Home Original page

Linking very large programs with inadequate branch displacements

Bill Yoder byoder@cs.utexas.edu
Tue Aug 16 21:46:00 GMT 2005 
Dear Alan, H.J., Nick, and H-P,

Thanks for your prompt help:

 > Please check out elfNN_ia64_relax_section in elfxx-ia64.c.
 > H.J.
 >
 > Also have a look at bfd/elf32- 
xstormy16.c:xstormy16_elf_check_relocs().
 > Nick
 >
 > See elf32-hppa.c and elf64-ppc.c for one method of doing this, and
 > elf32-ppc.c for another.
 > Alan Modra
 >
 > Usually referred to as a "trampoline" or "stub".  For yet
 > another implementation, see bfd/elf64-mmix.c, handling of
 > R_MMIX_PUSHJ_STUBBABLE.  See also gas/config/tc-mmix.c for when
 > these relocs are generated.
 > brgds, H-P

I've looked at these examples, cooked an x86/Linux version of  
binutils for --target=ppc-elf32-linux, and run a number of gcc 3.2  
PPC-compiled files through the debuggable assembler and linker.

Alan, I can't figure out how to hit a breakpoint at  
ppc_elf_relax_section:elf32-ppc.c.  Is there a command line switch I  
should throw, or would you have some C/ASM source that will trigger  
this routine?

Bill

P.S. I appreciate the humor sprinkled in the sources:
"Oh dear, we can't reach a trampoline...", "If the branch and target  
are in the same section, you've got one honking big section...", etc.


>
More information about the Binutils mailing list