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annotate lwasm/insn_rel.c @ 122:2be2649841f8

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Fixed embarrassing off by one in insn_rel length calculation
author lost@l-w.ca
date Wed, 10 Aug 2011 19:05:49 -0600
parents 7b0716264251
children 6f2e18f1fe67
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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 <ctype.h>
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26 #include <stdlib.h>
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27 #include <stdio.h>
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28
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29 #include <lw_expr.h>
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30
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31 #include "lwasm.h"
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32 #include "instab.h"
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33
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34 /*
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35 For generic relative, the first "opcode" is the natural opcode for the
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36 mneumonic. The second "opcode" is the natural size of the relative offset.
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37 These will be used when pragma autobranchlength is NOT in effect.
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38
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39 The third "opcode" is the short (8 bit) version of the branch. The final one
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40 is the long (16 bit) version of the branch. These will be used when pragma
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41 autobranchlength is in effect.
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42
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43 When autobranchlength is in effect, the branch target can be prefixed with
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44 either < or > to force a short or long branch. Note that in this mode,
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45 a > or < on its own still specifies a branch point.
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46
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47 */
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48 PARSEFUNC(insn_parse_relgen)
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49 {
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50 lw_expr_t t, e1, e2;
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51
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52 l -> lint = -1;
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53 if (CURPRAGMA(l, PRAGMA_AUTOBRANCHLENGTH) == 0)
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54 {
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55 l -> lint = instab[l -> insn].ops[1];
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56 }
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57 else
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58 {
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59 if (**p == '>' && (((*p)[1]) && !isspace((*p)[1])))
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60 {
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61 (*p)++;
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62 l -> lint = 16;
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63 }
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64 else if (**p == '<' && (((*p)[1]) && !isspace((*p)[1])))
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65 {
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66 (*p)++;
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67 l -> lint = 8;
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68 }
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69 }
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70
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71 /* forced sizes handled */
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72
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73 // sometimes there is a "#", ignore if there
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74 if (**p == '#')
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75 (*p)++;
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76
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77 t = lwasm_parse_expr(as, p);
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78
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79 if (!t)
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80 {
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81 lwasm_register_error(as, l, "Bad operand");
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82 return;
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83 }
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84
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85 // if we know the length of the instruction, set it now
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86 if (l -> lint == 8)
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87 {
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88 l -> len = OPLEN(instab[l -> insn].ops[2]) + 1;
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89 }
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90 else if (l -> lint == 16)
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91 {
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92 l -> len = OPLEN(instab[l -> insn].ops[3]) + 2;
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93 }
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94
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95 // the offset calculation here depends on the length of this line!
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96 // how to calculate requirements?
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97 // this is the same problem faced by ,pcr indexing
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98 e2 = lw_expr_build(lw_expr_type_special, lwasm_expr_linelen, l);
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99 e1 = lw_expr_build(lw_expr_type_oper, lw_expr_oper_minus, t, e2);
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100 lw_expr_destroy(e2);
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101 e2 = lw_expr_build(lw_expr_type_oper, lw_expr_oper_minus, e1, l -> addr);
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102 lw_expr_destroy(e1);
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103 lwasm_save_expr(l, 0, e2);
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104 lw_expr_destroy(t);
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105
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106 if (l -> len == -1)
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107 {
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108 e1 = lw_expr_copy(e2);
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109 l -> len = OPLEN(instab[l -> insn].ops[2]) + 1;
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110 lwasm_reduce_expr(as, e1);
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111 l -> len = -1;
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112 if (lw_expr_istype(e1, lw_expr_type_int))
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113 {
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114 int v;
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115 v = lw_expr_intval(e1);
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116 if (v >= -128 && v <= 127)
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117 {
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118 l -> lint = 8;
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119 l -> len = OPLEN(instab[l -> insn].ops[2]) + 1;
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120 }
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121 else
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122 {
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123 l -> lint = 16;
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124 l -> len = OPLEN(instab[l -> insn].ops[3]) + 2;
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125 }
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126 }
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127 lw_expr_destroy(e1);
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128 }
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129 }
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130
116
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131 RESOLVEFUNC(insn_resolve_relgen)
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132 {
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133 lw_expr_t e, e2;
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134 int offs;
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135
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136 if (l -> lint == -1)
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137 {
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138 e = lwasm_fetch_expr(l, 0);
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139 if (!lw_expr_istype(e, lw_expr_type_int))
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140 {
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141 // temporarily set the instruction length to see if we get a
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142 // constant for our expression; if so, we can select an instruction
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143 // size
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144 e2 = lw_expr_copy(e);
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145 // size of 8-bit opcode + 8 bit offset
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146 l -> len = OPLEN(instab[l -> insn].ops[2]) + 1;
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147 lwasm_reduce_expr(as, e2);
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148 l -> len = -1;
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149 if (lw_expr_istype(e2, lw_expr_type_int))
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150 {
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151 // it reduced to an integer; is it in 8 bit range?
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152 offs = lw_expr_intval(e2);
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153 if (offs >= -128 && offs <= 127)
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154 {
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155 // fits in 8 bits
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156 l -> len = OPLEN(instab[l -> insn].ops[2]) + 1;
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157 l -> lint = 8;
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158 }
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159 else
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160 {
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161 // requires 16 bits
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162 l -> len = OPLEN(instab[l -> insn].ops[3]) + 2;
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163 l -> lint = 16;
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164 }
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165 }
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166 lw_expr_destroy(e2);
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167 }
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168 if (lw_expr_istype(e, lw_expr_type_int))
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169 {
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170 // it reduced to an integer; is it in 8 bit range?
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171 offs = lw_expr_intval(e);
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172 if (offs >= -128 && offs <= 127)
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173 {
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174 // fits in 8 bits
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175 l -> len = OPLEN(instab[l -> insn].ops[2]) + 1;
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176 l -> lint = 8;
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177 }
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178 else
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179 {
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180 // requires 16 bits
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181 l -> len = OPLEN(instab[l -> insn].ops[3]) + 2;
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182 l -> lint = 16;
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183 }
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184 }
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185 }
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186 if (!force)
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187 return;
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188
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189 if (l -> len == -1)
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190 {
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191 l -> len = OPLEN(instab[l -> insn].ops[3]) + 2;
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192 l -> lint = 16;
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193 }
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194 }
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195
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196 EMITFUNC(insn_emit_relgen)
0
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197 {
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198 lw_expr_t e;
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199 int offs;
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200
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201 e = lwasm_fetch_expr(l, 0);
116
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202 if (l -> lint == 8)
0
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203 {
116
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204 if (!lw_expr_istype(e, lw_expr_type_int))
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205 {
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206 lwasm_register_error(as, l, "Illegal non-constant expression");
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207 return;
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208 }
0
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209
116
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210 offs = lw_expr_intval(e);
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211 if (l -> lint == 8 && (offs < -128 || offs > 127))
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212 {
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213 lwasm_register_error(as, l, "Byte overflow");
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214 return;
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215 }
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216
0
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217
116
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218 lwasm_emitop(l, instab[l -> insn].ops[2]);
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219 lwasm_emit(l, offs);
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220 }
116
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221 else
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222 {
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223 lwasm_emitop(l, instab[l -> insn].ops[3]);
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224 lwasm_emitexpr(l, e, 2);
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225 }
0
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226 }