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annotate src/output.c @ 74:c8c772ef5df9
Checkpointing object target implementation
| author | lost |
|---|---|
| date | Thu, 08 Jan 2009 01:18:40 +0000 |
| parents | 6de358e7903f |
| children | 918be0c02239 |
| rev | line source |
|---|---|
| 0 | 1 /* |
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2 output.c |
| 46 | 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 */ |
| 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 | |
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38 // this prevents warnings about not using the return value of fwrite() |
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39 #define writebytes(s, l, c, f) do { int r; r = fwrite((s), (l), (c), (f)); } while (0) |
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40 |
| 46 | 41 void lwasm_output(asmstate_t *as) |
| 0 | 42 { |
| 43 FILE *of; | |
| 44 | |
| 45 if (as -> errorcount > 0) | |
| 46 { | |
| 47 fprintf(stderr, "Not doing output due to assembly errors.\n"); | |
| 48 return; | |
| 49 } | |
| 50 | |
| 51 of = fopen(as -> outfile, "wb"); | |
| 52 if (!of) | |
| 53 { | |
| 54 fprintf(stderr, "Cannot open '%s' for output", as -> outfile); | |
| 55 perror(""); | |
| 56 return; | |
| 57 } | |
| 58 | |
| 59 switch (as -> outformat) | |
| 60 { | |
| 61 case OUTPUT_RAW: | |
| 62 write_code_raw(as, of); | |
| 63 break; | |
| 64 | |
| 65 case OUTPUT_DECB: | |
| 66 write_code_decb(as, of); | |
| 67 break; | |
| 68 | |
| 69 case OUTPUT_RAWREL: | |
| 70 write_code_rawrel(as, of); | |
| 71 break; | |
| 72 | |
| 73 default: | |
| 74 fprintf(stderr, "BUG: unrecognized output format when generating output file\n"); | |
| 75 fclose(of); | |
| 76 unlink(as -> outfile); | |
| 77 return; | |
| 78 } | |
| 79 | |
| 80 fclose(of); | |
| 81 } | |
| 82 | |
| 83 /* | |
| 84 rawrel output treats an ORG directive as an offset from the start of the | |
| 85 file. Undefined results will occur if an ORG directive moves the output | |
| 86 pointer backward. This particular implementation uses "fseek" to handle | |
| 87 ORG requests and to skip over RMBs. | |
| 88 | |
| 89 This simple brain damanged method simply does an fseek before outputting | |
| 90 each instruction. | |
| 91 */ | |
| 92 void write_code_rawrel(asmstate_t *as, FILE *of) | |
| 93 { | |
| 46 | 94 lwasm_line_t *cl; |
| 0 | 95 |
| 46 | 96 for (cl = as -> lineshead; cl; cl = cl -> next) |
| 0 | 97 { |
| 46 | 98 if (cl -> codelen == 0) |
| 0 | 99 continue; |
| 100 | |
| 46 | 101 fseek(of, cl -> codeaddr, SEEK_SET); |
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102 writebytes(cl -> bytes, cl -> codelen, 1, of); |
| 0 | 103 } |
| 104 } | |
| 105 | |
| 106 /* | |
| 107 raw merely writes all the bytes directly to the file as is. ORG is just a | |
| 108 reference for the assembler to handle absolute references. Multiple ORG | |
| 109 statements will produce mostly useless results | |
| 110 */ | |
| 111 void write_code_raw(asmstate_t *as, FILE *of) | |
| 112 { | |
| 46 | 113 lwasm_line_t *cl; |
| 0 | 114 |
| 46 | 115 for (cl = as -> lineshead; cl; cl = cl -> next) |
| 0 | 116 { |
| 46 | 117 if (cl -> nocodelen) |
| 0 | 118 { |
| 119 int i; | |
| 46 | 120 for (i = 0; i < cl -> nocodelen; i++) |
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121 writebytes("\0", 1, 1, of); |
| 0 | 122 continue; |
| 123 } | |
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124 writebytes(cl -> bytes, cl -> codelen, 1, of); |
| 0 | 125 } |
| 126 } | |
| 127 | |
| 128 void write_code_decb(asmstate_t *as, FILE *of) | |
| 129 { | |
| 130 long preambloc; | |
| 46 | 131 lwasm_line_t *cl; |
| 0 | 132 int blocklen = -1; |
| 133 int nextcalc = -1; | |
| 134 unsigned char outbuf[5]; | |
| 135 | |
| 46 | 136 for (cl = as -> lineshead; cl; cl = cl -> next) |
| 0 | 137 { |
| 46 | 138 if (cl -> nocodelen) |
| 0 | 139 continue; |
| 46 | 140 if (cl -> codeaddr != nextcalc && cl -> codelen > 0) |
| 0 | 141 { |
| 142 // need preamble here | |
| 143 if (blocklen > 0) | |
| 144 { | |
| 46 | 145 // update previous preamble if needed |
| 0 | 146 fseek(of, preambloc, SEEK_SET); |
| 147 outbuf[0] = (blocklen >> 8) & 0xFF; | |
| 148 outbuf[1] = blocklen & 0xFF; | |
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149 writebytes(outbuf, 2, 1, of); |
| 0 | 150 fseek(of, 0, SEEK_END); |
| 151 } | |
| 152 blocklen = 0; | |
| 46 | 153 nextcalc = cl -> codeaddr; |
| 0 | 154 outbuf[0] = 0x00; |
| 155 outbuf[1] = 0x00; | |
| 156 outbuf[2] = 0x00; | |
| 157 outbuf[3] = (nextcalc >> 8) & 0xFF; | |
| 158 outbuf[4] = nextcalc & 0xFF; | |
| 159 preambloc = ftell(of) + 1; | |
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160 writebytes(outbuf, 5, 1, of); |
| 0 | 161 } |
| 46 | 162 nextcalc += cl -> codelen; |
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163 writebytes(cl -> bytes, cl -> codelen, 1, of); |
| 46 | 164 blocklen += cl -> codelen; |
| 0 | 165 } |
| 166 if (blocklen > 0) | |
| 167 { | |
| 168 fseek(of, preambloc, SEEK_SET); | |
| 169 outbuf[0] = (blocklen >> 8) & 0xFF; | |
| 170 outbuf[1] = blocklen & 0xFF; | |
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171 writebytes(outbuf, 2, 1, of); |
| 0 | 172 fseek(of, 0, SEEK_END); |
| 173 } | |
| 174 | |
| 175 // now write postamble | |
| 176 outbuf[0] = 0xFF; | |
| 177 outbuf[1] = 0x00; | |
| 178 outbuf[2] = 0x00; | |
| 179 outbuf[3] = (as -> execaddr >> 8) & 0xFF; | |
| 180 outbuf[4] = (as -> execaddr) & 0xFF; | |
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181 writebytes(outbuf, 5, 1, of); |
| 0 | 182 } |