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Unified Diff: src/processor/stackwalker_mips_unittest.cc

Issue 614002: [MIPS] Add support for Breakpad for MIPS (Closed) Base URL: http://google-breakpad.googlecode.com/svn/trunk/src/
Patch Set: Added unittest for stackwalker_mips class and few more changes as per code review comments. Created 11 years, 7 months ago
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Index: src/processor/stackwalker_mips_unittest.cc
===================================================================
--- src/processor/stackwalker_mips_unittest.cc (revision 0)
+++ src/processor/stackwalker_mips_unittest.cc (revision 0)
@@ -0,0 +1,697 @@
+// 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) {
+ 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) {
+ 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.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) {
+ // 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) {
+ // 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) {
+ // 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) {
+ // 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) {
+ 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.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.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());
+}
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