Contribution of PowerPC port (continuation of 422063005) - PPC dir update

src/compiler/ppc/linkage-ppc.cc

Index: src/compiler/ppc/linkage-ppc.cc
diff --git a/src/compiler/arm64/linkage-arm64.cc b/src/compiler/ppc/linkage-ppc.cc
similarity index 72%
copy from src/compiler/arm64/linkage-arm64.cc
copy to src/compiler/ppc/linkage-ppc.cc
index 352a4bcd969c50873235f7175c47cbbf9f6b9e22..96dcaaa5b2bc6df16b438ce94d70de1833da2a6a 100644
--- a/src/compiler/arm64/linkage-arm64.cc
+++ b/src/compiler/ppc/linkage-ppc.cc
@@ -14,26 +14,28 @@ namespace v8 {
 namespace internal {
 namespace compiler {
 
-struct Arm64LinkageHelperTraits {
-  static Register ReturnValueReg() { return x0; }
-  static Register ReturnValue2Reg() { return x1; }
-  static Register JSCallFunctionReg() { return x1; }
+struct PPCLinkageHelperTraits {
+  static Register ReturnValueReg() { return r3; }
+  static Register ReturnValue2Reg() { return r4; }
+  static Register JSCallFunctionReg() { return r4; }
   static Register ContextReg() { return cp; }
-  static Register RuntimeCallFunctionReg() { return x1; }
-  static Register RuntimeCallArgCountReg() { return x0; }
+  static Register RuntimeCallFunctionReg() { return r4; }
+  static Register RuntimeCallArgCountReg() { return r3; }
   static RegList CCalleeSaveRegisters() {
-    // TODO(dcarney): correct callee saved registers.
-    return 0;
+    return r14.bit() | r15.bit() | r16.bit() | r17.bit() | r18.bit() |
+           r19.bit() | r20.bit() | r21.bit() | r22.bit() | r23.bit() |
+           r24.bit() | r25.bit() | r26.bit() | r27.bit() | r28.bit() |
+           r29.bit() | r30.bit() | fp.bit();
   }
   static Register CRegisterParameter(int i) {
-    static Register register_parameters[] = {x0, x1, x2, x3, x4, x5, x6, x7};
+    static Register register_parameters[] = {r3, r4, r5, r6, r7, r8, r9, r10};
     return register_parameters[i];
   }
   static int CRegisterParametersLength() { return 8; }
 };
 
 
-typedef LinkageHelper<Arm64LinkageHelperTraits> LH;
+typedef LinkageHelper<PPCLinkageHelperTraits> LH;
 
 CallDescriptor* Linkage::GetJSCallDescriptor(Zone* zone, bool is_osr,
                                              int parameter_count,