From: "Felipe Monteiro de Carvalho"
<[EMAIL PROTECTED]>
It seams that building arm4 software isn't supported for Symbian OS.
At least for third-party software, and any example build for it
crashes on startup. So I was investigating other solutions.
I was reading the nokia wiki:
http://wiki.forum.nokia.com/index.php/ARM4,_ARMI_&_THUMB
http://wiki.forum.nokia.com/index.php/Build_Targets
Quoting:
"ARMI is the 32-bit instruction set with extra logic to allow it to
call THUMB code in addition to other 32-bit code. ARMI is known as
ARM
interchange format."
It seams that ARMI could be a solution. Executables built for ARMI
actually work normally, but there seams to be a lack of information
of
what exactly is ARMI. The descriptions found are not detailed
enougth.
My greatest doubt is: Can I just compile normal arm4 object files
with
fpc and link them together with armi compiled object files to get
the
final executable?
I have a fealing this could work, even if FPC doesn't do that "extra
logic to call THUMB", because we don't call the OS routines
directly,
but rather thougth a c wrapper.
I will, of course, just test, but it will be a lot of work, and if
someone knows in advance this should theoretically work, or
shouldn't,
that could speed things up =)
The solution is to create wrapper library for OS calls. The library
will do arm->thumb interworking. It will switch to thumb mode before
OS call and switch back to ARM mode after OS call.
Also startup code for FPC program should switch CPU to ARM mode.
Yury.
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