target-ppc/op_helper_mem.h

/*
 *  PowerPC emulation micro-operations helpers for qemu.
 *
 *  Copyright (c) 2003-2007 Jocelyn Mayer
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#include "op_mem_access.h"

/* PowerPC 601 specific instructions (POWER bridge) */
// XXX: to be tested
void glue(do_POWER_lscbx, MEMSUFFIX) (int dest, int ra, int rb)
{
    int i, c, d, reg;

    d = 24;
    reg = dest;
    for (i = 0; i < T1; i++) {
        c = glue(ldu8, MEMSUFFIX)((uint32_t)T0++);
        /* ra (if not 0) and rb are never modified */
        if (likely(reg != rb && (ra == 0 || reg != ra))) {
            env->gpr[reg] = (env->gpr[reg] & ~(0xFF << d)) | (c << d);
        }
        if (unlikely(c == T2))
            break;
        if (likely(d != 0)) {
            d -= 8;
        } else {
            d = 24;
            reg++;
            reg = reg & 0x1F;
        }
    }
    T0 = i;
}

#undef MEMSUFFIX