[PATCH] x86: adjust relocation overflow complaint types

Michael Matz matz@suse.de
Mon Aug 1 09:53:00 GMT 2005


Hi,

On Mon, 1 Aug 2005, Andreas Schwab wrote:

> > % ./ld/ld-new -o mm -Ttext 0 -e bios_f000 mm.o
> > mm.o: In function `bios_f000':
> > : relocation truncated to fit: R_386_PC16 against symbol `bios_f000' 
> > defined in .text section in mm.o
> >
> > This is because bfd now thinks the jump is out of range.
> 
> Which is correct, in the context of 32 bit ELF.

Yeah.

> > I don't know how to teach bfd to make a difference between .code16 and
> > .code32 (or .code64 for that matter) in doing the overflow checking.
> 
> The linker only knows about the 32 bit ELF format.  There is no
> relocation that can represent a pc-relative relocation that wraps around
> in 16 bits.

Right, but fact is, that dosemu can now not be build anymore, and from a 
user perspective this error message is wrong.  Perhaps a PC16 reloc 
should just not warn on suspected overflow, because it most often will be 
used in .code16 context probably.


Ciao,
Michael.



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