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Diffstat (limited to 'toolkit/crashreporter/google-breakpad/src/processor/stackwalker_arm_unittest.cc')
| -rw-r--r-- | toolkit/crashreporter/google-breakpad/src/processor/stackwalker_arm_unittest.cc | 974 |
1 files changed, 0 insertions, 974 deletions
diff --git a/toolkit/crashreporter/google-breakpad/src/processor/stackwalker_arm_unittest.cc b/toolkit/crashreporter/google-breakpad/src/processor/stackwalker_arm_unittest.cc deleted file mode 100644 index 8a0fd5e95..000000000 --- a/toolkit/crashreporter/google-breakpad/src/processor/stackwalker_arm_unittest.cc +++ /dev/null @@ -1,974 +0,0 @@ -// Copyright (c) 2010, Google Inc. -// All rights reserved. -// -// Redistribution and use in source and binary forms, with or without -// modification, are permitted provided that the following conditions are -// met: -// -// * Redistributions of source code must retain the above copyright -// notice, this list of conditions and the following disclaimer. -// * Redistributions in binary form must reproduce the above -// copyright notice, this list of conditions and the following disclaimer -// in the documentation and/or other materials provided with the -// distribution. -// * Neither the name of Google Inc. nor the names of its -// contributors may be used to endorse or promote products derived from -// this software without specific prior written permission. -// -// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS -// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT -// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR -// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT -// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, -// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT -// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, -// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY -// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT -// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE -// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. - -// Original author: Jim Blandy <jimb@mozilla.com> <jimb@red-bean.com> - -// stackwalker_arm_unittest.cc: Unit tests for StackwalkerARM class. - -#include <string.h> -#include <string> -#include <vector> - -#include "breakpad_googletest_includes.h" -#include "common/test_assembler.h" -#include "common/using_std_string.h" -#include "google_breakpad/common/minidump_format.h" -#include "google_breakpad/processor/basic_source_line_resolver.h" -#include "google_breakpad/processor/call_stack.h" -#include "google_breakpad/processor/code_module.h" -#include "google_breakpad/processor/source_line_resolver_interface.h" -#include "google_breakpad/processor/stack_frame_cpu.h" -#include "processor/stackwalker_unittest_utils.h" -#include "processor/stackwalker_arm.h" -#include "processor/windows_frame_info.h" - -using google_breakpad::BasicSourceLineResolver; -using google_breakpad::CallStack; -using google_breakpad::CodeModule; -using google_breakpad::StackFrameSymbolizer; -using google_breakpad::StackFrame; -using google_breakpad::StackFrameARM; -using google_breakpad::Stackwalker; -using google_breakpad::StackwalkerARM; -using google_breakpad::SystemInfo; -using google_breakpad::WindowsFrameInfo; -using google_breakpad::test_assembler::kLittleEndian; -using google_breakpad::test_assembler::Label; -using google_breakpad::test_assembler::Section; -using std::vector; -using testing::_; -using testing::AnyNumber; -using testing::Return; -using testing::SetArgumentPointee; -using testing::Test; - -class StackwalkerARMFixture { - public: - StackwalkerARMFixture() - : stack_section(kLittleEndian), - // Give the two modules reasonable standard locations and names - // for tests to play with. - module1(0x40000000, 0x10000, "module1", "version1"), - module2(0x50000000, 0x10000, "module2", "version2") { - // Identify the system as a Linux system. - system_info.os = "Linux"; - system_info.os_short = "linux"; - system_info.os_version = "Lugubrious Labrador"; - system_info.cpu = "arm"; - system_info.cpu_info = ""; - - // Put distinctive values in the raw CPU context. - BrandContext(&raw_context); - - // Create some modules with some stock debugging information. - modules.Add(&module1); - modules.Add(&module2); - - // By default, none of the modules have symbol info; call - // SetModuleSymbols to override this. - EXPECT_CALL(supplier, GetCStringSymbolData(_, _, _, _, _)) - .WillRepeatedly(Return(MockSymbolSupplier::NOT_FOUND)); - - // Avoid GMOCK WARNING "Uninteresting mock function call - returning - // directly" for FreeSymbolData(). - EXPECT_CALL(supplier, FreeSymbolData(_)).Times(AnyNumber()); - - // Reset max_frames_scanned since it's static. - Stackwalker::set_max_frames_scanned(1024); - } - - // Set the Breakpad symbol information that supplier should return for - // MODULE to INFO. - void SetModuleSymbols(MockCodeModule *module, const string &info) { - size_t buffer_size; - char *buffer = supplier.CopySymbolDataAndOwnTheCopy(info, &buffer_size); - EXPECT_CALL(supplier, GetCStringSymbolData(module, &system_info, _, _, _)) - .WillRepeatedly(DoAll(SetArgumentPointee<3>(buffer), - SetArgumentPointee<4>(buffer_size), - Return(MockSymbolSupplier::FOUND))); - } - - // Populate stack_region with the contents of stack_section. Use - // stack_section.start() as the region's starting address. - void RegionFromSection() { - string contents; - ASSERT_TRUE(stack_section.GetContents(&contents)); - stack_region.Init(stack_section.start().Value(), contents); - } - - // Fill RAW_CONTEXT with pseudo-random data, for round-trip checking. - void BrandContext(MDRawContextARM *raw_context) { - uint8_t x = 173; - for (size_t i = 0; i < sizeof(*raw_context); i++) - reinterpret_cast<uint8_t *>(raw_context)[i] = (x += 17); - } - - SystemInfo system_info; - MDRawContextARM raw_context; - Section stack_section; - MockMemoryRegion stack_region; - MockCodeModule module1; - MockCodeModule module2; - MockCodeModules modules; - MockSymbolSupplier supplier; - BasicSourceLineResolver resolver; - CallStack call_stack; - const vector<StackFrame *> *frames; -}; - -class SanityCheck: public StackwalkerARMFixture, public Test { }; - -TEST_F(SanityCheck, NoResolver) { - // Since we have no call frame information, and all unwinding - // requires call frame information, the stack walk will end after - // the first frame. - StackFrameSymbolizer frame_symbolizer(NULL, NULL); - StackwalkerARM walker(&system_info, &raw_context, -1, &stack_region, &modules, - &frame_symbolizer); - // This should succeed even without a resolver or supplier. - vector<const CodeModule*> modules_without_symbols; - vector<const CodeModule*> modules_with_corrupt_symbols; - ASSERT_TRUE(walker.Walk(&call_stack, &modules_without_symbols, - &modules_with_corrupt_symbols)); - ASSERT_EQ(0U, modules_without_symbols.size()); - ASSERT_EQ(0U, modules_with_corrupt_symbols.size()); - frames = call_stack.frames(); - ASSERT_EQ(1U, frames->size()); - StackFrameARM *frame = static_cast<StackFrameARM *>(frames->at(0)); - // Check that the values from the original raw context made it - // through to the context in the stack frame. - EXPECT_EQ(0, memcmp(&raw_context, &frame->context, sizeof(raw_context))); -} - -class GetContextFrame: public StackwalkerARMFixture, public Test { }; - -TEST_F(GetContextFrame, Simple) { - // Since we have no call frame information, and all unwinding - // requires call frame information, the stack walk will end after - // the first frame. - StackFrameSymbolizer frame_symbolizer(&supplier, &resolver); - StackwalkerARM walker(&system_info, &raw_context, -1, &stack_region, &modules, - &frame_symbolizer); - vector<const CodeModule*> modules_without_symbols; - vector<const CodeModule*> modules_with_corrupt_symbols; - ASSERT_TRUE(walker.Walk(&call_stack, &modules_without_symbols, - &modules_with_corrupt_symbols)); - ASSERT_EQ(0U, modules_without_symbols.size()); - ASSERT_EQ(0U, modules_with_corrupt_symbols.size()); - frames = call_stack.frames(); - ASSERT_EQ(1U, frames->size()); - StackFrameARM *frame = static_cast<StackFrameARM *>(frames->at(0)); - // Check that the values from the original raw context made it - // through to the context in the stack frame. - EXPECT_EQ(0, memcmp(&raw_context, &frame->context, sizeof(raw_context))); -} - -// The stackwalker should be able to produce the context frame even -// without stack memory present. -TEST_F(GetContextFrame, NoStackMemory) { - StackFrameSymbolizer frame_symbolizer(&supplier, &resolver); - StackwalkerARM walker(&system_info, &raw_context, -1, NULL, &modules, - &frame_symbolizer); - vector<const CodeModule*> modules_without_symbols; - vector<const CodeModule*> modules_with_corrupt_symbols; - ASSERT_TRUE(walker.Walk(&call_stack, &modules_without_symbols, - &modules_with_corrupt_symbols)); - ASSERT_EQ(0U, modules_without_symbols.size()); - ASSERT_EQ(0U, modules_with_corrupt_symbols.size()); - frames = call_stack.frames(); - ASSERT_EQ(1U, frames->size()); - StackFrameARM *frame = static_cast<StackFrameARM *>(frames->at(0)); - // Check that the values from the original raw context made it - // through to the context in the stack frame. - EXPECT_EQ(0, memcmp(&raw_context, &frame->context, sizeof(raw_context))); -} - -class GetCallerFrame: public StackwalkerARMFixture, public Test { }; - -TEST_F(GetCallerFrame, ScanWithoutSymbols) { - // When the stack walker resorts to scanning the stack, - // only addresses located within loaded modules are - // considered valid return addresses. - // Force scanning through three frames to ensure that the - // stack pointer is set properly in scan-recovered frames. - stack_section.start() = 0x80000000; - uint32_t return_address1 = 0x50000100; - uint32_t return_address2 = 0x50000900; - Label frame1_sp, frame2_sp; - stack_section - // frame 0 - .Append(16, 0) // space - - .D32(0x40090000) // junk that's not - .D32(0x60000000) // a return address - - .D32(return_address1) // actual return address - // frame 1 - .Mark(&frame1_sp) - .Append(16, 0) // space - - .D32(0xF0000000) // more junk - .D32(0x0000000D) - - .D32(return_address2) // actual return address - // frame 2 - .Mark(&frame2_sp) - .Append(32, 0); // end of stack - RegionFromSection(); - - raw_context.iregs[MD_CONTEXT_ARM_REG_PC] = 0x40005510; - raw_context.iregs[MD_CONTEXT_ARM_REG_SP] = stack_section.start().Value(); - - StackFrameSymbolizer frame_symbolizer(&supplier, &resolver); - StackwalkerARM walker(&system_info, &raw_context, -1, &stack_region, &modules, - &frame_symbolizer); - vector<const CodeModule*> modules_without_symbols; - vector<const CodeModule*> modules_with_corrupt_symbols; - ASSERT_TRUE(walker.Walk(&call_stack, &modules_without_symbols, - &modules_with_corrupt_symbols)); - ASSERT_EQ(2U, modules_without_symbols.size()); - ASSERT_EQ("module1", modules_without_symbols[0]->debug_file()); - ASSERT_EQ("module2", modules_without_symbols[1]->debug_file()); - ASSERT_EQ(0U, modules_with_corrupt_symbols.size()); - frames = call_stack.frames(); - ASSERT_EQ(3U, frames->size()); - - StackFrameARM *frame0 = static_cast<StackFrameARM *>(frames->at(0)); - EXPECT_EQ(StackFrame::FRAME_TRUST_CONTEXT, frame0->trust); - ASSERT_EQ(StackFrameARM::CONTEXT_VALID_ALL, frame0->context_validity); - EXPECT_EQ(0, memcmp(&raw_context, &frame0->context, sizeof(raw_context))); - - StackFrameARM *frame1 = static_cast<StackFrameARM *>(frames->at(1)); - EXPECT_EQ(StackFrame::FRAME_TRUST_SCAN, frame1->trust); - ASSERT_EQ((StackFrameARM::CONTEXT_VALID_PC | - StackFrameARM::CONTEXT_VALID_SP), - frame1->context_validity); - EXPECT_EQ(return_address1, frame1->context.iregs[MD_CONTEXT_ARM_REG_PC]); - EXPECT_EQ(frame1_sp.Value(), frame1->context.iregs[MD_CONTEXT_ARM_REG_SP]); - - StackFrameARM *frame2 = static_cast<StackFrameARM *>(frames->at(2)); - EXPECT_EQ(StackFrame::FRAME_TRUST_SCAN, frame2->trust); - ASSERT_EQ((StackFrameARM::CONTEXT_VALID_PC | - StackFrameARM::CONTEXT_VALID_SP), - frame2->context_validity); - EXPECT_EQ(return_address2, frame2->context.iregs[MD_CONTEXT_ARM_REG_PC]); - EXPECT_EQ(frame2_sp.Value(), frame2->context.iregs[MD_CONTEXT_ARM_REG_SP]); -} - -TEST_F(GetCallerFrame, ScanWithFunctionSymbols) { - // During stack scanning, if a potential return address - // is located within a loaded module that has symbols, - // it is only considered a valid return address if it - // lies within a function's bounds. - stack_section.start() = 0x80000000; - uint32_t return_address = 0x50000200; - Label frame1_sp; - - stack_section - // frame 0 - .Append(16, 0) // space - - .D32(0x40090000) // junk that's not - .D32(0x60000000) // a return address - - .D32(0x40001000) // a couple of plausible addresses - .D32(0x5000F000) // that are not within functions - - .D32(return_address) // actual return address - // frame 1 - .Mark(&frame1_sp) - .Append(32, 0); // end of stack - RegionFromSection(); - - raw_context.iregs[MD_CONTEXT_ARM_REG_PC] = 0x40000200; - raw_context.iregs[MD_CONTEXT_ARM_REG_SP] = stack_section.start().Value(); - - SetModuleSymbols(&module1, - // The youngest frame's function. - "FUNC 100 400 10 monotreme\n"); - SetModuleSymbols(&module2, - // The calling frame's function. - "FUNC 100 400 10 marsupial\n"); - - StackFrameSymbolizer frame_symbolizer(&supplier, &resolver); - StackwalkerARM walker(&system_info, &raw_context, -1, &stack_region, &modules, - &frame_symbolizer); - vector<const CodeModule*> modules_without_symbols; - vector<const CodeModule*> modules_with_corrupt_symbols; - ASSERT_TRUE(walker.Walk(&call_stack, &modules_without_symbols, - &modules_with_corrupt_symbols)); - ASSERT_EQ(0U, modules_without_symbols.size()); - ASSERT_EQ(0U, modules_with_corrupt_symbols.size()); - frames = call_stack.frames(); - ASSERT_EQ(2U, frames->size()); - - StackFrameARM *frame0 = static_cast<StackFrameARM *>(frames->at(0)); - EXPECT_EQ(StackFrame::FRAME_TRUST_CONTEXT, frame0->trust); - ASSERT_EQ(StackFrameARM::CONTEXT_VALID_ALL, frame0->context_validity); - EXPECT_EQ(0, memcmp(&raw_context, &frame0->context, sizeof(raw_context))); - EXPECT_EQ("monotreme", frame0->function_name); - EXPECT_EQ(0x40000100U, frame0->function_base); - - StackFrameARM *frame1 = static_cast<StackFrameARM *>(frames->at(1)); - EXPECT_EQ(StackFrame::FRAME_TRUST_SCAN, frame1->trust); - ASSERT_EQ((StackFrameARM::CONTEXT_VALID_PC | - StackFrameARM::CONTEXT_VALID_SP), - frame1->context_validity); - EXPECT_EQ(return_address, frame1->context.iregs[MD_CONTEXT_ARM_REG_PC]); - EXPECT_EQ(frame1_sp.Value(), frame1->context.iregs[MD_CONTEXT_ARM_REG_SP]); - EXPECT_EQ("marsupial", frame1->function_name); - EXPECT_EQ(0x50000100U, frame1->function_base); -} - -TEST_F(GetCallerFrame, ScanFirstFrame) { - // If the stackwalker resorts to stack scanning, it will scan much - // farther to find the caller of the context frame. - stack_section.start() = 0x80000000; - uint32_t return_address1 = 0x50000100; - uint32_t return_address2 = 0x50000900; - Label frame1_sp, frame2_sp; - stack_section - // frame 0 - .Append(32, 0) // space - - .D32(0x40090000) // junk that's not - .D32(0x60000000) // a return address - - .Append(96, 0) // more space - - .D32(return_address1) // actual return address - // frame 1 - .Mark(&frame1_sp) - .Append(32, 0) // space - - .D32(0xF0000000) // more junk - .D32(0x0000000D) - - .Append(136, 0) // more space - - .D32(return_address2) // actual return address - // (won't be found) - // frame 2 - .Mark(&frame2_sp) - .Append(32, 0); // end of stack - RegionFromSection(); - - raw_context.iregs[MD_CONTEXT_ARM_REG_PC] = 0x40005510; - raw_context.iregs[MD_CONTEXT_ARM_REG_SP] = stack_section.start().Value(); - - StackFrameSymbolizer frame_symbolizer(&supplier, &resolver); - StackwalkerARM walker(&system_info, &raw_context, -1, &stack_region, &modules, - &frame_symbolizer); - vector<const CodeModule*> modules_without_symbols; - vector<const CodeModule*> modules_with_corrupt_symbols; - ASSERT_TRUE(walker.Walk(&call_stack, &modules_without_symbols, - &modules_with_corrupt_symbols)); - ASSERT_EQ(2U, modules_without_symbols.size()); - ASSERT_EQ("module1", modules_without_symbols[0]->debug_file()); - ASSERT_EQ("module2", modules_without_symbols[1]->debug_file()); - ASSERT_EQ(0U, modules_with_corrupt_symbols.size()); - frames = call_stack.frames(); - ASSERT_EQ(2U, frames->size()); - - StackFrameARM *frame0 = static_cast<StackFrameARM *>(frames->at(0)); - EXPECT_EQ(StackFrame::FRAME_TRUST_CONTEXT, frame0->trust); - ASSERT_EQ(StackFrameARM::CONTEXT_VALID_ALL, frame0->context_validity); - EXPECT_EQ(0, memcmp(&raw_context, &frame0->context, sizeof(raw_context))); - - StackFrameARM *frame1 = static_cast<StackFrameARM *>(frames->at(1)); - EXPECT_EQ(StackFrame::FRAME_TRUST_SCAN, frame1->trust); - ASSERT_EQ((StackFrameARM::CONTEXT_VALID_PC | - StackFrameARM::CONTEXT_VALID_SP), - frame1->context_validity); - EXPECT_EQ(return_address1, frame1->context.iregs[MD_CONTEXT_ARM_REG_PC]); - EXPECT_EQ(frame1_sp.Value(), frame1->context.iregs[MD_CONTEXT_ARM_REG_SP]); -} - -// Test that set_max_frames_scanned prevents using stack scanning -// to find caller frames. -TEST_F(GetCallerFrame, ScanningNotAllowed) { - // When the stack walker resorts to scanning the stack, - // only addresses located within loaded modules are - // considered valid return addresses. - stack_section.start() = 0x80000000; - uint32_t return_address1 = 0x50000100; - uint32_t return_address2 = 0x50000900; - Label frame1_sp, frame2_sp; - stack_section - // frame 0 - .Append(16, 0) // space - - .D32(0x40090000) // junk that's not - .D32(0x60000000) // a return address - - .D32(return_address1) // actual return address - // frame 1 - .Mark(&frame1_sp) - .Append(16, 0) // space - - .D32(0xF0000000) // more junk - .D32(0x0000000D) - - .D32(return_address2) // actual return address - // frame 2 - .Mark(&frame2_sp) - .Append(32, 0); // end of stack - RegionFromSection(); - - raw_context.iregs[MD_CONTEXT_ARM_REG_PC] = 0x40005510; - raw_context.iregs[MD_CONTEXT_ARM_REG_SP] = stack_section.start().Value(); - - StackFrameSymbolizer frame_symbolizer(&supplier, &resolver); - StackwalkerARM walker(&system_info, &raw_context, -1, &stack_region, &modules, - &frame_symbolizer); - Stackwalker::set_max_frames_scanned(0); - - vector<const CodeModule*> modules_without_symbols; - vector<const CodeModule*> modules_with_corrupt_symbols; - ASSERT_TRUE(walker.Walk(&call_stack, &modules_without_symbols, - &modules_with_corrupt_symbols)); - ASSERT_EQ(1U, modules_without_symbols.size()); - ASSERT_EQ("module1", modules_without_symbols[0]->debug_file()); - ASSERT_EQ(0U, modules_with_corrupt_symbols.size()); - frames = call_stack.frames(); - ASSERT_EQ(1U, frames->size()); - - StackFrameARM *frame0 = static_cast<StackFrameARM *>(frames->at(0)); - EXPECT_EQ(StackFrame::FRAME_TRUST_CONTEXT, frame0->trust); - ASSERT_EQ(StackFrameARM::CONTEXT_VALID_ALL, frame0->context_validity); - EXPECT_EQ(0, memcmp(&raw_context, &frame0->context, sizeof(raw_context))); -} - -struct CFIFixture: public StackwalkerARMFixture { - CFIFixture() { - // Provide a bunch of STACK CFI records; we'll walk to the caller - // from every point in this series, expecting to find the same set - // of register values. - SetModuleSymbols(&module1, - // The youngest frame's function. - "FUNC 4000 1000 10 enchiridion\n" - // Initially, nothing has been pushed on the stack, - // and the return address is still in the link register. - "STACK CFI INIT 4000 100 .cfa: sp .ra: lr\n" - // Push r4, the frame pointer, and the link register. - "STACK CFI 4001 .cfa: sp 12 + r4: .cfa 12 - ^" - " r11: .cfa 8 - ^ .ra: .cfa 4 - ^\n" - // Save r4..r7 in r0..r3: verify that we populate - // the youngest frame with all the values we have. - "STACK CFI 4002 r4: r0 r5: r1 r6: r2 r7: r3\n" - // Restore r4..r7. Save the non-callee-saves register r1. - "STACK CFI 4003 .cfa: sp 16 + r1: .cfa 16 - ^" - " r4: r4 r5: r5 r6: r6 r7: r7\n" - // Move the .cfa back four bytes, to point at the return - // address, and restore the sp explicitly. - "STACK CFI 4005 .cfa: sp 12 + r1: .cfa 12 - ^" - " r11: .cfa 4 - ^ .ra: .cfa ^ sp: .cfa 4 +\n" - // Recover the PC explicitly from a new stack slot; - // provide garbage for the .ra. - "STACK CFI 4006 .cfa: sp 16 + pc: .cfa 16 - ^\n" - - // The calling function. - "FUNC 5000 1000 10 epictetus\n" - // Mark it as end of stack. - "STACK CFI INIT 5000 1000 .cfa: 0 .ra: 0\n" - - // A function whose CFI makes the stack pointer - // go backwards. - "FUNC 6000 1000 20 palinal\n" - "STACK CFI INIT 6000 1000 .cfa: sp 4 - .ra: lr\n" - - // A function with CFI expressions that can't be - // evaluated. - "FUNC 7000 1000 20 rhetorical\n" - "STACK CFI INIT 7000 1000 .cfa: moot .ra: ambiguous\n"); - - // Provide some distinctive values for the caller's registers. - expected.iregs[MD_CONTEXT_ARM_REG_PC] = 0x40005510; - expected.iregs[MD_CONTEXT_ARM_REG_SP] = 0x80000000; - expected.iregs[4] = 0xb5d55e68; - expected.iregs[5] = 0xebd134f3; - expected.iregs[6] = 0xa31e74bc; - expected.iregs[7] = 0x2dcb16b3; - expected.iregs[8] = 0x2ada2137; - expected.iregs[9] = 0xbbbb557d; - expected.iregs[10] = 0x48bf8ca7; - expected.iregs[MD_CONTEXT_ARM_REG_FP] = 0x8112e110; - - // Expect CFI to recover all callee-saves registers. Since CFI is the - // only stack frame construction technique we have, aside from the - // context frame itself, there's no way for us to have a set of valid - // registers smaller than this. - expected_validity = (StackFrameARM::CONTEXT_VALID_PC | - StackFrameARM::CONTEXT_VALID_SP | - StackFrameARM::CONTEXT_VALID_R4 | - StackFrameARM::CONTEXT_VALID_R5 | - StackFrameARM::CONTEXT_VALID_R6 | - StackFrameARM::CONTEXT_VALID_R7 | - StackFrameARM::CONTEXT_VALID_R8 | - StackFrameARM::CONTEXT_VALID_R9 | - StackFrameARM::CONTEXT_VALID_R10 | - StackFrameARM::CONTEXT_VALID_FP); - - // By default, context frames provide all registers, as normal. - context_frame_validity = StackFrameARM::CONTEXT_VALID_ALL; - - // By default, registers are unchanged. - raw_context = expected; - } - - // Walk the stack, using stack_section as the contents of the stack - // and raw_context as the current register values. (Set the stack - // pointer to the stack's starting address.) Expect two stack - // frames; in the older frame, expect the callee-saves registers to - // have values matching those in 'expected'. - void CheckWalk() { - RegionFromSection(); - raw_context.iregs[MD_CONTEXT_ARM_REG_SP] = stack_section.start().Value(); - - StackFrameSymbolizer frame_symbolizer(&supplier, &resolver); - StackwalkerARM walker(&system_info, &raw_context, -1, &stack_region, - &modules, &frame_symbolizer); - walker.SetContextFrameValidity(context_frame_validity); - vector<const CodeModule*> modules_without_symbols; - vector<const CodeModule*> modules_with_corrupt_symbols; - ASSERT_TRUE(walker.Walk(&call_stack, &modules_without_symbols, - &modules_with_corrupt_symbols)); - ASSERT_EQ(0U, modules_without_symbols.size()); - ASSERT_EQ(0U, modules_with_corrupt_symbols.size()); - frames = call_stack.frames(); - ASSERT_EQ(2U, frames->size()); - - StackFrameARM *frame0 = static_cast<StackFrameARM *>(frames->at(0)); - EXPECT_EQ(StackFrame::FRAME_TRUST_CONTEXT, frame0->trust); - ASSERT_EQ(context_frame_validity, frame0->context_validity); - EXPECT_EQ("enchiridion", frame0->function_name); - EXPECT_EQ(0x40004000U, frame0->function_base); - - StackFrameARM *frame1 = static_cast<StackFrameARM *>(frames->at(1)); - EXPECT_EQ(StackFrame::FRAME_TRUST_CFI, frame1->trust); - ASSERT_EQ(expected_validity, frame1->context_validity); - if (expected_validity & StackFrameARM::CONTEXT_VALID_R1) - EXPECT_EQ(expected.iregs[1], frame1->context.iregs[1]); - if (expected_validity & StackFrameARM::CONTEXT_VALID_R4) - EXPECT_EQ(expected.iregs[4], frame1->context.iregs[4]); - if (expected_validity & StackFrameARM::CONTEXT_VALID_R5) - EXPECT_EQ(expected.iregs[5], frame1->context.iregs[5]); - if (expected_validity & StackFrameARM::CONTEXT_VALID_R6) - EXPECT_EQ(expected.iregs[6], frame1->context.iregs[6]); - if (expected_validity & StackFrameARM::CONTEXT_VALID_R7) - EXPECT_EQ(expected.iregs[7], frame1->context.iregs[7]); - if (expected_validity & StackFrameARM::CONTEXT_VALID_R8) - EXPECT_EQ(expected.iregs[8], frame1->context.iregs[8]); - if (expected_validity & StackFrameARM::CONTEXT_VALID_R9) - EXPECT_EQ(expected.iregs[9], frame1->context.iregs[9]); - if (expected_validity & StackFrameARM::CONTEXT_VALID_R10) - EXPECT_EQ(expected.iregs[10], frame1->context.iregs[10]); - if (expected_validity & StackFrameARM::CONTEXT_VALID_FP) - EXPECT_EQ(expected.iregs[MD_CONTEXT_ARM_REG_FP], - frame1->context.iregs[MD_CONTEXT_ARM_REG_FP]); - - // We would never have gotten a frame in the first place if the SP - // and PC weren't valid or ->instruction weren't set. - EXPECT_EQ(expected.iregs[MD_CONTEXT_ARM_REG_SP], - frame1->context.iregs[MD_CONTEXT_ARM_REG_SP]); - EXPECT_EQ(expected.iregs[MD_CONTEXT_ARM_REG_PC], - frame1->context.iregs[MD_CONTEXT_ARM_REG_PC]); - EXPECT_EQ(expected.iregs[MD_CONTEXT_ARM_REG_PC], - frame1->instruction + 2); - EXPECT_EQ("epictetus", frame1->function_name); - } - - // The values we expect to find for the caller's registers. - MDRawContextARM expected; - - // The validity mask for expected. - int expected_validity; - - // The validity mask to impose on the context frame. - int context_frame_validity; -}; - -class CFI: public CFIFixture, public Test { }; - -TEST_F(CFI, At4000) { - stack_section.start() = expected.iregs[MD_CONTEXT_ARM_REG_SP]; - raw_context.iregs[MD_CONTEXT_ARM_REG_PC] = 0x40004000; - raw_context.iregs[MD_CONTEXT_ARM_REG_LR] = 0x40005510; - CheckWalk(); -} - -TEST_F(CFI, At4001) { - Label frame1_sp = expected.iregs[MD_CONTEXT_ARM_REG_SP]; - stack_section - .D32(0xb5d55e68) // saved r4 - .D32(0x8112e110) // saved fp - .D32(0x40005510) // return address - .Mark(&frame1_sp); // This effectively sets stack_section.start(). - raw_context.iregs[MD_CONTEXT_ARM_REG_PC] = 0x40004001; - raw_context.iregs[4] = 0x635adc9f; // distinct callee r4 - raw_context.iregs[MD_CONTEXT_ARM_REG_FP] = 0xbe145fc4; // distinct callee fp - CheckWalk(); -} - -// As above, but unwind from a context that has only the PC and SP. -TEST_F(CFI, At4001LimitedValidity) { - context_frame_validity = - StackFrameARM::CONTEXT_VALID_PC | StackFrameARM::CONTEXT_VALID_SP; - raw_context.iregs[MD_CONTEXT_ARM_REG_PC] = 0x40004001; - raw_context.iregs[MD_CONTEXT_ARM_REG_FP] = 0xbe145fc4; // distinct callee fp - Label frame1_sp = expected.iregs[MD_CONTEXT_ARM_REG_SP]; - stack_section - .D32(0xb5d55e68) // saved r4 - .D32(0x8112e110) // saved fp - .D32(0x40005510) // return address - .Mark(&frame1_sp); // This effectively sets stack_section.start(). - expected_validity = (StackFrameARM::CONTEXT_VALID_PC - | StackFrameARM::CONTEXT_VALID_SP - | StackFrameARM::CONTEXT_VALID_FP - | StackFrameARM::CONTEXT_VALID_R4); - CheckWalk(); -} - -TEST_F(CFI, At4002) { - Label frame1_sp = expected.iregs[MD_CONTEXT_ARM_REG_SP]; - stack_section - .D32(0xfb81ff3d) // no longer saved r4 - .D32(0x8112e110) // saved fp - .D32(0x40005510) // return address - .Mark(&frame1_sp); // This effectively sets stack_section.start(). - raw_context.iregs[MD_CONTEXT_ARM_REG_PC] = 0x40004002; - raw_context.iregs[0] = 0xb5d55e68; // saved r4 - raw_context.iregs[1] = 0xebd134f3; // saved r5 - raw_context.iregs[2] = 0xa31e74bc; // saved r6 - raw_context.iregs[3] = 0x2dcb16b3; // saved r7 - raw_context.iregs[4] = 0xfdd35466; // distinct callee r4 - raw_context.iregs[5] = 0xf18c946c; // distinct callee r5 - raw_context.iregs[6] = 0xac2079e8; // distinct callee r6 - raw_context.iregs[7] = 0xa449829f; // distinct callee r7 - raw_context.iregs[MD_CONTEXT_ARM_REG_FP] = 0xbe145fc4; // distinct callee fp - CheckWalk(); -} - -TEST_F(CFI, At4003) { - Label frame1_sp = expected.iregs[MD_CONTEXT_ARM_REG_SP]; - stack_section - .D32(0x48c8dd5a) // saved r1 (even though it's not callee-saves) - .D32(0xcb78040e) // no longer saved r4 - .D32(0x8112e110) // saved fp - .D32(0x40005510) // return address - .Mark(&frame1_sp); // This effectively sets stack_section.start(). - raw_context.iregs[MD_CONTEXT_ARM_REG_PC] = 0x40004003; - raw_context.iregs[1] = 0xfb756319; // distinct callee r1 - raw_context.iregs[MD_CONTEXT_ARM_REG_FP] = 0x0a2857ea; // distinct callee fp - expected.iregs[1] = 0x48c8dd5a; // caller's r1 - expected_validity |= StackFrameARM::CONTEXT_VALID_R1; - CheckWalk(); -} - -// We have no new rule at module offset 0x4004, so the results here should -// be the same as those at module offset 0x4003. -TEST_F(CFI, At4004) { - Label frame1_sp = expected.iregs[MD_CONTEXT_ARM_REG_SP]; - stack_section - .D32(0x48c8dd5a) // saved r1 (even though it's not callee-saves) - .D32(0xcb78040e) // no longer saved r4 - .D32(0x8112e110) // saved fp - .D32(0x40005510) // return address - .Mark(&frame1_sp); // This effectively sets stack_section.start(). - raw_context.iregs[MD_CONTEXT_ARM_REG_PC] = 0x40004004; - raw_context.iregs[1] = 0xfb756319; // distinct callee r1 - expected.iregs[1] = 0x48c8dd5a; // caller's r1 - expected_validity |= StackFrameARM::CONTEXT_VALID_R1; - CheckWalk(); -} - -// Here we move the .cfa, but provide an explicit rule to recover the SP, -// so again there should be no change in the registers recovered. -TEST_F(CFI, At4005) { - Label frame1_sp = expected.iregs[MD_CONTEXT_ARM_REG_SP]; - stack_section - .D32(0x48c8dd5a) // saved r1 (even though it's not callee-saves) - .D32(0xf013f841) // no longer saved r4 - .D32(0x8112e110) // saved fp - .D32(0x40005510) // return address - .Mark(&frame1_sp); // This effectively sets stack_section.start(). - raw_context.iregs[MD_CONTEXT_ARM_REG_PC] = 0x40004005; - raw_context.iregs[1] = 0xfb756319; // distinct callee r1 - expected.iregs[1] = 0x48c8dd5a; // caller's r1 - expected_validity |= StackFrameARM::CONTEXT_VALID_R1; - CheckWalk(); -} - -// Here we provide an explicit rule for the PC, and have the saved .ra be -// bogus. -TEST_F(CFI, At4006) { - Label frame1_sp = expected.iregs[MD_CONTEXT_ARM_REG_SP]; - stack_section - .D32(0x40005510) // saved pc - .D32(0x48c8dd5a) // saved r1 (even though it's not callee-saves) - .D32(0xf013f841) // no longer saved r4 - .D32(0x8112e110) // saved fp - .D32(0xf8d15783) // .ra rule recovers this, which is garbage - .Mark(&frame1_sp); // This effectively sets stack_section.start(). - raw_context.iregs[MD_CONTEXT_ARM_REG_PC] = 0x40004006; - raw_context.iregs[1] = 0xfb756319; // callee's r1, different from caller's - expected.iregs[1] = 0x48c8dd5a; // caller's r1 - expected_validity |= StackFrameARM::CONTEXT_VALID_R1; - CheckWalk(); -} - -// Check that we reject rules that would cause the stack pointer to -// move in the wrong direction. -TEST_F(CFI, RejectBackwards) { - raw_context.iregs[MD_CONTEXT_ARM_REG_PC] = 0x40006000; - raw_context.iregs[MD_CONTEXT_ARM_REG_SP] = 0x80000000; - raw_context.iregs[MD_CONTEXT_ARM_REG_LR] = 0x40005510; - StackFrameSymbolizer frame_symbolizer(&supplier, &resolver); - StackwalkerARM walker(&system_info, &raw_context, -1, &stack_region, &modules, - &frame_symbolizer); - vector<const CodeModule*> modules_without_symbols; - vector<const CodeModule*> modules_with_corrupt_symbols; - ASSERT_TRUE(walker.Walk(&call_stack, &modules_without_symbols, - &modules_with_corrupt_symbols)); - ASSERT_EQ(0U, modules_without_symbols.size()); - ASSERT_EQ(0U, modules_with_corrupt_symbols.size()); - frames = call_stack.frames(); - ASSERT_EQ(1U, frames->size()); -} - -// Check that we reject rules whose expressions' evaluation fails. -TEST_F(CFI, RejectBadExpressions) { - raw_context.iregs[MD_CONTEXT_ARM_REG_PC] = 0x40007000; - raw_context.iregs[MD_CONTEXT_ARM_REG_SP] = 0x80000000; - StackFrameSymbolizer frame_symbolizer(&supplier, &resolver); - StackwalkerARM walker(&system_info, &raw_context, -1, &stack_region, &modules, - &frame_symbolizer); - vector<const CodeModule*> modules_without_symbols; - vector<const CodeModule*> modules_with_corrupt_symbols; - ASSERT_TRUE(walker.Walk(&call_stack, &modules_without_symbols, - &modules_with_corrupt_symbols)); - ASSERT_EQ(0U, modules_without_symbols.size()); - ASSERT_EQ(0U, modules_with_corrupt_symbols.size()); - frames = call_stack.frames(); - ASSERT_EQ(1U, frames->size()); -} - -class StackwalkerARMFixtureIOS : public StackwalkerARMFixture { - public: - StackwalkerARMFixtureIOS() { - system_info.os = "iOS"; - system_info.os_short = "ios"; - } -}; - -class GetFramesByFramePointer: public StackwalkerARMFixtureIOS, public Test { }; - -TEST_F(GetFramesByFramePointer, OnlyFramePointer) { - stack_section.start() = 0x80000000; - uint32_t return_address1 = 0x50000100; - uint32_t return_address2 = 0x50000900; - Label frame1_sp, frame2_sp; - Label frame1_fp, frame2_fp; - stack_section - // frame 0 - .Append(32, 0) // Whatever values on the stack. - .D32(0x0000000D) // junk that's not - .D32(0xF0000000) // a return address. - - .Mark(&frame1_fp) // Next fp will point to the next value. - .D32(frame2_fp) // Save current frame pointer. - .D32(return_address2) // Save current link register. - .Mark(&frame1_sp) - - // frame 1 - .Append(32, 0) // Whatever values on the stack. - .D32(0x0000000D) // junk that's not - .D32(0xF0000000) // a return address. - - .Mark(&frame2_fp) - .D32(0) - .D32(0) - .Mark(&frame2_sp) - - // frame 2 - .Append(32, 0) // Whatever values on the stack. - .D32(0x0000000D) // junk that's not - .D32(0xF0000000); // a return address. - RegionFromSection(); - - - raw_context.iregs[MD_CONTEXT_ARM_REG_PC] = 0x40005510; - raw_context.iregs[MD_CONTEXT_ARM_REG_LR] = return_address1; - raw_context.iregs[MD_CONTEXT_ARM_REG_IOS_FP] = frame1_fp.Value(); - raw_context.iregs[MD_CONTEXT_ARM_REG_SP] = stack_section.start().Value(); - - StackFrameSymbolizer frame_symbolizer(&supplier, &resolver); - StackwalkerARM walker(&system_info, &raw_context, MD_CONTEXT_ARM_REG_IOS_FP, - &stack_region, &modules, &frame_symbolizer); - - vector<const CodeModule*> modules_without_symbols; - vector<const CodeModule*> modules_with_corrupt_symbols; - ASSERT_TRUE(walker.Walk(&call_stack, &modules_without_symbols, - &modules_with_corrupt_symbols)); - ASSERT_EQ(2U, modules_without_symbols.size()); - ASSERT_EQ("module1", modules_without_symbols[0]->debug_file()); - ASSERT_EQ("module2", modules_without_symbols[1]->debug_file()); - ASSERT_EQ(0U, modules_with_corrupt_symbols.size()); - frames = call_stack.frames(); - ASSERT_EQ(3U, frames->size()); - - StackFrameARM *frame0 = static_cast<StackFrameARM *>(frames->at(0)); - EXPECT_EQ(StackFrame::FRAME_TRUST_CONTEXT, frame0->trust); - ASSERT_EQ(StackFrameARM::CONTEXT_VALID_ALL, frame0->context_validity); - EXPECT_EQ(0, memcmp(&raw_context, &frame0->context, sizeof(raw_context))); - - StackFrameARM *frame1 = static_cast<StackFrameARM *>(frames->at(1)); - EXPECT_EQ(StackFrame::FRAME_TRUST_FP, frame1->trust); - ASSERT_EQ((StackFrameARM::CONTEXT_VALID_PC | - StackFrameARM::CONTEXT_VALID_LR | - StackFrameARM::RegisterValidFlag(MD_CONTEXT_ARM_REG_IOS_FP) | - StackFrameARM::CONTEXT_VALID_SP), - frame1->context_validity); - EXPECT_EQ(return_address1, frame1->context.iregs[MD_CONTEXT_ARM_REG_PC]); - EXPECT_EQ(return_address2, frame1->context.iregs[MD_CONTEXT_ARM_REG_LR]); - EXPECT_EQ(frame1_sp.Value(), frame1->context.iregs[MD_CONTEXT_ARM_REG_SP]); - EXPECT_EQ(frame2_fp.Value(), - frame1->context.iregs[MD_CONTEXT_ARM_REG_IOS_FP]); - - StackFrameARM *frame2 = static_cast<StackFrameARM *>(frames->at(2)); - EXPECT_EQ(StackFrame::FRAME_TRUST_FP, frame2->trust); - ASSERT_EQ((StackFrameARM::CONTEXT_VALID_PC | - StackFrameARM::CONTEXT_VALID_LR | - StackFrameARM::RegisterValidFlag(MD_CONTEXT_ARM_REG_IOS_FP) | - StackFrameARM::CONTEXT_VALID_SP), - frame2->context_validity); - EXPECT_EQ(return_address2, frame2->context.iregs[MD_CONTEXT_ARM_REG_PC]); - EXPECT_EQ(0U, frame2->context.iregs[MD_CONTEXT_ARM_REG_LR]); - EXPECT_EQ(frame2_sp.Value(), frame2->context.iregs[MD_CONTEXT_ARM_REG_SP]); - EXPECT_EQ(0U, frame2->context.iregs[MD_CONTEXT_ARM_REG_IOS_FP]); -} - -TEST_F(GetFramesByFramePointer, FramePointerAndCFI) { - // Provide the standatd STACK CFI records that is obtained when exmining an - // executable produced by XCode. - SetModuleSymbols(&module1, - // Adding a function in CFI. - "FUNC 4000 1000 10 enchiridion\n" - - "STACK CFI INIT 4000 100 .cfa: sp 0 + .ra: lr\n" - "STACK CFI 4001 .cfa: sp 8 + .ra: .cfa -4 + ^" - " r7: .cfa -8 + ^\n" - "STACK CFI 4002 .cfa: r7 8 +\n" - ); - - stack_section.start() = 0x80000000; - uint32_t return_address1 = 0x40004010; - uint32_t return_address2 = 0x50000900; - Label frame1_sp, frame2_sp; - Label frame1_fp, frame2_fp; - stack_section - // frame 0 - .Append(32, 0) // Whatever values on the stack. - .D32(0x0000000D) // junk that's not - .D32(0xF0000000) // a return address. - - .Mark(&frame1_fp) // Next fp will point to the next value. - .D32(frame2_fp) // Save current frame pointer. - .D32(return_address2) // Save current link register. - .Mark(&frame1_sp) - - // frame 1 - .Append(32, 0) // Whatever values on the stack. - .D32(0x0000000D) // junk that's not - .D32(0xF0000000) // a return address. - - .Mark(&frame2_fp) - .D32(0) - .D32(0) - .Mark(&frame2_sp) - - // frame 2 - .Append(32, 0) // Whatever values on the stack. - .D32(0x0000000D) // junk that's not - .D32(0xF0000000); // a return address. - RegionFromSection(); - - - raw_context.iregs[MD_CONTEXT_ARM_REG_PC] = 0x50000400; - raw_context.iregs[MD_CONTEXT_ARM_REG_LR] = return_address1; - raw_context.iregs[MD_CONTEXT_ARM_REG_IOS_FP] = frame1_fp.Value(); - raw_context.iregs[MD_CONTEXT_ARM_REG_SP] = stack_section.start().Value(); - - StackFrameSymbolizer frame_symbolizer(&supplier, &resolver); - StackwalkerARM walker(&system_info, &raw_context, MD_CONTEXT_ARM_REG_IOS_FP, - &stack_region, &modules, &frame_symbolizer); - - vector<const CodeModule*> modules_without_symbols; - vector<const CodeModule*> modules_with_corrupt_symbols; - ASSERT_TRUE(walker.Walk(&call_stack, &modules_without_symbols, - &modules_with_corrupt_symbols)); - ASSERT_EQ(1U, modules_without_symbols.size()); - ASSERT_EQ("module2", modules_without_symbols[0]->debug_file()); - ASSERT_EQ(0U, modules_with_corrupt_symbols.size()); - frames = call_stack.frames(); - ASSERT_EQ(3U, frames->size()); - - StackFrameARM *frame0 = static_cast<StackFrameARM *>(frames->at(0)); - EXPECT_EQ(StackFrame::FRAME_TRUST_CONTEXT, frame0->trust); - ASSERT_EQ(StackFrameARM::CONTEXT_VALID_ALL, frame0->context_validity); - EXPECT_EQ(0, memcmp(&raw_context, &frame0->context, sizeof(raw_context))); - - StackFrameARM *frame1 = static_cast<StackFrameARM *>(frames->at(1)); - EXPECT_EQ(StackFrame::FRAME_TRUST_FP, frame1->trust); - ASSERT_EQ((StackFrameARM::CONTEXT_VALID_PC | - StackFrameARM::CONTEXT_VALID_LR | - StackFrameARM::RegisterValidFlag(MD_CONTEXT_ARM_REG_IOS_FP) | - StackFrameARM::CONTEXT_VALID_SP), - frame1->context_validity); - EXPECT_EQ(return_address1, frame1->context.iregs[MD_CONTEXT_ARM_REG_PC]); - EXPECT_EQ(return_address2, frame1->context.iregs[MD_CONTEXT_ARM_REG_LR]); - EXPECT_EQ(frame1_sp.Value(), frame1->context.iregs[MD_CONTEXT_ARM_REG_SP]); - EXPECT_EQ(frame2_fp.Value(), - frame1->context.iregs[MD_CONTEXT_ARM_REG_IOS_FP]); - EXPECT_EQ("enchiridion", frame1->function_name); - EXPECT_EQ(0x40004000U, frame1->function_base); - - - StackFrameARM *frame2 = static_cast<StackFrameARM *>(frames->at(2)); - EXPECT_EQ(StackFrame::FRAME_TRUST_CFI, frame2->trust); - ASSERT_EQ((StackFrameARM::CONTEXT_VALID_PC | - StackFrameARM::CONTEXT_VALID_LR | - StackFrameARM::RegisterValidFlag(MD_CONTEXT_ARM_REG_IOS_FP) | - StackFrameARM::CONTEXT_VALID_SP), - frame2->context_validity); - EXPECT_EQ(return_address2, frame2->context.iregs[MD_CONTEXT_ARM_REG_PC]); - EXPECT_EQ(0U, frame2->context.iregs[MD_CONTEXT_ARM_REG_LR]); - EXPECT_EQ(frame2_sp.Value(), frame2->context.iregs[MD_CONTEXT_ARM_REG_SP]); - EXPECT_EQ(0U, frame2->context.iregs[MD_CONTEXT_ARM_REG_IOS_FP]); -} |