Thanks for Your reply.
I am not sure if I understand it correctly. When I need to compile
source, code should be in INITIALIZED section to get correct addresses;
INITIALIZER section will contain .ds with correct size just to make
place for initialization data after special utility is executed - this
below mentioned utility should move this data to this place in
INITIALIZER section. Startup code then takes data from INITIALIZER and
moves it back to RAM to INITIALIZED section for run-time. Do I
understand it correctly? Is it possible to download Fuzix source (at
least these low-level parts) to get inspiration?
Hynek
Dne 11.11.2014 12:18, Alan Cox napsal(a):
BTW, it seems to me that there is some problem with crt0.s - I have to
have my own start-up routine so I used crt0.s as template. Unfortunately
it can't be compiled unless .globl is added for l__INITIALIZE* and
s__INITIALIZE* values. Does it work differently when using standard crt0.s?
Not really. You want to do two things in the start of crt0.s
1. Mention all the sections you have in the order you want them to be
linked (in particular gs* ordering matters a lot)
2. .globl any s__ or l__ symbol you need to reference in the crt0.s code
itself.
What I do for Fuzix btw is I have a program that loads the binary image
built from sdcc and then copies the INITIALIZER data into INITIALIZED,
trims the image and resave it. As I link INITIALIZER somewhere bogus (or
at the end of the image) I can then trim the image to size. I can send
you the source for that tool - it's pretty trivial as it just reads from
the map file to work out what to move.
Alan
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