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annotate lwasm/insn_rel.c @ 273:1409debcb1a0

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Fix crash on listing when nested noexpand macros are used Macros flagged noexpand were causing a segfault during listing. The problem was incorrect accounting for nesting levels for noexpand macros causing the listing handler to fall off the end of the program in certain circumstances and in other circumstances it would fail to suppress expansion. Both the segfault in the case of misbehaviour and the misbhaviour itself are corrected with this update. If you do not use nested noexpand macros, this bug has no effect.
author William Astle <lost@l-w.ca>
date Sat, 25 May 2013 13:35:46 -0600
parents d0e9dbe9afbe
children 8764142b3192
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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 l -> maxlen = OPLEN(instab[l -> insn].ops[3]) + 2;
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54 l -> minlen = OPLEN(instab[l -> insn].ops[2]) + 1;
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55 if (CURPRAGMA(l, PRAGMA_AUTOBRANCHLENGTH) == 0)
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56 {
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57 l -> lint = instab[l -> insn].ops[1];
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58 }
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59 else
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60 {
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61 if (**p == '>' && (((*p)[1]) && !isspace((*p)[1])))
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62 {
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63 (*p)++;
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64 l -> lint = 16;
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65 }
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66 else if (**p == '<' && (((*p)[1]) && !isspace((*p)[1])))
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67 {
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68 (*p)++;
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69 l -> lint = 8;
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70 }
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71 }
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72
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73 /* forced sizes handled */
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74
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75 // sometimes there is a "#", ignore if there
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76 if (**p == '#')
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77 (*p)++;
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78
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79 t = lwasm_parse_expr(as, p);
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80
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81 if (!t)
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82 {
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83 lwasm_register_error(as, l, "Bad operand");
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84 return;
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85 }
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86
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87 // if we know the length of the instruction, set it now
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88 if (l -> lint == 8)
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89 {
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90 l -> len = OPLEN(instab[l -> insn].ops[2]) + 1;
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91 }
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92 else if (l -> lint == 16)
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93 {
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94 l -> len = OPLEN(instab[l -> insn].ops[3]) + 2;
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95 }
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96
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97 // the offset calculation here depends on the length of this line!
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98 // how to calculate requirements?
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99 // this is the same problem faced by ,pcr indexing
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100 e2 = lw_expr_build(lw_expr_type_special, lwasm_expr_linelen, l);
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101 e1 = lw_expr_build(lw_expr_type_oper, lw_expr_oper_minus, t, e2);
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102 lw_expr_destroy(e2);
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103 e2 = lw_expr_build(lw_expr_type_oper, lw_expr_oper_minus, e1, l -> addr);
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104 lw_expr_destroy(e1);
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105 lwasm_save_expr(l, 0, e2);
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106 lw_expr_destroy(t);
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107
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108 if (l -> len == -1)
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109 {
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110 e1 = lw_expr_copy(e2);
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111 l -> len = OPLEN(instab[l -> insn].ops[2]) + 1;
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112 lwasm_reduce_expr(as, e1);
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113 l -> len = -1;
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114 if (lw_expr_istype(e1, lw_expr_type_int))
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115 {
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116 int v;
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117 v = lw_expr_intval(e1);
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118 if (v >= -128 && v <= 127)
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119 {
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120 l -> lint = 8;
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121 l -> len = OPLEN(instab[l -> insn].ops[2]) + 1;
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122 }
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123 else
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124 {
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125 l -> lint = 16;
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126 l -> len = OPLEN(instab[l -> insn].ops[3]) + 2;
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127 }
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128 }
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129 lw_expr_destroy(e1);
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130 }
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131 }
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132
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133 RESOLVEFUNC(insn_resolve_relgen)
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134 {
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135 lw_expr_t e, e2;
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136 int offs;
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137
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138 if (l -> lint == -1)
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139 {
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140 e = lwasm_fetch_expr(l, 0);
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141 if (!lw_expr_istype(e, lw_expr_type_int))
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142 {
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143 // temporarily set the instruction length to see if we get a
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144 // constant for our expression; if so, we can select an instruction
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145 // size
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146 e2 = lw_expr_copy(e);
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147 // size of 8-bit opcode + 8 bit offset
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148 l -> len = OPLEN(instab[l -> insn].ops[2]) + 1;
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149 lwasm_reduce_expr(as, e2);
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150 l -> len = -1;
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151 if (lw_expr_istype(e2, lw_expr_type_int))
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152 {
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153 // it reduced to an integer; is it in 8 bit range?
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154 offs = lw_expr_intval(e2);
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155 if (offs >= -128 && offs <= 127)
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156 {
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157 // fits in 8 bits
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158 l -> len = OPLEN(instab[l -> insn].ops[2]) + 1;
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159 l -> lint = 8;
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160 }
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161 else
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162 {
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163 // requires 16 bits
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164 l -> len = OPLEN(instab[l -> insn].ops[3]) + 2;
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165 l -> lint = 16;
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166 }
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167 }
211
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168 // size of 8-bit opcode + 8 bit offset
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169 l -> len = OPLEN(instab[l -> insn].ops[2]) + 1;
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170 as -> pretendmax = 1;
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171 lwasm_reduce_expr(as, e2);
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172 as -> pretendmax = 0;
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173 l -> len = -1;
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174 if (lw_expr_istype(e2, lw_expr_type_int))
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175 {
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176 // it reduced to an integer; is it in 8 bit range?
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177 offs = lw_expr_intval(e2);
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178 if (offs >= -128 && offs <= 127)
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179 {
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180 // fits in 8 bits with a worst case scenario
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181 l -> len = OPLEN(instab[l -> insn].ops[2]) + 1;
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182 l -> lint = 8;
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183 }
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184 }
116
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185 lw_expr_destroy(e2);
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186 }
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187 if (lw_expr_istype(e, lw_expr_type_int))
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188 {
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189 // it reduced to an integer; is it in 8 bit range?
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190 offs = lw_expr_intval(e);
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191 if (offs >= -128 && offs <= 127)
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192 {
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193 // fits in 8 bits
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194 l -> len = OPLEN(instab[l -> insn].ops[2]) + 1;
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195 l -> lint = 8;
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196 }
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197 else
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198 {
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199 // requires 16 bits
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200 l -> len = OPLEN(instab[l -> insn].ops[3]) + 2;
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201 l -> lint = 16;
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202 }
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203 }
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204 }
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205 if (!force)
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206 return;
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207
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208 if (l -> len == -1)
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209 {
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210 l -> len = OPLEN(instab[l -> insn].ops[3]) + 2;
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211 l -> lint = 16;
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212 }
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213 }
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214
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diff changeset
215 EMITFUNC(insn_emit_relgen)
0
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216 {
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217 lw_expr_t e;
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218 int offs;
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219
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220 e = lwasm_fetch_expr(l, 0);
116
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221 if (l -> lint == 8)
0
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parents:
diff changeset
222 {
116
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223 if (!lw_expr_istype(e, lw_expr_type_int))
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224 {
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225 lwasm_register_error(as, l, "Illegal non-constant expression");
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226 return;
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227 }
0
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diff changeset
228
116
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229 offs = lw_expr_intval(e);
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230 if (l -> lint == 8 && (offs < -128 || offs > 127))
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diff changeset
231 {
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232 lwasm_register_error(as, l, "Byte overflow");
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233 return;
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234 }
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diff changeset
235
0
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236
116
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diff changeset
237 lwasm_emitop(l, instab[l -> insn].ops[2]);
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diff changeset
238 lwasm_emit(l, offs);
0
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diff changeset
239 }
116
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diff changeset
240 else
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diff changeset
241 {
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diff changeset
242 lwasm_emitop(l, instab[l -> insn].ops[3]);
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diff changeset
243 lwasm_emitexpr(l, e, 2);
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diff changeset
244 }
0
2c24602be78f Initial import from lwtools 3.0.1 version, with new hand built build system and file reorganization
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diff changeset
245 }