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annotate src/output.c @ 7:7e50d576470d 1.0 1.0 1.1
Added build system files
| author | lost |
|---|---|
| date | Sat, 04 Oct 2008 03:26:25 +0000 |
| parents | 34568fab6058 |
| children | b962cee20bf4 |
| rev | line source |
|---|---|
| 0 | 1 /* |
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34568fab6058
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2 output.c |
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3 Copyright © 2008 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 */ |
| 0 | 23 |
| 24 //#include <ctype.h> | |
| 25 #include <errno.h> | |
| 26 #include <stdio.h> | |
| 27 //#include <stdlib.h> | |
| 28 #include <string.h> | |
| 29 #include <unistd.h> | |
| 30 #define __output_c_seen__ | |
| 31 //#include "instab.h" | |
| 32 #include "lwasm.h" | |
| 33 | |
| 34 void write_code_raw(asmstate_t *as, FILE *of); | |
| 35 void write_code_decb(asmstate_t *as, FILE *of); | |
| 36 void write_code_rawrel(asmstate_t *as, FILE *of); | |
| 37 | |
| 38 void write_code(asmstate_t *as) | |
| 39 { | |
| 40 FILE *of; | |
| 41 | |
| 42 if (as -> errorcount > 0) | |
| 43 { | |
| 44 fprintf(stderr, "Not doing output due to assembly errors.\n"); | |
| 45 return; | |
| 46 } | |
| 47 | |
| 48 of = fopen(as -> outfile, "wb"); | |
| 49 if (!of) | |
| 50 { | |
| 51 fprintf(stderr, "Cannot open '%s' for output", as -> outfile); | |
| 52 perror(""); | |
| 53 return; | |
| 54 } | |
| 55 | |
| 56 switch (as -> outformat) | |
| 57 { | |
| 58 case OUTPUT_RAW: | |
| 59 write_code_raw(as, of); | |
| 60 break; | |
| 61 | |
| 62 case OUTPUT_DECB: | |
| 63 write_code_decb(as, of); | |
| 64 break; | |
| 65 | |
| 66 case OUTPUT_RAWREL: | |
| 67 write_code_rawrel(as, of); | |
| 68 break; | |
| 69 | |
| 70 default: | |
| 71 fprintf(stderr, "BUG: unrecognized output format when generating output file\n"); | |
| 72 fclose(of); | |
| 73 unlink(as -> outfile); | |
| 74 return; | |
| 75 } | |
| 76 | |
| 77 fclose(of); | |
| 78 } | |
| 79 | |
| 80 /* | |
| 81 rawrel output treats an ORG directive as an offset from the start of the | |
| 82 file. Undefined results will occur if an ORG directive moves the output | |
| 83 pointer backward. This particular implementation uses "fseek" to handle | |
| 84 ORG requests and to skip over RMBs. | |
| 85 | |
| 86 This simple brain damanged method simply does an fseek before outputting | |
| 87 each instruction. | |
| 88 */ | |
| 89 void write_code_rawrel(asmstate_t *as, FILE *of) | |
| 90 { | |
| 91 sourceline_t *cl; | |
| 92 | |
| 93 for (cl = as -> source_head; cl; cl = cl -> next) | |
| 94 { | |
| 95 if (cl -> nocode) | |
| 96 continue; | |
| 97 | |
| 98 fseek(of, cl -> addr, SEEK_SET); | |
| 99 fwrite(cl -> codebytes, cl -> numcodebytes, 1, of); | |
| 100 } | |
| 101 } | |
| 102 | |
| 103 /* | |
| 104 raw merely writes all the bytes directly to the file as is. ORG is just a | |
| 105 reference for the assembler to handle absolute references. Multiple ORG | |
| 106 statements will produce mostly useless results | |
| 107 */ | |
| 108 void write_code_raw(asmstate_t *as, FILE *of) | |
| 109 { | |
| 110 sourceline_t *cl; | |
| 111 | |
| 112 for (cl = as -> source_head; cl; cl = cl -> next) | |
| 113 { | |
| 114 if (cl -> nocode && cl -> len > 0) | |
| 115 { | |
| 116 int i; | |
| 117 for (i = 0; i < cl -> len; i++) | |
| 118 fwrite("\0", 1, 1, of); | |
| 119 continue; | |
| 120 } | |
| 121 if (cl -> nocode) | |
| 122 continue; | |
| 123 | |
| 124 fwrite(cl -> codebytes, cl -> numcodebytes, 1, of); | |
| 125 } | |
| 126 } | |
| 127 | |
| 128 void write_code_decb(asmstate_t *as, FILE *of) | |
| 129 { | |
| 130 long preambloc; | |
| 131 sourceline_t *cl; | |
| 132 int blocklen = -1; | |
| 133 int nextcalc = -1; | |
| 134 unsigned char outbuf[5]; | |
| 135 | |
| 136 for (cl = as -> source_head; cl; cl = cl -> next) | |
| 137 { | |
| 138 if (cl -> nocode) | |
| 139 continue; | |
| 140 if (cl -> addr != nextcalc && cl -> numcodebytes > 0) | |
| 141 { | |
| 142 // need preamble here | |
| 143 if (blocklen > 0) | |
| 144 { | |
| 145 fseek(of, preambloc, SEEK_SET); | |
| 146 outbuf[0] = (blocklen >> 8) & 0xFF; | |
| 147 outbuf[1] = blocklen & 0xFF; | |
| 148 fwrite(outbuf, 2, 1, of); | |
| 149 fseek(of, 0, SEEK_END); | |
| 150 } | |
| 151 blocklen = 0; | |
| 152 nextcalc = cl -> addr; | |
| 153 outbuf[0] = 0x00; | |
| 154 outbuf[1] = 0x00; | |
| 155 outbuf[2] = 0x00; | |
| 156 outbuf[3] = (nextcalc >> 8) & 0xFF; | |
| 157 outbuf[4] = nextcalc & 0xFF; | |
| 158 preambloc = ftell(of) + 1; | |
| 159 fwrite(outbuf, 5, 1, of); | |
| 160 } | |
| 161 nextcalc += cl -> numcodebytes; | |
| 162 fwrite(cl -> codebytes, cl -> numcodebytes, 1, of); | |
| 163 blocklen += cl -> numcodebytes; | |
| 164 } | |
| 165 if (blocklen > 0) | |
| 166 { | |
| 167 fseek(of, preambloc, SEEK_SET); | |
| 168 outbuf[0] = (blocklen >> 8) & 0xFF; | |
| 169 outbuf[1] = blocklen & 0xFF; | |
| 170 fwrite(outbuf, 2, 1, of); | |
| 171 fseek(of, 0, SEEK_END); | |
| 172 } | |
| 173 | |
| 174 // now write postamble | |
| 175 outbuf[0] = 0xFF; | |
| 176 outbuf[1] = 0x00; | |
| 177 outbuf[2] = 0x00; | |
| 178 outbuf[3] = (as -> execaddr >> 8) & 0xFF; | |
| 179 outbuf[4] = (as -> execaddr) & 0xFF; | |
| 180 fwrite(outbuf, 5, 1, of); | |
| 181 } |