51 lines
1.5 KiB
C
51 lines
1.5 KiB
C
/*
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* PowerPC emulation micro-operations helpers for qemu.
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*
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* Copyright (c) 2003-2007 Jocelyn Mayer
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include "op_mem_access.h"
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/* PowerPC 601 specific instructions (POWER bridge) */
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// XXX: to be tested
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void glue(do_POWER_lscbx, MEMSUFFIX) (int dest, int ra, int rb)
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{
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int i, c, d, reg;
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d = 24;
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reg = dest;
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for (i = 0; i < T1; i++) {
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c = glue(ldu8, MEMSUFFIX)((uint32_t)T0++);
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/* ra (if not 0) and rb are never modified */
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if (likely(reg != rb && (ra == 0 || reg != ra))) {
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env->gpr[reg] = (env->gpr[reg] & ~(0xFF << d)) | (c << d);
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}
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if (unlikely(c == T2))
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break;
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if (likely(d != 0)) {
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d -= 8;
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} else {
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d = 24;
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reg++;
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reg = reg & 0x1F;
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}
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}
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T0 = i;
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}
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#undef MEMSUFFIX
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