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// Copyright 2017 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include "cpuinfo_arm.h"
#include <assert.h>
#include <ctype.h>
#include "internal/bit_utils.h"
#include "internal/filesystem.h"
#include "internal/hwcaps.h"
#include "internal/stack_line_reader.h"
#include "internal/string_view.h"
// Generation of feature's getters/setters functions and kGetters, kSetters,
// kCpuInfoFlags and kHardwareCapabilities global tables.
#define DEFINE_TABLE_FEATURES \
FEATURE(ARM_SWP, swp, "swp", ARM_HWCAP_SWP, 0) \
FEATURE(ARM_HALF, half, "half", ARM_HWCAP_HALF, 0) \
FEATURE(ARM_THUMB, thumb, "thumb", ARM_HWCAP_THUMB, 0) \
FEATURE(ARM_26BIT, _26bit, "26bit", ARM_HWCAP_26BIT, 0) \
FEATURE(ARM_FASTMULT, fastmult, "fastmult", ARM_HWCAP_FAST_MULT, 0) \
FEATURE(ARM_FPA, fpa, "fpa", ARM_HWCAP_FPA, 0) \
FEATURE(ARM_VFP, vfp, "vfp", ARM_HWCAP_VFP, 0) \
FEATURE(ARM_EDSP, edsp, "edsp", ARM_HWCAP_EDSP, 0) \
FEATURE(ARM_JAVA, java, "java", ARM_HWCAP_JAVA, 0) \
FEATURE(ARM_IWMMXT, iwmmxt, "iwmmxt", ARM_HWCAP_IWMMXT, 0) \
FEATURE(ARM_CRUNCH, crunch, "crunch", ARM_HWCAP_CRUNCH, 0) \
FEATURE(ARM_THUMBEE, thumbee, "thumbee", ARM_HWCAP_THUMBEE, 0) \
FEATURE(ARM_NEON, neon, "neon", ARM_HWCAP_NEON, 0) \
FEATURE(ARM_VFPV3, vfpv3, "vfpv3", ARM_HWCAP_VFPV3, 0) \
FEATURE(ARM_VFPV3D16, vfpv3d16, "vfpv3d16", ARM_HWCAP_VFPV3D16, 0) \
FEATURE(ARM_TLS, tls, "tls", ARM_HWCAP_TLS, 0) \
FEATURE(ARM_VFPV4, vfpv4, "vfpv4", ARM_HWCAP_VFPV4, 0) \
FEATURE(ARM_IDIVA, idiva, "idiva", ARM_HWCAP_IDIVA, 0) \
FEATURE(ARM_IDIVT, idivt, "idivt", ARM_HWCAP_IDIVT, 0) \
FEATURE(ARM_VFPD32, vfpd32, "vfpd32", ARM_HWCAP_VFPD32, 0) \
FEATURE(ARM_LPAE, lpae, "lpae", ARM_HWCAP_LPAE, 0) \
FEATURE(ARM_EVTSTRM, evtstrm, "evtstrm", ARM_HWCAP_EVTSTRM, 0) \
FEATURE(ARM_AES, aes, "aes", 0, ARM_HWCAP2_AES) \
FEATURE(ARM_PMULL, pmull, "pmull", 0, ARM_HWCAP2_PMULL) \
FEATURE(ARM_SHA1, sha1, "sha1", 0, ARM_HWCAP2_SHA1) \
FEATURE(ARM_SHA2, sha2, "sha2", 0, ARM_HWCAP2_SHA2) \
FEATURE(ARM_CRC32, crc32, "crc32", 0, ARM_HWCAP2_CRC32)
#define DEFINE_TABLE_FEATURE_TYPE ArmFeatures
#include "define_tables.h"
typedef struct {
bool processor_reports_armv6;
bool hardware_reports_goldfish;
} ProcCpuInfoData;
static int IndexOfNonDigit(StringView str) {
size_t index = 0;
while (str.size && isdigit(CpuFeatures_StringView_Front(str))) {
str = CpuFeatures_StringView_PopFront(str, 1);
++index;
}
return index;
}
static bool HandleArmLine(const LineResult result, ArmInfo* const info,
ProcCpuInfoData* const proc_info) {
StringView line = result.line;
StringView key, value;
if (CpuFeatures_StringView_GetAttributeKeyValue(line, &key, &value)) {
if (CpuFeatures_StringView_IsEquals(key, str("Features"))) {
for (size_t i = 0; i < ARM_LAST_; ++i) {
kSetters[i](&info->features,
CpuFeatures_StringView_HasWord(value, kCpuInfoFlags[i]));
}
} else if (CpuFeatures_StringView_IsEquals(key, str("CPU implementer"))) {
info->implementer = CpuFeatures_StringView_ParsePositiveNumber(value);
} else if (CpuFeatures_StringView_IsEquals(key, str("CPU variant"))) {
info->variant = CpuFeatures_StringView_ParsePositiveNumber(value);
} else if (CpuFeatures_StringView_IsEquals(key, str("CPU part"))) {
info->part = CpuFeatures_StringView_ParsePositiveNumber(value);
} else if (CpuFeatures_StringView_IsEquals(key, str("CPU revision"))) {
info->revision = CpuFeatures_StringView_ParsePositiveNumber(value);
} else if (CpuFeatures_StringView_IsEquals(key, str("CPU architecture"))) {
// CPU architecture is a number that may be followed by letters. e.g.
// "6TEJ", "7".
const StringView digits =
CpuFeatures_StringView_KeepFront(value, IndexOfNonDigit(value));
info->architecture = CpuFeatures_StringView_ParsePositiveNumber(digits);
} else if (CpuFeatures_StringView_IsEquals(key, str("Processor")) ||
CpuFeatures_StringView_IsEquals(key, str("model name"))) {
// Android reports this in a non-Linux standard "Processor" but sometimes
// also in "model name", Linux reports it only in "model name"
// see RaspberryPiZero (Linux) vs InvalidArmv7 (Android) test-cases
proc_info->processor_reports_armv6 =
CpuFeatures_StringView_IndexOf(value, str("(v6l)")) >= 0;
} else if (CpuFeatures_StringView_IsEquals(key, str("Hardware"))) {
proc_info->hardware_reports_goldfish =
CpuFeatures_StringView_IsEquals(value, str("Goldfish"));
}
}
return !result.eof;
}
uint32_t GetArmCpuId(const ArmInfo* const info) {
return (ExtractBitRange(info->implementer, 7, 0) << 24) |
(ExtractBitRange(info->variant, 3, 0) << 20) |
(ExtractBitRange(info->part, 11, 0) << 4) |
(ExtractBitRange(info->revision, 3, 0) << 0);
}
static void FixErrors(ArmInfo* const info,
ProcCpuInfoData* const proc_cpu_info_data) {
// Fixing Samsung kernel reporting invalid cpu architecture.
// http://code.google.com/p/android/issues/detail?id=10812
if (proc_cpu_info_data->processor_reports_armv6 && info->architecture >= 7) {
info->architecture = 6;
}
// Handle kernel configuration bugs that prevent the correct reporting of CPU
// features.
switch (GetArmCpuId(info)) {
case 0x4100C080:
// Special case: The emulator-specific Android 4.2 kernel fails to report
// support for the 32-bit ARM IDIV instruction. Technically, this is a
// feature of the virtual CPU implemented by the emulator. Note that it
// could also support Thumb IDIV in the future, and this will have to be
// slightly updated.
if (info->architecture >= 7 &&
proc_cpu_info_data->hardware_reports_goldfish) {
info->features.idiva = true;
}
break;
case 0x511004D0:
// https://crbug.com/341598.
info->features.neon = false;
break;
case 0x510006F2:
case 0x510006F3:
// The Nexus 4 (Qualcomm Krait) kernel configuration forgets to report
// IDIV support.
info->features.idiva = true;
info->features.idivt = true;
break;
}
// Propagate cpu features.
if (info->features.vfpv4) info->features.vfpv3 = true;
if (info->features.neon) info->features.vfpv3 = true;
if (info->features.vfpv3) info->features.vfp = true;
}
static void FillProcCpuInfoData(ArmInfo* const info,
ProcCpuInfoData* proc_cpu_info_data) {
const int fd = CpuFeatures_OpenFile("/proc/cpuinfo");
if (fd >= 0) {
StackLineReader reader;
StackLineReader_Initialize(&reader, fd);
for (;;) {
if (!HandleArmLine(StackLineReader_NextLine(&reader), info,
proc_cpu_info_data)) {
break;
}
}
CpuFeatures_CloseFile(fd);
}
}
static const ArmInfo kEmptyArmInfo;
static const ProcCpuInfoData kEmptyProcCpuInfoData;
ArmInfo GetArmInfo(void) {
// capabilities are fetched from both getauxval and /proc/cpuinfo so we can
// have some information if the executable is sandboxed (aka no access to
// /proc/cpuinfo).
ArmInfo info = kEmptyArmInfo;
ProcCpuInfoData proc_cpu_info_data = kEmptyProcCpuInfoData;
FillProcCpuInfoData(&info, &proc_cpu_info_data);
const HardwareCapabilities hwcaps = CpuFeatures_GetHardwareCapabilities();
for (size_t i = 0; i < ARM_LAST_; ++i) {
if (CpuFeatures_IsHwCapsSet(kHardwareCapabilities[i], hwcaps)) {
kSetters[i](&info.features, true);
}
}
FixErrors(&info, &proc_cpu_info_data);
return info;
}
////////////////////////////////////////////////////////////////////////////////
// Introspection functions
int GetArmFeaturesEnumValue(const ArmFeatures* features,
ArmFeaturesEnum value) {
if (value >= ARM_LAST_) return false;
return kGetters[value](features);
}
const char* GetArmFeaturesEnumName(ArmFeaturesEnum value) {
if (value >= ARM_LAST_) return "unknown feature";
return kCpuInfoFlags[value];
}
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