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annotate lwasm/insn_rlist.c @ 377:67373a053c49

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Add ?rts target for branch instructions Add a ?rts target for branch instructions, which brances to the nearest RTS or inverts the branch logic to branch around a generated RTS. Activated by a pragma "qrts". Thanks to Erik G <erik@6809.org> for the patch.
author William Astle <lost@l-w.ca>
date Mon, 13 Jul 2015 20:50:02 -0600
parents 35d4213e6657
children b20f14edda5a
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1 /*
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2 insn_rlist.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 inherent mode instructions
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23 */
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24
2
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25 #include <ctype.h>
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26
0
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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 PARSEFUNC(insn_parse_rlist)
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31 {
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32 int rb = 0;
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33 int rn;
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34 static const char *regs = "CCA B DPX Y U PCD S ";
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35
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36 while (**p && !isspace(**p))
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37 {
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38 rn = lwasm_lookupreg2(regs, p);
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39 if (rn < 0)
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40 {
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41 lwasm_register_error2(as, l, E_REGISTER_BAD, "'%s'", *p);
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42 return;
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43 }
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44 if (**p && **p != ',' && !isspace(**p))
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45 {
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46 lwasm_register_error(as, l, E_OPERAND_BAD);
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47 }
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48 if (**p == ',')
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49 (*p)++;
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50 if ((instab[l -> insn].ops[0]) & 2)
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51 {
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52 // pshu/pulu
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53 if (rn == 6)
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54 {
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55 lwasm_register_error2(as, l, E_REGISTER_BAD, "'%s'", "u");
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56 return;
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57 }
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58 }
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59 else
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60 {
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61 if (rn == 9)
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62 {
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63 lwasm_register_error2(as, l, E_REGISTER_BAD, "'%s'", "s");
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64 return;
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65 }
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66 }
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67 if (rn == 8)
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68 rn = 6;
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69 else if (rn == 9)
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70 rn = 0x40;
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71 else
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72 rn = 1 << rn;
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73 rb |= rn;
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74 }
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75 if (rb == 0)
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76 lwasm_register_error(as, l, E_OPERAND_BAD);
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77 l -> len = OPLEN(instab[l -> insn].ops[0]) + 1;
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78 l -> pb = rb;
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79 }
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80
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81 EMITFUNC(insn_emit_rlist)
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82 {
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83 lwasm_emitop(l, instab[l -> insn].ops[0]);
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84 lwasm_emit(l, l -> pb);
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85
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86 l -> cycle_adj = lwasm_cycle_calc_rlist(l);
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87 }