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/* pdk14mch.c */
/*
* Copyright (C) 1998-2011 Alan R. Baldwin
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*
* Alan R. Baldwin
* 721 Berkeley St.
* Kent, Ohio 44240
*
* This Assember Ported by
* John L. Hartman (JLH)
* jhartman at compuserve dot com
* noice at noicedebugger dot com
*
* Benny Kim (2011/07/21)
* bennykim at coreriver dot com
* Fixed bugs in relative address with "."
*/
#include "sdas.h"
#include "asxxxx.h"
#include "pdk.h"
char *cpu = "Padauk 13";
char *dsft = "asm";
/*
* Process machine ops.
*/
VOID
machine(struct mne *mp)
{
a_uint op;
int combine;
/* Set the target in case it was not automatically
* configured from the executable filename.
*/
set_sdas_target (TARGET_ID_PDK13);
op = mp->m_valu;
combine = 0;
/* Default instructions are only used for A -> K instructions.
* Although they may be (ab)used for other types.
*/
struct inst def = {op, 0xFF};
switch (mp->m_type) {
case S_MOV: {
struct inst ioa = {0x0080, 0x1F};
struct inst aio = {0x00A0, 0x1F};
struct inst ma = {0x05C0, 0x3F};
struct inst am = {0x07C0, 0x3F};
emov(def, ioa, aio, ma, am);
break;
}
case S_IDXM: {
struct inst am = {op | 1, 0x1E};
struct inst ma = {op, 0x1E};
eidxm(am, ma);
break;
}
case S_SUB:
combine = 0x40;
/* fallthrough */
case S_ADD: {
struct inst ma = {0x0400 | combine, 0x3F};
struct inst am = {0x0600 | combine, 0x3F};
earith(def, ma, am);
break;
}
case S_SUBC:
combine = 0x40;
/* fallthrough */
case S_ADDC: {
struct inst ma = {0x0480 | combine, 0x3F};
struct inst am = {0x0680 | combine, 0x3F};
struct inst a = {0x0010 + (combine >> 6), 0x00};
struct inst m = {0x0800 + combine, 0x3F};
earithc(ma, am, m, a);
break;
}
case S_SLC:
case S_SRC:
case S_SL:
case S_SR: {
if (mp->m_type == S_SRC || mp->m_type == S_SLC)
combine = 2;
if (mp->m_type == S_SL || mp->m_type == S_SLC)
combine += 1;
struct inst a = {0x001A + combine, 0x00};
struct inst m = {0x0A80 + (combine << 6), 0x3F};
eshift(a, m);
break;
}
case S_OR:
case S_XOR:
case S_AND: {
if (mp->m_type == S_OR) {
combine = 0x40;
} else
if (mp->m_type == S_XOR) {
combine = 0x80;
}
struct inst ma = {0x0500 | combine, 0x3F};
struct inst am = {0x0700 | combine, 0x3F};
struct inst ioa = {0x0060, 0x1F};
ebit(def, ma, am, mp->m_type == S_XOR ? &ioa : NULL);
break;
}
case S_NEG:
combine = 0x40;
/* fallthrough */
case S_NOT: {
struct inst m = {0x0A00 | combine, 0x3F};
enot(def, m);
break;
}
case S_SET1: {
struct inst io = {0x0F00, 0x1F};
struct inst m = {0x0310, 0x0F};
ebitn(io, m, /*N offset*/5);
break;
}
case S_SET0: {
struct inst io = {0x0E00, 0x1F};
struct inst m = {0x0300, 0x0F};
ebitn(io, m, /*N offset*/5);
break;
}
case S_CEQSN: {
struct inst m = {0x0B80, 0xFF};
def.op |= combine << 2;
eskip(def, m);
break;
}
case S_T1SN: {
struct inst io = {0x0D00, 0x1F};
struct inst m = {0x0210, 0x0F};
ebitn(io, m, /*N offset*/5);
break;
}
case S_T0SN: {
struct inst io = {0x0C00, 0x1F};
struct inst m = {0x0200, 0x0F};
ebitn(io, m, /*N offset*/5);
break;
}
case S_DZSN:
combine = 0x40;
/* fallthrough */
case S_IZSN: {
struct inst m = {0x0880 | combine, 0x3F};
ezsn(def, m);
break;
}
case S_RET: {
struct inst k = {0x0100, 0xFF};
eret(def, k);
break;
}
case S_INC:
case S_DEC:
case S_CLEAR:
def.mask = 0x3F;
eone(def);
break;
case S_CALL:
case S_GOTO: {
struct expr e;
clrexpr(&e);
waddrmode = 1;
expr(&e, 0);
waddrmode = 0;
outrwp(&e, def.op, 0x3FF, /*jump=*/1);
break;
}
case S_XCH:
def.mask = 0x3F;
exch(def);
break;
case S_PUSHAF:
case S_POPAF:
epupo(def);
break;
case S_LDT16:
case S_STT16:
def.mask = 0x3E;
eone(def);
break;
case S_SWAP:
case S_PCADD:
eopta(def);
break;
/* Simple instructions consisting of only one opcode and no args */
case S_RETI:
case S_NOP:
case S_ENGINT:
case S_DISGINT:
case S_STOPSYS:
case S_STOPEXE:
case S_RESET:
case S_WDRESET:
case S_MUL:
case S_LDSPTL: /* undocumented */
case S_LDSPTH: /* undocumented */
outaw(op);
break;
}
}
/*
* Machine specific initialization
*/
VOID
minit(void)
{
/*
* Byte Order
*/
hilo = 0;
/*
* Address Space
*/
exprmasks(3);
}
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