zra@google.com
7c91e88e6e
When we detect ARMv6, instead of using movw and movt, this change loads each individual byte. Although this is not the best way to achieve this, a modification to store large constants in the object pool would be more invasive. Further, this change will be easier to back-out once ARMv6 is obsolete. R=regis@google.com Review URL: https://codereview.chromium.org//183803024 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@33442 260f80e4-7a28-3924-810f-c04153c831b5
135 lines
3.4 KiB
C++
135 lines
3.4 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/cpuinfo.h"
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#include "vm/simulator.h"
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#if defined(HOST_ARCH_ARM)
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#include <sys/syscall.h> /* NOLINT */
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#include <unistd.h> /* NOLINT */
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#endif
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namespace dart {
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void CPU::FlushICache(uword start, uword size) {
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#if defined(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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// blogs.arm.com/software-enablement/141-caches-and-self-modifying-code/
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#if defined(__linux__) && !defined(ANDROID)
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extern void __clear_cache(char*, char*);
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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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::__clear_cache(beg, end);
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#elif defined(ANDROID)
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cacheflush(start, start + size, 0);
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#else
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#error FlushICache only tested/supported on Linux and Android
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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(HOST_ARCH_ARM)
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"sim"
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#endif // !defined(HOST_ARCH_ARM)
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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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const char* HostCPUFeatures::hardware_ = NULL;
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ARMVersion HostCPUFeatures::arm_version_ = ARMvUnknown;
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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(HOST_ARCH_ARM)
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void HostCPUFeatures::InitOnce() {
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CpuInfo::InitOnce();
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hardware_ = CpuInfo::GetCpuModel();
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// Check for ARMv6 or ARMv7. It can be in either the Processor or
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// Model information fields.
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if (CpuInfo::FieldContains(kCpuInfoProcessor, "ARMv6") ||
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CpuInfo::FieldContains(kCpuInfoModel, "ARMv6")) {
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arm_version_ = ARMv6;
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} else {
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ASSERT(CpuInfo::FieldContains(kCpuInfoProcessor, "ARMv7") ||
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CpuInfo::FieldContains(kCpuInfoModel, "ARMv7"));
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arm_version_ = ARMv7;
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}
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// Has floating point unit.
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ASSERT(CpuInfo::FieldContains(kCpuInfoFeatures, "vfp"));
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// Has integer division.
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bool is_krait = CpuInfo::FieldContains(kCpuInfoHardware, "QCT APQ8064");
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if (is_krait) {
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// Special case for Qualcomm Krait CPUs in Nexus 4 and 7.
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integer_division_supported_ = true;
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} else {
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integer_division_supported_ =
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CpuInfo::FieldContains(kCpuInfoFeatures, "idiva");
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}
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neon_supported_ = CpuInfo::FieldContains(kCpuInfoFeatures, "neon");
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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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#else
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void HostCPUFeatures::InitOnce() {
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CpuInfo::InitOnce();
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hardware_ = CpuInfo::GetCpuModel();
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integer_division_supported_ = true;
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neon_supported_ = true;
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arm_version_ = ARMv7;
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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(HOST_ARCH_ARM)
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} // namespace dart
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#endif // defined TARGET_ARCH_ARM
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