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annotate lwasm/output.c @ 232:1009f302ac11

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Documented the "Flags" term for object files
author lost
date Fri, 12 Jun 2009 04:17:22 +0000
parents bae1e3ecdce1
children a58f49a77441
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1 /*
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2 output.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 Contains the code for actually outputting the assembled code
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22 */
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23 #include <config.h>
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24 //#include <ctype.h>
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25 #include <errno.h>
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26 #include <stdio.h>
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27 //#include <stdlib.h>
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28 #include <string.h>
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29 #include <unistd.h>
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30 #define __output_c_seen__
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31 //#include "instab.h"
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32 #include "lwasm.h"
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33 #include "util.h"
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34
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35 void write_code_raw(asmstate_t *as, FILE *of);
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36 void write_code_decb(asmstate_t *as, FILE *of);
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37 void write_code_rawrel(asmstate_t *as, FILE *of);
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38 void write_code_obj(asmstate_t *as, FILE *of);
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39
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40 // this prevents warnings about not using the return value of fwrite()
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41 #define writebytes(s, l, c, f) do { int r; r = fwrite((s), (l), (c), (f)); } while (0)
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42
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43 void lwasm_output(asmstate_t *as)
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44 {
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45 FILE *of;
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46
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47 if (as -> errorcount > 0)
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48 {
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49 fprintf(stderr, "Not doing output due to assembly errors.\n");
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50 return;
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51 }
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52
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53 of = fopen(as -> outfile, "wb");
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54 if (!of)
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55 {
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56 fprintf(stderr, "Cannot open '%s' for output", as -> outfile);
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57 perror("");
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58 return;
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59 }
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60
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61 switch (as -> outformat)
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62 {
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63 case OUTPUT_RAW:
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64 write_code_raw(as, of);
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65 break;
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66
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67 case OUTPUT_DECB:
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68 write_code_decb(as, of);
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69 break;
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70
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71 case OUTPUT_RAWREL:
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72 write_code_rawrel(as, of);
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73 break;
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74
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75 case OUTPUT_OBJ:
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76 write_code_obj(as, of);
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77 break;
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78
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79 default:
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80 fprintf(stderr, "BUG: unrecognized output format when generating output file\n");
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81 fclose(of);
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82 unlink(as -> outfile);
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83 return;
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84 }
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85
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86 fclose(of);
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87 }
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88
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89 /*
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90 rawrel output treats an ORG directive as an offset from the start of the
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91 file. Undefined results will occur if an ORG directive moves the output
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92 pointer backward. This particular implementation uses "fseek" to handle
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93 ORG requests and to skip over RMBs.
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94
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95 This simple brain damanged method simply does an fseek before outputting
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96 each instruction.
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97 */
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98 void write_code_rawrel(asmstate_t *as, FILE *of)
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99 {
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100 lwasm_line_t *cl;
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101
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102 for (cl = as -> lineshead; cl; cl = cl -> next)
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103 {
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104 if (cl -> codelen == 0)
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105 continue;
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106
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107 fseek(of, cl -> codeaddr, SEEK_SET);
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108 writebytes(cl -> bytes, cl -> codelen, 1, of);
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109 }
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110 }
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111
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112 /*
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113 raw merely writes all the bytes directly to the file as is. ORG is just a
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114 reference for the assembler to handle absolute references. Multiple ORG
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115 statements will produce mostly useless results
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116 */
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117 void write_code_raw(asmstate_t *as, FILE *of)
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118 {
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119 lwasm_line_t *cl;
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120
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121 for (cl = as -> lineshead; cl; cl = cl -> next)
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122 {
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123 if (cl -> nocodelen)
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124 {
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125 int i;
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126 for (i = 0; i < cl -> nocodelen; i++)
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127 writebytes("\0", 1, 1, of);
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128 continue;
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129 }
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130 writebytes(cl -> bytes, cl -> codelen, 1, of);
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131 }
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132 }
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133
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134 void write_code_decb(asmstate_t *as, FILE *of)
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135 {
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136 long preambloc;
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137 lwasm_line_t *cl;
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138 int blocklen = -1;
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139 int nextcalc = -1;
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140 unsigned char outbuf[5];
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141
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142 for (cl = as -> lineshead; cl; cl = cl -> next)
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143 {
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144 if (cl -> nocodelen)
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145 continue;
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146 if (cl -> codeaddr != nextcalc && cl -> codelen > 0)
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147 {
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148 // need preamble here
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149 if (blocklen > 0)
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150 {
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151 // update previous preamble if needed
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152 fseek(of, preambloc, SEEK_SET);
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153 outbuf[0] = (blocklen >> 8) & 0xFF;
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154 outbuf[1] = blocklen & 0xFF;
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155 writebytes(outbuf, 2, 1, of);
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156 fseek(of, 0, SEEK_END);
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157 }
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158 blocklen = 0;
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159 nextcalc = cl -> codeaddr;
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160 outbuf[0] = 0x00;
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161 outbuf[1] = 0x00;
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162 outbuf[2] = 0x00;
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163 outbuf[3] = (nextcalc >> 8) & 0xFF;
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164 outbuf[4] = nextcalc & 0xFF;
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165 preambloc = ftell(of) + 1;
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166 writebytes(outbuf, 5, 1, of);
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167 }
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168 nextcalc += cl -> codelen;
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169 writebytes(cl -> bytes, cl -> codelen, 1, of);
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170 blocklen += cl -> codelen;
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171 }
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172 if (blocklen > 0)
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173 {
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174 fseek(of, preambloc, SEEK_SET);
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175 outbuf[0] = (blocklen >> 8) & 0xFF;
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176 outbuf[1] = blocklen & 0xFF;
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177 writebytes(outbuf, 2, 1, of);
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178 fseek(of, 0, SEEK_END);
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179 }
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180
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181 // now write postamble
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182 outbuf[0] = 0xFF;
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183 outbuf[1] = 0x00;
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184 outbuf[2] = 0x00;
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185 outbuf[3] = (as -> execaddr >> 8) & 0xFF;
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186 outbuf[4] = (as -> execaddr) & 0xFF;
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187 writebytes(outbuf, 5, 1, of);
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188 }
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189
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190 void write_code_obj_sbadd(sectiontab_t *s, unsigned char b)
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191 {
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192 if (s -> oblen >= s -> obsize)
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193 {
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194 s -> obytes = lwasm_realloc(s -> obytes, s -> obsize + 128);
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195 s -> obsize += 128;
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196 }
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197 s -> obytes[s -> oblen] = b;
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198 s -> oblen += 1;
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199 }
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200
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201 void write_code_obj(asmstate_t *as, FILE *of)
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202 {
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203 lwasm_line_t *l;
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204 sectiontab_t *s;
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205 lwasm_symbol_ent_t *se;
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206 export_list_t *ex;
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diff changeset
207 section_reloc_list_t *re;
718998b673ee Added incomplete references to object output and added support for section base terms in expression handler
lost
parents: 88
diff changeset
208 lwasm_expr_stack_node_t *sn;
88
6460a1fb5f1f Checkpoint: object format output
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parents: 87
diff changeset
209
85
918be0c02239 Started adding object target output
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parents: 48
diff changeset
210 int i;
87
41ff4686b46b Checkpoint: object format output
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parents: 86
diff changeset
211 unsigned char buf[16];
85
918be0c02239 Started adding object target output
lost
parents: 48
diff changeset
212
918be0c02239 Started adding object target output
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parents: 48
diff changeset
213 // output the magic number and file header
87
41ff4686b46b Checkpoint: object format output
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parents: 86
diff changeset
214 // the 8 is NOT an error
41ff4686b46b Checkpoint: object format output
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parents: 86
diff changeset
215 writebytes("LWOBJ16", 8, 1, of);
85
918be0c02239 Started adding object target output
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parents: 48
diff changeset
216
918be0c02239 Started adding object target output
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parents: 48
diff changeset
217 // run through the entire system and build the byte streams for each
918be0c02239 Started adding object target output
lost
parents: 48
diff changeset
218 // section; at the same time, generate a list of "local" symbols to
918be0c02239 Started adding object target output
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parents: 48
diff changeset
219 // output for each section
918be0c02239 Started adding object target output
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parents: 48
diff changeset
220 // NOTE: for "local" symbols, we will append \x01 and the ascii string
918be0c02239 Started adding object target output
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parents: 48
diff changeset
221 // of the context identifier (so sym in context 1 would be "sym\x011"
918be0c02239 Started adding object target output
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parents: 48
diff changeset
222 // we can do this because the linker can handle symbols with any
918be0c02239 Started adding object target output
lost
parents: 48
diff changeset
223 // character other than NUL.
918be0c02239 Started adding object target output
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parents: 48
diff changeset
224 // also we will generate a list of incomplete references for each
918be0c02239 Started adding object target output
lost
parents: 48
diff changeset
225 // section along with the actual definition that will be output
918be0c02239 Started adding object target output
lost
parents: 48
diff changeset
226
918be0c02239 Started adding object target output
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parents: 48
diff changeset
227 // once all this information is generated, we will output each section
918be0c02239 Started adding object target output
lost
parents: 48
diff changeset
228 // to the file
918be0c02239 Started adding object target output
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parents: 48
diff changeset
229
918be0c02239 Started adding object target output
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parents: 48
diff changeset
230 // NOTE: we build everything in memory then output it because the
918be0c02239 Started adding object target output
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parents: 48
diff changeset
231 // assembler accepts multiple instances of the same section but the
918be0c02239 Started adding object target output
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parents: 48
diff changeset
232 // linker expects only one instance of each section in the object file
918be0c02239 Started adding object target output
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parents: 48
diff changeset
233 // so we need to collect all the various pieces of a section together
918be0c02239 Started adding object target output
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parents: 48
diff changeset
234 // (also, the assembler treated multiple instances of the same section
918be0c02239 Started adding object target output
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parents: 48
diff changeset
235 // as continuations of previous sections so we would need to collect
918be0c02239 Started adding object target output
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parents: 48
diff changeset
236 // them together anyway.
918be0c02239 Started adding object target output
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parents: 48
diff changeset
237
918be0c02239 Started adding object target output
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parents: 48
diff changeset
238 for (l = as -> lineshead; l; l = l -> next)
918be0c02239 Started adding object target output
lost
parents: 48
diff changeset
239 {
918be0c02239 Started adding object target output
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parents: 48
diff changeset
240 if (l -> sect)
918be0c02239 Started adding object target output
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parents: 48
diff changeset
241 {
918be0c02239 Started adding object target output
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parents: 48
diff changeset
242 // we're in a section - need to output some bytes
918be0c02239 Started adding object target output
lost
parents: 48
diff changeset
243 for (i = 0; i < l -> codelen; i++)
918be0c02239 Started adding object target output
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parents: 48
diff changeset
244 write_code_obj_sbadd(l -> sect, l -> bytes[i]);
918be0c02239 Started adding object target output
lost
parents: 48
diff changeset
245 for (i = 0; i < l -> nocodelen; i++)
918be0c02239 Started adding object target output
lost
parents: 48
diff changeset
246 write_code_obj_sbadd(l -> sect, 0);
918be0c02239 Started adding object target output
lost
parents: 48
diff changeset
247
918be0c02239 Started adding object target output
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parents: 48
diff changeset
248 // do we have a "relocation"? If so, add a reference to the
918be0c02239 Started adding object target output
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parents: 48
diff changeset
249 // relocation table
918be0c02239 Started adding object target output
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parents: 48
diff changeset
250 if (l -> relocoff >= 0)
918be0c02239 Started adding object target output
lost
parents: 48
diff changeset
251 {
86
033a328a10ae Checkpoint: object target output
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parents: 85
diff changeset
252 // build the relocation reference for the linker
033a328a10ae Checkpoint: object target output
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parents: 85
diff changeset
253 re = lwasm_alloc(sizeof(section_reloc_list_t));
033a328a10ae Checkpoint: object target output
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parents: 85
diff changeset
254 re -> next = l -> sect -> rl;
033a328a10ae Checkpoint: object target output
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parents: 85
diff changeset
255 l -> sect -> rl = re;
033a328a10ae Checkpoint: object target output
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parents: 85
diff changeset
256
033a328a10ae Checkpoint: object target output
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parents: 85
diff changeset
257 re -> offset = l -> codeaddr + l -> relocoff;
033a328a10ae Checkpoint: object target output
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parents: 85
diff changeset
258 re -> expr = l -> exprs[0];
91
718998b673ee Added incomplete references to object output and added support for section base terms in expression handler
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parents: 88
diff changeset
259 re -> context = l -> context;
204
048ebb85f6ef Added 8 bit external references for base page addressing mode
lost
parents: 151
diff changeset
260 re -> relocsize = 2;
048ebb85f6ef Added 8 bit external references for base page addressing mode
lost
parents: 151
diff changeset
261 if (l -> reloc8bit)
048ebb85f6ef Added 8 bit external references for base page addressing mode
lost
parents: 151
diff changeset
262 re -> relocsize = 1;
85
918be0c02239 Started adding object target output
lost
parents: 48
diff changeset
263 }
918be0c02239 Started adding object target output
lost
parents: 48
diff changeset
264 }
918be0c02239 Started adding object target output
lost
parents: 48
diff changeset
265 }
87
41ff4686b46b Checkpoint: object format output
lost
parents: 86
diff changeset
266
41ff4686b46b Checkpoint: object format output
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parents: 86
diff changeset
267 // run through the sections
41ff4686b46b Checkpoint: object format output
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parents: 86
diff changeset
268 for (s = as -> sections; s; s = s -> next)
41ff4686b46b Checkpoint: object format output
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parents: 86
diff changeset
269 {
41ff4686b46b Checkpoint: object format output
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parents: 86
diff changeset
270 // write the name
41ff4686b46b Checkpoint: object format output
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parents: 86
diff changeset
271 writebytes(s -> name, strlen(s -> name) + 1, 1, of);
41ff4686b46b Checkpoint: object format output
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parents: 86
diff changeset
272
41ff4686b46b Checkpoint: object format output
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parents: 86
diff changeset
273 // write the flags
41ff4686b46b Checkpoint: object format output
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parents: 86
diff changeset
274 if (s -> flags & SECTION_BSS)
41ff4686b46b Checkpoint: object format output
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parents: 86
diff changeset
275 writebytes("\x01", 1, 1, of);
41ff4686b46b Checkpoint: object format output
lost
parents: 86
diff changeset
276
41ff4686b46b Checkpoint: object format output
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parents: 86
diff changeset
277 // indicate end of flags - the "" is NOT an error
41ff4686b46b Checkpoint: object format output
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parents: 86
diff changeset
278 writebytes("", 1, 1, of);
41ff4686b46b Checkpoint: object format output
lost
parents: 86
diff changeset
279
41ff4686b46b Checkpoint: object format output
lost
parents: 86
diff changeset
280
88
6460a1fb5f1f Checkpoint: object format output
lost
parents: 87
diff changeset
281 // now the local symbols
6460a1fb5f1f Checkpoint: object format output
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parents: 87
diff changeset
282 for (se = as -> symhead; se; se = se -> next)
6460a1fb5f1f Checkpoint: object format output
lost
parents: 87
diff changeset
283 {
6460a1fb5f1f Checkpoint: object format output
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parents: 87
diff changeset
284 // ignore symbols not in this section
6460a1fb5f1f Checkpoint: object format output
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parents: 87
diff changeset
285 if (se -> sect != s)
6460a1fb5f1f Checkpoint: object format output
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parents: 87
diff changeset
286 continue;
6460a1fb5f1f Checkpoint: object format output
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parents: 87
diff changeset
287
6460a1fb5f1f Checkpoint: object format output
lost
parents: 87
diff changeset
288 if (se -> flags & SYMBOL_SET)
6460a1fb5f1f Checkpoint: object format output
lost
parents: 87
diff changeset
289 continue;
6460a1fb5f1f Checkpoint: object format output
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parents: 87
diff changeset
290
6460a1fb5f1f Checkpoint: object format output
lost
parents: 87
diff changeset
291 if (se -> flags & SYMBOL_EXTERN)
6460a1fb5f1f Checkpoint: object format output
lost
parents: 87
diff changeset
292 continue;
6460a1fb5f1f Checkpoint: object format output
lost
parents: 87
diff changeset
293
6460a1fb5f1f Checkpoint: object format output
lost
parents: 87
diff changeset
294 writebytes(se -> sym, strlen(se -> sym), 1, of);
6460a1fb5f1f Checkpoint: object format output
lost
parents: 87
diff changeset
295 if (se -> context >= 0)
6460a1fb5f1f Checkpoint: object format output
lost
parents: 87
diff changeset
296 {
6460a1fb5f1f Checkpoint: object format output
lost
parents: 87
diff changeset
297 writebytes("\x01", 1, 1, of);
6460a1fb5f1f Checkpoint: object format output
lost
parents: 87
diff changeset
298 sprintf(buf, "%d", se -> context);
6460a1fb5f1f Checkpoint: object format output
lost
parents: 87
diff changeset
299 writebytes(buf, strlen(buf), 1, of);
6460a1fb5f1f Checkpoint: object format output
lost
parents: 87
diff changeset
300 }
6460a1fb5f1f Checkpoint: object format output
lost
parents: 87
diff changeset
301 // the "" is NOT an error
6460a1fb5f1f Checkpoint: object format output
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parents: 87
diff changeset
302 writebytes("", 1, 1, of);
6460a1fb5f1f Checkpoint: object format output
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parents: 87
diff changeset
303
6460a1fb5f1f Checkpoint: object format output
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parents: 87
diff changeset
304 // write the address
6460a1fb5f1f Checkpoint: object format output
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parents: 87
diff changeset
305 buf[0] = (se -> value >> 8) & 0xff;
6460a1fb5f1f Checkpoint: object format output
lost
parents: 87
diff changeset
306 buf[1] = se -> value & 0xff;
6460a1fb5f1f Checkpoint: object format output
lost
parents: 87
diff changeset
307 writebytes(buf, 2, 1, of);
6460a1fb5f1f Checkpoint: object format output
lost
parents: 87
diff changeset
308 }
6460a1fb5f1f Checkpoint: object format output
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parents: 87
diff changeset
309 // flag end of local symbol table - "" is NOT an error
6460a1fb5f1f Checkpoint: object format output
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parents: 87
diff changeset
310 writebytes("", 1, 1, of);
6460a1fb5f1f Checkpoint: object format output
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parents: 87
diff changeset
311
91
718998b673ee Added incomplete references to object output and added support for section base terms in expression handler
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parents: 88
diff changeset
312 // now the exports
718998b673ee Added incomplete references to object output and added support for section base terms in expression handler
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parents: 88
diff changeset
313 for (ex = s -> exports; ex; ex = ex -> next)
718998b673ee Added incomplete references to object output and added support for section base terms in expression handler
lost
parents: 88
diff changeset
314 {
718998b673ee Added incomplete references to object output and added support for section base terms in expression handler
lost
parents: 88
diff changeset
315 writebytes(ex -> sym, strlen(ex -> sym) + 1, 1, of);
718998b673ee Added incomplete references to object output and added support for section base terms in expression handler
lost
parents: 88
diff changeset
316 buf[0] = (ex -> offset >> 8) & 0xff;
718998b673ee Added incomplete references to object output and added support for section base terms in expression handler
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parents: 88
diff changeset
317 buf[1] = ex -> offset & 0xff;
718998b673ee Added incomplete references to object output and added support for section base terms in expression handler
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parents: 88
diff changeset
318 writebytes(buf, 2, 1, of);
718998b673ee Added incomplete references to object output and added support for section base terms in expression handler
lost
parents: 88
diff changeset
319 }
718998b673ee Added incomplete references to object output and added support for section base terms in expression handler
lost
parents: 88
diff changeset
320
718998b673ee Added incomplete references to object output and added support for section base terms in expression handler
lost
parents: 88
diff changeset
321 // flag end of exported symbols - "" is NOT an error
718998b673ee Added incomplete references to object output and added support for section base terms in expression handler
lost
parents: 88
diff changeset
322 writebytes("", 1, 1, of);
718998b673ee Added incomplete references to object output and added support for section base terms in expression handler
lost
parents: 88
diff changeset
323
718998b673ee Added incomplete references to object output and added support for section base terms in expression handler
lost
parents: 88
diff changeset
324 // now output the "incomplete references"
718998b673ee Added incomplete references to object output and added support for section base terms in expression handler
lost
parents: 88
diff changeset
325 // this being the most complex bit
718998b673ee Added incomplete references to object output and added support for section base terms in expression handler
lost
parents: 88
diff changeset
326 for (re = s -> rl; re; re = re -> next)
718998b673ee Added incomplete references to object output and added support for section base terms in expression handler
lost
parents: 88
diff changeset
327 {
718998b673ee Added incomplete references to object output and added support for section base terms in expression handler
lost
parents: 88
diff changeset
328 if (re -> expr == NULL)
718998b673ee Added incomplete references to object output and added support for section base terms in expression handler
lost
parents: 88
diff changeset
329 {
718998b673ee Added incomplete references to object output and added support for section base terms in expression handler
lost
parents: 88
diff changeset
330 // this is an error but we'll simply ignore it
718998b673ee Added incomplete references to object output and added support for section base terms in expression handler
lost
parents: 88
diff changeset
331 // and not output this expression
718998b673ee Added incomplete references to object output and added support for section base terms in expression handler
lost
parents: 88
diff changeset
332 continue;
718998b673ee Added incomplete references to object output and added support for section base terms in expression handler
lost
parents: 88
diff changeset
333 }
718998b673ee Added incomplete references to object output and added support for section base terms in expression handler
lost
parents: 88
diff changeset
334
718998b673ee Added incomplete references to object output and added support for section base terms in expression handler
lost
parents: 88
diff changeset
335 // work through each term in the expression and output
718998b673ee Added incomplete references to object output and added support for section base terms in expression handler
lost
parents: 88
diff changeset
336 // the proper equivalent to the object file
204
048ebb85f6ef Added 8 bit external references for base page addressing mode
lost
parents: 151
diff changeset
337 if (re -> relocsize == 1)
048ebb85f6ef Added 8 bit external references for base page addressing mode
lost
parents: 151
diff changeset
338 {
048ebb85f6ef Added 8 bit external references for base page addressing mode
lost
parents: 151
diff changeset
339 // flag an 8 bit relocation (low 8 bits will be used)
048ebb85f6ef Added 8 bit external references for base page addressing mode
lost
parents: 151
diff changeset
340 buf[0] = 0xFF;
048ebb85f6ef Added 8 bit external references for base page addressing mode
lost
parents: 151
diff changeset
341 buf[1] = 0x01;
048ebb85f6ef Added 8 bit external references for base page addressing mode
lost
parents: 151
diff changeset
342 writebytes(buf, 2, 1, of);
048ebb85f6ef Added 8 bit external references for base page addressing mode
lost
parents: 151
diff changeset
343 }
91
718998b673ee Added incomplete references to object output and added support for section base terms in expression handler
lost
parents: 88
diff changeset
344 for (sn = re -> expr -> head; sn; sn = sn -> next)
718998b673ee Added incomplete references to object output and added support for section base terms in expression handler
lost
parents: 88
diff changeset
345 {
718998b673ee Added incomplete references to object output and added support for section base terms in expression handler
lost
parents: 88
diff changeset
346 switch (sn -> term -> term_type)
718998b673ee Added incomplete references to object output and added support for section base terms in expression handler
lost
parents: 88
diff changeset
347 {
718998b673ee Added incomplete references to object output and added support for section base terms in expression handler
lost
parents: 88
diff changeset
348 case LWASM_TERM_OPER:
718998b673ee Added incomplete references to object output and added support for section base terms in expression handler
lost
parents: 88
diff changeset
349 buf[0] = 0x04;
718998b673ee Added incomplete references to object output and added support for section base terms in expression handler
lost
parents: 88
diff changeset
350 buf[1] = sn -> term -> value;
718998b673ee Added incomplete references to object output and added support for section base terms in expression handler
lost
parents: 88
diff changeset
351 writebytes(buf, 2, 1, of);
718998b673ee Added incomplete references to object output and added support for section base terms in expression handler
lost
parents: 88
diff changeset
352 break;
718998b673ee Added incomplete references to object output and added support for section base terms in expression handler
lost
parents: 88
diff changeset
353
718998b673ee Added incomplete references to object output and added support for section base terms in expression handler
lost
parents: 88
diff changeset
354 case LWASM_TERM_INT:
718998b673ee Added incomplete references to object output and added support for section base terms in expression handler
lost
parents: 88
diff changeset
355 buf[0] = 0x01;
718998b673ee Added incomplete references to object output and added support for section base terms in expression handler
lost
parents: 88
diff changeset
356 buf[1] = (sn -> term -> value >> 8) & 0xff;
718998b673ee Added incomplete references to object output and added support for section base terms in expression handler
lost
parents: 88
diff changeset
357 buf[2] = sn -> term -> value & 0xff;
718998b673ee Added incomplete references to object output and added support for section base terms in expression handler
lost
parents: 88
diff changeset
358 writebytes(buf, 3, 1, of);
718998b673ee Added incomplete references to object output and added support for section base terms in expression handler
lost
parents: 88
diff changeset
359 break;
718998b673ee Added incomplete references to object output and added support for section base terms in expression handler
lost
parents: 88
diff changeset
360
718998b673ee Added incomplete references to object output and added support for section base terms in expression handler
lost
parents: 88
diff changeset
361 case LWASM_TERM_SECBASE:
718998b673ee Added incomplete references to object output and added support for section base terms in expression handler
lost
parents: 88
diff changeset
362 writebytes("\x05", 1, 1, of);
718998b673ee Added incomplete references to object output and added support for section base terms in expression handler
lost
parents: 88
diff changeset
363 break;
718998b673ee Added incomplete references to object output and added support for section base terms in expression handler
lost
parents: 88
diff changeset
364
718998b673ee Added incomplete references to object output and added support for section base terms in expression handler
lost
parents: 88
diff changeset
365 case LWASM_TERM_SYM:
718998b673ee Added incomplete references to object output and added support for section base terms in expression handler
lost
parents: 88
diff changeset
366 // now for the ugly part - resolve a symbol reference
718998b673ee Added incomplete references to object output and added support for section base terms in expression handler
lost
parents: 88
diff changeset
367 // and determine whether it's internal, external, or
718998b673ee Added incomplete references to object output and added support for section base terms in expression handler
lost
parents: 88
diff changeset
368 // a section base
718998b673ee Added incomplete references to object output and added support for section base terms in expression handler
lost
parents: 88
diff changeset
369 se = lwasm_find_symbol(as, sn -> term -> symbol, re -> context);
718998b673ee Added incomplete references to object output and added support for section base terms in expression handler
lost
parents: 88
diff changeset
370 if (!se)
718998b673ee Added incomplete references to object output and added support for section base terms in expression handler
lost
parents: 88
diff changeset
371 se = lwasm_find_symbol(as, sn -> term -> symbol, -1);
718998b673ee Added incomplete references to object output and added support for section base terms in expression handler
lost
parents: 88
diff changeset
372 if (!se || se -> flags & SYMBOL_EXTERN)
718998b673ee Added incomplete references to object output and added support for section base terms in expression handler
lost
parents: 88
diff changeset
373 {
718998b673ee Added incomplete references to object output and added support for section base terms in expression handler
lost
parents: 88
diff changeset
374 // not found - assume external reference
718998b673ee Added incomplete references to object output and added support for section base terms in expression handler
lost
parents: 88
diff changeset
375 // found but flagged external - handle it
718998b673ee Added incomplete references to object output and added support for section base terms in expression handler
lost
parents: 88
diff changeset
376 writebytes("\x02", 1, 1, of);
718998b673ee Added incomplete references to object output and added support for section base terms in expression handler
lost
parents: 88
diff changeset
377 writebytes(se -> sym, strlen(se -> sym) + 1, 1, of);
718998b673ee Added incomplete references to object output and added support for section base terms in expression handler
lost
parents: 88
diff changeset
378 break;
718998b673ee Added incomplete references to object output and added support for section base terms in expression handler
lost
parents: 88
diff changeset
379 }
718998b673ee Added incomplete references to object output and added support for section base terms in expression handler
lost
parents: 88
diff changeset
380 // a local symbol reference here
718998b673ee Added incomplete references to object output and added support for section base terms in expression handler
lost
parents: 88
diff changeset
381 writebytes("\x03", 1, 1, of);
718998b673ee Added incomplete references to object output and added support for section base terms in expression handler
lost
parents: 88
diff changeset
382 writebytes(se -> sym, strlen(se -> sym), 1, of);
718998b673ee Added incomplete references to object output and added support for section base terms in expression handler
lost
parents: 88
diff changeset
383 if (se -> context >= 0)
718998b673ee Added incomplete references to object output and added support for section base terms in expression handler
lost
parents: 88
diff changeset
384 {
718998b673ee Added incomplete references to object output and added support for section base terms in expression handler
lost
parents: 88
diff changeset
385 writebytes("\x01", 1, 1, of);
718998b673ee Added incomplete references to object output and added support for section base terms in expression handler
lost
parents: 88
diff changeset
386 sprintf(buf, "%d", se -> context);
718998b673ee Added incomplete references to object output and added support for section base terms in expression handler
lost
parents: 88
diff changeset
387 writebytes(buf, strlen(buf), 1, of);
718998b673ee Added incomplete references to object output and added support for section base terms in expression handler
lost
parents: 88
diff changeset
388 }
718998b673ee Added incomplete references to object output and added support for section base terms in expression handler
lost
parents: 88
diff changeset
389 writebytes("", 1, 1, of);
718998b673ee Added incomplete references to object output and added support for section base terms in expression handler
lost
parents: 88
diff changeset
390 break;
718998b673ee Added incomplete references to object output and added support for section base terms in expression handler
lost
parents: 88
diff changeset
391
718998b673ee Added incomplete references to object output and added support for section base terms in expression handler
lost
parents: 88
diff changeset
392 default:
718998b673ee Added incomplete references to object output and added support for section base terms in expression handler
lost
parents: 88
diff changeset
393 // unrecognized term type - replace with integer 0
718998b673ee Added incomplete references to object output and added support for section base terms in expression handler
lost
parents: 88
diff changeset
394 buf[0] = 0x01;
718998b673ee Added incomplete references to object output and added support for section base terms in expression handler
lost
parents: 88
diff changeset
395 buf[1] = 0x00;
718998b673ee Added incomplete references to object output and added support for section base terms in expression handler
lost
parents: 88
diff changeset
396 buf[2] = 0x00;
718998b673ee Added incomplete references to object output and added support for section base terms in expression handler
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397 writebytes(buf, 3, 1, of);
718998b673ee Added incomplete references to object output and added support for section base terms in expression handler
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398 break;
718998b673ee Added incomplete references to object output and added support for section base terms in expression handler
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399 }
718998b673ee Added incomplete references to object output and added support for section base terms in expression handler
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400 }
718998b673ee Added incomplete references to object output and added support for section base terms in expression handler
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401
718998b673ee Added incomplete references to object output and added support for section base terms in expression handler
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402 // flag end of expressions
718998b673ee Added incomplete references to object output and added support for section base terms in expression handler
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403 writebytes("", 1, 1, of);
718998b673ee Added incomplete references to object output and added support for section base terms in expression handler
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404
718998b673ee Added incomplete references to object output and added support for section base terms in expression handler
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405 // write the offset
718998b673ee Added incomplete references to object output and added support for section base terms in expression handler
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406 buf[0] = (re -> offset >> 8) & 0xff;
718998b673ee Added incomplete references to object output and added support for section base terms in expression handler
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407 buf[1] = re -> offset & 0xff;
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diff changeset
408 writebytes(buf, 2, 1, of);
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409 }
718998b673ee Added incomplete references to object output and added support for section base terms in expression handler
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410 // flag end of incomplete references list
718998b673ee Added incomplete references to object output and added support for section base terms in expression handler
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411 writebytes("", 1, 1, of);
718998b673ee Added incomplete references to object output and added support for section base terms in expression handler
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412
87
41ff4686b46b Checkpoint: object format output
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413 // now blast out the code
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414
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415 // length
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416 buf[0] = s -> oblen >> 8 & 0xff;
41ff4686b46b Checkpoint: object format output
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417 buf[1] = s -> oblen & 0xff;
41ff4686b46b Checkpoint: object format output
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418 writebytes(buf, 2, 1, of);
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419
41ff4686b46b Checkpoint: object format output
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420 if (!(s -> flags & SECTION_BSS))
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421 {
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422 writebytes(s -> obytes, s -> oblen, 1, of);
41ff4686b46b Checkpoint: object format output
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423 }
41ff4686b46b Checkpoint: object format output
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424 }
41ff4686b46b Checkpoint: object format output
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425
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426 // flag no more sections
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427 // the "" is NOT an error
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428 writebytes("", 1, 1, of);
85
918be0c02239 Started adding object target output
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parents: 48
diff changeset
429 }