// 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 // stackwalker_arm_unittest.cc: Unit tests for StackwalkerARM class. #include #include #include #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(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* 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 modules_without_symbols; vector 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(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 modules_without_symbols; vector 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(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 modules_without_symbols; vector 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(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 modules_without_symbols; vector 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(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(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(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 modules_without_symbols; vector 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(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(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 modules_without_symbols; vector 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(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(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 modules_without_symbols; vector 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(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 modules_without_symbols; vector 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(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(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 modules_without_symbols; vector 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 modules_without_symbols; vector 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 modules_without_symbols; vector 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(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(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(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 modules_without_symbols; vector 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(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(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(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]); }