| // Copyright (c) 2010, Google Inc. | |
| // All rights reserved. | |
| // | |
| // Redistribution and use in source and binary forms, with or without | |
| // modification, are permitted provided that the following conditions are | |
| // met: | |
| // | |
| // * Redistributions of source code must retain the above copyright | |
| // notice, this list of conditions and the following disclaimer. | |
| // * Redistributions in binary form must reproduce the above | |
| // copyright notice, this list of conditions and the following disclaimer | |
| // in the documentation and/or other materials provided with the | |
| // distribution. | |
| // * Neither the name of Google Inc. nor the names of its | |
| // contributors may be used to endorse or promote products derived from | |
| // this software without specific prior written permission. | |
| // | |
| // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | |
| // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | |
| // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR | |
| // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT | |
| // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, | |
| // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT | |
| // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
| // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
| // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
| // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE | |
| // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
| // Original author: Jim Blandy <jimb@mozilla.com> <jimb@red-bean.com> | |
| // stackwalker_arm_unittest.cc: Unit tests for StackwalkerARM class. | |
| #include <string.h> | |
| #include <string> | |
| #include <vector> | |
| #include "breakpad_googletest_includes.h" | |
| #include "common/test_assembler.h" | |
| #include "common/using_std_string.h" | |
| #include "google_breakpad/common/minidump_format.h" | |
| #include "google_breakpad/processor/basic_source_line_resolver.h" | |
| #include "google_breakpad/processor/call_stack.h" | |
| #include "google_breakpad/processor/code_module.h" | |
| #include "google_breakpad/processor/source_line_resolver_interface.h" | |
| #include "google_breakpad/processor/stack_frame_cpu.h" | |
| #include "processor/stackwalker_unittest_utils.h" | |
| #include "processor/stackwalker_arm.h" | |
| #include "processor/windows_frame_info.h" | |
| using google_breakpad::BasicSourceLineResolver; | |
| using google_breakpad::CallStack; | |
| using google_breakpad::CodeModule; | |
| using google_breakpad::StackFrameSymbolizer; | |
| using google_breakpad::StackFrame; | |
| using google_breakpad::StackFrameARM; | |
| using google_breakpad::Stackwalker; | |
| using google_breakpad::StackwalkerARM; | |
| using google_breakpad::SystemInfo; | |
| using google_breakpad::WindowsFrameInfo; | |
| using google_breakpad::test_assembler::kLittleEndian; | |
| using google_breakpad::test_assembler::Label; | |
| using google_breakpad::test_assembler::Section; | |
| using std::vector; | |
| using testing::_; | |
| using testing::AnyNumber; | |
| using testing::DoAll; | |
| using testing::Return; | |
| using testing::SetArgumentPointee; | |
| using testing::Test; | |
| class StackwalkerARMFixture { | |
| public: | |
| StackwalkerARMFixture() | |
| : stack_section(kLittleEndian), | |
| // Give the two modules reasonable standard locations and names | |
| // for tests to play with. | |
| module1(0x40000000, 0x10000, "module1", "version1"), | |
| module2(0x50000000, 0x10000, "module2", "version2") { | |
| // Identify the system as a Linux system. | |
| system_info.os = "Linux"; | |
| system_info.os_short = "linux"; | |
| system_info.os_version = "Lugubrious Labrador"; | |
| system_info.cpu = "arm"; | |
| system_info.cpu_info = ""; | |
| // Put distinctive values in the raw CPU context. | |
| BrandContext(&raw_context); | |
| // Create some modules with some stock debugging information. | |
| modules.Add(&module1); | |
| modules.Add(&module2); | |
| // By default, none of the modules have symbol info; call | |
| // SetModuleSymbols to override this. | |
| EXPECT_CALL(supplier, GetCStringSymbolData(_, _, _, _, _)) | |
| .WillRepeatedly(Return(MockSymbolSupplier::NOT_FOUND)); | |
| // Avoid GMOCK WARNING "Uninteresting mock function call - returning | |
| // directly" for FreeSymbolData(). | |
| EXPECT_CALL(supplier, FreeSymbolData(_)).Times(AnyNumber()); | |
| // Reset max_frames_scanned since it's static. | |
| Stackwalker::set_max_frames_scanned(1024); | |
| } | |
| // Set the Breakpad symbol information that supplier should return for | |
| // MODULE to INFO. | |
| void SetModuleSymbols(MockCodeModule* module, const string& info) { | |
| size_t buffer_size; | |
| char *buffer = supplier.CopySymbolDataAndOwnTheCopy(info, &buffer_size); | |
| EXPECT_CALL(supplier, GetCStringSymbolData(module, &system_info, _, _, _)) | |
| .WillRepeatedly(DoAll(SetArgumentPointee<3>(buffer), | |
| SetArgumentPointee<4>(buffer_size), | |
| Return(MockSymbolSupplier::FOUND))); | |
| } | |
| // Populate stack_region with the contents of stack_section. Use | |
| // stack_section.start() as the region's starting address. | |
| void RegionFromSection() { | |
| string contents; | |
| ASSERT_TRUE(stack_section.GetContents(&contents)); | |
| stack_region.Init(stack_section.start().Value(), contents); | |
| } | |
| // Fill RAW_CONTEXT with pseudo-random data, for round-trip checking. | |
| void BrandContext(MDRawContextARM *raw_context) { | |
| uint8_t x = 173; | |
| for (size_t i = 0; i < sizeof(*raw_context); i++) | |
| reinterpret_cast<uint8_t*>(raw_context)[i] = (x += 17); | |
| } | |
| SystemInfo system_info; | |
| MDRawContextARM raw_context; | |
| Section stack_section; | |
| MockMemoryRegion stack_region; | |
| MockCodeModule module1; | |
| MockCodeModule module2; | |
| MockCodeModules modules; | |
| MockSymbolSupplier supplier; | |
| BasicSourceLineResolver resolver; | |
| CallStack call_stack; | |
| const vector<StackFrame*>* frames; | |
| }; | |
| class SanityCheck: public StackwalkerARMFixture, public Test { }; | |
| TEST_F(SanityCheck, NoResolver) { | |
| // Since we have no call frame information, and all unwinding | |
| // requires call frame information, the stack walk will end after | |
| // the first frame. | |
| StackFrameSymbolizer frame_symbolizer(NULL, NULL); | |
| StackwalkerARM walker(&system_info, &raw_context, -1, &stack_region, &modules, | |
| &frame_symbolizer); | |
| // This should succeed even without a resolver or supplier. | |
| vector<const CodeModule*> modules_without_symbols; | |
| vector<const CodeModule*> modules_with_corrupt_symbols; | |
| ASSERT_TRUE(walker.Walk(&call_stack, &modules_without_symbols, | |
| &modules_with_corrupt_symbols)); | |
| ASSERT_EQ(0U, modules_without_symbols.size()); | |
| ASSERT_EQ(0U, modules_with_corrupt_symbols.size()); | |
| frames = call_stack.frames(); | |
| ASSERT_EQ(1U, frames->size()); | |
| StackFrameARM *frame = static_cast<StackFrameARM*>(frames->at(0)); | |
| // Check that the values from the original raw context made it | |
| // through to the context in the stack frame. | |
| EXPECT_EQ(0, memcmp(&raw_context, &frame->context, sizeof(raw_context))); | |
| } | |
| class GetContextFrame: public StackwalkerARMFixture, public Test { }; | |
| TEST_F(GetContextFrame, Simple) { | |
| // Since we have no call frame information, and all unwinding | |
| // requires call frame information, the stack walk will end after | |
| // the first frame. | |
| StackFrameSymbolizer frame_symbolizer(&supplier, &resolver); | |
| StackwalkerARM walker(&system_info, &raw_context, -1, &stack_region, &modules, | |
| &frame_symbolizer); | |
| vector<const CodeModule*> modules_without_symbols; | |
| vector<const CodeModule*> modules_with_corrupt_symbols; | |
| ASSERT_TRUE(walker.Walk(&call_stack, &modules_without_symbols, | |
| &modules_with_corrupt_symbols)); | |
| ASSERT_EQ(0U, modules_without_symbols.size()); | |
| ASSERT_EQ(0U, modules_with_corrupt_symbols.size()); | |
| frames = call_stack.frames(); | |
| ASSERT_EQ(1U, frames->size()); | |
| StackFrameARM *frame = static_cast<StackFrameARM*>(frames->at(0)); | |
| // Check that the values from the original raw context made it | |
| // through to the context in the stack frame. | |
| EXPECT_EQ(0, memcmp(&raw_context, &frame->context, sizeof(raw_context))); | |
| } | |
| // The stackwalker should be able to produce the context frame even | |
| // without stack memory present. | |
| TEST_F(GetContextFrame, NoStackMemory) { | |
| StackFrameSymbolizer frame_symbolizer(&supplier, &resolver); | |
| StackwalkerARM walker(&system_info, &raw_context, -1, NULL, &modules, | |
| &frame_symbolizer); | |
| vector<const CodeModule*> modules_without_symbols; | |
| vector<const CodeModule*> modules_with_corrupt_symbols; | |
| ASSERT_TRUE(walker.Walk(&call_stack, &modules_without_symbols, | |
| &modules_with_corrupt_symbols)); | |
| ASSERT_EQ(0U, modules_without_symbols.size()); | |
| ASSERT_EQ(0U, modules_with_corrupt_symbols.size()); | |
| frames = call_stack.frames(); | |
| ASSERT_EQ(1U, frames->size()); | |
| StackFrameARM *frame = static_cast<StackFrameARM*>(frames->at(0)); | |
| // Check that the values from the original raw context made it | |
| // through to the context in the stack frame. | |
| EXPECT_EQ(0, memcmp(&raw_context, &frame->context, sizeof(raw_context))); | |
| } | |
| class GetCallerFrame: public StackwalkerARMFixture, public Test { }; | |
| TEST_F(GetCallerFrame, ScanWithoutSymbols) { | |
| // When the stack walker resorts to scanning the stack, | |
| // only addresses located within loaded modules are | |
| // considered valid return addresses. | |
| // Force scanning through three frames to ensure that the | |
| // stack pointer is set properly in scan-recovered frames. | |
| stack_section.start() = 0x80000000; | |
| uint32_t return_address1 = 0x50000100; | |
| uint32_t return_address2 = 0x50000900; | |
| Label frame1_sp, frame2_sp; | |
| stack_section | |
| // frame 0 | |
| .Append(16, 0) // space | |
| .D32(0x40090000) // junk that's not | |
| .D32(0x60000000) // a return address | |
| .D32(return_address1) // actual return address | |
| // frame 1 | |
| .Mark(&frame1_sp) | |
| .Append(16, 0) // space | |
| .D32(0xF0000000) // more junk | |
| .D32(0x0000000D) | |
| .D32(return_address2) // actual return address | |
| // frame 2 | |
| .Mark(&frame2_sp) | |
| .Append(32, 0); // end of stack | |
| RegionFromSection(); | |
| raw_context.iregs[MD_CONTEXT_ARM_REG_PC] = 0x40005510; | |
| raw_context.iregs[MD_CONTEXT_ARM_REG_SP] = stack_section.start().Value(); | |
| StackFrameSymbolizer frame_symbolizer(&supplier, &resolver); | |
| StackwalkerARM walker(&system_info, &raw_context, -1, &stack_region, &modules, | |
| &frame_symbolizer); | |
| vector<const CodeModule*> modules_without_symbols; | |
| vector<const CodeModule*> modules_with_corrupt_symbols; | |
| ASSERT_TRUE(walker.Walk(&call_stack, &modules_without_symbols, | |
| &modules_with_corrupt_symbols)); | |
| ASSERT_EQ(2U, modules_without_symbols.size()); | |
| ASSERT_EQ("module1", modules_without_symbols[0]->debug_file()); | |
| ASSERT_EQ("module2", modules_without_symbols[1]->debug_file()); | |
| ASSERT_EQ(0U, modules_with_corrupt_symbols.size()); | |
| frames = call_stack.frames(); | |
| ASSERT_EQ(3U, frames->size()); | |
| StackFrameARM *frame0 = static_cast<StackFrameARM*>(frames->at(0)); | |
| EXPECT_EQ(StackFrame::FRAME_TRUST_CONTEXT, frame0->trust); | |
| ASSERT_EQ(StackFrameARM::CONTEXT_VALID_ALL, frame0->context_validity); | |
| EXPECT_EQ(0, memcmp(&raw_context, &frame0->context, sizeof(raw_context))); | |
| StackFrameARM *frame1 = static_cast<StackFrameARM*>(frames->at(1)); | |
| EXPECT_EQ(StackFrame::FRAME_TRUST_SCAN, frame1->trust); | |
| ASSERT_EQ((StackFrameARM::CONTEXT_VALID_PC | | |
| StackFrameARM::CONTEXT_VALID_SP), | |
| frame1->context_validity); | |
| EXPECT_EQ(return_address1, frame1->context.iregs[MD_CONTEXT_ARM_REG_PC]); | |
| EXPECT_EQ(frame1_sp.Value(), frame1->context.iregs[MD_CONTEXT_ARM_REG_SP]); | |
| StackFrameARM *frame2 = static_cast<StackFrameARM*>(frames->at(2)); | |
| EXPECT_EQ(StackFrame::FRAME_TRUST_SCAN, frame2->trust); | |
| ASSERT_EQ((StackFrameARM::CONTEXT_VALID_PC | | |
| StackFrameARM::CONTEXT_VALID_SP), | |
| frame2->context_validity); | |
| EXPECT_EQ(return_address2, frame2->context.iregs[MD_CONTEXT_ARM_REG_PC]); | |
| EXPECT_EQ(frame2_sp.Value(), frame2->context.iregs[MD_CONTEXT_ARM_REG_SP]); | |
| } | |
| TEST_F(GetCallerFrame, ScanWithFunctionSymbols) { | |
| // During stack scanning, if a potential return address | |
| // is located within a loaded module that has symbols, | |
| // it is only considered a valid return address if it | |
| // lies within a function's bounds. | |
| stack_section.start() = 0x80000000; | |
| uint32_t return_address = 0x50000200; | |
| Label frame1_sp; | |
| stack_section | |
| // frame 0 | |
| .Append(16, 0) // space | |
| .D32(0x40090000) // junk that's not | |
| .D32(0x60000000) // a return address | |
| .D32(0x40001000) // a couple of plausible addresses | |
| .D32(0x5000F000) // that are not within functions | |
| .D32(return_address) // actual return address | |
| // frame 1 | |
| .Mark(&frame1_sp) | |
| .Append(32, 0); // end of stack | |
| RegionFromSection(); | |
| raw_context.iregs[MD_CONTEXT_ARM_REG_PC] = 0x40000200; | |
| raw_context.iregs[MD_CONTEXT_ARM_REG_SP] = stack_section.start().Value(); | |
| SetModuleSymbols(&module1, | |
| // The youngest frame's function. | |
| "FUNC 100 400 10 monotreme\n"); | |
| SetModuleSymbols(&module2, | |
| // The calling frame's function. | |
| "FUNC 100 400 10 marsupial\n"); | |
| StackFrameSymbolizer frame_symbolizer(&supplier, &resolver); | |
| StackwalkerARM walker(&system_info, &raw_context, -1, &stack_region, &modules, | |
| &frame_symbolizer); | |
| vector<const CodeModule*> modules_without_symbols; | |
| vector<const CodeModule*> modules_with_corrupt_symbols; | |
| ASSERT_TRUE(walker.Walk(&call_stack, &modules_without_symbols, | |
| &modules_with_corrupt_symbols)); | |
| ASSERT_EQ(0U, modules_without_symbols.size()); | |
| ASSERT_EQ(0U, modules_with_corrupt_symbols.size()); | |
| frames = call_stack.frames(); | |
| ASSERT_EQ(2U, frames->size()); | |
| StackFrameARM *frame0 = static_cast<StackFrameARM*>(frames->at(0)); | |
| EXPECT_EQ(StackFrame::FRAME_TRUST_CONTEXT, frame0->trust); | |
| ASSERT_EQ(StackFrameARM::CONTEXT_VALID_ALL, frame0->context_validity); | |
| EXPECT_EQ(0, memcmp(&raw_context, &frame0->context, sizeof(raw_context))); | |
| EXPECT_EQ("monotreme", frame0->function_name); | |
| EXPECT_EQ(0x40000100U, frame0->function_base); | |
| StackFrameARM *frame1 = static_cast<StackFrameARM*>(frames->at(1)); | |
| EXPECT_EQ(StackFrame::FRAME_TRUST_SCAN, frame1->trust); | |
| ASSERT_EQ((StackFrameARM::CONTEXT_VALID_PC | | |
| StackFrameARM::CONTEXT_VALID_SP), | |
| frame1->context_validity); | |
| EXPECT_EQ(return_address, frame1->context.iregs[MD_CONTEXT_ARM_REG_PC]); | |
| EXPECT_EQ(frame1_sp.Value(), frame1->context.iregs[MD_CONTEXT_ARM_REG_SP]); | |
| EXPECT_EQ("marsupial", frame1->function_name); | |
| EXPECT_EQ(0x50000100U, frame1->function_base); | |
| } | |
| TEST_F(GetCallerFrame, ScanFirstFrame) { | |
| // If the stackwalker resorts to stack scanning, it will scan much | |
| // farther to find the caller of the context frame. | |
| stack_section.start() = 0x80000000; | |
| uint32_t return_address1 = 0x50000100; | |
| uint32_t return_address2 = 0x50000900; | |
| Label frame1_sp, frame2_sp; | |
| stack_section | |
| // frame 0 | |
| .Append(32, 0) // space | |
| .D32(0x40090000) // junk that's not | |
| .D32(0x60000000) // a return address | |
| .Append(96, 0) // more space | |
| .D32(return_address1) // actual return address | |
| // frame 1 | |
| .Mark(&frame1_sp) | |
| .Append(32, 0) // space | |
| .D32(0xF0000000) // more junk | |
| .D32(0x0000000D) | |
| .Append(136, 0) // more space | |
| .D32(return_address2) // actual return address | |
| // (won't be found) | |
| // frame 2 | |
| .Mark(&frame2_sp) | |
| .Append(32, 0); // end of stack | |
| RegionFromSection(); | |
| raw_context.iregs[MD_CONTEXT_ARM_REG_PC] = 0x40005510; | |
| raw_context.iregs[MD_CONTEXT_ARM_REG_SP] = stack_section.start().Value(); | |
| StackFrameSymbolizer frame_symbolizer(&supplier, &resolver); | |
| StackwalkerARM walker(&system_info, &raw_context, -1, &stack_region, &modules, | |
| &frame_symbolizer); | |
| vector<const CodeModule*> modules_without_symbols; | |
| vector<const CodeModule*> modules_with_corrupt_symbols; | |
| ASSERT_TRUE(walker.Walk(&call_stack, &modules_without_symbols, | |
| &modules_with_corrupt_symbols)); | |
| ASSERT_EQ(2U, modules_without_symbols.size()); | |
| ASSERT_EQ("module1", modules_without_symbols[0]->debug_file()); | |
| ASSERT_EQ("module2", modules_without_symbols[1]->debug_file()); | |
| ASSERT_EQ(0U, modules_with_corrupt_symbols.size()); | |
| frames = call_stack.frames(); | |
| ASSERT_EQ(2U, frames->size()); | |
| StackFrameARM *frame0 = static_cast<StackFrameARM*>(frames->at(0)); | |
| EXPECT_EQ(StackFrame::FRAME_TRUST_CONTEXT, frame0->trust); | |
| ASSERT_EQ(StackFrameARM::CONTEXT_VALID_ALL, frame0->context_validity); | |
| EXPECT_EQ(0, memcmp(&raw_context, &frame0->context, sizeof(raw_context))); | |
| StackFrameARM *frame1 = static_cast<StackFrameARM*>(frames->at(1)); | |
| EXPECT_EQ(StackFrame::FRAME_TRUST_SCAN, frame1->trust); | |
| ASSERT_EQ((StackFrameARM::CONTEXT_VALID_PC | | |
| StackFrameARM::CONTEXT_VALID_SP), | |
| frame1->context_validity); | |
| EXPECT_EQ(return_address1, frame1->context.iregs[MD_CONTEXT_ARM_REG_PC]); | |
| EXPECT_EQ(frame1_sp.Value(), frame1->context.iregs[MD_CONTEXT_ARM_REG_SP]); | |
| } | |
| // Test that set_max_frames_scanned prevents using stack scanning | |
| // to find caller frames. | |
| TEST_F(GetCallerFrame, ScanningNotAllowed) { | |
| // When the stack walker resorts to scanning the stack, | |
| // only addresses located within loaded modules are | |
| // considered valid return addresses. | |
| stack_section.start() = 0x80000000; | |
| uint32_t return_address1 = 0x50000100; | |
| uint32_t return_address2 = 0x50000900; | |
| Label frame1_sp, frame2_sp; | |
| stack_section | |
| // frame 0 | |
| .Append(16, 0) // space | |
| .D32(0x40090000) // junk that's not | |
| .D32(0x60000000) // a return address | |
| .D32(return_address1) // actual return address | |
| // frame 1 | |
| .Mark(&frame1_sp) | |
| .Append(16, 0) // space | |
| .D32(0xF0000000) // more junk | |
| .D32(0x0000000D) | |
| .D32(return_address2) // actual return address | |
| // frame 2 | |
| .Mark(&frame2_sp) | |
| .Append(32, 0); // end of stack | |
| RegionFromSection(); | |
| raw_context.iregs[MD_CONTEXT_ARM_REG_PC] = 0x40005510; | |
| raw_context.iregs[MD_CONTEXT_ARM_REG_SP] = stack_section.start().Value(); | |
| StackFrameSymbolizer frame_symbolizer(&supplier, &resolver); | |
| StackwalkerARM walker(&system_info, &raw_context, -1, &stack_region, &modules, | |
| &frame_symbolizer); | |
| Stackwalker::set_max_frames_scanned(0); | |
| vector<const CodeModule*> modules_without_symbols; | |
| vector<const CodeModule*> modules_with_corrupt_symbols; | |
| ASSERT_TRUE(walker.Walk(&call_stack, &modules_without_symbols, | |
| &modules_with_corrupt_symbols)); | |
| ASSERT_EQ(1U, modules_without_symbols.size()); | |
| ASSERT_EQ("module1", modules_without_symbols[0]->debug_file()); | |
| ASSERT_EQ(0U, modules_with_corrupt_symbols.size()); | |
| frames = call_stack.frames(); | |
| ASSERT_EQ(1U, frames->size()); | |
| StackFrameARM *frame0 = static_cast<StackFrameARM*>(frames->at(0)); | |
| EXPECT_EQ(StackFrame::FRAME_TRUST_CONTEXT, frame0->trust); | |
| ASSERT_EQ(StackFrameARM::CONTEXT_VALID_ALL, frame0->context_validity); | |
| EXPECT_EQ(0, memcmp(&raw_context, &frame0->context, sizeof(raw_context))); | |
| } | |
| struct CFIFixture: public StackwalkerARMFixture { | |
| CFIFixture() { | |
| // Provide a bunch of STACK CFI records; we'll walk to the caller | |
| // from every point in this series, expecting to find the same set | |
| // of register values. | |
| SetModuleSymbols(&module1, | |
| // The youngest frame's function. | |
| "FUNC 4000 1000 10 enchiridion\n" | |
| // Initially, nothing has been pushed on the stack, | |
| // and the return address is still in the link register. | |
| "STACK CFI INIT 4000 100 .cfa: sp .ra: lr\n" | |
| // Push r4, the frame pointer, and the link register. | |
| "STACK CFI 4001 .cfa: sp 12 + r4: .cfa 12 - ^" | |
| " r11: .cfa 8 - ^ .ra: .cfa 4 - ^\n" | |
| // Save r4..r7 in r0..r3: verify that we populate | |
| // the youngest frame with all the values we have. | |
| "STACK CFI 4002 r4: r0 r5: r1 r6: r2 r7: r3\n" | |
| // Restore r4..r7. Save the non-callee-saves register r1. | |
| "STACK CFI 4003 .cfa: sp 16 + r1: .cfa 16 - ^" | |
| " r4: r4 r5: r5 r6: r6 r7: r7\n" | |
| // Move the .cfa back four bytes, to point at the return | |
| // address, and restore the sp explicitly. | |
| "STACK CFI 4005 .cfa: sp 12 + r1: .cfa 12 - ^" | |
| " r11: .cfa 4 - ^ .ra: .cfa ^ sp: .cfa 4 +\n" | |
| // Recover the PC explicitly from a new stack slot; | |
| // provide garbage for the .ra. | |
| "STACK CFI 4006 .cfa: sp 16 + pc: .cfa 16 - ^\n" | |
| // The calling function. | |
| "FUNC 5000 1000 10 epictetus\n" | |
| // Mark it as end of stack. | |
| "STACK CFI INIT 5000 1000 .cfa: 0 .ra: 0\n" | |
| // A function whose CFI makes the stack pointer | |
| // go backwards. | |
| "FUNC 6000 1000 20 palinal\n" | |
| "STACK CFI INIT 6000 1000 .cfa: sp 4 - .ra: lr\n" | |
| // A function with CFI expressions that can't be | |
| // evaluated. | |
| "FUNC 7000 1000 20 rhetorical\n" | |
| "STACK CFI INIT 7000 1000 .cfa: moot .ra: ambiguous\n"); | |
| // Provide some distinctive values for the caller's registers. | |
| expected.iregs[MD_CONTEXT_ARM_REG_PC] = 0x40005510; | |
| expected.iregs[MD_CONTEXT_ARM_REG_SP] = 0x80000000; | |
| expected.iregs[4] = 0xb5d55e68; | |
| expected.iregs[5] = 0xebd134f3; | |
| expected.iregs[6] = 0xa31e74bc; | |
| expected.iregs[7] = 0x2dcb16b3; | |
| expected.iregs[8] = 0x2ada2137; | |
| expected.iregs[9] = 0xbbbb557d; | |
| expected.iregs[10] = 0x48bf8ca7; | |
| expected.iregs[MD_CONTEXT_ARM_REG_FP] = 0x8112e110; | |
| // Expect CFI to recover all callee-saves registers. Since CFI is the | |
| // only stack frame construction technique we have, aside from the | |
| // context frame itself, there's no way for us to have a set of valid | |
| // registers smaller than this. | |
| expected_validity = (StackFrameARM::CONTEXT_VALID_PC | | |
| StackFrameARM::CONTEXT_VALID_SP | | |
| StackFrameARM::CONTEXT_VALID_R4 | | |
| StackFrameARM::CONTEXT_VALID_R5 | | |
| StackFrameARM::CONTEXT_VALID_R6 | | |
| StackFrameARM::CONTEXT_VALID_R7 | | |
| StackFrameARM::CONTEXT_VALID_R8 | | |
| StackFrameARM::CONTEXT_VALID_R9 | | |
| StackFrameARM::CONTEXT_VALID_R10 | | |
| StackFrameARM::CONTEXT_VALID_FP); | |
| // By default, context frames provide all registers, as normal. | |
| context_frame_validity = StackFrameARM::CONTEXT_VALID_ALL; | |
| // By default, registers are unchanged. | |
| raw_context = expected; | |
| } | |
| // Walk the stack, using stack_section as the contents of the stack | |
| // and raw_context as the current register values. (Set the stack | |
| // pointer to the stack's starting address.) Expect two stack | |
| // frames; in the older frame, expect the callee-saves registers to | |
| // have values matching those in 'expected'. | |
| void CheckWalk() { | |
| RegionFromSection(); | |
| raw_context.iregs[MD_CONTEXT_ARM_REG_SP] = stack_section.start().Value(); | |
| StackFrameSymbolizer frame_symbolizer(&supplier, &resolver); | |
| StackwalkerARM walker(&system_info, &raw_context, -1, &stack_region, | |
| &modules, &frame_symbolizer); | |
| walker.SetContextFrameValidity(context_frame_validity); | |
| vector<const CodeModule*> modules_without_symbols; | |
| vector<const CodeModule*> modules_with_corrupt_symbols; | |
| ASSERT_TRUE(walker.Walk(&call_stack, &modules_without_symbols, | |
| &modules_with_corrupt_symbols)); | |
| ASSERT_EQ(0U, modules_without_symbols.size()); | |
| ASSERT_EQ(0U, modules_with_corrupt_symbols.size()); | |
| frames = call_stack.frames(); | |
| ASSERT_EQ(2U, frames->size()); | |
| StackFrameARM *frame0 = static_cast<StackFrameARM*>(frames->at(0)); | |
| EXPECT_EQ(StackFrame::FRAME_TRUST_CONTEXT, frame0->trust); | |
| ASSERT_EQ(context_frame_validity, frame0->context_validity); | |
| EXPECT_EQ("enchiridion", frame0->function_name); | |
| EXPECT_EQ(0x40004000U, frame0->function_base); | |
| StackFrameARM *frame1 = static_cast<StackFrameARM*>(frames->at(1)); | |
| EXPECT_EQ(StackFrame::FRAME_TRUST_CFI, frame1->trust); | |
| ASSERT_EQ(expected_validity, frame1->context_validity); | |
| if (expected_validity & StackFrameARM::CONTEXT_VALID_R1) | |
| EXPECT_EQ(expected.iregs[1], frame1->context.iregs[1]); | |
| if (expected_validity & StackFrameARM::CONTEXT_VALID_R4) | |
| EXPECT_EQ(expected.iregs[4], frame1->context.iregs[4]); | |
| if (expected_validity & StackFrameARM::CONTEXT_VALID_R5) | |
| EXPECT_EQ(expected.iregs[5], frame1->context.iregs[5]); | |
| if (expected_validity & StackFrameARM::CONTEXT_VALID_R6) | |
| EXPECT_EQ(expected.iregs[6], frame1->context.iregs[6]); | |
| if (expected_validity & StackFrameARM::CONTEXT_VALID_R7) | |
| EXPECT_EQ(expected.iregs[7], frame1->context.iregs[7]); | |
| if (expected_validity & StackFrameARM::CONTEXT_VALID_R8) | |
| EXPECT_EQ(expected.iregs[8], frame1->context.iregs[8]); | |
| if (expected_validity & StackFrameARM::CONTEXT_VALID_R9) | |
| EXPECT_EQ(expected.iregs[9], frame1->context.iregs[9]); | |
| if (expected_validity & StackFrameARM::CONTEXT_VALID_R10) | |
| EXPECT_EQ(expected.iregs[10], frame1->context.iregs[10]); | |
| if (expected_validity & StackFrameARM::CONTEXT_VALID_FP) | |
| EXPECT_EQ(expected.iregs[MD_CONTEXT_ARM_REG_FP], | |
| frame1->context.iregs[MD_CONTEXT_ARM_REG_FP]); | |
| // We would never have gotten a frame in the first place if the SP | |
| // and PC weren't valid or ->instruction weren't set. | |
| EXPECT_EQ(expected.iregs[MD_CONTEXT_ARM_REG_SP], | |
| frame1->context.iregs[MD_CONTEXT_ARM_REG_SP]); | |
| EXPECT_EQ(expected.iregs[MD_CONTEXT_ARM_REG_PC], | |
| frame1->context.iregs[MD_CONTEXT_ARM_REG_PC]); | |
| EXPECT_EQ(expected.iregs[MD_CONTEXT_ARM_REG_PC], | |
| frame1->instruction + 2); | |
| EXPECT_EQ("epictetus", frame1->function_name); | |
| } | |
| // The values we expect to find for the caller's registers. | |
| MDRawContextARM expected; | |
| // The validity mask for expected. | |
| int expected_validity; | |
| // The validity mask to impose on the context frame. | |
| int context_frame_validity; | |
| }; | |
| class CFI: public CFIFixture, public Test { }; | |
| TEST_F(CFI, At4000) { | |
| stack_section.start() = expected.iregs[MD_CONTEXT_ARM_REG_SP]; | |
| raw_context.iregs[MD_CONTEXT_ARM_REG_PC] = 0x40004000; | |
| raw_context.iregs[MD_CONTEXT_ARM_REG_LR] = 0x40005510; | |
| CheckWalk(); | |
| } | |
| TEST_F(CFI, At4001) { | |
| Label frame1_sp = expected.iregs[MD_CONTEXT_ARM_REG_SP]; | |
| stack_section | |
| .D32(0xb5d55e68) // saved r4 | |
| .D32(0x8112e110) // saved fp | |
| .D32(0x40005510) // return address | |
| .Mark(&frame1_sp); // This effectively sets stack_section.start(). | |
| raw_context.iregs[MD_CONTEXT_ARM_REG_PC] = 0x40004001; | |
| raw_context.iregs[4] = 0x635adc9f; // distinct callee r4 | |
| raw_context.iregs[MD_CONTEXT_ARM_REG_FP] = 0xbe145fc4; // distinct callee fp | |
| CheckWalk(); | |
| } | |
| // As above, but unwind from a context that has only the PC and SP. | |
| TEST_F(CFI, At4001LimitedValidity) { | |
| context_frame_validity = | |
| StackFrameARM::CONTEXT_VALID_PC | StackFrameARM::CONTEXT_VALID_SP; | |
| raw_context.iregs[MD_CONTEXT_ARM_REG_PC] = 0x40004001; | |
| raw_context.iregs[MD_CONTEXT_ARM_REG_FP] = 0xbe145fc4; // distinct callee fp | |
| Label frame1_sp = expected.iregs[MD_CONTEXT_ARM_REG_SP]; | |
| stack_section | |
| .D32(0xb5d55e68) // saved r4 | |
| .D32(0x8112e110) // saved fp | |
| .D32(0x40005510) // return address | |
| .Mark(&frame1_sp); // This effectively sets stack_section.start(). | |
| expected_validity = (StackFrameARM::CONTEXT_VALID_PC | |
| | StackFrameARM::CONTEXT_VALID_SP | |
| | StackFrameARM::CONTEXT_VALID_FP | |
| | StackFrameARM::CONTEXT_VALID_R4); | |
| CheckWalk(); | |
| } | |
| TEST_F(CFI, At4002) { | |
| Label frame1_sp = expected.iregs[MD_CONTEXT_ARM_REG_SP]; | |
| stack_section | |
| .D32(0xfb81ff3d) // no longer saved r4 | |
| .D32(0x8112e110) // saved fp | |
| .D32(0x40005510) // return address | |
| .Mark(&frame1_sp); // This effectively sets stack_section.start(). | |
| raw_context.iregs[MD_CONTEXT_ARM_REG_PC] = 0x40004002; | |
| raw_context.iregs[0] = 0xb5d55e68; // saved r4 | |
| raw_context.iregs[1] = 0xebd134f3; // saved r5 | |
| raw_context.iregs[2] = 0xa31e74bc; // saved r6 | |
| raw_context.iregs[3] = 0x2dcb16b3; // saved r7 | |
| raw_context.iregs[4] = 0xfdd35466; // distinct callee r4 | |
| raw_context.iregs[5] = 0xf18c946c; // distinct callee r5 | |
| raw_context.iregs[6] = 0xac2079e8; // distinct callee r6 | |
| raw_context.iregs[7] = 0xa449829f; // distinct callee r7 | |
| raw_context.iregs[MD_CONTEXT_ARM_REG_FP] = 0xbe145fc4; // distinct callee fp | |
| CheckWalk(); | |
| } | |
| TEST_F(CFI, At4003) { | |
| Label frame1_sp = expected.iregs[MD_CONTEXT_ARM_REG_SP]; | |
| stack_section | |
| .D32(0x48c8dd5a) // saved r1 (even though it's not callee-saves) | |
| .D32(0xcb78040e) // no longer saved r4 | |
| .D32(0x8112e110) // saved fp | |
| .D32(0x40005510) // return address | |
| .Mark(&frame1_sp); // This effectively sets stack_section.start(). | |
| raw_context.iregs[MD_CONTEXT_ARM_REG_PC] = 0x40004003; | |
| raw_context.iregs[1] = 0xfb756319; // distinct callee r1 | |
| raw_context.iregs[MD_CONTEXT_ARM_REG_FP] = 0x0a2857ea; // distinct callee fp | |
| expected.iregs[1] = 0x48c8dd5a; // caller's r1 | |
| expected_validity |= StackFrameARM::CONTEXT_VALID_R1; | |
| CheckWalk(); | |
| } | |
| // We have no new rule at module offset 0x4004, so the results here should | |
| // be the same as those at module offset 0x4003. | |
| TEST_F(CFI, At4004) { | |
| Label frame1_sp = expected.iregs[MD_CONTEXT_ARM_REG_SP]; | |
| stack_section | |
| .D32(0x48c8dd5a) // saved r1 (even though it's not callee-saves) | |
| .D32(0xcb78040e) // no longer saved r4 | |
| .D32(0x8112e110) // saved fp | |
| .D32(0x40005510) // return address | |
| .Mark(&frame1_sp); // This effectively sets stack_section.start(). | |
| raw_context.iregs[MD_CONTEXT_ARM_REG_PC] = 0x40004004; | |
| raw_context.iregs[1] = 0xfb756319; // distinct callee r1 | |
| expected.iregs[1] = 0x48c8dd5a; // caller's r1 | |
| expected_validity |= StackFrameARM::CONTEXT_VALID_R1; | |
| CheckWalk(); | |
| } | |
| // Here we move the .cfa, but provide an explicit rule to recover the SP, | |
| // so again there should be no change in the registers recovered. | |
| TEST_F(CFI, At4005) { | |
| Label frame1_sp = expected.iregs[MD_CONTEXT_ARM_REG_SP]; | |
| stack_section | |
| .D32(0x48c8dd5a) // saved r1 (even though it's not callee-saves) | |
| .D32(0xf013f841) // no longer saved r4 | |
| .D32(0x8112e110) // saved fp | |
| .D32(0x40005510) // return address | |
| .Mark(&frame1_sp); // This effectively sets stack_section.start(). | |
| raw_context.iregs[MD_CONTEXT_ARM_REG_PC] = 0x40004005; | |
| raw_context.iregs[1] = 0xfb756319; // distinct callee r1 | |
| expected.iregs[1] = 0x48c8dd5a; // caller's r1 | |
| expected_validity |= StackFrameARM::CONTEXT_VALID_R1; | |
| CheckWalk(); | |
| } | |
| // Here we provide an explicit rule for the PC, and have the saved .ra be | |
| // bogus. | |
| TEST_F(CFI, At4006) { | |
| Label frame1_sp = expected.iregs[MD_CONTEXT_ARM_REG_SP]; | |
| stack_section | |
| .D32(0x40005510) // saved pc | |
| .D32(0x48c8dd5a) // saved r1 (even though it's not callee-saves) | |
| .D32(0xf013f841) // no longer saved r4 | |
| .D32(0x8112e110) // saved fp | |
| .D32(0xf8d15783) // .ra rule recovers this, which is garbage | |
| .Mark(&frame1_sp); // This effectively sets stack_section.start(). | |
| raw_context.iregs[MD_CONTEXT_ARM_REG_PC] = 0x40004006; | |
| raw_context.iregs[1] = 0xfb756319; // callee's r1, different from caller's | |
| expected.iregs[1] = 0x48c8dd5a; // caller's r1 | |
| expected_validity |= StackFrameARM::CONTEXT_VALID_R1; | |
| CheckWalk(); | |
| } | |
| // Check that we reject rules that would cause the stack pointer to | |
| // move in the wrong direction. | |
| TEST_F(CFI, RejectBackwards) { | |
| raw_context.iregs[MD_CONTEXT_ARM_REG_PC] = 0x40006000; | |
| raw_context.iregs[MD_CONTEXT_ARM_REG_SP] = 0x80000000; | |
| raw_context.iregs[MD_CONTEXT_ARM_REG_LR] = 0x40005510; | |
| StackFrameSymbolizer frame_symbolizer(&supplier, &resolver); | |
| StackwalkerARM walker(&system_info, &raw_context, -1, &stack_region, &modules, | |
| &frame_symbolizer); | |
| vector<const CodeModule*> modules_without_symbols; | |
| vector<const CodeModule*> modules_with_corrupt_symbols; | |
| ASSERT_TRUE(walker.Walk(&call_stack, &modules_without_symbols, | |
| &modules_with_corrupt_symbols)); | |
| ASSERT_EQ(0U, modules_without_symbols.size()); | |
| ASSERT_EQ(0U, modules_with_corrupt_symbols.size()); | |
| frames = call_stack.frames(); | |
| ASSERT_EQ(1U, frames->size()); | |
| } | |
| // Check that we reject rules whose expressions' evaluation fails. | |
| TEST_F(CFI, RejectBadExpressions) { | |
| raw_context.iregs[MD_CONTEXT_ARM_REG_PC] = 0x40007000; | |
| raw_context.iregs[MD_CONTEXT_ARM_REG_SP] = 0x80000000; | |
| StackFrameSymbolizer frame_symbolizer(&supplier, &resolver); | |
| StackwalkerARM walker(&system_info, &raw_context, -1, &stack_region, &modules, | |
| &frame_symbolizer); | |
| vector<const CodeModule*> modules_without_symbols; | |
| vector<const CodeModule*> modules_with_corrupt_symbols; | |
| ASSERT_TRUE(walker.Walk(&call_stack, &modules_without_symbols, | |
| &modules_with_corrupt_symbols)); | |
| ASSERT_EQ(0U, modules_without_symbols.size()); | |
| ASSERT_EQ(0U, modules_with_corrupt_symbols.size()); | |
| frames = call_stack.frames(); | |
| ASSERT_EQ(1U, frames->size()); | |
| } | |
| class StackwalkerARMFixtureIOS : public StackwalkerARMFixture { | |
| public: | |
| StackwalkerARMFixtureIOS() { | |
| // iOS_test is used instead of iOS because the stackwalker has a check to | |
| // avoid using CFI for iOS dumps. This is a workaround for bad CFI being | |
| // produced by dump_syms for iOS. | |
| // https://bugs.chromium.org/p/google-breakpad/issues/detail?id=764 | |
| system_info.os = "iOS_test"; | |
| system_info.os_short = "ios_test"; | |
| } | |
| }; | |
| class GetFramesByFramePointer: public StackwalkerARMFixtureIOS, public Test { }; | |
| TEST_F(GetFramesByFramePointer, OnlyFramePointer) { | |
| stack_section.start() = 0x80000000; | |
| uint32_t return_address1 = 0x50000100; | |
| uint32_t return_address2 = 0x50000900; | |
| Label frame1_sp, frame2_sp; | |
| Label frame1_fp, frame2_fp; | |
| stack_section | |
| // frame 0 | |
| .Append(32, 0) // Whatever values on the stack. | |
| .D32(0x0000000D) // junk that's not | |
| .D32(0xF0000000) // a return address. | |
| .Mark(&frame1_fp) // Next fp will point to the next value. | |
| .D32(frame2_fp) // Save current frame pointer. | |
| .D32(return_address2) // Save current link register. | |
| .Mark(&frame1_sp) | |
| // frame 1 | |
| .Append(32, 0) // Whatever values on the stack. | |
| .D32(0x0000000D) // junk that's not | |
| .D32(0xF0000000) // a return address. | |
| .Mark(&frame2_fp) | |
| .D32(0) | |
| .D32(0) | |
| .Mark(&frame2_sp) | |
| // frame 2 | |
| .Append(32, 0) // Whatever values on the stack. | |
| .D32(0x0000000D) // junk that's not | |
| .D32(0xF0000000); // a return address. | |
| RegionFromSection(); | |
| raw_context.iregs[MD_CONTEXT_ARM_REG_PC] = 0x40005510; | |
| raw_context.iregs[MD_CONTEXT_ARM_REG_LR] = return_address1; | |
| raw_context.iregs[MD_CONTEXT_ARM_REG_IOS_FP] = frame1_fp.Value(); | |
| raw_context.iregs[MD_CONTEXT_ARM_REG_SP] = stack_section.start().Value(); | |
| StackFrameSymbolizer frame_symbolizer(&supplier, &resolver); | |
| StackwalkerARM walker(&system_info, &raw_context, MD_CONTEXT_ARM_REG_IOS_FP, | |
| &stack_region, &modules, &frame_symbolizer); | |
| vector<const CodeModule*> modules_without_symbols; | |
| vector<const CodeModule*> modules_with_corrupt_symbols; | |
| ASSERT_TRUE(walker.Walk(&call_stack, &modules_without_symbols, | |
| &modules_with_corrupt_symbols)); | |
| ASSERT_EQ(2U, modules_without_symbols.size()); | |
| ASSERT_EQ("module1", modules_without_symbols[0]->debug_file()); | |
| ASSERT_EQ("module2", modules_without_symbols[1]->debug_file()); | |
| ASSERT_EQ(0U, modules_with_corrupt_symbols.size()); | |
| frames = call_stack.frames(); | |
| ASSERT_EQ(3U, frames->size()); | |
| StackFrameARM *frame0 = static_cast<StackFrameARM*>(frames->at(0)); | |
| EXPECT_EQ(StackFrame::FRAME_TRUST_CONTEXT, frame0->trust); | |
| ASSERT_EQ(StackFrameARM::CONTEXT_VALID_ALL, frame0->context_validity); | |
| EXPECT_EQ(0, memcmp(&raw_context, &frame0->context, sizeof(raw_context))); | |
| StackFrameARM *frame1 = static_cast<StackFrameARM*>(frames->at(1)); | |
| EXPECT_EQ(StackFrame::FRAME_TRUST_FP, frame1->trust); | |
| ASSERT_EQ((StackFrameARM::CONTEXT_VALID_PC | | |
| StackFrameARM::CONTEXT_VALID_LR | | |
| StackFrameARM::RegisterValidFlag(MD_CONTEXT_ARM_REG_IOS_FP) | | |
| StackFrameARM::CONTEXT_VALID_SP), | |
| frame1->context_validity); | |
| EXPECT_EQ(return_address1, frame1->context.iregs[MD_CONTEXT_ARM_REG_PC]); | |
| EXPECT_EQ(return_address2, frame1->context.iregs[MD_CONTEXT_ARM_REG_LR]); | |
| EXPECT_EQ(frame1_sp.Value(), frame1->context.iregs[MD_CONTEXT_ARM_REG_SP]); | |
| EXPECT_EQ(frame2_fp.Value(), | |
| frame1->context.iregs[MD_CONTEXT_ARM_REG_IOS_FP]); | |
| StackFrameARM *frame2 = static_cast<StackFrameARM*>(frames->at(2)); | |
| EXPECT_EQ(StackFrame::FRAME_TRUST_FP, frame2->trust); | |
| ASSERT_EQ((StackFrameARM::CONTEXT_VALID_PC | | |
| StackFrameARM::CONTEXT_VALID_LR | | |
| StackFrameARM::RegisterValidFlag(MD_CONTEXT_ARM_REG_IOS_FP) | | |
| StackFrameARM::CONTEXT_VALID_SP), | |
| frame2->context_validity); | |
| EXPECT_EQ(return_address2, frame2->context.iregs[MD_CONTEXT_ARM_REG_PC]); | |
| EXPECT_EQ(0U, frame2->context.iregs[MD_CONTEXT_ARM_REG_LR]); | |
| EXPECT_EQ(frame2_sp.Value(), frame2->context.iregs[MD_CONTEXT_ARM_REG_SP]); | |
| EXPECT_EQ(0U, frame2->context.iregs[MD_CONTEXT_ARM_REG_IOS_FP]); | |
| } | |
| TEST_F(GetFramesByFramePointer, FramePointerAndCFI) { | |
| // Provide the standatd STACK CFI records that is obtained when exmining an | |
| // executable produced by XCode. | |
| SetModuleSymbols(&module1, | |
| // Adding a function in CFI. | |
| "FUNC 4000 1000 10 enchiridion\n" | |
| "STACK CFI INIT 4000 100 .cfa: sp 0 + .ra: lr\n" | |
| "STACK CFI 4001 .cfa: sp 8 + .ra: .cfa -4 + ^" | |
| " r7: .cfa -8 + ^\n" | |
| "STACK CFI 4002 .cfa: r7 8 +\n" | |
| ); | |
| stack_section.start() = 0x80000000; | |
| uint32_t return_address1 = 0x40004010; | |
| uint32_t return_address2 = 0x50000900; | |
| Label frame1_sp, frame2_sp; | |
| Label frame1_fp, frame2_fp; | |
| stack_section | |
| // frame 0 | |
| .Append(32, 0) // Whatever values on the stack. | |
| .D32(0x0000000D) // junk that's not | |
| .D32(0xF0000000) // a return address. | |
| .Mark(&frame1_fp) // Next fp will point to the next value. | |
| .D32(frame2_fp) // Save current frame pointer. | |
| .D32(return_address2) // Save current link register. | |
| .Mark(&frame1_sp) | |
| // frame 1 | |
| .Append(32, 0) // Whatever values on the stack. | |
| .D32(0x0000000D) // junk that's not | |
| .D32(0xF0000000) // a return address. | |
| .Mark(&frame2_fp) | |
| .D32(0) | |
| .D32(0) | |
| .Mark(&frame2_sp) | |
| // frame 2 | |
| .Append(32, 0) // Whatever values on the stack. | |
| .D32(0x0000000D) // junk that's not | |
| .D32(0xF0000000); // a return address. | |
| RegionFromSection(); | |
| raw_context.iregs[MD_CONTEXT_ARM_REG_PC] = 0x50000400; | |
| raw_context.iregs[MD_CONTEXT_ARM_REG_LR] = return_address1; | |
| raw_context.iregs[MD_CONTEXT_ARM_REG_IOS_FP] = frame1_fp.Value(); | |
| raw_context.iregs[MD_CONTEXT_ARM_REG_SP] = stack_section.start().Value(); | |
| StackFrameSymbolizer frame_symbolizer(&supplier, &resolver); | |
| StackwalkerARM walker(&system_info, &raw_context, MD_CONTEXT_ARM_REG_IOS_FP, | |
| &stack_region, &modules, &frame_symbolizer); | |
| vector<const CodeModule*> modules_without_symbols; | |
| vector<const CodeModule*> modules_with_corrupt_symbols; | |
| ASSERT_TRUE(walker.Walk(&call_stack, &modules_without_symbols, | |
| &modules_with_corrupt_symbols)); | |
| ASSERT_EQ(1U, modules_without_symbols.size()); | |
| ASSERT_EQ("module2", modules_without_symbols[0]->debug_file()); | |
| ASSERT_EQ(0U, modules_with_corrupt_symbols.size()); | |
| frames = call_stack.frames(); | |
| ASSERT_EQ(3U, frames->size()); | |
| StackFrameARM *frame0 = static_cast<StackFrameARM*>(frames->at(0)); | |
| EXPECT_EQ(StackFrame::FRAME_TRUST_CONTEXT, frame0->trust); | |
| ASSERT_EQ(StackFrameARM::CONTEXT_VALID_ALL, frame0->context_validity); | |
| EXPECT_EQ(0, memcmp(&raw_context, &frame0->context, sizeof(raw_context))); | |
| StackFrameARM *frame1 = static_cast<StackFrameARM*>(frames->at(1)); | |
| EXPECT_EQ(StackFrame::FRAME_TRUST_FP, frame1->trust); | |
| ASSERT_EQ((StackFrameARM::CONTEXT_VALID_PC | | |
| StackFrameARM::CONTEXT_VALID_LR | | |
| StackFrameARM::RegisterValidFlag(MD_CONTEXT_ARM_REG_IOS_FP) | | |
| StackFrameARM::CONTEXT_VALID_SP), | |
| frame1->context_validity); | |
| EXPECT_EQ(return_address1, frame1->context.iregs[MD_CONTEXT_ARM_REG_PC]); | |
| EXPECT_EQ(return_address2, frame1->context.iregs[MD_CONTEXT_ARM_REG_LR]); | |
| EXPECT_EQ(frame1_sp.Value(), frame1->context.iregs[MD_CONTEXT_ARM_REG_SP]); | |
| EXPECT_EQ(frame2_fp.Value(), | |
| frame1->context.iregs[MD_CONTEXT_ARM_REG_IOS_FP]); | |
| EXPECT_EQ("enchiridion", frame1->function_name); | |
| EXPECT_EQ(0x40004000U, frame1->function_base); | |
| StackFrameARM *frame2 = static_cast<StackFrameARM*>(frames->at(2)); | |
| EXPECT_EQ(StackFrame::FRAME_TRUST_CFI, frame2->trust); | |
| ASSERT_EQ((StackFrameARM::CONTEXT_VALID_PC | | |
| StackFrameARM::CONTEXT_VALID_LR | | |
| StackFrameARM::RegisterValidFlag(MD_CONTEXT_ARM_REG_IOS_FP) | | |
| StackFrameARM::CONTEXT_VALID_SP), | |
| frame2->context_validity); | |
| EXPECT_EQ(return_address2, frame2->context.iregs[MD_CONTEXT_ARM_REG_PC]); | |
| EXPECT_EQ(0U, frame2->context.iregs[MD_CONTEXT_ARM_REG_LR]); | |
| EXPECT_EQ(frame2_sp.Value(), frame2->context.iregs[MD_CONTEXT_ARM_REG_SP]); | |
| EXPECT_EQ(0U, frame2->context.iregs[MD_CONTEXT_ARM_REG_IOS_FP]); | |
| } |