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Currently running official dart `linux/arm/v7` container image on x86_64 with QEMU results in `Unrecognized ARM CPU architecture`. This is due to QEMU reporting host `/proc/cpuinfo` instead of the emulated architecture. Checking `uname` in addition to `/proc/cpuinfo` would make `linux/arm/v7` build work consistently regardless of whether `--use-qemu` is supplied during SDK build time. TEST=running the qemu bot TEST=ran the ffi/hardfp_test.dart locally both in AOT and JIT mode. Closes https://github.com/dart-lang/sdk/pull/48665 https://github.com/dart-lang/sdk/pull/48665 GitOrigin-RevId: d1414d747152d048f3ecaadfd0cd3356ce7a2205 Change-Id: If8b42a700d55e83fea0ee0035848308a3211ec43 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/238841 Reviewed-by: Daco Harkes <dacoharkes@google.com> Commit-Queue: Daco Harkes <dacoharkes@google.com>
269 lines
8.8 KiB
C++
269 lines
8.8 KiB
C++
// Copyright (c) 2012, the Dart project authors. Please see the AUTHORS file
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// for details. All rights reserved. Use of this source code is governed by a
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// BSD-style license that can be found in the LICENSE file.
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#include "vm/globals.h"
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#if defined(TARGET_ARCH_ARM)
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#include "vm/cpu.h"
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#include "vm/cpu_arm.h"
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#include "vm/cpuinfo.h"
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#include "vm/heap/heap.h"
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#include "vm/isolate.h"
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#include "vm/object.h"
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#include "vm/simulator.h"
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#if !defined(TARGET_HOST_MISMATCH)
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#if defined(DART_HOST_OS_MACOS) || defined(DART_HOST_OS_IOS)
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#include <libkern/OSCacheControl.h>
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#elif defined(DART_HOST_OS_WINDOWS)
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#include <processthreadsapi.h>
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#endif
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#if !defined(DART_HOST_OS_WINDOWS)
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#include <string.h> /* NOLINT */
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#include <sys/utsname.h> /* NOLINT */
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#endif
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#endif
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// ARM version differences.
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// We support only ARMv7 and variants. We detect the presence of vfp,
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// neon, and integer division instructions. Considering ARMv5TE as the baseline,
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// later versions add the following features/instructions that we use:
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//
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// ARMv6:
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// - PC read offset in store instructions is 8 rather than 12, matching the
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// offset in read instructions,
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// - strex, ldrex, and clrex load/store/clear exclusive instructions,
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// - umaal multiplication instruction,
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// ARMv7:
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// - movw, movt 16-bit immediate load instructions,
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// - mls multiplication instruction,
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// - vmovs, vmovd floating point immediate load instructions.
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//
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// If an aarch64 CPU is detected, we generate ARMv7 code.
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//
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// Where we are missing vfp, we do not unbox doubles, or generate intrinsics for
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// floating point operations. Where we are missing neon, we do not unbox SIMD
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// values, or inline operations on SIMD values. Where we are missing integer
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// division, we do not inline division operations, and we do not generate
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// intrinsics that do division. See the feature tests in flow_graph_optimizer.cc
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// for details.
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namespace dart {
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DEFINE_FLAG(bool, use_neon, true, "Use neon instructions if supported");
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DEFINE_FLAG(bool,
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use_integer_division,
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true,
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"Use integer division instruction if supported");
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#if defined(TARGET_HOST_MISMATCH)
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#if defined(DART_TARGET_OS_ANDROID) || defined(DART_TARGET_OS_MACOS_IOS)
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DEFINE_FLAG(bool, sim_use_hardfp, false, "Use the hardfp ABI.");
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#else
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DEFINE_FLAG(bool, sim_use_hardfp, true, "Use the hardfp ABI.");
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#endif
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#endif
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void CPU::FlushICache(uword start, uword size) {
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#if defined(DART_PRECOMPILED_RUNTIME)
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UNREACHABLE();
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#elif !defined(TARGET_HOST_MISMATCH) && HOST_ARCH_ARM
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// Nothing to do. Flushing no instructions.
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if (size == 0) {
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return;
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}
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// ARM recommends using the gcc intrinsic __clear_cache on Linux, and the
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// library call cacheflush from unistd.h on Android:
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//
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// https://community.arm.com/developer/ip-products/processors/b/processors-ip-blog/posts/caches-and-self-modifying-code
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//
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// On iOS we use sys_icache_invalidate from Darwin. See:
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//
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// https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man3/sys_icache_invalidate.3.html
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#if defined(DART_HOST_OS_IOS)
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sys_icache_invalidate(reinterpret_cast<void*>(start), size);
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#elif defined(DART_HOST_OS_LINUX)
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char* beg = reinterpret_cast<char*>(start);
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char* end = reinterpret_cast<char*>(start + size);
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__builtin___clear_cache(beg, end);
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#elif defined(DART_HOST_OS_ANDROID)
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cacheflush(start, start + size, 0);
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#elif defined(DART_HOST_OS_WINDOWS)
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BOOL result = FlushInstructionCache(
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GetCurrentProcess(), reinterpret_cast<const void*>(start), size);
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ASSERT(result != 0);
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#else
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#error FlushICache only tested/supported on Linux, Android and iOS
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#endif
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#endif
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}
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const char* CPU::Id() {
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return
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#if defined(TARGET_HOST_MISMATCH)
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"sim"
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#endif // defined(TARGET_HOST_MISMATCH)
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"arm";
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}
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bool HostCPUFeatures::integer_division_supported_ = false;
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bool HostCPUFeatures::neon_supported_ = false;
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bool HostCPUFeatures::hardfp_supported_ = false;
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const char* HostCPUFeatures::hardware_ = NULL;
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intptr_t HostCPUFeatures::store_pc_read_offset_ = 8;
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#if defined(DEBUG)
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bool HostCPUFeatures::initialized_ = false;
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#endif
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#if !defined(TARGET_HOST_MISMATCH)
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#if DART_HOST_OS_IOS
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void HostCPUFeatures::Init() {
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// TODO(24743): Actually check the CPU features and fail if we're missing
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// something assumed in a precompiled snapshot.
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hardware_ = "";
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// When the VM is targetted to ARMv7, pretend that the CPU is ARMv7 even if
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// the CPU is actually AArch64.
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integer_division_supported_ = FLAG_use_integer_division;
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neon_supported_ = FLAG_use_neon;
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hardfp_supported_ = false;
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#if defined(DEBUG)
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initialized_ = true;
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#endif
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}
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#elif DART_HOST_OS_WINDOWS
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void HostCPUFeatures::Init() {
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hardware_ = "";
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integer_division_supported_ = true;
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neon_supported_ = true;
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hardfp_supported_ = true;
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#if defined(DEBUG)
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initialized_ = true;
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#endif
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}
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#else // DART_HOST_OS_IOS
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void HostCPUFeatures::Init() {
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bool is_arm64 = false;
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CpuInfo::Init();
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hardware_ = CpuInfo::GetCpuModel();
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// QEMU may report host cpuinfo instead of emulated cpuinfo, use uname as a
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// fallback for checking if CPU is AArch64 or ARMv7.
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struct utsname uname_;
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int ret_ = uname(&uname_);
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// Check for ARMv7, or aarch64.
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// It can be in either the Processor or Model information fields.
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if (CpuInfo::FieldContains(kCpuInfoProcessor, "aarch64") ||
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CpuInfo::FieldContains(kCpuInfoModel, "aarch64") ||
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CpuInfo::FieldContains(kCpuInfoArchitecture, "8") ||
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CpuInfo::FieldContains(kCpuInfoArchitecture, "AArch64") ||
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(ret_ == 0 && (strstr(uname_.machine, "aarch64") != NULL ||
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strstr(uname_.machine, "arm64") != NULL ||
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strstr(uname_.machine, "armv8") != NULL))) {
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// pretend that this arm64 cpu is really an ARMv7
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is_arm64 = true;
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} else if (!CpuInfo::FieldContains(kCpuInfoProcessor, "ARMv7") &&
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!CpuInfo::FieldContains(kCpuInfoModel, "ARMv7") &&
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!CpuInfo::FieldContains(kCpuInfoArchitecture, "7") &&
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!(ret_ == 0 && strstr(uname_.machine, "armv7") != NULL)) {
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FATAL("Unrecognized ARM CPU architecture.");
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}
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// Has integer division.
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// Special cases:
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// - Qualcomm Krait CPUs (QCT APQ8064) in Nexus 4 and 7 incorrectly report
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// that they lack integer division.
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// - Marvell Armada 370/XP incorrectly reports that it has integer division.
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bool is_krait = CpuInfo::FieldContains(kCpuInfoHardware, "QCT APQ8064");
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bool is_armada_370xp =
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CpuInfo::FieldContains(kCpuInfoHardware, "Marvell Armada 370/XP");
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bool is_virtual_machine =
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CpuInfo::FieldContains(kCpuInfoHardware, "Dummy Virtual Machine");
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#if defined(DART_HOST_OS_ANDROID)
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bool is_android = true;
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#else
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bool is_android = false;
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#endif
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if (is_krait) {
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integer_division_supported_ = FLAG_use_integer_division;
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} else if (is_android && is_arm64) {
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// Various Android ARM64 devices, including the Qualcomm Snapdragon 820/821
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// CPUs (MSM 8996 and MSM8996pro) in Xiaomi MI5 and Pixel lack integer
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// division even though ARMv8 requires it in A32. Instead of attempting to
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// track all of these devices, we conservatively disable use of integer
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// division on Android ARM64 devices.
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// TODO(29270): /proc/self/auxv might be more reliable here.
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integer_division_supported_ = false;
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} else if (is_armada_370xp) {
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integer_division_supported_ = false;
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} else if (is_android && !is_arm64 && is_virtual_machine) {
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// Some Android ARM emulators claim support for integer division in
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// /proc/cpuinfo but do not actually support it.
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integer_division_supported_ = false;
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} else {
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integer_division_supported_ =
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(CpuInfo::FieldContains(kCpuInfoFeatures, "idiva") || is_arm64) &&
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FLAG_use_integer_division;
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}
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neon_supported_ =
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(CpuInfo::FieldContains(kCpuInfoFeatures, "neon") || is_arm64) &&
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FLAG_use_neon;
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// Use the cross-compiler's predefined macros to determine whether we should
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// use the hard or soft float ABI.
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#if defined(__ARM_PCS_VFP)
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hardfp_supported_ = true;
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#else
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hardfp_supported_ = false;
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#endif
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#if defined(DEBUG)
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initialized_ = true;
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#endif
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}
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#endif // DART_HOST_OS_IOS
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void HostCPUFeatures::Cleanup() {
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DEBUG_ASSERT(initialized_);
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#if defined(DEBUG)
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initialized_ = false;
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#endif
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ASSERT(hardware_ != NULL);
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free(const_cast<char*>(hardware_));
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hardware_ = NULL;
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CpuInfo::Cleanup();
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}
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#else
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void HostCPUFeatures::Init() {
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CpuInfo::Init();
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hardware_ = CpuInfo::GetCpuModel();
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integer_division_supported_ = FLAG_use_integer_division;
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neon_supported_ = FLAG_use_neon;
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hardfp_supported_ = FLAG_sim_use_hardfp;
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#if defined(DEBUG)
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initialized_ = true;
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#endif
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}
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void HostCPUFeatures::Cleanup() {
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DEBUG_ASSERT(initialized_);
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#if defined(DEBUG)
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initialized_ = false;
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#endif
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ASSERT(hardware_ != NULL);
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free(const_cast<char*>(hardware_));
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hardware_ = NULL;
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CpuInfo::Cleanup();
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}
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#endif // !defined(TARGET_HOST_MISMATCH)
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} // namespace dart
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#endif // defined TARGET_ARCH_ARM
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