// Copyright 2012 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#if V8_TARGET_ARCH_ARM
#include "src/api-arguments-inl.h"
#include "src/assembler-inl.h"
#include "src/base/bits.h"
#include "src/bootstrapper.h"
#include "src/code-stubs.h"
#include "src/counters.h"
#include "src/double.h"
#include "src/frame-constants.h"
#include "src/frames.h"
#include "src/heap/heap-inl.h"
#include "src/ic/ic.h"
#include "src/ic/stub-cache.h"
#include "src/isolate.h"
#include "src/objects/api-callbacks.h"
#include "src/objects/regexp-match-info.h"
#include "src/regexp/jsregexp.h"
#include "src/regexp/regexp-macro-assembler.h"
#include "src/runtime/runtime.h"
#include "src/arm/code-stubs-arm.h" // Cannot be the first include.
namespace v8 {
namespace internal {
#define __ ACCESS_MASM(masm)
void JSEntryStub::Generate(MacroAssembler* masm) {
// r0: code entry
// r1: function
// r2: receiver
// r3: argc
// [sp+0]: argv
Label invoke, handler_entry, exit;
{
NoRootArrayScope no_root_array(masm);
ProfileEntryHookStub::MaybeCallEntryHook(masm);
// Called from C, so do not pop argc and args on exit (preserve sp)
// No need to save register-passed args
// Save callee-saved registers (incl. cp and fp), sp, and lr
__ stm(db_w, sp, kCalleeSaved | lr.bit());
// Save callee-saved vfp registers.
__ vstm(db_w, sp, kFirstCalleeSavedDoubleReg, kLastCalleeSavedDoubleReg);
// Set up the reserved register for 0.0.
__ vmov(kDoubleRegZero, Double(0.0));
__ InitializeRootRegister();
}
// Get address of argv, see stm above.
// r0: code entry
// r1: function
// r2: receiver
// r3: argc
// Set up argv in r4.
int offset_to_argv = (kNumCalleeSaved + 1) * kPointerSize;
offset_to_argv += kNumDoubleCalleeSaved * kDoubleSize;
__ ldr(r4, MemOperand(sp, offset_to_argv));
// Push a frame with special values setup to mark it as an entry frame.
// r0: code entry
// r1: function
// r2: receiver
// r3: argc
// r4: argv
StackFrame::Type marker = type();
__ mov(r7, Operand(StackFrame::TypeToMarker(marker)));
__ mov(r6, Operand(StackFrame::TypeToMarker(marker)));
__ mov(r5, Operand(ExternalReference::Create(
IsolateAddressId::kCEntryFPAddress, isolate())));
__ ldr(r5, MemOperand(r5));
{
UseScratchRegisterScope temps(masm);
Register scratch = temps.Acquire();
// Push a bad frame pointer to fail if it is used.
__ mov(scratch, Operand(-1));
__ stm(db_w, sp, r5.bit() | r6.bit() | r7.bit() | scratch.bit());
}
Register scratch = r6;
// Set up frame pointer for the frame to be pushed.
__ add(fp, sp, Operand(-EntryFrameConstants::kCallerFPOffset));
// If this is the outermost JS call, set js_entry_sp value.
Label non_outermost_js;
ExternalReference js_entry_sp =
ExternalReference::Create(IsolateAddressId::kJSEntrySPAddress, isolate());
__ mov(r5, Operand(ExternalReference(js_entry_sp)));
__ ldr(scratch, MemOperand(r5));
__ cmp(scratch, Operand::Zero());
__ b(ne, &non_outermost_js);
__ str(fp, MemOperand(r5));
__ mov(scratch, Operand(StackFrame::OUTERMOST_JSENTRY_FRAME));
Label cont;
__ b(&cont);
__ bind(&non_outermost_js);
__ mov(scratch, Operand(StackFrame::INNER_JSENTRY_FRAME));
__ bind(&cont);
__ push(scratch);
// Jump to a faked try block that does the invoke, with a faked catch
// block that sets the pending exception.
__ jmp(&invoke);
// Block literal pool emission whilst taking the position of the handler
// entry. This avoids making the assumption that literal pools are always
// emitted after an instruction is emitted, rather than before.
{
Assembler::BlockConstPoolScope block_const_pool(masm);
__ bind(&handler_entry);
handler_offset_ = handler_entry.pos();
// Caught exception: Store result (exception) in the pending exception
// field in the JSEnv and return a failure sentinel. Coming in here the
// fp will be invalid because the PushStackHandler below sets it to 0 to
// signal the existence of the JSEntry frame.
__ mov(scratch,
Operand(ExternalReference::Create(
IsolateAddressId::kPendingExceptionAddress, isolate())));
}
__ str(r0, MemOperand(scratch));
__ LoadRoot(r0, Heap::kExceptionRootIndex);
__ b(&exit);
// Invoke: Link this frame into the handler chain.
__ bind(&invoke);
// Must preserve r0-r4, r5-r6 are available.
__ PushStackHandler();
// If an exception not caught by another handler occurs, this handler
// returns control to the code after the bl(&invoke) above, which
// restores all kCalleeSaved registers (including cp and fp) to their
// saved values before returning a failure to C.
// Invoke the function by calling through JS entry trampoline builtin.
// Notice that we cannot store a reference to the trampoline code directly in
// this stub, because runtime stubs are not traversed when doing GC.
// Expected registers by Builtins::JSEntryTrampoline
// r0: code entry
// r1: function
// r2: receiver
// r3: argc
// r4: argv
__ Call(EntryTrampoline(), RelocInfo::CODE_TARGET);
// Unlink this frame from the handler chain.
__ PopStackHandler();
__ bind(&exit); // r0 holds result
// Check if the current stack frame is marked as the outermost JS frame.
Label non_outermost_js_2;
__ pop(r5);
__ cmp(r5, Operand(StackFrame::OUTERMOST_JSENTRY_FRAME));
__ b(ne, &non_outermost_js_2);
__ mov(r6, Operand::Zero());
__ mov(r5, Operand(ExternalReference(js_entry_sp)));
__ str(r6, MemOperand(r5));
__ bind(&non_outermost_js_2);
// Restore the top frame descriptors from the stack.
__ pop(r3);
__ mov(scratch, Operand(ExternalReference::Create(
IsolateAddressId::kCEntryFPAddress, isolate())));
__ str(r3, MemOperand(scratch));
// Reset the stack to the callee saved registers.
__ add(sp, sp, Operand(-EntryFrameConstants::kCallerFPOffset));
// Restore callee-saved registers and return.
#ifdef DEBUG
if (FLAG_debug_code) {
__ mov(lr, Operand(pc));
}
#endif
// Restore callee-saved vfp registers.
__ vldm(ia_w, sp, kFirstCalleeSavedDoubleReg, kLastCalleeSavedDoubleReg);
__ ldm(ia_w, sp, kCalleeSaved | pc.bit());
}
void DirectCEntryStub::Generate(MacroAssembler* masm) {
// Place the return address on the stack, making the call
// GC safe. The RegExp backend also relies on this.
__ str(lr, MemOperand(sp, 0));
__ blx(ip); // Call the C++ function.
__ ldr(pc, MemOperand(sp, 0));
}
void DirectCEntryStub::GenerateCall(MacroAssembler* masm,
Register target) {
if (FLAG_embedded_builtins) {
if (masm->root_array_available() &&
isolate()->ShouldLoadConstantsFromRootList()) {
// This is basically an inlined version of Call(Handle<Code>) that loads
// the code object into lr instead of ip.
__ Move(ip, target);
__ IndirectLoadConstant(lr, GetCode());
__ add(lr, lr, Operand(Code::kHeaderSize - kHeapObjectTag));
__ blx(lr);
return;
}
}
intptr_t code =
reinterpret_cast<intptr_t>(GetCode().location());
__ Move(ip, target);
__ mov(lr, Operand(code, RelocInfo::CODE_TARGET));
__ blx(lr); // Call the stub.
}
void ProfileEntryHookStub::MaybeCallEntryHookDelayed(TurboAssembler* tasm,
Zone* zone) {
if (tasm->isolate()->function_entry_hook() != nullptr) {
tasm->MaybeCheckConstPool();
PredictableCodeSizeScope predictable(
tasm, TurboAssembler::kCallStubSize + 2 * kInstrSize);
tasm->push(lr);
tasm->CallStubDelayed(new (zone) ProfileEntryHookStub(nullptr));
tasm->pop(lr);
}
}
void ProfileEntryHookStub::MaybeCallEntryHook(MacroAssembler* masm) {
if (masm->isolate()->function_entry_hook() != nullptr) {
ProfileEntryHookStub stub(masm->isolate());
masm->MaybeCheckConstPool();
PredictableCodeSizeScope predictable(
masm, TurboAssembler::kCallStubSize + 2 * kInstrSize);
__ push(lr);
__ CallStub(&stub);
__ pop(lr);
}
}
void ProfileEntryHookStub::Generate(MacroAssembler* masm) {
// The entry hook is a "push lr" instruction, followed by a call.
const int32_t kReturnAddressDistanceFromFunctionStart = 3 * kInstrSize;
// This should contain all kCallerSaved registers.
const RegList kSavedRegs =
1 << 0 | // r0
1 << 1 | // r1
1 << 2 | // r2
1 << 3 | // r3
1 << 5 | // r5
1 << 9; // r9
// We also save lr, so the count here is one higher than the mask indicates.
const int32_t kNumSavedRegs = 7;
DCHECK_EQ(kCallerSaved & kSavedRegs, kCallerSaved);
// Save all caller-save registers as this may be called from anywhere.
__ stm(db_w, sp, kSavedRegs | lr.bit());
// Compute the function's address for the first argument.
__ sub(r0, lr, Operand(kReturnAddressDistanceFromFunctionStart));
// The caller's return address is above the saved temporaries.
// Grab that for the second argument to the hook.
__ add(r1, sp, Operand(kNumSavedRegs * kPointerSize));
// Align the stack if necessary.
int frame_alignment = masm->ActivationFrameAlignment();
if (frame_alignment > kPointerSize) {
__ mov(r5, sp);
DCHECK(base::bits::IsPowerOfTwo(frame_alignment));
__ and_(sp, sp, Operand(-frame_alignment));
}
{
UseScratchRegisterScope temps(masm);
Register scratch = temps.Acquire();
#if V8_HOST_ARCH_ARM
int32_t entry_hook =
reinterpret_cast<int32_t>(isolate()->function_entry_hook());
__ mov(scratch, Operand(entry_hook));
#else
// Under the simulator we need to indirect the entry hook through a
// trampoline function at a known address.
// It additionally takes an isolate as a third parameter
__ mov(r2, Operand(ExternalReference::isolate_address(isolate())));
ApiFunction dispatcher(FUNCTION_ADDR(EntryHookTrampoline));
__ mov(scratch, Operand(ExternalReference::Create(
&dispatcher, ExternalReference::BUILTIN_CALL)));
#endif
__ Call(scratch);
}
// Restore the stack pointer if needed.
if (frame_alignment > kPointerSize) {
__ mov(sp, r5);
}
// Also pop pc to get Ret(0).
__ ldm(ia_w, sp, kSavedRegs | pc.bit());
}
static int AddressOffset(ExternalReference ref0, ExternalReference ref1) {
return ref0.address() - ref1.address();
}
// Calls an API function. Allocates HandleScope, extracts returned value
// from handle and propagates exceptions. Restores context. stack_space
// - space to be unwound on exit (includes the call JS arguments space and
// the additional space allocated for the fast call).
static void CallApiFunctionAndReturn(MacroAssembler* masm,
Register function_address,
ExternalReference thunk_ref,
int stack_space,
MemOperand* stack_space_operand,
MemOperand return_value_operand) {
Isolate* isolate = masm->isolate();
ExternalReference next_address =
ExternalReference::handle_scope_next_address(isolate);
const int kNextOffset = 0;
const int kLimitOffset = AddressOffset(
ExternalReference::handle_scope_limit_address(isolate), next_address);
const int kLevelOffset = AddressOffset(
ExternalReference::handle_scope_level_address(isolate), next_address);
DCHECK(function_address == r1 || function_address == r2);
Label profiler_disabled;
Label end_profiler_check;
__ Move(r9, ExternalReference::is_profiling_address(isolate));
__ ldrb(r9, MemOperand(r9, 0));
__ cmp(r9, Operand(0));
__ b(eq, &profiler_disabled);
// Additional parameter is the address of the actual callback.
__ Move(r3, thunk_ref);
__ jmp(&end_profiler_check);
__ bind(&profiler_disabled);
__ Move(r3, function_address);
__ bind(&end_profiler_check);
// Allocate HandleScope in callee-save registers.
__ Move(r9, next_address);
__ ldr(r4, MemOperand(r9, kNextOffset));
__ ldr(r5, MemOperand(r9, kLimitOffset));
__ ldr(r6, MemOperand(r9, kLevelOffset));
__ add(r6, r6, Operand(1));
__ str(r6, MemOperand(r9, kLevelOffset));
if (FLAG_log_timer_events) {
FrameScope frame(masm, StackFrame::MANUAL);
__ PushSafepointRegisters();
__ PrepareCallCFunction(1);
__ Move(r0, ExternalReference::isolate_address(isolate));
__ CallCFunction(ExternalReference::log_enter_external_function(), 1);
__ PopSafepointRegisters();
}
// Native call returns to the DirectCEntry stub which redirects to the
// return address pushed on stack (could have moved after GC).
// DirectCEntry stub itself is generated early and never moves.
DirectCEntryStub stub(isolate);
stub.GenerateCall(masm, r3);
if (FLAG_log_timer_events) {
FrameScope frame(masm, StackFrame::MANUAL);
__ PushSafepointRegisters();
__ PrepareCallCFunction(1);
__ Move(r0, ExternalReference::isolate_address(isolate));
__ CallCFunction(ExternalReference::log_leave_external_function(), 1);
__ PopSafepointRegisters();
}
Label promote_scheduled_exception;
Label delete_allocated_handles;
Label leave_exit_frame;
Label return_value_loaded;
// load value from ReturnValue
__ ldr(r0, return_value_operand);
__ bind(&return_value_loaded);
// No more valid handles (the result handle was the last one). Restore
// previous handle scope.
__ str(r4, MemOperand(r9, kNextOffset));
if (__ emit_debug_code()) {
__ ldr(r1, MemOperand(r9, kLevelOffset));
__ cmp(r1, r6);
__ Check(eq, AbortReason::kUnexpectedLevelAfterReturnFromApiCall);
}
__ sub(r6, r6, Operand(1));
__ str(r6, MemOperand(r9, kLevelOffset));
__ ldr(r6, MemOperand(r9, kLimitOffset));
__ cmp(r5, r6);
__ b(ne, &delete_allocated_handles);
// Leave the API exit frame.
__ bind(&leave_exit_frame);
// LeaveExitFrame expects unwind space to be in a register.
if (stack_space_operand != nullptr) {
__ ldr(r4, *stack_space_operand);
} else {
__ mov(r4, Operand(stack_space));
}
__ LeaveExitFrame(false, r4, stack_space_operand != nullptr);
// Check if the function scheduled an exception.
__ LoadRoot(r4, Heap::kTheHoleValueRootIndex);
__ Move(r6, ExternalReference::scheduled_exception_address(isolate));
__ ldr(r5, MemOperand(r6));
__ cmp(r4, r5);
__ b(ne, &promote_scheduled_exception);
__ mov(pc, lr);
// Re-throw by promoting a scheduled exception.
__ bind(&promote_scheduled_exception);
__ TailCallRuntime(Runtime::kPromoteScheduledException);
// HandleScope limit has changed. Delete allocated extensions.
__ bind(&delete_allocated_handles);
__ str(r5, MemOperand(r9, kLimitOffset));
__ mov(r4, r0);
__ PrepareCallCFunction(1);
__ Move(r0, ExternalReference::isolate_address(isolate));
__ CallCFunction(ExternalReference::delete_handle_scope_extensions(), 1);
__ mov(r0, r4);
__ jmp(&leave_exit_frame);
}
void CallApiCallbackStub::Generate(MacroAssembler* masm) {
// ----------- S t a t e -------------
// -- r4 : call_data
// -- r2 : holder
// -- r1 : api_function_address
// -- cp : context
// --
// -- sp[0] : last argument
// -- ...
// -- sp[(argc - 1) * 4] : first argument
// -- sp[argc * 4] : receiver
// -----------------------------------
Register call_data = r4;
Register holder = r2;
Register api_function_address = r1;
typedef FunctionCallbackArguments FCA;
STATIC_ASSERT(FCA::kArgsLength == 6);
STATIC_ASSERT(FCA::kNewTargetIndex == 5);
STATIC_ASSERT(FCA::kDataIndex == 4);
STATIC_ASSERT(FCA::kReturnValueOffset == 3);
STATIC_ASSERT(FCA::kReturnValueDefaultValueIndex == 2);
STATIC_ASSERT(FCA::kIsolateIndex == 1);
STATIC_ASSERT(FCA::kHolderIndex == 0);
// new target
__ PushRoot(Heap::kUndefinedValueRootIndex);
// call data
__ push(call_data);
Register scratch0 = call_data;
Register scratch1 = r5;
__ LoadRoot(scratch0, Heap::kUndefinedValueRootIndex);
// return value
__ push(scratch0);
// return value default
__ push(scratch0);
// isolate
__ Move(scratch1, ExternalReference::isolate_address(masm->isolate()));
__ push(scratch1);
// holder
__ push(holder);
// Prepare arguments.
__ mov(scratch0, sp);
// Allocate the v8::Arguments structure in the arguments' space since
// it's not controlled by GC.
const int kApiStackSpace = 3;
FrameScope frame_scope(masm, StackFrame::MANUAL);
__ EnterExitFrame(false, kApiStackSpace);
DCHECK(api_function_address != r0 && scratch0 != r0);
// r0 = FunctionCallbackInfo&
// Arguments is after the return address.
__ add(r0, sp, Operand(1 * kPointerSize));
// FunctionCallbackInfo::implicit_args_
__ str(scratch0, MemOperand(r0, 0 * kPointerSize));
// FunctionCallbackInfo::values_
__ add(scratch1, scratch0,
Operand((FCA::kArgsLength - 1 + argc()) * kPointerSize));
__ str(scratch1, MemOperand(r0, 1 * kPointerSize));
// FunctionCallbackInfo::length_ = argc
__ mov(scratch0, Operand(argc()));
__ str(scratch0, MemOperand(r0, 2 * kPointerSize));
ExternalReference thunk_ref = ExternalReference::invoke_function_callback();
AllowExternalCallThatCantCauseGC scope(masm);
// Stores return the first js argument
int return_value_offset = 2 + FCA::kReturnValueOffset;
MemOperand return_value_operand(fp, return_value_offset * kPointerSize);
const int stack_space = argc() + FCA::kArgsLength + 1;
MemOperand* stack_space_operand = nullptr;
CallApiFunctionAndReturn(masm, api_function_address, thunk_ref, stack_space,
stack_space_operand, return_value_operand);
}
void CallApiGetterStub::Generate(MacroAssembler* masm) {
// Build v8::PropertyCallbackInfo::args_ array on the stack and push property
// name below the exit frame to make GC aware of them.
STATIC_ASSERT(PropertyCallbackArguments::kShouldThrowOnErrorIndex == 0);
STATIC_ASSERT(PropertyCallbackArguments::kHolderIndex == 1);
STATIC_ASSERT(PropertyCallbackArguments::kIsolateIndex == 2);
STATIC_ASSERT(PropertyCallbackArguments::kReturnValueDefaultValueIndex == 3);
STATIC_ASSERT(PropertyCallbackArguments::kReturnValueOffset == 4);
STATIC_ASSERT(PropertyCallbackArguments::kDataIndex == 5);
STATIC_ASSERT(PropertyCallbackArguments::kThisIndex == 6);
STATIC_ASSERT(PropertyCallbackArguments::kArgsLength == 7);
Register receiver = ApiGetterDescriptor::ReceiverRegister();
Register holder = ApiGetterDescriptor::HolderRegister();
Register callback = ApiGetterDescriptor::CallbackRegister();
Register scratch = r4;
DCHECK(!AreAliased(receiver, holder, callback, scratch));
Register api_function_address = r2;
__ push(receiver);
// Push data from AccessorInfo.
__ ldr(scratch, FieldMemOperand(callback, AccessorInfo::kDataOffset));
__ push(scratch);
__ LoadRoot(scratch, Heap::kUndefinedValueRootIndex);
__ Push(scratch, scratch);
__ Move(scratch, ExternalReference::isolate_address(isolate()));
__ Push(scratch, holder);
__ Push(Smi::kZero); // should_throw_on_error -> false
__ ldr(scratch, FieldMemOperand(callback, AccessorInfo::kNameOffset));
__ push(scratch);
// v8::PropertyCallbackInfo::args_ array and name handle.
const int kStackUnwindSpace = PropertyCallbackArguments::kArgsLength + 1;
// Load address of v8::PropertyAccessorInfo::args_ array and name handle.
__ mov(r0, sp); // r0 = Handle<Name>
__ add(r1, r0, Operand(1 * kPointerSize)); // r1 = v8::PCI::args_
const int kApiStackSpace = 1;
FrameScope frame_scope(masm, StackFrame::MANUAL);
__ EnterExitFrame(false, kApiStackSpace);
// Create v8::PropertyCallbackInfo object on the stack and initialize
// it's args_ field.
__ str(r1, MemOperand(sp, 1 * kPointerSize));
__ add(r1, sp, Operand(1 * kPointerSize)); // r1 = v8::PropertyCallbackInfo&
ExternalReference thunk_ref =
ExternalReference::invoke_accessor_getter_callback();
__ ldr(scratch, FieldMemOperand(callback, AccessorInfo::kJsGetterOffset));
__ ldr(api_function_address,
FieldMemOperand(scratch, Foreign::kForeignAddressOffset));
// +3 is to skip prolog, return address and name handle.
MemOperand return_value_operand(
fp, (PropertyCallbackArguments::kReturnValueOffset + 3) * kPointerSize);
CallApiFunctionAndReturn(masm, api_function_address, thunk_ref,
kStackUnwindSpace, nullptr, return_value_operand);
}
#undef __
} // namespace internal
} // namespace v8
#endif // V8_TARGET_ARCH_ARM