RE: Please help get me started...

[David Korn <dkorn at pixelpower dot com>]

I wrote....

8<----------------------------
  Well, I'd say neither really.  What you are doing constitutes porting
gcc to a new target architecture - not arm-linux-elf, but arm-uclinux-elf.
The abi and implementation details of the C library (which after all is
the interface between the C application environment and the OS) are one
of the defining characteristics of the port (the other main ones being
CPU and object file format).
   
     [SNIPPO!]

  For this to work, you would then do a "make LANGUAGES=c" to build the
raw C compiler without worrying about libs or startup files.  Then do
"make LANGUAGES=c install" to install what you've got so far.  At that
point, you can use this raw compiler to build the uclinux c library from
source.  That will supply you with your libc, libm and crt startup files.
8<----------------------------

  Sorry, I haven't been clear here.  What matters is the calling convention
used to make syscalls into the OS, and the frame layout and argument
passing behaviour that it expects.  If these match standard linux
conventions, then ignore the first paragraph - arm-linux-elf should work,
as long as you use it to build the C lib from source, and you might yet
have to make a few fixincs patches.

  It's only if the conventions don't match that you're really defining
a new target, and that is far more involved.  You'd have to patch the
code in config/arm/whatever (probably arm.c) to emit assembler code
that implemented the new stack frame / syscall method / whatever.  That
would be where things got really tricky.  The process of building a raw
C compiler, using that to make the libc and startup files, and then
using those to finish building the full compiler, should be much simpler
than that.

  So tell us more about uclinux:  does it use exactly the same ABI as
standard linux?

       DaveK
-- 
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       -- CNN 2/28/01 


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