llvm-project/lldb/source/Core/EmulateInstruction.cpp

673 lines
21 KiB
C++

//===-- EmulateInstruction.h ------------------------------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "lldb/Core/EmulateInstruction.h"
#include "lldb/Core/Address.h"
#include "lldb/Core/DataExtractor.h"
#include "lldb/Core/Error.h"
#include "lldb/Core/PluginManager.h"
#include "lldb/Core/RegisterValue.h"
#include "lldb/Core/StreamFile.h"
#include "lldb/Core/StreamString.h"
#include "lldb/Host/Endian.h"
#include "lldb/Symbol/UnwindPlan.h"
#include "lldb/Target/Process.h"
#include "lldb/Target/RegisterContext.h"
#include "lldb/Target/Target.h"
#include "lldb/Target/Thread.h"
using namespace lldb;
using namespace lldb_private;
EmulateInstruction*
EmulateInstruction::FindPlugin (const ArchSpec &arch, InstructionType supported_inst_type, const char *plugin_name)
{
EmulateInstructionCreateInstance create_callback = NULL;
if (plugin_name)
{
ConstString const_plugin_name (plugin_name);
create_callback = PluginManager::GetEmulateInstructionCreateCallbackForPluginName (const_plugin_name);
if (create_callback)
{
EmulateInstruction *emulate_insn_ptr = create_callback(arch, supported_inst_type);
if (emulate_insn_ptr)
return emulate_insn_ptr;
}
}
else
{
for (uint32_t idx = 0; (create_callback = PluginManager::GetEmulateInstructionCreateCallbackAtIndex(idx)) != NULL; ++idx)
{
EmulateInstruction *emulate_insn_ptr = create_callback(arch, supported_inst_type);
if (emulate_insn_ptr)
return emulate_insn_ptr;
}
}
return NULL;
}
EmulateInstruction::EmulateInstruction (const ArchSpec &arch) :
m_arch (arch),
m_baton (NULL),
m_read_mem_callback (&ReadMemoryDefault),
m_write_mem_callback (&WriteMemoryDefault),
m_read_reg_callback (&ReadRegisterDefault),
m_write_reg_callback (&WriteRegisterDefault),
m_addr (LLDB_INVALID_ADDRESS)
{
::memset (&m_opcode, 0, sizeof (m_opcode));
}
bool
EmulateInstruction::ReadRegister (const RegisterInfo *reg_info, RegisterValue& reg_value)
{
if (m_read_reg_callback)
return m_read_reg_callback (this, m_baton, reg_info, reg_value);
return false;
}
bool
EmulateInstruction::ReadRegister (lldb::RegisterKind reg_kind, uint32_t reg_num, RegisterValue& reg_value)
{
RegisterInfo reg_info;
if (GetRegisterInfo(reg_kind, reg_num, reg_info))
return ReadRegister (&reg_info, reg_value);
return false;
}
uint64_t
EmulateInstruction::ReadRegisterUnsigned (lldb::RegisterKind reg_kind,
uint32_t reg_num,
uint64_t fail_value,
bool *success_ptr)
{
RegisterValue reg_value;
if (ReadRegister (reg_kind, reg_num, reg_value))
return reg_value.GetAsUInt64(fail_value, success_ptr);
if (success_ptr)
*success_ptr = false;
return fail_value;
}
uint64_t
EmulateInstruction::ReadRegisterUnsigned (const RegisterInfo *reg_info,
uint64_t fail_value,
bool *success_ptr)
{
RegisterValue reg_value;
if (ReadRegister (reg_info, reg_value))
return reg_value.GetAsUInt64(fail_value, success_ptr);
if (success_ptr)
*success_ptr = false;
return fail_value;
}
bool
EmulateInstruction::WriteRegister (const Context &context,
const RegisterInfo *reg_info,
const RegisterValue& reg_value)
{
if (m_write_reg_callback)
return m_write_reg_callback (this, m_baton, context, reg_info, reg_value);
return false;
}
bool
EmulateInstruction::WriteRegister (const Context &context,
lldb::RegisterKind reg_kind,
uint32_t reg_num,
const RegisterValue& reg_value)
{
RegisterInfo reg_info;
if (GetRegisterInfo(reg_kind, reg_num, reg_info))
return WriteRegister (context, &reg_info, reg_value);
return false;
}
bool
EmulateInstruction::WriteRegisterUnsigned (const Context &context,
lldb::RegisterKind reg_kind,
uint32_t reg_num,
uint64_t uint_value)
{
RegisterInfo reg_info;
if (GetRegisterInfo(reg_kind, reg_num, reg_info))
{
RegisterValue reg_value;
if (reg_value.SetUInt(uint_value, reg_info.byte_size))
return WriteRegister (context, &reg_info, reg_value);
}
return false;
}
bool
EmulateInstruction::WriteRegisterUnsigned (const Context &context,
const RegisterInfo *reg_info,
uint64_t uint_value)
{
if (reg_info)
{
RegisterValue reg_value;
if (reg_value.SetUInt(uint_value, reg_info->byte_size))
return WriteRegister (context, reg_info, reg_value);
}
return false;
}
size_t
EmulateInstruction::ReadMemory (const Context &context,
lldb::addr_t addr,
void *dst,
size_t dst_len)
{
if (m_read_mem_callback)
return m_read_mem_callback (this, m_baton, context, addr, dst, dst_len) == dst_len;
return false;
}
uint64_t
EmulateInstruction::ReadMemoryUnsigned (const Context &context, lldb::addr_t addr, size_t byte_size, uint64_t fail_value, bool *success_ptr)
{
uint64_t uval64 = 0;
bool success = false;
if (byte_size <= 8)
{
uint8_t buf[sizeof(uint64_t)];
size_t bytes_read = m_read_mem_callback (this, m_baton, context, addr, buf, byte_size);
if (bytes_read == byte_size)
{
lldb::offset_t offset = 0;
DataExtractor data (buf, byte_size, GetByteOrder(), GetAddressByteSize());
uval64 = data.GetMaxU64 (&offset, byte_size);
success = true;
}
}
if (success_ptr)
*success_ptr = success;
if (!success)
uval64 = fail_value;
return uval64;
}
bool
EmulateInstruction::WriteMemoryUnsigned (const Context &context,
lldb::addr_t addr,
uint64_t uval,
size_t uval_byte_size)
{
StreamString strm(Stream::eBinary, GetAddressByteSize(), GetByteOrder());
strm.PutMaxHex64 (uval, uval_byte_size);
size_t bytes_written = m_write_mem_callback (this, m_baton, context, addr, strm.GetData(), uval_byte_size);
if (bytes_written == uval_byte_size)
return true;
return false;
}
bool
EmulateInstruction::WriteMemory (const Context &context,
lldb::addr_t addr,
const void *src,
size_t src_len)
{
if (m_write_mem_callback)
return m_write_mem_callback (this, m_baton, context, addr, src, src_len) == src_len;
return false;
}
void
EmulateInstruction::SetBaton (void *baton)
{
m_baton = baton;
}
void
EmulateInstruction::SetCallbacks (ReadMemoryCallback read_mem_callback,
WriteMemoryCallback write_mem_callback,
ReadRegisterCallback read_reg_callback,
WriteRegisterCallback write_reg_callback)
{
m_read_mem_callback = read_mem_callback;
m_write_mem_callback = write_mem_callback;
m_read_reg_callback = read_reg_callback;
m_write_reg_callback = write_reg_callback;
}
void
EmulateInstruction::SetReadMemCallback (ReadMemoryCallback read_mem_callback)
{
m_read_mem_callback = read_mem_callback;
}
void
EmulateInstruction::SetWriteMemCallback (WriteMemoryCallback write_mem_callback)
{
m_write_mem_callback = write_mem_callback;
}
void
EmulateInstruction::SetReadRegCallback (ReadRegisterCallback read_reg_callback)
{
m_read_reg_callback = read_reg_callback;
}
void
EmulateInstruction::SetWriteRegCallback (WriteRegisterCallback write_reg_callback)
{
m_write_reg_callback = write_reg_callback;
}
//
// Read & Write Memory and Registers callback functions.
//
size_t
EmulateInstruction::ReadMemoryFrame (EmulateInstruction *instruction,
void *baton,
const Context &context,
lldb::addr_t addr,
void *dst,
size_t dst_len)
{
if (!baton || dst == NULL || dst_len == 0)
return 0;
StackFrame *frame = (StackFrame *) baton;
ProcessSP process_sp (frame->CalculateProcess());
if (process_sp)
{
Error error;
return process_sp->ReadMemory (addr, dst, dst_len, error);
}
return 0;
}
size_t
EmulateInstruction::WriteMemoryFrame (EmulateInstruction *instruction,
void *baton,
const Context &context,
lldb::addr_t addr,
const void *src,
size_t src_len)
{
if (!baton || src == NULL || src_len == 0)
return 0;
StackFrame *frame = (StackFrame *) baton;
ProcessSP process_sp (frame->CalculateProcess());
if (process_sp)
{
Error error;
return process_sp->WriteMemory (addr, src, src_len, error);
}
return 0;
}
bool
EmulateInstruction::ReadRegisterFrame (EmulateInstruction *instruction,
void *baton,
const RegisterInfo *reg_info,
RegisterValue &reg_value)
{
if (!baton)
return false;
StackFrame *frame = (StackFrame *) baton;
return frame->GetRegisterContext()->ReadRegister (reg_info, reg_value);
}
bool
EmulateInstruction::WriteRegisterFrame (EmulateInstruction *instruction,
void *baton,
const Context &context,
const RegisterInfo *reg_info,
const RegisterValue &reg_value)
{
if (!baton)
return false;
StackFrame *frame = (StackFrame *) baton;
return frame->GetRegisterContext()->WriteRegister (reg_info, reg_value);
}
size_t
EmulateInstruction::ReadMemoryDefault (EmulateInstruction *instruction,
void *baton,
const Context &context,
lldb::addr_t addr,
void *dst,
size_t length)
{
StreamFile strm (stdout, false);
strm.Printf (" Read from Memory (address = 0x%" PRIx64 ", length = %" PRIu64 ", context = ", addr, (uint64_t)length);
context.Dump (strm, instruction);
strm.EOL();
*((uint64_t *) dst) = 0xdeadbeef;
return length;
}
size_t
EmulateInstruction::WriteMemoryDefault (EmulateInstruction *instruction,
void *baton,
const Context &context,
lldb::addr_t addr,
const void *dst,
size_t length)
{
StreamFile strm (stdout, false);
strm.Printf (" Write to Memory (address = 0x%" PRIx64 ", length = %" PRIu64 ", context = ", addr, (uint64_t)length);
context.Dump (strm, instruction);
strm.EOL();
return length;
}
bool
EmulateInstruction::ReadRegisterDefault (EmulateInstruction *instruction,
void *baton,
const RegisterInfo *reg_info,
RegisterValue &reg_value)
{
StreamFile strm (stdout, false);
strm.Printf (" Read Register (%s)\n", reg_info->name);
lldb::RegisterKind reg_kind;
uint32_t reg_num;
if (GetBestRegisterKindAndNumber (reg_info, reg_kind, reg_num))
reg_value.SetUInt64((uint64_t)reg_kind << 24 | reg_num);
else
reg_value.SetUInt64(0);
return true;
}
bool
EmulateInstruction::WriteRegisterDefault (EmulateInstruction *instruction,
void *baton,
const Context &context,
const RegisterInfo *reg_info,
const RegisterValue &reg_value)
{
StreamFile strm (stdout, false);
strm.Printf (" Write to Register (name = %s, value = " , reg_info->name);
reg_value.Dump(&strm, reg_info, false, false, eFormatDefault);
strm.PutCString (", context = ");
context.Dump (strm, instruction);
strm.EOL();
return true;
}
void
EmulateInstruction::Context::Dump (Stream &strm,
EmulateInstruction *instruction) const
{
switch (type)
{
case eContextReadOpcode:
strm.PutCString ("reading opcode");
break;
case eContextImmediate:
strm.PutCString ("immediate");
break;
case eContextPushRegisterOnStack:
strm.PutCString ("push register");
break;
case eContextPopRegisterOffStack:
strm.PutCString ("pop register");
break;
case eContextAdjustStackPointer:
strm.PutCString ("adjust sp");
break;
case eContextSetFramePointer:
strm.PutCString ("set frame pointer");
break;
case eContextAdjustBaseRegister:
strm.PutCString ("adjusting (writing value back to) a base register");
break;
case eContextRegisterPlusOffset:
strm.PutCString ("register + offset");
break;
case eContextRegisterStore:
strm.PutCString ("store register");
break;
case eContextRegisterLoad:
strm.PutCString ("load register");
break;
case eContextRelativeBranchImmediate:
strm.PutCString ("relative branch immediate");
break;
case eContextAbsoluteBranchRegister:
strm.PutCString ("absolute branch register");
break;
case eContextSupervisorCall:
strm.PutCString ("supervisor call");
break;
case eContextTableBranchReadMemory:
strm.PutCString ("table branch read memory");
break;
case eContextWriteRegisterRandomBits:
strm.PutCString ("write random bits to a register");
break;
case eContextWriteMemoryRandomBits:
strm.PutCString ("write random bits to a memory address");
break;
case eContextArithmetic:
strm.PutCString ("arithmetic");
break;
case eContextReturnFromException:
strm.PutCString ("return from exception");
break;
default:
strm.PutCString ("unrecognized context.");
break;
}
switch (info_type)
{
case eInfoTypeRegisterPlusOffset:
{
strm.Printf (" (reg_plus_offset = %s%+" PRId64 ")",
info.RegisterPlusOffset.reg.name,
info.RegisterPlusOffset.signed_offset);
}
break;
case eInfoTypeRegisterPlusIndirectOffset:
{
strm.Printf (" (reg_plus_reg = %s + %s)",
info.RegisterPlusIndirectOffset.base_reg.name,
info.RegisterPlusIndirectOffset.offset_reg.name);
}
break;
case eInfoTypeRegisterToRegisterPlusOffset:
{
strm.Printf (" (base_and_imm_offset = %s%+" PRId64 ", data_reg = %s)",
info.RegisterToRegisterPlusOffset.base_reg.name,
info.RegisterToRegisterPlusOffset.offset,
info.RegisterToRegisterPlusOffset.data_reg.name);
}
break;
case eInfoTypeRegisterToRegisterPlusIndirectOffset:
{
strm.Printf (" (base_and_reg_offset = %s + %s, data_reg = %s)",
info.RegisterToRegisterPlusIndirectOffset.base_reg.name,
info.RegisterToRegisterPlusIndirectOffset.offset_reg.name,
info.RegisterToRegisterPlusIndirectOffset.data_reg.name);
}
break;
case eInfoTypeRegisterRegisterOperands:
{
strm.Printf (" (register to register binary op: %s and %s)",
info.RegisterRegisterOperands.operand1.name,
info.RegisterRegisterOperands.operand2.name);
}
break;
case eInfoTypeOffset:
strm.Printf (" (signed_offset = %+" PRId64 ")", info.signed_offset);
break;
case eInfoTypeRegister:
strm.Printf (" (reg = %s)", info.reg.name);
break;
case eInfoTypeImmediate:
strm.Printf (" (unsigned_immediate = %" PRIu64 " (0x%16.16" PRIx64 "))",
info.unsigned_immediate,
info.unsigned_immediate);
break;
case eInfoTypeImmediateSigned:
strm.Printf (" (signed_immediate = %+" PRId64 " (0x%16.16" PRIx64 "))",
info.signed_immediate,
info.signed_immediate);
break;
case eInfoTypeAddress:
strm.Printf (" (address = 0x%" PRIx64 ")", info.address);
break;
case eInfoTypeISAAndImmediate:
strm.Printf (" (isa = %u, unsigned_immediate = %u (0x%8.8x))",
info.ISAAndImmediate.isa,
info.ISAAndImmediate.unsigned_data32,
info.ISAAndImmediate.unsigned_data32);
break;
case eInfoTypeISAAndImmediateSigned:
strm.Printf (" (isa = %u, signed_immediate = %i (0x%8.8x))",
info.ISAAndImmediateSigned.isa,
info.ISAAndImmediateSigned.signed_data32,
info.ISAAndImmediateSigned.signed_data32);
break;
case eInfoTypeISA:
strm.Printf (" (isa = %u)", info.isa);
break;
case eInfoTypeNoArgs:
break;
}
}
bool
EmulateInstruction::SetInstruction (const Opcode &opcode, const Address &inst_addr, Target *target)
{
m_opcode = opcode;
m_addr = LLDB_INVALID_ADDRESS;
if (inst_addr.IsValid())
{
if (target)
m_addr = inst_addr.GetLoadAddress (target);
if (m_addr == LLDB_INVALID_ADDRESS)
m_addr = inst_addr.GetFileAddress ();
}
return true;
}
bool
EmulateInstruction::GetBestRegisterKindAndNumber (const RegisterInfo *reg_info,
lldb::RegisterKind &reg_kind,
uint32_t &reg_num)
{
// Generic and DWARF should be the two most popular register kinds when
// emulating instructions since they are the most platform agnostic...
reg_num = reg_info->kinds[eRegisterKindGeneric];
if (reg_num != LLDB_INVALID_REGNUM)
{
reg_kind = eRegisterKindGeneric;
return true;
}
reg_num = reg_info->kinds[eRegisterKindDWARF];
if (reg_num != LLDB_INVALID_REGNUM)
{
reg_kind = eRegisterKindDWARF;
return true;
}
reg_num = reg_info->kinds[eRegisterKindLLDB];
if (reg_num != LLDB_INVALID_REGNUM)
{
reg_kind = eRegisterKindLLDB;
return true;
}
reg_num = reg_info->kinds[eRegisterKindEHFrame];
if (reg_num != LLDB_INVALID_REGNUM)
{
reg_kind = eRegisterKindEHFrame;
return true;
}
reg_num = reg_info->kinds[eRegisterKindStabs];
if (reg_num != LLDB_INVALID_REGNUM)
{
reg_kind = eRegisterKindStabs;
return true;
}
return false;
}
uint32_t
EmulateInstruction::GetInternalRegisterNumber (RegisterContext *reg_ctx, const RegisterInfo &reg_info)
{
lldb::RegisterKind reg_kind;
uint32_t reg_num;
if (reg_ctx && GetBestRegisterKindAndNumber (&reg_info, reg_kind, reg_num))
return reg_ctx->ConvertRegisterKindToRegisterNumber (reg_kind, reg_num);
return LLDB_INVALID_REGNUM;
}
bool
EmulateInstruction::CreateFunctionEntryUnwind (UnwindPlan &unwind_plan)
{
unwind_plan.Clear();
return false;
}