Merge (7265, 7271] from bleeding_edge to experimental/gc branch....

src/arm/macro-assembler-arm.cc

 // Copyright 2011 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 25 matching lines @@
 #include "debug.h"
 #include "runtime.h"
 
 namespace v8 {
 namespace internal {
 
 MacroAssembler::MacroAssembler(void* buffer, int size)
     : Assembler(buffer, size),
       generating_stub_(false),
       allow_stub_calls_(true),
-      code_object_(Heap::undefined_value()) {
+      code_object_(HEAP->undefined_value()) {
 }
 
 
 // We always generate arm code, never thumb code, even if V8 is compiled to
 // thumb, so we require inter-working support
 #if defined(__thumb__) && !defined(USE_THUMB_INTERWORK)
 #error "flag -mthumb-interwork missing"
 #endif
 
 
@@ skipping 228 matching lines @@
 
 void MacroAssembler::And(Register dst, Register src1, const Operand& src2,
                          Condition cond) {
   if (!src2.is_reg() &&
       !src2.must_use_constant_pool() &&
       src2.immediate() == 0) {
     mov(dst, Operand(0, RelocInfo::NONE), LeaveCC, cond);
 
   } else if (!src2.is_single_instruction() &&
              !src2.must_use_constant_pool() &&
-             CpuFeatures::IsSupported(ARMv7) &&
+             Isolate::Current()->cpu_features()->IsSupported(ARMv7) &&
              IsPowerOf2(src2.immediate() + 1)) {
     ubfx(dst, src1, 0, WhichPowerOf2(src2.immediate() + 1), cond);
 
   } else {
     and_(dst, src1, src2, LeaveCC, cond);
   }
 }
 
 
 void MacroAssembler::Ubfx(Register dst, Register src1, int lsb, int width,
                           Condition cond) {
   ASSERT(lsb < 32);
-  if (!CpuFeatures::IsSupported(ARMv7)) {
+  if (!Isolate::Current()->cpu_features()->IsSupported(ARMv7)) {
     int mask = (1 << (width + lsb)) - 1 - ((1 << lsb) - 1);
     and_(dst, src1, Operand(mask), LeaveCC, cond);
     if (lsb != 0) {
       mov(dst, Operand(dst, LSR, lsb), LeaveCC, cond);
     }
   } else {
     ubfx(dst, src1, lsb, width, cond);
   }
 }
 
 
 void MacroAssembler::Sbfx(Register dst, Register src1, int lsb, int width,
                           Condition cond) {
   ASSERT(lsb < 32);
-  if (!CpuFeatures::IsSupported(ARMv7)) {
+  if (!Isolate::Current()->cpu_features()->IsSupported(ARMv7)) {
     int mask = (1 << (width + lsb)) - 1 - ((1 << lsb) - 1);
     and_(dst, src1, Operand(mask), LeaveCC, cond);
     int shift_up = 32 - lsb - width;
     int shift_down = lsb + shift_up;
     if (shift_up != 0) {
       mov(dst, Operand(dst, LSL, shift_up), LeaveCC, cond);
     }
     if (shift_down != 0) {
       mov(dst, Operand(dst, ASR, shift_down), LeaveCC, cond);
     }
   } else {
     sbfx(dst, src1, lsb, width, cond);
   }
 }
 
 
 void MacroAssembler::Bfi(Register dst,
                          Register src,
                          Register scratch,
                          int lsb,
                          int width,
                          Condition cond) {
   ASSERT(0 <= lsb && lsb < 32);
   ASSERT(0 <= width && width < 32);
   ASSERT(lsb + width < 32);
   ASSERT(!scratch.is(dst));
   if (width == 0) return;
-  if (!CpuFeatures::IsSupported(ARMv7)) {
+  if (!Isolate::Current()->cpu_features()->IsSupported(ARMv7)) {
     int mask = (1 << (width + lsb)) - 1 - ((1 << lsb) - 1);
     bic(dst, dst, Operand(mask));
     and_(scratch, src, Operand((1 << width) - 1));
     mov(scratch, Operand(scratch, LSL, lsb));
     orr(dst, dst, scratch);
   } else {
     bfi(dst, src, lsb, width, cond);
   }
 }
 
 
 void MacroAssembler::Bfc(Register dst, int lsb, int width, Condition cond) {
   ASSERT(lsb < 32);
-  if (!CpuFeatures::IsSupported(ARMv7)) {
+  if (!Isolate::Current()->cpu_features()->IsSupported(ARMv7)) {
     int mask = (1 << (width + lsb)) - 1 - ((1 << lsb) - 1);
     bic(dst, dst, Operand(mask));
   } else {
     bfc(dst, lsb, width, cond);
   }
 }
 
 
 void MacroAssembler::Usat(Register dst, int satpos, const Operand& src,
                           Condition cond) {
-  if (!CpuFeatures::IsSupported(ARMv7)) {
+  if (!Isolate::Current()->cpu_features()->IsSupported(ARMv7)) {
     ASSERT(!dst.is(pc) && !src.rm().is(pc));
     ASSERT((satpos >= 0) && (satpos <= 31));
 
     // These asserts are required to ensure compatibility with the ARMv7
     // implementation.
     ASSERT((src.shift_op() == ASR) || (src.shift_op() == LSL));
     ASSERT(src.rs().is(no_reg));
 
     Label done;
     int satval = (1 << satpos) - 1;
@@ skipping 226 matching lines @@
 
 
 void MacroAssembler::Ldrd(Register dst1, Register dst2,
                           const MemOperand& src, Condition cond) {
   ASSERT(src.rm().is(no_reg));
   ASSERT(!dst1.is(lr));  // r14.
   ASSERT_EQ(0, dst1.code() % 2);
   ASSERT_EQ(dst1.code() + 1, dst2.code());
 
   // Generate two ldr instructions if ldrd is not available.
-  if (CpuFeatures::IsSupported(ARMv7)) {
+  if (Isolate::Current()->cpu_features()->IsSupported(ARMv7)) {
     CpuFeatures::Scope scope(ARMv7);
     ldrd(dst1, dst2, src, cond);
   } else {
     MemOperand src2(src);
     src2.set_offset(src2.offset() + 4);
     if (dst1.is(src.rn())) {
       ldr(dst2, src2, cond);
       ldr(dst1, src, cond);
     } else {
       ldr(dst1, src, cond);
       ldr(dst2, src2, cond);
     }
   }
 }
 
 
 void MacroAssembler::Strd(Register src1, Register src2,
                           const MemOperand& dst, Condition cond) {
   ASSERT(dst.rm().is(no_reg));
   ASSERT(!src1.is(lr));  // r14.
   ASSERT_EQ(0, src1.code() % 2);
   ASSERT_EQ(src1.code() + 1, src2.code());
 
   // Generate two str instructions if strd is not available.
-  if (CpuFeatures::IsSupported(ARMv7)) {
+  if (Isolate::Current()->cpu_features()->IsSupported(ARMv7)) {
     CpuFeatures::Scope scope(ARMv7);
     strd(src1, src2, dst, cond);
   } else {
     MemOperand dst2(dst);
     dst2.set_offset(dst2.offset() + 4);
     str(src1, dst, cond);
     str(src2, dst2, cond);
   }
 }
 
@@ skipping 74 matching lines @@
   // Reserve room for saved entry sp and code object.
   sub(sp, sp, Operand(2 * kPointerSize));
   if (emit_debug_code()) {
     mov(ip, Operand(0));
     str(ip, MemOperand(fp, ExitFrameConstants::kSPOffset));
   }
   mov(ip, Operand(CodeObject()));
   str(ip, MemOperand(fp, ExitFrameConstants::kCodeOffset));
 
   // Save the frame pointer and the context in top.
-  mov(ip, Operand(ExternalReference(Top::k_c_entry_fp_address)));
+  mov(ip, Operand(ExternalReference(Isolate::k_c_entry_fp_address)));
   str(fp, MemOperand(ip));
-  mov(ip, Operand(ExternalReference(Top::k_context_address)));
+  mov(ip, Operand(ExternalReference(Isolate::k_context_address)));
   str(cp, MemOperand(ip));
 
   // Optionally save all double registers.
   if (save_doubles) {
     sub(sp, sp, Operand(DwVfpRegister::kNumRegisters * kDoubleSize));
     const int offset = -2 * kPointerSize;
     for (int i = 0; i < DwVfpRegister::kNumRegisters; i++) {
       DwVfpRegister reg = DwVfpRegister::from_code(i);
       vstr(reg, fp, offset - ((i + 1) * kDoubleSize));
     }
@@ skipping 55 matching lines @@
   if (save_doubles) {
     for (int i = 0; i < DwVfpRegister::kNumRegisters; i++) {
       DwVfpRegister reg = DwVfpRegister::from_code(i);
       const int offset = -2 * kPointerSize;
       vldr(reg, fp, offset - ((i + 1) * kDoubleSize));
     }
   }
 
   // Clear top frame.
   mov(r3, Operand(0, RelocInfo::NONE));
-  mov(ip, Operand(ExternalReference(Top::k_c_entry_fp_address)));
+  mov(ip, Operand(ExternalReference(Isolate::k_c_entry_fp_address)));
   str(r3, MemOperand(ip));
 
   // Restore current context from top and clear it in debug mode.
-  mov(ip, Operand(ExternalReference(Top::k_context_address)));
+  mov(ip, Operand(ExternalReference(Isolate::k_context_address)));
   ldr(cp, MemOperand(ip));
 #ifdef DEBUG
   str(r3, MemOperand(ip));
 #endif
 
   // Tear down the exit frame, pop the arguments, and return.
   mov(sp, Operand(fp));
   ldm(ia_w, sp, fp.bit() | lr.bit());
   if (argument_count.is_valid()) {
     add(sp, sp, Operand(argument_count, LSL, kPointerSizeLog2));
@@ skipping 61 matching lines @@
     }
   }
 
   if (!definitely_matches) {
     if (!code_constant.is_null()) {
       mov(r3, Operand(code_constant));
       add(r3, r3, Operand(Code::kHeaderSize - kHeapObjectTag));
     }
 
     Handle<Code> adaptor =
-        Handle<Code>(Builtins::builtin(Builtins::ArgumentsAdaptorTrampoline));
+        Handle<Code>(Isolate::Current()->builtins()->builtin(
+            Builtins::ArgumentsAdaptorTrampoline));
     if (flag == CALL_FUNCTION) {
       if (call_wrapper != NULL) {
         call_wrapper->BeforeCall(CallSize(adaptor, RelocInfo::CODE_TARGET));
       }
       Call(adaptor, RelocInfo::CODE_TARGET);
       if (call_wrapper != NULL) call_wrapper->AfterCall();
       b(done);
     } else {
       Jump(adaptor, RelocInfo::CODE_TARGET);
     }
@@ skipping 146 matching lines @@
     if (type == TRY_CATCH_HANDLER) {
       mov(r3, Operand(StackHandler::TRY_CATCH));
     } else {
       mov(r3, Operand(StackHandler::TRY_FINALLY));
     }
     ASSERT(StackHandlerConstants::kStateOffset == 1 * kPointerSize
            && StackHandlerConstants::kFPOffset == 2 * kPointerSize
            && StackHandlerConstants::kPCOffset == 3 * kPointerSize);
     stm(db_w, sp, r3.bit() | fp.bit() | lr.bit());
     // Save the current handler as the next handler.
-    mov(r3, Operand(ExternalReference(Top::k_handler_address)));
+    mov(r3, Operand(ExternalReference(Isolate::k_handler_address)));
     ldr(r1, MemOperand(r3));
     ASSERT(StackHandlerConstants::kNextOffset == 0);
     push(r1);
     // Link this handler as the new current one.
     str(sp, MemOperand(r3));
   } else {
     // Must preserve r0-r4, r5-r7 are available.
     ASSERT(try_location == IN_JS_ENTRY);
     // The frame pointer does not point to a JS frame so we save NULL
     // for fp. We expect the code throwing an exception to check fp
     // before dereferencing it to restore the context.
     mov(ip, Operand(0, RelocInfo::NONE));  // To save a NULL frame pointer.
     mov(r6, Operand(StackHandler::ENTRY));
     ASSERT(StackHandlerConstants::kStateOffset == 1 * kPointerSize
            && StackHandlerConstants::kFPOffset == 2 * kPointerSize
            && StackHandlerConstants::kPCOffset == 3 * kPointerSize);
     stm(db_w, sp, r6.bit() | ip.bit() | lr.bit());
     // Save the current handler as the next handler.
-    mov(r7, Operand(ExternalReference(Top::k_handler_address)));
+    mov(r7, Operand(ExternalReference(Isolate::k_handler_address)));
     ldr(r6, MemOperand(r7));
     ASSERT(StackHandlerConstants::kNextOffset == 0);
     push(r6);
     // Link this handler as the new current one.
     str(sp, MemOperand(r7));
   }
 }
 
 
 void MacroAssembler::PopTryHandler() {
   ASSERT_EQ(0, StackHandlerConstants::kNextOffset);
   pop(r1);
-  mov(ip, Operand(ExternalReference(Top::k_handler_address)));
+  mov(ip, Operand(ExternalReference(Isolate::k_handler_address)));
   add(sp, sp, Operand(StackHandlerConstants::kSize - kPointerSize));
   str(r1, MemOperand(ip));
 }
 
 
 void MacroAssembler::Throw(Register value) {
   // r0 is expected to hold the exception.
   if (!value.is(r0)) {
     mov(r0, value);
   }
 
   // Adjust this code if not the case.
   STATIC_ASSERT(StackHandlerConstants::kSize == 4 * kPointerSize);
 
   // Drop the sp to the top of the handler.
-  mov(r3, Operand(ExternalReference(Top::k_handler_address)));
+  mov(r3, Operand(ExternalReference(Isolate::k_handler_address)));
   ldr(sp, MemOperand(r3));
 
   // Restore the next handler and frame pointer, discard handler state.
   STATIC_ASSERT(StackHandlerConstants::kNextOffset == 0);
   pop(r2);
   str(r2, MemOperand(r3));
   STATIC_ASSERT(StackHandlerConstants::kFPOffset == 2 * kPointerSize);
   ldm(ia_w, sp, r3.bit() | fp.bit());  // r3: discarded state.
 
   // Before returning we restore the context from the frame pointer if
@@ skipping 18 matching lines @@
                                       Register value) {
   // Adjust this code if not the case.
   STATIC_ASSERT(StackHandlerConstants::kSize == 4 * kPointerSize);
 
   // r0 is expected to hold the exception.
   if (!value.is(r0)) {
     mov(r0, value);
   }
 
   // Drop sp to the top stack handler.
-  mov(r3, Operand(ExternalReference(Top::k_handler_address)));
+  mov(r3, Operand(ExternalReference(Isolate::k_handler_address)));
   ldr(sp, MemOperand(r3));
 
   // Unwind the handlers until the ENTRY handler is found.
   Label loop, done;
   bind(&loop);
   // Load the type of the current stack handler.
   const int kStateOffset = StackHandlerConstants::kStateOffset;
   ldr(r2, MemOperand(sp, kStateOffset));
   cmp(r2, Operand(StackHandler::ENTRY));
   b(eq, &done);
   // Fetch the next handler in the list.
   const int kNextOffset = StackHandlerConstants::kNextOffset;
   ldr(sp, MemOperand(sp, kNextOffset));
   jmp(&loop);
   bind(&done);
 
   // Set the top handler address to next handler past the current ENTRY handler.
   STATIC_ASSERT(StackHandlerConstants::kNextOffset == 0);
   pop(r2);
   str(r2, MemOperand(r3));
 
   if (type == OUT_OF_MEMORY) {
     // Set external caught exception to false.
-    ExternalReference external_caught(Top::k_external_caught_exception_address);
+    ExternalReference external_caught(
+        Isolate::k_external_caught_exception_address);
     mov(r0, Operand(false, RelocInfo::NONE));
     mov(r2, Operand(external_caught));
     str(r0, MemOperand(r2));
 
     // Set pending exception and r0 to out of memory exception.
     Failure* out_of_memory = Failure::OutOfMemoryException();
     mov(r0, Operand(reinterpret_cast<int32_t>(out_of_memory)));
-    mov(r2, Operand(ExternalReference(Top::k_pending_exception_address)));
+    mov(r2, Operand(ExternalReference(Isolate::k_pending_exception_address)));
     str(r0, MemOperand(r2));
   }
 
   // Stack layout at this point. See also StackHandlerConstants.
   // sp ->   state (ENTRY)
   //         fp
   //         lr
 
   // Discard handler state (r2 is not used) and restore frame pointer.
   STATIC_ASSERT(StackHandlerConstants::kFPOffset == 2 * kPointerSize);
@@ skipping 686 matching lines @@
 
 // Tries to get a signed int32 out of a double precision floating point heap
 // number. Rounds towards 0. Branch to 'not_int32' if the double is out of the
 // 32bits signed integer range.
 void MacroAssembler::ConvertToInt32(Register source,
                                     Register dest,
                                     Register scratch,
                                     Register scratch2,
                                     DwVfpRegister double_scratch,
                                     Label *not_int32) {
-  if (CpuFeatures::IsSupported(VFP3)) {
+  if (Isolate::Current()->cpu_features()->IsSupported(VFP3)) {
     CpuFeatures::Scope scope(VFP3);
     sub(scratch, source, Operand(kHeapObjectTag));
     vldr(double_scratch, scratch, HeapNumber::kValueOffset);
     vcvt_s32_f64(double_scratch.low(), double_scratch);
     vmov(dest, double_scratch.low());
     // Signed vcvt instruction will saturate to the minimum (0x80000000) or
     // maximun (0x7fffffff) signed 32bits integer when the double is out of
     // range. When substracting one, the minimum signed integer becomes the
     // maximun signed integer.
     sub(scratch, dest, Operand(1));
@@ skipping 75 matching lines @@
   }
 }
 
 
 void MacroAssembler::EmitVFPTruncate(VFPRoundingMode rounding_mode,
                                      SwVfpRegister result,
                                      DwVfpRegister double_input,
                                      Register scratch1,
                                      Register scratch2,
                                      CheckForInexactConversion check_inexact) {
-  ASSERT(CpuFeatures::IsSupported(VFP3));
+  ASSERT(Isolate::Current()->cpu_features()->IsSupported(VFP3));
   CpuFeatures::Scope scope(VFP3);
   Register prev_fpscr = scratch1;
   Register scratch = scratch2;
 
   int32_t check_inexact_conversion =
     (check_inexact == kCheckForInexactConversion) ? kVFPInexactExceptionBit : 0;
 
   // Set custom FPCSR:
   //  - Set rounding mode.
   //  - Clear vfp cumulative exception flags.
@@ skipping 137 matching lines @@
                               input_high,
                               input_low,
                               scratch);
   bind(&done);
 }
 
 
 void MacroAssembler::GetLeastBitsFromSmi(Register dst,
                                          Register src,
                                          int num_least_bits) {
-  if (CpuFeatures::IsSupported(ARMv7)) {
+  if (Isolate::Current()->cpu_features()->IsSupported(ARMv7)) {
     ubfx(dst, src, kSmiTagSize, num_least_bits);
   } else {
     mov(dst, Operand(src, ASR, kSmiTagSize));
     and_(dst, dst, Operand((1 << num_least_bits) - 1));
   }
 }
 
 
 void MacroAssembler::GetLeastBitsFromInt32(Register dst,
                                            Register src,
                                            int num_least_bits) {
   and_(dst, src, Operand((1 << num_least_bits) - 1));
 }
 
 
-void MacroAssembler::CallRuntime(Runtime::Function* f, int num_arguments) {
+void MacroAssembler::CallRuntime(const Runtime::Function* f,
+                                 int num_arguments) {
   // All parameters are on the stack.  r0 has the return value after call.
 
   // If the expected number of arguments of the runtime function is
   // constant, we check that the actual number of arguments match the
   // expectation.
   if (f->nargs >= 0 && f->nargs != num_arguments) {
     IllegalOperation(num_arguments);
     return;
   }
 
   // TODO(1236192): Most runtime routines don't need the number of
   // arguments passed in because it is constant. At some point we
   // should remove this need and make the runtime routine entry code
   // smarter.
   mov(r0, Operand(num_arguments));
   mov(r1, Operand(ExternalReference(f)));
   CEntryStub stub(1);
   CallStub(&stub);
 }
 
 
 void MacroAssembler::CallRuntime(Runtime::FunctionId fid, int num_arguments) {
   CallRuntime(Runtime::FunctionForId(fid), num_arguments);
 }
 
 
 void MacroAssembler::CallRuntimeSaveDoubles(Runtime::FunctionId id) {
-  Runtime::Function* function = Runtime::FunctionForId(id);
+  const Runtime::Function* function = Runtime::FunctionForId(id);
   mov(r0, Operand(function->nargs));
   mov(r1, Operand(ExternalReference(function)));
   CEntryStub stub(1);
   stub.SaveDoubles();
   CallStub(&stub);
 }
 
 
 void MacroAssembler::CallExternalReference(const ExternalReference& ext,
                                            int num_arguments) {
@@ skipping 556 matching lines @@
                                                             Register scratch,
                                                             Label* failure) {
   int kFlatAsciiStringMask =
       kIsNotStringMask | kStringEncodingMask | kStringRepresentationMask;
   int kFlatAsciiStringTag = ASCII_STRING_TYPE;
   and_(scratch, type, Operand(kFlatAsciiStringMask));
   cmp(scratch, Operand(kFlatAsciiStringTag));
   b(ne, failure);
 }
 
+static const int kRegisterPassedArguments = 4;
 
 void MacroAssembler::PrepareCallCFunction(int num_arguments, Register scratch) {
   int frame_alignment = ActivationFrameAlignment();
+
+  // Reserve space for Isolate address which is always passed as last parameter
+  num_arguments += 1;
+
   // Up to four simple arguments are passed in registers r0..r3.
-  int stack_passed_arguments = (num_arguments <= 4) ? 0 : num_arguments - 4;
+  int stack_passed_arguments = (num_arguments <= kRegisterPassedArguments) ?
+                               0 : num_arguments - kRegisterPassedArguments;
   if (frame_alignment > kPointerSize) {
     // Make stack end at alignment and make room for num_arguments - 4 words
     // and the original value of sp.
     mov(scratch, sp);
     sub(sp, sp, Operand((stack_passed_arguments + 1) * kPointerSize));
     ASSERT(IsPowerOf2(frame_alignment));
     and_(sp, sp, Operand(-frame_alignment));
     str(scratch, MemOperand(sp, stack_passed_arguments * kPointerSize));
   } else {
     sub(sp, sp, Operand(stack_passed_arguments * kPointerSize));
   }
 }
 
 
 void MacroAssembler::CallCFunction(ExternalReference function,
                                    int num_arguments) {
-  mov(ip, Operand(function));
-  CallCFunction(ip, num_arguments);
+  CallCFunctionHelper(no_reg, function, ip, num_arguments);
+}
+
+void MacroAssembler::CallCFunction(Register function,
+                                   Register scratch,
+                                   int num_arguments) {
+  CallCFunctionHelper(function,
+                      ExternalReference::the_hole_value_location(),
+                      scratch,
+                      num_arguments);
 }
 
 
-void MacroAssembler::CallCFunction(Register function, int num_arguments) {
+void MacroAssembler::CallCFunctionHelper(Register function,
+                                         ExternalReference function_reference,
+                                         Register scratch,
+                                         int num_arguments) {
+  // Push Isolate address as the last argument.
+  if (num_arguments < kRegisterPassedArguments) {
+    Register arg_to_reg[] = {r0, r1, r2, r3};
+    Register r = arg_to_reg[num_arguments];
+    mov(r, Operand(ExternalReference::isolate_address()));
+  } else {
+    int stack_passed_arguments = num_arguments - kRegisterPassedArguments;
+    // Push Isolate address on the stack after the arguments.
+    mov(scratch, Operand(ExternalReference::isolate_address()));
+    str(scratch, MemOperand(sp, stack_passed_arguments * kPointerSize));
+  }
+  num_arguments += 1;
+
   // Make sure that the stack is aligned before calling a C function unless
   // running in the simulator. The simulator has its own alignment check which
   // provides more information.
 #if defined(V8_HOST_ARCH_ARM)
   if (emit_debug_code()) {
     int frame_alignment = OS::ActivationFrameAlignment();
     int frame_alignment_mask = frame_alignment - 1;
     if (frame_alignment > kPointerSize) {
       ASSERT(IsPowerOf2(frame_alignment));
       Label alignment_as_expected;
       tst(sp, Operand(frame_alignment_mask));
       b(eq, &alignment_as_expected);
       // Don't use Check here, as it will call Runtime_Abort possibly
       // re-entering here.
       stop("Unexpected alignment");
       bind(&alignment_as_expected);
     }
   }
 #endif
 
   // Just call directly. The function called cannot cause a GC, or
   // allow preemption, so the return address in the link register
   // stays correct.
+  if (function.is(no_reg)) {
+    mov(scratch, Operand(function_reference));
+    function = scratch;
+  }
   Call(function);
-  int stack_passed_arguments = (num_arguments <= 4) ? 0 : num_arguments - 4;
+  int stack_passed_arguments = (num_arguments <= kRegisterPassedArguments) ?
+                               0 : num_arguments - kRegisterPassedArguments;
   if (OS::ActivationFrameAlignment() > kPointerSize) {
     ldr(sp, MemOperand(sp, stack_passed_arguments * kPointerSize));
   } else {
     add(sp, sp, Operand(stack_passed_arguments * sizeof(kPointerSize)));
   }
 }
 
 
 void MacroAssembler::GetRelocatedValueLocation(Register ldr_location,
                                Register result) {
@@ skipping 50 matching lines @@
 void CodePatcher::EmitCondition(Condition cond) {
   Instr instr = Assembler::instr_at(masm_.pc_);
   instr = (instr & ~kCondMask) | cond;
   masm_.emit(instr);
 }
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_ARM