Martin Kustermann
3c662736d9
Now that we have a moving GC it's no longer sufficient to rely on callee-saving behavior of PP. This change also ensures that all calls go through RuntimeEntry::Call() . Issue https://github.com/dart-lang/sdk/issues/33274 Change-Id: I159986dc18a9b201175fd4a7064a24a1533790ef Reviewed-on: https://dart-review.googlesource.com/c/88711 Reviewed-by: Vyacheslav Egorov <vegorov@google.com> Commit-Queue: Martin Kustermann <kustermann@google.com>
85 lines
3.2 KiB
C++
85 lines
3.2 KiB
C++
// Copyright (c) 2014, 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_ARM64)
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#include "vm/runtime_entry.h"
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#include "vm/compiler/assembler/assembler.h"
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#include "vm/simulator.h"
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#include "vm/stub_code.h"
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namespace dart {
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#define __ assembler->
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uword RuntimeEntry::GetEntryPoint() const {
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// Compute the effective address. When running under the simulator,
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// this is a redirection address that forces the simulator to call
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// into the runtime system.
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uword entry = reinterpret_cast<uword>(function());
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#if defined(USING_SIMULATOR)
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// Redirection to leaf runtime calls supports a maximum of 4 arguments passed
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// in registers (maximum 2 double arguments for leaf float runtime calls).
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ASSERT(argument_count() >= 0);
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ASSERT(!is_leaf() || (!is_float() && (argument_count() <= 4)) ||
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(argument_count() <= 2));
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Simulator::CallKind call_kind =
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is_leaf() ? (is_float() ? Simulator::kLeafFloatRuntimeCall
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: Simulator::kLeafRuntimeCall)
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: Simulator::kRuntimeCall;
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entry =
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Simulator::RedirectExternalReference(entry, call_kind, argument_count());
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#endif
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return entry;
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}
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#if !defined(DART_PRECOMPILED_RUNTIME)
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// Generate code to call into the stub which will call the runtime
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// function. Input for the stub is as follows:
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// SP : points to the arguments and return value array.
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// R5 : address of the runtime function to call.
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// R4 : number of arguments to the call.
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void RuntimeEntry::Call(Assembler* assembler, intptr_t argument_count) const {
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if (is_leaf()) {
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ASSERT(argument_count == this->argument_count());
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// Since we are entering C++ code, we must restore the C stack pointer from
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// the stack limit to an aligned value nearer to the top of the stack.
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// We cache the Dart stack pointer and the stack limit in callee-saved
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// registers, then align and call, restoring CSP and SP on return from the
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// call.
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// This sequence may occur in an intrinsic, so don't use registers an
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// intrinsic must preserve.
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COMPILE_ASSERT(R23 != CODE_REG);
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COMPILE_ASSERT(R25 != CODE_REG);
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COMPILE_ASSERT(R23 != ARGS_DESC_REG);
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COMPILE_ASSERT(R25 != ARGS_DESC_REG);
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__ mov(R23, CSP);
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__ mov(R25, SP);
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__ ReserveAlignedFrameSpace(0);
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__ mov(CSP, SP);
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__ ldr(TMP, Address(THR, Thread::OffsetFromThread(this)));
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__ str(TMP, Address(THR, Thread::vm_tag_offset()));
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__ blr(TMP);
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__ LoadImmediate(TMP, VMTag::kDartCompiledTagId);
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__ str(TMP, Address(THR, Thread::vm_tag_offset()));
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__ mov(SP, R25);
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__ mov(CSP, R23);
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ASSERT((kAbiPreservedCpuRegs & (1 << THR)) != 0);
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ASSERT((kAbiPreservedCpuRegs & (1 << PP)) != 0);
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} else {
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// Argument count is not checked here, but in the runtime entry for a more
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// informative error message.
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__ ldr(R5, Address(THR, Thread::OffsetFromThread(this)));
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__ LoadImmediate(R4, argument_count);
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__ BranchLinkToRuntime();
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}
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}
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#endif // !defined(DART_PRECOMPILED_RUNTIME)
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} // namespace dart
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#endif // defined TARGET_ARCH_ARM64
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