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Diffstat (limited to 'toolkit/crashreporter/google-breakpad/src/processor/stackwalker_mips_unittest.cc')
| -rw-r--r-- | toolkit/crashreporter/google-breakpad/src/processor/stackwalker_mips_unittest.cc | 707 |
1 files changed, 0 insertions, 707 deletions
diff --git a/toolkit/crashreporter/google-breakpad/src/processor/stackwalker_mips_unittest.cc b/toolkit/crashreporter/google-breakpad/src/processor/stackwalker_mips_unittest.cc deleted file mode 100644 index 5398c2b33..000000000 --- a/toolkit/crashreporter/google-breakpad/src/processor/stackwalker_mips_unittest.cc +++ /dev/null @@ -1,707 +0,0 @@ -// 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: Gordana Cmiljanovic <gordana.cmiljanovic@imgtec.com> - -// stackwalker_mips_unittest.cc: Unit tests for StackwalkerMIPS 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_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 = "mips"; - 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<uint8_t*>(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<StackFrame*>* frames; -}; - -class SanityCheck: public StackwalkerMIPSFixture, public Test { }; - -TEST_F(SanityCheck, NoResolver) { - raw_context.context_flags = raw_context.context_flags | MD_CONTEXT_MIPS_FULL; - stack_section.start() = 0x80000000; - stack_section.D32(0).D32(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<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()); - StackFrameMIPS* frame = static_cast<StackFrameMIPS*>(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_MIPS_FULL; - stack_section.start() = 0x80000000; - stack_section.D32(0).D32(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<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(); - StackFrameMIPS* frame = static_cast<StackFrameMIPS*>(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_MIPS_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<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(); - StackFrameMIPS* frame = static_cast<StackFrameMIPS*>(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_MIPS_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; - uint32_t return_address1 = 0x00400100; - uint32_t return_address2 = 0x00400900; - Label frame1_sp, frame2_sp; - stack_section - // frame 0 - .Append(16, 0) // space - - .D32(0x00490000) // junk that's not - .D32(0x00600000) // a return address - - .D32(frame1_sp) // stack pointer - .D32(return_address1) // actual return address - // frame 1 - .Mark(&frame1_sp) - .Append(16, 0) // space - - .D32(0xF0000000) // more junk - .D32(0x0000000D) - - .D32(frame2_sp) // stack pointer - .D32(return_address2) // actual return address - // frame 2 - .Mark(&frame2_sp) - .Append(32, 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<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(3U, frames->size()); - - StackFrameMIPS* frame0 = static_cast<StackFrameMIPS*>(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<StackFrameMIPS*>(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<StackFrameMIPS*>(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_MIPS_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; - uint32_t return_address = 0x00500200; - Label frame1_sp; - stack_section - // frame 0 - .Append(16, 0) // space - - .D32(0x00490000) // junk that's not - .D32(0x00600000) // a return address - - .D32(0x00401000) // a couple of plausible addresses - .D32(0x0050F000) // that are not within functions - - .D32(frame1_sp) // stack pointer - .D32(return_address) // actual return address - // frame 1 - .Mark(&frame1_sp) - .Append(32, 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<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()); - - StackFrameMIPS* frame0 = static_cast<StackFrameMIPS*>(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<StackFrameMIPS*>(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_MIPS_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; - uint32_t return_address1 = 0x00500100; - uint32_t return_address2 = 0x00500900; - Label frame1_sp, frame2_sp; - stack_section - // frame 0 - .Append(32, 0) // space - - .D32(0x00490000) // junk that's not - .D32(0x00600000) // a return address - - .Append(96, 0) // more space - - .D32(frame1_sp) // stack pointer - .D32(return_address1) // actual return address - // frame 1 - .Mark(&frame1_sp) - .Append(128 * 4, 0) // space - - .D32(0x00F00000) // more junk - .D32(0x0000000D) - - .Append(128 * 4, 0) // more space - - .D32(frame2_sp) // stack pointer - .D32(return_address2) // actual return address - // (won't be found) - // frame 2 - .Mark(&frame2_sp) - .Append(32, 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<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()); - - StackFrameMIPS* frame0 = static_cast<StackFrameMIPS*>(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<StackFrameMIPS*>(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_MIPS_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; - uint32_t return_address1 = 0x00500100; - uint32_t return_address2 = 0x00500900; - Label frame1_sp, frame2_sp; - stack_section - // frame 0 - .Append(32, 0) // space - - .D32(0x00490000) // junk that's not - .D32(0x00600000) // a return address - - .Append(96, 0) // more space - - .D32(frame1_sp) // stack pointer - .D32(return_address1) // actual return address - // frame 1 - .Mark(&frame1_sp) - .Append(128 * 4, 0) // space - - .D32(0x00F00000) // more junk - .D32(0x0000000D) - - .Append(128 * 4, 0) // more space - - .D32(frame2_sp) // stack pointer - .D32(return_address2) // actual return address - // (won't be found) - // frame 2 - .Mark(&frame2_sp) - .Append(32, 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<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()); - - StackFrameMIPS* frame0 = static_cast<StackFrameMIPS*>(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" - // Initially, nothing has been pushed on the stack, - // and the return address is still in the $ra register. - "STACK CFI INIT 5000 1000 .cfa: $sp .ra: $ra\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 = 0x00405508; - 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_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<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()); - - StackFrameMIPS* frame0 = static_cast<StackFrameMIPS*>(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<StackFrameMIPS*>(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_MIPS_FULL; - Label frame1_sp = expected.iregs[MD_CONTEXT_MIPS_REG_SP]; - stack_section - // frame0 - .Append(24, 0) // space - .D32(frame1_sp) // stack pointer - .D32(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_MIPS_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<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.context_flags = raw_context.context_flags | MD_CONTEXT_MIPS_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<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()); -} |