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annotate lwasm/insn_bitbit.c @ 0:2c24602be78f
Initial import from lwtools 3.0.1 version, with new hand built build system and file reorganization
author | lost@l-w.ca |
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date | Wed, 19 Jan 2011 22:27:17 -0700 |
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children | 7317fbe024af |
rev | line source |
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0
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Initial import from lwtools 3.0.1 version, with new hand built build system and file reorganization
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1 /* |
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2 insn_bitbit.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 #include <stdlib.h> |
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22 |
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23 #include <lw_expr.h> |
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24 |
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25 #include "lwasm.h" |
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26 #include "instab.h" |
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27 |
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28 // these instructions cannot tolerate external references |
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29 PARSEFUNC(insn_parse_bitbit) |
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30 { |
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31 int r; |
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32 lw_expr_t e; |
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33 int v1; |
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34 int tv; |
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35 |
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36 r = toupper(*(*p)++); |
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37 if (r == 'A') |
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38 r = 1; |
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39 else if (r == 'B') |
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40 r = 2; |
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41 else if (r == 'C' && toupper(**p) == 'C') |
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42 { |
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43 r = 0; |
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44 (*p)++; |
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45 } |
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46 else |
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47 { |
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48 lwasm_register_error(as, l, "Bad register"); |
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49 return; |
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50 } |
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51 |
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52 if (*(*p)++ != ',') |
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53 { |
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54 lwasm_register_error(as, l, "Bad operand"); |
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55 return; |
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56 } |
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57 e = lwasm_parse_expr(as, p); |
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58 if (!e) |
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59 { |
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60 lwasm_register_error(as, l, "Bad operand"); |
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61 return; |
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62 } |
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63 lwasm_save_expr(l, 0, e); |
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64 if (*(*p)++ != ',') |
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65 { |
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66 lwasm_register_error(as, l, "Bad operand"); |
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67 return; |
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68 } |
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69 |
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70 e = lwasm_parse_expr(as, p); |
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71 if (!e) |
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72 { |
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73 lwasm_register_error(as, l, "Bad operand"); |
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74 return; |
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75 } |
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76 lwasm_save_expr(l, 1, e); |
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77 |
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78 if (*(*p)++ != ',') |
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79 { |
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80 lwasm_register_error(as, l, "Bad operand"); |
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81 return; |
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82 } |
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83 |
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84 // ignore base page address modifier |
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85 if (**p == '<') |
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86 (*p)++; |
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87 |
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88 e = lwasm_parse_expr(as, p); |
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89 if (!e) |
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90 { |
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91 lwasm_register_error(as, l, "Bad operand"); |
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92 return; |
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93 } |
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94 lwasm_save_expr(l, 2, e); |
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95 |
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96 l -> lint = r; |
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97 l -> len = OPLEN(instab[l -> insn].ops[0]) + 2; |
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98 } |
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99 |
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100 EMITFUNC(insn_emit_bitbit) |
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101 { |
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102 int v1, v2; |
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103 lw_expr_t e; |
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104 |
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105 e = lwasm_fetch_expr(l, 0); |
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106 if (!lw_expr_istype(e, lw_expr_type_int)) |
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107 { |
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108 lwasm_register_error(as, l, "Bit number must be fully resolved"); |
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109 return; |
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110 } |
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111 v1 = lw_expr_intval(e); |
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112 if (v1 < 0 || v1 > 7) |
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113 { |
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114 lwasm_register_error(as, l, "Invalid bit number"); |
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115 v1 = 0; |
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116 } |
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117 |
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118 e = lwasm_fetch_expr(l, 1); |
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119 if (!lw_expr_istype(e, lw_expr_type_int)) |
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120 { |
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121 lwasm_register_error(as, l, "Bit number must be fully resolved"); |
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122 return; |
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123 } |
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124 v2 = lw_expr_intval(e); |
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125 if (v2 < 0 || v2 > 7) |
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126 { |
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127 lwasm_register_error(as, l, "Invalid bit number"); |
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128 v2 = 0; |
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129 } |
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130 l -> pb = (l -> lint << 6) | (v1 << 3) | v2; |
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131 |
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132 e = lwasm_fetch_expr(l, 2); |
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133 if (lw_expr_istype(e, lw_expr_type_int)) |
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134 { |
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135 v1 = lw_expr_intval(e) & 0xFFFF; |
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136 v2 = v1 - ((l -> dpval) << 8); |
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137 if (v2 > 0xFF || v2 < 0) |
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138 { |
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139 lwasm_register_error(as, l, "Byte overflow"); |
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140 return; |
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141 } |
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142 } |
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143 lwasm_emitop(l, instab[l -> insn].ops[0]); |
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144 lwasm_emit(l, l -> pb); |
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145 lwasm_emitexpr(l, e, 1); |
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146 } |