/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
 * This file is part of the LibreOffice project.
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
 *
 * This file incorporates work covered by the following license notice:
 *
 *   Licensed to the Apache Software Foundation (ASF) under one or more
 *   contributor license agreements. See the NOTICE file distributed
 *   with this work for additional information regarding copyright
 *   ownership. The ASF licenses this file to you under the Apache
 *   License, Version 2.0 (the "License"); you may not use this file
 *   except in compliance with the License. You may obtain a copy of
 *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
 */

#include <sal/config.h>

#include <cstring>

#include <sal/types.h>
#include <sal/alloca.h>

#include <callvirtualfunction.hxx>

void callVirtualFunction(
    unsigned long function, unsigned long * gpr, unsigned long * fpr,
    unsigned long * stack, sal_Int32 sp, void * ret)
{
    void * stackargs;
    if (sp != 0) {
        stackargs = alloca(((sp + 1) >> 1) * 16);
        std::memcpy(stackargs, stack, sp * 8);
    }
    asm volatile(
        "ldp x0, x1, [%[gpr_]]\n\t"
        "ldp x2, x3, [%[gpr_], #16]\n\t"
        "ldp x4, x5, [%[gpr_], #32]\n\t"
        "ldp x6, x7, [%[gpr_], #48]\n\t"
        "ldr x8, %[ret_]\n\t"
        "ldr x9, %[function_]\n\t"
        "ldp d0, d1, [%[fpr_]]\n\t"
        "ldp d2, d3, [%[fpr_], #16]\n\t"
        "ldp d4, d5, [%[fpr_], #32]\n\t"
        "ldp d6, d7, [%[fpr_], #48]\n\t"
        "blr x9\n\t"
        "stp x0, x1, [%[gpr_]]\n\t"
        "stp d0, d1, [%[fpr_]]\n\t"
        "stp d2, d3, [%[fpr_], #16]\n\t"
        :: [gpr_]"r" (gpr), [fpr_]"r" (fpr), [function_]"m" (function),
           [ret_]"m" (ret),
           "m" (stackargs) // dummy input to prevent optimizing the alloca away
        : "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", "r8", "r9", "r10",
          "r11", "r12", "r13", "r14", "r15", "r16", "r17", "r18"/*TODO?*/, "v0",
          "v1", "v2", "v3", "v4", "v5", "v6", "v7", "v8", "v9", "v10", "v11",
          "v12", "v13", "v14", "v15", "v16", "v17", "v18", "v19", "v20", "v21",
          "v22", "v23", "v24", "v25", "v26", "v27", "v28", "v29", "v30", "v31",
          "memory"
          // only the bottom 64 bits of v8--15 need to be preserved by callees
    );
}

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