// Copyright (c) 2013, 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: Veljko Mihailovic // stackwalker_mips64_unittest.cc: Unit tests for StackwalkerMIPS class for // mips64 platforms. #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_mips.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::StackFrameMIPS; using google_breakpad::Stackwalker; using google_breakpad::StackwalkerMIPS; 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::Return; using testing::SetArgumentPointee; using testing::Test; class StackwalkerMIPSFixture { public: StackwalkerMIPSFixture() : stack_section(kLittleEndian), // Give the two modules reasonable standard locations and names // for tests to play with. module1(0x00400000, 0x10000, "module1", "version1"), module2(0x00500000, 0x10000, "module2", "version2") { // Identify the system as a Linux system. system_info.os = "Linux"; system_info.os_short = "linux"; system_info.os_version = "Observant Opossum"; // Jealous Jellyfish system_info.cpu = "mips64"; 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(MDRawContextMIPS* 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; MDRawContextMIPS 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 StackwalkerMIPSFixture, public Test { }; TEST_F(SanityCheck, NoResolver) { raw_context.context_flags = raw_context.context_flags | MD_CONTEXT_MIPS64_FULL; stack_section.start() = 0x80000000; stack_section.D64(0).D64(0x0); RegionFromSection(); raw_context.epc = 0x00400020; raw_context.iregs[MD_CONTEXT_MIPS_REG_SP] = 0x80000000; StackFrameSymbolizer frame_symbolizer(NULL, NULL); StackwalkerMIPS walker(&system_info, &raw_context, &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(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()); StackFrameMIPS* 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 StackwalkerMIPSFixture, public Test { }; TEST_F(GetContextFrame, Simple) { raw_context.context_flags = raw_context.context_flags | MD_CONTEXT_MIPS64_FULL; stack_section.start() = 0x80000000; stack_section.D64(0).D64(0x0); RegionFromSection(); raw_context.epc = 0x00400020; raw_context.iregs[MD_CONTEXT_MIPS_REG_SP] = 0x80000000; StackFrameSymbolizer frame_symbolizer(&supplier, &resolver); StackwalkerMIPS walker(&system_info, &raw_context, &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("module1", modules_without_symbols[0]->debug_file()); ASSERT_EQ(0U, modules_with_corrupt_symbols.size()); frames = call_stack.frames(); StackFrameMIPS* 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) { raw_context.context_flags = raw_context.context_flags | MD_CONTEXT_MIPS64_FULL; raw_context.epc = 0x00400020; raw_context.iregs[MD_CONTEXT_MIPS_REG_SP] = 0x80000000; StackFrameSymbolizer frame_symbolizer(&supplier, &resolver); StackwalkerMIPS walker(&system_info, &raw_context, 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(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(); StackFrameMIPS* 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 StackwalkerMIPSFixture, public Test { }; TEST_F(GetCallerFrame, ScanWithoutSymbols) { raw_context.context_flags = raw_context.context_flags | MD_CONTEXT_MIPS64_FULL; // 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; uint64_t return_address1 = 0x00400100; uint64_t return_address2 = 0x00400900; Label frame1_sp, frame2_sp; stack_section // frame 0 .Append(32, 0) // space .D64(0x00490000) // junk that's not .D64(0x00600000) // a return address .D64(frame1_sp) // stack pointer .D64(return_address1) // actual return address // frame 1 .Mark(&frame1_sp) .Append(32, 0) // space .D64(0xF0000000) // more junk .D64(0x0000000D) .D64(frame2_sp) // stack pointer .D64(return_address2) // actual return address // frame 2 .Mark(&frame2_sp) .Append(64, 0); // end of stack RegionFromSection(); raw_context.epc = 0x00405510; raw_context.iregs[MD_CONTEXT_MIPS_REG_SP] = stack_section.start().Value(); raw_context.iregs[MD_CONTEXT_MIPS_REG_RA] = return_address1; StackFrameSymbolizer frame_symbolizer(&supplier, &resolver); StackwalkerMIPS walker(&system_info, &raw_context, &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("module1", modules_without_symbols[0]->debug_file()); ASSERT_EQ(0U, modules_with_corrupt_symbols.size()); frames = call_stack.frames(); ASSERT_EQ(3U, frames->size()); StackFrameMIPS* frame0 = static_cast(frames->at(0)); EXPECT_EQ(StackFrame::FRAME_TRUST_CONTEXT, frame0->trust); ASSERT_EQ(StackFrameMIPS::CONTEXT_VALID_ALL, frame0->context_validity); EXPECT_EQ(0, memcmp(&raw_context, &frame0->context, sizeof(raw_context))); StackFrameMIPS* frame1 = static_cast(frames->at(1)); EXPECT_EQ(StackFrame::FRAME_TRUST_SCAN, frame1->trust); ASSERT_EQ((StackFrameMIPS::CONTEXT_VALID_PC | StackFrameMIPS::CONTEXT_VALID_SP | StackFrameMIPS::CONTEXT_VALID_FP | StackFrameMIPS::CONTEXT_VALID_RA), frame1->context_validity); EXPECT_EQ(return_address1 - 2 * sizeof(return_address1), frame1->context.epc); EXPECT_EQ(frame1_sp.Value(), frame1->context.iregs[MD_CONTEXT_MIPS_REG_SP]); StackFrameMIPS* frame2 = static_cast(frames->at(2)); EXPECT_EQ(StackFrame::FRAME_TRUST_SCAN, frame2->trust); ASSERT_EQ((StackFrameMIPS::CONTEXT_VALID_PC | StackFrameMIPS::CONTEXT_VALID_SP | StackFrameMIPS::CONTEXT_VALID_FP | StackFrameMIPS::CONTEXT_VALID_RA), frame2->context_validity); EXPECT_EQ(return_address2 - 2 * sizeof(return_address2), frame2->context.epc); EXPECT_EQ(frame2_sp.Value(), frame2->context.iregs[MD_CONTEXT_MIPS_REG_SP]); } TEST_F(GetCallerFrame, ScanWithFunctionSymbols) { raw_context.context_flags = raw_context.context_flags | MD_CONTEXT_MIPS64_FULL; // 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; uint64_t return_address = 0x00500200; Label frame1_sp; stack_section // frame 0 .Append(16, 0) // space .D64(0x00490000) // junk that's not .D64(0x00600000) // a return address .D64(0x00401000) // a couple of plausible addresses .D64(0x0050F000) // that are not within functions .D64(frame1_sp) // stack pointer .D64(return_address) // actual return address // frame 1 .Mark(&frame1_sp) .Append(64, 0); // end of stack RegionFromSection(); raw_context.epc = 0x00400200; raw_context.iregs[MD_CONTEXT_MIPS_REG_SP] = stack_section.start().Value(); raw_context.iregs[MD_CONTEXT_MIPS_REG_RA] = return_address; 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); StackwalkerMIPS walker(&system_info, &raw_context, &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()); StackFrameMIPS* frame0 = static_cast(frames->at(0)); EXPECT_EQ(StackFrame::FRAME_TRUST_CONTEXT, frame0->trust); ASSERT_EQ(StackFrameMIPS::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(0x00400100U, frame0->function_base); StackFrameMIPS* frame1 = static_cast(frames->at(1)); EXPECT_EQ(StackFrame::FRAME_TRUST_SCAN, frame1->trust); ASSERT_EQ((StackFrameMIPS::CONTEXT_VALID_PC | StackFrameMIPS::CONTEXT_VALID_SP | StackFrameMIPS::CONTEXT_VALID_FP | StackFrameMIPS::CONTEXT_VALID_RA), frame1->context_validity); EXPECT_EQ(return_address - 2 * sizeof(return_address), frame1->context.epc); EXPECT_EQ(frame1_sp.Value(), frame1->context.iregs[MD_CONTEXT_MIPS_REG_SP]); EXPECT_EQ("marsupial", frame1->function_name); EXPECT_EQ(0x00500100U, frame1->function_base); } TEST_F(GetCallerFrame, CheckStackFrameSizeLimit) { raw_context.context_flags = raw_context.context_flags | MD_CONTEXT_MIPS64_FULL; // If the stackwalker resorts to stack scanning, it will scan only // 1024 bytes of stack which correspondes to maximum size of stack frame. stack_section.start() = 0x80000000; uint64_t return_address1 = 0x00500100; uint64_t return_address2 = 0x00500900; Label frame1_sp, frame2_sp; stack_section // frame 0 .Append(32, 0) // space .D64(0x00490000) // junk that's not .D64(0x00600000) // a return address .Append(96, 0) // more space .D64(frame1_sp) // stack pointer .D64(return_address1) // actual return address // frame 1 .Mark(&frame1_sp) .Append(128 * 4, 0) // space .D64(0x00F00000) // more junk .D64(0x0000000D) .Append(128 * 4, 0) // more space .D64(frame2_sp) // stack pointer .D64(return_address2) // actual return address // (won't be found) // frame 2 .Mark(&frame2_sp) .Append(64, 0); // end of stack RegionFromSection(); raw_context.epc = 0x00405510; raw_context.iregs[MD_CONTEXT_MIPS_REG_SP] = stack_section.start().Value(); raw_context.iregs[MD_CONTEXT_MIPS_REG_RA] = return_address1; StackFrameSymbolizer frame_symbolizer(&supplier, &resolver); StackwalkerMIPS walker(&system_info, &raw_context, &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()); StackFrameMIPS* frame0 = static_cast(frames->at(0)); EXPECT_EQ(StackFrame::FRAME_TRUST_CONTEXT, frame0->trust); ASSERT_EQ(StackFrameMIPS::CONTEXT_VALID_ALL, frame0->context_validity); EXPECT_EQ(0, memcmp(&raw_context, &frame0->context, sizeof(raw_context))); StackFrameMIPS* frame1 = static_cast(frames->at(1)); EXPECT_EQ(StackFrame::FRAME_TRUST_SCAN, frame1->trust); ASSERT_EQ((StackFrameMIPS::CONTEXT_VALID_PC | StackFrameMIPS::CONTEXT_VALID_SP | StackFrameMIPS::CONTEXT_VALID_FP | StackFrameMIPS::CONTEXT_VALID_RA), frame1->context_validity); EXPECT_EQ(return_address1 - 2 * sizeof(return_address1), frame1->context.epc); EXPECT_EQ(frame1_sp.Value(), frame1->context.iregs[MD_CONTEXT_MIPS_REG_SP]); } // Test that set_max_frames_scanned prevents using stack scanning // to find caller frames. TEST_F(GetCallerFrame, ScanningNotAllowed) { raw_context.context_flags = raw_context.context_flags | MD_CONTEXT_MIPS64_FULL; // When the stack walker resorts to scanning the stack, // only fixed number of frames are allowed to be scanned out from stack stack_section.start() = 0x80000000; uint64_t return_address1 = 0x00500100; uint64_t return_address2 = 0x00500900; Label frame1_sp, frame2_sp; stack_section // frame 0 .Append(32, 0) // space .D64(0x00490000) // junk that's not .D64(0x00600000) // a return address .Append(96, 0) // more space .D64(frame1_sp) // stack pointer .D64(return_address1) // actual return address // frame 1 .Mark(&frame1_sp) .Append(128 * 4, 0) // space .D64(0x00F00000) // more junk .D64(0x0000000D) .Append(128 * 4, 0) // more space .D64(frame2_sp) // stack pointer .D64(return_address2) // actual return address // (won't be found) // frame 2 .Mark(&frame2_sp) .Append(64, 0); // end of stack RegionFromSection(); raw_context.epc = 0x00405510; raw_context.iregs[MD_CONTEXT_MIPS_REG_SP] = stack_section.start().Value(); raw_context.iregs[MD_CONTEXT_MIPS_REG_RA] = return_address1; StackFrameSymbolizer frame_symbolizer(&supplier, &resolver); StackwalkerMIPS walker(&system_info, &raw_context, &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()); StackFrameMIPS* frame0 = static_cast(frames->at(0)); EXPECT_EQ(StackFrame::FRAME_TRUST_CONTEXT, frame0->trust); ASSERT_EQ(StackFrameMIPS::CONTEXT_VALID_ALL, frame0->context_validity); EXPECT_EQ(0, memcmp(&raw_context, &frame0->context, sizeof(raw_context))); } struct CFIFixture: public StackwalkerMIPSFixture { CFIFixture() { // Provide some STACK CFI records; SetModuleSymbols(&module1, // The youngest frame's function. "FUNC 4000 1000 0 enchiridion\n" // Initially, nothing has been pushed on the stack, // and the return address is still in the $ra register. "STACK CFI INIT 4000 1000 .cfa: $sp 0 + .ra: $ra\n" // Move stack pointer. "STACK CFI 4004 .cfa: $sp 32 +\n" // store $fp and ra "STACK CFI 4008 $fp: .cfa -8 + ^ .ra: .cfa -4 + ^\n" // restore $fp "STACK CFI 400c .cfa: $fp 32 +\n" // restore $sp "STACK CFI 4018 .cfa: $sp 32 +\n" "STACK CFI 4020 $fp: $fp .cfa: $sp 0 + .ra: .ra\n" // The calling function. "FUNC 5000 1000 0 epictetus\n" // Mark it as end of stack. "STACK CFI INIT 5000 8 .cfa: $sp 0 + .ra: $ra\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: $ra\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.epc = 0x00405500; expected.iregs[MD_CONTEXT_MIPS_REG_S0] = 0x0; expected.iregs[MD_CONTEXT_MIPS_REG_S1] = 0x1; expected.iregs[MD_CONTEXT_MIPS_REG_S2] = 0x2; expected.iregs[MD_CONTEXT_MIPS_REG_S3] = 0x3; expected.iregs[MD_CONTEXT_MIPS_REG_S4] = 0x4; expected.iregs[MD_CONTEXT_MIPS_REG_S5] = 0x5; expected.iregs[MD_CONTEXT_MIPS_REG_S6] = 0x6; expected.iregs[MD_CONTEXT_MIPS_REG_S7] = 0x7; expected.iregs[MD_CONTEXT_MIPS_REG_SP] = 0x80000000; expected.iregs[MD_CONTEXT_MIPS_REG_FP] = 0x80000000; expected.iregs[MD_CONTEXT_MIPS_REG_RA] = 0x00405510; // Expect CFI to recover all callee-save 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 = (StackFrameMIPS::CONTEXT_VALID_PC | StackFrameMIPS::CONTEXT_VALID_S0 | StackFrameMIPS::CONTEXT_VALID_S1 | StackFrameMIPS::CONTEXT_VALID_S2 | StackFrameMIPS::CONTEXT_VALID_S3 | StackFrameMIPS::CONTEXT_VALID_S4 | StackFrameMIPS::CONTEXT_VALID_S5 | StackFrameMIPS::CONTEXT_VALID_S6 | StackFrameMIPS::CONTEXT_VALID_S7 | StackFrameMIPS::CONTEXT_VALID_SP | StackFrameMIPS::CONTEXT_VALID_FP | StackFrameMIPS::CONTEXT_VALID_GP | StackFrameMIPS::CONTEXT_VALID_RA); // By default, context frames provide all registers, as normal. context_frame_validity = StackFrameMIPS::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_MIPS_REG_SP] = stack_section.start().Value(); StackFrameSymbolizer frame_symbolizer(&supplier, &resolver); StackwalkerMIPS walker(&system_info, &raw_context, &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()); StackFrameMIPS* frame0 = static_cast(frames->at(0)); EXPECT_EQ(StackFrame::FRAME_TRUST_CONTEXT, frame0->trust); ASSERT_EQ(StackFrameMIPS::CONTEXT_VALID_ALL, frame0->context_validity); EXPECT_EQ("enchiridion", frame0->function_name); EXPECT_EQ(0x00404000U, frame0->function_base); StackFrameMIPS* frame1 = static_cast(frames->at(1)); EXPECT_EQ(StackFrame::FRAME_TRUST_CFI, frame1->trust); ASSERT_EQ(expected_validity, frame1->context_validity); EXPECT_EQ(expected.iregs[MD_CONTEXT_MIPS_REG_S0], frame1->context.iregs[MD_CONTEXT_MIPS_REG_S0]); EXPECT_EQ(expected.iregs[MD_CONTEXT_MIPS_REG_S1], frame1->context.iregs[MD_CONTEXT_MIPS_REG_S1]); EXPECT_EQ(expected.iregs[MD_CONTEXT_MIPS_REG_S2], frame1->context.iregs[MD_CONTEXT_MIPS_REG_S2]); EXPECT_EQ(expected.iregs[MD_CONTEXT_MIPS_REG_S3], frame1->context.iregs[MD_CONTEXT_MIPS_REG_S3]); EXPECT_EQ(expected.iregs[MD_CONTEXT_MIPS_REG_S4], frame1->context.iregs[MD_CONTEXT_MIPS_REG_S4]); EXPECT_EQ(expected.iregs[MD_CONTEXT_MIPS_REG_S5], frame1->context.iregs[MD_CONTEXT_MIPS_REG_S5]); EXPECT_EQ(expected.iregs[MD_CONTEXT_MIPS_REG_S6], frame1->context.iregs[MD_CONTEXT_MIPS_REG_S6]); EXPECT_EQ(expected.iregs[MD_CONTEXT_MIPS_REG_S7], frame1->context.iregs[MD_CONTEXT_MIPS_REG_S7]); EXPECT_EQ(expected.iregs[MD_CONTEXT_MIPS_REG_FP], frame1->context.iregs[MD_CONTEXT_MIPS_REG_FP]); EXPECT_EQ(expected.iregs[MD_CONTEXT_MIPS_REG_RA], frame1->context.iregs[MD_CONTEXT_MIPS_REG_RA]); EXPECT_EQ(expected.iregs[MD_CONTEXT_MIPS_REG_SP], frame1->context.iregs[MD_CONTEXT_MIPS_REG_SP]); EXPECT_EQ(expected.epc, frame1->context.epc); EXPECT_EQ(expected.epc, frame1->instruction); EXPECT_EQ("epictetus", frame1->function_name); EXPECT_EQ(0x00405000U, frame1->function_base); } // The values we expect to find for the caller's registers. MDRawContextMIPS 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 { }; // TODO(gordanac): add CFI tests TEST_F(CFI, At4004) { raw_context.context_flags = raw_context.context_flags | MD_CONTEXT_MIPS64_FULL; Label frame1_sp = expected.iregs[MD_CONTEXT_MIPS_REG_SP]; stack_section // frame0 .Append(16, 0) // space .D64(frame1_sp) // stack pointer .D64(0x00405510) // return address .Mark(&frame1_sp); // This effectively sets stack_section.start(). raw_context.epc = 0x00404004; CheckWalk(); } // Check that we reject rules that would cause the stack pointer to // move in the wrong direction. TEST_F(CFI, RejectBackwards) { raw_context.context_flags = raw_context.context_flags | MD_CONTEXT_MIPS64_FULL; raw_context.epc = 0x40005000; raw_context.iregs[MD_CONTEXT_MIPS_REG_SP] = 0x80000000; raw_context.iregs[MD_CONTEXT_MIPS_REG_RA] = 0x00405510; StackFrameSymbolizer frame_symbolizer(&supplier, &resolver); StackwalkerMIPS walker(&system_info, &raw_context, &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.context_flags = raw_context.context_flags | MD_CONTEXT_MIPS64_FULL; raw_context.epc = 0x00407000; raw_context.iregs[MD_CONTEXT_MIPS_REG_SP] = 0x80000000; raw_context.iregs[MD_CONTEXT_MIPS_REG_RA] = 0x00405510; StackFrameSymbolizer frame_symbolizer(&supplier, &resolver); StackwalkerMIPS walker(&system_info, &raw_context, &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()); }