Support symbol dumping for ARMV8 iOS apps.

In my testing, ARM V8 object files and ARM V8 slices of universal binaries do
not contain debug_frame sections (at least at this time), and hence dump_syms
does not output CFI for ARM V8 even in the absence of the "-c" flag.

Patch by:blundell@chromium.org

BUG=542
R=qsr@chromium.org

Review URL: https://breakpad.appspot.com/642002

git-svn-id: http://google-breakpad.googlecode.com/svn/trunk@1222 4c0a9323-5329-0410-9bdc-e9ce6186880e

src/common/mac/arch_utilities.cc

@@ -45,8 +45,27 @@
 #define CPU_SUBTYPE_ARM_V7S (static_cast<cpu_subtype_t>(11))
 #endif  // CPU_SUBTYPE_ARM_V7S
 
+#ifndef CPU_TYPE_ARM64
+#define CPU_TYPE_ARM64 (static_cast<cpu_type_t>(16777228))
+#endif  // CPU_TYPE_ARM64
+
+#ifndef CPU_SUBTYPE_ARM64_ALL
+#define CPU_SUBTYPE_ARM64_ALL (static_cast<cpu_type_t>(0))
+#endif  // CPU_SUBTYPE_ARM64_ALL
+
 namespace {
 
+const NXArchInfo* ArchInfo_arm64() {
+  NXArchInfo* arm64 = new NXArchInfo;
+  *arm64 = *NXGetArchInfoFromCpuType(CPU_TYPE_ARM,
+                                     CPU_SUBTYPE_ARM_V7);
+  arm64->name = "arm64";
+  arm64->cputype = CPU_TYPE_ARM64;
+  arm64->cpusubtype = CPU_SUBTYPE_ARM64_ALL;
+  arm64->description = "arm 64";
+  return arm64;
+}
+
 const NXArchInfo* ArchInfo_armv7s() {
   NXArchInfo* armv7s = new NXArchInfo;
   *armv7s = *NXGetArchInfoFromCpuType(CPU_TYPE_ARM,
@@ -62,19 +81,32 @@ const NXArchInfo* ArchInfo_armv7s() {
 namespace google_breakpad {
 
 const NXArchInfo* BreakpadGetArchInfoFromName(const char* arch_name) {
+  // TODO: Remove this when the OS knows about arm64.
+  if (!strcmp("arm64", arch_name))
+    return BreakpadGetArchInfoFromCpuType(CPU_TYPE_ARM64,
+                                          CPU_SUBTYPE_ARM64_ALL);
+
   // TODO: Remove this when the OS knows about armv7s.
   if (!strcmp("armv7s", arch_name))
     return BreakpadGetArchInfoFromCpuType(CPU_TYPE_ARM, CPU_SUBTYPE_ARM_V7S);
+
   return NXGetArchInfoFromName(arch_name);
 }
 
 const NXArchInfo* BreakpadGetArchInfoFromCpuType(cpu_type_t cpu_type,
                                                  cpu_subtype_t cpu_subtype) {
+  // TODO: Remove this when the OS knows about arm64.
+  if (cpu_type == CPU_TYPE_ARM64 && cpu_subtype == CPU_SUBTYPE_ARM64_ALL) {
+    static const NXArchInfo* arm64 = ArchInfo_arm64();
+    return arm64;
+  }
+
   // TODO: Remove this when the OS knows about armv7s.
   if (cpu_type == CPU_TYPE_ARM && cpu_subtype == CPU_SUBTYPE_ARM_V7S) {
     static const NXArchInfo* armv7s = ArchInfo_armv7s();
     return armv7s;
   }
+
   return NXGetArchInfoFromCpuType(cpu_type, cpu_subtype);
 }
 

src/common/mac/macho_reader.cc

@@ -43,6 +43,10 @@
 #define CPU_TYPE_ARM 12
 #endif
 
+#if !defined(CPU_TYPE_ARM_64)
+#define CPU_TYPE_ARM_64 16777228
+#endif
+
 namespace google_breakpad {
 namespace mach_o {
 
@@ -242,6 +246,7 @@ bool Reader::Read(const uint8_t *buffer,
       case CPU_TYPE_POWERPC:
         expected_magic = MH_MAGIC;
         break;
+      case CPU_TYPE_ARM_64:
       case CPU_TYPE_X86_64:
         expected_magic = MH_CIGAM_64;
         break;