e03334cf6a
Summary: The dump function was the only part of this class which depended on high-level functionality. This was due to the DumpDataExtractor function, which uses info from a running target to control dump format (although, RegisterValue doesn't really use the high-level part of DumpDataExtractor). This patch follows the same approach done for the DataExtractor class, and extracts the dumping code into a separate function/file. This file can stay in the higher level code, while the RegisterValue class and anything that does not depend in dumping can stay go to lower layers. The XCode project will need to be updated after this patch. Reviewers: zturner, jingham, clayborg Subscribers: lldb-commits, mgorny Differential Revision: https://reviews.llvm.org/D48351 llvm-svn: 337832
662 lines
27 KiB
C++
662 lines
27 KiB
C++
//===-- UnwindAssemblyInstEmulation.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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#include "UnwindAssemblyInstEmulation.h"
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#include "lldb/Core/Address.h"
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#include "lldb/Core/Disassembler.h"
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#include "lldb/Core/DumpDataExtractor.h"
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#include "lldb/Core/DumpRegisterValue.h"
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#include "lldb/Core/FormatEntity.h"
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#include "lldb/Core/PluginManager.h"
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#include "lldb/Target/ExecutionContext.h"
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#include "lldb/Target/Process.h"
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#include "lldb/Target/Target.h"
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#include "lldb/Target/Thread.h"
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#include "lldb/Utility/ArchSpec.h"
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#include "lldb/Utility/DataBufferHeap.h"
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#include "lldb/Utility/DataExtractor.h"
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#include "lldb/Utility/Log.h"
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#include "lldb/Utility/Status.h"
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#include "lldb/Utility/StreamString.h"
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using namespace lldb;
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using namespace lldb_private;
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//-----------------------------------------------------------------------------------------------
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// UnwindAssemblyInstEmulation method definitions
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//-----------------------------------------------------------------------------------------------
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bool UnwindAssemblyInstEmulation::GetNonCallSiteUnwindPlanFromAssembly(
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AddressRange &range, Thread &thread, UnwindPlan &unwind_plan) {
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std::vector<uint8_t> function_text(range.GetByteSize());
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ProcessSP process_sp(thread.GetProcess());
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if (process_sp) {
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Status error;
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const bool prefer_file_cache = true;
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if (process_sp->GetTarget().ReadMemory(
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range.GetBaseAddress(), prefer_file_cache, function_text.data(),
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range.GetByteSize(), error) != range.GetByteSize()) {
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return false;
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}
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}
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return GetNonCallSiteUnwindPlanFromAssembly(
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range, function_text.data(), function_text.size(), unwind_plan);
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}
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bool UnwindAssemblyInstEmulation::GetNonCallSiteUnwindPlanFromAssembly(
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AddressRange &range, uint8_t *opcode_data, size_t opcode_size,
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UnwindPlan &unwind_plan) {
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if (opcode_data == nullptr || opcode_size == 0)
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return false;
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if (range.GetByteSize() > 0 && range.GetBaseAddress().IsValid() &&
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m_inst_emulator_ap.get()) {
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// The instruction emulation subclass setup the unwind plan for the first
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// instruction.
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m_inst_emulator_ap->CreateFunctionEntryUnwind(unwind_plan);
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// CreateFunctionEntryUnwind should have created the first row. If it
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// doesn't, then we are done.
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if (unwind_plan.GetRowCount() == 0)
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return false;
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const bool prefer_file_cache = true;
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DisassemblerSP disasm_sp(Disassembler::DisassembleBytes(
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m_arch, NULL, NULL, range.GetBaseAddress(), opcode_data, opcode_size,
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99999, prefer_file_cache));
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Log *log(GetLogIfAllCategoriesSet(LIBLLDB_LOG_UNWIND));
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if (disasm_sp) {
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m_range_ptr = ⦥
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m_unwind_plan_ptr = &unwind_plan;
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const uint32_t addr_byte_size = m_arch.GetAddressByteSize();
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const bool show_address = true;
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const bool show_bytes = true;
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m_inst_emulator_ap->GetRegisterInfo(unwind_plan.GetRegisterKind(),
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unwind_plan.GetInitialCFARegister(),
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m_cfa_reg_info);
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m_fp_is_cfa = false;
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m_register_values.clear();
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m_pushed_regs.clear();
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// Initialize the CFA with a known value. In the 32 bit case it will be
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// 0x80000000, and in the 64 bit case 0x8000000000000000. We use the
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// address byte size to be safe for any future address sizes
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m_initial_sp = (1ull << ((addr_byte_size * 8) - 1));
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RegisterValue cfa_reg_value;
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cfa_reg_value.SetUInt(m_initial_sp, m_cfa_reg_info.byte_size);
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SetRegisterValue(m_cfa_reg_info, cfa_reg_value);
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const InstructionList &inst_list = disasm_sp->GetInstructionList();
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const size_t num_instructions = inst_list.GetSize();
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if (num_instructions > 0) {
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Instruction *inst = inst_list.GetInstructionAtIndex(0).get();
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const lldb::addr_t base_addr = inst->GetAddress().GetFileAddress();
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// Map for storing the unwind plan row and the value of the registers
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// at a given offset. When we see a forward branch we add a new entry
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// to this map with the actual unwind plan row and register context for
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// the target address of the branch as the current data have to be
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// valid for the target address of the branch too if we are in the same
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// function.
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std::map<lldb::addr_t, std::pair<UnwindPlan::RowSP, RegisterValueMap>>
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saved_unwind_states;
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// Make a copy of the current instruction Row and save it in m_curr_row
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// so we can add updates as we process the instructions.
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UnwindPlan::RowSP last_row = unwind_plan.GetLastRow();
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UnwindPlan::Row *newrow = new UnwindPlan::Row;
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if (last_row.get())
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*newrow = *last_row.get();
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m_curr_row.reset(newrow);
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// Add the initial state to the save list with offset 0.
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saved_unwind_states.insert({0, {last_row, m_register_values}});
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// cache the pc register number (in whatever register numbering this
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// UnwindPlan uses) for quick reference during instruction parsing.
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RegisterInfo pc_reg_info;
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m_inst_emulator_ap->GetRegisterInfo(
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eRegisterKindGeneric, LLDB_REGNUM_GENERIC_PC, pc_reg_info);
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// cache the return address register number (in whatever register
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// numbering this UnwindPlan uses) for quick reference during
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// instruction parsing.
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RegisterInfo ra_reg_info;
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m_inst_emulator_ap->GetRegisterInfo(
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eRegisterKindGeneric, LLDB_REGNUM_GENERIC_RA, ra_reg_info);
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// The architecture dependent condition code of the last processed
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// instruction.
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EmulateInstruction::InstructionCondition last_condition =
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EmulateInstruction::UnconditionalCondition;
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lldb::addr_t condition_block_start_offset = 0;
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for (size_t idx = 0; idx < num_instructions; ++idx) {
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m_curr_row_modified = false;
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m_forward_branch_offset = 0;
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inst = inst_list.GetInstructionAtIndex(idx).get();
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if (inst) {
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lldb::addr_t current_offset =
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inst->GetAddress().GetFileAddress() - base_addr;
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auto it = saved_unwind_states.upper_bound(current_offset);
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assert(it != saved_unwind_states.begin() &&
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"Unwind row for the function entry missing");
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--it; // Move it to the row corresponding to the current offset
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// If the offset of m_curr_row don't match with the offset we see
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// in saved_unwind_states then we have to update m_curr_row and
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// m_register_values based on the saved values. It is happening
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// after we processed an epilogue and a return to caller
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// instruction.
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if (it->second.first->GetOffset() != m_curr_row->GetOffset()) {
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UnwindPlan::Row *newrow = new UnwindPlan::Row;
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*newrow = *it->second.first;
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m_curr_row.reset(newrow);
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m_register_values = it->second.second;
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}
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m_inst_emulator_ap->SetInstruction(inst->GetOpcode(),
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inst->GetAddress(), nullptr);
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if (last_condition !=
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m_inst_emulator_ap->GetInstructionCondition()) {
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if (m_inst_emulator_ap->GetInstructionCondition() !=
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EmulateInstruction::UnconditionalCondition &&
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saved_unwind_states.count(current_offset) == 0) {
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// If we don't have a saved row for the current offset then
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// save our current state because we will have to restore it
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// after the conditional block.
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auto new_row =
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std::make_shared<UnwindPlan::Row>(*m_curr_row.get());
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saved_unwind_states.insert(
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{current_offset, {new_row, m_register_values}});
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}
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// If the last instruction was conditional with a different
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// condition then the then current condition then restore the
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// condition.
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if (last_condition !=
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EmulateInstruction::UnconditionalCondition) {
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const auto &saved_state =
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saved_unwind_states.at(condition_block_start_offset);
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m_curr_row =
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std::make_shared<UnwindPlan::Row>(*saved_state.first);
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m_curr_row->SetOffset(current_offset);
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m_register_values = saved_state.second;
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bool replace_existing =
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true; // The last instruction might already
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// created a row for this offset and
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// we want to overwrite it.
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unwind_plan.InsertRow(
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std::make_shared<UnwindPlan::Row>(*m_curr_row),
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replace_existing);
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}
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// We are starting a new conditional block at the actual offset
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condition_block_start_offset = current_offset;
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}
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if (log && log->GetVerbose()) {
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StreamString strm;
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lldb_private::FormatEntity::Entry format;
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FormatEntity::Parse("${frame.pc}: ", format);
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inst->Dump(&strm, inst_list.GetMaxOpcocdeByteSize(), show_address,
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show_bytes, NULL, NULL, NULL, &format, 0);
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log->PutString(strm.GetString());
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}
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last_condition = m_inst_emulator_ap->GetInstructionCondition();
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m_inst_emulator_ap->EvaluateInstruction(
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eEmulateInstructionOptionIgnoreConditions);
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// If the current instruction is a branch forward then save the
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// current CFI information for the offset where we are branching.
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if (m_forward_branch_offset != 0 &&
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range.ContainsFileAddress(inst->GetAddress().GetFileAddress() +
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m_forward_branch_offset)) {
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auto newrow =
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std::make_shared<UnwindPlan::Row>(*m_curr_row.get());
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newrow->SetOffset(current_offset + m_forward_branch_offset);
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saved_unwind_states.insert(
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{current_offset + m_forward_branch_offset,
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{newrow, m_register_values}});
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unwind_plan.InsertRow(newrow);
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}
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// Were there any changes to the CFI while evaluating this
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// instruction?
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if (m_curr_row_modified) {
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// Save the modified row if we don't already have a CFI row in
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// the current address
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if (saved_unwind_states.count(
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current_offset + inst->GetOpcode().GetByteSize()) == 0) {
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m_curr_row->SetOffset(current_offset +
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inst->GetOpcode().GetByteSize());
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unwind_plan.InsertRow(m_curr_row);
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saved_unwind_states.insert(
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{current_offset + inst->GetOpcode().GetByteSize(),
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{m_curr_row, m_register_values}});
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// Allocate a new Row for m_curr_row, copy the current state
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// into it
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UnwindPlan::Row *newrow = new UnwindPlan::Row;
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*newrow = *m_curr_row.get();
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m_curr_row.reset(newrow);
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}
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}
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}
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}
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}
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}
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if (log && log->GetVerbose()) {
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StreamString strm;
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lldb::addr_t base_addr = range.GetBaseAddress().GetFileAddress();
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strm.Printf("Resulting unwind rows for [0x%" PRIx64 " - 0x%" PRIx64 "):",
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base_addr, base_addr + range.GetByteSize());
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unwind_plan.Dump(strm, nullptr, base_addr);
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log->PutString(strm.GetString());
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}
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return unwind_plan.GetRowCount() > 0;
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}
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return false;
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}
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bool UnwindAssemblyInstEmulation::AugmentUnwindPlanFromCallSite(
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AddressRange &func, Thread &thread, UnwindPlan &unwind_plan) {
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return false;
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}
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bool UnwindAssemblyInstEmulation::GetFastUnwindPlan(AddressRange &func,
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Thread &thread,
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UnwindPlan &unwind_plan) {
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return false;
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}
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bool UnwindAssemblyInstEmulation::FirstNonPrologueInsn(
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AddressRange &func, const ExecutionContext &exe_ctx,
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Address &first_non_prologue_insn) {
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return false;
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}
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UnwindAssembly *
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UnwindAssemblyInstEmulation::CreateInstance(const ArchSpec &arch) {
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std::unique_ptr<EmulateInstruction> inst_emulator_ap(
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EmulateInstruction::FindPlugin(arch, eInstructionTypePrologueEpilogue,
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NULL));
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// Make sure that all prologue instructions are handled
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if (inst_emulator_ap.get())
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return new UnwindAssemblyInstEmulation(arch, inst_emulator_ap.release());
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return NULL;
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}
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//------------------------------------------------------------------
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// PluginInterface protocol in UnwindAssemblyParser_x86
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//------------------------------------------------------------------
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ConstString UnwindAssemblyInstEmulation::GetPluginName() {
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return GetPluginNameStatic();
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}
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uint32_t UnwindAssemblyInstEmulation::GetPluginVersion() { return 1; }
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void UnwindAssemblyInstEmulation::Initialize() {
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PluginManager::RegisterPlugin(GetPluginNameStatic(),
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GetPluginDescriptionStatic(), CreateInstance);
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}
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void UnwindAssemblyInstEmulation::Terminate() {
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PluginManager::UnregisterPlugin(CreateInstance);
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}
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ConstString UnwindAssemblyInstEmulation::GetPluginNameStatic() {
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static ConstString g_name("inst-emulation");
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return g_name;
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}
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const char *UnwindAssemblyInstEmulation::GetPluginDescriptionStatic() {
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return "Instruction emulation based unwind information.";
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}
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uint64_t UnwindAssemblyInstEmulation::MakeRegisterKindValuePair(
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const RegisterInfo ®_info) {
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lldb::RegisterKind reg_kind;
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uint32_t reg_num;
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if (EmulateInstruction::GetBestRegisterKindAndNumber(®_info, reg_kind,
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reg_num))
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return (uint64_t)reg_kind << 24 | reg_num;
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return 0ull;
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}
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void UnwindAssemblyInstEmulation::SetRegisterValue(
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const RegisterInfo ®_info, const RegisterValue ®_value) {
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m_register_values[MakeRegisterKindValuePair(reg_info)] = reg_value;
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}
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bool UnwindAssemblyInstEmulation::GetRegisterValue(const RegisterInfo ®_info,
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RegisterValue ®_value) {
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const uint64_t reg_id = MakeRegisterKindValuePair(reg_info);
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RegisterValueMap::const_iterator pos = m_register_values.find(reg_id);
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if (pos != m_register_values.end()) {
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reg_value = pos->second;
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return true; // We had a real value that comes from an opcode that wrote
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// to it...
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}
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// We are making up a value that is recognizable...
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reg_value.SetUInt(reg_id, reg_info.byte_size);
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return false;
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}
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size_t UnwindAssemblyInstEmulation::ReadMemory(
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EmulateInstruction *instruction, void *baton,
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const EmulateInstruction::Context &context, lldb::addr_t addr, void *dst,
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size_t dst_len) {
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Log *log(GetLogIfAllCategoriesSet(LIBLLDB_LOG_UNWIND));
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if (log && log->GetVerbose()) {
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StreamString strm;
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strm.Printf(
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"UnwindAssemblyInstEmulation::ReadMemory (addr = 0x%16.16" PRIx64
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", dst = %p, dst_len = %" PRIu64 ", context = ",
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addr, dst, (uint64_t)dst_len);
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context.Dump(strm, instruction);
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log->PutString(strm.GetString());
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}
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memset(dst, 0, dst_len);
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return dst_len;
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}
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size_t UnwindAssemblyInstEmulation::WriteMemory(
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EmulateInstruction *instruction, void *baton,
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const EmulateInstruction::Context &context, lldb::addr_t addr,
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const void *dst, size_t dst_len) {
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if (baton && dst && dst_len)
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return ((UnwindAssemblyInstEmulation *)baton)
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->WriteMemory(instruction, context, addr, dst, dst_len);
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return 0;
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}
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size_t UnwindAssemblyInstEmulation::WriteMemory(
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EmulateInstruction *instruction, const EmulateInstruction::Context &context,
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lldb::addr_t addr, const void *dst, size_t dst_len) {
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DataExtractor data(dst, dst_len,
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instruction->GetArchitecture().GetByteOrder(),
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instruction->GetArchitecture().GetAddressByteSize());
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Log *log(GetLogIfAllCategoriesSet(LIBLLDB_LOG_UNWIND));
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if (log && log->GetVerbose()) {
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StreamString strm;
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strm.PutCString("UnwindAssemblyInstEmulation::WriteMemory (");
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DumpDataExtractor(data, &strm, 0, eFormatBytes, 1, dst_len, UINT32_MAX,
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addr, 0, 0);
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strm.PutCString(", context = ");
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context.Dump(strm, instruction);
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log->PutString(strm.GetString());
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}
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const bool cant_replace = false;
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switch (context.type) {
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default:
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case EmulateInstruction::eContextInvalid:
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case EmulateInstruction::eContextReadOpcode:
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case EmulateInstruction::eContextImmediate:
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case EmulateInstruction::eContextAdjustBaseRegister:
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case EmulateInstruction::eContextRegisterPlusOffset:
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case EmulateInstruction::eContextAdjustPC:
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case EmulateInstruction::eContextRegisterStore:
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case EmulateInstruction::eContextRegisterLoad:
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case EmulateInstruction::eContextRelativeBranchImmediate:
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case EmulateInstruction::eContextAbsoluteBranchRegister:
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case EmulateInstruction::eContextSupervisorCall:
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case EmulateInstruction::eContextTableBranchReadMemory:
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case EmulateInstruction::eContextWriteRegisterRandomBits:
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case EmulateInstruction::eContextWriteMemoryRandomBits:
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case EmulateInstruction::eContextArithmetic:
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case EmulateInstruction::eContextAdvancePC:
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case EmulateInstruction::eContextReturnFromException:
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case EmulateInstruction::eContextPopRegisterOffStack:
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case EmulateInstruction::eContextAdjustStackPointer:
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break;
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case EmulateInstruction::eContextPushRegisterOnStack: {
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uint32_t reg_num = LLDB_INVALID_REGNUM;
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uint32_t generic_regnum = LLDB_INVALID_REGNUM;
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assert(context.info_type ==
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EmulateInstruction::eInfoTypeRegisterToRegisterPlusOffset &&
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"unhandled case, add code to handle this!");
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const uint32_t unwind_reg_kind = m_unwind_plan_ptr->GetRegisterKind();
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reg_num = context.info.RegisterToRegisterPlusOffset.data_reg
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.kinds[unwind_reg_kind];
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generic_regnum = context.info.RegisterToRegisterPlusOffset.data_reg
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.kinds[eRegisterKindGeneric];
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if (reg_num != LLDB_INVALID_REGNUM &&
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generic_regnum != LLDB_REGNUM_GENERIC_SP) {
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if (m_pushed_regs.find(reg_num) == m_pushed_regs.end()) {
|
|
m_pushed_regs[reg_num] = addr;
|
|
const int32_t offset = addr - m_initial_sp;
|
|
m_curr_row->SetRegisterLocationToAtCFAPlusOffset(reg_num, offset,
|
|
cant_replace);
|
|
m_curr_row_modified = true;
|
|
}
|
|
}
|
|
} break;
|
|
}
|
|
|
|
return dst_len;
|
|
}
|
|
|
|
bool UnwindAssemblyInstEmulation::ReadRegister(EmulateInstruction *instruction,
|
|
void *baton,
|
|
const RegisterInfo *reg_info,
|
|
RegisterValue ®_value) {
|
|
|
|
if (baton && reg_info)
|
|
return ((UnwindAssemblyInstEmulation *)baton)
|
|
->ReadRegister(instruction, reg_info, reg_value);
|
|
return false;
|
|
}
|
|
bool UnwindAssemblyInstEmulation::ReadRegister(EmulateInstruction *instruction,
|
|
const RegisterInfo *reg_info,
|
|
RegisterValue ®_value) {
|
|
bool synthetic = GetRegisterValue(*reg_info, reg_value);
|
|
|
|
Log *log(GetLogIfAllCategoriesSet(LIBLLDB_LOG_UNWIND));
|
|
|
|
if (log && log->GetVerbose()) {
|
|
|
|
StreamString strm;
|
|
strm.Printf("UnwindAssemblyInstEmulation::ReadRegister (name = \"%s\") => "
|
|
"synthetic_value = %i, value = ",
|
|
reg_info->name, synthetic);
|
|
DumpRegisterValue(reg_value, &strm, reg_info, false, false, eFormatDefault);
|
|
log->PutString(strm.GetString());
|
|
}
|
|
return true;
|
|
}
|
|
|
|
bool UnwindAssemblyInstEmulation::WriteRegister(
|
|
EmulateInstruction *instruction, void *baton,
|
|
const EmulateInstruction::Context &context, const RegisterInfo *reg_info,
|
|
const RegisterValue ®_value) {
|
|
if (baton && reg_info)
|
|
return ((UnwindAssemblyInstEmulation *)baton)
|
|
->WriteRegister(instruction, context, reg_info, reg_value);
|
|
return false;
|
|
}
|
|
bool UnwindAssemblyInstEmulation::WriteRegister(
|
|
EmulateInstruction *instruction, const EmulateInstruction::Context &context,
|
|
const RegisterInfo *reg_info, const RegisterValue ®_value) {
|
|
Log *log(GetLogIfAllCategoriesSet(LIBLLDB_LOG_UNWIND));
|
|
|
|
if (log && log->GetVerbose()) {
|
|
|
|
StreamString strm;
|
|
strm.Printf(
|
|
"UnwindAssemblyInstEmulation::WriteRegister (name = \"%s\", value = ",
|
|
reg_info->name);
|
|
DumpRegisterValue(reg_value, &strm, reg_info, false, false, eFormatDefault);
|
|
strm.PutCString(", context = ");
|
|
context.Dump(strm, instruction);
|
|
log->PutString(strm.GetString());
|
|
}
|
|
|
|
SetRegisterValue(*reg_info, reg_value);
|
|
|
|
switch (context.type) {
|
|
case EmulateInstruction::eContextInvalid:
|
|
case EmulateInstruction::eContextReadOpcode:
|
|
case EmulateInstruction::eContextImmediate:
|
|
case EmulateInstruction::eContextAdjustBaseRegister:
|
|
case EmulateInstruction::eContextRegisterPlusOffset:
|
|
case EmulateInstruction::eContextAdjustPC:
|
|
case EmulateInstruction::eContextRegisterStore:
|
|
case EmulateInstruction::eContextSupervisorCall:
|
|
case EmulateInstruction::eContextTableBranchReadMemory:
|
|
case EmulateInstruction::eContextWriteRegisterRandomBits:
|
|
case EmulateInstruction::eContextWriteMemoryRandomBits:
|
|
case EmulateInstruction::eContextAdvancePC:
|
|
case EmulateInstruction::eContextReturnFromException:
|
|
case EmulateInstruction::eContextPushRegisterOnStack:
|
|
case EmulateInstruction::eContextRegisterLoad:
|
|
// {
|
|
// const uint32_t reg_num =
|
|
// reg_info->kinds[m_unwind_plan_ptr->GetRegisterKind()];
|
|
// if (reg_num != LLDB_INVALID_REGNUM)
|
|
// {
|
|
// const bool can_replace_only_if_unspecified = true;
|
|
//
|
|
// m_curr_row.SetRegisterLocationToUndefined (reg_num,
|
|
// can_replace_only_if_unspecified,
|
|
// can_replace_only_if_unspecified);
|
|
// m_curr_row_modified = true;
|
|
// }
|
|
// }
|
|
break;
|
|
|
|
case EmulateInstruction::eContextArithmetic: {
|
|
// If we adjusted the current frame pointer by a constant then adjust the
|
|
// CFA offset
|
|
// with the same amount.
|
|
lldb::RegisterKind kind = m_unwind_plan_ptr->GetRegisterKind();
|
|
if (m_fp_is_cfa && reg_info->kinds[kind] == m_cfa_reg_info.kinds[kind] &&
|
|
context.info_type == EmulateInstruction::eInfoTypeRegisterPlusOffset &&
|
|
context.info.RegisterPlusOffset.reg.kinds[kind] ==
|
|
m_cfa_reg_info.kinds[kind]) {
|
|
const int64_t offset = context.info.RegisterPlusOffset.signed_offset;
|
|
m_curr_row->GetCFAValue().IncOffset(-1 * offset);
|
|
m_curr_row_modified = true;
|
|
}
|
|
} break;
|
|
|
|
case EmulateInstruction::eContextAbsoluteBranchRegister:
|
|
case EmulateInstruction::eContextRelativeBranchImmediate: {
|
|
if (context.info_type == EmulateInstruction::eInfoTypeISAAndImmediate &&
|
|
context.info.ISAAndImmediate.unsigned_data32 > 0) {
|
|
m_forward_branch_offset =
|
|
context.info.ISAAndImmediateSigned.signed_data32;
|
|
} else if (context.info_type ==
|
|
EmulateInstruction::eInfoTypeISAAndImmediateSigned &&
|
|
context.info.ISAAndImmediateSigned.signed_data32 > 0) {
|
|
m_forward_branch_offset = context.info.ISAAndImmediate.unsigned_data32;
|
|
} else if (context.info_type == EmulateInstruction::eInfoTypeImmediate &&
|
|
context.info.unsigned_immediate > 0) {
|
|
m_forward_branch_offset = context.info.unsigned_immediate;
|
|
} else if (context.info_type ==
|
|
EmulateInstruction::eInfoTypeImmediateSigned &&
|
|
context.info.signed_immediate > 0) {
|
|
m_forward_branch_offset = context.info.signed_immediate;
|
|
}
|
|
} break;
|
|
|
|
case EmulateInstruction::eContextPopRegisterOffStack: {
|
|
const uint32_t reg_num =
|
|
reg_info->kinds[m_unwind_plan_ptr->GetRegisterKind()];
|
|
const uint32_t generic_regnum = reg_info->kinds[eRegisterKindGeneric];
|
|
if (reg_num != LLDB_INVALID_REGNUM &&
|
|
generic_regnum != LLDB_REGNUM_GENERIC_SP) {
|
|
switch (context.info_type) {
|
|
case EmulateInstruction::eInfoTypeAddress:
|
|
if (m_pushed_regs.find(reg_num) != m_pushed_regs.end() &&
|
|
context.info.address == m_pushed_regs[reg_num]) {
|
|
m_curr_row->SetRegisterLocationToSame(reg_num,
|
|
false /*must_replace*/);
|
|
m_curr_row_modified = true;
|
|
}
|
|
break;
|
|
case EmulateInstruction::eInfoTypeISA:
|
|
assert(
|
|
(generic_regnum == LLDB_REGNUM_GENERIC_PC ||
|
|
generic_regnum == LLDB_REGNUM_GENERIC_FLAGS) &&
|
|
"eInfoTypeISA used for poping a register other the the PC/FLAGS");
|
|
if (generic_regnum != LLDB_REGNUM_GENERIC_FLAGS) {
|
|
m_curr_row->SetRegisterLocationToSame(reg_num,
|
|
false /*must_replace*/);
|
|
m_curr_row_modified = true;
|
|
}
|
|
break;
|
|
default:
|
|
assert(false && "unhandled case, add code to handle this!");
|
|
break;
|
|
}
|
|
}
|
|
} break;
|
|
|
|
case EmulateInstruction::eContextSetFramePointer:
|
|
if (!m_fp_is_cfa) {
|
|
m_fp_is_cfa = true;
|
|
m_cfa_reg_info = *reg_info;
|
|
const uint32_t cfa_reg_num =
|
|
reg_info->kinds[m_unwind_plan_ptr->GetRegisterKind()];
|
|
assert(cfa_reg_num != LLDB_INVALID_REGNUM);
|
|
m_curr_row->GetCFAValue().SetIsRegisterPlusOffset(
|
|
cfa_reg_num, m_initial_sp - reg_value.GetAsUInt64());
|
|
m_curr_row_modified = true;
|
|
}
|
|
break;
|
|
|
|
case EmulateInstruction::eContextRestoreStackPointer:
|
|
if (m_fp_is_cfa) {
|
|
m_fp_is_cfa = false;
|
|
m_cfa_reg_info = *reg_info;
|
|
const uint32_t cfa_reg_num =
|
|
reg_info->kinds[m_unwind_plan_ptr->GetRegisterKind()];
|
|
assert(cfa_reg_num != LLDB_INVALID_REGNUM);
|
|
m_curr_row->GetCFAValue().SetIsRegisterPlusOffset(
|
|
cfa_reg_num, m_initial_sp - reg_value.GetAsUInt64());
|
|
m_curr_row_modified = true;
|
|
}
|
|
break;
|
|
|
|
case EmulateInstruction::eContextAdjustStackPointer:
|
|
// If we have created a frame using the frame pointer, don't follow
|
|
// subsequent adjustments to the stack pointer.
|
|
if (!m_fp_is_cfa) {
|
|
m_curr_row->GetCFAValue().SetIsRegisterPlusOffset(
|
|
m_curr_row->GetCFAValue().GetRegisterNumber(),
|
|
m_initial_sp - reg_value.GetAsUInt64());
|
|
m_curr_row_modified = true;
|
|
}
|
|
break;
|
|
}
|
|
return true;
|
|
}
|