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annotate lwasm/insn_rtor.c @ 533:543b5d1341d2

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Add note to manual about numeric entry addresses in scripts Link scripts require a numeric entry address to begin with a digit. Make a note about that in the manual since hex addresses starting with letters could be mistaken for symbols.
author William Astle <lost@l-w.ca>
date Sat, 14 May 2022 12:57:50 -0600
parents b20f14edda5a
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 /*
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2 insn_rtor.c
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3 Copyright © 2010 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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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 #include "lwasm.h"
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23 #include "instab.h"
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24
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25 PARSEFUNC(insn_parse_rtor)
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26 {
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27 int r0, r1;
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28
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29 static const char *regs = "D X Y U S PCW V A B CCDP0 0 E F ";
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30 static const char *regs9 = "D X Y U S PC A B CCDP ";
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31
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32 // register to register (r0,r1)
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33 // registers are in order:
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34 // D,X,Y,U,S,PC,W,V
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35 // A,B,CC,DP,0,0,E,F
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36
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37 r0 = lwasm_lookupreg2(!CURPRAGMA(l, PRAGMA_6809) ? regs : regs9, p);
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38 lwasm_skip_to_next_token(l, p);
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39 if (r0 < 0 || *(*p)++ != ',')
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40 {
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41 lwasm_register_error(as, l, E_OPERAND_BAD);
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42 r0 = r1 = 0;
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43 }
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44 else
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45 {
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46 lwasm_skip_to_next_token(l, p);
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47 r1 = lwasm_lookupreg2(!CURPRAGMA(l, PRAGMA_6809) ? regs : regs9, p);
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48 if (r1 < 0)
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49 {
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50 lwasm_register_error(as, l, E_OPERAND_BAD);
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51 r0 = r1 = 0;
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52 }
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53 }
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54 l -> pb = (r0 << 4) | r1;
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55 l -> len = OPLEN(instab[l -> insn].ops[0]) + 1;
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56 }
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57
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58 EMITFUNC(insn_emit_rtor)
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59 {
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60 lwasm_emitop(l, instab[l -> insn].ops[0]);
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61 lwasm_emit(l, l -> pb);
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62 }