Messages in this thread | | | Date | Wed, 6 Jun 2001 15:09:11 +0200 (MET DST) | From | "Maciej W. Rozycki" <> | Subject | Re: [patch] Re: Linux 2.4.5-ac6 |
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On Wed, 6 Jun 2001, Ivan Kokshaysky wrote:
> > No need to patch arch_get_unmapped_area(), but OSF/1 compatibility code > > might need fixing. I suppose an OSF/1 binary must have an appropriate > > flag set in its header after building with the -taso option so that the > > system knows the binary wants 32-bit addressing. > > I'm not sure if COFF headers have such flag at all. I'll check this.
Then how does OSF/1, especially the dynamic linker, know if a binary needs 32-bit addressing? I suppose we could use the same way of selection.
Hmm...:
$ uname -mprsv OSF1 V4.0 1091 alpha alpha $ file /usr/bin/X11/real-netscape /usr/bin/X11/real-netscape: COFF format alpha dynamically linked, demand paged executable or object module stripped - version 3.11-8 $ odump -D /usr/bin/X11/real-netscape | grep FLAGS FLAGS: 0x40000001 $ odump -D /usr/bin/X11/xterm | grep FLAGS FLAGS: 0x00000001
A wild guess: the 32-bit flag is bit 30.
A second attempt (after a bit of searching in /usr/include):
$ grep ADDRESSES /usr/include/elf_mips.h #define RHF_USE_31BIT_ADDRESSES 0x40000000
Ah, here it is. Remember OSF/1 was running on MIPS (DECstation) first and they never used ELF but apparently reused a few of its properties.
So what is needed is already in place and ready to use.
Maciej
-- + Maciej W. Rozycki, Technical University of Gdansk, Poland + +--------------------------------------------------------------+ + e-mail: macro@ds2.pg.gda.pl, PGP key available +
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