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annotate lwlink/output.c @ 192:bfd0fb0a85c2
Allow exporting multiple symbols on a single directive
| author | lost |
|---|---|
| date | Sun, 22 Mar 2009 16:28:40 +0000 |
| parents | 857cb407229e |
| children | bae1e3ecdce1 |
| 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 | |
| 24 #ifdef HAVE_CONFIG_H | |
| 25 #include "config.h" | |
| 26 #endif | |
| 27 | |
| 28 #include <stdio.h> | |
| 29 #include <stdlib.h> | |
| 187 | 30 #include <string.h> |
| 121 | 31 |
| 32 #include "lwlink.h" | |
| 33 | |
| 34 // this prevents warnings about not using the return value of fwrite() | |
| 35 // and, theoretically, can be replaced with a function that handles things | |
| 36 // better in the future | |
| 37 #define writebytes(s, l, c, f) do { int r; r = fwrite((s), (l), (c), (f)); } while (0) | |
| 38 | |
| 39 void do_output_decb(FILE *of); | |
| 40 void do_output_raw(FILE *of); | |
| 187 | 41 void do_output_lwex0(FILE *of); |
| 121 | 42 |
| 43 void do_output(void) | |
| 44 { | |
| 45 FILE *of; | |
| 46 | |
| 47 of = fopen(outfile, "wb"); | |
| 48 if (!of) | |
| 49 { | |
| 50 fprintf(stderr, "Cannot open output file %s: ", outfile); | |
| 51 perror(""); | |
| 52 exit(1); | |
| 53 } | |
| 54 | |
| 55 switch (outformat) | |
| 56 { | |
| 57 case OUTPUT_DECB: | |
| 58 do_output_decb(of); | |
| 59 break; | |
| 60 | |
| 61 case OUTPUT_RAW: | |
| 62 do_output_raw(of); | |
| 63 break; | |
| 187 | 64 |
| 65 case OUTPUT_LWEX0: | |
| 66 do_output_lwex0(of); | |
| 67 break; | |
| 121 | 68 |
| 69 default: | |
| 70 fprintf(stderr, "Unknown output format doing output!\n"); | |
| 71 exit(111); | |
| 72 } | |
| 73 | |
| 74 fclose(of); | |
| 75 } | |
| 76 | |
| 77 void do_output_decb(FILE *of) | |
| 78 { | |
|
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79 int sn, sn2; |
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80 int cloc, olen; |
| 121 | 81 unsigned char buf[5]; |
| 82 | |
| 83 for (sn = 0; sn < nsects; sn++) | |
| 84 { | |
| 85 if (sectlist[sn].ptr -> flags & SECTION_BSS) | |
| 86 { | |
| 87 // no output for a BSS section | |
| 88 continue; | |
| 89 } | |
| 132 | 90 if (sectlist[sn].ptr -> codesize == 0) |
| 91 { | |
| 92 // don't generate output for a zero size section | |
| 93 continue; | |
| 94 } | |
|
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95 |
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96 // calculate the length of this output block |
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97 cloc = sectlist[sn].ptr -> loadaddress; |
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98 olen = 0; |
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99 for (sn2 = sn; sn2 < nsects; sn2++) |
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100 { |
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101 // ignore BSS sections |
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102 if (sectlist[sn2].ptr -> flags & SECTION_BSS) |
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103 continue; |
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104 // ignore zero length sections |
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105 if (sectlist[sn2].ptr -> codesize == 0) |
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106 continue; |
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107 if (cloc != sectlist[sn2].ptr -> loadaddress) |
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108 break; |
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109 olen += sectlist[sn2].ptr -> codesize; |
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110 cloc += sectlist[sn2].ptr -> codesize; |
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111 } |
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112 |
| 121 | 113 // write a preamble |
| 114 buf[0] = 0x00; | |
|
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115 buf[1] = olen >> 8; |
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116 buf[2] = olen & 0xff; |
| 121 | 117 buf[3] = sectlist[sn].ptr -> loadaddress >> 8; |
| 118 buf[4] = sectlist[sn].ptr -> loadaddress & 0xff; | |
| 119 writebytes(buf, 1, 5, of); | |
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120 for (; sn < sn2; sn++) |
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121 { |
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122 if (sectlist[sn].ptr -> flags & SECTION_BSS) |
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123 continue; |
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124 if (sectlist[sn].ptr -> codesize == 0) |
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125 continue; |
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126 writebytes(sectlist[sn].ptr -> code, 1, sectlist[sn].ptr -> codesize, of); |
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127 } |
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128 sn--; |
| 121 | 129 } |
| 130 // write a postamble | |
| 131 buf[0] = 0xff; | |
| 132 buf[1] = 0x00; | |
| 133 buf[2] = 0x00; | |
| 134 buf[3] = linkscript.execaddr >> 8; | |
| 135 buf[4] = linkscript.execaddr & 0xff; | |
| 136 writebytes(buf, 1, 5, of); | |
| 137 } | |
| 138 | |
| 139 void do_output_raw(FILE *of) | |
| 140 { | |
| 123 | 141 int nskips = 0; // used to output blanks for BSS inline |
| 142 int sn; | |
| 143 | |
| 144 for (sn = 0; sn < nsects; sn++) | |
| 145 { | |
| 146 if (sectlist[sn].ptr -> flags & SECTION_BSS) | |
| 147 { | |
| 148 // no output for a BSS section | |
| 149 nskips += sectlist[sn].ptr -> codesize; | |
| 150 continue; | |
| 151 } | |
| 152 while (nskips > 0) | |
| 153 { | |
| 154 // the "" is not an error - it turns into a single NUL byte! | |
| 155 writebytes("", 1, 1, of); | |
| 156 nskips--; | |
| 157 } | |
| 158 writebytes(sectlist[sn].ptr -> code, 1, sectlist[sn].ptr -> codesize, of); | |
| 159 } | |
| 121 | 160 } |
| 187 | 161 |
| 162 void do_output_lwex0(FILE *of) | |
| 163 { | |
| 164 int nskips = 0; // used to output blanks for BSS inline | |
| 165 int sn; | |
| 166 int codedatasize = 0; | |
| 167 unsigned char buf[32]; | |
| 168 | |
| 169 // calculate items for the file header | |
| 170 for (sn = 0; sn < nsects; sn++) | |
| 171 { | |
| 172 if (sectlist[sn].ptr -> flags & SECTION_BSS) | |
| 173 { | |
| 174 // no output for a BSS section | |
| 175 nskips += sectlist[sn].ptr -> codesize; | |
| 176 continue; | |
| 177 } | |
| 178 codedatasize += nskips; | |
| 179 nskips = 0; | |
| 180 codedatasize += sectlist[sn].ptr -> codesize; | |
| 181 } | |
| 182 | |
| 183 // output the file header | |
| 184 buf[0] = 'L'; | |
| 185 buf[1] = 'W'; | |
| 186 buf[2] = 'E'; | |
| 187 buf[3] = 'X'; | |
| 188 buf[4] = 0; // version 0 | |
| 189 buf[5] = 0; // low stack | |
| 190 buf[6] = linkscript.stacksize / 256; | |
| 191 buf[7] = linkscript.stacksize & 0xff; | |
| 192 buf[8] = nskips / 256; | |
| 193 buf[9] = nskips & 0xff; | |
| 194 buf[10] = codedatasize / 256; | |
| 195 buf[11] = codedatasize & 0xff; | |
| 196 buf[12] = linkscript.execaddr / 256; | |
| 197 buf[13] = linkscript.execaddr & 0xff; | |
| 198 memset(buf + 14, 0, 18); | |
| 199 | |
| 200 writebytes(buf, 1, 32, of); | |
| 201 // output the data | |
| 202 // NOTE: disjoint load addresses will not work correctly!!!!! | |
| 203 for (sn = 0; sn < nsects; sn++) | |
| 204 { | |
| 205 if (sectlist[sn].ptr -> flags & SECTION_BSS) | |
| 206 { | |
| 207 // no output for a BSS section | |
| 208 nskips += sectlist[sn].ptr -> codesize; | |
| 209 continue; | |
| 210 } | |
| 211 while (nskips > 0) | |
| 212 { | |
| 213 // the "" is not an error - it turns into a single NUL byte! | |
| 214 writebytes("", 1, 1, of); | |
| 215 nskips--; | |
| 216 } | |
| 217 writebytes(sectlist[sn].ptr -> code, 1, sectlist[sn].ptr -> codesize, of); | |
| 218 } | |
| 219 } |