create relocation entry from scratch

[peter matula <xmatul01 at stud dot fit dot vutbr dot cz>]

Hello,

I'm using BFD to transform our internal binary format to ELF. I have 
already successfully made transformation of executable files which can 
be described like this:

CreateBfd();    // create BFD file
GetArch();    // convert arch and mach info from our format to BFD
CreateSections();    // create sections in BFD
GetSymtab();    // create and fill symbol table
GetSectionData();    // copy data from out format to BFD
CloeBfd();    // write and close BFD

Now i would like to add relocation conversion. Until now everything went 
well but i stuck on this. When should I add relocations ? During section 
creation in CreateSections(), after GetSymTab() or somewhen else ?
And how should i create relocation entry from scratch ? I found few 
examples like this:

relpp = (arelent **) xmalloc(get_reloc_upper_bound(ibfd, isec));
relcount = bfd_canonicalize_reloc(ibfd, isec, relpp, sympp);
bfd_set_reloc(obfd, osec, relpp, relcount);

But I can not use bfd_canonicalize_reloc() to get info from out format 
and I have to fill each reloc entry manually. Is this the right way or 
should I use something like this:

arelent_chain *reloc = (arelent_chain *)bfd_alloc(abfd, 
sizeof(arelent_chain));
...
rel_section->constructor_chain = reloc;

Problem is, there is not function bfd_alloc() in my bfd.h and I did not 
find it in latest binutils either. What happend to it ?

Thanks for advices.
Peter Matula