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annotate lwlink/output.c @ 254:c7a41b4c89b3 2.x
Added struct support to LWASM
| author | lost |
|---|---|
| date | Sat, 19 Dec 2009 06:38:43 +0000 |
| parents | 4dc2a10997a6 |
| children |
| rev | line source |
|---|---|
| 121 | 1 /* |
| 2 output.c | |
| 3 Copyright © 2009 William Astle | |
| 4 | |
| 5 This file is part of LWLINK. | |
| 6 | |
| 7 LWLINK is free software: you can redistribute it and/or modify it under the | |
| 8 terms of the GNU General Public License as published by the Free Software | |
| 9 Foundation, either version 3 of the License, or (at your option) any later | |
| 10 version. | |
| 11 | |
| 12 This program is distributed in the hope that it will be useful, but WITHOUT | |
| 13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
| 15 more details. | |
| 16 | |
| 17 You should have received a copy of the GNU General Public License along with | |
| 18 this program. If not, see <http://www.gnu.org/licenses/>. | |
| 19 | |
| 20 | |
| 21 Actually output the binary | |
| 22 */ | |
| 23 | |
| 212 | 24 #include <config.h> |
| 121 | 25 |
| 26 #include <stdio.h> | |
| 27 #include <stdlib.h> | |
| 187 | 28 #include <string.h> |
| 121 | 29 |
| 30 #include "lwlink.h" | |
| 31 | |
| 32 // this prevents warnings about not using the return value of fwrite() | |
| 33 // and, theoretically, can be replaced with a function that handles things | |
| 34 // better in the future | |
| 35 #define writebytes(s, l, c, f) do { int r; r = fwrite((s), (l), (c), (f)); } while (0) | |
| 36 | |
| 37 void do_output_decb(FILE *of); | |
| 38 void do_output_raw(FILE *of); | |
| 187 | 39 void do_output_lwex0(FILE *of); |
| 121 | 40 |
| 41 void do_output(void) | |
| 42 { | |
| 43 FILE *of; | |
| 44 | |
| 45 of = fopen(outfile, "wb"); | |
| 46 if (!of) | |
| 47 { | |
| 48 fprintf(stderr, "Cannot open output file %s: ", outfile); | |
| 49 perror(""); | |
| 50 exit(1); | |
| 51 } | |
| 52 | |
| 53 switch (outformat) | |
| 54 { | |
| 55 case OUTPUT_DECB: | |
| 56 do_output_decb(of); | |
| 57 break; | |
| 58 | |
| 59 case OUTPUT_RAW: | |
| 60 do_output_raw(of); | |
| 61 break; | |
| 187 | 62 |
| 63 case OUTPUT_LWEX0: | |
| 64 do_output_lwex0(of); | |
| 65 break; | |
| 121 | 66 |
| 67 default: | |
| 68 fprintf(stderr, "Unknown output format doing output!\n"); | |
| 69 exit(111); | |
| 70 } | |
| 71 | |
| 72 fclose(of); | |
| 73 } | |
| 74 | |
| 75 void do_output_decb(FILE *of) | |
| 76 { | |
|
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77 int sn, sn2; |
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78 int cloc, olen; |
| 121 | 79 unsigned char buf[5]; |
| 80 | |
| 81 for (sn = 0; sn < nsects; sn++) | |
| 82 { | |
| 83 if (sectlist[sn].ptr -> flags & SECTION_BSS) | |
| 84 { | |
| 85 // no output for a BSS section | |
| 86 continue; | |
| 87 } | |
| 132 | 88 if (sectlist[sn].ptr -> codesize == 0) |
| 89 { | |
| 90 // don't generate output for a zero size section | |
| 91 continue; | |
| 92 } | |
|
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93 |
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94 // calculate the length of this output block |
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95 cloc = sectlist[sn].ptr -> loadaddress; |
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96 olen = 0; |
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97 for (sn2 = sn; sn2 < nsects; sn2++) |
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98 { |
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99 // ignore BSS sections |
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100 if (sectlist[sn2].ptr -> flags & SECTION_BSS) |
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101 continue; |
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102 // ignore zero length sections |
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103 if (sectlist[sn2].ptr -> codesize == 0) |
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104 continue; |
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105 if (cloc != sectlist[sn2].ptr -> loadaddress) |
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106 break; |
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107 olen += sectlist[sn2].ptr -> codesize; |
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108 cloc += sectlist[sn2].ptr -> codesize; |
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109 } |
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110 |
| 121 | 111 // write a preamble |
| 112 buf[0] = 0x00; | |
|
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113 buf[1] = olen >> 8; |
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114 buf[2] = olen & 0xff; |
| 121 | 115 buf[3] = sectlist[sn].ptr -> loadaddress >> 8; |
| 116 buf[4] = sectlist[sn].ptr -> loadaddress & 0xff; | |
| 117 writebytes(buf, 1, 5, of); | |
|
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118 for (; sn < sn2; sn++) |
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119 { |
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120 if (sectlist[sn].ptr -> flags & SECTION_BSS) |
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302b8db5fd89
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121 continue; |
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122 if (sectlist[sn].ptr -> codesize == 0) |
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123 continue; |
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124 writebytes(sectlist[sn].ptr -> code, 1, sectlist[sn].ptr -> codesize, of); |
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125 } |
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126 sn--; |
| 121 | 127 } |
| 128 // write a postamble | |
| 129 buf[0] = 0xff; | |
| 130 buf[1] = 0x00; | |
| 131 buf[2] = 0x00; | |
| 132 buf[3] = linkscript.execaddr >> 8; | |
| 133 buf[4] = linkscript.execaddr & 0xff; | |
| 134 writebytes(buf, 1, 5, of); | |
| 135 } | |
| 136 | |
| 137 void do_output_raw(FILE *of) | |
| 138 { | |
| 123 | 139 int nskips = 0; // used to output blanks for BSS inline |
| 140 int sn; | |
| 141 | |
| 142 for (sn = 0; sn < nsects; sn++) | |
| 143 { | |
| 144 if (sectlist[sn].ptr -> flags & SECTION_BSS) | |
| 145 { | |
| 146 // no output for a BSS section | |
| 147 nskips += sectlist[sn].ptr -> codesize; | |
| 148 continue; | |
| 149 } | |
| 150 while (nskips > 0) | |
| 151 { | |
| 152 // the "" is not an error - it turns into a single NUL byte! | |
| 153 writebytes("", 1, 1, of); | |
| 154 nskips--; | |
| 155 } | |
| 156 writebytes(sectlist[sn].ptr -> code, 1, sectlist[sn].ptr -> codesize, of); | |
| 157 } | |
| 121 | 158 } |
| 187 | 159 |
| 160 void do_output_lwex0(FILE *of) | |
| 161 { | |
| 162 int nskips = 0; // used to output blanks for BSS inline | |
| 163 int sn; | |
| 164 int codedatasize = 0; | |
| 252 | 165 int coffs; |
| 187 | 166 unsigned char buf[32]; |
| 252 | 167 int fsize = 0; |
| 168 | |
| 187 | 169 // calculate items for the file header |
| 170 for (sn = 0; sn < nsects; sn++) | |
| 171 { | |
| 252 | 172 // fprintf(stderr, "Counting: %s (%s) at %04X (%04X bytes), calc total = %04X\n", sectlist[sn].ptr -> name, sectlist[sn].ptr -> file -> filename, sectlist[sn].ptr -> loadaddress, sectlist[sn].ptr -> codesize, codedatasize); |
| 187 | 173 if (sectlist[sn].ptr -> flags & SECTION_BSS) |
| 174 { | |
| 175 // no output for a BSS section | |
| 176 nskips += sectlist[sn].ptr -> codesize; | |
| 177 continue; | |
| 178 } | |
| 179 codedatasize += nskips; | |
| 180 nskips = 0; | |
| 181 codedatasize += sectlist[sn].ptr -> codesize; | |
| 182 } | |
| 183 | |
| 184 // output the file header | |
| 185 buf[0] = 'L'; | |
| 186 buf[1] = 'W'; | |
| 187 buf[2] = 'E'; | |
| 188 buf[3] = 'X'; | |
| 189 buf[4] = 0; // version 0 | |
| 190 buf[5] = 0; // low stack | |
| 191 buf[6] = linkscript.stacksize / 256; | |
| 192 buf[7] = linkscript.stacksize & 0xff; | |
| 193 buf[8] = nskips / 256; | |
| 194 buf[9] = nskips & 0xff; | |
| 195 buf[10] = codedatasize / 256; | |
| 196 buf[11] = codedatasize & 0xff; | |
| 197 buf[12] = linkscript.execaddr / 256; | |
| 198 buf[13] = linkscript.execaddr & 0xff; | |
| 199 memset(buf + 14, 0, 18); | |
| 252 | 200 |
| 201 // fprintf(stderr, "Exec addr %04X, stacksize %04X, codesize %04X, bss size %04X\n", linkscript.execaddr, linkscript.stacksize, codedatasize, nskips); | |
| 187 | 202 |
| 203 writebytes(buf, 1, 32, of); | |
| 252 | 204 fsize = 32; |
| 205 coffs = 0x100; | |
| 206 nskips = 0; | |
| 187 | 207 // output the data |
| 208 // NOTE: disjoint load addresses will not work correctly!!!!! | |
| 209 for (sn = 0; sn < nsects; sn++) | |
| 210 { | |
| 252 | 211 // fprintf(stderr, "Outputting: %s (%s) at %04X (%04X bytes), calc offset = %04X, file offset = %04X\n", sectlist[sn].ptr -> name, sectlist[sn].ptr -> file -> filename, sectlist[sn].ptr -> loadaddress, sectlist[sn].ptr -> codesize, coffs, fsize); |
| 187 | 212 if (sectlist[sn].ptr -> flags & SECTION_BSS) |
| 213 { | |
| 214 // no output for a BSS section | |
| 215 nskips += sectlist[sn].ptr -> codesize; | |
| 252 | 216 coffs += sectlist[sn].ptr -> codesize; |
| 187 | 217 continue; |
| 218 } | |
| 219 while (nskips > 0) | |
| 220 { | |
| 221 // the "" is not an error - it turns into a single NUL byte! | |
| 222 writebytes("", 1, 1, of); | |
| 223 nskips--; | |
| 252 | 224 fsize += 1; |
| 187 | 225 } |
| 226 writebytes(sectlist[sn].ptr -> code, 1, sectlist[sn].ptr -> codesize, of); | |
| 252 | 227 coffs += sectlist[sn].ptr -> codesize; |
| 228 fsize += sectlist[sn].ptr -> codesize; | |
| 187 | 229 } |
| 230 } |