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   1 /* lks19.c
   2
   3    Copyright (C) 1989-1995 Alan R. Baldwin
   4    721 Berkeley St., Kent, Ohio 44240
   5
   6 This program is free software; you can redistribute it and/or modify it
   7 under the terms of the GNU General Public License as published by the
   8 Free Software Foundation; either version 3, or (at your option) any
   9 later version.
  10
  11 This program is distributed in the hope that it will be useful,
  12 but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 GNU General Public License for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with this program.  If not, see <http://www.gnu.org/licenses/>. */
  18
  19 #include <stdio.h>
  20 #include <string.h>
  21 #include "aslink.h"
  22
  23 /*)Module       lks19.c
  24  *
  25  *      The module lks19.c contains the function to
  26  *      output the relocated object code in the
  27  *      Motorola S19 format.
  28  *
  29  *      lks19.c contains the following function:
  30  *              VOID    s19(i)
  31  *
  32  *      lks19.c contains no local variables.
  33  */
  34
  35 /*)S19 Format
  36  *      Record Type Field    -  This  field  signifies  the  start  of a
  37  *                              record and  identifies  the  the  record
  38  *                              type as follows:
  39  *
  40  *                                  Ascii S1 - Data Record
  41  *                                  Ascii S9 - End of File Record
  42  *
  43  *      Record Length Field  -  This  field  specifies the record length
  44  *                              which includes the  address,  data,  and
  45  *                              checksum   fields.   The  8  bit  record
  46  *                              length value is converted to  two  ascii
  47  *                              characters, high digit first.
  48  *
  49  *      Load Address Field   -  This  field  consists  of the four ascii
  50  *                              characters which result from  converting
  51  *                              the  the  binary value of the address in
  52  *                              which to begin loading this record.  The
  53  *                              order is as follows:
  54  *
  55  *                                  High digit of high byte of address.
  56  *                                  Low digit of high byte of address.
  57  *                                  High digit of low byte of address.
  58  *                                  Low digit of low byte of address.
  59  *
  60  *                              In an End of File record this field con-
  61  *                              sists of either four ascii zeros or  the
  62  *                              program  entry  address.   Currently the
  63  *                              entry address option is not supported.
  64  *
  65  *      Data Field           -  This  field consists of the actual data,
  66  *                              converted to two ascii characters,  high
  67  *                              digit first.  There are no data bytes in
  68  *                              the End of File record.
  69  *
  70  *      Checksum Field       -  The  checksum  field is the 8 bit binary
  71  *                              sum of the record length field, the load
  72  *                              address field, and the data field.  This
  73  *                              sum is then  complemented  (1's  comple-
  74  *                              ment)   and   converted   to  two  ascii
  75  *                              characters, high digit first.
  76  */
  77
  78 /*)Function     s19(i)
  79  *
  80  *              int     i               0 - process data
  81  *                                      1 - end of data
  82  *
  83  *      The function s19() outputs the relocated data
  84  *      in the standard Motorola S19 format.
  85  *
  86  *      local variables:
  87  *              Addr_T  chksum          byte checksum
  88  *
  89  *      global variables:
  90  *              int     hilo            byte order
  91  *              FILE *  ofp             output file handle
  92  *              int     rtcnt           count of data words
  93  *              int     rtflg[]         output the data flag
  94  *              Addr_T  rtval[]         relocated data
  95  *
  96  *      functions called:
  97  *              int     fprintf()       c_library
  98  *
  99  *      side effects:
 100  *              The data is output to the file defined by ofp.
 101  */
 102
 103 VOID
 104 s19(i)
 105 {
 106         register Addr_T chksum;
 107
 108         if (i) {
 109                 if (hilo == 0) {
 110                         chksum = rtval[0];
 111                         rtval[0] = rtval[1];
 112                         rtval[1] = chksum;
 113                 }
 114                 for (i = 0, chksum = 1; i < rtcnt; i++) {
 115                         if (rtflg[i])
 116                                 chksum++;
 117                 }
 118                 fprintf(ofp, "S1%02X", chksum);
 119                 for (i = 0; i < rtcnt ; i++) {
 120                         if (rtflg[i]) {
 121                                 fprintf(ofp, "%02X", rtval[i]);
 122                                 chksum += rtval[i];
 123                         }
 124                 }
 125                 fprintf(ofp, "%02X\n", (0-chksum-1) & 0xff);
 126         } else {
 127                 fprintf(ofp, "S9030000FC\n");
 128         }
 129 }