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-rw-r--r--contrib/llvm-project/lldb/source/Symbol/CompactUnwindInfo.cpp1611
1 files changed, 1611 insertions, 0 deletions
diff --git a/contrib/llvm-project/lldb/source/Symbol/CompactUnwindInfo.cpp b/contrib/llvm-project/lldb/source/Symbol/CompactUnwindInfo.cpp
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index 000000000000..c9039ea51ff7
--- /dev/null
+++ b/contrib/llvm-project/lldb/source/Symbol/CompactUnwindInfo.cpp
@@ -0,0 +1,1611 @@
+//===-- CompactUnwindInfo.cpp ---------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "lldb/Symbol/CompactUnwindInfo.h"
+#include "lldb/Core/Debugger.h"
+#include "lldb/Core/Module.h"
+#include "lldb/Core/Section.h"
+#include "lldb/Symbol/ObjectFile.h"
+#include "lldb/Symbol/UnwindPlan.h"
+#include "lldb/Target/Process.h"
+#include "lldb/Target/Target.h"
+#include "lldb/Utility/ArchSpec.h"
+#include "lldb/Utility/DataBufferHeap.h"
+#include "lldb/Utility/LLDBLog.h"
+#include "lldb/Utility/Log.h"
+#include "lldb/Utility/StreamString.h"
+
+#include "llvm/Support/MathExtras.h"
+
+#include <algorithm>
+#include <memory>
+
+using namespace lldb;
+using namespace lldb_private;
+
+namespace lldb_private {
+
+// Constants from <mach-o/compact_unwind_encoding.h>
+
+FLAGS_ANONYMOUS_ENUM(){
+ UNWIND_IS_NOT_FUNCTION_START = 0x80000000, UNWIND_HAS_LSDA = 0x40000000,
+ UNWIND_PERSONALITY_MASK = 0x30000000,
+};
+
+FLAGS_ANONYMOUS_ENUM(){
+ UNWIND_X86_MODE_MASK = 0x0F000000,
+ UNWIND_X86_MODE_EBP_FRAME = 0x01000000,
+ UNWIND_X86_MODE_STACK_IMMD = 0x02000000,
+ UNWIND_X86_MODE_STACK_IND = 0x03000000,
+ UNWIND_X86_MODE_DWARF = 0x04000000,
+
+ UNWIND_X86_EBP_FRAME_REGISTERS = 0x00007FFF,
+ UNWIND_X86_EBP_FRAME_OFFSET = 0x00FF0000,
+
+ UNWIND_X86_FRAMELESS_STACK_SIZE = 0x00FF0000,
+ UNWIND_X86_FRAMELESS_STACK_ADJUST = 0x0000E000,
+ UNWIND_X86_FRAMELESS_STACK_REG_COUNT = 0x00001C00,
+ UNWIND_X86_FRAMELESS_STACK_REG_PERMUTATION = 0x000003FF,
+
+ UNWIND_X86_DWARF_SECTION_OFFSET = 0x00FFFFFF,
+};
+
+enum {
+ UNWIND_X86_REG_NONE = 0,
+ UNWIND_X86_REG_EBX = 1,
+ UNWIND_X86_REG_ECX = 2,
+ UNWIND_X86_REG_EDX = 3,
+ UNWIND_X86_REG_EDI = 4,
+ UNWIND_X86_REG_ESI = 5,
+ UNWIND_X86_REG_EBP = 6,
+};
+
+FLAGS_ANONYMOUS_ENUM(){
+ UNWIND_X86_64_MODE_MASK = 0x0F000000,
+ UNWIND_X86_64_MODE_RBP_FRAME = 0x01000000,
+ UNWIND_X86_64_MODE_STACK_IMMD = 0x02000000,
+ UNWIND_X86_64_MODE_STACK_IND = 0x03000000,
+ UNWIND_X86_64_MODE_DWARF = 0x04000000,
+
+ UNWIND_X86_64_RBP_FRAME_REGISTERS = 0x00007FFF,
+ UNWIND_X86_64_RBP_FRAME_OFFSET = 0x00FF0000,
+
+ UNWIND_X86_64_FRAMELESS_STACK_SIZE = 0x00FF0000,
+ UNWIND_X86_64_FRAMELESS_STACK_ADJUST = 0x0000E000,
+ UNWIND_X86_64_FRAMELESS_STACK_REG_COUNT = 0x00001C00,
+ UNWIND_X86_64_FRAMELESS_STACK_REG_PERMUTATION = 0x000003FF,
+
+ UNWIND_X86_64_DWARF_SECTION_OFFSET = 0x00FFFFFF,
+};
+
+enum {
+ UNWIND_X86_64_REG_NONE = 0,
+ UNWIND_X86_64_REG_RBX = 1,
+ UNWIND_X86_64_REG_R12 = 2,
+ UNWIND_X86_64_REG_R13 = 3,
+ UNWIND_X86_64_REG_R14 = 4,
+ UNWIND_X86_64_REG_R15 = 5,
+ UNWIND_X86_64_REG_RBP = 6,
+};
+
+FLAGS_ANONYMOUS_ENUM(){
+ UNWIND_ARM64_MODE_MASK = 0x0F000000,
+ UNWIND_ARM64_MODE_FRAMELESS = 0x02000000,
+ UNWIND_ARM64_MODE_DWARF = 0x03000000,
+ UNWIND_ARM64_MODE_FRAME = 0x04000000,
+
+ UNWIND_ARM64_FRAME_X19_X20_PAIR = 0x00000001,
+ UNWIND_ARM64_FRAME_X21_X22_PAIR = 0x00000002,
+ UNWIND_ARM64_FRAME_X23_X24_PAIR = 0x00000004,
+ UNWIND_ARM64_FRAME_X25_X26_PAIR = 0x00000008,
+ UNWIND_ARM64_FRAME_X27_X28_PAIR = 0x00000010,
+ UNWIND_ARM64_FRAME_D8_D9_PAIR = 0x00000100,
+ UNWIND_ARM64_FRAME_D10_D11_PAIR = 0x00000200,
+ UNWIND_ARM64_FRAME_D12_D13_PAIR = 0x00000400,
+ UNWIND_ARM64_FRAME_D14_D15_PAIR = 0x00000800,
+
+ UNWIND_ARM64_FRAMELESS_STACK_SIZE_MASK = 0x00FFF000,
+ UNWIND_ARM64_DWARF_SECTION_OFFSET = 0x00FFFFFF,
+};
+
+FLAGS_ANONYMOUS_ENUM(){
+ UNWIND_ARM_MODE_MASK = 0x0F000000,
+ UNWIND_ARM_MODE_FRAME = 0x01000000,
+ UNWIND_ARM_MODE_FRAME_D = 0x02000000,
+ UNWIND_ARM_MODE_DWARF = 0x04000000,
+
+ UNWIND_ARM_FRAME_STACK_ADJUST_MASK = 0x00C00000,
+
+ UNWIND_ARM_FRAME_FIRST_PUSH_R4 = 0x00000001,
+ UNWIND_ARM_FRAME_FIRST_PUSH_R5 = 0x00000002,
+ UNWIND_ARM_FRAME_FIRST_PUSH_R6 = 0x00000004,
+
+ UNWIND_ARM_FRAME_SECOND_PUSH_R8 = 0x00000008,
+ UNWIND_ARM_FRAME_SECOND_PUSH_R9 = 0x00000010,
+ UNWIND_ARM_FRAME_SECOND_PUSH_R10 = 0x00000020,
+ UNWIND_ARM_FRAME_SECOND_PUSH_R11 = 0x00000040,
+ UNWIND_ARM_FRAME_SECOND_PUSH_R12 = 0x00000080,
+
+ UNWIND_ARM_FRAME_D_REG_COUNT_MASK = 0x00000700,
+
+ UNWIND_ARM_DWARF_SECTION_OFFSET = 0x00FFFFFF,
+};
+}
+
+#ifndef UNWIND_SECOND_LEVEL_REGULAR
+#define UNWIND_SECOND_LEVEL_REGULAR 2
+#endif
+
+#ifndef UNWIND_SECOND_LEVEL_COMPRESSED
+#define UNWIND_SECOND_LEVEL_COMPRESSED 3
+#endif
+
+#ifndef UNWIND_INFO_COMPRESSED_ENTRY_FUNC_OFFSET
+#define UNWIND_INFO_COMPRESSED_ENTRY_FUNC_OFFSET(entry) (entry & 0x00FFFFFF)
+#endif
+
+#ifndef UNWIND_INFO_COMPRESSED_ENTRY_ENCODING_INDEX
+#define UNWIND_INFO_COMPRESSED_ENTRY_ENCODING_INDEX(entry) \
+ ((entry >> 24) & 0xFF)
+#endif
+
+#define EXTRACT_BITS(value, mask) \
+ ((value >> llvm::countr_zero(static_cast<uint32_t>(mask))) & \
+ (((1 << llvm::popcount(static_cast<uint32_t>(mask)))) - 1))
+
+// constructor
+
+CompactUnwindInfo::CompactUnwindInfo(ObjectFile &objfile, SectionSP &section_sp)
+ : m_objfile(objfile), m_section_sp(section_sp),
+ m_section_contents_if_encrypted(), m_mutex(), m_indexes(),
+ m_indexes_computed(eLazyBoolCalculate), m_unwindinfo_data(),
+ m_unwindinfo_data_computed(false), m_unwind_header() {}
+
+// destructor
+
+CompactUnwindInfo::~CompactUnwindInfo() = default;
+
+bool CompactUnwindInfo::GetUnwindPlan(Target &target, Address addr,
+ UnwindPlan &unwind_plan) {
+ if (!IsValid(target.GetProcessSP())) {
+ return false;
+ }
+ FunctionInfo function_info;
+ if (GetCompactUnwindInfoForFunction(target, addr, function_info)) {
+ // shortcut return for functions that have no compact unwind
+ if (function_info.encoding == 0)
+ return false;
+
+ if (ArchSpec arch = m_objfile.GetArchitecture()) {
+
+ Log *log = GetLog(LLDBLog::Unwind);
+ if (log && log->GetVerbose()) {
+ StreamString strm;
+ addr.Dump(
+ &strm, nullptr,
+ Address::DumpStyle::DumpStyleResolvedDescriptionNoFunctionArguments,
+ Address::DumpStyle::DumpStyleFileAddress,
+ arch.GetAddressByteSize());
+ LLDB_LOGF(log, "Got compact unwind encoding 0x%x for function %s",
+ function_info.encoding, strm.GetData());
+ }
+
+ if (function_info.valid_range_offset_start != 0 &&
+ function_info.valid_range_offset_end != 0) {
+ SectionList *sl = m_objfile.GetSectionList();
+ if (sl) {
+ addr_t func_range_start_file_addr =
+ function_info.valid_range_offset_start +
+ m_objfile.GetBaseAddress().GetFileAddress();
+ AddressRange func_range(func_range_start_file_addr,
+ function_info.valid_range_offset_end -
+ function_info.valid_range_offset_start,
+ sl);
+ unwind_plan.SetPlanValidAddressRange(func_range);
+ }
+ }
+
+ if (arch.GetTriple().getArch() == llvm::Triple::x86_64) {
+ return CreateUnwindPlan_x86_64(target, function_info, unwind_plan,
+ addr);
+ }
+ if (arch.GetTriple().getArch() == llvm::Triple::aarch64 ||
+ arch.GetTriple().getArch() == llvm::Triple::aarch64_32) {
+ return CreateUnwindPlan_arm64(target, function_info, unwind_plan, addr);
+ }
+ if (arch.GetTriple().getArch() == llvm::Triple::x86) {
+ return CreateUnwindPlan_i386(target, function_info, unwind_plan, addr);
+ }
+ if (arch.GetTriple().getArch() == llvm::Triple::arm ||
+ arch.GetTriple().getArch() == llvm::Triple::thumb) {
+ return CreateUnwindPlan_armv7(target, function_info, unwind_plan, addr);
+ }
+ }
+ }
+ return false;
+}
+
+bool CompactUnwindInfo::IsValid(const ProcessSP &process_sp) {
+ if (m_section_sp.get() == nullptr)
+ return false;
+
+ if (m_indexes_computed == eLazyBoolYes && m_unwindinfo_data_computed)
+ return true;
+
+ ScanIndex(process_sp);
+
+ return m_indexes_computed == eLazyBoolYes && m_unwindinfo_data_computed;
+}
+
+void CompactUnwindInfo::ScanIndex(const ProcessSP &process_sp) {
+ std::lock_guard<std::mutex> guard(m_mutex);
+ if (m_indexes_computed == eLazyBoolYes && m_unwindinfo_data_computed)
+ return;
+
+ // We can't read the index for some reason.
+ if (m_indexes_computed == eLazyBoolNo) {
+ return;
+ }
+
+ Log *log = GetLog(LLDBLog::Unwind);
+ if (log)
+ m_objfile.GetModule()->LogMessage(
+ log, "Reading compact unwind first-level indexes");
+
+ if (!m_unwindinfo_data_computed) {
+ if (m_section_sp->IsEncrypted()) {
+ // Can't get section contents of a protected/encrypted section until we
+ // have a live process and can read them out of memory.
+ if (process_sp.get() == nullptr)
+ return;
+ m_section_contents_if_encrypted =
+ std::make_shared<DataBufferHeap>(m_section_sp->GetByteSize(), 0);
+ Status error;
+ if (process_sp->ReadMemory(
+ m_section_sp->GetLoadBaseAddress(&process_sp->GetTarget()),
+ m_section_contents_if_encrypted->GetBytes(),
+ m_section_sp->GetByteSize(),
+ error) == m_section_sp->GetByteSize() &&
+ error.Success()) {
+ m_unwindinfo_data.SetAddressByteSize(
+ process_sp->GetTarget().GetArchitecture().GetAddressByteSize());
+ m_unwindinfo_data.SetByteOrder(
+ process_sp->GetTarget().GetArchitecture().GetByteOrder());
+ m_unwindinfo_data.SetData(m_section_contents_if_encrypted, 0);
+ }
+ } else {
+ m_objfile.ReadSectionData(m_section_sp.get(), m_unwindinfo_data);
+ }
+ if (m_unwindinfo_data.GetByteSize() != m_section_sp->GetByteSize())
+ return;
+ m_unwindinfo_data_computed = true;
+ }
+
+ if (m_unwindinfo_data.GetByteSize() > 0) {
+ offset_t offset = 0;
+
+ // struct unwind_info_section_header
+ // {
+ // uint32_t version; // UNWIND_SECTION_VERSION
+ // uint32_t commonEncodingsArraySectionOffset;
+ // uint32_t commonEncodingsArrayCount;
+ // uint32_t personalityArraySectionOffset;
+ // uint32_t personalityArrayCount;
+ // uint32_t indexSectionOffset;
+ // uint32_t indexCount;
+
+ m_unwind_header.version = m_unwindinfo_data.GetU32(&offset);
+ m_unwind_header.common_encodings_array_offset =
+ m_unwindinfo_data.GetU32(&offset);
+ m_unwind_header.common_encodings_array_count =
+ m_unwindinfo_data.GetU32(&offset);
+ m_unwind_header.personality_array_offset =
+ m_unwindinfo_data.GetU32(&offset);
+ m_unwind_header.personality_array_count = m_unwindinfo_data.GetU32(&offset);
+ uint32_t indexSectionOffset = m_unwindinfo_data.GetU32(&offset);
+
+ uint32_t indexCount = m_unwindinfo_data.GetU32(&offset);
+
+ if (m_unwind_header.common_encodings_array_offset >
+ m_unwindinfo_data.GetByteSize() ||
+ m_unwind_header.personality_array_offset >
+ m_unwindinfo_data.GetByteSize() ||
+ indexSectionOffset > m_unwindinfo_data.GetByteSize() ||
+ offset > m_unwindinfo_data.GetByteSize()) {
+ Debugger::ReportError(
+ "Invalid offset encountered in compact unwind info, skipping");
+ // don't trust anything from this compact_unwind section if it looks
+ // blatantly invalid data in the header.
+ m_indexes_computed = eLazyBoolNo;
+ return;
+ }
+
+ // Parse the basic information from the indexes We wait to scan the second
+ // level page info until it's needed
+
+ // struct unwind_info_section_header_index_entry {
+ // uint32_t functionOffset;
+ // uint32_t secondLevelPagesSectionOffset;
+ // uint32_t lsdaIndexArraySectionOffset;
+ // };
+
+ bool clear_address_zeroth_bit = false;
+ if (ArchSpec arch = m_objfile.GetArchitecture()) {
+ if (arch.GetTriple().getArch() == llvm::Triple::arm ||
+ arch.GetTriple().getArch() == llvm::Triple::thumb)
+ clear_address_zeroth_bit = true;
+ }
+
+ offset = indexSectionOffset;
+ for (uint32_t idx = 0; idx < indexCount; idx++) {
+ uint32_t function_offset =
+ m_unwindinfo_data.GetU32(&offset); // functionOffset
+ uint32_t second_level_offset =
+ m_unwindinfo_data.GetU32(&offset); // secondLevelPagesSectionOffset
+ uint32_t lsda_offset =
+ m_unwindinfo_data.GetU32(&offset); // lsdaIndexArraySectionOffset
+
+ if (second_level_offset > m_section_sp->GetByteSize() ||
+ lsda_offset > m_section_sp->GetByteSize()) {
+ m_indexes_computed = eLazyBoolNo;
+ }
+
+ if (clear_address_zeroth_bit)
+ function_offset &= ~1ull;
+
+ UnwindIndex this_index;
+ this_index.function_offset = function_offset;
+ this_index.second_level = second_level_offset;
+ this_index.lsda_array_start = lsda_offset;
+
+ if (m_indexes.size() > 0) {
+ m_indexes[m_indexes.size() - 1].lsda_array_end = lsda_offset;
+ }
+
+ if (second_level_offset == 0) {
+ this_index.sentinal_entry = true;
+ }
+
+ m_indexes.push_back(this_index);
+ }
+ m_indexes_computed = eLazyBoolYes;
+ } else {
+ m_indexes_computed = eLazyBoolNo;
+ }
+}
+
+uint32_t CompactUnwindInfo::GetLSDAForFunctionOffset(uint32_t lsda_offset,
+ uint32_t lsda_count,
+ uint32_t function_offset) {
+ // struct unwind_info_section_header_lsda_index_entry {
+ // uint32_t functionOffset;
+ // uint32_t lsdaOffset;
+ // };
+
+ offset_t first_entry = lsda_offset;
+ uint32_t low = 0;
+ uint32_t high = lsda_count;
+ while (low < high) {
+ uint32_t mid = (low + high) / 2;
+ offset_t offset = first_entry + (mid * 8);
+ uint32_t mid_func_offset =
+ m_unwindinfo_data.GetU32(&offset); // functionOffset
+ uint32_t mid_lsda_offset = m_unwindinfo_data.GetU32(&offset); // lsdaOffset
+ if (mid_func_offset == function_offset) {
+ return mid_lsda_offset;
+ }
+ if (mid_func_offset < function_offset) {
+ low = mid + 1;
+ } else {
+ high = mid;
+ }
+ }
+ return 0;
+}
+
+lldb::offset_t CompactUnwindInfo::BinarySearchRegularSecondPage(
+ uint32_t entry_page_offset, uint32_t entry_count, uint32_t function_offset,
+ uint32_t *entry_func_start_offset, uint32_t *entry_func_end_offset) {
+ // typedef uint32_t compact_unwind_encoding_t;
+ // struct unwind_info_regular_second_level_entry {
+ // uint32_t functionOffset;
+ // compact_unwind_encoding_t encoding;
+
+ offset_t first_entry = entry_page_offset;
+
+ uint32_t low = 0;
+ uint32_t high = entry_count;
+ uint32_t last = high - 1;
+ while (low < high) {
+ uint32_t mid = (low + high) / 2;
+ offset_t offset = first_entry + (mid * 8);
+ uint32_t mid_func_offset =
+ m_unwindinfo_data.GetU32(&offset); // functionOffset
+ uint32_t next_func_offset = 0;
+ if (mid < last) {
+ offset = first_entry + ((mid + 1) * 8);
+ next_func_offset = m_unwindinfo_data.GetU32(&offset); // functionOffset
+ }
+ if (mid_func_offset <= function_offset) {
+ if (mid == last || (next_func_offset > function_offset)) {
+ if (entry_func_start_offset)
+ *entry_func_start_offset = mid_func_offset;
+ if (mid != last && entry_func_end_offset)
+ *entry_func_end_offset = next_func_offset;
+ return first_entry + (mid * 8);
+ } else {
+ low = mid + 1;
+ }
+ } else {
+ high = mid;
+ }
+ }
+ return LLDB_INVALID_OFFSET;
+}
+
+uint32_t CompactUnwindInfo::BinarySearchCompressedSecondPage(
+ uint32_t entry_page_offset, uint32_t entry_count,
+ uint32_t function_offset_to_find, uint32_t function_offset_base,
+ uint32_t *entry_func_start_offset, uint32_t *entry_func_end_offset) {
+ offset_t first_entry = entry_page_offset;
+
+ uint32_t low = 0;
+ uint32_t high = entry_count;
+ uint32_t last = high - 1;
+ while (low < high) {
+ uint32_t mid = (low + high) / 2;
+ offset_t offset = first_entry + (mid * 4);
+ uint32_t entry = m_unwindinfo_data.GetU32(&offset); // entry
+ uint32_t mid_func_offset = UNWIND_INFO_COMPRESSED_ENTRY_FUNC_OFFSET(entry);
+ mid_func_offset += function_offset_base;
+ uint32_t next_func_offset = 0;
+ if (mid < last) {
+ offset = first_entry + ((mid + 1) * 4);
+ uint32_t next_entry = m_unwindinfo_data.GetU32(&offset); // entry
+ next_func_offset = UNWIND_INFO_COMPRESSED_ENTRY_FUNC_OFFSET(next_entry);
+ next_func_offset += function_offset_base;
+ }
+ if (mid_func_offset <= function_offset_to_find) {
+ if (mid == last || (next_func_offset > function_offset_to_find)) {
+ if (entry_func_start_offset)
+ *entry_func_start_offset = mid_func_offset;
+ if (mid != last && entry_func_end_offset)
+ *entry_func_end_offset = next_func_offset;
+ return UNWIND_INFO_COMPRESSED_ENTRY_ENCODING_INDEX(entry);
+ } else {
+ low = mid + 1;
+ }
+ } else {
+ high = mid;
+ }
+ }
+
+ return UINT32_MAX;
+}
+
+bool CompactUnwindInfo::GetCompactUnwindInfoForFunction(
+ Target &target, Address address, FunctionInfo &unwind_info) {
+ unwind_info.encoding = 0;
+ unwind_info.lsda_address.Clear();
+ unwind_info.personality_ptr_address.Clear();
+
+ if (!IsValid(target.GetProcessSP()))
+ return false;
+
+ addr_t text_section_file_address = LLDB_INVALID_ADDRESS;
+ SectionList *sl = m_objfile.GetSectionList();
+ if (sl) {
+ SectionSP text_sect = sl->FindSectionByType(eSectionTypeCode, true);
+ if (text_sect.get()) {
+ text_section_file_address = text_sect->GetFileAddress();
+ }
+ }
+ if (text_section_file_address == LLDB_INVALID_ADDRESS)
+ return false;
+
+ addr_t function_offset =
+ address.GetFileAddress() - m_objfile.GetBaseAddress().GetFileAddress();
+
+ UnwindIndex key;
+ key.function_offset = function_offset;
+
+ std::vector<UnwindIndex>::const_iterator it;
+ it = llvm::lower_bound(m_indexes, key);
+ if (it == m_indexes.end()) {
+ return false;
+ }
+
+ if (it->function_offset != key.function_offset) {
+ if (it != m_indexes.begin())
+ --it;
+ }
+
+ if (it->sentinal_entry) {
+ return false;
+ }
+
+ auto next_it = it + 1;
+ if (next_it != m_indexes.end()) {
+ // initialize the function offset end range to be the start of the next
+ // index offset. If we find an entry which is at the end of the index
+ // table, this will establish the range end.
+ unwind_info.valid_range_offset_end = next_it->function_offset;
+ }
+
+ offset_t second_page_offset = it->second_level;
+ offset_t lsda_array_start = it->lsda_array_start;
+ offset_t lsda_array_count = (it->lsda_array_end - it->lsda_array_start) / 8;
+
+ offset_t offset = second_page_offset;
+ uint32_t kind = m_unwindinfo_data.GetU32(
+ &offset); // UNWIND_SECOND_LEVEL_REGULAR or UNWIND_SECOND_LEVEL_COMPRESSED
+
+ if (kind == UNWIND_SECOND_LEVEL_REGULAR) {
+ // struct unwind_info_regular_second_level_page_header {
+ // uint32_t kind; // UNWIND_SECOND_LEVEL_REGULAR
+ // uint16_t entryPageOffset;
+ // uint16_t entryCount;
+
+ // typedef uint32_t compact_unwind_encoding_t;
+ // struct unwind_info_regular_second_level_entry {
+ // uint32_t functionOffset;
+ // compact_unwind_encoding_t encoding;
+
+ uint16_t entry_page_offset =
+ m_unwindinfo_data.GetU16(&offset); // entryPageOffset
+ uint16_t entry_count = m_unwindinfo_data.GetU16(&offset); // entryCount
+
+ offset_t entry_offset = BinarySearchRegularSecondPage(
+ second_page_offset + entry_page_offset, entry_count, function_offset,
+ &unwind_info.valid_range_offset_start,
+ &unwind_info.valid_range_offset_end);
+ if (entry_offset == LLDB_INVALID_OFFSET) {
+ return false;
+ }
+ entry_offset += 4; // skip over functionOffset
+ unwind_info.encoding = m_unwindinfo_data.GetU32(&entry_offset); // encoding
+ if (unwind_info.encoding & UNWIND_HAS_LSDA) {
+ SectionList *sl = m_objfile.GetSectionList();
+ if (sl) {
+ uint32_t lsda_offset = GetLSDAForFunctionOffset(
+ lsda_array_start, lsda_array_count, function_offset);
+ addr_t objfile_base_address =
+ m_objfile.GetBaseAddress().GetFileAddress();
+ unwind_info.lsda_address.ResolveAddressUsingFileSections(
+ objfile_base_address + lsda_offset, sl);
+ }
+ }
+ if (unwind_info.encoding & UNWIND_PERSONALITY_MASK) {
+ uint32_t personality_index =
+ EXTRACT_BITS(unwind_info.encoding, UNWIND_PERSONALITY_MASK);
+
+ if (personality_index > 0) {
+ personality_index--;
+ if (personality_index < m_unwind_header.personality_array_count) {
+ offset_t offset = m_unwind_header.personality_array_offset;
+ offset += 4 * personality_index;
+ SectionList *sl = m_objfile.GetSectionList();
+ if (sl) {
+ uint32_t personality_offset = m_unwindinfo_data.GetU32(&offset);
+ addr_t objfile_base_address =
+ m_objfile.GetBaseAddress().GetFileAddress();
+ unwind_info.personality_ptr_address.ResolveAddressUsingFileSections(
+ objfile_base_address + personality_offset, sl);
+ }
+ }
+ }
+ }
+ return true;
+ } else if (kind == UNWIND_SECOND_LEVEL_COMPRESSED) {
+ // struct unwind_info_compressed_second_level_page_header {
+ // uint32_t kind; // UNWIND_SECOND_LEVEL_COMPRESSED
+ // uint16_t entryPageOffset; // offset from this 2nd lvl page
+ // idx to array of entries
+ // // (an entry has a function
+ // offset and index into the
+ // encodings)
+ // // NB function offset from the
+ // entry in the compressed page
+ // // must be added to the index's
+ // functionOffset value.
+ // uint16_t entryCount;
+ // uint16_t encodingsPageOffset; // offset from this 2nd lvl page
+ // idx to array of encodings
+ // uint16_t encodingsCount;
+
+ uint16_t entry_page_offset =
+ m_unwindinfo_data.GetU16(&offset); // entryPageOffset
+ uint16_t entry_count = m_unwindinfo_data.GetU16(&offset); // entryCount
+ uint16_t encodings_page_offset =
+ m_unwindinfo_data.GetU16(&offset); // encodingsPageOffset
+ uint16_t encodings_count =
+ m_unwindinfo_data.GetU16(&offset); // encodingsCount
+
+ uint32_t encoding_index = BinarySearchCompressedSecondPage(
+ second_page_offset + entry_page_offset, entry_count, function_offset,
+ it->function_offset, &unwind_info.valid_range_offset_start,
+ &unwind_info.valid_range_offset_end);
+ if (encoding_index == UINT32_MAX ||
+ encoding_index >=
+ encodings_count + m_unwind_header.common_encodings_array_count) {
+ return false;
+ }
+ uint32_t encoding = 0;
+ if (encoding_index < m_unwind_header.common_encodings_array_count) {
+ offset = m_unwind_header.common_encodings_array_offset +
+ (encoding_index * sizeof(uint32_t));
+ encoding = m_unwindinfo_data.GetU32(
+ &offset); // encoding entry from the commonEncodingsArray
+ } else {
+ uint32_t page_specific_entry_index =
+ encoding_index - m_unwind_header.common_encodings_array_count;
+ offset = second_page_offset + encodings_page_offset +
+ (page_specific_entry_index * sizeof(uint32_t));
+ encoding = m_unwindinfo_data.GetU32(
+ &offset); // encoding entry from the page-specific encoding array
+ }
+ if (encoding == 0)
+ return false;
+
+ unwind_info.encoding = encoding;
+ if (unwind_info.encoding & UNWIND_HAS_LSDA) {
+ SectionList *sl = m_objfile.GetSectionList();
+ if (sl) {
+ uint32_t lsda_offset = GetLSDAForFunctionOffset(
+ lsda_array_start, lsda_array_count, function_offset);
+ addr_t objfile_base_address =
+ m_objfile.GetBaseAddress().GetFileAddress();
+ unwind_info.lsda_address.ResolveAddressUsingFileSections(
+ objfile_base_address + lsda_offset, sl);
+ }
+ }
+ if (unwind_info.encoding & UNWIND_PERSONALITY_MASK) {
+ uint32_t personality_index =
+ EXTRACT_BITS(unwind_info.encoding, UNWIND_PERSONALITY_MASK);
+
+ if (personality_index > 0) {
+ personality_index--;
+ if (personality_index < m_unwind_header.personality_array_count) {
+ offset_t offset = m_unwind_header.personality_array_offset;
+ offset += 4 * personality_index;
+ SectionList *sl = m_objfile.GetSectionList();
+ if (sl) {
+ uint32_t personality_offset = m_unwindinfo_data.GetU32(&offset);
+ addr_t objfile_base_address =
+ m_objfile.GetBaseAddress().GetFileAddress();
+ unwind_info.personality_ptr_address.ResolveAddressUsingFileSections(
+ objfile_base_address + personality_offset, sl);
+ }
+ }
+ }
+ }
+ return true;
+ }
+ return false;
+}
+
+enum x86_64_eh_regnum {
+ rax = 0,
+ rdx = 1,
+ rcx = 2,
+ rbx = 3,
+ rsi = 4,
+ rdi = 5,
+ rbp = 6,
+ rsp = 7,
+ r8 = 8,
+ r9 = 9,
+ r10 = 10,
+ r11 = 11,
+ r12 = 12,
+ r13 = 13,
+ r14 = 14,
+ r15 = 15,
+ rip = 16 // this is officially the Return Address register number, but close
+ // enough
+};
+
+// Convert the compact_unwind_info.h register numbering scheme to
+// eRegisterKindEHFrame (eh_frame) register numbering scheme.
+uint32_t translate_to_eh_frame_regnum_x86_64(uint32_t unwind_regno) {
+ switch (unwind_regno) {
+ case UNWIND_X86_64_REG_RBX:
+ return x86_64_eh_regnum::rbx;
+ case UNWIND_X86_64_REG_R12:
+ return x86_64_eh_regnum::r12;
+ case UNWIND_X86_64_REG_R13:
+ return x86_64_eh_regnum::r13;
+ case UNWIND_X86_64_REG_R14:
+ return x86_64_eh_regnum::r14;
+ case UNWIND_X86_64_REG_R15:
+ return x86_64_eh_regnum::r15;
+ case UNWIND_X86_64_REG_RBP:
+ return x86_64_eh_regnum::rbp;
+ default:
+ return LLDB_INVALID_REGNUM;
+ }
+}
+
+bool CompactUnwindInfo::CreateUnwindPlan_x86_64(Target &target,
+ FunctionInfo &function_info,
+ UnwindPlan &unwind_plan,
+ Address pc_or_function_start) {
+ unwind_plan.SetSourceName("compact unwind info");
+ unwind_plan.SetSourcedFromCompiler(eLazyBoolYes);
+ unwind_plan.SetUnwindPlanValidAtAllInstructions(eLazyBoolNo);
+ unwind_plan.SetUnwindPlanForSignalTrap(eLazyBoolNo);
+ unwind_plan.SetRegisterKind(eRegisterKindEHFrame);
+
+ unwind_plan.SetLSDAAddress(function_info.lsda_address);
+ unwind_plan.SetPersonalityFunctionPtr(function_info.personality_ptr_address);
+
+ UnwindPlan::RowSP row(new UnwindPlan::Row);
+
+ const int wordsize = 8;
+ int mode = function_info.encoding & UNWIND_X86_64_MODE_MASK;
+ switch (mode) {
+ case UNWIND_X86_64_MODE_RBP_FRAME: {
+ row->GetCFAValue().SetIsRegisterPlusOffset(
+ translate_to_eh_frame_regnum_x86_64(UNWIND_X86_64_REG_RBP),
+ 2 * wordsize);
+ row->SetOffset(0);
+ row->SetRegisterLocationToAtCFAPlusOffset(x86_64_eh_regnum::rbp,
+ wordsize * -2, true);
+ row->SetRegisterLocationToAtCFAPlusOffset(x86_64_eh_regnum::rip,
+ wordsize * -1, true);
+ row->SetRegisterLocationToIsCFAPlusOffset(x86_64_eh_regnum::rsp, 0, true);
+
+ uint32_t saved_registers_offset =
+ EXTRACT_BITS(function_info.encoding, UNWIND_X86_64_RBP_FRAME_OFFSET);
+
+ uint32_t saved_registers_locations =
+ EXTRACT_BITS(function_info.encoding, UNWIND_X86_64_RBP_FRAME_REGISTERS);
+
+ saved_registers_offset += 2;
+
+ for (int i = 0; i < 5; i++) {
+ uint32_t regnum = saved_registers_locations & 0x7;
+ switch (regnum) {
+ case UNWIND_X86_64_REG_NONE:
+ break;
+ case UNWIND_X86_64_REG_RBX:
+ case UNWIND_X86_64_REG_R12:
+ case UNWIND_X86_64_REG_R13:
+ case UNWIND_X86_64_REG_R14:
+ case UNWIND_X86_64_REG_R15:
+ row->SetRegisterLocationToAtCFAPlusOffset(
+ translate_to_eh_frame_regnum_x86_64(regnum),
+ wordsize * -saved_registers_offset, true);
+ break;
+ }
+ saved_registers_offset--;
+ saved_registers_locations >>= 3;
+ }
+ unwind_plan.AppendRow(row);
+ return true;
+ } break;
+
+ case UNWIND_X86_64_MODE_STACK_IND: {
+ // The clang in Xcode 6 is emitting incorrect compact unwind encodings for
+ // this style of unwind. It was fixed in llvm r217020. The clang in Xcode
+ // 7 has this fixed.
+ return false;
+ } break;
+
+ case UNWIND_X86_64_MODE_STACK_IMMD: {
+ uint32_t stack_size = EXTRACT_BITS(function_info.encoding,
+ UNWIND_X86_64_FRAMELESS_STACK_SIZE);
+ uint32_t register_count = EXTRACT_BITS(
+ function_info.encoding, UNWIND_X86_64_FRAMELESS_STACK_REG_COUNT);
+ uint32_t permutation = EXTRACT_BITS(
+ function_info.encoding, UNWIND_X86_64_FRAMELESS_STACK_REG_PERMUTATION);
+
+ if (mode == UNWIND_X86_64_MODE_STACK_IND &&
+ function_info.valid_range_offset_start != 0) {
+ uint32_t stack_adjust = EXTRACT_BITS(
+ function_info.encoding, UNWIND_X86_64_FRAMELESS_STACK_ADJUST);
+
+ // offset into the function instructions; 0 == beginning of first
+ // instruction
+ uint32_t offset_to_subl_insn = EXTRACT_BITS(
+ function_info.encoding, UNWIND_X86_64_FRAMELESS_STACK_SIZE);
+
+ SectionList *sl = m_objfile.GetSectionList();
+ if (sl) {
+ ProcessSP process_sp = target.GetProcessSP();
+ if (process_sp) {
+ Address subl_payload_addr(function_info.valid_range_offset_start, sl);
+ subl_payload_addr.Slide(offset_to_subl_insn);
+ Status error;
+ uint64_t large_stack_size = process_sp->ReadUnsignedIntegerFromMemory(
+ subl_payload_addr.GetLoadAddress(&target), 4, 0, error);
+ if (large_stack_size != 0 && error.Success()) {
+ // Got the large stack frame size correctly - use it
+ stack_size = large_stack_size + (stack_adjust * wordsize);
+ } else {
+ return false;
+ }
+ } else {
+ return false;
+ }
+ } else {
+ return false;
+ }
+ }
+
+ int32_t offset = mode == UNWIND_X86_64_MODE_STACK_IND
+ ? stack_size
+ : stack_size * wordsize;
+ row->GetCFAValue().SetIsRegisterPlusOffset(x86_64_eh_regnum::rsp, offset);
+
+ row->SetOffset(0);
+ row->SetRegisterLocationToAtCFAPlusOffset(x86_64_eh_regnum::rip,
+ wordsize * -1, true);
+ row->SetRegisterLocationToIsCFAPlusOffset(x86_64_eh_regnum::rsp, 0, true);
+
+ if (register_count > 0) {
+
+ // We need to include (up to) 6 registers in 10 bits. That would be 18
+ // bits if we just used 3 bits per reg to indicate the order they're
+ // saved on the stack.
+ //
+ // This is done with Lehmer code permutation, e.g. see
+ // http://stackoverflow.com/questions/1506078/fast-permutation-number-
+ // permutation-mapping-algorithms
+ int permunreg[6] = {0, 0, 0, 0, 0, 0};
+
+ // This decodes the variable-base number in the 10 bits and gives us the
+ // Lehmer code sequence which can then be decoded.
+
+ switch (register_count) {
+ case 6:
+ permunreg[0] = permutation / 120; // 120 == 5!
+ permutation -= (permunreg[0] * 120);
+ permunreg[1] = permutation / 24; // 24 == 4!
+ permutation -= (permunreg[1] * 24);
+ permunreg[2] = permutation / 6; // 6 == 3!
+ permutation -= (permunreg[2] * 6);
+ permunreg[3] = permutation / 2; // 2 == 2!
+ permutation -= (permunreg[3] * 2);
+ permunreg[4] = permutation; // 1 == 1!
+ permunreg[5] = 0;
+ break;
+ case 5:
+ permunreg[0] = permutation / 120;
+ permutation -= (permunreg[0] * 120);
+ permunreg[1] = permutation / 24;
+ permutation -= (permunreg[1] * 24);
+ permunreg[2] = permutation / 6;
+ permutation -= (permunreg[2] * 6);
+ permunreg[3] = permutation / 2;
+ permutation -= (permunreg[3] * 2);
+ permunreg[4] = permutation;
+ break;
+ case 4:
+ permunreg[0] = permutation / 60;
+ permutation -= (permunreg[0] * 60);
+ permunreg[1] = permutation / 12;
+ permutation -= (permunreg[1] * 12);
+ permunreg[2] = permutation / 3;
+ permutation -= (permunreg[2] * 3);
+ permunreg[3] = permutation;
+ break;
+ case 3:
+ permunreg[0] = permutation / 20;
+ permutation -= (permunreg[0] * 20);
+ permunreg[1] = permutation / 4;
+ permutation -= (permunreg[1] * 4);
+ permunreg[2] = permutation;
+ break;
+ case 2:
+ permunreg[0] = permutation / 5;
+ permutation -= (permunreg[0] * 5);
+ permunreg[1] = permutation;
+ break;
+ case 1:
+ permunreg[0] = permutation;
+ break;
+ }
+
+ // Decode the Lehmer code for this permutation of the registers v.
+ // http://en.wikipedia.org/wiki/Lehmer_code
+
+ int registers[6] = {UNWIND_X86_64_REG_NONE, UNWIND_X86_64_REG_NONE,
+ UNWIND_X86_64_REG_NONE, UNWIND_X86_64_REG_NONE,
+ UNWIND_X86_64_REG_NONE, UNWIND_X86_64_REG_NONE};
+ bool used[7] = {false, false, false, false, false, false, false};
+ for (uint32_t i = 0; i < register_count; i++) {
+ int renum = 0;
+ for (int j = 1; j < 7; j++) {
+ if (!used[j]) {
+ if (renum == permunreg[i]) {
+ registers[i] = j;
+ used[j] = true;
+ break;
+ }
+ renum++;
+ }
+ }
+ }
+
+ uint32_t saved_registers_offset = 1;
+ saved_registers_offset++;
+
+ for (int i = (sizeof(registers) / sizeof(int)) - 1; i >= 0; i--) {
+ switch (registers[i]) {
+ case UNWIND_X86_64_REG_NONE:
+ break;
+ case UNWIND_X86_64_REG_RBX:
+ case UNWIND_X86_64_REG_R12:
+ case UNWIND_X86_64_REG_R13:
+ case UNWIND_X86_64_REG_R14:
+ case UNWIND_X86_64_REG_R15:
+ case UNWIND_X86_64_REG_RBP:
+ row->SetRegisterLocationToAtCFAPlusOffset(
+ translate_to_eh_frame_regnum_x86_64(registers[i]),
+ wordsize * -saved_registers_offset, true);
+ saved_registers_offset++;
+ break;
+ }
+ }
+ }
+ unwind_plan.AppendRow(row);
+ return true;
+ } break;
+
+ case UNWIND_X86_64_MODE_DWARF: {
+ return false;
+ } break;
+
+ case 0: {
+ return false;
+ } break;
+ }
+ return false;
+}
+
+enum i386_eh_regnum {
+ eax = 0,
+ ecx = 1,
+ edx = 2,
+ ebx = 3,
+ ebp = 4,
+ esp = 5,
+ esi = 6,
+ edi = 7,
+ eip = 8 // this is officially the Return Address register number, but close
+ // enough
+};
+
+// Convert the compact_unwind_info.h register numbering scheme to
+// eRegisterKindEHFrame (eh_frame) register numbering scheme.
+uint32_t translate_to_eh_frame_regnum_i386(uint32_t unwind_regno) {
+ switch (unwind_regno) {
+ case UNWIND_X86_REG_EBX:
+ return i386_eh_regnum::ebx;
+ case UNWIND_X86_REG_ECX:
+ return i386_eh_regnum::ecx;
+ case UNWIND_X86_REG_EDX:
+ return i386_eh_regnum::edx;
+ case UNWIND_X86_REG_EDI:
+ return i386_eh_regnum::edi;
+ case UNWIND_X86_REG_ESI:
+ return i386_eh_regnum::esi;
+ case UNWIND_X86_REG_EBP:
+ return i386_eh_regnum::ebp;
+ default:
+ return LLDB_INVALID_REGNUM;
+ }
+}
+
+bool CompactUnwindInfo::CreateUnwindPlan_i386(Target &target,
+ FunctionInfo &function_info,
+ UnwindPlan &unwind_plan,
+ Address pc_or_function_start) {
+ unwind_plan.SetSourceName("compact unwind info");
+ unwind_plan.SetSourcedFromCompiler(eLazyBoolYes);
+ unwind_plan.SetUnwindPlanValidAtAllInstructions(eLazyBoolNo);
+ unwind_plan.SetUnwindPlanForSignalTrap(eLazyBoolNo);
+ unwind_plan.SetRegisterKind(eRegisterKindEHFrame);
+
+ unwind_plan.SetLSDAAddress(function_info.lsda_address);
+ unwind_plan.SetPersonalityFunctionPtr(function_info.personality_ptr_address);
+
+ UnwindPlan::RowSP row(new UnwindPlan::Row);
+
+ const int wordsize = 4;
+ int mode = function_info.encoding & UNWIND_X86_MODE_MASK;
+ switch (mode) {
+ case UNWIND_X86_MODE_EBP_FRAME: {
+ row->GetCFAValue().SetIsRegisterPlusOffset(
+ translate_to_eh_frame_regnum_i386(UNWIND_X86_REG_EBP), 2 * wordsize);
+ row->SetOffset(0);
+ row->SetRegisterLocationToAtCFAPlusOffset(i386_eh_regnum::ebp,
+ wordsize * -2, true);
+ row->SetRegisterLocationToAtCFAPlusOffset(i386_eh_regnum::eip,
+ wordsize * -1, true);
+ row->SetRegisterLocationToIsCFAPlusOffset(i386_eh_regnum::esp, 0, true);
+
+ uint32_t saved_registers_offset =
+ EXTRACT_BITS(function_info.encoding, UNWIND_X86_EBP_FRAME_OFFSET);
+
+ uint32_t saved_registers_locations =
+ EXTRACT_BITS(function_info.encoding, UNWIND_X86_EBP_FRAME_REGISTERS);
+
+ saved_registers_offset += 2;
+
+ for (int i = 0; i < 5; i++) {
+ uint32_t regnum = saved_registers_locations & 0x7;
+ switch (regnum) {
+ case UNWIND_X86_REG_NONE:
+ break;
+ case UNWIND_X86_REG_EBX:
+ case UNWIND_X86_REG_ECX:
+ case UNWIND_X86_REG_EDX:
+ case UNWIND_X86_REG_EDI:
+ case UNWIND_X86_REG_ESI:
+ row->SetRegisterLocationToAtCFAPlusOffset(
+ translate_to_eh_frame_regnum_i386(regnum),
+ wordsize * -saved_registers_offset, true);
+ break;
+ }
+ saved_registers_offset--;
+ saved_registers_locations >>= 3;
+ }
+ unwind_plan.AppendRow(row);
+ return true;
+ } break;
+
+ case UNWIND_X86_MODE_STACK_IND:
+ case UNWIND_X86_MODE_STACK_IMMD: {
+ uint32_t stack_size =
+ EXTRACT_BITS(function_info.encoding, UNWIND_X86_FRAMELESS_STACK_SIZE);
+ uint32_t register_count = EXTRACT_BITS(
+ function_info.encoding, UNWIND_X86_FRAMELESS_STACK_REG_COUNT);
+ uint32_t permutation = EXTRACT_BITS(
+ function_info.encoding, UNWIND_X86_FRAMELESS_STACK_REG_PERMUTATION);
+
+ if (mode == UNWIND_X86_MODE_STACK_IND &&
+ function_info.valid_range_offset_start != 0) {
+ uint32_t stack_adjust = EXTRACT_BITS(function_info.encoding,
+ UNWIND_X86_FRAMELESS_STACK_ADJUST);
+
+ // offset into the function instructions; 0 == beginning of first
+ // instruction
+ uint32_t offset_to_subl_insn =
+ EXTRACT_BITS(function_info.encoding, UNWIND_X86_FRAMELESS_STACK_SIZE);
+
+ SectionList *sl = m_objfile.GetSectionList();
+ if (sl) {
+ ProcessSP process_sp = target.GetProcessSP();
+ if (process_sp) {
+ Address subl_payload_addr(function_info.valid_range_offset_start, sl);
+ subl_payload_addr.Slide(offset_to_subl_insn);
+ Status error;
+ uint64_t large_stack_size = process_sp->ReadUnsignedIntegerFromMemory(
+ subl_payload_addr.GetLoadAddress(&target), 4, 0, error);
+ if (large_stack_size != 0 && error.Success()) {
+ // Got the large stack frame size correctly - use it
+ stack_size = large_stack_size + (stack_adjust * wordsize);
+ } else {
+ return false;
+ }
+ } else {
+ return false;
+ }
+ } else {
+ return false;
+ }
+ }
+
+ int32_t offset =
+ mode == UNWIND_X86_MODE_STACK_IND ? stack_size : stack_size * wordsize;
+ row->GetCFAValue().SetIsRegisterPlusOffset(i386_eh_regnum::esp, offset);
+ row->SetOffset(0);
+ row->SetRegisterLocationToAtCFAPlusOffset(i386_eh_regnum::eip,
+ wordsize * -1, true);
+ row->SetRegisterLocationToIsCFAPlusOffset(i386_eh_regnum::esp, 0, true);
+
+ if (register_count > 0) {
+
+ // We need to include (up to) 6 registers in 10 bits. That would be 18
+ // bits if we just used 3 bits per reg to indicate the order they're
+ // saved on the stack.
+ //
+ // This is done with Lehmer code permutation, e.g. see
+ // http://stackoverflow.com/questions/1506078/fast-permutation-number-
+ // permutation-mapping-algorithms
+ int permunreg[6] = {0, 0, 0, 0, 0, 0};
+
+ // This decodes the variable-base number in the 10 bits and gives us the
+ // Lehmer code sequence which can then be decoded.
+
+ switch (register_count) {
+ case 6:
+ permunreg[0] = permutation / 120; // 120 == 5!
+ permutation -= (permunreg[0] * 120);
+ permunreg[1] = permutation / 24; // 24 == 4!
+ permutation -= (permunreg[1] * 24);
+ permunreg[2] = permutation / 6; // 6 == 3!
+ permutation -= (permunreg[2] * 6);
+ permunreg[3] = permutation / 2; // 2 == 2!
+ permutation -= (permunreg[3] * 2);
+ permunreg[4] = permutation; // 1 == 1!
+ permunreg[5] = 0;
+ break;
+ case 5:
+ permunreg[0] = permutation / 120;
+ permutation -= (permunreg[0] * 120);
+ permunreg[1] = permutation / 24;
+ permutation -= (permunreg[1] * 24);
+ permunreg[2] = permutation / 6;
+ permutation -= (permunreg[2] * 6);
+ permunreg[3] = permutation / 2;
+ permutation -= (permunreg[3] * 2);
+ permunreg[4] = permutation;
+ break;
+ case 4:
+ permunreg[0] = permutation / 60;
+ permutation -= (permunreg[0] * 60);
+ permunreg[1] = permutation / 12;
+ permutation -= (permunreg[1] * 12);
+ permunreg[2] = permutation / 3;
+ permutation -= (permunreg[2] * 3);
+ permunreg[3] = permutation;
+ break;
+ case 3:
+ permunreg[0] = permutation / 20;
+ permutation -= (permunreg[0] * 20);
+ permunreg[1] = permutation / 4;
+ permutation -= (permunreg[1] * 4);
+ permunreg[2] = permutation;
+ break;
+ case 2:
+ permunreg[0] = permutation / 5;
+ permutation -= (permunreg[0] * 5);
+ permunreg[1] = permutation;
+ break;
+ case 1:
+ permunreg[0] = permutation;
+ break;
+ }
+
+ // Decode the Lehmer code for this permutation of the registers v.
+ // http://en.wikipedia.org/wiki/Lehmer_code
+
+ int registers[6] = {UNWIND_X86_REG_NONE, UNWIND_X86_REG_NONE,
+ UNWIND_X86_REG_NONE, UNWIND_X86_REG_NONE,
+ UNWIND_X86_REG_NONE, UNWIND_X86_REG_NONE};
+ bool used[7] = {false, false, false, false, false, false, false};
+ for (uint32_t i = 0; i < register_count; i++) {
+ int renum = 0;
+ for (int j = 1; j < 7; j++) {
+ if (!used[j]) {
+ if (renum == permunreg[i]) {
+ registers[i] = j;
+ used[j] = true;
+ break;
+ }
+ renum++;
+ }
+ }
+ }
+
+ uint32_t saved_registers_offset = 1;
+ saved_registers_offset++;
+
+ for (int i = (sizeof(registers) / sizeof(int)) - 1; i >= 0; i--) {
+ switch (registers[i]) {
+ case UNWIND_X86_REG_NONE:
+ break;
+ case UNWIND_X86_REG_EBX:
+ case UNWIND_X86_REG_ECX:
+ case UNWIND_X86_REG_EDX:
+ case UNWIND_X86_REG_EDI:
+ case UNWIND_X86_REG_ESI:
+ case UNWIND_X86_REG_EBP:
+ row->SetRegisterLocationToAtCFAPlusOffset(
+ translate_to_eh_frame_regnum_i386(registers[i]),
+ wordsize * -saved_registers_offset, true);
+ saved_registers_offset++;
+ break;
+ }
+ }
+ }
+
+ unwind_plan.AppendRow(row);
+ return true;
+ } break;
+
+ case UNWIND_X86_MODE_DWARF: {
+ return false;
+ } break;
+ }
+ return false;
+}
+
+// DWARF register numbers from "DWARF for the ARM 64-bit Architecture (AArch64)"
+// doc by ARM
+
+enum arm64_eh_regnum {
+ x19 = 19,
+ x20 = 20,
+ x21 = 21,
+ x22 = 22,
+ x23 = 23,
+ x24 = 24,
+ x25 = 25,
+ x26 = 26,
+ x27 = 27,
+ x28 = 28,
+
+ fp = 29,
+ ra = 30,
+ sp = 31,
+ pc = 32,
+
+ // Compact unwind encodes d8-d15 but we don't have eh_frame / dwarf reg #'s
+ // for the 64-bit fp regs. Normally in DWARF it's context sensitive - so it
+ // knows it is fetching a 32- or 64-bit quantity from reg v8 to indicate s0
+ // or d0 - but the unwinder is operating at a lower level and we'd try to
+ // fetch 128 bits if we were told that v8 were stored on the stack...
+ v8 = 72,
+ v9 = 73,
+ v10 = 74,
+ v11 = 75,
+ v12 = 76,
+ v13 = 77,
+ v14 = 78,
+ v15 = 79,
+};
+
+enum arm_eh_regnum {
+ arm_r0 = 0,
+ arm_r1 = 1,
+ arm_r2 = 2,
+ arm_r3 = 3,
+ arm_r4 = 4,
+ arm_r5 = 5,
+ arm_r6 = 6,
+ arm_r7 = 7,
+ arm_r8 = 8,
+ arm_r9 = 9,
+ arm_r10 = 10,
+ arm_r11 = 11,
+ arm_r12 = 12,
+
+ arm_sp = 13,
+ arm_lr = 14,
+ arm_pc = 15,
+
+ arm_d0 = 256,
+ arm_d1 = 257,
+ arm_d2 = 258,
+ arm_d3 = 259,
+ arm_d4 = 260,
+ arm_d5 = 261,
+ arm_d6 = 262,
+ arm_d7 = 263,
+ arm_d8 = 264,
+ arm_d9 = 265,
+ arm_d10 = 266,
+ arm_d11 = 267,
+ arm_d12 = 268,
+ arm_d13 = 269,
+ arm_d14 = 270,
+};
+
+bool CompactUnwindInfo::CreateUnwindPlan_arm64(Target &target,
+ FunctionInfo &function_info,
+ UnwindPlan &unwind_plan,
+ Address pc_or_function_start) {
+ unwind_plan.SetSourceName("compact unwind info");
+ unwind_plan.SetSourcedFromCompiler(eLazyBoolYes);
+ unwind_plan.SetUnwindPlanValidAtAllInstructions(eLazyBoolNo);
+ unwind_plan.SetUnwindPlanForSignalTrap(eLazyBoolNo);
+ unwind_plan.SetRegisterKind(eRegisterKindEHFrame);
+
+ unwind_plan.SetLSDAAddress(function_info.lsda_address);
+ unwind_plan.SetPersonalityFunctionPtr(function_info.personality_ptr_address);
+
+ UnwindPlan::RowSP row(new UnwindPlan::Row);
+
+ const int wordsize = 8;
+ int mode = function_info.encoding & UNWIND_ARM64_MODE_MASK;
+
+ if (mode == UNWIND_ARM64_MODE_DWARF)
+ return false;
+
+ if (mode == UNWIND_ARM64_MODE_FRAMELESS) {
+ row->SetOffset(0);
+
+ uint32_t stack_size =
+ (EXTRACT_BITS(function_info.encoding,
+ UNWIND_ARM64_FRAMELESS_STACK_SIZE_MASK)) *
+ 16;
+
+ // Our previous Call Frame Address is the stack pointer plus the stack size
+ row->GetCFAValue().SetIsRegisterPlusOffset(arm64_eh_regnum::sp, stack_size);
+
+ // Our previous PC is in the LR
+ row->SetRegisterLocationToRegister(arm64_eh_regnum::pc, arm64_eh_regnum::ra,
+ true);
+
+ unwind_plan.AppendRow(row);
+ return true;
+ }
+
+ // Should not be possible
+ if (mode != UNWIND_ARM64_MODE_FRAME)
+ return false;
+
+ // mode == UNWIND_ARM64_MODE_FRAME
+
+ row->GetCFAValue().SetIsRegisterPlusOffset(arm64_eh_regnum::fp, 2 * wordsize);
+ row->SetOffset(0);
+ row->SetRegisterLocationToAtCFAPlusOffset(arm64_eh_regnum::fp, wordsize * -2,
+ true);
+ row->SetRegisterLocationToAtCFAPlusOffset(arm64_eh_regnum::pc, wordsize * -1,
+ true);
+ row->SetRegisterLocationToIsCFAPlusOffset(arm64_eh_regnum::sp, 0, true);
+
+ int reg_pairs_saved_count = 1;
+
+ uint32_t saved_register_bits = function_info.encoding & 0xfff;
+
+ if (saved_register_bits & UNWIND_ARM64_FRAME_X19_X20_PAIR) {
+ int cfa_offset = reg_pairs_saved_count * -2 * wordsize;
+ cfa_offset -= wordsize;
+ row->SetRegisterLocationToAtCFAPlusOffset(arm64_eh_regnum::x19, cfa_offset,
+ true);
+ cfa_offset -= wordsize;
+ row->SetRegisterLocationToAtCFAPlusOffset(arm64_eh_regnum::x20, cfa_offset,
+ true);
+ reg_pairs_saved_count++;
+ }
+
+ if (saved_register_bits & UNWIND_ARM64_FRAME_X21_X22_PAIR) {
+ int cfa_offset = reg_pairs_saved_count * -2 * wordsize;
+ cfa_offset -= wordsize;
+ row->SetRegisterLocationToAtCFAPlusOffset(arm64_eh_regnum::x21, cfa_offset,
+ true);
+ cfa_offset -= wordsize;
+ row->SetRegisterLocationToAtCFAPlusOffset(arm64_eh_regnum::x22, cfa_offset,
+ true);
+ reg_pairs_saved_count++;
+ }
+
+ if (saved_register_bits & UNWIND_ARM64_FRAME_X23_X24_PAIR) {
+ int cfa_offset = reg_pairs_saved_count * -2 * wordsize;
+ cfa_offset -= wordsize;
+ row->SetRegisterLocationToAtCFAPlusOffset(arm64_eh_regnum::x23, cfa_offset,
+ true);
+ cfa_offset -= wordsize;
+ row->SetRegisterLocationToAtCFAPlusOffset(arm64_eh_regnum::x24, cfa_offset,
+ true);
+ reg_pairs_saved_count++;
+ }
+
+ if (saved_register_bits & UNWIND_ARM64_FRAME_X25_X26_PAIR) {
+ int cfa_offset = reg_pairs_saved_count * -2 * wordsize;
+ cfa_offset -= wordsize;
+ row->SetRegisterLocationToAtCFAPlusOffset(arm64_eh_regnum::x25, cfa_offset,
+ true);
+ cfa_offset -= wordsize;
+ row->SetRegisterLocationToAtCFAPlusOffset(arm64_eh_regnum::x26, cfa_offset,
+ true);
+ reg_pairs_saved_count++;
+ }
+
+ if (saved_register_bits & UNWIND_ARM64_FRAME_X27_X28_PAIR) {
+ int cfa_offset = reg_pairs_saved_count * -2 * wordsize;
+ cfa_offset -= wordsize;
+ row->SetRegisterLocationToAtCFAPlusOffset(arm64_eh_regnum::x27, cfa_offset,
+ true);
+ cfa_offset -= wordsize;
+ row->SetRegisterLocationToAtCFAPlusOffset(arm64_eh_regnum::x28, cfa_offset,
+ true);
+ reg_pairs_saved_count++;
+ }
+
+ // If we use the v8-v15 regnums here, the unwinder will try to grab 128 bits
+ // off the stack;
+ // not sure if we have a good way to represent the 64-bitness of these saves.
+
+ if (saved_register_bits & UNWIND_ARM64_FRAME_D8_D9_PAIR) {
+ reg_pairs_saved_count++;
+ }
+ if (saved_register_bits & UNWIND_ARM64_FRAME_D10_D11_PAIR) {
+ reg_pairs_saved_count++;
+ }
+ if (saved_register_bits & UNWIND_ARM64_FRAME_D12_D13_PAIR) {
+ reg_pairs_saved_count++;
+ }
+ if (saved_register_bits & UNWIND_ARM64_FRAME_D14_D15_PAIR) {
+ reg_pairs_saved_count++;
+ }
+
+ unwind_plan.AppendRow(row);
+ return true;
+}
+
+bool CompactUnwindInfo::CreateUnwindPlan_armv7(Target &target,
+ FunctionInfo &function_info,
+ UnwindPlan &unwind_plan,
+ Address pc_or_function_start) {
+ unwind_plan.SetSourceName("compact unwind info");
+ unwind_plan.SetSourcedFromCompiler(eLazyBoolYes);
+ unwind_plan.SetUnwindPlanValidAtAllInstructions(eLazyBoolNo);
+ unwind_plan.SetUnwindPlanForSignalTrap(eLazyBoolNo);
+ unwind_plan.SetRegisterKind(eRegisterKindEHFrame);
+
+ unwind_plan.SetLSDAAddress(function_info.lsda_address);
+ unwind_plan.SetPersonalityFunctionPtr(function_info.personality_ptr_address);
+
+ UnwindPlan::RowSP row(new UnwindPlan::Row);
+
+ const int wordsize = 4;
+ int mode = function_info.encoding & UNWIND_ARM_MODE_MASK;
+
+ if (mode == UNWIND_ARM_MODE_DWARF)
+ return false;
+
+ uint32_t stack_adjust = (EXTRACT_BITS(function_info.encoding,
+ UNWIND_ARM_FRAME_STACK_ADJUST_MASK)) *
+ wordsize;
+
+ row->GetCFAValue().SetIsRegisterPlusOffset(arm_r7,
+ (2 * wordsize) + stack_adjust);
+ row->SetOffset(0);
+ row->SetRegisterLocationToAtCFAPlusOffset(
+ arm_r7, (wordsize * -2) - stack_adjust, true);
+ row->SetRegisterLocationToAtCFAPlusOffset(
+ arm_pc, (wordsize * -1) - stack_adjust, true);
+ row->SetRegisterLocationToIsCFAPlusOffset(arm_sp, 0, true);
+
+ int cfa_offset = -stack_adjust - (2 * wordsize);
+
+ uint32_t saved_register_bits = function_info.encoding & 0xff;
+
+ if (saved_register_bits & UNWIND_ARM_FRAME_FIRST_PUSH_R6) {
+ cfa_offset -= wordsize;
+ row->SetRegisterLocationToAtCFAPlusOffset(arm_r6, cfa_offset, true);
+ }
+
+ if (saved_register_bits & UNWIND_ARM_FRAME_FIRST_PUSH_R5) {
+ cfa_offset -= wordsize;
+ row->SetRegisterLocationToAtCFAPlusOffset(arm_r5, cfa_offset, true);
+ }
+
+ if (saved_register_bits & UNWIND_ARM_FRAME_FIRST_PUSH_R4) {
+ cfa_offset -= wordsize;
+ row->SetRegisterLocationToAtCFAPlusOffset(arm_r4, cfa_offset, true);
+ }
+
+ if (saved_register_bits & UNWIND_ARM_FRAME_SECOND_PUSH_R12) {
+ cfa_offset -= wordsize;
+ row->SetRegisterLocationToAtCFAPlusOffset(arm_r12, cfa_offset, true);
+ }
+
+ if (saved_register_bits & UNWIND_ARM_FRAME_SECOND_PUSH_R11) {
+ cfa_offset -= wordsize;
+ row->SetRegisterLocationToAtCFAPlusOffset(arm_r11, cfa_offset, true);
+ }
+
+ if (saved_register_bits & UNWIND_ARM_FRAME_SECOND_PUSH_R10) {
+ cfa_offset -= wordsize;
+ row->SetRegisterLocationToAtCFAPlusOffset(arm_r10, cfa_offset, true);
+ }
+
+ if (saved_register_bits & UNWIND_ARM_FRAME_SECOND_PUSH_R9) {
+ cfa_offset -= wordsize;
+ row->SetRegisterLocationToAtCFAPlusOffset(arm_r9, cfa_offset, true);
+ }
+
+ if (saved_register_bits & UNWIND_ARM_FRAME_SECOND_PUSH_R8) {
+ cfa_offset -= wordsize;
+ row->SetRegisterLocationToAtCFAPlusOffset(arm_r8, cfa_offset, true);
+ }
+
+ if (mode == UNWIND_ARM_MODE_FRAME_D) {
+ uint32_t d_reg_bits =
+ EXTRACT_BITS(function_info.encoding, UNWIND_ARM_FRAME_D_REG_COUNT_MASK);
+ switch (d_reg_bits) {
+ case 0:
+ // vpush {d8}
+ cfa_offset -= 8;
+ row->SetRegisterLocationToAtCFAPlusOffset(arm_d8, cfa_offset, true);
+ break;
+ case 1:
+ // vpush {d10}
+ // vpush {d8}
+ cfa_offset -= 8;
+ row->SetRegisterLocationToAtCFAPlusOffset(arm_d10, cfa_offset, true);
+ cfa_offset -= 8;
+ row->SetRegisterLocationToAtCFAPlusOffset(arm_d8, cfa_offset, true);
+ break;
+ case 2:
+ // vpush {d12}
+ // vpush {d10}
+ // vpush {d8}
+ cfa_offset -= 8;
+ row->SetRegisterLocationToAtCFAPlusOffset(arm_d12, cfa_offset, true);
+ cfa_offset -= 8;
+ row->SetRegisterLocationToAtCFAPlusOffset(arm_d10, cfa_offset, true);
+ cfa_offset -= 8;
+ row->SetRegisterLocationToAtCFAPlusOffset(arm_d8, cfa_offset, true);
+ break;
+ case 3:
+ // vpush {d14}
+ // vpush {d12}
+ // vpush {d10}
+ // vpush {d8}
+ cfa_offset -= 8;
+ row->SetRegisterLocationToAtCFAPlusOffset(arm_d14, cfa_offset, true);
+ cfa_offset -= 8;
+ row->SetRegisterLocationToAtCFAPlusOffset(arm_d12, cfa_offset, true);
+ cfa_offset -= 8;
+ row->SetRegisterLocationToAtCFAPlusOffset(arm_d10, cfa_offset, true);
+ cfa_offset -= 8;
+ row->SetRegisterLocationToAtCFAPlusOffset(arm_d8, cfa_offset, true);
+ break;
+ case 4:
+ // vpush {d14}
+ // vpush {d12}
+ // sp = (sp - 24) & (-16);
+ // vst {d8, d9, d10}
+ cfa_offset -= 8;
+ row->SetRegisterLocationToAtCFAPlusOffset(arm_d14, cfa_offset, true);
+ cfa_offset -= 8;
+ row->SetRegisterLocationToAtCFAPlusOffset(arm_d12, cfa_offset, true);
+
+ // FIXME we don't have a way to represent reg saves at an specific
+ // alignment short of
+ // coming up with some DWARF location description.
+
+ break;
+ case 5:
+ // vpush {d14}
+ // sp = (sp - 40) & (-16);
+ // vst {d8, d9, d10, d11}
+ // vst {d12}
+
+ cfa_offset -= 8;
+ row->SetRegisterLocationToAtCFAPlusOffset(arm_d14, cfa_offset, true);
+
+ // FIXME we don't have a way to represent reg saves at an specific
+ // alignment short of
+ // coming up with some DWARF location description.
+
+ break;
+ case 6:
+ // sp = (sp - 56) & (-16);
+ // vst {d8, d9, d10, d11}
+ // vst {d12, d13, d14}
+
+ // FIXME we don't have a way to represent reg saves at an specific
+ // alignment short of
+ // coming up with some DWARF location description.
+
+ break;
+ case 7:
+ // sp = (sp - 64) & (-16);
+ // vst {d8, d9, d10, d11}
+ // vst {d12, d13, d14, d15}
+
+ // FIXME we don't have a way to represent reg saves at an specific
+ // alignment short of
+ // coming up with some DWARF location description.
+
+ break;
+ }
+ }
+
+ unwind_plan.AppendRow(row);
+ return true;
+}
generated by cgit v1.2.3 (git 2.25.1) at 2025-10-08 22:56:03 +0000