Zack Weinberg wrote: > Daniel Jacobowitz <dan@debian.org> writes: > > > On Tue, Sep 23, 2003 at 11:01:11AM -0700, Eric Christopher wrote: > >> > >> I'm still trying to figure out why you are going through such weird > >> contortions at all. I understand not having an elf64 loader. That's what > >> the objcopy comment was for, everything else I don't understand. Why not > >> compile for the abi you want? > > > > Compare the optimal way to load an address into a register when you > > have a full 64-bit address space and when you know that addresses are > > sign extended. I'm told it saves over 100K of code. > > Maybe what you really want is an -mdata-model=kernel switch (or some > such spelling) Well, an ELF64 kernel loaded in the 64bit address space is also legal, and desireable on some (bigger) hardware. Btw, it would have to be -mtext-model=kernel, the data is the same. :-) > that tells gcc to do the right thing in the first place? Gcc still generates MIPS assembler macros, so such a switch would do nothing yet. Gcc should be changed to do the expansion itself (and improve code quality by that), but that's a much larger task. Thiemo
