Hello,
For an mcs51 target I'm using sdcc 2.6.0 now.
After linking a project the linker tells me that there is not enough
space in DATA memory. No problem, I just moved some symbols to XDATA.
While doing so I found that the linker is allocating lots of memory in
DATA just for functional parameters; here is an example:
/* this is the function prototype */
void HexByteToString(BYTE Value, char *String, BOOL Uppercase)
And this is the relevant contents of the map file:
Area Addr Size Decimal Bytes (Attributes)
-------------------------------- ---- ---- ------- ----- ------------
DSEG 0030 004B = 75. bytes (REL,CON)
Value Global
-------- --------------------------------
0030 LLCDWrite$n$1$1
0031 LLCDWrite$ch$1$1
0032 LLCDWrite$Pos$1$1
0033 LLCDWrite$byArgPrefix$1$1
0034 LLCDWrite$SignChar$1$1
0035 LLCDWrite$Width$1$1
0036 LLCDWrite$Precision$1$1
0037 LLCDWrite$CharVal$1$1
0038 LLCDWrite$byVal$1$1
0039 LLCDWrite$WordVal$1$1
003B LLCDWrite$nVal$1$1
003D LLCDWrite$lVal$1$1
0041 LHexByteToString$sloc0$1$0
.....
I am of course using the large-model as stated in the documentation.
As it seems the problem always occures when I use pointer arguments.
According to the documentation (if I understand everything correctly)
sdcc should allocate memory for these arguments in XDATA and not in
DATA memory (assumed I do not tell it do so by declaring the function
reentrant). Here is the command line I use for sdcc:
sdcc --model-large --xram-loc 0x0800 --code-loc 0x2000 --data-loc 0x30
--idata-loc 0x30 -Wl -bBSEG=0x30 --iram-size 0x100 --no-pack-iram
--debug ./build/stm.rel ...
How do I get sdcc to use XDATA instead of DATA for these kind of
functional arguments? XSTACK is no option for me.
As side effect I experienced the following strange thing:
As I switched from version 2.5.0 to 2.6.0 I observed that the
map file does not contain the table of symbols allocated in the
DATA memory. Only when I add the command line option '--debug'
to sdcc 2.6.0 these symbols appear in the map file.
I just check again with sdcc 2.5.0: with this version the command line
option '--debug' is not necessary for the linker to dump the table of
symbols allocated in the DATA memory to the map file.
Has there been any change in how the map file is generated? Can anyone
confirm that '--debug' is mandatory for the linker to dump symbols
allocated in DATA memory?
many thanks, Felix
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