mac-arm64: Set expectations for tests that crash via __builtin_trap

__builtin_trap uses ud2 on x86_64, producing a SIGILL. On arm64, it uses
brk #1, producing a SIGTRAP. Test expectations must be adjusted
accordingly.

Bug: crashpad:345
Test: crashpad_snapshot_test MachOImageAnnotationsReader.CrashModuleInitialization, crashpad_util_test ExcServerVariants.*,ExceptionPorts.*
Change-Id: I22e75b7b48b8887031b1d95f1cea8a09733daf49
Reviewed-on: https://chromium-review.googlesource.com/c/crashpad/crashpad/+/2386464
Commit-Queue: Mark Mentovai <[email protected]>
Reviewed-by: Robert Sesek <[email protected]>

Author: markmentovai

snapshot/mac/mach_o_image_annotations_reader_test.cc

@@ -112,9 +112,7 @@ class TestMachOImageAnnotationsReader final
         break;
 
       case kCrashModuleInitialization:
-        // This crash is triggered by __builtin_trap(), which shows up as
-        // SIGILL.
-        SetExpectedChildTermination(kTerminationSignal, SIGILL);
+        SetExpectedChildTerminationBuiltinTrap();
         break;
 
       case kCrashDyld:

util/mach/exc_server_variants_test.cc

@@ -975,8 +975,7 @@ class TestExcServerVariants : public MachMultiprocess,
         flavor_(flavor),
         state_count_(state_count),
         handled_(false) {
-    // This is how the __builtin_trap() in MachMultiprocessChild() appears.
-    SetExpectedChildTermination(kTerminationSignal, SIGILL);
+    SetExpectedChildTerminationBuiltinTrap();
   }
 
   // UniversalMachExcServer::Interface:

util/mach/exception_ports_test.cc

@@ -25,6 +25,7 @@
 #include "base/macros.h"
 #include "base/notreached.h"
 #include "base/strings/stringprintf.h"
+#include "build/build_config.h"
 #include "gtest/gtest.h"
 #include "test/mac/mach_errors.h"
 #include "test/mac/mach_multiprocess.h"
@@ -145,8 +146,7 @@ class TestExceptionPorts : public MachMultiprocess,
         who_crashes_(who_crashes),
         handled_(false) {
     if (who_crashes_ != kNobodyCrashes) {
-      // This is how the __builtin_trap() in Child::Crash() appears.
-      SetExpectedChildTermination(kTerminationSignal, SIGILL);
+      SetExpectedChildTerminationBuiltinTrap();
     }
   }
 
@@ -205,8 +205,14 @@ class TestExceptionPorts : public MachMultiprocess,
       int signal;
       ExcCrashRecoverOriginalException(code[0], nullptr, &signal);
 
-      // The child crashed with __builtin_trap(), which shows up as SIGILL.
-      EXPECT_EQ(signal, SIGILL);
+#if defined(ARCH_CPU_X86_FAMILY)
+      constexpr int kBuiltinTrapSignal = SIGILL;
+#elif defined(ARCH_CPU_ARM64)
+      constexpr int kBuiltinTrapSignal = SIGTRAP;
+#else
+#error Port
+#endif
+      EXPECT_EQ(signal, kBuiltinTrapSignal);
     }
 
     EXPECT_EQ(AuditPIDFromMachMessageTrailer(trailer), 0);