[wasm] Fix linkage for PPC.

src/compiler/wasm-linkage.cc

 // Copyright 2015 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.
 
 #include "src/assembler.h"
 #include "src/macro-assembler.h"
 
 #include "src/wasm/wasm-module.h"
 
 #include "src/compiler/linkage.h"
@@ skipping 104 matching lines @@
 #define GP_RETURN_REGISTERS v0, v1
 #define FP_PARAM_REGISTERS f2, f4, f6, f8, f10, f12, f14
 #define FP_RETURN_REGISTERS f2, f4
 
 #elif V8_TARGET_ARCH_PPC || V8_TARGET_ARCH_PPC64
 // ===========================================================================
 // == ppc & ppc64 ============================================================
 // ===========================================================================
 #define GP_PARAM_REGISTERS r3, r4, r5, r6, r7, r8, r9, r10
 #define GP_RETURN_REGISTERS r3, r4
-#define FP_PARAM_REGISTERS d0, d1, d2, d3, d4, d5, d6, d7
-#define FP_RETURN_REGISTERS d0, d1
+#define FP_PARAM_REGISTERS d1, d2, d3, d4, d5, d6, d7, d8
+#define FP_RETURN_REGISTERS d1, d2
 
 #else
 // ===========================================================================
 // == unknown ================================================================
 // ===========================================================================
 // Don't define anything. We'll just always use the stack.
 #endif
 
 
 // Helper for allocating either an GP or FP reg, or the next stack slot.
@@ skipping 222 matching lines @@
       descriptor->CalleeSavedFPRegisters(),  // callee-saved fp regs
       descriptor->flags(),                   // flags
       descriptor->debug_name());
 
   return descriptor;
 }
 
 }  // namespace wasm
 }  // namespace internal
 }  // namespace v8