git.gag.com Git - fw/sdcc/blob - as/link/mcs51/lks19.c

   1 /* lks19.c */
   2
   3 /*
   4  * (C) Copyright 1989-1995
   5  * All Rights Reserved
   6  *
   7  * Alan R. Baldwin
   8  * 721 Berkeley St.
   9  * Kent, Ohio  44240
  10  */
  11
  12 #include <stdio.h>
  13 #include <string.h>
  14 #include "aslink.h"
  15
  16 /*)Module       lks19.c
  17  *
  18  *      The module lks19.c contains the function to
  19  *      output the relocated object code in the
  20  *      Motorola S19 format.
  21  *
  22  *      lks19.c contains the following function:
  23  *              VOID    s19(i)
  24  *
  25  *      lks19.c contains no local variables.
  26  */
  27
  28 /*)S19 Format
  29  *      Record Type Field    -  This  field  signifies  the  start  of a
  30  *                              record and  identifies  the  the  record
  31  *                              type as follows:
  32  *
  33  *                                  Ascii S1 - Data Record
  34  *                                  Ascii S9 - End of File Record
  35  *
  36  *      Record Length Field  -  This  field  specifies the record length
  37  *                              which includes the  address,  data,  and
  38  *                              checksum   fields.   The  8  bit  record
  39  *                              length value is converted to  two  ascii
  40  *                              characters, high digit first.
  41  *
  42  *      Load Address Field   -  This  field  consists  of the four ascii
  43  *                              characters which result from  converting
  44  *                              the  the  binary value of the address in
  45  *                              which to begin loading this record.  The
  46  *                              order is as follows:
  47  *
  48  *                                  High digit of high byte of address.
  49  *                                  Low digit of high byte of address.
  50  *                                  High digit of low byte of address.
  51  *                                  Low digit of low byte of address.
  52  *
  53  *                              In an End of File record this field con-
  54  *                              sists of either four ascii zeros or  the
  55  *                              program  entry  address.   Currently the
  56  *                              entry address option is not supported.
  57  *
  58  *      Data Field           -  This  field consists of the actual data,
  59  *                              converted to two ascii characters,  high
  60  *                              digit first.  There are no data bytes in
  61  *                              the End of File record.
  62  *
  63  *      Checksum Field       -  The  checksum  field is the 8 bit binary
  64  *                              sum of the record length field, the load
  65  *                              address field, and the data field.  This
  66  *                              sum is then  complemented  (1's  comple-
  67  *                              ment)   and   converted   to  two  ascii
  68  *                              characters, high digit first.
  69  */
  70
  71 /*)Function     s19(i)
  72  *
  73  *              int     i               0 - process data
  74  *                                      1 - end of data
  75  *
  76  *      The function s19() outputs the relocated data
  77  *      in the standard Motorola S19 format.
  78  *
  79  *      local variables:
  80  *              Addr_T  chksum          byte checksum
  81  *
  82  *      global variables:
  83  *              int     hilo            byte order
  84  *              FILE *  ofp             output file handle
  85  *              int     rtcnt           count of data words
  86  *              int     rtflg[]         output the data flag
  87  *              Addr_T  rtval[]         relocated data
  88  *
  89  *      functions called:
  90  *              int     fprintf()       c_library
  91  *
  92  *      side effects:
  93  *              The data is output to the file defined by ofp.
  94  */
  95
  96 VOID
  97 s19(i)
  98 {
  99         register Addr_T chksum;
 100
 101         if (i) {
 102                 if (hilo == 0) {
 103                         chksum = rtval[0];
 104                         rtval[0] = rtval[1];
 105                         rtval[1] = chksum;
 106                 }
 107                 for (i = 0, chksum = 1; i < rtcnt; i++) {
 108                         if (rtflg[i])
 109                                 chksum++;
 110                 }
 111                 fprintf(ofp, "S1%02X", chksum);
 112                 for (i = 0; i < rtcnt ; i++) {
 113                         if (rtflg[i]) {
 114                                 fprintf(ofp, "%02X", rtval[i]);
 115                                 chksum += rtval[i];
 116                         }
 117                 }
 118                 fprintf(ofp, "%02X\n", (0-chksum-1) & 0xff);
 119         } else {
 120                 fprintf(ofp, "S9030000FC\n");
 121         }
 122 }