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339
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1 /*
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2 insn_rel.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 relative mode instructions
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23 */
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24
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25 #include <config.h>
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26 #include <stdlib.h>
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27
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357
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28 #include <lw_expr.h>
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29
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339
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30 #include "lwasm.h"
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31 #include "instab.h"
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32
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357
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33 PARSEFUNC(insn_parse_rel8)
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339
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34 {
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35 int v;
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357
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36 lw_expr_t t, e1, e2;
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339
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37 int r;
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38
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357
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39 // sometimes there is a "#", ignore if there
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339
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40 if (**p == '#')
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41 (*p)++;
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42
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357
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43 t = lwasm_parse_expr(as, p);
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44 if (!t)
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339
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45 {
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357
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46 lwasm_register_error(as, l, "Bad operand");
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47 return;
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339
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48 }
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357
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49 l -> len = OPLEN(instab[l -> insn].ops[0]) + 1;
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50
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51 e1 = lw_expr_build(lw_expr_type_special, lwasm_expr_linelen, l);
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52 e2 = lw_expr_build(lw_expr_type_oper, lw_expr_oper_plus, e1, l -> addr);
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53 lw_expr_destroy(e1);
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54 e1 = lw_expr_build(lw_expr_type_oper, lw_expr_oper_minus, t, e2);
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55 lw_expr_destroy(e2);
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56 lwasm_save_expr(l, 0, e2);
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339
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57 }
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58
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357
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59 EMITFUNC(insn_emit_rel8)
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60 {
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61 lw_expr_t e;
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62 int offs;
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63
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64 e = lwasm_fetch_expr(l, 0);
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65 if (!lw_expr_istype(e, lw_expr_type_int))
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66 {
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67 lwasm_register_error(as, l, "Illegal non-constant expression");
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68 return;
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69 }
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70
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71 offs = lw_expr_intval(e);
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72 if (offs < -128 || offs > 127)
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73 {
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74 lwasm_register_error(as, l, "Byte overflow");
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75 return;
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76 }
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77
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78 lwasm_emitop(l, instab[l -> insn].ops[0]);
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79 lwasm_emit(l, offs);
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80 }
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81
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82 PARSEFUNC(insn_parse_rel16)
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339
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83 {
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84 int v;
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357
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85 lw_expr_t t, e1, e2;
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339
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86 int r;
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357
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87
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88 // sometimes there is a "#", ignore if there
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339
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89 if (**p == '#')
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90 (*p)++;
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91
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357
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92 t = lwasm_parse_expr(as, p);
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93 if (!t)
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339
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94 {
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357
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95 lwasm_register_error(as, l, "Bad operand");
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96 return;
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339
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97 }
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357
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98 l -> len = OPLEN(instab[l -> insn].ops[0]) + 2;
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99
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100 e1 = lw_expr_build(lw_expr_type_special, lwasm_expr_linelen, l);
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101 e2 = lw_expr_build(lw_expr_type_oper, lw_expr_oper_plus, e1, l -> addr);
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102 lw_expr_destroy(e1);
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103 e1 = lw_expr_build(lw_expr_type_oper, lw_expr_oper_minus, t, e2);
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104 lw_expr_destroy(e2);
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105 lwasm_save_expr(l, 0, e2);
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106 }
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339
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107
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357
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108 EMITFUNC(insn_emit_rel16)
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109 {
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110 lw_expr_t e;
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111 int offs;
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112
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113 e = lwasm_fetch_expr(l, 0);
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114
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115 lwasm_emitop(l, instab[l -> insn].ops[0]);
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116 lwasm_emitexpr(l, e, 2);
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339
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117 }
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