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29 
30 // Original author: Jim Blandy <jimb@mozilla.com> <jimb@red-bean.com>
31 
32 // stackwalker_arm64_unittest.cc: Unit tests for StackwalkerARM64 class.
33 
34 #include <string.h>
35 #include <string>
36 #include <vector>
37 
38 #include "breakpad_googletest_includes.h"
39 #include "common/test_assembler.h"
40 #include "common/using_std_string.h"
41 #include "google_breakpad/common/minidump_format.h"
42 #include "google_breakpad/processor/basic_source_line_resolver.h"
43 #include "google_breakpad/processor/call_stack.h"
44 #include "google_breakpad/processor/code_module.h"
45 #include "google_breakpad/processor/source_line_resolver_interface.h"
46 #include "google_breakpad/processor/stack_frame_cpu.h"
47 #include "processor/stackwalker_unittest_utils.h"
48 #include "processor/stackwalker_arm64.h"
49 #include "processor/windows_frame_info.h"
50 
51 using google_breakpad::BasicSourceLineResolver;
52 using google_breakpad::CallStack;
53 using google_breakpad::CodeModule;
54 using google_breakpad::StackFrameSymbolizer;
55 using google_breakpad::StackFrame;
56 using google_breakpad::StackFrameARM64;
57 using google_breakpad::Stackwalker;
58 using google_breakpad::StackwalkerARM64;
59 using google_breakpad::SystemInfo;
60 using google_breakpad::WindowsFrameInfo;
61 using google_breakpad::test_assembler::kLittleEndian;
62 using google_breakpad::test_assembler::Label;
63 using google_breakpad::test_assembler::Section;
64 using std::vector;
65 using testing::_;
66 using testing::AnyNumber;
67 using testing::DoAll;
68 using testing::Return;
69 using testing::SetArgumentPointee;
70 using testing::Test;
71 
72 class StackwalkerARM64Fixture {
73  public:
StackwalkerARM64Fixture()74   StackwalkerARM64Fixture()
75     : stack_section(kLittleEndian),
76       // Give the two modules reasonable standard locations and names
77       // for tests to play with.
78       module1(0x40000000, 0x10000, "module1", "version1"),
79       module2(0x50000000, 0x10000, "module2", "version2") {
80     // Identify the system as an iOS system.
81     system_info.os = "iOS";
82     system_info.os_short = "ios";
83     system_info.cpu = "arm64";
84     system_info.cpu_info = "";
85 
86     // Put distinctive values in the raw CPU context.
87     BrandContext(&raw_context);
88 
89     // Create some modules with some stock debugging information.
90     modules.Add(&module1);
91     modules.Add(&module2);
92 
93     // By default, none of the modules have symbol info; call
94     // SetModuleSymbols to override this.
95     EXPECT_CALL(supplier, GetCStringSymbolData(_, _, _, _, _))
96       .WillRepeatedly(Return(MockSymbolSupplier::NOT_FOUND));
97 
98     // Avoid GMOCK WARNING "Uninteresting mock function call - returning
99     // directly" for FreeSymbolData().
100     EXPECT_CALL(supplier, FreeSymbolData(_)).Times(AnyNumber());
101 
102     // Reset max_frames_scanned since it's static.
103     Stackwalker::set_max_frames_scanned(1024);
104   }
105 
106   // Set the Breakpad symbol information that supplier should return for
107   // MODULE to INFO.
SetModuleSymbols(MockCodeModule * module,const string & info)108   void SetModuleSymbols(MockCodeModule *module, const string &info) {
109     size_t buffer_size;
110     char *buffer = supplier.CopySymbolDataAndOwnTheCopy(info, &buffer_size);
111     EXPECT_CALL(supplier, GetCStringSymbolData(module, &system_info, _, _, _))
112       .WillRepeatedly(DoAll(SetArgumentPointee<3>(buffer),
113                             SetArgumentPointee<4>(buffer_size),
114                             Return(MockSymbolSupplier::FOUND)));
115   }
116 
117   // Populate stack_region with the contents of stack_section. Use
118   // stack_section.start() as the region's starting address.
RegionFromSection()119   void RegionFromSection() {
120     string contents;
121     ASSERT_TRUE(stack_section.GetContents(&contents));
122     stack_region.Init(stack_section.start().Value(), contents);
123   }
124 
125   // Fill RAW_CONTEXT with pseudo-random data, for round-trip checking.
BrandContext(MDRawContextARM64 * raw_context)126   void BrandContext(MDRawContextARM64 *raw_context) {
127     uint8_t x = 173;
128     for (size_t i = 0; i < sizeof(*raw_context); i++)
129       reinterpret_cast<uint8_t *>(raw_context)[i] = (x += 17);
130   }
131 
132   SystemInfo system_info;
133   MDRawContextARM64 raw_context;
134   Section stack_section;
135   MockMemoryRegion stack_region;
136   MockCodeModule module1;
137   MockCodeModule module2;
138   MockCodeModules modules;
139   MockSymbolSupplier supplier;
140   BasicSourceLineResolver resolver;
141   CallStack call_stack;
142   const vector<StackFrame *> *frames;
143 };
144 
145 class SanityCheck: public StackwalkerARM64Fixture, public Test { };
146 
TEST_F(SanityCheck,NoResolver)147 TEST_F(SanityCheck, NoResolver) {
148   // Since the context's frame pointer is garbage, the stack walk will end after
149   // the first frame.
150   StackFrameSymbolizer frame_symbolizer(NULL, NULL);
151   StackwalkerARM64 walker(&system_info, &raw_context, &stack_region, &modules,
152                           &frame_symbolizer);
153   // This should succeed even without a resolver or supplier.
154   vector<const CodeModule*> modules_without_symbols;
155   vector<const CodeModule*> modules_with_corrupt_symbols;
156   ASSERT_TRUE(walker.Walk(&call_stack, &modules_without_symbols,
157                           &modules_with_corrupt_symbols));
158   ASSERT_EQ(0U, modules_without_symbols.size());
159   ASSERT_EQ(0U, modules_with_corrupt_symbols.size());
160   frames = call_stack.frames();
161   ASSERT_EQ(1U, frames->size());
162   StackFrameARM64 *frame = static_cast<StackFrameARM64 *>(frames->at(0));
163   // Check that the values from the original raw context made it
164   // through to the context in the stack frame.
165   EXPECT_EQ(0, memcmp(&raw_context, &frame->context, sizeof(raw_context)));
166 }
167 
168 class GetContextFrame: public StackwalkerARM64Fixture, public Test { };
169 
170 // The stackwalker should be able to produce the context frame even
171 // without stack memory present.
TEST_F(GetContextFrame,NoStackMemory)172 TEST_F(GetContextFrame, NoStackMemory) {
173   StackFrameSymbolizer frame_symbolizer(&supplier, &resolver);
174   StackwalkerARM64 walker(&system_info, &raw_context, NULL, &modules,
175                           &frame_symbolizer);
176   vector<const CodeModule*> modules_without_symbols;
177   vector<const CodeModule*> modules_with_corrupt_symbols;
178   ASSERT_TRUE(walker.Walk(&call_stack, &modules_without_symbols,
179                           &modules_with_corrupt_symbols));
180   ASSERT_EQ(0U, modules_without_symbols.size());
181   ASSERT_EQ(0U, modules_with_corrupt_symbols.size());
182   frames = call_stack.frames();
183   ASSERT_EQ(1U, frames->size());
184   StackFrameARM64 *frame = static_cast<StackFrameARM64 *>(frames->at(0));
185   // Check that the values from the original raw context made it
186   // through to the context in the stack frame.
187   EXPECT_EQ(0, memcmp(&raw_context, &frame->context, sizeof(raw_context)));
188 }
189 
190 class GetCallerFrame: public StackwalkerARM64Fixture, public Test { };
191 
TEST_F(GetCallerFrame,ScanWithoutSymbols)192 TEST_F(GetCallerFrame, ScanWithoutSymbols) {
193   // When the stack walker resorts to scanning the stack,
194   // only addresses located within loaded modules are
195   // considered valid return addresses.
196   // Force scanning through three frames to ensure that the
197   // stack pointer is set properly in scan-recovered frames.
198   stack_section.start() = 0x80000000;
199   uint64_t return_address1 = 0x50000100;
200   uint64_t return_address2 = 0x50000900;
201   Label frame1_sp, frame2_sp;
202   stack_section
203     // frame 0
204     .Append(16, 0)                      // space
205 
206     .D64(0x40090000)                    // junk that's not
207     .D64(0x60000000)                    // a return address
208 
209     .D64(return_address1)               // actual return address
210     // frame 1
211     .Mark(&frame1_sp)
212     .Append(16, 0)                      // space
213 
214     .D64(0xF0000000)                    // more junk
215     .D64(0x0000000D)
216 
217     .D64(return_address2)               // actual return address
218     // frame 2
219     .Mark(&frame2_sp)
220     .Append(64, 0);                     // end of stack
221   RegionFromSection();
222 
223   raw_context.iregs[MD_CONTEXT_ARM64_REG_PC] = 0x40005510;
224   raw_context.iregs[MD_CONTEXT_ARM64_REG_SP] = stack_section.start().Value();
225 
226   StackFrameSymbolizer frame_symbolizer(&supplier, &resolver);
227   StackwalkerARM64 walker(&system_info, &raw_context, &stack_region, &modules,
228                           &frame_symbolizer);
229   vector<const CodeModule*> modules_without_symbols;
230   vector<const CodeModule*> modules_with_corrupt_symbols;
231   ASSERT_TRUE(walker.Walk(&call_stack, &modules_without_symbols,
232                           &modules_with_corrupt_symbols));
233   ASSERT_EQ(2U, modules_without_symbols.size());
234   ASSERT_EQ("module1", modules_without_symbols[0]->debug_file());
235   ASSERT_EQ("module2", modules_without_symbols[1]->debug_file());
236   ASSERT_EQ(0U, modules_with_corrupt_symbols.size());
237   frames = call_stack.frames();
238   ASSERT_EQ(3U, frames->size());
239 
240   StackFrameARM64 *frame0 = static_cast<StackFrameARM64 *>(frames->at(0));
241   EXPECT_EQ(StackFrame::FRAME_TRUST_CONTEXT, frame0->trust);
242   ASSERT_EQ(StackFrameARM64::CONTEXT_VALID_ALL,
243             frame0->context_validity);
244   EXPECT_EQ(0, memcmp(&raw_context, &frame0->context, sizeof(raw_context)));
245 
246   StackFrameARM64 *frame1 = static_cast<StackFrameARM64 *>(frames->at(1));
247   EXPECT_EQ(StackFrame::FRAME_TRUST_SCAN, frame1->trust);
248   ASSERT_EQ((StackFrameARM64::CONTEXT_VALID_PC |
249              StackFrameARM64::CONTEXT_VALID_SP),
250             frame1->context_validity);
251   EXPECT_EQ(return_address1, frame1->context.iregs[MD_CONTEXT_ARM64_REG_PC]);
252   EXPECT_EQ(frame1_sp.Value(), frame1->context.iregs[MD_CONTEXT_ARM64_REG_SP]);
253 
254   StackFrameARM64 *frame2 = static_cast<StackFrameARM64 *>(frames->at(2));
255   EXPECT_EQ(StackFrame::FRAME_TRUST_SCAN, frame2->trust);
256   ASSERT_EQ((StackFrameARM64::CONTEXT_VALID_PC |
257              StackFrameARM64::CONTEXT_VALID_SP),
258             frame2->context_validity);
259   EXPECT_EQ(return_address2, frame2->context.iregs[MD_CONTEXT_ARM64_REG_PC]);
260   EXPECT_EQ(frame2_sp.Value(), frame2->context.iregs[MD_CONTEXT_ARM64_REG_SP]);
261 }
262 
TEST_F(GetCallerFrame,ScanWithFunctionSymbols)263 TEST_F(GetCallerFrame, ScanWithFunctionSymbols) {
264   // During stack scanning, if a potential return address
265   // is located within a loaded module that has symbols,
266   // it is only considered a valid return address if it
267   // lies within a function's bounds.
268   stack_section.start() = 0x80000000;
269   uint64_t return_address = 0x50000200;
270   Label frame1_sp;
271 
272   stack_section
273     // frame 0
274     .Append(16, 0)                      // space
275 
276     .D64(0x40090000)                    // junk that's not
277     .D64(0x60000000)                    // a return address
278 
279     .D64(0x40001000)                    // a couple of plausible addresses
280     .D64(0x5000F000)                    // that are not within functions
281 
282     .D64(return_address)                // actual return address
283     // frame 1
284     .Mark(&frame1_sp)
285     .Append(64, 0);                     // end of stack
286   RegionFromSection();
287 
288   raw_context.iregs[MD_CONTEXT_ARM64_REG_PC] = 0x40000200;
289   raw_context.iregs[MD_CONTEXT_ARM64_REG_SP] = stack_section.start().Value();
290 
291   SetModuleSymbols(&module1,
292                    // The youngest frame's function.
293                    "FUNC 100 400 10 monotreme\n");
294   SetModuleSymbols(&module2,
295                    // The calling frame's function.
296                    "FUNC 100 400 10 marsupial\n");
297 
298   StackFrameSymbolizer frame_symbolizer(&supplier, &resolver);
299   StackwalkerARM64 walker(&system_info, &raw_context, &stack_region, &modules,
300                           &frame_symbolizer);
301   vector<const CodeModule*> modules_without_symbols;
302   vector<const CodeModule*> modules_with_corrupt_symbols;
303   ASSERT_TRUE(walker.Walk(&call_stack, &modules_without_symbols,
304                           &modules_with_corrupt_symbols));
305   ASSERT_EQ(0U, modules_without_symbols.size());
306   ASSERT_EQ(0U, modules_with_corrupt_symbols.size());
307   frames = call_stack.frames();
308   ASSERT_EQ(2U, frames->size());
309 
310   StackFrameARM64 *frame0 = static_cast<StackFrameARM64 *>(frames->at(0));
311   EXPECT_EQ(StackFrame::FRAME_TRUST_CONTEXT, frame0->trust);
312   ASSERT_EQ(StackFrameARM64::CONTEXT_VALID_ALL,
313             frame0->context_validity);
314   EXPECT_EQ(0, memcmp(&raw_context, &frame0->context, sizeof(raw_context)));
315   EXPECT_EQ("monotreme", frame0->function_name);
316   EXPECT_EQ(0x40000100ULL, frame0->function_base);
317 
318   StackFrameARM64 *frame1 = static_cast<StackFrameARM64 *>(frames->at(1));
319   EXPECT_EQ(StackFrame::FRAME_TRUST_SCAN, frame1->trust);
320   ASSERT_EQ((StackFrameARM64::CONTEXT_VALID_PC |
321              StackFrameARM64::CONTEXT_VALID_SP),
322             frame1->context_validity);
323   EXPECT_EQ(return_address, frame1->context.iregs[MD_CONTEXT_ARM64_REG_PC]);
324   EXPECT_EQ(frame1_sp.Value(), frame1->context.iregs[MD_CONTEXT_ARM64_REG_SP]);
325   EXPECT_EQ("marsupial", frame1->function_name);
326   EXPECT_EQ(0x50000100ULL, frame1->function_base);
327 }
328 
TEST_F(GetCallerFrame,ScanFirstFrame)329 TEST_F(GetCallerFrame, ScanFirstFrame) {
330   // If the stackwalker resorts to stack scanning, it will scan much
331   // farther to find the caller of the context frame.
332   stack_section.start() = 0x80000000;
333   uint64_t return_address1 = 0x50000100;
334   uint64_t return_address2 = 0x50000900;
335   Label frame1_sp, frame2_sp;
336   stack_section
337     // frame 0
338     .Append(32, 0)                      // space
339 
340     .D64(0x40090000)                    // junk that's not
341     .D64(0x60000000)                    // a return address
342 
343     .Append(96, 0)                      // more space
344 
345     .D64(return_address1)               // actual return address
346     // frame 1
347     .Mark(&frame1_sp)
348     .Append(32, 0)                      // space
349 
350     .D64(0xF0000000)                    // more junk
351     .D64(0x0000000D)
352 
353     .Append(336, 0)                     // more space
354 
355     .D64(return_address2)               // actual return address
356                                         // (won't be found)
357     // frame 2
358     .Mark(&frame2_sp)
359     .Append(64, 0);                     // end of stack
360   RegionFromSection();
361 
362   raw_context.iregs[MD_CONTEXT_ARM64_REG_PC] = 0x40005510;
363   raw_context.iregs[MD_CONTEXT_ARM64_REG_SP] = stack_section.start().Value();
364 
365   StackFrameSymbolizer frame_symbolizer(&supplier, &resolver);
366   StackwalkerARM64 walker(&system_info, &raw_context, &stack_region, &modules,
367                           &frame_symbolizer);
368   vector<const CodeModule*> modules_without_symbols;
369   vector<const CodeModule*> modules_with_corrupt_symbols;
370   ASSERT_TRUE(walker.Walk(&call_stack, &modules_without_symbols,
371                           &modules_with_corrupt_symbols));
372   ASSERT_EQ(2U, modules_without_symbols.size());
373   ASSERT_EQ("module1", modules_without_symbols[0]->debug_file());
374   ASSERT_EQ("module2", modules_without_symbols[1]->debug_file());
375   ASSERT_EQ(0U, modules_with_corrupt_symbols.size());
376   frames = call_stack.frames();
377   ASSERT_EQ(2U, frames->size());
378 
379   StackFrameARM64 *frame0 = static_cast<StackFrameARM64 *>(frames->at(0));
380   EXPECT_EQ(StackFrame::FRAME_TRUST_CONTEXT, frame0->trust);
381   ASSERT_EQ(StackFrameARM64::CONTEXT_VALID_ALL,
382             frame0->context_validity);
383   EXPECT_EQ(0, memcmp(&raw_context, &frame0->context, sizeof(raw_context)));
384 
385   StackFrameARM64 *frame1 = static_cast<StackFrameARM64 *>(frames->at(1));
386   EXPECT_EQ(StackFrame::FRAME_TRUST_SCAN, frame1->trust);
387   ASSERT_EQ((StackFrameARM64::CONTEXT_VALID_PC |
388              StackFrameARM64::CONTEXT_VALID_SP),
389             frame1->context_validity);
390   EXPECT_EQ(return_address1, frame1->context.iregs[MD_CONTEXT_ARM64_REG_PC]);
391   EXPECT_EQ(frame1_sp.Value(), frame1->context.iregs[MD_CONTEXT_ARM64_REG_SP]);
392 }
393 
394 // Test that set_max_frames_scanned prevents using stack scanning
395 // to find caller frames.
TEST_F(GetCallerFrame,ScanningNotAllowed)396 TEST_F(GetCallerFrame, ScanningNotAllowed) {
397   // When the stack walker resorts to scanning the stack,
398   // only addresses located within loaded modules are
399   // considered valid return addresses.
400   stack_section.start() = 0x80000000;
401   uint64_t return_address1 = 0x50000100;
402   uint64_t return_address2 = 0x50000900;
403   Label frame1_sp, frame2_sp;
404   stack_section
405     // frame 0
406     .Append(16, 0)                      // space
407 
408     .D64(0x40090000)                    // junk that's not
409     .D64(0x60000000)                    // a return address
410 
411     .D64(return_address1)               // actual return address
412     // frame 1
413     .Mark(&frame1_sp)
414     .Append(16, 0)                      // space
415 
416     .D64(0xF0000000)                    // more junk
417     .D64(0x0000000D)
418 
419     .D64(return_address2)               // actual return address
420     // frame 2
421     .Mark(&frame2_sp)
422     .Append(64, 0);                     // end of stack
423   RegionFromSection();
424 
425   raw_context.iregs[MD_CONTEXT_ARM64_REG_PC] = 0x40005510;
426   raw_context.iregs[MD_CONTEXT_ARM64_REG_SP] = stack_section.start().Value();
427 
428   StackFrameSymbolizer frame_symbolizer(&supplier, &resolver);
429   StackwalkerARM64 walker(&system_info, &raw_context, &stack_region, &modules,
430                           &frame_symbolizer);
431   Stackwalker::set_max_frames_scanned(0);
432 
433   vector<const CodeModule*> modules_without_symbols;
434   vector<const CodeModule*> modules_with_corrupt_symbols;
435   ASSERT_TRUE(walker.Walk(&call_stack, &modules_without_symbols,
436                           &modules_with_corrupt_symbols));
437   ASSERT_EQ(1U, modules_without_symbols.size());
438   ASSERT_EQ("module1", modules_without_symbols[0]->debug_file());
439   ASSERT_EQ(0U, modules_with_corrupt_symbols.size());
440   frames = call_stack.frames();
441   ASSERT_EQ(1U, frames->size());
442 
443   StackFrameARM64 *frame0 = static_cast<StackFrameARM64 *>(frames->at(0));
444   EXPECT_EQ(StackFrame::FRAME_TRUST_CONTEXT, frame0->trust);
445   ASSERT_EQ(StackFrameARM64::CONTEXT_VALID_ALL,
446             frame0->context_validity);
447   EXPECT_EQ(0, memcmp(&raw_context, &frame0->context, sizeof(raw_context)));
448 }
449 
450 class GetFramesByFramePointer: public StackwalkerARM64Fixture, public Test { };
451 
TEST_F(GetFramesByFramePointer,OnlyFramePointer)452 TEST_F(GetFramesByFramePointer, OnlyFramePointer) {
453   stack_section.start() = 0x80000000;
454   uint64_t return_address1 = 0x50000100;
455   uint64_t return_address2 = 0x50000900;
456   Label frame1_sp, frame2_sp;
457   Label frame1_fp, frame2_fp;
458   stack_section
459     // frame 0
460     .Append(64, 0)           // Whatever values on the stack.
461     .D64(0x0000000D)         // junk that's not
462     .D64(0xF0000000)         // a return address.
463 
464     .Mark(&frame1_fp)        // Next fp will point to the next value.
465     .D64(frame2_fp)          // Save current frame pointer.
466     .D64(return_address2)    // Save current link register.
467     .Mark(&frame1_sp)
468 
469     // frame 1
470     .Append(64, 0)           // Whatever values on the stack.
471     .D64(0x0000000D)         // junk that's not
472     .D64(0xF0000000)         // a return address.
473 
474     .Mark(&frame2_fp)
475     .D64(0)
476     .D64(0)
477     .Mark(&frame2_sp)
478 
479     // frame 2
480     .Append(64, 0)           // Whatever values on the stack.
481     .D64(0x0000000D)         // junk that's not
482     .D64(0xF0000000);        // a return address.
483   RegionFromSection();
484 
485 
486   raw_context.iregs[MD_CONTEXT_ARM64_REG_PC] = 0x40005510;
487   raw_context.iregs[MD_CONTEXT_ARM64_REG_LR] = return_address1;
488   raw_context.iregs[MD_CONTEXT_ARM64_REG_FP] = frame1_fp.Value();
489   raw_context.iregs[MD_CONTEXT_ARM64_REG_SP] = stack_section.start().Value();
490 
491   StackFrameSymbolizer frame_symbolizer(&supplier, &resolver);
492   StackwalkerARM64 walker(&system_info, &raw_context,
493                           &stack_region, &modules, &frame_symbolizer);
494 
495   vector<const CodeModule*> modules_without_symbols;
496   vector<const CodeModule*> modules_with_corrupt_symbols;
497   ASSERT_TRUE(walker.Walk(&call_stack, &modules_without_symbols,
498                           &modules_with_corrupt_symbols));
499   ASSERT_EQ(2U, modules_without_symbols.size());
500   ASSERT_EQ("module1", modules_without_symbols[0]->debug_file());
501   ASSERT_EQ("module2", modules_without_symbols[1]->debug_file());
502   ASSERT_EQ(0U, modules_with_corrupt_symbols.size());
503   frames = call_stack.frames();
504   ASSERT_EQ(3U, frames->size());
505 
506   StackFrameARM64 *frame0 = static_cast<StackFrameARM64 *>(frames->at(0));
507   EXPECT_EQ(StackFrame::FRAME_TRUST_CONTEXT, frame0->trust);
508   ASSERT_EQ(StackFrameARM64::CONTEXT_VALID_ALL,
509             frame0->context_validity);
510   EXPECT_EQ(0, memcmp(&raw_context, &frame0->context, sizeof(raw_context)));
511 
512   StackFrameARM64 *frame1 = static_cast<StackFrameARM64 *>(frames->at(1));
513   EXPECT_EQ(StackFrame::FRAME_TRUST_FP, frame1->trust);
514   ASSERT_EQ((StackFrameARM64::CONTEXT_VALID_PC |
515              StackFrameARM64::CONTEXT_VALID_LR |
516              StackFrameARM64::CONTEXT_VALID_FP |
517              StackFrameARM64::CONTEXT_VALID_SP),
518             frame1->context_validity);
519   EXPECT_EQ(return_address1, frame1->context.iregs[MD_CONTEXT_ARM64_REG_PC]);
520   EXPECT_EQ(return_address2, frame1->context.iregs[MD_CONTEXT_ARM64_REG_LR]);
521   EXPECT_EQ(frame1_sp.Value(), frame1->context.iregs[MD_CONTEXT_ARM64_REG_SP]);
522   EXPECT_EQ(frame2_fp.Value(),
523             frame1->context.iregs[MD_CONTEXT_ARM64_REG_FP]);
524 
525   StackFrameARM64 *frame2 = static_cast<StackFrameARM64 *>(frames->at(2));
526   EXPECT_EQ(StackFrame::FRAME_TRUST_FP, frame2->trust);
527   ASSERT_EQ((StackFrameARM64::CONTEXT_VALID_PC |
528              StackFrameARM64::CONTEXT_VALID_LR |
529              StackFrameARM64::CONTEXT_VALID_FP |
530              StackFrameARM64::CONTEXT_VALID_SP),
531             frame2->context_validity);
532   EXPECT_EQ(return_address2, frame2->context.iregs[MD_CONTEXT_ARM64_REG_PC]);
533   EXPECT_EQ(0U, frame2->context.iregs[MD_CONTEXT_ARM64_REG_LR]);
534   EXPECT_EQ(frame2_sp.Value(), frame2->context.iregs[MD_CONTEXT_ARM64_REG_SP]);
535   EXPECT_EQ(0U, frame2->context.iregs[MD_CONTEXT_ARM64_REG_FP]);
536 }
537 
538 struct CFIFixture: public StackwalkerARM64Fixture {
CFIFixtureCFIFixture539   CFIFixture() {
540     // Provide a bunch of STACK CFI records; we'll walk to the caller
541     // from every point in this series, expecting to find the same set
542     // of register values.
543     SetModuleSymbols(&module1,
544                      // The youngest frame's function.
545                      "FUNC 4000 1000 10 enchiridion\n"
546                      // Initially, nothing has been pushed on the stack,
547                      // and the return address is still in the link
548                      // register (x30).
549                      "STACK CFI INIT 4000 100 .cfa: sp 0 + .ra: x30\n"
550                      // Push x19, x20, the frame pointer and the link register.
551                      "STACK CFI 4001 .cfa: sp 32 + .ra: .cfa -8 + ^"
552                      " x19: .cfa -32 + ^ x20: .cfa -24 + ^ "
553                      " x29: .cfa -16 + ^\n"
554                      // Save x19..x22 in x0..x3: verify that we populate
555                      // the youngest frame with all the values we have.
556                      "STACK CFI 4002 x19: x0 x20: x1 x21: x2 x22: x3\n"
557                      // Restore x19..x22. Save the non-callee-saves register x1.
558                      "STACK CFI 4003 .cfa: sp 40 + x1: .cfa 40 - ^"
559                      " x19: x19 x20: x20 x21: x21 x22: x22\n"
560                      // Move the .cfa back eight bytes, to point at the return
561                      // address, and restore the sp explicitly.
562                      "STACK CFI 4005 .cfa: sp 32 + x1: .cfa 32 - ^"
563                      " x29: .cfa 8 - ^ .ra: .cfa ^ sp: .cfa 8 +\n"
564                      // Recover the PC explicitly from a new stack slot;
565                      // provide garbage for the .ra.
566                      "STACK CFI 4006 .cfa: sp 40 + pc: .cfa 40 - ^\n"
567 
568                      // The calling function.
569                      "FUNC 5000 1000 10 epictetus\n"
570                      // Mark it as end of stack.
571                      "STACK CFI INIT 5000 1000 .cfa: 0 .ra: 0\n"
572 
573                      // A function whose CFI makes the stack pointer
574                      // go backwards.
575                      "FUNC 6000 1000 20 palinal\n"
576                      "STACK CFI INIT 6000 1000 .cfa: sp 8 - .ra: x30\n"
577 
578                      // A function with CFI expressions that can't be
579                      // evaluated.
580                      "FUNC 7000 1000 20 rhetorical\n"
581                      "STACK CFI INIT 7000 1000 .cfa: moot .ra: ambiguous\n");
582 
583     // Provide some distinctive values for the caller's registers.
584     expected.iregs[MD_CONTEXT_ARM64_REG_PC] = 0x0000000040005510L;
585     expected.iregs[MD_CONTEXT_ARM64_REG_SP] = 0x0000000080000000L;
586     expected.iregs[19] = 0x5e68b5d5b5d55e68L;
587     expected.iregs[20] = 0x34f3ebd1ebd134f3L;
588     expected.iregs[21] = 0x74bca31ea31e74bcL;
589     expected.iregs[22] = 0x16b32dcb2dcb16b3L;
590     expected.iregs[23] = 0x21372ada2ada2137L;
591     expected.iregs[24] = 0x557dbbbbbbbb557dL;
592     expected.iregs[25] = 0x8ca748bf48bf8ca7L;
593     expected.iregs[26] = 0x21f0ab46ab4621f0L;
594     expected.iregs[27] = 0x146732b732b71467L;
595     expected.iregs[28] = 0xa673645fa673645fL;
596     expected.iregs[MD_CONTEXT_ARM64_REG_FP] = 0xe11081128112e110L;
597 
598     // Expect CFI to recover all callee-saves registers. Since CFI is the
599     // only stack frame construction technique we have, aside from the
600     // context frame itself, there's no way for us to have a set of valid
601     // registers smaller than this.
602     expected_validity = (StackFrameARM64::CONTEXT_VALID_PC  |
603                          StackFrameARM64::CONTEXT_VALID_SP  |
604                          StackFrameARM64::CONTEXT_VALID_X19 |
605                          StackFrameARM64::CONTEXT_VALID_X20 |
606                          StackFrameARM64::CONTEXT_VALID_X21 |
607                          StackFrameARM64::CONTEXT_VALID_X22 |
608                          StackFrameARM64::CONTEXT_VALID_X23 |
609                          StackFrameARM64::CONTEXT_VALID_X24 |
610                          StackFrameARM64::CONTEXT_VALID_X25 |
611                          StackFrameARM64::CONTEXT_VALID_X26 |
612                          StackFrameARM64::CONTEXT_VALID_X27 |
613                          StackFrameARM64::CONTEXT_VALID_X28 |
614                          StackFrameARM64::CONTEXT_VALID_FP);
615 
616     // By default, context frames provide all registers, as normal.
617     context_frame_validity = StackFrameARM64::CONTEXT_VALID_ALL;
618 
619     // By default, registers are unchanged.
620     raw_context = expected;
621   }
622 
623   // Walk the stack, using stack_section as the contents of the stack
624   // and raw_context as the current register values. (Set the stack
625   // pointer to the stack's starting address.) Expect two stack
626   // frames; in the older frame, expect the callee-saves registers to
627   // have values matching those in 'expected'.
CheckWalkCFIFixture628   void CheckWalk() {
629     RegionFromSection();
630     raw_context.iregs[MD_CONTEXT_ARM64_REG_SP] = stack_section.start().Value();
631 
632     StackFrameSymbolizer frame_symbolizer(&supplier, &resolver);
633     StackwalkerARM64 walker(&system_info, &raw_context, &stack_region,
634                             &modules, &frame_symbolizer);
635     walker.SetContextFrameValidity(context_frame_validity);
636     vector<const CodeModule*> modules_without_symbols;
637     vector<const CodeModule*> modules_with_corrupt_symbols;
638     ASSERT_TRUE(walker.Walk(&call_stack, &modules_without_symbols,
639                             &modules_with_corrupt_symbols));
640     ASSERT_EQ(0U, modules_without_symbols.size());
641     ASSERT_EQ(0U, modules_with_corrupt_symbols.size());
642     frames = call_stack.frames();
643     ASSERT_EQ(2U, frames->size());
644 
645     StackFrameARM64 *frame0 = static_cast<StackFrameARM64 *>(frames->at(0));
646     EXPECT_EQ(StackFrame::FRAME_TRUST_CONTEXT, frame0->trust);
647     ASSERT_EQ(context_frame_validity, frame0->context_validity);
648     EXPECT_EQ("enchiridion", frame0->function_name);
649     EXPECT_EQ(0x0000000040004000UL, frame0->function_base);
650 
651     StackFrameARM64 *frame1 = static_cast<StackFrameARM64 *>(frames->at(1));
652     EXPECT_EQ(StackFrame::FRAME_TRUST_CFI, frame1->trust);
653     ASSERT_EQ(expected_validity, frame1->context_validity);
654     if (expected_validity & StackFrameARM64::CONTEXT_VALID_X1)
655       EXPECT_EQ(expected.iregs[1], frame1->context.iregs[1]);
656     if (expected_validity & StackFrameARM64::CONTEXT_VALID_X19)
657       EXPECT_EQ(expected.iregs[19], frame1->context.iregs[19]);
658     if (expected_validity & StackFrameARM64::CONTEXT_VALID_X20)
659       EXPECT_EQ(expected.iregs[20], frame1->context.iregs[20]);
660     if (expected_validity & StackFrameARM64::CONTEXT_VALID_X21)
661       EXPECT_EQ(expected.iregs[21], frame1->context.iregs[21]);
662     if (expected_validity & StackFrameARM64::CONTEXT_VALID_X22)
663       EXPECT_EQ(expected.iregs[22], frame1->context.iregs[22]);
664     if (expected_validity & StackFrameARM64::CONTEXT_VALID_X23)
665       EXPECT_EQ(expected.iregs[23], frame1->context.iregs[23]);
666     if (expected_validity & StackFrameARM64::CONTEXT_VALID_X24)
667       EXPECT_EQ(expected.iregs[24], frame1->context.iregs[24]);
668     if (expected_validity & StackFrameARM64::CONTEXT_VALID_X25)
669       EXPECT_EQ(expected.iregs[25], frame1->context.iregs[25]);
670     if (expected_validity & StackFrameARM64::CONTEXT_VALID_X26)
671       EXPECT_EQ(expected.iregs[26], frame1->context.iregs[26]);
672     if (expected_validity & StackFrameARM64::CONTEXT_VALID_X27)
673       EXPECT_EQ(expected.iregs[27], frame1->context.iregs[27]);
674     if (expected_validity & StackFrameARM64::CONTEXT_VALID_X28)
675       EXPECT_EQ(expected.iregs[28], frame1->context.iregs[28]);
676     if (expected_validity & StackFrameARM64::CONTEXT_VALID_FP)
677       EXPECT_EQ(expected.iregs[MD_CONTEXT_ARM64_REG_FP],
678                 frame1->context.iregs[MD_CONTEXT_ARM64_REG_FP]);
679 
680     // We would never have gotten a frame in the first place if the SP
681     // and PC weren't valid or ->instruction weren't set.
682     EXPECT_EQ(expected.iregs[MD_CONTEXT_ARM64_REG_SP],
683               frame1->context.iregs[MD_CONTEXT_ARM64_REG_SP]);
684     EXPECT_EQ(expected.iregs[MD_CONTEXT_ARM64_REG_PC],
685               frame1->context.iregs[MD_CONTEXT_ARM64_REG_PC]);
686     EXPECT_EQ(expected.iregs[MD_CONTEXT_ARM64_REG_PC],
687               frame1->instruction + 4);
688     EXPECT_EQ("epictetus", frame1->function_name);
689   }
690 
691   // The values we expect to find for the caller's registers.
692   MDRawContextARM64 expected;
693 
694   // The validity mask for expected.
695   uint64_t expected_validity;
696 
697   // The validity mask to impose on the context frame.
698   uint64_t context_frame_validity;
699 };
700 
701 class CFI: public CFIFixture, public Test { };
702 
TEST_F(CFI,At4000)703 TEST_F(CFI, At4000) {
704   stack_section.start() = expected.iregs[MD_CONTEXT_ARM64_REG_SP];
705   raw_context.iregs[MD_CONTEXT_ARM64_REG_PC] = 0x0000000040004000L;
706   raw_context.iregs[MD_CONTEXT_ARM64_REG_LR] = 0x0000000040005510L;
707   CheckWalk();
708 }
709 
TEST_F(CFI,At4001)710 TEST_F(CFI, At4001) {
711   Label frame1_sp = expected.iregs[MD_CONTEXT_ARM64_REG_SP];
712   stack_section
713     .D64(0x5e68b5d5b5d55e68L)   // saved x19
714     .D64(0x34f3ebd1ebd134f3L)   // saved x20
715     .D64(0xe11081128112e110L)   // saved fp
716     .D64(0x0000000040005510L)   // return address
717     .Mark(&frame1_sp);          // This effectively sets stack_section.start().
718   raw_context.iregs[MD_CONTEXT_ARM64_REG_PC] = 0x0000000040004001L;
719   // distinct callee x19, x20 and fp
720   raw_context.iregs[19] = 0xadc9f635a635adc9L;
721   raw_context.iregs[20] = 0x623135ac35ac6231L;
722   raw_context.iregs[MD_CONTEXT_ARM64_REG_FP] = 0x5fc4be14be145fc4L;
723   CheckWalk();
724 }
725 
726 // As above, but unwind from a context that has only the PC and SP.
TEST_F(CFI,At4001LimitedValidity)727 TEST_F(CFI, At4001LimitedValidity) {
728   Label frame1_sp = expected.iregs[MD_CONTEXT_ARM64_REG_SP];
729   stack_section
730     .D64(0x5e68b5d5b5d55e68L)   // saved x19
731     .D64(0x34f3ebd1ebd134f3L)   // saved x20
732     .D64(0xe11081128112e110L)   // saved fp
733     .D64(0x0000000040005510L)   // return address
734     .Mark(&frame1_sp);          // This effectively sets stack_section.start().
735   context_frame_validity =
736     StackFrameARM64::CONTEXT_VALID_PC | StackFrameARM64::CONTEXT_VALID_SP;
737   raw_context.iregs[MD_CONTEXT_ARM64_REG_PC] = 0x0000000040004001L;
738   raw_context.iregs[MD_CONTEXT_ARM64_REG_FP] = 0x5fc4be14be145fc4L;
739 
740   expected_validity = (StackFrameARM64::CONTEXT_VALID_PC
741                        | StackFrameARM64::CONTEXT_VALID_SP
742                        | StackFrameARM64::CONTEXT_VALID_FP
743                        | StackFrameARM64::CONTEXT_VALID_X19
744                        | StackFrameARM64::CONTEXT_VALID_X20);
745   CheckWalk();
746 }
747 
TEST_F(CFI,At4002)748 TEST_F(CFI, At4002) {
749   Label frame1_sp = expected.iregs[MD_CONTEXT_ARM64_REG_SP];
750   stack_section
751     .D64(0xff3dfb81fb81ff3dL)   // no longer saved x19
752     .D64(0x34f3ebd1ebd134f3L)   // no longer saved x20
753     .D64(0xe11081128112e110L)   // saved fp
754     .D64(0x0000000040005510L)   // return address
755     .Mark(&frame1_sp);          // This effectively sets stack_section.start().
756   raw_context.iregs[MD_CONTEXT_ARM64_REG_PC] = 0x0000000040004002L;
757   raw_context.iregs[0]  = 0x5e68b5d5b5d55e68L;  // saved x19
758   raw_context.iregs[1]  = 0x34f3ebd1ebd134f3L;  // saved x20
759   raw_context.iregs[2]  = 0x74bca31ea31e74bcL;  // saved x21
760   raw_context.iregs[3]  = 0x16b32dcb2dcb16b3L;  // saved x22
761   raw_context.iregs[19] = 0xadc9f635a635adc9L;  // distinct callee x19
762   raw_context.iregs[20] = 0x623135ac35ac6231L;  // distinct callee x20
763   raw_context.iregs[21] = 0xac4543564356ac45L;  // distinct callee x21
764   raw_context.iregs[22] = 0x2561562f562f2561L;  // distinct callee x22
765   // distinct callee fp
766   raw_context.iregs[MD_CONTEXT_ARM64_REG_FP] = 0x5fc4be14be145fc4L;
767   CheckWalk();
768 }
769 
TEST_F(CFI,At4003)770 TEST_F(CFI, At4003) {
771   Label frame1_sp = expected.iregs[MD_CONTEXT_ARM64_REG_SP];
772   stack_section
773     .D64(0xdd5a48c848c8dd5aL)   // saved x1 (even though it's not callee-saves)
774     .D64(0xff3dfb81fb81ff3dL)   // no longer saved x19
775     .D64(0x34f3ebd1ebd134f3L)   // no longer saved x20
776     .D64(0xe11081128112e110L)   // saved fp
777     .D64(0x0000000040005510L)   // return address
778     .Mark(&frame1_sp);          // This effectively sets stack_section.start().
779   raw_context.iregs[MD_CONTEXT_ARM64_REG_PC] = 0x0000000040004003L;
780   // distinct callee x1 and fp
781   raw_context.iregs[1] = 0xfb756319fb756319L;
782   raw_context.iregs[MD_CONTEXT_ARM64_REG_FP] = 0x5fc4be14be145fc4L;
783   // caller's x1
784   expected.iregs[1] = 0xdd5a48c848c8dd5aL;
785   expected_validity |= StackFrameARM64::CONTEXT_VALID_X1;
786   CheckWalk();
787 }
788 
789 // We have no new rule at module offset 0x4004, so the results here should
790 // be the same as those at module offset 0x4003.
TEST_F(CFI,At4004)791 TEST_F(CFI, At4004) {
792   Label frame1_sp = expected.iregs[MD_CONTEXT_ARM64_REG_SP];
793   stack_section
794     .D64(0xdd5a48c848c8dd5aL)   // saved x1 (even though it's not callee-saves)
795     .D64(0xff3dfb81fb81ff3dL)   // no longer saved x19
796     .D64(0x34f3ebd1ebd134f3L)   // no longer saved x20
797     .D64(0xe11081128112e110L)   // saved fp
798     .D64(0x0000000040005510L)   // return address
799     .Mark(&frame1_sp);          // This effectively sets stack_section.start().
800   raw_context.iregs[MD_CONTEXT_ARM64_REG_PC] = 0x0000000040004004L;
801   // distinct callee x1 and fp
802   raw_context.iregs[1] = 0xfb756319fb756319L;
803   raw_context.iregs[MD_CONTEXT_ARM64_REG_FP] = 0x5fc4be14be145fc4L;
804   // caller's x1
805   expected.iregs[1] = 0xdd5a48c848c8dd5aL;
806   expected_validity |= StackFrameARM64::CONTEXT_VALID_X1;
807   CheckWalk();
808 }
809 
810 // Here we move the .cfa, but provide an explicit rule to recover the SP,
811 // so again there should be no change in the registers recovered.
TEST_F(CFI,At4005)812 TEST_F(CFI, At4005) {
813   Label frame1_sp = expected.iregs[MD_CONTEXT_ARM64_REG_SP];
814   stack_section
815     .D64(0xdd5a48c848c8dd5aL)   // saved x1 (even though it's not callee-saves)
816     .D64(0xff3dfb81fb81ff3dL)   // no longer saved x19
817     .D64(0x34f3ebd1ebd134f3L)   // no longer saved x20
818     .D64(0xe11081128112e110L)   // saved fp
819     .D64(0x0000000040005510L)   // return address
820     .Mark(&frame1_sp);          // This effectively sets stack_section.start().
821   raw_context.iregs[MD_CONTEXT_ARM64_REG_PC] = 0x0000000040004005L;
822   raw_context.iregs[1] = 0xfb756319fb756319L;  // distinct callee x1
823   expected.iregs[1] = 0xdd5a48c848c8dd5aL;     // caller's x1
824   expected_validity |= StackFrameARM64::CONTEXT_VALID_X1;
825   CheckWalk();
826 }
827 
828 // Here we provide an explicit rule for the PC, and have the saved .ra be
829 // bogus.
TEST_F(CFI,At4006)830 TEST_F(CFI, At4006) {
831   Label frame1_sp = expected.iregs[MD_CONTEXT_ARM64_REG_SP];
832   stack_section
833     .D64(0x0000000040005510L)   // saved pc
834     .D64(0xdd5a48c848c8dd5aL)   // saved x1 (even though it's not callee-saves)
835     .D64(0xff3dfb81fb81ff3dL)   // no longer saved x19
836     .D64(0x34f3ebd1ebd134f3L)   // no longer saved x20
837     .D64(0xe11081128112e110L)   // saved fp
838     .D64(0xf8d157835783f8d1L)   // .ra rule recovers this, which is garbage
839     .Mark(&frame1_sp);          // This effectively sets stack_section.start().
840   raw_context.iregs[MD_CONTEXT_ARM64_REG_PC] = 0x0000000040004006L;
841   raw_context.iregs[1] = 0xfb756319fb756319L;  // distinct callee x1
842   expected.iregs[1] = 0xdd5a48c848c8dd5aL;     // caller's x1
843   expected_validity |= StackFrameARM64::CONTEXT_VALID_X1;
844   CheckWalk();
845 }
846 
847 // Check that we reject rules that would cause the stack pointer to
848 // move in the wrong direction.
TEST_F(CFI,RejectBackwards)849 TEST_F(CFI, RejectBackwards) {
850   raw_context.iregs[MD_CONTEXT_ARM64_REG_PC] = 0x0000000040006000L;
851   raw_context.iregs[MD_CONTEXT_ARM64_REG_SP] = 0x0000000080000000L;
852   raw_context.iregs[MD_CONTEXT_ARM64_REG_LR] = 0x0000000040005510L;
853   StackFrameSymbolizer frame_symbolizer(&supplier, &resolver);
854   StackwalkerARM64 walker(&system_info, &raw_context, &stack_region, &modules,
855                           &frame_symbolizer);
856   vector<const CodeModule*> modules_without_symbols;
857   vector<const CodeModule*> modules_with_corrupt_symbols;
858   ASSERT_TRUE(walker.Walk(&call_stack, &modules_without_symbols,
859                           &modules_with_corrupt_symbols));
860   ASSERT_EQ(0U, modules_without_symbols.size());
861   ASSERT_EQ(0U, modules_with_corrupt_symbols.size());
862   frames = call_stack.frames();
863   ASSERT_EQ(1U, frames->size());
864 }
865 
866 // Check that we reject rules whose expressions' evaluation fails.
TEST_F(CFI,RejectBadExpressions)867 TEST_F(CFI, RejectBadExpressions) {
868   raw_context.iregs[MD_CONTEXT_ARM64_REG_PC] = 0x0000000040007000L;
869   raw_context.iregs[MD_CONTEXT_ARM64_REG_SP] = 0x0000000080000000L;
870   StackFrameSymbolizer frame_symbolizer(&supplier, &resolver);
871   StackwalkerARM64 walker(&system_info, &raw_context, &stack_region, &modules,
872                           &frame_symbolizer);
873   vector<const CodeModule*> modules_without_symbols;
874   vector<const CodeModule*> modules_with_corrupt_symbols;
875   ASSERT_TRUE(walker.Walk(&call_stack, &modules_without_symbols,
876                           &modules_with_corrupt_symbols));
877   ASSERT_EQ(0U, modules_without_symbols.size());
878   ASSERT_EQ(0U, modules_with_corrupt_symbols.size());
879   frames = call_stack.frames();
880   ASSERT_EQ(1U, frames->size());
881 }
882