tcg-op-ldst.c

/*
 * Tiny Code Generator for QEMU
 *
 * Copyright (c) 2008 Fabrice Bellard
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */

#include "qemu/osdep.h"
#include "tcg/tcg.h"
#include "tcg/tcg-temp-internal.h"
#include "tcg/tcg-op-common.h"
#include "tcg/tcg-mo.h"
#include "exec/translation-block.h"
#include "exec/plugin-gen.h"
#include "tcg-internal.h"


static void check_max_alignment(unsigned a_bits)
{
#if defined(CONFIG_SOFTMMU)
    /*
     * The requested alignment cannot overlap the TLB flags.
     * FIXME: Must keep the count up-to-date with "exec/cpu-all.h".
     */
    tcg_debug_assert(a_bits + 5 <= tcg_ctx->page_bits);
#endif
}

static MemOp tcg_canonicalize_memop(MemOp op, bool is64, bool st)
{
    unsigned a_bits = get_alignment_bits(op);

    check_max_alignment(a_bits);

    /* Prefer MO_ALIGN+MO_XX over MO_ALIGN_XX+MO_XX */
    if (a_bits == (op & MO_SIZE)) {
        op = (op & ~MO_AMASK) | MO_ALIGN;
    }

    switch (op & MO_SIZE) {
    case MO_8:
        op &= ~MO_BSWAP;
        break;
    case MO_16:
        break;
    case MO_32:
        if (!is64) {
            op &= ~MO_SIGN;
        }
        break;
    case MO_64:
        if (is64) {
            op &= ~MO_SIGN;