2010-06-09 00:52:24 +08:00
|
|
|
//===-- DWARFCallFrameInfo.cpp ----------------------------------*- C++ -*-===//
|
|
|
|
//
|
|
|
|
// The LLVM Compiler Infrastructure
|
|
|
|
//
|
|
|
|
// This file is distributed under the University of Illinois Open Source
|
|
|
|
// License. See LICENSE.TXT for details.
|
|
|
|
//
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
|
|
|
|
// C Includes
|
|
|
|
// C++ Includes
|
|
|
|
#include <list>
|
|
|
|
|
|
|
|
#include "lldb/Core/ArchSpec.h"
|
2016-09-07 04:57:50 +08:00
|
|
|
#include "lldb/Core/Log.h"
|
2010-06-09 00:52:24 +08:00
|
|
|
#include "lldb/Core/Module.h"
|
2012-01-05 11:57:59 +08:00
|
|
|
#include "lldb/Core/Section.h"
|
2016-09-07 04:57:50 +08:00
|
|
|
#include "lldb/Core/Section.h"
|
2013-03-21 05:57:42 +08:00
|
|
|
#include "lldb/Core/Timer.h"
|
2012-01-05 11:57:59 +08:00
|
|
|
#include "lldb/Host/Host.h"
|
|
|
|
#include "lldb/Symbol/DWARFCallFrameInfo.h"
|
2010-06-09 00:52:24 +08:00
|
|
|
#include "lldb/Symbol/ObjectFile.h"
|
2012-01-05 11:57:59 +08:00
|
|
|
#include "lldb/Symbol/UnwindPlan.h"
|
2010-06-09 00:52:24 +08:00
|
|
|
#include "lldb/Target/RegisterContext.h"
|
|
|
|
#include "lldb/Target/Thread.h"
|
|
|
|
|
|
|
|
using namespace lldb;
|
|
|
|
using namespace lldb_private;
|
|
|
|
|
2016-09-07 04:57:50 +08:00
|
|
|
DWARFCallFrameInfo::DWARFCallFrameInfo(ObjectFile &objfile,
|
|
|
|
SectionSP §ion_sp,
|
|
|
|
lldb::RegisterKind reg_kind,
|
|
|
|
bool is_eh_frame)
|
|
|
|
: m_objfile(objfile), m_section_sp(section_sp),
|
|
|
|
m_reg_kind(reg_kind), // The flavor of registers that the CFI data uses
|
|
|
|
// (enum RegisterKind)
|
|
|
|
m_flags(), m_cie_map(), m_cfi_data(), m_cfi_data_initialized(false),
|
|
|
|
m_fde_index(), m_fde_index_initialized(false),
|
|
|
|
m_is_eh_frame(is_eh_frame) {}
|
|
|
|
|
|
|
|
DWARFCallFrameInfo::~DWARFCallFrameInfo() {}
|
|
|
|
|
|
|
|
bool DWARFCallFrameInfo::GetUnwindPlan(Address addr, UnwindPlan &unwind_plan) {
|
|
|
|
FDEEntryMap::Entry fde_entry;
|
|
|
|
|
|
|
|
// Make sure that the Address we're searching for is the same object file
|
|
|
|
// as this DWARFCallFrameInfo, we only store File offsets in m_fde_index.
|
|
|
|
ModuleSP module_sp = addr.GetModule();
|
|
|
|
if (module_sp.get() == nullptr || module_sp->GetObjectFile() == nullptr ||
|
|
|
|
module_sp->GetObjectFile() != &m_objfile)
|
|
|
|
return false;
|
2010-06-09 00:52:24 +08:00
|
|
|
|
2016-09-07 04:57:50 +08:00
|
|
|
if (GetFDEEntryByFileAddress(addr.GetFileAddress(), fde_entry) == false)
|
|
|
|
return false;
|
|
|
|
return FDEToUnwindPlan(fde_entry.data, addr, unwind_plan);
|
2010-06-09 00:52:24 +08:00
|
|
|
}
|
|
|
|
|
2016-09-07 04:57:50 +08:00
|
|
|
bool DWARFCallFrameInfo::GetAddressRange(Address addr, AddressRange &range) {
|
2010-06-09 00:52:24 +08:00
|
|
|
|
2016-09-07 04:57:50 +08:00
|
|
|
// Make sure that the Address we're searching for is the same object file
|
|
|
|
// as this DWARFCallFrameInfo, we only store File offsets in m_fde_index.
|
|
|
|
ModuleSP module_sp = addr.GetModule();
|
|
|
|
if (module_sp.get() == nullptr || module_sp->GetObjectFile() == nullptr ||
|
|
|
|
module_sp->GetObjectFile() != &m_objfile)
|
|
|
|
return false;
|
2013-03-21 05:57:42 +08:00
|
|
|
|
2016-09-07 04:57:50 +08:00
|
|
|
if (m_section_sp.get() == nullptr || m_section_sp->IsEncrypted())
|
|
|
|
return false;
|
|
|
|
GetFDEIndex();
|
|
|
|
FDEEntryMap::Entry *fde_entry =
|
|
|
|
m_fde_index.FindEntryThatContains(addr.GetFileAddress());
|
|
|
|
if (!fde_entry)
|
|
|
|
return false;
|
2010-06-09 00:52:24 +08:00
|
|
|
|
2016-09-07 04:57:50 +08:00
|
|
|
range = AddressRange(fde_entry->base, fde_entry->size,
|
|
|
|
m_objfile.GetSectionList());
|
|
|
|
return true;
|
2010-06-09 00:52:24 +08:00
|
|
|
}
|
|
|
|
|
2016-09-07 04:57:50 +08:00
|
|
|
bool DWARFCallFrameInfo::GetFDEEntryByFileAddress(
|
|
|
|
addr_t file_addr, FDEEntryMap::Entry &fde_entry) {
|
|
|
|
if (m_section_sp.get() == nullptr || m_section_sp->IsEncrypted())
|
|
|
|
return false;
|
2010-06-09 00:52:24 +08:00
|
|
|
|
2016-09-07 04:57:50 +08:00
|
|
|
GetFDEIndex();
|
2010-06-09 00:52:24 +08:00
|
|
|
|
2016-09-07 04:57:50 +08:00
|
|
|
if (m_fde_index.IsEmpty())
|
|
|
|
return false;
|
2010-06-09 00:52:24 +08:00
|
|
|
|
2016-09-07 04:57:50 +08:00
|
|
|
FDEEntryMap::Entry *fde = m_fde_index.FindEntryThatContains(file_addr);
|
2010-06-09 00:52:24 +08:00
|
|
|
|
2016-09-07 04:57:50 +08:00
|
|
|
if (fde == nullptr)
|
|
|
|
return false;
|
2013-03-21 05:57:42 +08:00
|
|
|
|
2016-09-07 04:57:50 +08:00
|
|
|
fde_entry = *fde;
|
|
|
|
return true;
|
2010-06-09 00:52:24 +08:00
|
|
|
}
|
|
|
|
|
2016-09-07 04:57:50 +08:00
|
|
|
void DWARFCallFrameInfo::GetFunctionAddressAndSizeVector(
|
|
|
|
FunctionAddressAndSizeVector &function_info) {
|
|
|
|
GetFDEIndex();
|
|
|
|
const size_t count = m_fde_index.GetSize();
|
|
|
|
function_info.Clear();
|
|
|
|
if (count > 0)
|
|
|
|
function_info.Reserve(count);
|
|
|
|
for (size_t i = 0; i < count; ++i) {
|
|
|
|
const FDEEntryMap::Entry *func_offset_data_entry =
|
|
|
|
m_fde_index.GetEntryAtIndex(i);
|
|
|
|
if (func_offset_data_entry) {
|
|
|
|
FunctionAddressAndSizeVector::Entry function_offset_entry(
|
|
|
|
func_offset_data_entry->base, func_offset_data_entry->size);
|
|
|
|
function_info.Append(function_offset_entry);
|
2013-03-21 11:36:01 +08:00
|
|
|
}
|
2016-09-07 04:57:50 +08:00
|
|
|
}
|
2013-03-21 11:36:01 +08:00
|
|
|
}
|
|
|
|
|
2016-09-07 04:57:50 +08:00
|
|
|
const DWARFCallFrameInfo::CIE *
|
|
|
|
DWARFCallFrameInfo::GetCIE(dw_offset_t cie_offset) {
|
|
|
|
cie_map_t::iterator pos = m_cie_map.find(cie_offset);
|
2010-06-09 00:52:24 +08:00
|
|
|
|
2016-09-07 04:57:50 +08:00
|
|
|
if (pos != m_cie_map.end()) {
|
|
|
|
// Parse and cache the CIE
|
|
|
|
if (pos->second.get() == nullptr)
|
|
|
|
pos->second = ParseCIE(cie_offset);
|
2010-06-09 00:52:24 +08:00
|
|
|
|
2016-09-07 04:57:50 +08:00
|
|
|
return pos->second.get();
|
|
|
|
}
|
|
|
|
return nullptr;
|
2010-06-09 00:52:24 +08:00
|
|
|
}
|
|
|
|
|
2010-09-10 15:49:16 +08:00
|
|
|
DWARFCallFrameInfo::CIESP
|
2016-09-07 04:57:50 +08:00
|
|
|
DWARFCallFrameInfo::ParseCIE(const dw_offset_t cie_offset) {
|
|
|
|
CIESP cie_sp(new CIE(cie_offset));
|
|
|
|
lldb::offset_t offset = cie_offset;
|
|
|
|
if (m_cfi_data_initialized == false)
|
|
|
|
GetCFIData();
|
|
|
|
uint32_t length = m_cfi_data.GetU32(&offset);
|
|
|
|
dw_offset_t cie_id, end_offset;
|
|
|
|
bool is_64bit = (length == UINT32_MAX);
|
|
|
|
if (is_64bit) {
|
|
|
|
length = m_cfi_data.GetU64(&offset);
|
|
|
|
cie_id = m_cfi_data.GetU64(&offset);
|
|
|
|
end_offset = cie_offset + length + 12;
|
|
|
|
} else {
|
|
|
|
cie_id = m_cfi_data.GetU32(&offset);
|
|
|
|
end_offset = cie_offset + length + 4;
|
|
|
|
}
|
|
|
|
if (length > 0 && ((!m_is_eh_frame && cie_id == UINT32_MAX) ||
|
|
|
|
(m_is_eh_frame && cie_id == 0ul))) {
|
|
|
|
size_t i;
|
|
|
|
// cie.offset = cie_offset;
|
|
|
|
// cie.length = length;
|
|
|
|
// cie.cieID = cieID;
|
|
|
|
cie_sp->ptr_encoding = DW_EH_PE_absptr; // default
|
|
|
|
cie_sp->version = m_cfi_data.GetU8(&offset);
|
|
|
|
|
|
|
|
for (i = 0; i < CFI_AUG_MAX_SIZE; ++i) {
|
|
|
|
cie_sp->augmentation[i] = m_cfi_data.GetU8(&offset);
|
|
|
|
if (cie_sp->augmentation[i] == '\0') {
|
|
|
|
// Zero out remaining bytes in augmentation string
|
|
|
|
for (size_t j = i + 1; j < CFI_AUG_MAX_SIZE; ++j)
|
|
|
|
cie_sp->augmentation[j] = '\0';
|
|
|
|
|
|
|
|
break;
|
|
|
|
}
|
2014-08-26 05:39:30 +08:00
|
|
|
}
|
2010-06-09 00:52:24 +08:00
|
|
|
|
2016-09-07 04:57:50 +08:00
|
|
|
if (i == CFI_AUG_MAX_SIZE &&
|
|
|
|
cie_sp->augmentation[CFI_AUG_MAX_SIZE - 1] != '\0') {
|
|
|
|
Host::SystemLog(Host::eSystemLogError,
|
|
|
|
"CIE parse error: CIE augmentation string was too large "
|
|
|
|
"for the fixed sized buffer of %d bytes.\n",
|
|
|
|
CFI_AUG_MAX_SIZE);
|
|
|
|
return cie_sp;
|
|
|
|
}
|
|
|
|
cie_sp->code_align = (uint32_t)m_cfi_data.GetULEB128(&offset);
|
|
|
|
cie_sp->data_align = (int32_t)m_cfi_data.GetSLEB128(&offset);
|
|
|
|
cie_sp->return_addr_reg_num = m_cfi_data.GetU8(&offset);
|
|
|
|
|
|
|
|
if (cie_sp->augmentation[0]) {
|
|
|
|
// Get the length of the eh_frame augmentation data
|
|
|
|
// which starts with a ULEB128 length in bytes
|
|
|
|
const size_t aug_data_len = (size_t)m_cfi_data.GetULEB128(&offset);
|
|
|
|
const size_t aug_data_end = offset + aug_data_len;
|
|
|
|
const size_t aug_str_len = strlen(cie_sp->augmentation);
|
|
|
|
// A 'z' may be present as the first character of the string.
|
|
|
|
// If present, the Augmentation Data field shall be present.
|
|
|
|
// The contents of the Augmentation Data shall be interpreted
|
|
|
|
// according to other characters in the Augmentation String.
|
|
|
|
if (cie_sp->augmentation[0] == 'z') {
|
|
|
|
// Extract the Augmentation Data
|
|
|
|
size_t aug_str_idx = 0;
|
|
|
|
for (aug_str_idx = 1; aug_str_idx < aug_str_len; aug_str_idx++) {
|
|
|
|
char aug = cie_sp->augmentation[aug_str_idx];
|
|
|
|
switch (aug) {
|
|
|
|
case 'L':
|
|
|
|
// Indicates the presence of one argument in the
|
|
|
|
// Augmentation Data of the CIE, and a corresponding
|
|
|
|
// argument in the Augmentation Data of the FDE. The
|
|
|
|
// argument in the Augmentation Data of the CIE is
|
|
|
|
// 1-byte and represents the pointer encoding used
|
|
|
|
// for the argument in the Augmentation Data of the
|
|
|
|
// FDE, which is the address of a language-specific
|
|
|
|
// data area (LSDA). The size of the LSDA pointer is
|
|
|
|
// specified by the pointer encoding used.
|
|
|
|
cie_sp->lsda_addr_encoding = m_cfi_data.GetU8(&offset);
|
|
|
|
break;
|
2010-06-09 00:52:24 +08:00
|
|
|
|
2016-09-07 04:57:50 +08:00
|
|
|
case 'P':
|
|
|
|
// Indicates the presence of two arguments in the
|
|
|
|
// Augmentation Data of the CIE. The first argument
|
|
|
|
// is 1-byte and represents the pointer encoding
|
|
|
|
// used for the second argument, which is the
|
|
|
|
// address of a personality routine handler. The
|
|
|
|
// size of the personality routine pointer is
|
|
|
|
// specified by the pointer encoding used.
|
|
|
|
//
|
|
|
|
// The address of the personality function will
|
|
|
|
// be stored at this location. Pre-execution, it
|
|
|
|
// will be all zero's so don't read it until we're
|
|
|
|
// trying to do an unwind & the reloc has been
|
|
|
|
// resolved.
|
2010-06-09 00:52:24 +08:00
|
|
|
{
|
2016-09-07 04:57:50 +08:00
|
|
|
uint8_t arg_ptr_encoding = m_cfi_data.GetU8(&offset);
|
|
|
|
const lldb::addr_t pc_rel_addr = m_section_sp->GetFileAddress();
|
|
|
|
cie_sp->personality_loc = m_cfi_data.GetGNUEHPointer(
|
|
|
|
&offset, arg_ptr_encoding, pc_rel_addr, LLDB_INVALID_ADDRESS,
|
|
|
|
LLDB_INVALID_ADDRESS);
|
2010-06-09 00:52:24 +08:00
|
|
|
}
|
2016-09-07 04:57:50 +08:00
|
|
|
break;
|
2010-06-09 00:52:24 +08:00
|
|
|
|
2016-09-07 04:57:50 +08:00
|
|
|
case 'R':
|
|
|
|
// A 'R' may be present at any position after the
|
|
|
|
// first character of the string. The Augmentation
|
|
|
|
// Data shall include a 1 byte argument that
|
|
|
|
// represents the pointer encoding for the address
|
|
|
|
// pointers used in the FDE.
|
|
|
|
// Example: 0x1B == DW_EH_PE_pcrel | DW_EH_PE_sdata4
|
|
|
|
cie_sp->ptr_encoding = m_cfi_data.GetU8(&offset);
|
|
|
|
break;
|
|
|
|
}
|
2010-06-09 00:52:24 +08:00
|
|
|
}
|
2016-09-07 04:57:50 +08:00
|
|
|
} else if (strcmp(cie_sp->augmentation, "eh") == 0) {
|
|
|
|
// If the Augmentation string has the value "eh", then
|
|
|
|
// the EH Data field shall be present
|
|
|
|
}
|
|
|
|
|
|
|
|
// Set the offset to be the end of the augmentation data just in case
|
|
|
|
// we didn't understand any of the data.
|
|
|
|
offset = (uint32_t)aug_data_end;
|
|
|
|
}
|
2010-09-10 15:49:16 +08:00
|
|
|
|
2016-09-07 04:57:50 +08:00
|
|
|
if (end_offset > offset) {
|
|
|
|
cie_sp->inst_offset = offset;
|
|
|
|
cie_sp->inst_length = end_offset - offset;
|
|
|
|
}
|
|
|
|
while (offset < end_offset) {
|
|
|
|
uint8_t inst = m_cfi_data.GetU8(&offset);
|
|
|
|
uint8_t primary_opcode = inst & 0xC0;
|
|
|
|
uint8_t extended_opcode = inst & 0x3F;
|
|
|
|
|
|
|
|
if (!HandleCommonDwarfOpcode(primary_opcode, extended_opcode,
|
|
|
|
cie_sp->data_align, offset,
|
|
|
|
cie_sp->initial_row))
|
|
|
|
break; // Stop if we hit an unrecognized opcode
|
2010-06-09 00:52:24 +08:00
|
|
|
}
|
2016-09-07 04:57:50 +08:00
|
|
|
}
|
2010-06-09 00:52:24 +08:00
|
|
|
|
2016-09-07 04:57:50 +08:00
|
|
|
return cie_sp;
|
2010-06-09 00:52:24 +08:00
|
|
|
}
|
|
|
|
|
2016-09-07 04:57:50 +08:00
|
|
|
void DWARFCallFrameInfo::GetCFIData() {
|
|
|
|
if (m_cfi_data_initialized == false) {
|
|
|
|
Log *log(GetLogIfAllCategoriesSet(LIBLLDB_LOG_UNWIND));
|
|
|
|
if (log)
|
|
|
|
m_objfile.GetModule()->LogMessage(log, "Reading EH frame info");
|
|
|
|
m_objfile.ReadSectionData(m_section_sp.get(), m_cfi_data);
|
|
|
|
m_cfi_data_initialized = true;
|
|
|
|
}
|
2011-12-29 08:05:26 +08:00
|
|
|
}
|
2016-09-07 04:57:50 +08:00
|
|
|
// Scan through the eh_frame or debug_frame section looking for FDEs and noting
|
|
|
|
// the start/end addresses
|
|
|
|
// of the functions and a pointer back to the function's FDE for later
|
|
|
|
// expansion.
|
2010-09-10 15:49:16 +08:00
|
|
|
// Internalize CIEs as we come across them.
|
|
|
|
|
2016-09-07 04:57:50 +08:00
|
|
|
void DWARFCallFrameInfo::GetFDEIndex() {
|
|
|
|
if (m_section_sp.get() == nullptr || m_section_sp->IsEncrypted())
|
|
|
|
return;
|
|
|
|
|
|
|
|
if (m_fde_index_initialized)
|
|
|
|
return;
|
|
|
|
|
|
|
|
std::lock_guard<std::mutex> guard(m_fde_index_mutex);
|
|
|
|
|
|
|
|
if (m_fde_index_initialized) // if two threads hit the locker
|
|
|
|
return;
|
|
|
|
|
|
|
|
Timer scoped_timer(LLVM_PRETTY_FUNCTION, "%s - %s", LLVM_PRETTY_FUNCTION,
|
|
|
|
m_objfile.GetFileSpec().GetFilename().AsCString(""));
|
|
|
|
|
|
|
|
bool clear_address_zeroth_bit = false;
|
|
|
|
ArchSpec arch;
|
|
|
|
if (m_objfile.GetArchitecture(arch)) {
|
|
|
|
if (arch.GetTriple().getArch() == llvm::Triple::arm ||
|
|
|
|
arch.GetTriple().getArch() == llvm::Triple::thumb)
|
|
|
|
clear_address_zeroth_bit = true;
|
|
|
|
}
|
|
|
|
|
|
|
|
lldb::offset_t offset = 0;
|
|
|
|
if (m_cfi_data_initialized == false)
|
|
|
|
GetCFIData();
|
|
|
|
while (m_cfi_data.ValidOffsetForDataOfSize(offset, 8)) {
|
|
|
|
const dw_offset_t current_entry = offset;
|
|
|
|
dw_offset_t cie_id, next_entry, cie_offset;
|
|
|
|
uint32_t len = m_cfi_data.GetU32(&offset);
|
|
|
|
bool is_64bit = (len == UINT32_MAX);
|
|
|
|
if (is_64bit) {
|
|
|
|
len = m_cfi_data.GetU64(&offset);
|
|
|
|
cie_id = m_cfi_data.GetU64(&offset);
|
|
|
|
next_entry = current_entry + len + 12;
|
|
|
|
cie_offset = current_entry + 12 - cie_id;
|
|
|
|
} else {
|
|
|
|
cie_id = m_cfi_data.GetU32(&offset);
|
|
|
|
next_entry = current_entry + len + 4;
|
|
|
|
cie_offset = current_entry + 4 - cie_id;
|
|
|
|
}
|
2016-05-19 13:13:57 +08:00
|
|
|
|
2016-09-07 04:57:50 +08:00
|
|
|
if (next_entry > m_cfi_data.GetByteSize() + 1) {
|
|
|
|
Host::SystemLog(Host::eSystemLogError, "error: Invalid fde/cie next "
|
|
|
|
"entry offset of 0x%x found in "
|
|
|
|
"cie/fde at 0x%x\n",
|
|
|
|
next_entry, current_entry);
|
|
|
|
// Don't trust anything in this eh_frame section if we find blatantly
|
|
|
|
// invalid data.
|
|
|
|
m_fde_index.Clear();
|
|
|
|
m_fde_index_initialized = true;
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
if (cie_offset > m_cfi_data.GetByteSize()) {
|
|
|
|
Host::SystemLog(
|
|
|
|
Host::eSystemLogError,
|
|
|
|
"error: Invalid cie offset of 0x%x found in cie/fde at 0x%x\n",
|
|
|
|
cie_offset, current_entry);
|
|
|
|
// Don't trust anything in this eh_frame section if we find blatantly
|
|
|
|
// invalid data.
|
|
|
|
m_fde_index.Clear();
|
|
|
|
m_fde_index_initialized = true;
|
|
|
|
return;
|
|
|
|
}
|
2010-10-26 20:01:35 +08:00
|
|
|
|
2016-09-07 04:57:50 +08:00
|
|
|
if (cie_id == 0 || cie_id == UINT32_MAX || len == 0) {
|
|
|
|
m_cie_map[current_entry] = ParseCIE(current_entry);
|
|
|
|
offset = next_entry;
|
|
|
|
continue;
|
|
|
|
}
|
2013-03-21 05:57:42 +08:00
|
|
|
|
2016-09-07 04:57:50 +08:00
|
|
|
const CIE *cie = GetCIE(cie_offset);
|
|
|
|
if (cie) {
|
|
|
|
const lldb::addr_t pc_rel_addr = m_section_sp->GetFileAddress();
|
|
|
|
const lldb::addr_t text_addr = LLDB_INVALID_ADDRESS;
|
|
|
|
const lldb::addr_t data_addr = LLDB_INVALID_ADDRESS;
|
|
|
|
|
|
|
|
lldb::addr_t addr = m_cfi_data.GetGNUEHPointer(
|
|
|
|
&offset, cie->ptr_encoding, pc_rel_addr, text_addr, data_addr);
|
|
|
|
if (clear_address_zeroth_bit)
|
|
|
|
addr &= ~1ull;
|
|
|
|
|
|
|
|
lldb::addr_t length = m_cfi_data.GetGNUEHPointer(
|
|
|
|
&offset, cie->ptr_encoding & DW_EH_PE_MASK_ENCODING, pc_rel_addr,
|
|
|
|
text_addr, data_addr);
|
|
|
|
FDEEntryMap::Entry fde(addr, length, current_entry);
|
|
|
|
m_fde_index.Append(fde);
|
|
|
|
} else {
|
|
|
|
Host::SystemLog(Host::eSystemLogError, "error: unable to find CIE at "
|
|
|
|
"0x%8.8x for cie_id = 0x%8.8x for "
|
|
|
|
"entry at 0x%8.8x.\n",
|
|
|
|
cie_offset, cie_id, current_entry);
|
2016-06-07 10:19:54 +08:00
|
|
|
}
|
2016-09-07 04:57:50 +08:00
|
|
|
offset = next_entry;
|
|
|
|
}
|
|
|
|
m_fde_index.Sort();
|
|
|
|
m_fde_index_initialized = true;
|
|
|
|
}
|
2016-06-07 10:19:54 +08:00
|
|
|
|
2016-09-07 04:57:50 +08:00
|
|
|
bool DWARFCallFrameInfo::FDEToUnwindPlan(dw_offset_t dwarf_offset,
|
|
|
|
Address startaddr,
|
|
|
|
UnwindPlan &unwind_plan) {
|
|
|
|
Log *log = GetLogIfAllCategoriesSet(LIBLLDB_LOG_UNWIND);
|
|
|
|
lldb::offset_t offset = dwarf_offset;
|
|
|
|
lldb::offset_t current_entry = offset;
|
|
|
|
|
|
|
|
if (m_section_sp.get() == nullptr || m_section_sp->IsEncrypted())
|
|
|
|
return false;
|
|
|
|
|
|
|
|
if (m_cfi_data_initialized == false)
|
|
|
|
GetCFIData();
|
|
|
|
|
|
|
|
uint32_t length = m_cfi_data.GetU32(&offset);
|
|
|
|
dw_offset_t cie_offset;
|
|
|
|
bool is_64bit = (length == UINT32_MAX);
|
|
|
|
if (is_64bit) {
|
|
|
|
length = m_cfi_data.GetU64(&offset);
|
|
|
|
cie_offset = m_cfi_data.GetU64(&offset);
|
|
|
|
} else {
|
|
|
|
cie_offset = m_cfi_data.GetU32(&offset);
|
|
|
|
}
|
|
|
|
|
|
|
|
assert(cie_offset != 0 && cie_offset != UINT32_MAX);
|
|
|
|
|
|
|
|
// Translate the CIE_id from the eh_frame format, which
|
|
|
|
// is relative to the FDE offset, into a __eh_frame section
|
|
|
|
// offset
|
|
|
|
if (m_is_eh_frame) {
|
|
|
|
unwind_plan.SetSourceName("eh_frame CFI");
|
|
|
|
cie_offset = current_entry + (is_64bit ? 12 : 4) - cie_offset;
|
|
|
|
unwind_plan.SetUnwindPlanValidAtAllInstructions(eLazyBoolNo);
|
|
|
|
} else {
|
|
|
|
unwind_plan.SetSourceName("DWARF CFI");
|
|
|
|
// In theory the debug_frame info should be valid at all call sites
|
|
|
|
// ("asynchronous unwind info" as it is sometimes called) but in practice
|
|
|
|
// gcc et al all emit call frame info for the prologue and call sites, but
|
|
|
|
// not for the epilogue or all the other locations during the function
|
|
|
|
// reliably.
|
|
|
|
unwind_plan.SetUnwindPlanValidAtAllInstructions(eLazyBoolNo);
|
|
|
|
}
|
|
|
|
unwind_plan.SetSourcedFromCompiler(eLazyBoolYes);
|
|
|
|
|
|
|
|
const CIE *cie = GetCIE(cie_offset);
|
|
|
|
assert(cie != nullptr);
|
|
|
|
|
|
|
|
const dw_offset_t end_offset = current_entry + length + (is_64bit ? 12 : 4);
|
|
|
|
|
|
|
|
const lldb::addr_t pc_rel_addr = m_section_sp->GetFileAddress();
|
|
|
|
const lldb::addr_t text_addr = LLDB_INVALID_ADDRESS;
|
|
|
|
const lldb::addr_t data_addr = LLDB_INVALID_ADDRESS;
|
|
|
|
lldb::addr_t range_base = m_cfi_data.GetGNUEHPointer(
|
|
|
|
&offset, cie->ptr_encoding, pc_rel_addr, text_addr, data_addr);
|
|
|
|
lldb::addr_t range_len = m_cfi_data.GetGNUEHPointer(
|
|
|
|
&offset, cie->ptr_encoding & DW_EH_PE_MASK_ENCODING, pc_rel_addr,
|
|
|
|
text_addr, data_addr);
|
|
|
|
AddressRange range(range_base, m_objfile.GetAddressByteSize(),
|
|
|
|
m_objfile.GetSectionList());
|
|
|
|
range.SetByteSize(range_len);
|
|
|
|
|
|
|
|
addr_t lsda_data_file_address = LLDB_INVALID_ADDRESS;
|
|
|
|
|
|
|
|
if (cie->augmentation[0] == 'z') {
|
|
|
|
uint32_t aug_data_len = (uint32_t)m_cfi_data.GetULEB128(&offset);
|
|
|
|
if (aug_data_len != 0 && cie->lsda_addr_encoding != DW_EH_PE_omit) {
|
|
|
|
offset_t saved_offset = offset;
|
|
|
|
lsda_data_file_address = m_cfi_data.GetGNUEHPointer(
|
|
|
|
&offset, cie->lsda_addr_encoding, pc_rel_addr, text_addr, data_addr);
|
|
|
|
if (offset - saved_offset != aug_data_len) {
|
|
|
|
// There is more in the augmentation region than we know how to process;
|
|
|
|
// don't read anything.
|
|
|
|
lsda_data_file_address = LLDB_INVALID_ADDRESS;
|
|
|
|
}
|
|
|
|
offset = saved_offset;
|
|
|
|
}
|
|
|
|
offset += aug_data_len;
|
|
|
|
}
|
|
|
|
Address lsda_data;
|
|
|
|
Address personality_function_ptr;
|
|
|
|
|
|
|
|
if (lsda_data_file_address != LLDB_INVALID_ADDRESS &&
|
|
|
|
cie->personality_loc != LLDB_INVALID_ADDRESS) {
|
|
|
|
m_objfile.GetModule()->ResolveFileAddress(lsda_data_file_address,
|
|
|
|
lsda_data);
|
|
|
|
m_objfile.GetModule()->ResolveFileAddress(cie->personality_loc,
|
|
|
|
personality_function_ptr);
|
|
|
|
}
|
|
|
|
|
|
|
|
if (lsda_data.IsValid() && personality_function_ptr.IsValid()) {
|
|
|
|
unwind_plan.SetLSDAAddress(lsda_data);
|
|
|
|
unwind_plan.SetPersonalityFunctionPtr(personality_function_ptr);
|
|
|
|
}
|
|
|
|
|
|
|
|
uint32_t code_align = cie->code_align;
|
|
|
|
int32_t data_align = cie->data_align;
|
|
|
|
|
|
|
|
unwind_plan.SetPlanValidAddressRange(range);
|
|
|
|
UnwindPlan::Row *cie_initial_row = new UnwindPlan::Row;
|
|
|
|
*cie_initial_row = cie->initial_row;
|
|
|
|
UnwindPlan::RowSP row(cie_initial_row);
|
|
|
|
|
|
|
|
unwind_plan.SetRegisterKind(m_reg_kind);
|
|
|
|
unwind_plan.SetReturnAddressRegister(cie->return_addr_reg_num);
|
|
|
|
|
|
|
|
std::vector<UnwindPlan::RowSP> stack;
|
|
|
|
|
|
|
|
UnwindPlan::Row::RegisterLocation reg_location;
|
|
|
|
while (m_cfi_data.ValidOffset(offset) && offset < end_offset) {
|
|
|
|
uint8_t inst = m_cfi_data.GetU8(&offset);
|
|
|
|
uint8_t primary_opcode = inst & 0xC0;
|
|
|
|
uint8_t extended_opcode = inst & 0x3F;
|
|
|
|
|
|
|
|
if (!HandleCommonDwarfOpcode(primary_opcode, extended_opcode, data_align,
|
|
|
|
offset, *row)) {
|
|
|
|
if (primary_opcode) {
|
|
|
|
switch (primary_opcode) {
|
|
|
|
case DW_CFA_advance_loc: // (Row Creation Instruction)
|
|
|
|
{ // 0x40 - high 2 bits are 0x1, lower 6 bits are delta
|
|
|
|
// takes a single argument that represents a constant delta. The
|
|
|
|
// required action is to create a new table row with a location
|
|
|
|
// value that is computed by taking the current entry's location
|
|
|
|
// value and adding (delta * code_align). All other
|
|
|
|
// values in the new row are initially identical to the current row.
|
|
|
|
unwind_plan.AppendRow(row);
|
|
|
|
UnwindPlan::Row *newrow = new UnwindPlan::Row;
|
|
|
|
*newrow = *row.get();
|
|
|
|
row.reset(newrow);
|
|
|
|
row->SlideOffset(extended_opcode * code_align);
|
|
|
|
break;
|
2014-08-26 05:39:30 +08:00
|
|
|
}
|
2010-06-09 00:52:24 +08:00
|
|
|
|
2016-09-07 04:57:50 +08:00
|
|
|
case DW_CFA_restore: { // 0xC0 - high 2 bits are 0x3, lower 6 bits are
|
|
|
|
// register
|
|
|
|
// takes a single argument that represents a register number. The
|
|
|
|
// required action is to change the rule for the indicated register
|
|
|
|
// to the rule assigned it by the initial_instructions in the CIE.
|
|
|
|
uint32_t reg_num = extended_opcode;
|
|
|
|
// We only keep enough register locations around to
|
|
|
|
// unwind what is in our thread, and these are organized
|
|
|
|
// by the register index in that state, so we need to convert our
|
|
|
|
// eh_frame register number from the EH frame info, to a register
|
|
|
|
// index
|
|
|
|
|
|
|
|
if (unwind_plan.IsValidRowIndex(0) &&
|
|
|
|
unwind_plan.GetRowAtIndex(0)->GetRegisterInfo(reg_num,
|
|
|
|
reg_location))
|
|
|
|
row->SetRegisterInfo(reg_num, reg_location);
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
} else {
|
|
|
|
switch (extended_opcode) {
|
|
|
|
case DW_CFA_set_loc: // 0x1 (Row Creation Instruction)
|
2015-04-02 12:35:32 +08:00
|
|
|
{
|
2016-09-07 04:57:50 +08:00
|
|
|
// DW_CFA_set_loc takes a single argument that represents an address.
|
|
|
|
// The required action is to create a new table row using the
|
|
|
|
// specified address as the location. All other values in the new row
|
|
|
|
// are initially identical to the current row. The new location value
|
|
|
|
// should always be greater than the current one.
|
|
|
|
unwind_plan.AppendRow(row);
|
|
|
|
UnwindPlan::Row *newrow = new UnwindPlan::Row;
|
|
|
|
*newrow = *row.get();
|
|
|
|
row.reset(newrow);
|
|
|
|
row->SetOffset(m_cfi_data.GetPointer(&offset) -
|
|
|
|
startaddr.GetFileAddress());
|
|
|
|
break;
|
2015-04-02 12:35:32 +08:00
|
|
|
}
|
2016-09-07 04:57:50 +08:00
|
|
|
|
|
|
|
case DW_CFA_advance_loc1: // 0x2 (Row Creation Instruction)
|
2015-04-02 12:35:32 +08:00
|
|
|
{
|
2016-09-07 04:57:50 +08:00
|
|
|
// takes a single uword argument that represents a constant delta.
|
|
|
|
// This instruction is identical to DW_CFA_advance_loc except for the
|
|
|
|
// encoding and size of the delta argument.
|
|
|
|
unwind_plan.AppendRow(row);
|
|
|
|
UnwindPlan::Row *newrow = new UnwindPlan::Row;
|
|
|
|
*newrow = *row.get();
|
|
|
|
row.reset(newrow);
|
|
|
|
row->SlideOffset(m_cfi_data.GetU8(&offset) * code_align);
|
|
|
|
break;
|
2015-04-02 12:35:32 +08:00
|
|
|
}
|
|
|
|
|
2016-09-07 04:57:50 +08:00
|
|
|
case DW_CFA_advance_loc2: // 0x3 (Row Creation Instruction)
|
2010-09-10 15:49:16 +08:00
|
|
|
{
|
2016-09-07 04:57:50 +08:00
|
|
|
// takes a single uword argument that represents a constant delta.
|
|
|
|
// This instruction is identical to DW_CFA_advance_loc except for the
|
|
|
|
// encoding and size of the delta argument.
|
|
|
|
unwind_plan.AppendRow(row);
|
|
|
|
UnwindPlan::Row *newrow = new UnwindPlan::Row;
|
|
|
|
*newrow = *row.get();
|
|
|
|
row.reset(newrow);
|
|
|
|
row->SlideOffset(m_cfi_data.GetU16(&offset) * code_align);
|
|
|
|
break;
|
2010-09-10 15:49:16 +08:00
|
|
|
}
|
|
|
|
|
2016-09-07 04:57:50 +08:00
|
|
|
case DW_CFA_advance_loc4: // 0x4 (Row Creation Instruction)
|
2011-06-17 09:22:15 +08:00
|
|
|
{
|
2016-09-07 04:57:50 +08:00
|
|
|
// takes a single uword argument that represents a constant delta.
|
|
|
|
// This instruction is identical to DW_CFA_advance_loc except for the
|
|
|
|
// encoding and size of the delta argument.
|
|
|
|
unwind_plan.AppendRow(row);
|
|
|
|
UnwindPlan::Row *newrow = new UnwindPlan::Row;
|
|
|
|
*newrow = *row.get();
|
|
|
|
row.reset(newrow);
|
|
|
|
row->SlideOffset(m_cfi_data.GetU32(&offset) * code_align);
|
|
|
|
break;
|
|
|
|
}
|
2011-06-17 09:22:15 +08:00
|
|
|
|
2016-09-07 04:57:50 +08:00
|
|
|
case DW_CFA_restore_extended: // 0x6
|
|
|
|
{
|
|
|
|
// takes a single unsigned LEB128 argument that represents a register
|
|
|
|
// number. This instruction is identical to DW_CFA_restore except for
|
|
|
|
// the encoding and size of the register argument.
|
|
|
|
uint32_t reg_num = (uint32_t)m_cfi_data.GetULEB128(&offset);
|
|
|
|
if (unwind_plan.IsValidRowIndex(0) &&
|
|
|
|
unwind_plan.GetRowAtIndex(0)->GetRegisterInfo(reg_num,
|
|
|
|
reg_location))
|
|
|
|
row->SetRegisterInfo(reg_num, reg_location);
|
|
|
|
break;
|
|
|
|
}
|
2016-06-07 10:19:54 +08:00
|
|
|
|
2016-09-07 04:57:50 +08:00
|
|
|
case DW_CFA_remember_state: // 0xA
|
|
|
|
{
|
|
|
|
// These instructions define a stack of information. Encountering the
|
|
|
|
// DW_CFA_remember_state instruction means to save the rules for every
|
|
|
|
// register on the current row on the stack. Encountering the
|
|
|
|
// DW_CFA_restore_state instruction means to pop the set of rules off
|
|
|
|
// the stack and place them in the current row. (This operation is
|
|
|
|
// useful for compilers that move epilogue code into the body of a
|
|
|
|
// function.)
|
|
|
|
stack.push_back(row);
|
|
|
|
UnwindPlan::Row *newrow = new UnwindPlan::Row;
|
|
|
|
*newrow = *row.get();
|
|
|
|
row.reset(newrow);
|
|
|
|
break;
|
2011-06-17 09:22:15 +08:00
|
|
|
}
|
2016-09-07 04:57:50 +08:00
|
|
|
|
|
|
|
case DW_CFA_restore_state: // 0xB
|
2011-06-17 09:22:15 +08:00
|
|
|
{
|
2016-09-07 04:57:50 +08:00
|
|
|
// These instructions define a stack of information. Encountering the
|
|
|
|
// DW_CFA_remember_state instruction means to save the rules for every
|
|
|
|
// register on the current row on the stack. Encountering the
|
|
|
|
// DW_CFA_restore_state instruction means to pop the set of rules off
|
|
|
|
// the stack and place them in the current row. (This operation is
|
|
|
|
// useful for compilers that move epilogue code into the body of a
|
|
|
|
// function.)
|
|
|
|
if (stack.empty()) {
|
|
|
|
if (log)
|
|
|
|
log->Printf("DWARFCallFrameInfo::%s(dwarf_offset: %" PRIx32
|
|
|
|
", startaddr: %" PRIx64
|
|
|
|
" encountered DW_CFA_restore_state but state stack "
|
|
|
|
"is empty. Corrupt unwind info?",
|
|
|
|
__FUNCTION__, dwarf_offset,
|
|
|
|
startaddr.GetFileAddress());
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
lldb::addr_t offset = row->GetOffset();
|
|
|
|
row = stack.back();
|
|
|
|
stack.pop_back();
|
|
|
|
row->SetOffset(offset);
|
|
|
|
break;
|
2011-06-17 09:22:15 +08:00
|
|
|
}
|
2010-06-09 00:52:24 +08:00
|
|
|
|
2016-09-07 04:57:50 +08:00
|
|
|
case DW_CFA_GNU_args_size: // 0x2e
|
|
|
|
{
|
|
|
|
// The DW_CFA_GNU_args_size instruction takes an unsigned LEB128
|
|
|
|
// operand
|
|
|
|
// representing an argument size. This instruction specifies the total
|
|
|
|
// of
|
|
|
|
// the size of the arguments which have been pushed onto the stack.
|
|
|
|
|
|
|
|
// TODO: Figure out how we should handle this.
|
|
|
|
m_cfi_data.GetULEB128(&offset);
|
|
|
|
break;
|
|
|
|
}
|
2010-06-09 00:52:24 +08:00
|
|
|
|
2016-09-07 04:57:50 +08:00
|
|
|
case DW_CFA_val_offset: // 0x14
|
|
|
|
case DW_CFA_val_offset_sf: // 0x15
|
|
|
|
default:
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
unwind_plan.AppendRow(row);
|
2010-06-09 00:52:24 +08:00
|
|
|
|
2016-09-07 04:57:50 +08:00
|
|
|
return true;
|
|
|
|
}
|
2010-06-09 00:52:24 +08:00
|
|
|
|
2016-09-07 04:57:50 +08:00
|
|
|
bool DWARFCallFrameInfo::HandleCommonDwarfOpcode(uint8_t primary_opcode,
|
|
|
|
uint8_t extended_opcode,
|
|
|
|
int32_t data_align,
|
|
|
|
lldb::offset_t &offset,
|
|
|
|
UnwindPlan::Row &row) {
|
|
|
|
UnwindPlan::Row::RegisterLocation reg_location;
|
|
|
|
|
|
|
|
if (primary_opcode) {
|
|
|
|
switch (primary_opcode) {
|
|
|
|
case DW_CFA_offset: { // 0x80 - high 2 bits are 0x2, lower 6 bits are
|
|
|
|
// register
|
|
|
|
// takes two arguments: an unsigned LEB128 constant representing a
|
|
|
|
// factored offset and a register number. The required action is to
|
|
|
|
// change the rule for the register indicated by the register number
|
|
|
|
// to be an offset(N) rule with a value of
|
|
|
|
// (N = factored offset * data_align).
|
|
|
|
uint8_t reg_num = extended_opcode;
|
|
|
|
int32_t op_offset = (int32_t)m_cfi_data.GetULEB128(&offset) * data_align;
|
|
|
|
reg_location.SetAtCFAPlusOffset(op_offset);
|
|
|
|
row.SetRegisterInfo(reg_num, reg_location);
|
|
|
|
return true;
|
2014-08-26 05:39:30 +08:00
|
|
|
}
|
2016-09-07 04:57:50 +08:00
|
|
|
}
|
|
|
|
} else {
|
|
|
|
switch (extended_opcode) {
|
|
|
|
case DW_CFA_nop: // 0x0
|
|
|
|
return true;
|
2010-06-09 00:52:24 +08:00
|
|
|
|
2016-09-07 04:57:50 +08:00
|
|
|
case DW_CFA_offset_extended: // 0x5
|
2010-10-25 19:12:07 +08:00
|
|
|
{
|
2016-09-07 04:57:50 +08:00
|
|
|
// takes two unsigned LEB128 arguments representing a register number
|
|
|
|
// and a factored offset. This instruction is identical to DW_CFA_offset
|
|
|
|
// except for the encoding and size of the register argument.
|
|
|
|
uint32_t reg_num = (uint32_t)m_cfi_data.GetULEB128(&offset);
|
|
|
|
int32_t op_offset = (int32_t)m_cfi_data.GetULEB128(&offset) * data_align;
|
|
|
|
UnwindPlan::Row::RegisterLocation reg_location;
|
|
|
|
reg_location.SetAtCFAPlusOffset(op_offset);
|
|
|
|
row.SetRegisterInfo(reg_num, reg_location);
|
|
|
|
return true;
|
2010-10-25 19:12:07 +08:00
|
|
|
}
|
2016-09-07 04:57:50 +08:00
|
|
|
|
|
|
|
case DW_CFA_undefined: // 0x7
|
2010-10-25 19:12:07 +08:00
|
|
|
{
|
2016-09-07 04:57:50 +08:00
|
|
|
// takes a single unsigned LEB128 argument that represents a register
|
|
|
|
// number. The required action is to set the rule for the specified
|
|
|
|
// register to undefined.
|
|
|
|
uint32_t reg_num = (uint32_t)m_cfi_data.GetULEB128(&offset);
|
|
|
|
UnwindPlan::Row::RegisterLocation reg_location;
|
|
|
|
reg_location.SetUndefined();
|
|
|
|
row.SetRegisterInfo(reg_num, reg_location);
|
|
|
|
return true;
|
2010-10-25 19:12:07 +08:00
|
|
|
}
|
2010-06-09 00:52:24 +08:00
|
|
|
|
2016-09-07 04:57:50 +08:00
|
|
|
case DW_CFA_same_value: // 0x8
|
2010-09-10 15:49:16 +08:00
|
|
|
{
|
2016-09-07 04:57:50 +08:00
|
|
|
// takes a single unsigned LEB128 argument that represents a register
|
|
|
|
// number. The required action is to set the rule for the specified
|
|
|
|
// register to same value.
|
|
|
|
uint32_t reg_num = (uint32_t)m_cfi_data.GetULEB128(&offset);
|
|
|
|
UnwindPlan::Row::RegisterLocation reg_location;
|
|
|
|
reg_location.SetSame();
|
|
|
|
row.SetRegisterInfo(reg_num, reg_location);
|
|
|
|
return true;
|
2010-06-09 00:52:24 +08:00
|
|
|
}
|
2014-11-18 10:27:42 +08:00
|
|
|
|
2016-09-07 04:57:50 +08:00
|
|
|
case DW_CFA_register: // 0x9
|
2014-11-18 10:27:42 +08:00
|
|
|
{
|
2016-09-07 04:57:50 +08:00
|
|
|
// takes two unsigned LEB128 arguments representing register numbers.
|
|
|
|
// The required action is to set the rule for the first register to be
|
|
|
|
// the second register.
|
|
|
|
uint32_t reg_num = (uint32_t)m_cfi_data.GetULEB128(&offset);
|
|
|
|
uint32_t other_reg_num = (uint32_t)m_cfi_data.GetULEB128(&offset);
|
|
|
|
UnwindPlan::Row::RegisterLocation reg_location;
|
|
|
|
reg_location.SetInRegister(other_reg_num);
|
|
|
|
row.SetRegisterInfo(reg_num, reg_location);
|
|
|
|
return true;
|
2014-11-18 10:27:42 +08:00
|
|
|
}
|
|
|
|
|
2016-09-07 04:57:50 +08:00
|
|
|
case DW_CFA_def_cfa: // 0xC (CFA Definition Instruction)
|
2014-11-18 10:27:42 +08:00
|
|
|
{
|
2016-09-07 04:57:50 +08:00
|
|
|
// Takes two unsigned LEB128 operands representing a register
|
|
|
|
// number and a (non-factored) offset. The required action
|
|
|
|
// is to define the current CFA rule to use the provided
|
|
|
|
// register and offset.
|
|
|
|
uint32_t reg_num = (uint32_t)m_cfi_data.GetULEB128(&offset);
|
|
|
|
int32_t op_offset = (int32_t)m_cfi_data.GetULEB128(&offset);
|
|
|
|
row.GetCFAValue().SetIsRegisterPlusOffset(reg_num, op_offset);
|
|
|
|
return true;
|
2014-11-18 10:27:42 +08:00
|
|
|
}
|
2010-06-09 00:52:24 +08:00
|
|
|
|
2016-09-07 04:57:50 +08:00
|
|
|
case DW_CFA_def_cfa_register: // 0xD (CFA Definition Instruction)
|
2010-06-09 00:52:24 +08:00
|
|
|
{
|
2016-09-07 04:57:50 +08:00
|
|
|
// takes a single unsigned LEB128 argument representing a register
|
|
|
|
// number. The required action is to define the current CFA rule to
|
|
|
|
// use the provided register (but to keep the old offset).
|
|
|
|
uint32_t reg_num = (uint32_t)m_cfi_data.GetULEB128(&offset);
|
|
|
|
row.GetCFAValue().SetIsRegisterPlusOffset(reg_num,
|
|
|
|
row.GetCFAValue().GetOffset());
|
|
|
|
return true;
|
2015-07-03 17:30:17 +08:00
|
|
|
}
|
2010-06-09 00:52:24 +08:00
|
|
|
|
2016-09-07 04:57:50 +08:00
|
|
|
case DW_CFA_def_cfa_offset: // 0xE (CFA Definition Instruction)
|
2015-07-03 17:30:17 +08:00
|
|
|
{
|
2016-09-07 04:57:50 +08:00
|
|
|
// Takes a single unsigned LEB128 operand representing a
|
|
|
|
// (non-factored) offset. The required action is to define
|
|
|
|
// the current CFA rule to use the provided offset (but
|
|
|
|
// to keep the old register).
|
|
|
|
int32_t op_offset = (int32_t)m_cfi_data.GetULEB128(&offset);
|
|
|
|
row.GetCFAValue().SetIsRegisterPlusOffset(
|
|
|
|
row.GetCFAValue().GetRegisterNumber(), op_offset);
|
|
|
|
return true;
|
2015-07-03 17:30:17 +08:00
|
|
|
}
|
|
|
|
|
2016-09-07 04:57:50 +08:00
|
|
|
case DW_CFA_def_cfa_expression: // 0xF (CFA Definition Instruction)
|
|
|
|
{
|
|
|
|
size_t block_len = (size_t)m_cfi_data.GetULEB128(&offset);
|
|
|
|
const uint8_t *block_data =
|
|
|
|
static_cast<const uint8_t *>(m_cfi_data.GetData(&offset, block_len));
|
|
|
|
row.GetCFAValue().SetIsDWARFExpression(block_data, block_len);
|
|
|
|
return true;
|
|
|
|
}
|
2015-07-03 17:30:17 +08:00
|
|
|
|
2016-09-07 04:57:50 +08:00
|
|
|
case DW_CFA_expression: // 0x10
|
|
|
|
{
|
|
|
|
// Takes two operands: an unsigned LEB128 value representing
|
|
|
|
// a register number, and a DW_FORM_block value representing a DWARF
|
|
|
|
// expression. The required action is to change the rule for the
|
|
|
|
// register indicated by the register number to be an expression(E)
|
|
|
|
// rule where E is the DWARF expression. That is, the DWARF
|
|
|
|
// expression computes the address. The value of the CFA is
|
|
|
|
// pushed on the DWARF evaluation stack prior to execution of
|
|
|
|
// the DWARF expression.
|
|
|
|
uint32_t reg_num = (uint32_t)m_cfi_data.GetULEB128(&offset);
|
|
|
|
uint32_t block_len = (uint32_t)m_cfi_data.GetULEB128(&offset);
|
|
|
|
const uint8_t *block_data =
|
|
|
|
static_cast<const uint8_t *>(m_cfi_data.GetData(&offset, block_len));
|
|
|
|
UnwindPlan::Row::RegisterLocation reg_location;
|
|
|
|
reg_location.SetAtDWARFExpression(block_data, block_len);
|
|
|
|
row.SetRegisterInfo(reg_num, reg_location);
|
|
|
|
return true;
|
|
|
|
}
|
2015-07-03 17:30:17 +08:00
|
|
|
|
2016-09-07 04:57:50 +08:00
|
|
|
case DW_CFA_offset_extended_sf: // 0x11
|
|
|
|
{
|
|
|
|
// takes two operands: an unsigned LEB128 value representing a
|
|
|
|
// register number and a signed LEB128 factored offset. This
|
|
|
|
// instruction is identical to DW_CFA_offset_extended except
|
|
|
|
// that the second operand is signed and factored.
|
|
|
|
uint32_t reg_num = (uint32_t)m_cfi_data.GetULEB128(&offset);
|
|
|
|
int32_t op_offset = (int32_t)m_cfi_data.GetSLEB128(&offset) * data_align;
|
|
|
|
UnwindPlan::Row::RegisterLocation reg_location;
|
|
|
|
reg_location.SetAtCFAPlusOffset(op_offset);
|
|
|
|
row.SetRegisterInfo(reg_num, reg_location);
|
|
|
|
return true;
|
|
|
|
}
|
2015-07-03 17:30:17 +08:00
|
|
|
|
2016-09-07 04:57:50 +08:00
|
|
|
case DW_CFA_def_cfa_sf: // 0x12 (CFA Definition Instruction)
|
|
|
|
{
|
|
|
|
// Takes two operands: an unsigned LEB128 value representing
|
|
|
|
// a register number and a signed LEB128 factored offset.
|
|
|
|
// This instruction is identical to DW_CFA_def_cfa except
|
|
|
|
// that the second operand is signed and factored.
|
|
|
|
uint32_t reg_num = (uint32_t)m_cfi_data.GetULEB128(&offset);
|
|
|
|
int32_t op_offset = (int32_t)m_cfi_data.GetSLEB128(&offset) * data_align;
|
|
|
|
row.GetCFAValue().SetIsRegisterPlusOffset(reg_num, op_offset);
|
|
|
|
return true;
|
|
|
|
}
|
2015-07-03 17:30:17 +08:00
|
|
|
|
2016-09-07 04:57:50 +08:00
|
|
|
case DW_CFA_def_cfa_offset_sf: // 0x13 (CFA Definition Instruction)
|
|
|
|
{
|
|
|
|
// takes a signed LEB128 operand representing a factored
|
|
|
|
// offset. This instruction is identical to DW_CFA_def_cfa_offset
|
|
|
|
// except that the operand is signed and factored.
|
|
|
|
int32_t op_offset = (int32_t)m_cfi_data.GetSLEB128(&offset) * data_align;
|
|
|
|
uint32_t cfa_regnum = row.GetCFAValue().GetRegisterNumber();
|
|
|
|
row.GetCFAValue().SetIsRegisterPlusOffset(cfa_regnum, op_offset);
|
|
|
|
return true;
|
|
|
|
}
|
2015-07-03 17:30:17 +08:00
|
|
|
|
2016-09-07 04:57:50 +08:00
|
|
|
case DW_CFA_val_expression: // 0x16
|
|
|
|
{
|
|
|
|
// takes two operands: an unsigned LEB128 value representing a register
|
|
|
|
// number, and a DW_FORM_block value representing a DWARF expression.
|
|
|
|
// The required action is to change the rule for the register indicated
|
|
|
|
// by the register number to be a val_expression(E) rule where E is the
|
|
|
|
// DWARF expression. That is, the DWARF expression computes the value of
|
|
|
|
// the given register. The value of the CFA is pushed on the DWARF
|
|
|
|
// evaluation stack prior to execution of the DWARF expression.
|
|
|
|
uint32_t reg_num = (uint32_t)m_cfi_data.GetULEB128(&offset);
|
|
|
|
uint32_t block_len = (uint32_t)m_cfi_data.GetULEB128(&offset);
|
|
|
|
const uint8_t *block_data =
|
|
|
|
(const uint8_t *)m_cfi_data.GetData(&offset, block_len);
|
|
|
|
//#if defined(__i386__) || defined(__x86_64__)
|
|
|
|
// // The EH frame info for EIP and RIP contains code that
|
|
|
|
// looks for traps to
|
|
|
|
// // be a specific type and increments the PC.
|
|
|
|
// // For i386:
|
|
|
|
// // DW_CFA_val_expression where:
|
|
|
|
// // eip = DW_OP_breg6(+28), DW_OP_deref, DW_OP_dup,
|
|
|
|
// DW_OP_plus_uconst(0x34),
|
|
|
|
// // DW_OP_deref, DW_OP_swap, DW_OP_plus_uconst(0),
|
|
|
|
// DW_OP_deref,
|
|
|
|
// // DW_OP_dup, DW_OP_lit3, DW_OP_ne, DW_OP_swap,
|
|
|
|
// DW_OP_lit4, DW_OP_ne,
|
|
|
|
// // DW_OP_and, DW_OP_plus
|
|
|
|
// // This basically does a:
|
|
|
|
// // eip = ucontenxt.mcontext32->gpr.eip;
|
|
|
|
// // if (ucontenxt.mcontext32->exc.trapno != 3 &&
|
|
|
|
// ucontenxt.mcontext32->exc.trapno != 4)
|
|
|
|
// // eip++;
|
|
|
|
// //
|
|
|
|
// // For x86_64:
|
|
|
|
// // DW_CFA_val_expression where:
|
|
|
|
// // rip = DW_OP_breg3(+48), DW_OP_deref, DW_OP_dup,
|
|
|
|
// DW_OP_plus_uconst(0x90), DW_OP_deref,
|
|
|
|
// // DW_OP_swap, DW_OP_plus_uconst(0),
|
|
|
|
// DW_OP_deref_size(4), DW_OP_dup, DW_OP_lit3,
|
|
|
|
// // DW_OP_ne, DW_OP_swap, DW_OP_lit4, DW_OP_ne,
|
|
|
|
// DW_OP_and, DW_OP_plus
|
|
|
|
// // This basically does a:
|
|
|
|
// // rip = ucontenxt.mcontext64->gpr.rip;
|
|
|
|
// // if (ucontenxt.mcontext64->exc.trapno != 3 &&
|
|
|
|
// ucontenxt.mcontext64->exc.trapno != 4)
|
|
|
|
// // rip++;
|
|
|
|
// // The trap comparisons and increments are not needed as
|
|
|
|
// it hoses up the unwound PC which
|
|
|
|
// // is expected to point at least past the instruction that
|
|
|
|
// causes the fault/trap. So we
|
|
|
|
// // take it out by trimming the expression right at the
|
|
|
|
// first "DW_OP_swap" opcodes
|
|
|
|
// if (block_data != NULL && thread->GetPCRegNum(Thread::GCC)
|
|
|
|
// == reg_num)
|
|
|
|
// {
|
|
|
|
// if (thread->Is64Bit())
|
|
|
|
// {
|
|
|
|
// if (block_len > 9 && block_data[8] == DW_OP_swap
|
|
|
|
// && block_data[9] == DW_OP_plus_uconst)
|
|
|
|
// block_len = 8;
|
|
|
|
// }
|
|
|
|
// else
|
|
|
|
// {
|
|
|
|
// if (block_len > 8 && block_data[7] == DW_OP_swap
|
|
|
|
// && block_data[8] == DW_OP_plus_uconst)
|
|
|
|
// block_len = 7;
|
|
|
|
// }
|
|
|
|
// }
|
|
|
|
//#endif
|
|
|
|
reg_location.SetIsDWARFExpression(block_data, block_len);
|
|
|
|
row.SetRegisterInfo(reg_num, reg_location);
|
|
|
|
return true;
|
2010-06-09 00:52:24 +08:00
|
|
|
}
|
2016-09-07 04:57:50 +08:00
|
|
|
}
|
|
|
|
}
|
|
|
|
return false;
|
2010-06-09 00:52:24 +08:00
|
|
|
}
|
2016-02-18 19:12:18 +08:00
|
|
|
|
2016-09-07 04:57:50 +08:00
|
|
|
void DWARFCallFrameInfo::ForEachFDEEntries(
|
|
|
|
const std::function<bool(lldb::addr_t, uint32_t, dw_offset_t)> &callback) {
|
|
|
|
GetFDEIndex();
|
2016-02-18 19:12:18 +08:00
|
|
|
|
2016-09-07 04:57:50 +08:00
|
|
|
for (size_t i = 0, c = m_fde_index.GetSize(); i < c; ++i) {
|
|
|
|
const FDEEntryMap::Entry &entry = m_fde_index.GetEntryRef(i);
|
|
|
|
if (!callback(entry.base, entry.size, entry.data))
|
|
|
|
break;
|
|
|
|
}
|
2016-02-18 19:12:18 +08:00
|
|
|
}
|