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annotate lwlink/output.c @ 183:302b8db5fd89
modified lwlink to merge contiguous sections in the DECB output file to avoid the explosion of preambles
| author | lost |
|---|---|
| date | Sat, 21 Mar 2009 17:03:42 +0000 |
| parents | 106c2fe3c9d9 |
| children | 857cb407229e |
| 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> | |
| 30 | |
| 31 #include "lwlink.h" | |
| 32 | |
| 33 // this prevents warnings about not using the return value of fwrite() | |
| 34 // and, theoretically, can be replaced with a function that handles things | |
| 35 // better in the future | |
| 36 #define writebytes(s, l, c, f) do { int r; r = fwrite((s), (l), (c), (f)); } while (0) | |
| 37 | |
| 38 void do_output_decb(FILE *of); | |
| 39 void do_output_raw(FILE *of); | |
| 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; | |
| 62 | |
| 63 default: | |
| 64 fprintf(stderr, "Unknown output format doing output!\n"); | |
| 65 exit(111); | |
| 66 } | |
| 67 | |
| 68 fclose(of); | |
| 69 } | |
| 70 | |
| 71 void do_output_decb(FILE *of) | |
| 72 { | |
|
183
302b8db5fd89
modified lwlink to merge contiguous sections in the DECB output file to avoid the explosion of preambles
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73 int sn, sn2; |
|
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74 int cloc, olen; |
| 121 | 75 unsigned char buf[5]; |
| 76 | |
| 77 for (sn = 0; sn < nsects; sn++) | |
| 78 { | |
| 79 if (sectlist[sn].ptr -> flags & SECTION_BSS) | |
| 80 { | |
| 81 // no output for a BSS section | |
| 82 continue; | |
| 83 } | |
| 132 | 84 if (sectlist[sn].ptr -> codesize == 0) |
| 85 { | |
| 86 // don't generate output for a zero size section | |
| 87 continue; | |
| 88 } | |
|
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89 |
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90 // calculate the length of this output block |
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91 cloc = sectlist[sn].ptr -> loadaddress; |
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92 olen = 0; |
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modified lwlink to merge contiguous sections in the DECB output file to avoid the explosion of preambles
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93 for (sn2 = sn; sn2 < nsects; sn2++) |
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94 { |
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95 // ignore BSS sections |
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modified lwlink to merge contiguous sections in the DECB output file to avoid the explosion of preambles
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96 if (sectlist[sn2].ptr -> flags & SECTION_BSS) |
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97 continue; |
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98 // ignore zero length sections |
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302b8db5fd89
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99 if (sectlist[sn2].ptr -> codesize == 0) |
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100 continue; |
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101 if (cloc != sectlist[sn2].ptr -> loadaddress) |
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102 break; |
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103 olen += sectlist[sn2].ptr -> codesize; |
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302b8db5fd89
modified lwlink to merge contiguous sections in the DECB output file to avoid the explosion of preambles
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104 cloc += sectlist[sn2].ptr -> codesize; |
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105 } |
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106 |
| 121 | 107 // write a preamble |
| 108 buf[0] = 0x00; | |
|
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109 buf[1] = olen >> 8; |
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302b8db5fd89
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110 buf[2] = olen & 0xff; |
| 121 | 111 buf[3] = sectlist[sn].ptr -> loadaddress >> 8; |
| 112 buf[4] = sectlist[sn].ptr -> loadaddress & 0xff; | |
| 113 writebytes(buf, 1, 5, of); | |
|
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302b8db5fd89
modified lwlink to merge contiguous sections in the DECB output file to avoid the explosion of preambles
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114 for (; sn < sn2; sn++) |
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302b8db5fd89
modified lwlink to merge contiguous sections in the DECB output file to avoid the explosion of preambles
lost
parents:
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115 { |
|
302b8db5fd89
modified lwlink to merge contiguous sections in the DECB output file to avoid the explosion of preambles
lost
parents:
139
diff
changeset
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116 if (sectlist[sn].ptr -> flags & SECTION_BSS) |
|
302b8db5fd89
modified lwlink to merge contiguous sections in the DECB output file to avoid the explosion of preambles
lost
parents:
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diff
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117 continue; |
|
302b8db5fd89
modified lwlink to merge contiguous sections in the DECB output file to avoid the explosion of preambles
lost
parents:
139
diff
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118 if (sectlist[sn].ptr -> codesize == 0) |
|
302b8db5fd89
modified lwlink to merge contiguous sections in the DECB output file to avoid the explosion of preambles
lost
parents:
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119 continue; |
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302b8db5fd89
modified lwlink to merge contiguous sections in the DECB output file to avoid the explosion of preambles
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parents:
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120 writebytes(sectlist[sn].ptr -> code, 1, sectlist[sn].ptr -> codesize, of); |
|
302b8db5fd89
modified lwlink to merge contiguous sections in the DECB output file to avoid the explosion of preambles
lost
parents:
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121 } |
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modified lwlink to merge contiguous sections in the DECB output file to avoid the explosion of preambles
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122 sn--; |
| 121 | 123 } |
| 124 // write a postamble | |
| 125 buf[0] = 0xff; | |
| 126 buf[1] = 0x00; | |
| 127 buf[2] = 0x00; | |
| 128 buf[3] = linkscript.execaddr >> 8; | |
| 129 buf[4] = linkscript.execaddr & 0xff; | |
| 130 writebytes(buf, 1, 5, of); | |
| 131 } | |
| 132 | |
| 133 void do_output_raw(FILE *of) | |
| 134 { | |
| 123 | 135 int nskips = 0; // used to output blanks for BSS inline |
| 136 int sn; | |
| 137 | |
| 138 for (sn = 0; sn < nsects; sn++) | |
| 139 { | |
| 140 if (sectlist[sn].ptr -> flags & SECTION_BSS) | |
| 141 { | |
| 142 // no output for a BSS section | |
| 143 nskips += sectlist[sn].ptr -> codesize; | |
| 144 continue; | |
| 145 } | |
| 146 while (nskips > 0) | |
| 147 { | |
| 148 // the "" is not an error - it turns into a single NUL byte! | |
| 149 writebytes("", 1, 1, of); | |
| 150 nskips--; | |
| 151 } | |
| 152 writebytes(sectlist[sn].ptr -> code, 1, sectlist[sn].ptr -> codesize, of); | |
| 153 } | |
| 121 | 154 } |