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Add support for using armv7 compact unwind information

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as an asynchronous unwind plan source.

Two small fixes to the compact unwind dumper tool for
armv7 encodings.

A change to DWARFCallFrameInfo to strip the 0th bit on
addresses in eh_frame sections when armv7.  In the 
clang generated examples I have, the 0th bit is set for
thumb functions and that's causing the unwinder to pick
the wrong function for eh_frame info.

llvm-svn: 271970
This commit is contained in:
Jason Molenda 2016-06-07 02:19:54 +00:00
parent 6fd589a763
commit c7afda5a09
4 changed files with 322 additions and 54 deletions
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3
lldb/include/lldb/Symbol/CompactUnwindInfo.h
View File

@ -136,6 +136,9 @@ private:
bool bool
CreateUnwindPlan_arm64 (Target &target, FunctionInfo &function_info, UnwindPlan &unwind_plan, Address pc_or_function_start); CreateUnwindPlan_arm64 (Target &target, FunctionInfo &function_info, UnwindPlan &unwind_plan, Address pc_or_function_start);
bool
CreateUnwindPlan_armv7 (Target &target, FunctionInfo &function_info, UnwindPlan &unwind_plan, Address pc_or_function_start);
ObjectFile &m_objfile; ObjectFile &m_objfile;
lldb::SectionSP m_section_sp; lldb::SectionSP m_section_sp;
lldb::DataBufferSP m_section_contents_if_encrypted; // if the binary is encrypted, read the sect contents lldb::DataBufferSP m_section_contents_if_encrypted; // if the binary is encrypted, read the sect contents

358
lldb/source/Symbol/CompactUnwindInfo.cpp
View File

@ -104,24 +104,49 @@ namespace lldb_private {
FLAGS_ANONYMOUS_ENUM() FLAGS_ANONYMOUS_ENUM()
{ {
UNWIND_ARM64_MODE_MASK = 0x0F000000, UNWIND_ARM64_MODE_MASK = 0x0F000000,
UNWIND_ARM64_MODE_FRAMELESS = 0x02000000, UNWIND_ARM64_MODE_FRAMELESS = 0x02000000,
UNWIND_ARM64_MODE_DWARF = 0x03000000, UNWIND_ARM64_MODE_DWARF = 0x03000000,
UNWIND_ARM64_MODE_FRAME = 0x04000000, UNWIND_ARM64_MODE_FRAME = 0x04000000,
UNWIND_ARM64_FRAME_X19_X20_PAIR = 0x00000001, UNWIND_ARM64_FRAME_X19_X20_PAIR = 0x00000001,
UNWIND_ARM64_FRAME_X21_X22_PAIR = 0x00000002, UNWIND_ARM64_FRAME_X21_X22_PAIR = 0x00000002,
UNWIND_ARM64_FRAME_X23_X24_PAIR = 0x00000004, UNWIND_ARM64_FRAME_X23_X24_PAIR = 0x00000004,
UNWIND_ARM64_FRAME_X25_X26_PAIR = 0x00000008, UNWIND_ARM64_FRAME_X25_X26_PAIR = 0x00000008,
UNWIND_ARM64_FRAME_X27_X28_PAIR = 0x00000010, UNWIND_ARM64_FRAME_X27_X28_PAIR = 0x00000010,
UNWIND_ARM64_FRAME_D8_D9_PAIR = 0x00000100, UNWIND_ARM64_FRAME_D8_D9_PAIR = 0x00000100,
UNWIND_ARM64_FRAME_D10_D11_PAIR = 0x00000200, UNWIND_ARM64_FRAME_D10_D11_PAIR = 0x00000200,
UNWIND_ARM64_FRAME_D12_D13_PAIR = 0x00000400, UNWIND_ARM64_FRAME_D12_D13_PAIR = 0x00000400,
UNWIND_ARM64_FRAME_D14_D15_PAIR = 0x00000800, UNWIND_ARM64_FRAME_D14_D15_PAIR = 0x00000800,
UNWIND_ARM64_FRAMELESS_STACK_SIZE_MASK = 0x00FFF000, UNWIND_ARM64_FRAMELESS_STACK_SIZE_MASK = 0x00FFF000,
UNWIND_ARM64_DWARF_SECTION_OFFSET = 0x00FFFFFF, 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,
};
} }
@ -148,7 +173,7 @@ namespace lldb_private {
//---------------------- //----------------------
// constructor // constructor
//---------------------- //----------------------
CompactUnwindInfo::CompactUnwindInfo(ObjectFile &objfile, SectionSP &section_sp) CompactUnwindInfo::CompactUnwindInfo(ObjectFile &objfile, SectionSP &section_sp)
@ -194,7 +219,7 @@ CompactUnwindInfo::GetUnwindPlan (Target &target, Address addr, UnwindPlan& unwi
if (log && log->GetVerbose()) if (log && log->GetVerbose())
{ {
StreamString strm; StreamString strm;
addr.Dump (&strm, NULL, Address::DumpStyle::DumpStyleResolvedDescriptionNoFunctionArguments, Address::DumpStyle::DumpStyleFileAddress, arch.GetAddressByteSize()); addr.Dump (&strm, NULL, Address::DumpStyle::DumpStyleResolvedDescriptionNoFunctionArguments, Address::DumpStyle::DumpStyleFileAddress, arch.GetAddressByteSize());
log->Printf ("Got compact unwind encoding 0x%x for function %s", function_info.encoding, strm.GetData()); log->Printf ("Got compact unwind encoding 0x%x for function %s", function_info.encoding, strm.GetData());
} }
@ -203,7 +228,7 @@ CompactUnwindInfo::GetUnwindPlan (Target &target, Address addr, UnwindPlan& unwi
SectionList *sl = m_objfile.GetSectionList (); SectionList *sl = m_objfile.GetSectionList ();
if (sl) if (sl)
{ {
addr_t func_range_start_file_addr = addr_t func_range_start_file_addr =
function_info.valid_range_offset_start + m_objfile.GetHeaderAddress().GetFileAddress(); function_info.valid_range_offset_start + m_objfile.GetHeaderAddress().GetFileAddress();
AddressRange func_range (func_range_start_file_addr, AddressRange func_range (func_range_start_file_addr,
function_info.valid_range_offset_end - function_info.valid_range_offset_start, function_info.valid_range_offset_end - function_info.valid_range_offset_start,
@ -224,6 +249,10 @@ CompactUnwindInfo::GetUnwindPlan (Target &target, Address addr, UnwindPlan& unwi
{ {
return CreateUnwindPlan_i386 (target, function_info, unwind_plan, addr); 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; return false;
@ -271,8 +300,8 @@ CompactUnwindInfo::ScanIndex (const ProcessSP &process_sp)
m_section_contents_if_encrypted.reset (new DataBufferHeap (m_section_sp->GetByteSize(), 0)); m_section_contents_if_encrypted.reset (new DataBufferHeap (m_section_sp->GetByteSize(), 0));
Error error; Error error;
if (process_sp->ReadMemory ( if (process_sp->ReadMemory (
m_section_sp->GetLoadBaseAddress (&process_sp->GetTarget()), m_section_sp->GetLoadBaseAddress (&process_sp->GetTarget()),
m_section_contents_if_encrypted->GetBytes(), m_section_contents_if_encrypted->GetBytes(),
m_section_sp->GetByteSize(), error) == m_section_sp->GetByteSize() && error.Success()) m_section_sp->GetByteSize(), error) == m_section_sp->GetByteSize() && error.Success())
{ {
m_unwindinfo_data.SetAddressByteSize (process_sp->GetTarget().GetArchitecture().GetAddressByteSize()); m_unwindinfo_data.SetAddressByteSize (process_sp->GetTarget().GetArchitecture().GetAddressByteSize());
@ -302,7 +331,7 @@ CompactUnwindInfo::ScanIndex (const ProcessSP &process_sp)
// uint32_t personalityArrayCount; // uint32_t personalityArrayCount;
// uint32_t indexSectionOffset; // uint32_t indexSectionOffset;
// uint32_t indexCount; // uint32_t indexCount;
m_unwind_header.version = m_unwindinfo_data.GetU32(&offset); 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_offset = m_unwindinfo_data.GetU32(&offset);
m_unwind_header.common_encodings_array_count = m_unwindinfo_data.GetU32(&offset); m_unwind_header.common_encodings_array_count = m_unwindinfo_data.GetU32(&offset);
@ -328,13 +357,21 @@ CompactUnwindInfo::ScanIndex (const ProcessSP &process_sp)
// Parse the basic information from the indexes // Parse the basic information from the indexes
// We wait to scan the second level page info until it's needed // We wait to scan the second level page info until it's needed
// struct unwind_info_section_header_index_entry // struct unwind_info_section_header_index_entry
// { // {
// uint32_t functionOffset; // uint32_t functionOffset;
// uint32_t secondLevelPagesSectionOffset; // uint32_t secondLevelPagesSectionOffset;
// uint32_t lsdaIndexArraySectionOffset; // uint32_t lsdaIndexArraySectionOffset;
// }; // };
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;
}
offset = indexSectionOffset; offset = indexSectionOffset;
for (uint32_t idx = 0; idx < indexCount; idx++) for (uint32_t idx = 0; idx < indexCount; idx++)
{ {
@ -347,8 +384,11 @@ CompactUnwindInfo::ScanIndex (const ProcessSP &process_sp)
m_indexes_computed = eLazyBoolNo; m_indexes_computed = eLazyBoolNo;
} }
if (clear_address_zeroth_bit)
function_offset &= ~1ull;
UnwindIndex this_index; UnwindIndex this_index;
this_index.function_offset = function_offset; // this_index.function_offset = function_offset;
this_index.second_level = second_level_offset; this_index.second_level = second_level_offset;
this_index.lsda_array_start = lsda_offset; this_index.lsda_array_start = lsda_offset;
@ -375,7 +415,7 @@ CompactUnwindInfo::ScanIndex (const ProcessSP &process_sp)
uint32_t uint32_t
CompactUnwindInfo::GetLSDAForFunctionOffset (uint32_t lsda_offset, uint32_t lsda_count, uint32_t function_offset) CompactUnwindInfo::GetLSDAForFunctionOffset (uint32_t lsda_offset, uint32_t lsda_count, uint32_t function_offset)
{ {
// struct unwind_info_section_header_lsda_index_entry // struct unwind_info_section_header_lsda_index_entry
// { // {
// uint32_t functionOffset; // uint32_t functionOffset;
// uint32_t lsdaOffset; // uint32_t lsdaOffset;
@ -410,7 +450,7 @@ 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) 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; // typedef uint32_t compact_unwind_encoding_t;
// struct unwind_info_regular_second_level_entry // struct unwind_info_regular_second_level_entry
// { // {
// uint32_t functionOffset; // uint32_t functionOffset;
// compact_unwind_encoding_t encoding; // compact_unwind_encoding_t encoding;
@ -525,10 +565,10 @@ CompactUnwindInfo::GetCompactUnwindInfoForFunction (Target &target, Address addr
return false; return false;
addr_t function_offset = address.GetFileAddress() - m_objfile.GetHeaderAddress().GetFileAddress(); addr_t function_offset = address.GetFileAddress() - m_objfile.GetHeaderAddress().GetFileAddress();
UnwindIndex key; UnwindIndex key;
key.function_offset = function_offset; key.function_offset = function_offset;
std::vector<UnwindIndex>::const_iterator it; std::vector<UnwindIndex>::const_iterator it;
it = std::lower_bound (m_indexes.begin(), m_indexes.end(), key); it = std::lower_bound (m_indexes.begin(), m_indexes.end(), key);
if (it == m_indexes.end()) if (it == m_indexes.end())
@ -550,7 +590,7 @@ CompactUnwindInfo::GetCompactUnwindInfoForFunction (Target &target, Address addr
auto next_it = it + 1; auto next_it = it + 1;
if (next_it != m_indexes.end()) if (next_it != m_indexes.end())
{ {
// initialize the function offset end range to be the start of the // 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 // next index offset. If we find an entry which is at the end of
// the index table, this will establish the range end. // the index table, this will establish the range end.
unwind_info.valid_range_offset_end = next_it->function_offset; unwind_info.valid_range_offset_end = next_it->function_offset;
@ -572,7 +612,7 @@ CompactUnwindInfo::GetCompactUnwindInfoForFunction (Target &target, Address addr
// uint16_t entryCount; // uint16_t entryCount;
// typedef uint32_t compact_unwind_encoding_t; // typedef uint32_t compact_unwind_encoding_t;
// struct unwind_info_regular_second_level_entry // struct unwind_info_regular_second_level_entry
// { // {
// uint32_t functionOffset; // uint32_t functionOffset;
// compact_unwind_encoding_t encoding; // compact_unwind_encoding_t encoding;
@ -627,9 +667,9 @@ CompactUnwindInfo::GetCompactUnwindInfoForFunction (Target &target, Address addr
// uint32_t kind; // UNWIND_SECOND_LEVEL_COMPRESSED // uint32_t kind; // UNWIND_SECOND_LEVEL_COMPRESSED
// uint16_t entryPageOffset; // offset from this 2nd lvl page idx to array of entries // 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) // // (an entry has a function offset and index into the encodings)
// // NB function offset from the entry in the compressed page // // NB function offset from the entry in the compressed page
// // must be added to the index's functionOffset value. // // must be added to the index's functionOffset value.
// uint16_t entryCount; // uint16_t entryCount;
// uint16_t encodingsPageOffset; // offset from this 2nd lvl page idx to array of encodings // uint16_t encodingsPageOffset; // offset from this 2nd lvl page idx to array of encodings
// uint16_t encodingsCount; // uint16_t encodingsCount;
@ -649,7 +689,7 @@ CompactUnwindInfo::GetCompactUnwindInfoForFunction (Target &target, Address addr
offset = m_unwind_header.common_encodings_array_offset + (encoding_index * sizeof (uint32_t)); offset = m_unwind_header.common_encodings_array_offset + (encoding_index * sizeof (uint32_t));
encoding = m_unwindinfo_data.GetU32(&offset); // encoding entry from the commonEncodingsArray encoding = m_unwindinfo_data.GetU32(&offset); // encoding entry from the commonEncodingsArray
} }
else else
{ {
uint32_t page_specific_entry_index = encoding_index - m_unwind_header.common_encodings_array_count; 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)); offset = second_page_offset + encodings_page_offset + (page_specific_entry_index * sizeof (uint32_t));
@ -765,7 +805,7 @@ CompactUnwindInfo::CreateUnwindPlan_x86_64 (Target &target, FunctionInfo &functi
row->SetRegisterLocationToAtCFAPlusOffset (x86_64_eh_regnum::rbp, wordsize * -2, true); row->SetRegisterLocationToAtCFAPlusOffset (x86_64_eh_regnum::rbp, wordsize * -2, true);
row->SetRegisterLocationToAtCFAPlusOffset (x86_64_eh_regnum::rip, wordsize * -1, true); row->SetRegisterLocationToAtCFAPlusOffset (x86_64_eh_regnum::rip, wordsize * -1, true);
row->SetRegisterLocationToIsCFAPlusOffset (x86_64_eh_regnum::rsp, 0, 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_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); uint32_t saved_registers_locations = EXTRACT_BITS (function_info.encoding, UNWIND_X86_64_RBP_FRAME_REGISTERS);
@ -798,7 +838,7 @@ CompactUnwindInfo::CreateUnwindPlan_x86_64 (Target &target, FunctionInfo &functi
case UNWIND_X86_64_MODE_STACK_IND: case UNWIND_X86_64_MODE_STACK_IND:
{ {
// The clang in Xcode 6 is emitting incorrect compact unwind encodings for this // The clang in Xcode 6 is emitting incorrect compact unwind encodings for this
// style of unwind. It was fixed in llvm r217020. // style of unwind. It was fixed in llvm r217020.
// The clang in Xcode 7 has this fixed. // The clang in Xcode 7 has this fixed.
return false; return false;
} }
@ -861,7 +901,7 @@ CompactUnwindInfo::CreateUnwindPlan_x86_64 (Target &target, FunctionInfo &functi
// We need to include (up to) 6 registers in 10 bits. // 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 // That would be 18 bits if we just used 3 bits per reg to indicate
// the order they're saved on the stack. // the order they're saved on the stack.
// //
// This is done with Lehmer code permutation, e.g. see // This is done with Lehmer code permutation, e.g. see
// http://stackoverflow.com/questions/1506078/fast-permutation-number-permutation-mapping-algorithms // http://stackoverflow.com/questions/1506078/fast-permutation-number-permutation-mapping-algorithms
@ -871,7 +911,7 @@ CompactUnwindInfo::CreateUnwindPlan_x86_64 (Target &target, FunctionInfo &functi
// and gives us the Lehmer code sequence which can then // and gives us the Lehmer code sequence which can then
// be decoded. // be decoded.
switch (register_count) switch (register_count)
{ {
case 6: case 6:
permunreg[0] = permutation/120; // 120 == 5! permunreg[0] = permutation/120; // 120 == 5!
@ -921,7 +961,7 @@ CompactUnwindInfo::CreateUnwindPlan_x86_64 (Target &target, FunctionInfo &functi
permunreg[0] = permutation; permunreg[0] = permutation;
break; break;
} }
// Decode the Lehmer code for this permutation of // Decode the Lehmer code for this permutation of
// the registers v. http://en.wikipedia.org/wiki/Lehmer_code // the registers v. http://en.wikipedia.org/wiki/Lehmer_code
@ -1048,7 +1088,7 @@ CompactUnwindInfo::CreateUnwindPlan_i386 (Target &target, FunctionInfo &function
row->SetRegisterLocationToAtCFAPlusOffset (i386_eh_regnum::ebp, wordsize * -2, true); row->SetRegisterLocationToAtCFAPlusOffset (i386_eh_regnum::ebp, wordsize * -2, true);
row->SetRegisterLocationToAtCFAPlusOffset (i386_eh_regnum::eip, wordsize * -1, true); row->SetRegisterLocationToAtCFAPlusOffset (i386_eh_regnum::eip, wordsize * -1, true);
row->SetRegisterLocationToIsCFAPlusOffset (i386_eh_regnum::esp, 0, 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_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); uint32_t saved_registers_locations = EXTRACT_BITS (function_info.encoding, UNWIND_X86_EBP_FRAME_REGISTERS);
@ -1129,13 +1169,13 @@ CompactUnwindInfo::CreateUnwindPlan_i386 (Target &target, FunctionInfo &function
row->SetOffset (0); row->SetOffset (0);
row->SetRegisterLocationToAtCFAPlusOffset (i386_eh_regnum::eip, wordsize * -1, true); row->SetRegisterLocationToAtCFAPlusOffset (i386_eh_regnum::eip, wordsize * -1, true);
row->SetRegisterLocationToIsCFAPlusOffset (i386_eh_regnum::esp, 0, true); row->SetRegisterLocationToIsCFAPlusOffset (i386_eh_regnum::esp, 0, true);
if (register_count > 0) if (register_count > 0)
{ {
// We need to include (up to) 6 registers in 10 bits. // 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 // That would be 18 bits if we just used 3 bits per reg to indicate
// the order they're saved on the stack. // the order they're saved on the stack.
// //
// This is done with Lehmer code permutation, e.g. see // This is done with Lehmer code permutation, e.g. see
// http://stackoverflow.com/questions/1506078/fast-permutation-number-permutation-mapping-algorithms // http://stackoverflow.com/questions/1506078/fast-permutation-number-permutation-mapping-algorithms
@ -1145,7 +1185,7 @@ CompactUnwindInfo::CreateUnwindPlan_i386 (Target &target, FunctionInfo &function
// and gives us the Lehmer code sequence which can then // and gives us the Lehmer code sequence which can then
// be decoded. // be decoded.
switch (register_count) switch (register_count)
{ {
case 6: case 6:
permunreg[0] = permutation/120; // 120 == 5! permunreg[0] = permutation/120; // 120 == 5!
@ -1195,7 +1235,7 @@ CompactUnwindInfo::CreateUnwindPlan_i386 (Target &target, FunctionInfo &function
permunreg[0] = permutation; permunreg[0] = permutation;
break; break;
} }
// Decode the Lehmer code for this permutation of // Decode the Lehmer code for this permutation of
// the registers v. http://en.wikipedia.org/wiki/Lehmer_code // the registers v. http://en.wikipedia.org/wiki/Lehmer_code
@ -1277,20 +1317,58 @@ enum arm64_eh_regnum {
pc = 32, pc = 32,
// Compact unwind encodes d8-d15 but we don't have eh_frame / dwarf reg #'s for the 64-bit // 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 // 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 // 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 // at a lower level and we'd try to fetch 128 bits if we were told that v8 were stored on
// the stack... // the stack...
v8 = 72, v8 = 72,
v9 = 73, v9 = 73,
v10 = 74, v10 = 74,
v11 = 75, v11 = 75,
v12 = 76, v12 = 76,
v13 = 77, v13 = 77,
v14 = 78, v14 = 78,
v15 = 79, 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 bool
CompactUnwindInfo::CreateUnwindPlan_arm64 (Target &target, FunctionInfo &function_info, UnwindPlan &unwind_plan, Address pc_or_function_start) CompactUnwindInfo::CreateUnwindPlan_arm64 (Target &target, FunctionInfo &function_info, UnwindPlan &unwind_plan, Address pc_or_function_start)
{ {
@ -1340,7 +1418,7 @@ CompactUnwindInfo::CreateUnwindPlan_arm64 (Target &target, FunctionInfo &functio
row->SetRegisterLocationToIsCFAPlusOffset (arm64_eh_regnum::sp, 0, true); row->SetRegisterLocationToIsCFAPlusOffset (arm64_eh_regnum::sp, 0, true);
int reg_pairs_saved_count = 1; int reg_pairs_saved_count = 1;
uint32_t saved_register_bits = function_info.encoding & 0xfff; uint32_t saved_register_bits = function_info.encoding & 0xfff;
if (saved_register_bits & UNWIND_ARM64_FRAME_X19_X20_PAIR) if (saved_register_bits & UNWIND_ARM64_FRAME_X19_X20_PAIR)
@ -1417,3 +1495,179 @@ CompactUnwindInfo::CreateUnwindPlan_arm64 (Target &target, FunctionInfo &functio
return true; 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.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;
}

11
lldb/source/Symbol/DWARFCallFrameInfo.cpp
View File

@ -316,6 +316,14 @@ DWARFCallFrameInfo::GetFDEIndex ()
Timer scoped_timer (__PRETTY_FUNCTION__, "%s - %s", __PRETTY_FUNCTION__, m_objfile.GetFileSpec().GetFilename().AsCString("")); Timer scoped_timer (__PRETTY_FUNCTION__, "%s - %s", __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; lldb::offset_t offset = 0;
if (m_cfi_data_initialized == false) if (m_cfi_data_initialized == false)
GetCFIData(); GetCFIData();
@ -376,6 +384,9 @@ DWARFCallFrameInfo::GetFDEIndex ()
const lldb::addr_t data_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); 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); 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); FDEEntryMap::Entry fde (addr, length, current_entry);
m_fde_index.Append(fde); m_fde_index.Append(fde);

4
lldb/tools/compact-unwind/compact-unwind-dumper.c
View File

@ -1094,7 +1094,7 @@ print_encoding_armv7 (struct baton baton, uint8_t *function_start, uint32_t enco
case UNWIND_ARM_MODE_FRAME_D: case UNWIND_ARM_MODE_FRAME_D:
case UNWIND_ARM_MODE_FRAME: case UNWIND_ARM_MODE_FRAME:
{ {
int stack_adjust = EXTRACT_BITS (mode, UNWIND_ARM_FRAME_STACK_ADJUST_MASK); int stack_adjust = EXTRACT_BITS (encoding, UNWIND_ARM_FRAME_STACK_ADJUST_MASK) * wordsize;
printf ("frame func: CFA is fp+%d ", (2 * wordsize) + stack_adjust); printf ("frame func: CFA is fp+%d ", (2 * wordsize) + stack_adjust);
int cfa_offset = -stack_adjust; int cfa_offset = -stack_adjust;
@ -1146,7 +1146,7 @@ print_encoding_armv7 (struct baton baton, uint8_t *function_start, uint32_t enco
printf (" r8=[CFA%d]", cfa_offset); printf (" r8=[CFA%d]", cfa_offset);
} }
if (mode & UNWIND_ARM_MODE_FRAME_D) if (mode == UNWIND_ARM_MODE_FRAME_D)
{ {
uint32_t d_reg_bits = EXTRACT_BITS (encoding, UNWIND_ARM_FRAME_D_REG_COUNT_MASK); uint32_t d_reg_bits = EXTRACT_BITS (encoding, UNWIND_ARM_FRAME_D_REG_COUNT_MASK);
switch (d_reg_bits) switch (d_reg_bits)