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Re: x86 - linker optimization of "call *constant_variable" - feasible?
On Tue, Aug 12, 2003 at 10:39:17PM -0700, Zack Weinberg wrote:
> Ok, so, I'm not necessarily volunteering to implement this, but could
> you give me a rundown on how one adds a new reloc type
Hmm, probably the easiest way is to look at a patch that recently
added some new reloc types. For example,
http://sources.redhat.com/ml/binutils/2003-07/msg00003.html
Add R_386_something to include/elf/i386.h
Add BFD_RELOC_something to bfd/reloc.c if no existing reloc will do.
Add reloc howto, and code to handle reloc in reloc_type_lookup and other
functions in bfd/elf32-i386.c. Most places it should behave exactly as
R_386_32.
Generate the reloc in gas/config/tc-i386.c, most likely spot is fudging
reloc_type in output_disp as done for got relocs.
>, and what
> pitfalls one might encounter? Are there backward compatibility
> concerns?
Objects generated by a new toolchain wouldn't be able to be linked by
older ld, or non-GNU ld.
--
Alan Modra
IBM OzLabs - Linux Technology Centre