S-Record handling
DESCRIPTION
-
+
Ordinary S-Records cannot hold anything but addresses and
data, so that's all that we implement.
up and output them when it's time to close the bfd.
An s record looks like:
-
+
EXAMPLE
S<type><length><address><data><checksum>
-
+
DESCRIPTION
Where
o length
7) four byte address termination record
8) three byte address termination record
9) two byte address termination record
-
+
o address
is the start address of the data following, or in the case of
a termination record, the start address of the image
is the sum of all the raw byte data in the record, from the length
upwards, modulo 256 and subtracted from 255.
-
SUBSECTION
Symbol S-Record handling
DESCRIPTION
We allow symbols to be anywhere in the data stream - the module names
are always ignored.
-
+
*/
#include "bfd.h"
/* The maximum number of bytes on a line is FF. */
#define MAXCHUNK 0xff
-/* The number of bytes we fit onto a line on output. */
-#define CHUNK 16
+
+/* Default size for a CHUNK. */
+#define DEFAULT_CHUNK 16
+
+/* The number of bytes we actually fit onto a line on output.
+ This variable can be modified by objcopy's --srec-len parameter.
+ For a 0x75 byte record you should set --srec-len=0x70. */
+unsigned int Chunk = DEFAULT_CHUNK;
+
+/* The type of srec output (free or forced to S3).
+ This variable can be modified by objcopy's --srec-forceS3
+ parameter. */
+boolean S3Forced = 0;
/* When writing an S-record file, the S-records can not be output as
they are seen. This structure is used to hold them in memory. */
return false;
memcpy ((PTR) data, location, (size_t) bytes_to_do);
- if ((section->lma + offset + bytes_to_do - 1) <= 0xffff)
- {
-
- }
+ /* Ff S3Forced is true then always select S3 records,
+ regardless of the siez of the addresses. */
+ if (S3Forced)
+ tdata->type = 3;
+ else if ((section->lma + offset + bytes_to_do - 1) <= 0xffff)
+ ; /* The default, S1, is OK. */
else if ((section->lma + offset + bytes_to_do - 1) <= 0xffffff
&& tdata->type <= 2)
- {
- tdata->type = 2;
- }
+ tdata->type = 2;
else
- {
- tdata->type = 3;
- }
+ tdata->type = 3;
entry->data = data;
entry->where = section->lma + offset;
bfd_vma address;
unsigned int octets_this_chunk = list->size - octets_written;
- if (octets_this_chunk > CHUNK)
- octets_this_chunk = CHUNK;
+ if (octets_this_chunk > Chunk)
+ octets_this_chunk = Chunk;
address = list->where + octets_written / bfd_octets_per_byte (abfd);