validator_ragel: Link into TCB, use under env var

src/trusted/validator_ragel/unreviewed/dfa_validate_32.c

+/*
+ * Copyright (c) 2012 The Native Client Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+/* Implement the ApplyDfaValidator API for the x86-32 architecture. */
+#include <assert.h>
+#include "native_client/src/shared/platform/nacl_log.h"
+#include "native_client/src/trusted/validator/ncvalidate.h"
+#include "native_client/src/trusted/validator/validation_cache.h"
+#include "native_client/src/trusted/validator_ragel/unreviewed/validator.h"
+
+/* Be sure the correct compile flags are defined for this. */
+#if NACL_ARCH(NACL_TARGET_ARCH) != NACL_x86
+# error("Can't compile, target is for x86-32")
+#else
+# if NACL_TARGET_SUBARCH != 32
+#  error("Can't compile, target is for x86-32")
+# endif
+#endif
+
+
+static void ProcessError(const uint8_t *ptr, void *userdata) {
+  UNREFERENCED_PARAMETER(ptr);
+  UNREFERENCED_PARAMETER(userdata);
+}
+
+NaClValidationStatus NACL_SUBARCH_NAME(ApplyDfaValidator, x86, 32) (
+    uintptr_t guest_addr,
+    uint8_t *data,
+    size_t size,
+    int stubout_mode,
+    int readonly_text,
+    const NaClCPUFeaturesX86 *cpu_features,
+    struct NaClValidationCache *cache) {
+  UNREFERENCED_PARAMETER(guest_addr);
+  UNREFERENCED_PARAMETER(cache);
+
+  if (stubout_mode || readonly_text) {
+    return NaClValidationFailedNotImplemented;
+  }
+  if (!NaClArchSupported(cpu_features)) {
+    return NaClValidationFailedCpuNotSupported;
+  }
+  if (ValidateChunkIA32(data, size, ProcessError, 0) == 0) {
+    return NaClValidationSucceeded;
+  }
+  return NaClValidationFailed;
+}