Re: binutils porting to new CPU

[Ralph Escherich <esche at mobilesmartsinc dot com>]

I tried building binutils-2.14 for the openrisc-elf target and get the 
following error message:

openrisc-asm.c: In function `openrisc_cgen_assemble_insn':
openrisc-asm.c:584: error: `CGEN_INSN_RELAX' undeclared (first use in this 
function)
openrisc-asm.c:584: error: (Each undeclared identifier is reported only once
openrisc-asm.c:584: error: for each function it appears in.)
make[3]: *** [openrisc-asm.lo] Error 1

openrisc-asm.c was generated by cgen

Any ideas??

Esche

On Wednesday 29 October 2003 08:50, Frank Ch. Eigler wrote:
> Hi -
>
> >  [...]
> > Do you have a more detailed API description of what is generated and
> > how it should be used for porting the binutils? [...]
>
> There isn't a really good list, I'm afraid.  None of those who have
> built a complete port took the extra time to document all the steps
> and nuances.  It's all rather vernacular: start based on an existing
> port, do a massive search & replace for a new port name, ask here when
> you run into trouble.  A simple port may go smoothly enough not to
> need any help.
>
> > Also gas/cgen.c contains code for fixups and parsing. How does all
> > this fit into the big picture of porting binutils to a new cpu target?
>
> It's a necessary detail.  The fewer addressing modes your target
> supports,
> and the simpler the layout of the operands that parametrize any given
> address, the simpler (to almost nonexistent) these functions can be.
>
> > How do fixups and frags ??? fit into the API? [...]
>
> They barely do.  Some CGEN operand parsing functions plop fixups into
> the assembler, for ultimate disposition as an assembly-time constant,
> or emission as a link-time relocation.  Frags are little
> partially-filled-in byte strings that are concatenated ultimately
> to form object code.  All this is deep GAS/BFD magic, not really cgen
> related.
>
>
> - FChE

-- 
Ralph Escherich                               2900 Gordon Avenue Suite 203
Senior IC Design Engineer                     Santa Clara, CA 95051-0718
Phone:  408-328-9333
Fax:    408-735-1163

http://www.mobilesmartsinc.com