (eRegisterKindGeneric, LLDB_REGNUM_GENERIC_PC);
104 bool success = WriteRegisterFromUnsigned (reg, pc);
107 StackFrameSP frame_sp(m_thread.GetFrameWithConcreteFrameIndex (m_concrete_frame_idx));
109 frame_sp->ChangePC(pc);
111 m_thread.ClearStackFrames ();
117 RegisterContext::GetSP(uint64_t fail_value)
119 uint32_t reg = ConvertRegisterKindToRegisterNumber (eRegisterKindGeneric, LLDB_REGNUM_GENERIC_SP);
120 return ReadRegisterAsUnsigned (reg, fail_value);
124 RegisterContext::SetSP(uint64_t sp)
126 uint32_t reg = ConvertRegisterKindToRegisterNumber (eRegisterKindGeneric, LLDB_REGNUM_GENERIC_SP);
127 return WriteRegisterFromUnsigned (reg, sp);
131 RegisterContext::GetFP(uint64_t fail_value)
133 uint32_t reg = ConvertRegisterKindToRegisterNumber (eRegisterKindGeneric, LLDB_REGNUM_GENERIC_FP);
134 return ReadRegisterAsUnsigned (reg, fail_value);
138 RegisterContext::SetFP(uint64_t fp)
140 uint32_t reg = ConvertRegisterKindToRegisterNumber (eRegisterKindGeneric, LLDB_REGNUM_GENERIC_FP);
141 return WriteRegisterFromUnsigned (reg, fp);
145 RegisterContext::GetReturnAddress (uint64_t fail_value)
147 uint32_t reg = ConvertRegisterKindToRegisterNumber (eRegisterKindGeneric, LLDB_REGNUM_GENERIC_RA);
148 return ReadRegisterAsUnsigned (reg, fail_value);
152 RegisterContext::GetFlags (uint64_t fail_value)
154 uint32_t reg = ConvertRegisterKindToRegisterNumber (eRegisterKindGeneric, LLDB_REGNUM_GENERIC_FLAGS);
155 return ReadRegisterAsUnsigned (reg, fail_value);
160 RegisterContext::ReadRegisterAsUnsigned (uint32_t reg, uint64_t fail_value)
162 if (reg != LLDB_INVALID_REGNUM)
163 return ReadRegisterAsUnsigned (GetRegisterInfoAtIndex (reg), fail_value);
168 RegisterContext::ReadRegisterAsUnsigned (const RegisterInfo *reg_info, uint64_t fail_value)
173 if (ReadRegister (reg_info, value))
174 return value.GetAsUInt64();
180 RegisterContext::WriteRegisterFromUnsigned (uint32_t reg, uint64_t uval)
182 if (reg == LLDB_INVALID_REGNUM)
184 return WriteRegisterFromUnsigned (GetRegisterInfoAtIndex (reg), uval);
188 RegisterContext::WriteRegisterFromUnsigned (const RegisterInfo *reg_info, uint64_t uval)
193 if (value.SetUInt(uval, reg_info->byte_size))
194 return WriteRegister (reg_info, value);
200 RegisterContext::CopyFromRegisterContext (lldb::RegisterContextSP context)
202 uint32_t num_register_sets = context->GetRegisterSetCount();
203 // We don't know that two threads have the same register context, so require the threads to be the same.
204 if (context->GetThreadID() != GetThreadID())
207 if (num_register_sets != GetRegisterSetCount())
210 RegisterContextSP frame_zero_context = m_thread.GetRegisterContext();
212 for (uint32_t set_idx = 0; set_idx < num_register_sets; ++set_idx)
214 const RegisterSet * const reg_set = GetRegisterSet(set_idx);
216 const uint32_t num_registers = reg_set->num_registers;
217 for (uint32_t reg_idx = 0; reg_idx < num_registers; ++reg_idx)
219 const uint32_t reg = reg_set->registers[reg_idx];
220 const RegisterInfo *reg_info = GetRegisterInfoAtIndex(reg);
221 if (!reg_info || reg_info->value_regs)
223 RegisterValue reg_value;
225 // If we can reconstruct the register from the frame we are copying from, then do so, otherwise
226 // use the value from frame 0.
227 if (context->ReadRegister(reg_info, reg_value))
229 WriteRegister(reg_info, reg_value);
231 else if (frame_zero_context->ReadRegister(reg_info, reg_value))
233 WriteRegister(reg_info, reg_value);
241 RegisterContext::GetThreadID() const
243 return m_thread.GetID();
247 RegisterContext::NumSupportedHardwareBreakpoints ()
253 RegisterContext::SetHardwareBreakpoint (lldb::addr_t addr, size_t size)
255 return LLDB_INVALID_INDEX32;
259 RegisterContext::ClearHardwareBreakpoint (uint32_t hw_idx)
266 RegisterContext::NumSupportedHardwareWatchpoints ()
272 RegisterContext::SetHardwareWatchpoint (lldb::addr_t addr, size_t size, bool read, bool write)
274 return LLDB_INVALID_INDEX32;
278 RegisterContext::ClearHardwareWatchpoint (uint32_t hw_index)
284 RegisterContext::HardwareSingleStep (bool enable)
290 RegisterContext::ReadRegisterValueFromMemory (const RegisterInfo *reg_info,
291 lldb::addr_t src_addr,
293 RegisterValue ®_value)
296 if (reg_info == NULL)
298 error.SetErrorString ("invalid register info argument.");
303 // Moving from addr into a register
305 // Case 1: src_len == dst_len
307 // |AABBCCDD| Address contents
308 // |AABBCCDD| Register contents
310 // Case 2: src_len > dst_len
312 // Error! (The register should always be big enough to hold the data)
314 // Case 3: src_len < dst_len
316 // |AABB| Address contents
317 // |AABB0000| Register contents [on little-endian hardware]
318 // |0000AABB| Register contents [on big-endian hardware]
319 if (src_len > RegisterValue::kMaxRegisterByteSize)
321 error.SetErrorString ("register too small to receive memory data");
325 const uint32_t dst_len = reg_info->byte_size;
327 if (src_len > dst_len)
329 error.SetErrorStringWithFormat("%u bytes is too big to store in register %s (%u bytes)", src_len, reg_info->name, dst_len);
333 ProcessSP process_sp (m_thread.GetProcess());
336 uint8_t src[RegisterValue::kMaxRegisterByteSize];
339 const uint32_t bytes_read = process_sp->ReadMemory (src_addr, src, src_len, error);
341 // Make sure the memory read succeeded...
342 if (bytes_read != src_len)
346 // This might happen if we read _some_ bytes but not all
347 error.SetErrorStringWithFormat("read %u of %u bytes", bytes_read, src_len);
352 // We now have a memory buffer that contains the part or all of the register
353 // value. Set the register value using this memory data.
354 // TODO: we might need to add a parameter to this function in case the byte
355 // order of the memory data doesn't match the process. For now we are assuming
356 // they are the same.
357 reg_value.SetFromMemoryData (reg_info,
360 process_sp->GetByteOrder(),
364 error.SetErrorString("invalid process");
370 RegisterContext::WriteRegisterValueToMemory (const RegisterInfo *reg_info,
371 lldb::addr_t dst_addr,
373 const RegisterValue ®_value)
376 uint8_t dst[RegisterValue::kMaxRegisterByteSize];
380 ProcessSP process_sp (m_thread.GetProcess());
384 // TODO: we might need to add a parameter to this function in case the byte
385 // order of the memory data doesn't match the process. For now we are assuming
386 // they are the same.
388 const uint32_t bytes_copied = reg_value.GetAsMemoryData (reg_info,
391 process_sp->GetByteOrder(),
396 if (bytes_copied == 0)
398 error.SetErrorString("byte copy failed.");
402 const uint32_t bytes_written = process_sp->WriteMemory (dst_addr, dst, bytes_copied, error);
403 if (bytes_written != bytes_copied)
407 // This might happen if we read _some_ bytes but not all
408 error.SetErrorStringWithFormat("only wrote %u of %u bytes", bytes_written, bytes_copied);
415 error.SetErrorString("invalid process");
422 RegisterContext::CalculateTarget ()
424 return m_thread.CalculateTarget();
429 RegisterContext::CalculateProcess ()
431 return m_thread.CalculateProcess ();
435 RegisterContext::CalculateThread ()
437 return m_thread.shared_from_this();
441 RegisterContext::CalculateStackFrame ()
443 // Register contexts might belong to many frames if we have inlined
444 // functions inside a frame since all inlined functions share the
445 // same registers, so we can't definitively say which frame we come from...
446 return StackFrameSP();
450 RegisterContext::CalculateExecutionContext (ExecutionContext &exe_ctx)
452 m_thread.CalculateExecutionContext (exe_ctx);
457 RegisterContext::ConvertBetweenRegisterKinds (int source_rk, uint32_t source_regnum, int target_rk, uint32_t& target_regnum)
459 const uint32_t num_registers = GetRegisterCount();
460 for (uint32_t reg = 0; reg < num_registers; ++reg)
462 const RegisterInfo * reg_info = GetRegisterInfoAtIndex (reg);
464 if (reg_info->kinds[source_rk] == source_regnum)
466 target_regnum = reg_info->kinds[target_rk];
467 if (target_regnum == LLDB_INVALID_REGNUM)
481 //RegisterContext::ReadRegisterValue (uint32_t reg, Scalar &value)
483 // DataExtractor data;
484 // if (!ReadRegisterBytes (reg, data))
487 // const RegisterInfo *reg_info = GetRegisterInfoAtIndex (reg);
488 // uint32_t offset = 0;
489 // switch (reg_info->encoding)
491 // case eEncodingInvalid:
492 // case eEncodingVector:
495 // case eEncodingUint:
496 // switch (reg_info->byte_size)
500 // value = data.GetU8 (&offset);
505 // value = data.GetU16 (&offset);
510 // value = data.GetU32 (&offset);
515 // value = data.GetU64 (&offset);
520 // case eEncodingSint:
521 // switch (reg_info->byte_size)
526 // if (data.ExtractBytes (0, sizeof (int8_t), lldb::endian::InlHostByteOrder(), &v) != sizeof (int8_t))
534 // if (data.ExtractBytes (0, sizeof (int16_t), lldb::endian::InlHostByteOrder(), &v) != sizeof (int16_t))
542 // if (data.ExtractBytes (0, sizeof (int32_t), lldb::endian::InlHostByteOrder(), &v) != sizeof (int32_t))
550 // if (data.ExtractBytes (0, sizeof (int64_t), lldb::endian::InlHostByteOrder(), &v) != sizeof (int64_t))
557 // case eEncodingIEEE754:
558 // switch (reg_info->byte_size)
560 // case sizeof (float):
563 // if (data.ExtractBytes (0, sizeof (float), lldb::endian::InlHostByteOrder(), &v) != sizeof (float))
568 // case sizeof (double):
571 // if (data.ExtractBytes (0, sizeof (double), lldb::endian::InlHostByteOrder(), &v) != sizeof (double))
576 // case sizeof (long double):
579 // if (data.ExtractBytes (0, sizeof (long double), lldb::endian::InlHostByteOrder(), &v) != sizeof (long double))
591 //RegisterContext::WriteRegisterValue (uint32_t reg, const Scalar &value)
593 // DataExtractor data;
594 // if (!value.IsValid())
596 // if (!value.GetData (data))
599 // return WriteRegisterBytes (reg, data);