PPC: [Interpreter] Add CallRuntime support to the interpreter.

src/ppc/code-stubs-ppc.cc

 // Copyright 2014 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_PPC
 
 #include "src/base/bits.h"
 #include "src/bootstrapper.h"
 #include "src/code-stubs.h"
 #include "src/codegen.h"
@@ skipping 1016 matching lines @@
 }
 
 
 void CEntryStub::Generate(MacroAssembler* masm) {
   // Called from JavaScript; parameters are on stack as if calling JS function.
   // r3: number of arguments including receiver
   // r4: pointer to builtin function
   // fp: frame pointer  (restored after C call)
   // sp: stack pointer  (restored as callee's sp after C call)
   // cp: current context  (C callee-saved)
-
+  //
+  // If argv_in_register():
+  // r5: pointer to the first argument
   ProfileEntryHookStub::MaybeCallEntryHook(masm);
 
   __ mr(r15, r4);
 
-  // Compute the argv pointer.
-  __ ShiftLeftImm(r4, r3, Operand(kPointerSizeLog2));
-  __ add(r4, r4, sp);
-  __ subi(r4, r4, Operand(kPointerSize));
+  if (argv_in_register()) {
+    // Move argv into the correct register.
+    __ mr(r4, r5);
+  } else {
+    // Compute the argv pointer.
+    __ ShiftLeftImm(r4, r3, Operand(kPointerSizeLog2));
+    __ add(r4, r4, sp);
+    __ subi(r4, r4, Operand(kPointerSize));
+  }
 
   // Enter the exit frame that transitions from JavaScript to C++.
   FrameScope scope(masm, StackFrame::MANUAL);
 
   // Need at least one extra slot for return address location.
   int arg_stack_space = 1;
 
 // PPC LINUX ABI:
 #if !ABI_RETURNS_OBJECT_PAIRS_IN_REGS
   // Pass buffer for return value on stack if necessary
@@ skipping 78 matching lines @@
     // Cannot use check here as it attempts to generate call into runtime.
     __ beq(&okay);
     __ stop("Unexpected pending exception");
     __ bind(&okay);
   }
 
   // Exit C frame and return.
   // r3:r4: result
   // sp: stack pointer
   // fp: frame pointer
-  // r14: still holds argc (callee-saved).
-  __ LeaveExitFrame(save_doubles(), r14, true);
+  Register argc;
+  if (argv_in_register()) {
+    // We don't want to pop arguments so set argc to no_reg.
+    argc = no_reg;
+  } else {
+    // r14: still holds argc (callee-saved).
+    argc = r14;
+  }
+  __ LeaveExitFrame(save_doubles(), argc, true);
   __ blr();
 
   // Handling of exception.
   __ bind(&exception_returned);
 
   ExternalReference pending_handler_context_address(
       Isolate::kPendingHandlerContextAddress, isolate());
   ExternalReference pending_handler_code_address(
       Isolate::kPendingHandlerCodeAddress, isolate());
   ExternalReference pending_handler_offset_address(
@@ skipping 4671 matching lines @@
                            kStackUnwindSpace, NULL,
                            MemOperand(fp, 6 * kPointerSize), NULL);
 }
 
 
 #undef __
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_PPC