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781 lines
14 KiB
C
781 lines
14 KiB
C
/* srcdest.c --- decoding M32C addressing modes.
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Copyright (C) 2005-2017 Free Software Foundation, Inc.
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Contributed by Red Hat, Inc.
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This file is part of the GNU simulators.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program 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
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#include <stdio.h>
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#include <stdlib.h>
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#include "cpu.h"
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#include "mem.h"
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static int src_indirect = 0;
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static int dest_indirect = 0;
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static int src_addend = 0;
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static int dest_addend = 0;
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static int
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disp8 (void)
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{
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int rv;
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int tsave = trace;
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if (trace == 1)
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trace = 0;
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rv = mem_get_qi (get_reg (pc));
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regs.r_pc++;
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trace = tsave;
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return rv;
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}
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static int
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disp16 (void)
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{
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int rv;
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int tsave = trace;
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if (trace == 1)
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trace = 0;
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rv = mem_get_hi (get_reg (pc));
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regs.r_pc += 2;
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trace = tsave;
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return rv;
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}
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static int
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disp24 (void)
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{
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int rv;
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int tsave = trace;
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if (trace == 1)
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trace = 0;
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rv = mem_get_psi (get_reg (pc));
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regs.r_pc += 3;
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trace = tsave;
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return rv;
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}
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static int
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disp20 (void)
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{
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return disp24 () & 0x000fffff;
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}
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const char *
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bits (int v, int b)
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{
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static char buf[17];
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char *bp = buf + 16;
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*bp = 0;
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while (b)
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{
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*--bp = (v & 1) ? '1' : '0';
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v >>= 1;
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b--;
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}
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return bp;
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}
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static const char *the_bits = 0;
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void
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decode_indirect (int si, int di)
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{
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src_indirect = si;
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dest_indirect = di;
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if (trace && (si || di))
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printf ("indirect: s:%d d:%d\n", si, di);
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}
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void
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decode_index (int sa, int da)
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{
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src_addend = sa;
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dest_addend = da;
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if (trace && (sa || da))
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printf ("index: s:%d d:%d\n", sa, da);
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}
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srcdest
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decode_srcdest4 (int destcode, int bw)
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{
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srcdest sd;
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static const char *dc_wnames[16] = { "r0", "r1", "r2", "r3",
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"a0", "a1", "[a0]", "[a1]",
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"disp8[a0]", "disp8[a1]", "disp8[sb]", "disp8[fb]",
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"disp16[a0]", "disp16[a1]", "disp16[sb]", "disp16"
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};
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static const char *dc_bnames[4] = { "r0l", "r0h", "r1l", "r1h" };;
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sd.bytes = bw ? 2 : 1;
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sd.mem = (destcode >= 6) ? 1 : 0;
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if (trace)
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{
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const char *n = dc_wnames[destcode];
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if (bw == 0 && destcode <= 3)
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n = dc_bnames[destcode];
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if (!the_bits)
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the_bits = bits (destcode, 4);
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printf ("decode: %s (%d) : %s\n", the_bits, destcode, n);
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the_bits = 0;
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}
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switch (destcode)
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{
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case 0x0:
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sd.u.reg = bw ? r0 : r0l;
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break;
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case 0x1:
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sd.u.reg = bw ? r1 : r0h;
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break;
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case 0x2:
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sd.u.reg = bw ? r2 : r1l;
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break;
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case 0x3:
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sd.u.reg = bw ? r3 : r1h;
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break;
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case 0x4:
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sd.u.reg = a0;
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break;
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case 0x5:
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sd.u.reg = a1;
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break;
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case 0x6:
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sd.u.addr = get_reg (a0);
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break;
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case 0x7:
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sd.u.addr = get_reg (a1);
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break;
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case 0x8:
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sd.u.addr = get_reg (a0) + disp8 ();
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break;
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case 0x9:
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sd.u.addr = get_reg (a1) + disp8 ();
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break;
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case 0xa:
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sd.u.addr = get_reg (sb) + disp8 ();
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break;
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case 0xb:
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sd.u.addr = get_reg (fb) + sign_ext (disp8 (), 8);
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break;
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case 0xc:
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sd.u.addr = get_reg (a0) + disp16 ();
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break;
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case 0xd:
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sd.u.addr = get_reg (a1) + disp16 ();
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break;
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case 0xe:
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sd.u.addr = get_reg (sb) + disp16 ();
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break;
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case 0xf:
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sd.u.addr = disp16 ();
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break;
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default:
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abort ();
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}
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if (sd.mem)
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sd.u.addr &= addr_mask;
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return sd;
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}
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srcdest
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decode_jumpdest (int destcode, int w)
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{
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srcdest sd;
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static const char *dc_wnames[16] = { "r0", "r1", "r2", "r3",
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"a0", "a1", "[a0]", "[a1]",
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"disp8[a0]", "disp8[a1]", "disp8[sb]", "disp8[fb]",
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"disp20[a0]", "disp20[a1]", "disp16[sb]", "abs16"
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};
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static const char *dc_anames[4] = { "r0l", "r0h", "r1l", "r1h" };
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sd.bytes = w ? 2 : 3;
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sd.mem = (destcode >= 6) ? 1 : 0;
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if (trace)
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{
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const char *n = dc_wnames[destcode];
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if (w == 0 && destcode <= 3)
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n = dc_anames[destcode];
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if (!the_bits)
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the_bits = bits (destcode, 4);
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printf ("decode: %s : %s\n", the_bits, n);
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the_bits = 0;
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}
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switch (destcode)
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{
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case 0x0:
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sd.u.reg = w ? r0 : r2r0;
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break;
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case 0x1:
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sd.u.reg = w ? r1 : r2r0;
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break;
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case 0x2:
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sd.u.reg = w ? r2 : r3r1;
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break;
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case 0x3:
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sd.u.reg = w ? r3 : r3r1;
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break;
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case 0x4:
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sd.u.reg = w ? a0 : a1a0;
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break;
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case 0x5:
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sd.u.reg = w ? a1 : a1a0;
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break;
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case 0x6:
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sd.u.addr = get_reg (a0);
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break;
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case 0x7:
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sd.u.addr = get_reg (a1);
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break;
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case 0x8:
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sd.u.addr = get_reg (a0) + disp8 ();
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break;
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case 0x9:
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sd.u.addr = get_reg (a1) + disp8 ();
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break;
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case 0xa:
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sd.u.addr = get_reg (sb) + disp8 ();
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break;
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case 0xb:
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sd.u.addr = get_reg (fb) + sign_ext (disp8 (), 8);
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break;
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case 0xc:
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sd.u.addr = get_reg (a0) + disp20 ();
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break;
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case 0xd:
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sd.u.addr = get_reg (a1) + disp20 ();
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break;
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case 0xe:
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sd.u.addr = get_reg (sb) + disp16 ();
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break;
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case 0xf:
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sd.u.addr = disp16 ();
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break;
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default:
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abort ();
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}
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if (sd.mem)
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sd.u.addr &= addr_mask;
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return sd;
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}
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srcdest
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decode_dest3 (int destcode, int bw)
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{
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static char map[8] = { -1, -1, -1, 1, 0, 10, 11, 15 };
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the_bits = bits (destcode, 3);
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return decode_srcdest4 (map[destcode], bw);
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}
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srcdest
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decode_src2 (int srccode, int bw, int d)
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{
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static char map[4] = { 0, 10, 11, 15 };
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the_bits = bits (srccode, 2);
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return decode_srcdest4 (srccode ? map[srccode] : 1 - d, bw);
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}
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static struct
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{
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reg_id b_regno;
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reg_id w_regno;
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int is_memory;
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int disp_bytes;
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char *name;
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} modes23[] =
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{
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{
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a0, a0, 1, 0, "[A0]"}, /* 0 0 0 0 0 */
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{
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a1, a1, 1, 0, "[A1]"}, /* 0 0 0 0 1 */
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{
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a0, a0, 0, 0, "A0"}, /* 0 0 0 1 0 */
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{
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a1, a1, 0, 0, "A1"}, /* 0 0 0 1 1 */
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{
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a0, a0, 1, 1, "dsp:8[A0]"}, /* 0 0 1 0 0 */
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{
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a1, a1, 1, 1, "dsp:8[A1]"}, /* 0 0 1 0 1 */
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{
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sb, sb, 1, 1, "dsp:8[SB]"}, /* 0 0 1 1 0 */
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{
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fb, fb, 1, -1, "dsp:8[FB]"}, /* 0 0 1 1 1 */
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{
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a0, a0, 1, 2, "dsp:16[A0]"}, /* 0 1 0 0 0 */
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{
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a1, a1, 1, 2, "dsp:16[A1]"}, /* 0 1 0 0 1 */
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{
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sb, sb, 1, 2, "dsp:16[SB]"}, /* 0 1 0 1 0 */
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{
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fb, fb, 1, -2, "dsp:16[FB]"}, /* 0 1 0 1 1 */
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{
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a0, a0, 1, 3, "dsp:24[A0]"}, /* 0 1 1 0 0 */
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{
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a1, a1, 1, 3, "dsp:24[A1]"}, /* 0 1 1 0 1 */
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{
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mem, mem, 1, 3, "abs24"}, /* 0 1 1 1 0 */
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{
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mem, mem, 1, 2, "abs16"}, /* 0 1 1 1 1 */
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{
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r0h, r2, 0, 0, "R0H/R2"}, /* 1 0 0 0 0 */
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{
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r1h, r3, 0, 0, "R1H/R3"}, /* 1 0 0 0 1 */
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{
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r0l, r0, 0, 0, "R0L/R0"}, /* 1 0 0 1 0 */
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{
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r1l, r1, 0, 0, "R1L/R1"}, /* 1 0 0 1 1 */
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};
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static srcdest
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decode_sd23 (int bbb, int bb, int bytes, int ind, int add)
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{
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srcdest sd;
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int code = (bbb << 2) | bb;
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if (code >= sizeof (modes23) / sizeof (modes23[0]))
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abort ();
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if (trace)
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{
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char *b1 = "";
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char *b2 = "";
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char ad[30];
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if (ind)
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{
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b1 = "[";
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b2 = "]";
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}
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if (add)
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sprintf (ad, "%+d", add);
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else
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ad[0] = 0;
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if (!the_bits)
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the_bits = bits (code, 4);
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printf ("decode: %s (%d) : %s%s%s%s\n", the_bits, code, b1,
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modes23[code].name, ad, b2);
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the_bits = 0;
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}
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sd.bytes = bytes;
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sd.mem = modes23[code].is_memory;
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if (sd.mem)
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{
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if (modes23[code].w_regno == mem)
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sd.u.addr = 0;
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else
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sd.u.addr = get_reg (modes23[code].w_regno);
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switch (modes23[code].disp_bytes)
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{
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case 1:
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sd.u.addr += disp8 ();
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break;
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case 2:
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sd.u.addr += disp16 ();
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break;
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case -1:
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sd.u.addr += sign_ext (disp8 (), 8);
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break;
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case -2:
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sd.u.addr += sign_ext (disp16 (), 16);
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break;
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case 3:
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sd.u.addr += disp24 ();
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break;
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default:
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break;
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}
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if (add)
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sd.u.addr += add;
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if (ind)
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sd.u.addr = mem_get_si (sd.u.addr & membus_mask);
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sd.u.addr &= membus_mask;
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}
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else
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{
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sd.u.reg = (bytes > 1) ? modes23[code].w_regno : modes23[code].b_regno;
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if (bytes == 3 || bytes == 4)
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{
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switch (sd.u.reg)
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{
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case r0:
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sd.u.reg = r2r0;
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break;
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case r1:
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sd.u.reg = r3r1;
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break;
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case r2:
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abort ();
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case r3:
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abort ();
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default:;
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}
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}
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}
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return sd;
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}
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srcdest
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decode_dest23 (int ddd, int dd, int bytes)
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{
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return decode_sd23 (ddd, dd, bytes, dest_indirect, dest_addend);
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}
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srcdest
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decode_src23 (int sss, int ss, int bytes)
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{
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return decode_sd23 (sss, ss, bytes, src_indirect, src_addend);
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}
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srcdest
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decode_dest2 (int dd, int bytes)
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{
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/* r0l/r0, abs16, dsp:8[SB], dsp:8[FB] */
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static char map[4] = { 0x12, 0x0f, 0x06, 0x07 };
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the_bits = bits (dd, 2);
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return decode_sd23 (map[dd] >> 2, map[dd] & 3, bytes, dest_indirect,
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dest_addend);
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}
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srcdest
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decode_src3 (int sss, int bytes)
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{
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/* r0, r1, a0, a1, r2, r3, N/A, N/A */
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static char map[8] = { 0x12, 0x13, 0x02, 0x03, 0x10, 0x11, 0, 0 };
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the_bits = bits (sss, 3);
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return decode_sd23 (map[sss] >> 2, map[sss] & 3, bytes, src_indirect,
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src_addend);
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}
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srcdest
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decode_dest1 (int destcode, int bw)
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{
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the_bits = bits (destcode, 1);
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return decode_srcdest4 (destcode, bw);
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}
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srcdest
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decode_cr (int crcode)
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{
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static int regcode[] = { 0, intbl, intbh, flags, isp, sp, sb, fb };
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srcdest sd;
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sd.mem = 0;
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sd.bytes = 2;
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sd.u.reg = regcode[crcode & 7];
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return sd;
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}
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srcdest
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decode_cr_b (int crcode, int bank)
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{
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/* FIXME: intbl, intbh, isp */
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static int regcode[3][8] = {
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{0, 0, flags, 0, 0, 0, 0, 0},
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{intb, sp, sb, fb, 0, 0, 0, isp},
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{0, 0, 0, 0, 0, 0, 0, 0}
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};
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srcdest sd;
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sd.mem = 0;
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sd.bytes = bank ? 3 : 2;
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sd.u.reg = regcode[bank][crcode & 7];
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return sd;
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}
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srcdest
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widen_sd (srcdest sd)
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{
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sd.bytes *= 2;
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if (!sd.mem)
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switch (sd.u.reg)
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{
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case r0l:
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sd.u.reg = r0;
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break;
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case r0:
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sd.u.reg = r2r0;
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break;
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case r1l:
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sd.u.reg = r1;
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break;
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case r1:
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sd.u.reg = r3r1;
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break;
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case a0:
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if (A16)
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sd.u.reg = a1a0;
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break;
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default:
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break;
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}
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return sd;
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}
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srcdest
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reg_sd (reg_id reg)
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{
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srcdest rv;
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rv.bytes = reg_bytes[reg];
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rv.mem = 0;
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rv.u.reg = reg;
|
|
return rv;
|
|
}
|
|
|
|
int
|
|
get_src (srcdest sd)
|
|
{
|
|
int v;
|
|
if (sd.mem)
|
|
{
|
|
switch (sd.bytes)
|
|
{
|
|
case 1:
|
|
v = mem_get_qi (sd.u.addr);
|
|
break;
|
|
case 2:
|
|
v = mem_get_hi (sd.u.addr);
|
|
break;
|
|
case 3:
|
|
v = mem_get_psi (sd.u.addr);
|
|
break;
|
|
case 4:
|
|
v = mem_get_si (sd.u.addr);
|
|
break;
|
|
default:
|
|
abort ();
|
|
}
|
|
}
|
|
else
|
|
{
|
|
v = get_reg (sd.u.reg);
|
|
switch (sd.bytes)
|
|
{
|
|
case 1:
|
|
v &= 0xff;
|
|
break;
|
|
case 2:
|
|
v &= 0xffff;
|
|
break;
|
|
case 3:
|
|
v &= 0xffffff;
|
|
break;
|
|
}
|
|
}
|
|
return v;
|
|
}
|
|
|
|
void
|
|
put_dest (srcdest sd, int v)
|
|
{
|
|
if (sd.mem)
|
|
{
|
|
switch (sd.bytes)
|
|
{
|
|
case 1:
|
|
mem_put_qi (sd.u.addr, v);
|
|
break;
|
|
case 2:
|
|
mem_put_hi (sd.u.addr, v);
|
|
break;
|
|
case 3:
|
|
mem_put_psi (sd.u.addr, v);
|
|
break;
|
|
case 4:
|
|
mem_put_si (sd.u.addr, v);
|
|
break;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
switch (sd.bytes)
|
|
{
|
|
case 1:
|
|
v &= 0xff;
|
|
break;
|
|
case 2:
|
|
v &= 0xffff;
|
|
break;
|
|
case 3:
|
|
v &= 0xffffff;
|
|
break;
|
|
}
|
|
put_reg (sd.u.reg, v);
|
|
}
|
|
}
|
|
|
|
srcdest
|
|
decode_bit (int destcode)
|
|
{
|
|
srcdest sd;
|
|
int addr = 0;
|
|
static const char *dc_names[] = { "r0", "r1", "r2", "r3",
|
|
"a0", "a1", "[a0]", "[a1]",
|
|
"disp8[a0]", "disp8[a1]", "disp8[sb]", "disp8[fb]",
|
|
"disp16[a0]", "disp16[a1]", "disp16[sb]", "abs16"
|
|
};
|
|
|
|
if (trace)
|
|
{
|
|
const char *the_bits = bits (destcode, 4);
|
|
printf ("decode: %s : %s\n", the_bits, dc_names[destcode]);
|
|
}
|
|
|
|
switch (destcode)
|
|
{
|
|
case 0:
|
|
sd.u.reg = r0;
|
|
break;
|
|
case 1:
|
|
sd.u.reg = r1;
|
|
break;
|
|
case 2:
|
|
sd.u.reg = r2;
|
|
break;
|
|
case 3:
|
|
sd.u.reg = r3;
|
|
break;
|
|
case 4:
|
|
sd.u.reg = a0;
|
|
break;
|
|
case 5:
|
|
sd.u.reg = a1;
|
|
break;
|
|
case 6:
|
|
addr = get_reg (a0);
|
|
break;
|
|
case 7:
|
|
addr = get_reg (a1);
|
|
break;
|
|
case 8:
|
|
addr = get_reg (a0) + disp8 ();
|
|
break;
|
|
case 9:
|
|
addr = get_reg (a1) + disp8 ();
|
|
break;
|
|
case 10:
|
|
addr = get_reg (sb) * 8 + disp8 ();
|
|
break;
|
|
case 11:
|
|
addr = get_reg (fb) * 8 + sign_ext (disp8 (), 8);
|
|
break;
|
|
case 12:
|
|
addr = get_reg (a0) + disp16 ();
|
|
break;
|
|
case 13:
|
|
addr = get_reg (a1) + disp16 ();
|
|
break;
|
|
case 14:
|
|
addr = get_reg (sb) + disp16 ();
|
|
break;
|
|
case 15:
|
|
addr = disp16 ();
|
|
break;
|
|
}
|
|
|
|
if (destcode < 6)
|
|
{
|
|
int d = disp8 ();
|
|
sd.mem = 0;
|
|
sd.mask = 1 << (d & 0x0f);
|
|
}
|
|
else
|
|
{
|
|
addr &= addr_mask;
|
|
sd.mem = 1;
|
|
sd.mask = 1 << (addr & 7);
|
|
sd.u.addr = addr >> 3;
|
|
}
|
|
return sd;
|
|
}
|
|
|
|
srcdest
|
|
decode_bit11 (int op0)
|
|
{
|
|
srcdest sd;
|
|
sd.mask = 1 << (op0 & 7);
|
|
sd.mem = 1;
|
|
sd.u.addr = get_reg (sb) + disp8 ();
|
|
return sd;
|
|
}
|
|
|
|
int
|
|
get_bit (srcdest sd)
|
|
{
|
|
int b;
|
|
if (sd.mem)
|
|
b = mem_get_qi (sd.u.addr) & sd.mask;
|
|
else
|
|
b = get_reg (sd.u.reg) & sd.mask;
|
|
return b ? 1 : 0;
|
|
}
|
|
|
|
void
|
|
put_bit (srcdest sd, int val)
|
|
{
|
|
int b;
|
|
if (sd.mem)
|
|
b = mem_get_qi (sd.u.addr);
|
|
else
|
|
b = get_reg (sd.u.reg);
|
|
if (val)
|
|
b |= sd.mask;
|
|
else
|
|
b &= ~sd.mask;
|
|
if (sd.mem)
|
|
mem_put_qi (sd.u.addr, b);
|
|
else
|
|
put_reg (sd.u.reg, b);
|
|
}
|
|
|
|
int
|
|
get_bit2 (srcdest sd, int bit)
|
|
{
|
|
int b;
|
|
if (sd.mem)
|
|
b = mem_get_qi (sd.u.addr + (bit >> 3)) & (1 << (bit & 7));
|
|
else
|
|
b = get_reg (sd.u.reg) & (1 << bit);
|
|
return b ? 1 : 0;
|
|
}
|
|
|
|
void
|
|
put_bit2 (srcdest sd, int bit, int val)
|
|
{
|
|
int b;
|
|
if (sd.mem)
|
|
b = mem_get_qi (sd.u.addr + (bit >> 3));
|
|
else
|
|
b = get_reg (sd.u.reg);
|
|
if (val)
|
|
b |= (1 << (bit & 7));
|
|
else
|
|
b &= ~(1 << (bit & 7));
|
|
if (sd.mem)
|
|
mem_put_qi (sd.u.addr + (bit >> 3), b);
|
|
else
|
|
put_reg (sd.u.reg, b);
|
|
}
|