Merge "Move sp/pc not changing check into Unwinder."
diff --git a/libunwindstack/DwarfSection.cpp b/libunwindstack/DwarfSection.cpp
index b8164c5..2292168 100644
--- a/libunwindstack/DwarfSection.cpp
+++ b/libunwindstack/DwarfSection.cpp
@@ -107,7 +107,6 @@
return false;
}
- AddressType prev_pc = regs->pc();
AddressType prev_cfa = regs->sp();
AddressType cfa;
@@ -233,8 +232,8 @@
*finished = (cur_regs->pc() == 0) ? true : false;
cur_regs->set_sp(cfa);
- // Return false if the unwind is not finished or the cfa and pc didn't change.
- return *finished || prev_cfa != cfa || prev_pc != cur_regs->pc();
+
+ return true;
}
template <typename AddressType>
diff --git a/libunwindstack/Unwinder.cpp b/libunwindstack/Unwinder.cpp
index 2190711..2e46a11 100644
--- a/libunwindstack/Unwinder.cpp
+++ b/libunwindstack/Unwinder.cpp
@@ -87,8 +87,10 @@
bool return_address_attempt = false;
bool adjust_pc = false;
for (; frames_.size() < max_frames_;) {
- MapInfo* map_info = maps_->Find(regs_->pc());
+ uint64_t cur_pc = regs_->pc();
+ uint64_t cur_sp = regs_->sp();
+ MapInfo* map_info = maps_->Find(regs_->pc());
uint64_t rel_pc;
Elf* elf;
if (map_info == nullptr) {
@@ -138,6 +140,7 @@
}
}
}
+
if (!stepped) {
if (return_address_attempt) {
// Remove the speculative frame.
@@ -157,6 +160,11 @@
} else {
return_address_attempt = false;
}
+
+ // If the pc and sp didn't change, then consider everything stopped.
+ if (cur_pc == regs_->pc() && cur_sp == regs_->sp()) {
+ break;
+ }
}
}
diff --git a/libunwindstack/tests/DwarfSectionImplTest.cpp b/libunwindstack/tests/DwarfSectionImplTest.cpp
index 7e85bbb..5b9f3ee 100644
--- a/libunwindstack/tests/DwarfSectionImplTest.cpp
+++ b/libunwindstack/tests/DwarfSectionImplTest.cpp
@@ -431,22 +431,6 @@
EXPECT_EQ(0x80000000U, regs.pc());
}
-TYPED_TEST_P(DwarfSectionImplTest, Eval_same_cfa_same_pc) {
- DwarfCie cie{.version = 3, .return_address_register = 5};
- RegsImplFake<TypeParam> regs(10, 9);
- dwarf_loc_regs_t loc_regs;
-
- regs.set_pc(0x100);
- regs.set_sp(0x2000);
- regs[5] = 0x100;
- regs[8] = 0x2000;
- loc_regs[CFA_REG] = DwarfLocation{DWARF_LOCATION_REGISTER, {8, 0}};
- bool finished;
- ASSERT_FALSE(this->section_->Eval(&cie, &this->memory_, loc_regs, ®s, &finished));
- EXPECT_EQ(0x2000U, regs.sp());
- EXPECT_EQ(0x100U, regs.pc());
-}
-
TYPED_TEST_P(DwarfSectionImplTest, GetCie_fail_should_not_cache) {
ASSERT_TRUE(this->section_->GetCie(0x4000) == nullptr);
EXPECT_EQ(DWARF_ERROR_MEMORY_INVALID, this->section_->last_error());
@@ -872,9 +856,9 @@
Eval_cfa_bad, Eval_cfa_register_prev, Eval_cfa_register_from_value, Eval_double_indirection,
Eval_invalid_register, Eval_different_reg_locations, Eval_return_address_undefined,
Eval_pc_zero, Eval_return_address, Eval_ignore_large_reg_loc, Eval_reg_expr, Eval_reg_val_expr,
- Eval_same_cfa_same_pc, GetCie_fail_should_not_cache, GetCie_32_version_check,
- GetCie_negative_data_alignment_factor, GetCie_64_no_augment, GetCie_augment, GetCie_version_3,
- GetCie_version_4, GetFdeFromOffset_fail_should_not_cache, GetFdeFromOffset_32_no_augment,
+ GetCie_fail_should_not_cache, GetCie_32_version_check, GetCie_negative_data_alignment_factor,
+ GetCie_64_no_augment, GetCie_augment, GetCie_version_3, GetCie_version_4,
+ GetFdeFromOffset_fail_should_not_cache, GetFdeFromOffset_32_no_augment,
GetFdeFromOffset_32_no_augment_non_zero_segment_size, GetFdeFromOffset_32_augment,
GetFdeFromOffset_64_no_augment, GetFdeFromOffset_cached, GetCfaLocationInfo_cie_not_cached,
GetCfaLocationInfo_cie_cached, Log);
diff --git a/libunwindstack/tests/UnwinderTest.cpp b/libunwindstack/tests/UnwinderTest.cpp
index 8a90bae..869d118 100644
--- a/libunwindstack/tests/UnwinderTest.cpp
+++ b/libunwindstack/tests/UnwinderTest.cpp
@@ -127,6 +127,7 @@
void SetUp() override {
ElfInterfaceFake::FakeClear();
regs_.FakeSetMachineType(EM_ARM);
+ regs_.FakeSetReturnAddressValid(false);
}
static MapsFake maps_;
@@ -610,6 +611,71 @@
EXPECT_EQ(PROT_READ | PROT_WRITE, frame->map_flags);
}
+// Verify that an unwind stops when the sp and pc don't change.
+TEST_F(UnwinderTest, sp_pc_do_not_change) {
+ ElfInterfaceFake::FakePushFunctionData(FunctionData("Frame0", 0));
+ ElfInterfaceFake::FakePushFunctionData(FunctionData("Frame1", 1));
+ ElfInterfaceFake::FakePushFunctionData(FunctionData("Frame2", 2));
+ ElfInterfaceFake::FakePushFunctionData(FunctionData("Frame3", 3));
+ ElfInterfaceFake::FakePushFunctionData(FunctionData("Frame4", 4));
+
+ regs_.FakeSetPc(0x1000);
+ regs_.FakeSetSp(0x10000);
+ ElfInterfaceFake::FakePushStepData(StepData(0x33402, 0x10010, false));
+ ElfInterfaceFake::FakePushStepData(StepData(0x33502, 0x10020, false));
+ ElfInterfaceFake::FakePushStepData(StepData(0x33502, 0x10020, false));
+ ElfInterfaceFake::FakePushStepData(StepData(0x33502, 0x10020, false));
+ ElfInterfaceFake::FakePushStepData(StepData(0x33502, 0x10020, false));
+ ElfInterfaceFake::FakePushStepData(StepData(0, 0, true));
+
+ Unwinder unwinder(64, &maps_, ®s_, process_memory_);
+ unwinder.Unwind();
+
+ ASSERT_EQ(3U, unwinder.NumFrames());
+
+ auto* frame = &unwinder.frames()[0];
+ EXPECT_EQ(0U, frame->num);
+ EXPECT_EQ(0U, frame->rel_pc);
+ EXPECT_EQ(0x1000U, frame->pc);
+ EXPECT_EQ(0x10000U, frame->sp);
+ EXPECT_EQ("Frame0", frame->function_name);
+ EXPECT_EQ(0U, frame->function_offset);
+ EXPECT_EQ("/system/fake/libc.so", frame->map_name);
+ EXPECT_EQ(0U, frame->map_offset);
+ EXPECT_EQ(0x1000U, frame->map_start);
+ EXPECT_EQ(0x8000U, frame->map_end);
+ EXPECT_EQ(0U, frame->map_load_bias);
+ EXPECT_EQ(PROT_READ | PROT_WRITE, frame->map_flags);
+
+ frame = &unwinder.frames()[1];
+ EXPECT_EQ(1U, frame->num);
+ EXPECT_EQ(0x400U, frame->rel_pc);
+ EXPECT_EQ(0x33400U, frame->pc);
+ EXPECT_EQ(0x10010U, frame->sp);
+ EXPECT_EQ("Frame1", frame->function_name);
+ EXPECT_EQ(1U, frame->function_offset);
+ EXPECT_EQ("/fake/compressed.so", frame->map_name);
+ EXPECT_EQ(0U, frame->map_offset);
+ EXPECT_EQ(0x33000U, frame->map_start);
+ EXPECT_EQ(0x34000U, frame->map_end);
+ EXPECT_EQ(0U, frame->map_load_bias);
+ EXPECT_EQ(PROT_READ | PROT_WRITE, frame->map_flags);
+
+ frame = &unwinder.frames()[2];
+ EXPECT_EQ(2U, frame->num);
+ EXPECT_EQ(0x500U, frame->rel_pc);
+ EXPECT_EQ(0x33500U, frame->pc);
+ EXPECT_EQ(0x10020U, frame->sp);
+ EXPECT_EQ("Frame2", frame->function_name);
+ EXPECT_EQ(2U, frame->function_offset);
+ EXPECT_EQ("/fake/compressed.so", frame->map_name);
+ EXPECT_EQ(0U, frame->map_offset);
+ EXPECT_EQ(0x33000U, frame->map_start);
+ EXPECT_EQ(0x34000U, frame->map_end);
+ EXPECT_EQ(0U, frame->map_load_bias);
+ EXPECT_EQ(PROT_READ | PROT_WRITE, frame->map_flags);
+}
+
// Verify format frame code.
TEST_F(UnwinderTest, format_frame_static) {
FrameData frame;