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/* lkihx.c
Copyright (C) 1989-1995 Alan R. Baldwin
721 Berkeley St., Kent, Ohio 44240
This program is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by the
Free Software Foundation; either version 3, or (at your option) any
later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include <stdio.h>
#include <string.h>
#include "sdld.h"
#include "aslink.h"
/*)Module lkihx.c
*
* The module lkihx.c contains the function to
* output the relocated object code in the
* Intel Hex format.
*
* lkihx.c contains the following functions:
* VOID hexRecord(addr, rtvalIndex)
* VOID ihx(i)
* VOID ihxExtendedLinearAddress(a)
*
* local variables: hexPageOverrun, lastHexAddr
*/
/*Intel Format
* Record Mark Field - This field signifies the start of a
* record, and consists of an ascii colon
* (:).
*
* Record Length Field - This field consists of two ascii
* characters which indicate the number of
* data bytes in this record. The
* characters are the result of converting
* the number of bytes in binary to two
* ascii characters, high digit first. An
* End of File record contains two ascii
* zeros in this field.
*
* Load Address Field - This field consists of the four ascii
* characters which result from converting
* the the binary value of the address in
* which to begin loading this record. The
* order is as follows:
*
* High digit of high byte of address.
* Low digit of high byte of address.
* High digit of low byte of address.
* Low digit of low byte of address.
*
* In an End of File record this field con-
* sists of four ascii zeros, in a start
* address record this is the program entry
* address (low), or in a segment record
* this is the high order address.
*
* Record Type Field - This field identifies the record type,
* which is either 0 for data records, 1
* for an End of File record, 3 for a
* start address, or 4 for a
* segment record. It consists
* of two ascii characters, with the high
* digit of the record type first, followed
* by the low digit of the record type.
*
* Data Field - This field consists of the actual data,
* converted to two ascii characters, high
* digit first. There are no data bytes in
* the End of File record.
*
* Checksum Field - The checksum field is the 8 bit binary
* sum of the record length field, the load
* address field, the record type field,
* and the data field. This sum is then
* negated (2's complement) and converted
* to two ascii characters, high digit
* first.
*/
/* Static variable which holds the count of hex page overruns
* (crossings of the 64kB boundary). Cleared at explicit extended
* address output.
*/
static int hexPageOverrun = 0;
/* Global which holds the last (16 bit) address of hex record.
* Cleared at begin of new area or when the extended address is output.
*/
unsigned int lastHexAddr = 0;
/*)Function hexRecord(addr, rtvalIndex)
*
* unsigned addr starting address of hex record
* int rtvalIndex starting index into the rtval[] array
*
* The function hexRecord() outputs the relocated data
* in the standard Intel Hex format (with inserting
* the extended address record if necessary).
*
* local variables:
* a_uint chksum byte checksum
* int i index for loops
* int overrun temporary storage for hexPageOverrun
* int bytes counter for bytes written
*
* global variables:
* FILE * ofp output file handle
* int rtcnt count of data words
* int rtflg[] output the data flag
* a_uint rtval[] relocated data
*
* functions called:
* int fprintf() c_library
* ihxExtendedLinearAddress() lkihx.c
* hexRecord() lkihx.c (recursion)
*
* side effects:
* hexPageOverrun is eventually incremented,
* lastHexAddr is updated
*/
VOID
hexRecord(unsigned addr, int rtvalIndex)
{
a_uint chksum;
int i, overrun, bytes;
for (i = rtvalIndex, chksum = 0; i < rtcnt; i++) {
if (rtflg[i]) {
if (addr + ++chksum > 0xffff)
break;
}
}
if (chksum == 0)
return; // nothing to output
/* Is this record in the same bank as previous? */
if ((TARGET_IS_8051 && ((lastHexAddr>>16) != (addr>>16)) && (rflag)) ||
(TARGET_IS_6808 && lastHexAddr > addr)) {
overrun = hexPageOverrun + 1;
ihxExtendedLinearAddress(lastExtendedAddress + overrun);
hexPageOverrun = overrun;
hexRecord(addr, rtvalIndex);
return;
}
lastHexAddr = addr;
fprintf(ofp, ":%02X%04X00", chksum, addr);
chksum += (addr >> 8) + (addr & 0xff);
for (i = rtvalIndex, bytes = 0; i < rtcnt; i++) {
if (rtflg[i]) {
fprintf(ofp, "%02X", rtval[i]);
chksum += rtval[i];
if (TARGET_IS_8051) {
if (addr + ++bytes > 0xffff) {
if (rflag) {
fprintf(ofp, "%02X\n", (0-chksum) & 0xff);
overrun = hexPageOverrun + 1;
ihxExtendedLinearAddress(lastExtendedAddress + overrun);
hexPageOverrun = overrun;
hexRecord(0, i + 1);
return;
} else {
fprintf(stderr,
"warning: extended linear address encountered; "
"you probably want the -r flag.\n");
}
}
}
}
}
fprintf(ofp, "%02X\n", (0-chksum) & 0xff);
}
/*)Function ihx(i)
*
* int i 0 - process data
* 1 - end of data
*
* The function ihx() calls the hexRecord() function for processing data
* or writes the End of Data record to the file defined by ofp.
*
* local variables:
* a_uint n auxiliary variable
*
* global variables:
* int hilo byte order
* FILE * ofp output file handle
* a_uint rtval[] relocated data
*
* functions called:
* VOID hexRecord() lkihx.c
* int fprintf() c_library
*
* side effects:
* The sequence of rtval[0], rtval[1] is eventually changed.
*/
VOID
ihx(int i)
{
a_uint n;
if (i) {
if (TARGET_IS_6808 && ap->a_flag & A_NOLOAD)
return;
if (hilo == 0) {
n = rtval[0];
rtval[0] = rtval[1];
rtval[1] = n;
}
hexRecord((rtval[0]<<8) + rtval[1], 2);
} else {
if (TARGET_IS_8051 && rflag) /* linear start address, hardcoded as reset vector (0x0000) */
fprintf(ofp, ":0400000500000000F7\n");
fprintf(ofp, ":00000001FF\n");
}
}
/*)Function ihxNewArea(i)
* The function ihxNewArea() is called when processing of new area is started.
* It resets the value of lastHexAddr.
*/
VOID
ihxNewArea()
{
lastHexAddr = 0;
}
/*)Function ihxExtendedLinearAddress(i)
*
* a_uint i 16 bit extended linear address.
*
* The function ihxExtendedLinearAddress() writes an extended
* linear address record (type 04) to the output file.
*
* local variables:
* a_uint chksum byte checksum
*
* global variables:
* FILE * ofp output file handle
*
* functions called:
* int fprintf() c_library
*
* side effects:
* The data is output to the file defined by ofp.
* hexPageOverrun and lastHexAddr is cleared
*/
VOID
ihxExtendedLinearAddress(a_uint a)
{
a_uint chksum;
/* The checksum is the complement of the bytes in the
* record: the 2 is record length, 4 is the extended linear
* address record type, plus the two address bytes.
*/
chksum = 2 + 4 + (a & 0xff) + ((a >> 8) & 0xff);
fprintf(ofp, ":02000004%04X%02X\n", a & 0xffff, (0-chksum) & 0xff);
hexPageOverrun = 0;
lastHexAddr = 0;
}
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