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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 <config.h>
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24 #include <errno.h>
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25 #include <stdio.h>
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26 #include <stdlib.h>
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27 #include <string.h>
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354
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28
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29 #include <lw_expr.h>
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30
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339
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31 #include "lwasm.h"
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32 #include "instab.h"
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354
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33
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339
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34
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354
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35 // OS9 syscall
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36 PARSEFUNC(pseudo_parse_os9)
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339
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37 {
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38 lw_expr_t e;
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339
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39
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354
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40 if (as -> output_format != OUTPUT_OS9)
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41 {
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42 lwasm_register_error(as, l, "os9 directive only valid for OS9 target");
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43 return;
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44 }
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45
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46 // fetch immediate value
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47 e = lwasm_parse_expr(as, p);
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48 if (!e)
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49 {
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50 lwasm_register_error(as, l, "Bad operand");
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51 return;
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52 }
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53 lwasm_save_expr(l, 0, e);
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54 l -> len = 3;
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339
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55 }
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56
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354
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57 EMITFUNC(pseudo_emit_os9)
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58 {
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59 lw_expr_t e;
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60
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61 e = lwasm_fetch_expr(l, 0);
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62
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63 lwasm_emitop(l, 0x103f);
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64 lwasm_emitexpr(l, e, 1);
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65 }
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66
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67 PARSEFUNC(pseudo_parse_mod)
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68 {
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69 lw_expr_t e;
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70 int i;
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71
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72 if (as -> output_format != OUTPUT_OS9)
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73 {
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74 lwasm_register_error(as, l, "mod directive only valid for OS9 target");
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339
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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, "Already in a module!");
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339
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81 return;
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82 }
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83
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84 // parse 6 expressions...
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85 for (i = 0; i < 5; i++)
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86 {
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354
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87 e = lwasm_parse_expr(as, p);
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88 if (!e)
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89 {
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90 lwasm_register_error(as, l, "Bad operand");
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91 return;
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339
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92 }
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93
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94 lwasm_save_expr(l, i, e);
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95
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339
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96 if (**p != ',')
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97 {
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98 lwasm_register_error(as, l, "Bad operand");
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99 return;
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100 }
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101 (*p)++;
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102 }
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103
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104 e = lwasm_parse_expr(as, p);
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105 if (!e)
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106 {
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107 lwasm_register_error(as, l, "Bad operand");
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108 return;
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109 }
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110 lwasm_save_expr(l, 5, e);
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111
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112 l -> inmod = 1;
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113
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114 // we have an implicit ORG 0 with "mod"
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115 lw_expr_destroy(l -> addr);
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116 l -> addr = lw_expr_build(lw_expr_type_int, 0);
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117
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118 // init crc
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119 as -> inmod = 1;
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120 }
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121
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122 EMITFUNC(pseudo_emit_mod)
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123 {
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124 lw_expr_t e1, e2, e3, e4;
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125 int csum;
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126
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127 as -> crc[0] = 0xff;
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128 as -> crc[1] = 0xff;
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129 as -> crc[2] = 0xff;
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130
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131 // sync bytes
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354
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132 lwasm_emit(l, 0x87);
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133 lwasm_emit(l, 0xcd);
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134
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135 // mod length
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354
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136 lwasm_emitexpr(l, e1 = lwasm_fetch_expr(l, 0), 2);
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137
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138 // name offset
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354
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139 lwasm_emitexpr(l, e2 = lwasm_fetch_expr(l, 1), 2);
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140
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141 // type
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142 lwasm_emitexpr(l, e3 = lwasm_fetch_expr(l, 2), 1);
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143
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144 // flags/rev
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354
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145 lwasm_emitexpr(l, e4 = lwasm_fetch_expr(l, 3), 1);
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146
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147 // header check
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148 csum = ~(0x87 ^ 0xCD ^(lw_expr_intval(e1) >> 8) ^ (lw_expr_intval(e1) & 0xff)
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149 ^ (lw_expr_intval(e2) >> 8) ^ (lw_expr_intval(e2) & 0xff)
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150 ^ lw_expr_intval(e3) ^ lw_expr_intval(e4));
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151 lwasm_emit(l, csum);
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339
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152
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153 // module type specific output
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154 // note that these are handled the same for all so
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155 // there need not be any special casing
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156
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157 // exec offset or fmgr name offset
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158 lwasm_emitexpr(l, lwasm_fetch_expr(l, 4), 2);
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159
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160 // data size or drvr name offset
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354
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161 lwasm_emitexpr(l, lwasm_fetch_expr(l, 5), 2);
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339
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162 }
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163
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354
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164 PARSEFUNC(pseudo_parse_emod)
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165 {
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166 if (as -> output_format != OUTPUT_OS9)
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167 {
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168 lwasm_register_error(as, l, "emod directive only valid for OS9 target");
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169 return;
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170 }
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171
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172 if (!(as -> inmod))
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173 {
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174 lwasm_register_error(as, l, "not in a module!");
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175 return;
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176 }
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177
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178 as -> inmod = 0;
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179 }
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180
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181 EMITFUNC(pseudo_emit_emod)
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182 {
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183 unsigned char tcrc[3];
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184
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185 // don't mess with CRC!
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186 tcrc[0] = as -> crc[0] ^ 0xff;
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187 tcrc[1] = as -> crc[1] ^ 0xff;
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188 tcrc[2] = as -> crc[2] ^ 0xff;
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354
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189 lwasm_emit(l, tcrc[0]);
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190 lwasm_emit(l, tcrc[1]);
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191 lwasm_emit(l, tcrc[2]);
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339
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192 }
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