Move CPU features into its own static library.

src/trusted/validator_arm/cpuid_arm.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.
- */
-
-#include <string.h>
-
-#include "native_client/src/shared/platform/nacl_log.h"
-#include "native_client/src/trusted/validator_arm/cpuid_arm.h"
-
-
-void NaClSetAllCPUFeaturesArm(NaClCPUFeatures *f) {
-  /* TODO(jfb) Use a safe cast in this interface. */
-  NaClCPUFeaturesArm *features = (NaClCPUFeaturesArm *) f;
-  /* Pedantic: avoid using memset, as in x86's nacl_cpuid.c. */
-  int id;
-  /* Ensure any padding is zeroed. */
-  NaClClearCPUFeaturesArm(features);
-  for (id = 0; id < NaClCPUFeatureArm_Max; ++id) {
-    NaClSetCPUFeatureArm(features, id, 1);
-  }
-}
-
-void NaClGetCurrentCPUFeaturesArm(NaClCPUFeatures *f) {
-  /* TODO(jfb) Use a safe cast in this interface. */
-  NaClCPUFeaturesArm *features = (NaClCPUFeaturesArm *) f;
-  /*
-   * TODO(jfb) Create a whitelist of CPUs that don't leak information when
-   *           TST+LDR and TST+STR are used. Disallow all for now.
-   */
-  NaClSetCPUFeatureArm(features, NaClCPUFeatureArm_CanUseTstMem, 0);
-}
-
-/* This array defines the CPU feature model for fixed-feature CPU mode. */
-static const int kFixedFeatureArmCPUModel[NaClCPUFeatureArm_Max] = {
-  0 /* NaClCPUFeatureArm_CanUseTstMem */
-};
-
-int NaClFixCPUFeaturesArm(NaClCPUFeatures *f) {
-  /* TODO(jfb) Use a safe cast in this interface. */
-  NaClCPUFeaturesArm *features = (NaClCPUFeaturesArm *) f;
-  NaClCPUFeatureArmID fid;
-  int rvalue = 1;
-
-  for (fid = 0; fid < NaClCPUFeatureArm_Max; fid++) {
-    if (kFixedFeatureArmCPUModel[fid]) {
-      if (!NaClGetCPUFeatureArm(features, fid)) {
-        /* This CPU is missing a required feature. */
-        NaClLog(LOG_ERROR,
-                "This CPU is missing a feature required by fixed-mode: %s\n",
-                NaClGetCPUFeatureArmName(fid));
-        rvalue = 0;  /* set return value to indicate failure */
-      }
-    } else {
-      /* Feature is not in the fixed model.
-       * Ensure cpu_features does not have it either.
-       */
-      NaClSetCPUFeatureArm(features, fid, 0);
-    }
-  }
-  return rvalue;
-}
-
-void NaClSetCPUFeatureArm(NaClCPUFeaturesArm *f, NaClCPUFeatureArmID id,
-                          int state) {
-  f->data[id] = (char) state;
-}
-
-const char *NaClGetCPUFeatureArmName(NaClCPUFeatureArmID id) {
-  static const char *kFeatureArmNames[NaClCPUFeatureArm_Max] = {
-# define NACL_ARM_CPU_FEATURE(name) NACL_TO_STRING(name),
-# include "native_client/src/trusted/validator_arm/cpuid_arm_features.h"
-# undef NACL_ARM_CPU_FEATURE
-  };
-  return ((unsigned)id < NaClCPUFeatureArm_Max) ?
-      kFeatureArmNames[id] : "INVALID";
-}
-
-void NaClClearCPUFeaturesArm(NaClCPUFeaturesArm *features) {
-  memset(features, 0, sizeof(*features));
-}
-
-void NaClCopyCPUFeaturesArm(NaClCPUFeaturesArm *target,
-                            const NaClCPUFeaturesArm *source) {
-  memcpy(target, source, sizeof(*target));
-}