| 1 | /OVRDRV - OVERLAY DRIVER FOR CCL |
| 2 | / |
| 3 | / |
| 4 | / |
| 5 | / |
| 6 | / |
| 7 | / |
| 8 | / |
| 9 | / |
| 10 | / |
| 11 | /COPYRIGHT (C) 1977,1978 BY DIGITAL EQUIPMENT CORPORATION |
| 12 | / |
| 13 | / |
| 14 | / |
| 15 | / |
| 16 | / |
| 17 | / |
| 18 | / |
| 19 | / |
| 20 | / |
| 21 | / |
| 22 | /THE INFORMATION IN THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE |
| 23 | /AND SHOULD NOT BE CONSTRUED AS A COMMITMENT BY DIGITAL EQUIPMENT |
| 24 | /CORPORATION. DIGITAL EQUIPMENT CORPORATION ASSUMES NO RESPONSIBILITY |
| 25 | /FOR ANY ERRORS THAT MAY APPEAR IN THIS DOCUMENT. |
| 26 | / |
| 27 | /THE SOFTWARE DESCRIBED IN THIS DOCUMENT IS FURNISHED TO THE PURCHASER |
| 28 | /UNDER A LICENSE FOR USE ON A SINGLE COMPUTER SYSTEM AND CAN BE COPIED |
| 29 | /(WITH INCLUSION OF DIGITAL'S COPYRIGHT NOTICE) ONLY FOR USE IN SUCH |
| 30 | /SYSTEM, EXCEPT AS MAY OTHERWISE BE PROVIDED IN WRITING BY DIGITAL. |
| 31 | / |
| 32 | /DIGITAL EQUIPMENT CORPORATION ASSUMES NO RESPONSIBILITY FOR THE USE |
| 33 | /OR RELIABILITY OF ITS SOFTWARE ON EQUIPMENT THAT IS NOT SUPPLIED BY |
| 34 | /DIGITAL. |
| 35 | / |
| 36 | / |
| 37 | / |
| 38 | / |
| 39 | / |
| 40 | / |
| 41 | / |
| 42 | / |
| 43 | / |
| 44 | / |
| 45 | \f |
| 46 | /OVERLAY DRIVER |
| 47 | /FOR LINKER PROGRAM MODULES |
| 48 | /VERSION=V3A |
| 49 | |
| 50 | |
| 51 | /THIS SECT IS TWO LOCATIONS AND CONTAINS THE TRANSFER VECTOR TO SWAPER |
| 52 | /AND A FLAG THAT INDICATES WHETHER A JMP (1) OR JMS (0) WAS PERFORMED |
| 53 | /TO THE TRANSFER VECTOR |
| 54 | |
| 55 | / .SECT XFERV,Z |
| 56 | / 0 /FLAG, 1=JMP, 0=JMS |
| 57 | / SWAPER /TRANSFER VECTOR TO SWAP ROUTINE |
| 58 | |
| 59 | /THIS IS THE MAIN DRIVER SECTION |
| 60 | |
| 61 | .SECT SWAPER,R |
| 62 | .GLOBAL SWPTAB,TRANVC |
| 63 | |
| 64 | .ZTERNAL XFERV |
| 65 | FIELD 1 |
| 66 | |
| 67 | SWAP, 6102 /VERSION NUMBER |
| 68 | DCA AC /SAVE CALLING AC |
| 69 | RAL |
| 70 | DCA LINK /AND LINK |
| 71 | RDF /GET CALLING DF |
| 72 | TAD (CDF /FORM CDF |
| 73 | SWAP0, JMP ONCE /DO ONCE ONLY CODE - REPLACED BY DCA EXIT |
| 74 | CDF . /CHANGE TO THIS DATA FIELD |
| 75 | TAD I SWAP /GET OVERLAY,LEVEL,FIELD |
| 76 | DCA BINDAT /SAVE |
| 77 | ISZ SWAP /BUMP POINTER |
| 78 | TAD I SWAP /GET SUBROUTINE ADDRESS |
| 79 | DCA XITLOC /SAVE |
| 80 | TAD BINDAT /FORM CDF TO CALLED SUBROUTINE |
| 81 | AND (7 |
| 82 | RAL CLL |
| 83 | RTL |
| 84 | TAD (CDF |
| 85 | DCA SWAP1A /SAVE |
| 86 | TAD SWAP1A /FORM CIF TO CALLED SUBROUTINE |
| 87 | IAC |
| 88 | DCA EXIT+1 /SAVE FOR EXIT |
| 89 | \f/LOAD OVERLAY OF CALLED SUBROUTINE |
| 90 | |
| 91 | LOAD, TAD BINDAT |
| 92 | AND (1600 /EXTRACT LEVEL OF CALLED SUBROUTINE |
| 93 | RTR CLL /5 RIGHT |
| 94 | RTR |
| 95 | RAR |
| 96 | DCA PNTR /SAVE |
| 97 | TAD PNTR |
| 98 | TAD (SWPTAB /COMPUTE ENTRY INTO SWAP TABLE |
| 99 | DCA FLD /POINTS TO FIELD OF OVERLAY |
| 100 | TAD PNTR /COMPUTE ENTRY INTO CURRENT OVERLAY TABLE |
| 101 | RTR CLL |
| 102 | TAD (CURTAB |
| 103 | DCA PNTR |
| 104 | TAD BINDAT /EXTRACT DESIRED OVERLAY NUMBER |
| 105 | AND (170 |
| 106 | RTR CLL /RIGHT 3 |
| 107 | RAR |
| 108 | CIA /NEGATE |
| 109 | DCA TEMP |
| 110 | TAD TEMP |
| 111 | TAD I PNTR /COMPARE WITH CURRENT OVERLAY NUMBER FOR LEVEL |
| 112 | SNA CLA /SAME? |
| 113 | JMP SWAP1 /YES, NO READING NEEDED |
| 114 | LOAD1, TAD TEMP /NO, SET TO NEW |
| 115 | CIA |
| 116 | DCA I PNTR /OVERLAY NUMBER |
| 117 | TAD FLD /SET UP POINTERS TO |
| 118 | IAC |
| 119 | DCA ADDRES /ADDRESS |
| 120 | TAD ADDRES |
| 121 | IAC |
| 122 | DCA RELBLK /RELATIVE BLOCK NUMBER |
| 123 | TAD RELBLK |
| 124 | IAC |
| 125 | DCA LENGTH /LENGTH OF OVERLAY |
| 126 | TAD TEMP /TEST OVERLAY NUMBER |
| 127 | SNA CLA /0? |
| 128 | JMP LOAD2 /YES, NO MULTIPLICATION NEEDED |
| 129 | TAD I LENGTH /BLOCK NUMBER = (LENGTH OF OVERLAY) |
| 130 | JMP I .+1 /TIMES (THE NUMBER OF THE OVERLAY) |
| 131 | PATCH |
| 132 | LOAD2, TAD I RELBLK /PLUS (RELATIVE BLOCK OF LEVEL) |
| 133 | TAD STRBLK /PLUS (STARTING BLOCK OF PROGRAM) |
| 134 | DCA REDBLK /SAVE IN CALL LOCATION |
| 135 | TAD I ADDRES /GET ADDRESS TO LOAD |
| 136 | DCA REDADD /SAVE IN CALL LOCATION |
| 137 | TAD I FLD /GET FIELD |
| 138 | AND (7 /MASK |
| 139 | RTR CLL |
| 140 | RAR /POSITION |
| 141 | \f TAD I LENGTH /GET LENGTH |
| 142 | RTL |
| 143 | RTL |
| 144 | RTL |
| 145 | DCA REDCNT /FORM CONTROL WORD |
| 146 | CIF 0 |
| 147 | JMS I (7607 /CALL SYSTEM HANDLER TO READ IN OVERLAY |
| 148 | REDCNT, 7756 /FUNCTION CONTROL WORD (POINTS TO MREAD-1 FOR "ONCE" |
| 149 | REDADD, -7607 /BUFFER ADDRESS (CONTAINS SYS: ENTRY POINT FOR "ONCE" |
| 150 | REDBLK, 0 /STARTING BLOCK NUMBER |
| 151 | HLT /ERROR RETURN ADDRESS |
| 152 | |
| 153 | SWAP1, TAD XFERV /GET JMP-JMS FLAG |
| 154 | SZA CLA /SET? |
| 155 | JMP SWAP2 /YES, EXECUTE A JMP |
| 156 | CLA CLL CMA RTL /-3 |
| 157 | TAD SWAP /BACK UP TO CALLER'S PC |
| 158 | DCA SWAP |
| 159 | TAD I SWAP |
| 160 | SWAP1A, 0 /CDF TO CALLED SUBROUTINE |
| 161 | DCA I XITLOC /SAVE IN CALLED SUBROUTINE |
| 162 | ISZ XITLOC /BUMP TRANSFER ADDRESS |
| 163 | CDF . |
| 164 | TAD (ISZ XFERV |
| 165 | DCA I SWAP /SET BACK UP ENTRY IN XFER VECTOR TABLE |
| 166 | SWAP2, DCA XFERV /CLEAR FLAG |
| 167 | TAD LINK /RESTORE LINK AND AC |
| 168 | RAR CLL |
| 169 | TAD AC |
| 170 | EXIT, 0 /SET DF TO CALLING FIELD |
| 171 | 0 /SET IF TO CALLED FIELD |
| 172 | JMP I XITLOC /GO TO CALLED SUBROUTINE |
| 173 | |
| 174 | \f/VARIABLE LOCATIONS |
| 175 | /SOME OF THE FOLLOWING LOCATIONS CONTAIN |
| 176 | /ONCE ONLY CODE TO SET UP STARTING BLOCK |
| 177 | /AND CHECK THAT FILE CAME FROM SYS: |
| 178 | CURTAB=. /CURRENT OVERLAY IN LEVEL TABLE (8 ENTRIES) |
| 179 | STRBLK=. /ENTRY 0 IS USED TO HOLD STARTING BLOCK OF FILE |
| 180 | ONCE, DCA EXIT /SAVE CALLING FIELD |
| 181 | /ALSO ENTRY 0 |
| 182 | TAD .-1 /SET UP SO WON'T BE EXECUTED AGAIN |
| 183 | /ALSO ENTRY 1 |
| 184 | DCA SWAP0 |
| 185 | /ALSO ENTRY 2 |
| 186 | CDF 0 |
| 187 | /ALSO ENTRY 3 |
| 188 | TAD I FLD /GET STARTING BLOCK FROM "SOFSET" |
| 189 | /ALSO ENTRY 4 |
| 190 | SNA |
| 191 | /ALSO ENTRY 5 |
| 192 | HLT /ERROR, K.M. PATCHES NOT IN |
| 193 | /ALSO ENTRY 6 |
| 194 | DCA STRBLK /SAVE |
| 195 | /ALSO ENTRY 7 |
| 196 | TAD I REDCNT /CHECK FILE CAME FROM SYS: |
| 197 | TAD REDADD |
| 198 | |
| 199 | BINDAT, /CONTAINS OVERLAY,LEVEL,FIELD OF DESIRED SUBROUTINE |
| 200 | SNA CLA /FROM SYS: ? |
| 201 | XITLOC, /CONTAINS LOCATION TO GO TO IN DESIRED SUBROUTINE |
| 202 | JMP SWAP0+1 /YES, OK |
| 203 | PNTR, /POINTS INTO CURTAB |
| 204 | HLT /NO, ERROR |
| 205 | TEMP, /TEMP STORAGE |
| 206 | JMP .-1 /DON'T ALLOW CONTINUE |
| 207 | FLD, /POINTS TO FIELD WORD IN SWPTAB |
| 208 | 7747 /POINTER TO "SOFSET" |
| 209 | |
| 210 | ADDRES=REDADD /POINTS TO ADDRESS WORD IN SWPTAB |
| 211 | RELBLK=REDBLK /POINTS TO RELATIVE BLOCK WORD IN SWPTAB |
| 212 | LENGTH=REDCNT /POINTS TO LENGTH WORD IN SWPTAB |
| 213 | |
| 214 | AC, 0 /SAVED AC |
| 215 | LINK, 0 /SAVED LINK |
| 216 | |
| 217 | PAGE |
| 218 | \f |
| 219 | /PATCH TO FIX BLOCK POSITION CALCULATION |
| 220 | PATCH, IAC /CONVERT PAGES TO BLOCKS |
| 221 | CLL RAR |
| 222 | DCA PTEMP |
| 223 | TAD PTEMP /MULTIPLY BLOCK LENGTH |
| 224 | ISZ I PPNT /BY OVERLAY NUMBER |
| 225 | JMP .-2 |
| 226 | JMP I .+1 |
| 227 | LOAD2 |
| 228 | PPNT, TEMP |
| 229 | PTEMP, 0 |
| 230 | |
| 231 | |
| 232 | |
| 233 | /THIS AREA CONTAINS OVERLAY DATA FOR MAIN AND THE 7 LEVELS |
| 234 | /THE FORMAT OF EACH ENTRY IS: |
| 235 | /WORD1: FIELD OF LEVEL |
| 236 | /WORD2: ADDRESS OF LEVEL |
| 237 | /WORD3: RELATIVE BLOCK OF 1ST OVERLAY IN LEVEL |
| 238 | /WORD4: LENGTH OF THE LEVEL (ANY AND ALL OVERLAYS-EACH) |
| 239 | / (ALL OVERLAYS IN A LEVEL ARE THE SAME LENGTH) |
| 240 | |
| 241 | SWPTAB, |
| 242 | |
| 243 | *.+40 |
| 244 | |
| 245 | /THIS AREA CONTAINS THE TRANSFER VECTORS FOR EACH ENTRY POINT |
| 246 | /IN ALL THE OVERLAYS IN ALL THE LEVELS |
| 247 | /ITS SIZE SHOULD BE MODIFIED BY THE USER |
| 248 | /TO FIT THE MAXIMUM NUMBER OF TRANSFER VECTORS NEEDED |
| 249 | /EACH TRANSFER VECTOR OCCUPIES 4 LOCATIONS |
| 250 | /THE TABLE IS INITIALLY SET UP FOR 24(DEC) (30(OCT)) VECTORS |
| 251 | /THE MAXIMUM SIZE THIS TABLE CAN BE IS 3774 (OCT) LOCATIONS FOR |
| 252 | /511 (DEC) (777 (OCT)) VECTORS |
| 253 | /THE FORMAT OF EACH VECTOR ENTRY IS: |
| 254 | /WORD1: ISZ XFERV |
| 255 | /WORD2: JMS I XFERV+1 |
| 256 | /WORD3: LEVEL/OVERLAY/FIELD |
| 257 | /WORD4: ADDRESS |
| 258 | |
| 259 | TRANVC, |
| 260 | |
| 261 | SIZE=53. /MODIFY THIS LINE TO CHANGE THE SIZE OF THE TABLE |
| 262 | /SET FOR 24(DEC) |
| 263 | |
| 264 | *SIZE^4+. |
| 265 | |
| 266 | |
| 267 | \f |