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Enable reading DWARF4 CIEs with 32 bit addresses.

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- Reading DWARF4 CIEs was added in
https://chromium-review.googlesource.com/c/breakpad/breakpad/+/406012 but it
was only enabled for 64bit builds, since it would error out if the CIE
address size was not 8 bytes.
- Added a unit test to ensure that 32bit continues to work.

Change-Id: I824bb40cdf12056d39da335adb55ed315970fb88
Reviewed-on: https://chromium-review.googlesource.com/c/breakpad/breakpad/+/1941034
Reviewed-by: Ivan Penkov <ivanpe@chromium.org>
Reviewed-by: Mark Mentovai <mark@chromium.org>
This commit is contained in:
Nelson Billing 2019-12-03 15:00:30 -08:00
parent 5bc3092b30
commit f32b83eb08
3 changed files with 53 additions and 18 deletions
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27
src/common/dwarf/dwarf2reader.cc
View file

@ -2330,21 +2330,15 @@ bool CallFrameInfo::ReadCIEFields(CIE *cie) {
}
if (cie->version >= 4) {
uint8_t address_size = *cursor++;
if (address_size != 8) {
// TODO(scottmg): Only supporting x64 for now.
reporter_->UnexpectedAddressSize(cie->offset, address_size);
cie->address_size = *cursor++;
if (cie->address_size != 8 && cie->address_size != 4) {
reporter_->UnexpectedAddressSize(cie->offset, cie->address_size);
return false;
}
uint8_t segment_size = *cursor++;
if (segment_size != 0) {
// TODO(scottmg): Only supporting x64 for now.
// I would have perhaps expected 4 here, but LLVM emits a 0, near
// http://llvm.org/docs/doxygen/html/MCDwarf_8cpp_source.html#l00606. As
// we are not using the value, only succeed for now if it's the expected
// 0.
reporter_->UnexpectedSegmentSize(cie->offset, segment_size);
cie->segment_size = *cursor++;
if (cie->segment_size != 0) {
reporter_->UnexpectedSegmentSize(cie->offset, cie->segment_size);
return false;
}
}
@ -2606,6 +2600,15 @@ bool CallFrameInfo::Start() {
if (!ReadCIEFields(&cie))
continue;
// TODO(nbilling): This could lead to strange behavior if a single buffer
// contained a mixture of DWARF versions as well as address sizes. Not
// sure if it's worth handling such a case.
// DWARF4 CIE specifies address_size, so use it for this call frame.
if (cie.version >= 4) {
reader_->SetAddressSize(cie.address_size);
}
// We now have the values that govern both the CIE and the FDE.
cie.cie = &cie;
fde.cie = &cie;

5
src/common/dwarf/dwarf2reader.h
View file

@ -999,6 +999,11 @@ class CallFrameInfo {
// or not we saw a 'z' augmentation string; its default value is
// DW_EH_PE_absptr, which is what normal DWARF CFI uses.
DwarfPointerEncoding pointer_encoding;
// These were only introduced in DWARF4, so will not be set in older
// versions.
uint8 address_size;
uint8 segment_size;
};
// A frame description entry (FDE).

39
src/common/dwarf/dwarf2reader_cfi_unittest.cc
View file

@ -608,11 +608,11 @@ TEST_F(CFI, CIEVersion3ReturnColumn) {
}
TEST_F(CFI, CIEVersion4AdditionalFields) {
CFISection section(kBigEndian, 4);
CFISection section(kBigEndian, 8);
Label cie;
section
.Mark(&cie)
// CIE version 4 with expected address and segment size.
// CIE version 4 with expected address (64bit) and segment size.
.CIEHeader(0x0ab4758d, 0xc010fdf7, 0x89, 4, "", true, 8, 0)
.FinishEntry()
// FDE, citing that CIE.
@ -631,7 +631,36 @@ TEST_F(CFI, CIEVersion4AdditionalFields) {
string contents;
EXPECT_TRUE(section.GetContents(&contents));
ByteReader byte_reader(ENDIANNESS_BIG);
byte_reader.SetAddressSize(4);
CallFrameInfo parser(reinterpret_cast<const uint8_t *>(contents.data()),
contents.size(),
&byte_reader, &handler, &reporter);
EXPECT_TRUE(parser.Start());
}
TEST_F(CFI, CIEVersion4AdditionalFields32BitAddress) {
CFISection section(kBigEndian, 4);
Label cie;
section
.Mark(&cie)
// CIE version 4 with expected address (32bit) and segment size.
.CIEHeader(0x0ab4758d, 0xc010fdf7, 0x89, 4, "", true, 4, 0)
.FinishEntry()
// FDE, citing that CIE.
.FDEHeader(cie, 0x86763f2b, 0x2a66dc23)
.FinishEntry();
PERHAPS_WRITE_DEBUG_FRAME_FILE("CIEVersion3ReturnColumn", section);
{
InSequence s;
EXPECT_CALL(handler, Entry(_, 0x86763f2b, 0x2a66dc23, 4, "", 0x89))
.WillOnce(Return(true));
EXPECT_CALL(handler, End()).WillOnce(Return(true));
}
string contents;
EXPECT_TRUE(section.GetContents(&contents));
ByteReader byte_reader(ENDIANNESS_BIG);
CallFrameInfo parser(reinterpret_cast<const uint8_t *>(contents.data()),
contents.size(),
&byte_reader, &handler, &reporter);
@ -659,7 +688,6 @@ TEST_F(CFI, CIEVersion4AdditionalFieldsUnexpectedAddressSize) {
string contents;
EXPECT_TRUE(section.GetContents(&contents));
ByteReader byte_reader(ENDIANNESS_BIG);
byte_reader.SetAddressSize(8);
CallFrameInfo parser(reinterpret_cast<const uint8_t *>(contents.data()),
contents.size(),
&byte_reader, &handler, &reporter);
@ -667,7 +695,7 @@ TEST_F(CFI, CIEVersion4AdditionalFieldsUnexpectedAddressSize) {
}
TEST_F(CFI, CIEVersion4AdditionalFieldsUnexpectedSegmentSize) {
CFISection section(kBigEndian, 4);
CFISection section(kBigEndian, 8);
Label cie;
section
@ -685,7 +713,6 @@ TEST_F(CFI, CIEVersion4AdditionalFieldsUnexpectedSegmentSize) {
string contents;
EXPECT_TRUE(section.GetContents(&contents));
ByteReader byte_reader(ENDIANNESS_BIG);
byte_reader.SetAddressSize(8);
CallFrameInfo parser(reinterpret_cast<const uint8_t *>(contents.data()),
contents.size(),
&byte_reader, &handler, &reporter);