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annotate lwasm/os9.c @ 581:10f8fc64481d

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Fix a slight error in cases where 0b is present but not followed by 0 or 1 This fixes an error where 0b is not followed by 0 or 1. In that case, the 0b prefix should not be consumed but the code which attempted to not consume it failed to actually update the parse pointer correctly.
author William Astle <lost@l-w.ca>
date Thu, 08 Aug 2024 13:40:00 -0600
parents dba08c7dff96
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
0
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1 /*
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2 os9.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 This file implements the various pseudo operations related to OS9 target
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22 */
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23 #include <errno.h>
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24 #include <stdio.h>
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25 #include <stdlib.h>
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26 #include <string.h>
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27
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28 #include <lw_expr.h>
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29
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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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33
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34 // OS9 syscall
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35 PARSEFUNC(pseudo_parse_os9)
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36 {
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37 lw_expr_t e;
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38
150
244f1227f2b5 Allow os9 directive in object target
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39 if (as -> output_format != OUTPUT_OS9 && as -> output_format != OUTPUT_OBJ)
0
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40 {
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41 lwasm_register_error2(as, l, E_DIRECTIVE_OS9_ONLY, "%s", "os9");
0
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42 return;
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43 }
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44
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45 // fetch immediate value
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46 e = lwasm_parse_expr(as, p);
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47 if (!e)
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48 {
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49 lwasm_register_error(as, l, E_OPERAND_BAD);
0
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50 return;
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51 }
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52 lwasm_save_expr(l, 0, e);
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53 l -> len = 3;
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54 }
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55
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56 EMITFUNC(pseudo_emit_os9)
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57 {
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58 lw_expr_t e;
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59
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60 e = lwasm_fetch_expr(l, 0);
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61
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62 lwasm_emitop(l, 0x103f);
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63 lwasm_emitexpr(l, e, 1);
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64 }
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65
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66 PARSEFUNC(pseudo_parse_mod)
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67 {
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68 lw_expr_t e;
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69 int i;
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70
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71 if (as -> output_format != OUTPUT_OS9)
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72 {
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73 lwasm_register_error2(as, l, E_DIRECTIVE_OS9_ONLY, "%s", "mod");
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74 skip_operand(p);
0
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75 return;
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76 }
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77
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78 if (as -> inmod)
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79 {
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80 lwasm_register_error(as, l, E_MODULE_IN);
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81 skip_operand(p);
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82 return;
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83 }
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84
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85 // parse 6 (or 4) expressions...
0
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86 for (i = 0; i < 5; i++)
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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, E_OPERAND_BAD);
0
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92 return;
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93 }
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94
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95 lwasm_save_expr(l, i, e);
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96
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97 if (**p != ',')
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98 {
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99 if (i == 3)
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100 {
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101 // we don't have the extra items; flag it and don't bother
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102 // with them later; goto is to short circuit the rest of
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103 // the expression parsing
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104 l -> lint = 4;
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105 goto doneexpr;
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106 }
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107 lwasm_register_error(as, l, E_OPERAND_BAD);
0
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108 return;
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109 }
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110 (*p)++;
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111 }
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112 e = lwasm_parse_expr(as, p);
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113 if (!e)
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114 {
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115 lwasm_register_error(as, l, E_OPERAND_BAD);
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116 return;
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117 }
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118 lwasm_save_expr(l, 5, e);
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119 l -> lint = 6;
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120
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121 doneexpr:
0
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122 l -> inmod = 1;
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123
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124 // we have an implicit ORG 0 with "mod"
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125 lw_expr_destroy(l -> addr);
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126 l -> addr = lw_expr_build(lw_expr_type_int, 0);
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127
142
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128 // likewise for data pointer
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129 lw_expr_destroy(l -> daddr);
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130 l -> daddr = lw_expr_build(lw_expr_type_int, 0);
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131
0
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132 // init crc
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133 as -> inmod = 1;
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134
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135 l -> len = (l -> lint == 6) ? 13 : 9;
0
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136 }
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137
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138 EMITFUNC(pseudo_emit_mod)
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139 {
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140 lw_expr_t e1, e2, e3, e4;
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141 int csum;
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142
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143 as -> crc[0] = 0xff;
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144 as -> crc[1] = 0xff;
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145 as -> crc[2] = 0xff;
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146
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147 // sync bytes
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148 lwasm_emit(l, 0x87);
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149 lwasm_emit(l, 0xcd);
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150
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151 // mod length
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152 lwasm_emitexpr(l, e1 = lwasm_fetch_expr(l, 0), 2);
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153
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154 // name offset
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155 lwasm_emitexpr(l, e2 = lwasm_fetch_expr(l, 1), 2);
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156
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157 // type
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158 lwasm_emitexpr(l, e3 = lwasm_fetch_expr(l, 2), 1);
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159
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160 // flags/rev
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161 lwasm_emitexpr(l, e4 = lwasm_fetch_expr(l, 3), 1);
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162
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163 // header check
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164 csum = ~(0x87 ^ 0xCD ^(lw_expr_intval(e1) >> 8) ^ (lw_expr_intval(e1) & 0xff)
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165 ^ (lw_expr_intval(e2) >> 8) ^ (lw_expr_intval(e2) & 0xff)
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166 ^ lw_expr_intval(e3) ^ lw_expr_intval(e4));
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167 lwasm_emit(l, csum);
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168
556
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169 if (l -> lint == 6)
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170 {
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171 // module type specific output, if provided
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172 // note that these are handled the same for all so
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173 // there need not be any special casing
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174
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175 // exec offset or fmgr name offset
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176 lwasm_emitexpr(l, lwasm_fetch_expr(l, 4), 2);
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177
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178 // data size or drvr name offset
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179 lwasm_emitexpr(l, lwasm_fetch_expr(l, 5), 2);
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180 }
0
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181 }
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182
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183 PARSEFUNC(pseudo_parse_emod)
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184 {
144
86d097dceebc Make os9 directives not throw spurious bad operand errors
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185 skip_operand(p);
0
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186 if (as -> output_format != OUTPUT_OS9)
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187 {
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188 lwasm_register_error2(as, l, E_DIRECTIVE_OS9_ONLY, "%s", "emod");
0
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189 return;
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190 }
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191
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192 if (!(as -> inmod))
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193 {
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194 lwasm_register_error(as, l, E_MODULE_NOTIN);
0
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195 return;
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196 }
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197
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198 as -> inmod = 0;
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199 l -> len = 3;
0
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200 }
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201
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202 EMITFUNC(pseudo_emit_emod)
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203 {
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204 unsigned char tcrc[3];
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205
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206 // don't mess with CRC!
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207 tcrc[0] = as -> crc[0] ^ 0xff;
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208 tcrc[1] = as -> crc[1] ^ 0xff;
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209 tcrc[2] = as -> crc[2] ^ 0xff;
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210 lwasm_emit(l, tcrc[0]);
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211 lwasm_emit(l, tcrc[1]);
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212 lwasm_emit(l, tcrc[2]);
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213 }