Slava Egorov
832a205895
Flutter does not support Android versions below Android 7 (API level
24).
Simplify the code by removing workaround introduced in
a013de84e0 to work-around crashes
which only happen on Android 6.0.0.
TEST=ci
Cq-Include-Trybots: luci.dart.try:vm-aot-android-release-arm_x64-try,vm-aot-android-release-arm64c-try
Change-Id: Ib29535e66e87b17bc9b2ac72bcbb46e06a6a6964
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/472861
Reviewed-by: Martin Kustermann <kustermann@google.com>
Commit-Queue: Slava Egorov <vegorov@google.com>
142 lines
4.6 KiB
C++
142 lines
4.6 KiB
C++
// Copyright (c) 2013, 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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#include "vm/instructions.h"
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#include "vm/signal_handler.h"
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#include "vm/simulator.h"
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#if defined(DART_HOST_OS_ANDROID)
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namespace dart {
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uintptr_t SignalHandler::GetProgramCounter(const mcontext_t& mcontext) {
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uintptr_t pc = 0;
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#if defined(HOST_ARCH_IA32)
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pc = static_cast<uintptr_t>(mcontext.gregs[REG_EIP]);
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#elif defined(HOST_ARCH_X64)
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pc = static_cast<uintptr_t>(mcontext.gregs[REG_RIP]);
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#elif defined(HOST_ARCH_ARM)
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pc = static_cast<uintptr_t>(mcontext.arm_pc);
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#elif defined(HOST_ARCH_ARM64)
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pc = static_cast<uintptr_t>(mcontext.pc);
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#elif defined(HOST_ARCH_RISCV64)
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pc = static_cast<uintptr_t>(mcontext.__gregs[REG_PC]);
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#else
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#error Unsupported architecture.
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#endif // HOST_ARCH_...
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return pc;
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}
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uintptr_t SignalHandler::GetFramePointer(const mcontext_t& mcontext) {
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uintptr_t fp = 0;
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#if defined(HOST_ARCH_IA32)
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fp = static_cast<uintptr_t>(mcontext.gregs[REG_EBP]);
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#elif defined(HOST_ARCH_X64)
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fp = static_cast<uintptr_t>(mcontext.gregs[REG_RBP]);
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#elif defined(HOST_ARCH_ARM)
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// B1.3.3 Program Status Registers (PSRs)
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if ((mcontext.arm_cpsr & (1 << 5)) != 0) {
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// Thumb mode.
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fp = static_cast<uintptr_t>(mcontext.arm_r7);
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} else {
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// ARM mode.
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fp = static_cast<uintptr_t>(mcontext.arm_fp);
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}
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#elif defined(HOST_ARCH_ARM64)
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fp = static_cast<uintptr_t>(mcontext.regs[29]);
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#elif defined(HOST_ARCH_RISCV64)
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fp = static_cast<uintptr_t>(mcontext.__gregs[REG_S0]);
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#else
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#error Unsupported architecture.
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#endif // HOST_ARCH_...
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return fp;
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}
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uintptr_t SignalHandler::GetCStackPointer(const mcontext_t& mcontext) {
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uintptr_t sp = 0;
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#if defined(HOST_ARCH_IA32)
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sp = static_cast<uintptr_t>(mcontext.gregs[REG_ESP]);
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#elif defined(HOST_ARCH_X64)
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sp = static_cast<uintptr_t>(mcontext.gregs[REG_RSP]);
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#elif defined(HOST_ARCH_ARM)
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sp = static_cast<uintptr_t>(mcontext.arm_sp);
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#elif defined(HOST_ARCH_ARM64)
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sp = static_cast<uintptr_t>(mcontext.sp);
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#elif defined(HOST_ARCH_RISCV64)
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sp = static_cast<uintptr_t>(mcontext.__gregs[REG_SP]);
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#else
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#error Unsupported architecture.
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#endif // HOST_ARCH_...
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return sp;
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}
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uintptr_t SignalHandler::GetDartStackPointer(const mcontext_t& mcontext) {
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#if defined(TARGET_ARCH_ARM64) && !defined(DART_INCLUDE_SIMULATOR)
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return static_cast<uintptr_t>(mcontext.regs[SPREG]);
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#else
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return GetCStackPointer(mcontext);
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#endif
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}
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uintptr_t SignalHandler::GetLinkRegister(const mcontext_t& mcontext) {
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uintptr_t lr = 0;
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#if defined(HOST_ARCH_IA32)
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lr = 0;
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#elif defined(HOST_ARCH_X64)
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lr = 0;
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#elif defined(HOST_ARCH_ARM)
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lr = static_cast<uintptr_t>(mcontext.arm_lr);
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#elif defined(HOST_ARCH_ARM64)
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lr = static_cast<uintptr_t>(mcontext.regs[30]);
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#elif defined(HOST_ARCH_RISCV64)
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lr = static_cast<uintptr_t>(mcontext.__gregs[REG_RA]);
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#else
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#error Unsupported architecture.
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#endif // HOST_ARCH_...
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return lr;
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}
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void SignalHandler::Install(SignalAction action) {
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// Bionic implementation of setjmp temporary mangles SP register
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// in place which breaks signal delivery on the thread stack - when
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// kernel tries to deliver SIGPROF and we are in the middle of
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// setjmp SP value is invalid - might be pointing to random memory
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// or outside of writable space at all. In the first case we
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// get memory corruption and in the second case kernel would send
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// SIGSEGV to the process. See b/152210274 for details.
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// To work around this issue we request SIGPROF signals to be delivered
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// on the alternative signal stack by setting SA_ONSTACK. The stack itself
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// is configured when interrupts are enabled for a particular thread.
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// In reality Bionic's |pthread_create| eagerly creates and assigns an
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// alternative signal stack for each thread. However older versions of Bionic
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// (L and below) make the size of alternative stack too small which causes
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// stack overflows and crashes.
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struct sigaction act = {};
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act.sa_sigaction = action;
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sigemptyset(&act.sa_mask);
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sigaddset(&act.sa_mask, SIGPROF); // Prevent nested signals.
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act.sa_flags = SA_RESTART | SA_SIGINFO | SA_ONSTACK;
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int r = sigaction(SIGPROF, &act, nullptr);
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ASSERT(r == 0);
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}
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void SignalHandler::Remove() {
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// Ignore future SIGPROF signals because by default SIGPROF will terminate
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// the process and we may have some signals in flight.
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struct sigaction act = {};
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act.sa_handler = SIG_IGN;
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sigemptyset(&act.sa_mask);
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int r = sigaction(SIGPROF, &act, nullptr);
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RELEASE_ASSERT(r == 0);
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}
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} // namespace dart
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#endif // defined(DART_HOST_OS_ANDROID)
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