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annotate lwasm/os9.c @ 556:928c033c0cd0

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Allow MOD directive to accept only the standard base header parameters There are cases where only the standard OS9 module header fields are to be provided. This could be, for instance, in the case of a nonstandard user type module. So allow the execution offset and data size fields to be omitted entirely and handle the module length correctly as well.
author William Astle <lost@l-w.ca>
date Fri, 08 Sep 2023 00:32:40 -0600
parents 8764142b3192
children dba08c7dff96
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");
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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);
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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);
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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...
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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);
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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);
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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
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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 = (i == 6) ? 13 : 9;
0
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136 }
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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 {
370
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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;
112
3fc568436721 Correct size handling for mod and emod
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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 }