enable //test/syscalls:proc_test support on Arm64

Problems with different platform architectures have been solved.

Signed-off-by: Bin Lu <bin.lu@arm.com>

test/syscalls/linux/proc.cc

@@ -102,7 +102,55 @@ namespace {
 
 // O_LARGEFILE as defined by Linux. glibc tries to be clever by setting it to 0
 // because "it isn't needed", even though Linux can return it via F_GETFL.
+#if defined(__x86_64__) || defined(__i386__)
 constexpr int kOLargeFile = 00100000;
+#elif __aarch64__
+// The value originate from the Linux
+// kernel's arch/arm64/include/uapi/asm/fcntl.h.
+constexpr int kOLargeFile = 00400000;
+#else
+#error "Unknown architecture"
+#endif
+
+#if defined(__x86_64__) || defined(__i386__)
+  // This list of "required" fields is taken from reading the file
+  // arch/x86/kernel/cpu/proc.c and seeing which fields will be unconditionally
+  // printed by the kernel.
+  static const char* required_fields[] = {
+      "processor",
+      "vendor_id",
+      "cpu family",
+      "model\t\t:",
+      "model name",
+      "stepping",
+      "cpu MHz",
+      "fpu\t\t:",
+      "fpu_exception",
+      "cpuid level",
+      "wp",
+      "bogomips",
+      "clflush size",
+      "cache_alignment",
+      "address sizes",
+      "power management",
+  };
+#elif __aarch64__
+  // This list of "required" fields is taken from reading the file
+  // arch/arm64/kernel/cpuinfo.c and seeing which fields will be unconditionally
+  // printed by the kernel.
+  static const char* required_fields[] = {
+      "processor",
+      "BogoMIPS",
+      "Features",
+      "CPU implementer",
+      "CPU architecture",
+      "CPU variant",
+      "CPU part",
+      "CPU revision",
+  };
+#else
+#error "Unknown architecture"
+#endif
 
 // Takes the subprocess command line and pid.
 // If it returns !OK, WithSubprocess returns immediately.
@@ -717,28 +765,6 @@ TEST(ProcCpuinfo, RequiredFieldsArePresent) {
   ASSERT_FALSE(proc_cpuinfo.empty());
   std::vector<std::string> cpuinfo_fields = absl::StrSplit(proc_cpuinfo, '\n');
 
-  // This list of "required" fields is taken from reading the file
-  // arch/x86/kernel/cpu/proc.c and seeing which fields will be unconditionally
-  // printed by the kernel.
-  static const char* required_fields[] = {
-      "processor",
-      "vendor_id",
-      "cpu family",
-      "model\t\t:",
-      "model name",
-      "stepping",
-      "cpu MHz",
-      "fpu\t\t:",
-      "fpu_exception",
-      "cpuid level",
-      "wp",
-      "bogomips",
-      "clflush size",
-      "cache_alignment",
-      "address sizes",
-      "power management",
-  };
-
   // Check that the usual fields are there. We don't really care about the
   // contents.
   for (const std::string& field : required_fields) {