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annotate src/insn_rtor.c @ 159:71561c12b20b

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Updated docs to reflect new cescapes pragma and discuss implicit assumption of the bss section flag for sections named bss and .bss
author lost
date Sat, 31 Jan 2009 06:32:27 +0000
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1 /*
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2 insn_rtor.c
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3 Copyright © 2009 William Astle
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4
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5 This file is part of LWASM.
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6
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7 LWASM is free software: you can redistribute it and/or modify it under the
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8 terms of the GNU General Public License as published by the Free Software
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9 Foundation, either version 3 of the License, or (at your option) any later
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10 version.
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11
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12 This program is distributed in the hope that it will be useful, but WITHOUT
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13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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15 more details.
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16
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17 You should have received a copy of the GNU General Public License along with
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18 this program. If not, see <http://www.gnu.org/licenses/>.
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19 */
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20
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21 /*
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22 for handling register to register mode instructions
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23 */
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24
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25 #define __insn_rtor_c_seen__
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26
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27 #include "lwasm.h"
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28 #include "instab.h"
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29
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30 OPFUNC(insn_rtor)
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31 {
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32 int r0, r1;
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33 static const char *regs = "D X Y U S PCW V A B CCDP0 0 E F ";
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34
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35 lwasm_emitop(as, l, instab[opnum].ops[0]);
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36 // register to register (r0,r1)
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37 // registers are in order:
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38 // D,X,Y,U,S,PC,W,V
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39 // A,B,CC,DP,0,0,E,F
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40 r0 = lwasm_lookupreg2(regs, p);
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41 if (r0 < 0 || *(*p)++ != ',')
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42 {
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43 register_error(as, l, 1, "Bad operand");
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44 r0 = r1 = 0;
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45 }
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46 else
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47 {
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48 r1 = lwasm_lookupreg2(regs, p);
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49 if (r1 < 0)
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50 {
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51 register_error(as, l, 1, "Bad operand");
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52 r0 = r1 = 0;
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53 }
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54 }
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55 lwasm_emit(as, l, (r0 << 4) | r1);
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56 }