Mercurial > hg > index.cgi
annotate lwasm/insn_tfm.c @ 283:210d261a614d
Make byte overflow detection for indexing work better
There are *two* places where indexed addressing is calculated - lea style
instructions and general addressing instructions. Actually check for byte
overflows in both places. Also, extend byte overflow checking to all 8 bit
offsets from index registers, not just PCR.
author | William Astle <lost@l-w.ca> |
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date | Mon, 02 Sep 2013 10:49:57 -0600 |
parents | 09021ba6d755 |
children | 8764142b3192 |
rev | line source |
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0
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1 /* |
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2 insn_tfm.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 <ctype.h> |
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22 #include <string.h> |
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23 |
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24 #include "lwasm.h" |
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25 #include "instab.h" |
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26 |
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27 PARSEFUNC(insn_parse_tfm) |
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28 { |
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29 static const char *reglist = "DXYUS AB 00EF"; |
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30 int r0, r1; |
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31 char *c; |
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32 int tfm = 0; |
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33 |
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34 c = strchr(reglist, toupper(*(*p)++)); |
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35 if (!c) |
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36 { |
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37 lwasm_register_error(as, l, "Unknown operation"); |
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38 return; |
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39 } |
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40 r0 = c - reglist; |
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41 if (**p == '+') |
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42 { |
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43 (*p)++; |
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44 tfm = 1; |
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45 } |
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46 else if (**p == '-') |
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47 { |
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48 (*p)++; |
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49 tfm = 2; |
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50 } |
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51 if (*(*p)++ != ',') |
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52 { |
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53 lwasm_register_error(as, l, "Unknown operation"); |
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54 return; |
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55 } |
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56 c = strchr(reglist, toupper(*(*p)++)); |
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57 if (!c) |
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58 { |
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59 lwasm_register_error(as, l, "Unknown operation"); |
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60 return; |
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61 } |
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62 r1 = c - reglist; |
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63 |
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64 if (**p == '+') |
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65 { |
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66 (*p)++; |
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67 tfm |= 4; |
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68 } |
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69 else if (**p == '-') |
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70 { |
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71 (*p)++; |
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72 tfm |= 8; |
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73 } |
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74 |
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75 if (**p && !isspace(**p)) |
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76 { |
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77 lwasm_register_error(as, l, "Bad operand"); |
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78 return; |
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79 } |
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80 |
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81 // valid values of tfm here are: |
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82 // 1: r0+,r1 (2) |
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83 // 4: r0,r1+ (3) |
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84 // 5: r0+,r1+ (0) |
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85 // 10: r0-,r1- (1) |
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86 switch (tfm) |
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87 { |
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88 case 5: //r0+,r1+ |
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89 l -> lint = instab[l -> insn].ops[0]; |
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90 break; |
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91 |
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92 case 10: //r0-,r1- |
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93 l -> lint = instab[l -> insn].ops[1]; |
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94 break; |
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95 |
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96 case 1: // r0+,r1 |
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97 l -> lint = instab[l -> insn].ops[2]; |
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98 break; |
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99 |
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100 case 4: // r0,r1+ |
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101 l -> lint = instab[l -> insn].ops[3]; |
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102 break; |
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103 |
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104 default: |
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105 lwasm_register_error(as, l, "Unknown operation"); |
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106 return; |
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107 } |
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108 l -> pb = (r0 << 4) | r1; |
134 | 109 l -> len = OPLEN(l -> lint) + 1; |
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110 } |
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111 |
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112 EMITFUNC(insn_emit_tfm) |
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113 { |
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114 lwasm_emitop(l, l -> lint); |
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115 lwasm_emit(l, l -> pb); |
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116 } |
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117 |
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118 PARSEFUNC(insn_parse_tfmrtor) |
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119 { |
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120 int r0, r1; |
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121 static const char *regs = "D X Y U S A B 0 0 E F "; |
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122 |
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123 // register to register (r0,r1) |
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124 // registers are in order: |
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125 // D,X,Y,U,S,PC,W,V |
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126 // A,B,CC,DP,0,0,E,F |
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127 r0 = lwasm_lookupreg2(regs, p); |
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128 if (r0 < 0 || *(*p)++ != ',') |
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129 { |
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130 lwasm_register_error(as, l, "Bad operand"); |
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131 r0 = r1 = 0; |
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132 } |
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133 else |
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134 { |
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135 r1 = lwasm_lookupreg2(regs, p); |
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136 if (r1 < 0) |
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137 { |
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138 lwasm_register_error(as, l, "Bad operand"); |
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139 r0 = r1 = 0; |
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140 } |
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141 } |
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142 l -> len = instab[l -> insn].ops[0] + 1; |
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143 l -> pb = (r0 << 4) | r1; |
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144 } |
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145 |
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146 EMITFUNC(insn_emit_tfmrtor) |
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147 { |
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148 lwasm_emitop(l, instab[l -> insn].ops[0]); |
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149 lwasm_emit(l, l -> pb); |
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150 } |