| // 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]; |
| } |
