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annotate lwasm/os9.c @ 105:3e9057059a43

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Even more command line parser fixing
author lost@l-w.ca
date Sat, 06 Aug 2011 23:20:10 -0600
parents 2c24602be78f
children 3fc568436721
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
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39 if (as -> output_format != OUTPUT_OS9)
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40 {
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41 lwasm_register_error(as, l, "os9 directive only valid for OS9 target");
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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, "Bad operand");
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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_error(as, l, "mod directive only valid for OS9 target");
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74 return;
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75 }
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76
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77 if (as -> inmod)
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78 {
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79 lwasm_register_error(as, l, "Already in a module!");
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80 return;
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81 }
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82
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83 // parse 6 expressions...
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84 for (i = 0; i < 5; i++)
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85 {
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86 e = lwasm_parse_expr(as, p);
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87 if (!e)
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88 {
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89 lwasm_register_error(as, l, "Bad operand");
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90 return;
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91 }
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92
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93 lwasm_save_expr(l, i, e);
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94
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95 if (**p != ',')
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96 {
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97 lwasm_register_error(as, l, "Bad operand");
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98 return;
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99 }
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100 (*p)++;
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101 }
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102
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103 e = lwasm_parse_expr(as, p);
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104 if (!e)
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105 {
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106 lwasm_register_error(as, l, "Bad operand");
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107 return;
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108 }
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109 lwasm_save_expr(l, 5, e);
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110
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111 l -> inmod = 1;
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112
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113 // we have an implicit ORG 0 with "mod"
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114 lw_expr_destroy(l -> addr);
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115 l -> addr = lw_expr_build(lw_expr_type_int, 0);
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116
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117 // init crc
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118 as -> inmod = 1;
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119 }
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120
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121 EMITFUNC(pseudo_emit_mod)
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122 {
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123 lw_expr_t e1, e2, e3, e4;
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124 int csum;
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125
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126 as -> crc[0] = 0xff;
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127 as -> crc[1] = 0xff;
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128 as -> crc[2] = 0xff;
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129
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130 // sync bytes
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131 lwasm_emit(l, 0x87);
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132 lwasm_emit(l, 0xcd);
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133
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134 // mod length
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135 lwasm_emitexpr(l, e1 = lwasm_fetch_expr(l, 0), 2);
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136
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137 // name offset
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138 lwasm_emitexpr(l, e2 = lwasm_fetch_expr(l, 1), 2);
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139
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140 // type
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141 lwasm_emitexpr(l, e3 = lwasm_fetch_expr(l, 2), 1);
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142
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143 // flags/rev
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144 lwasm_emitexpr(l, e4 = lwasm_fetch_expr(l, 3), 1);
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145
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146 // header check
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147 csum = ~(0x87 ^ 0xCD ^(lw_expr_intval(e1) >> 8) ^ (lw_expr_intval(e1) & 0xff)
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148 ^ (lw_expr_intval(e2) >> 8) ^ (lw_expr_intval(e2) & 0xff)
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149 ^ lw_expr_intval(e3) ^ lw_expr_intval(e4));
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150 lwasm_emit(l, csum);
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151
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152 // module type specific output
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153 // note that these are handled the same for all so
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154 // there need not be any special casing
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155
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156 // exec offset or fmgr name offset
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157 lwasm_emitexpr(l, lwasm_fetch_expr(l, 4), 2);
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158
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159 // data size or drvr name offset
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160 lwasm_emitexpr(l, lwasm_fetch_expr(l, 5), 2);
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161 }
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162
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163 PARSEFUNC(pseudo_parse_emod)
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164 {
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165 if (as -> output_format != OUTPUT_OS9)
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166 {
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167 lwasm_register_error(as, l, "emod directive only valid for OS9 target");
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168 return;
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169 }
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170
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171 if (!(as -> inmod))
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172 {
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173 lwasm_register_error(as, l, "not in a module!");
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174 return;
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175 }
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176
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177 as -> inmod = 0;
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178 }
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179
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180 EMITFUNC(pseudo_emit_emod)
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181 {
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182 unsigned char tcrc[3];
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183
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184 // don't mess with CRC!
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185 tcrc[0] = as -> crc[0] ^ 0xff;
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186 tcrc[1] = as -> crc[1] ^ 0xff;
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187 tcrc[2] = as -> crc[2] ^ 0xff;
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188 lwasm_emit(l, tcrc[0]);
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189 lwasm_emit(l, tcrc[1]);
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190 lwasm_emit(l, tcrc[2]);
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191 }