Fix bug when doing signal handler lookup.
The new lld linker uses all non-zero offset executable maps. There was
a bug when trying to find if the stack is in a signal handler that caused
the code to read the wrong place in the elf. Fixed by not adding the elf
offset to the relative pc.
Also fixed the unwind_for_offline tool to dump multiple stacks if necessary.
Added new offline unit test that would have failed with the old code.
Bug: 79936827
Test: Ran unit tests and libbacktrace unit tests.
Test: Dumped backtraces of system pids.
Test: Ran 137-cfi art test.
Change-Id: Iaca8c18c2a314902e64c3f72831234297e8dcb1b
diff --git a/libunwindstack/tests/ElfTest.cpp b/libunwindstack/tests/ElfTest.cpp
index f9028c4..aecbf6d 100644
--- a/libunwindstack/tests/ElfTest.cpp
+++ b/libunwindstack/tests/ElfTest.cpp
@@ -133,7 +133,7 @@
ASSERT_FALSE(elf.GetFunctionName(0, &name, &func_offset));
bool finished;
- ASSERT_FALSE(elf.Step(0, 0, 0, nullptr, nullptr, &finished));
+ ASSERT_FALSE(elf.Step(0, 0, nullptr, nullptr, &finished));
}
TEST_F(ElfTest, elf32_invalid_machine) {
@@ -330,7 +330,7 @@
elf.FakeSetValid(true);
elf.FakeSetLoadBias(0);
bool finished;
- ASSERT_TRUE(elf.Step(0x1000, 0x1000, 0x2000, ®s, &process_memory, &finished));
+ ASSERT_TRUE(elf.Step(0x3000, 0x1000, ®s, &process_memory, &finished));
EXPECT_FALSE(finished);
EXPECT_EQ(15U, regs.pc());
EXPECT_EQ(13U, regs.sp());
@@ -370,7 +370,7 @@
EXPECT_CALL(*interface, Step(0x1000, 0, ®s, &process_memory, &finished))
.WillOnce(::testing::Return(true));
- ASSERT_TRUE(elf.Step(0x1004, 0x1000, 0x2000, ®s, &process_memory, &finished));
+ ASSERT_TRUE(elf.Step(0x1004, 0x1000, ®s, &process_memory, &finished));
}
TEST_F(ElfTest, step_in_interface_non_zero_load_bias) {
@@ -388,7 +388,7 @@
EXPECT_CALL(*interface, Step(0x7300, 0x4000, ®s, &process_memory, &finished))
.WillOnce(::testing::Return(true));
- ASSERT_TRUE(elf.Step(0x7304, 0x7300, 0x2000, ®s, &process_memory, &finished));
+ ASSERT_TRUE(elf.Step(0x7304, 0x7300, ®s, &process_memory, &finished));
}
TEST_F(ElfTest, get_global_invalid_elf) {
diff --git a/libunwindstack/tests/UnwindOfflineTest.cpp b/libunwindstack/tests/UnwindOfflineTest.cpp
index 2b8f0c2..285fc9e 100644
--- a/libunwindstack/tests/UnwindOfflineTest.cpp
+++ b/libunwindstack/tests/UnwindOfflineTest.cpp
@@ -46,6 +46,12 @@
namespace unwindstack {
+static void AddMemory(std::string file_name, MemoryOfflineParts* parts) {
+ MemoryOffline* memory = new MemoryOffline;
+ ASSERT_TRUE(memory->Init(file_name.c_str(), 0));
+ parts->Add(memory);
+}
+
class UnwindOfflineTest : public ::testing::Test {
protected:
void TearDown() override {
@@ -64,9 +70,24 @@
maps_.reset(new BufferMaps(data.c_str()));
ASSERT_TRUE(maps_->Parse());
- std::unique_ptr<MemoryOffline> stack_memory(new MemoryOffline);
- ASSERT_TRUE(stack_memory->Init((dir_ + "stack.data").c_str(), 0));
- process_memory_.reset(stack_memory.release());
+ std::string stack_name(dir_ + "stack.data");
+ struct stat st;
+ if (stat(stack_name.c_str(), &st) == 0 && S_ISREG(st.st_mode)) {
+ std::unique_ptr<MemoryOffline> stack_memory(new MemoryOffline);
+ ASSERT_TRUE(stack_memory->Init((dir_ + "stack.data").c_str(), 0));
+ process_memory_.reset(stack_memory.release());
+ } else {
+ std::unique_ptr<MemoryOfflineParts> stack_memory(new MemoryOfflineParts);
+ for (size_t i = 0;; i++) {
+ stack_name = dir_ + "stack" + std::to_string(i) + ".data";
+ if (stat(stack_name.c_str(), &st) == -1 || !S_ISREG(st.st_mode)) {
+ ASSERT_TRUE(i != 0) << "No stack data files found.";
+ break;
+ }
+ AddMemory(stack_name, stack_memory.get());
+ }
+ process_memory_.reset(stack_memory.release());
+ }
switch (arch) {
case ARCH_ARM: {
@@ -180,7 +201,7 @@
}
TEST_F(UnwindOfflineTest, pc_straddle_arm) {
- Init("straddle_arm/", ARCH_ARM);
+ ASSERT_NO_FATAL_FAILURE(Init("straddle_arm/", ARCH_ARM));
Unwinder unwinder(128, maps_.get(), regs_.get(), process_memory_);
unwinder.Unwind();
@@ -204,7 +225,7 @@
}
TEST_F(UnwindOfflineTest, pc_in_gnu_debugdata_arm) {
- Init("gnu_debugdata_arm/", ARCH_ARM);
+ ASSERT_NO_FATAL_FAILURE(Init("gnu_debugdata_arm/", ARCH_ARM));
Unwinder unwinder(128, maps_.get(), regs_.get(), process_memory_);
unwinder.Unwind();
@@ -224,7 +245,7 @@
}
TEST_F(UnwindOfflineTest, pc_straddle_arm64) {
- Init("straddle_arm64/", ARCH_ARM64);
+ ASSERT_NO_FATAL_FAILURE(Init("straddle_arm64/", ARCH_ARM64));
Unwinder unwinder(128, maps_.get(), regs_.get(), process_memory_);
unwinder.Unwind();
@@ -255,14 +276,8 @@
EXPECT_EQ(0x7fe0d84110U, unwinder.frames()[5].sp);
}
-static void AddMemory(std::string file_name, MemoryOfflineParts* parts) {
- MemoryOffline* memory = new MemoryOffline;
- ASSERT_TRUE(memory->Init(file_name.c_str(), 0));
- parts->Add(memory);
-}
-
TEST_F(UnwindOfflineTest, jit_debug_x86) {
- Init("jit_debug_x86/", ARCH_X86);
+ ASSERT_NO_FATAL_FAILURE(Init("jit_debug_x86/", ARCH_X86));
MemoryOfflineParts* memory = new MemoryOfflineParts;
AddMemory(dir_ + "descriptor.data", memory);
@@ -555,7 +570,7 @@
}
TEST_F(UnwindOfflineTest, jit_debug_arm) {
- Init("jit_debug_arm/", ARCH_ARM);
+ ASSERT_NO_FATAL_FAILURE(Init("jit_debug_arm/", ARCH_ARM));
MemoryOfflineParts* memory = new MemoryOfflineParts;
AddMemory(dir_ + "descriptor.data", memory);
@@ -873,7 +888,7 @@
// fallback to iterating over the cies/fdes and ignore the eh_frame_hdr.
// No .gnu_debugdata section in the elf file, so no symbols.
TEST_F(UnwindOfflineTest, bad_eh_frame_hdr_arm64) {
- Init("bad_eh_frame_hdr_arm64/", ARCH_ARM64);
+ ASSERT_NO_FATAL_FAILURE(Init("bad_eh_frame_hdr_arm64/", ARCH_ARM64));
Unwinder unwinder(128, maps_.get(), regs_.get(), process_memory_);
unwinder.Unwind();
@@ -902,7 +917,7 @@
// The elf has bad eh_frame unwind information for the pcs. If eh_frame
// is used first, the unwind will not match the expected output.
TEST_F(UnwindOfflineTest, debug_frame_first_x86) {
- Init("debug_frame_first_x86/", ARCH_X86);
+ ASSERT_NO_FATAL_FAILURE(Init("debug_frame_first_x86/", ARCH_X86));
Unwinder unwinder(128, maps_.get(), regs_.get(), process_memory_);
unwinder.Unwind();
@@ -930,7 +945,7 @@
// Make sure that a pc that is at the beginning of an fde unwinds correctly.
TEST_F(UnwindOfflineTest, eh_frame_hdr_begin_x86_64) {
- Init("eh_frame_hdr_begin_x86_64/", ARCH_X86_64);
+ ASSERT_NO_FATAL_FAILURE(Init("eh_frame_hdr_begin_x86_64/", ARCH_X86_64));
Unwinder unwinder(128, maps_.get(), regs_.get(), process_memory_);
unwinder.Unwind();
@@ -957,7 +972,7 @@
}
TEST_F(UnwindOfflineTest, art_quick_osr_stub_arm) {
- Init("art_quick_osr_stub_arm/", ARCH_ARM);
+ ASSERT_NO_FATAL_FAILURE(Init("art_quick_osr_stub_arm/", ARCH_ARM));
MemoryOfflineParts* memory = new MemoryOfflineParts;
AddMemory(dir_ + "descriptor.data", memory);
@@ -1072,7 +1087,7 @@
}
TEST_F(UnwindOfflineTest, jit_map_arm) {
- Init("jit_map_arm/", ARCH_ARM);
+ ASSERT_NO_FATAL_FAILURE(Init("jit_map_arm/", ARCH_ARM));
maps_->Add(0xd025c788, 0xd025c9f0, 0, PROT_READ | PROT_EXEC | MAPS_FLAGS_JIT_SYMFILE_MAP,
"jit_map0.so", 0);
@@ -1111,4 +1126,78 @@
EXPECT_EQ(0xcd4ff960U, unwinder.frames()[5].sp);
}
+TEST_F(UnwindOfflineTest, offset_arm) {
+ ASSERT_NO_FATAL_FAILURE(Init("offset_arm/", ARCH_ARM));
+
+ Unwinder unwinder(128, maps_.get(), regs_.get(), process_memory_);
+ unwinder.Unwind();
+
+ std::string frame_info(DumpFrames(unwinder));
+ ASSERT_EQ(19U, unwinder.NumFrames()) << "Unwind:\n" << frame_info;
+ EXPECT_EQ(
+ " #00 pc 0032bfa0 (offset 0x42000) libunwindstack_test (SignalInnerFunction+40)\n"
+ " #01 pc 0032bfeb (offset 0x42000) libunwindstack_test (SignalMiddleFunction+2)\n"
+ " #02 pc 0032bff3 (offset 0x42000) libunwindstack_test (SignalOuterFunction+2)\n"
+ " #03 pc 0032fed3 (offset 0x42000) libunwindstack_test "
+ "(_ZN11unwindstackL19SignalCallerHandlerEiP7siginfoPv+26)\n"
+ " #04 pc 00026528 (offset 0x25000) libc.so\n"
+ " #05 pc 00000000 <unknown>\n"
+ " #06 pc 0032c2d9 (offset 0x42000) libunwindstack_test (InnerFunction+736)\n"
+ " #07 pc 0032cc4f (offset 0x42000) libunwindstack_test (MiddleFunction+42)\n"
+ " #08 pc 0032cc81 (offset 0x42000) libunwindstack_test (OuterFunction+42)\n"
+ " #09 pc 0032e547 (offset 0x42000) libunwindstack_test "
+ "(_ZN11unwindstackL19RemoteThroughSignalEij+270)\n"
+ " #10 pc 0032ed99 (offset 0x42000) libunwindstack_test "
+ "(_ZN11unwindstack55UnwindTest_remote_through_signal_with_invalid_func_Test8TestBodyEv+16)\n"
+ " #11 pc 00354453 (offset 0x42000) libunwindstack_test (_ZN7testing4Test3RunEv+154)\n"
+ " #12 pc 00354de7 (offset 0x42000) libunwindstack_test (_ZN7testing8TestInfo3RunEv+194)\n"
+ " #13 pc 00355105 (offset 0x42000) libunwindstack_test (_ZN7testing8TestCase3RunEv+180)\n"
+ " #14 pc 0035a215 (offset 0x42000) libunwindstack_test "
+ "(_ZN7testing8internal12UnitTestImpl11RunAllTestsEv+664)\n"
+ " #15 pc 00359f4f (offset 0x42000) libunwindstack_test (_ZN7testing8UnitTest3RunEv+110)\n"
+ " #16 pc 0034d3db (offset 0x42000) libunwindstack_test (main+38)\n"
+ " #17 pc 00092c0d (offset 0x25000) libc.so (__libc_init+48)\n"
+ " #18 pc 0004202f (offset 0x42000) libunwindstack_test (_start_main+38)\n",
+ frame_info);
+
+ EXPECT_EQ(0x2e55fa0U, unwinder.frames()[0].pc);
+ EXPECT_EQ(0xf43d2cccU, unwinder.frames()[0].sp);
+ EXPECT_EQ(0x2e55febU, unwinder.frames()[1].pc);
+ EXPECT_EQ(0xf43d2ce0U, unwinder.frames()[1].sp);
+ EXPECT_EQ(0x2e55ff3U, unwinder.frames()[2].pc);
+ EXPECT_EQ(0xf43d2ce8U, unwinder.frames()[2].sp);
+ EXPECT_EQ(0x2e59ed3U, unwinder.frames()[3].pc);
+ EXPECT_EQ(0xf43d2cf0U, unwinder.frames()[3].sp);
+ EXPECT_EQ(0xf4136528U, unwinder.frames()[4].pc);
+ EXPECT_EQ(0xf43d2d10U, unwinder.frames()[4].sp);
+ EXPECT_EQ(0U, unwinder.frames()[5].pc);
+ EXPECT_EQ(0xffcc0ee0U, unwinder.frames()[5].sp);
+ EXPECT_EQ(0x2e562d9U, unwinder.frames()[6].pc);
+ EXPECT_EQ(0xffcc0ee0U, unwinder.frames()[6].sp);
+ EXPECT_EQ(0x2e56c4fU, unwinder.frames()[7].pc);
+ EXPECT_EQ(0xffcc1060U, unwinder.frames()[7].sp);
+ EXPECT_EQ(0x2e56c81U, unwinder.frames()[8].pc);
+ EXPECT_EQ(0xffcc1078U, unwinder.frames()[8].sp);
+ EXPECT_EQ(0x2e58547U, unwinder.frames()[9].pc);
+ EXPECT_EQ(0xffcc1090U, unwinder.frames()[9].sp);
+ EXPECT_EQ(0x2e58d99U, unwinder.frames()[10].pc);
+ EXPECT_EQ(0xffcc1438U, unwinder.frames()[10].sp);
+ EXPECT_EQ(0x2e7e453U, unwinder.frames()[11].pc);
+ EXPECT_EQ(0xffcc1448U, unwinder.frames()[11].sp);
+ EXPECT_EQ(0x2e7ede7U, unwinder.frames()[12].pc);
+ EXPECT_EQ(0xffcc1458U, unwinder.frames()[12].sp);
+ EXPECT_EQ(0x2e7f105U, unwinder.frames()[13].pc);
+ EXPECT_EQ(0xffcc1490U, unwinder.frames()[13].sp);
+ EXPECT_EQ(0x2e84215U, unwinder.frames()[14].pc);
+ EXPECT_EQ(0xffcc14c0U, unwinder.frames()[14].sp);
+ EXPECT_EQ(0x2e83f4fU, unwinder.frames()[15].pc);
+ EXPECT_EQ(0xffcc1510U, unwinder.frames()[15].sp);
+ EXPECT_EQ(0x2e773dbU, unwinder.frames()[16].pc);
+ EXPECT_EQ(0xffcc1528U, unwinder.frames()[16].sp);
+ EXPECT_EQ(0xf41a2c0dU, unwinder.frames()[17].pc);
+ EXPECT_EQ(0xffcc1540U, unwinder.frames()[17].sp);
+ EXPECT_EQ(0x2b6c02fU, unwinder.frames()[18].pc);
+ EXPECT_EQ(0xffcc1558U, unwinder.frames()[18].sp);
+}
+
} // namespace unwindstack
diff --git a/libunwindstack/tests/files/offline/offset_arm/libc.so b/libunwindstack/tests/files/offline/offset_arm/libc.so
new file mode 100644
index 0000000..9f5c8ca
--- /dev/null
+++ b/libunwindstack/tests/files/offline/offset_arm/libc.so
Binary files differ
diff --git a/libunwindstack/tests/files/offline/offset_arm/libunwindstack_test b/libunwindstack/tests/files/offline/offset_arm/libunwindstack_test
new file mode 100644
index 0000000..7a30bfa
--- /dev/null
+++ b/libunwindstack/tests/files/offline/offset_arm/libunwindstack_test
Binary files differ
diff --git a/libunwindstack/tests/files/offline/offset_arm/maps.txt b/libunwindstack/tests/files/offline/offset_arm/maps.txt
new file mode 100644
index 0000000..6224464
--- /dev/null
+++ b/libunwindstack/tests/files/offline/offset_arm/maps.txt
@@ -0,0 +1,2 @@
+2b6c000-2e92000 r-xp 42000 00:00 0 libunwindstack_test
+f4135000-f41a9000 r-xp 25000 00:00 0 libc.so
diff --git a/libunwindstack/tests/files/offline/offset_arm/regs.txt b/libunwindstack/tests/files/offline/offset_arm/regs.txt
new file mode 100644
index 0000000..1f4ac8f
--- /dev/null
+++ b/libunwindstack/tests/files/offline/offset_arm/regs.txt
@@ -0,0 +1,16 @@
+r0: 5
+r1: 5
+r2: 4
+r3: 1
+r4: 73804b6b
+r5: f3c9c000
+r6: 2ea09ac
+r7: 10624dd3
+r8: f41b5d8c
+r9: f3c9c000
+r10: 6f17
+r11: f3c94048
+ip: 2ea0807
+sp: f43d2ccc
+lr: 2e55fef
+pc: 2e55fa0
diff --git a/libunwindstack/tests/files/offline/offset_arm/stack0.data b/libunwindstack/tests/files/offline/offset_arm/stack0.data
new file mode 100644
index 0000000..23a9874
--- /dev/null
+++ b/libunwindstack/tests/files/offline/offset_arm/stack0.data
Binary files differ
diff --git a/libunwindstack/tests/files/offline/offset_arm/stack1.data b/libunwindstack/tests/files/offline/offset_arm/stack1.data
new file mode 100644
index 0000000..49bdd1e
--- /dev/null
+++ b/libunwindstack/tests/files/offline/offset_arm/stack1.data
Binary files differ