On Sun, Apr 22, 2001 at 06:07:18PM -0700, Keith M Wesolowski wrote:
> On Wed, Apr 18, 2001 at 04:37:27PM -0400, Daniel Jacobowitz wrote:
>
> > If you're referring to libc-mips-04052001.patch.bz2, that's what I
> > started with. I needed two changes on top of it. I'll post them in a
> > bit.
>
> Have you or anyone else made further progress on this? One of the
> additional patches is obvious; the glibc stuff is not so obvious.
I have them working in the case I care about - no backwards
compatibility at all. We (Monta Vista) can get away with this :)
I've attached the patches.
I can not do a more general fix for supporting both kinds of
executables unless someone with a better understanding of ELF than I is
willing to answer the questions I believe I sent to this list a few
days ago.
The only way I can see to get at the DT_MIPS(BASE_ADDRESS) or whatever it
was called early enough to use it requires some extra disk activity; it
shouldn't be too harmful, but I'd rather not impose that much of a
speed penalty for every open of a shared object. Perhaps it could be
done efficiently with mremap()...
I still don't see why BASE_ADDRESS is necessary, but I'm sure there was
a good reason it was added. I've never seen a shared object with the
virtual address of the first LOAD not equal to the base address...
--
Daniel Jacobowitz Debian GNU/Linux Developer
Monta Vista Software Debian Security Team
diff -urN libc-04052001/sysdeps/mips/mipsel/rtld-parms libc-04052001-patched/sysdeps/mips/mipsel/rtld-parms
--- libc-04052001/sysdeps/mips/mipsel/rtld-parms Sat Jul 12 18:26:15 1997
+++ libc-04052001-patched/sysdeps/mips/mipsel/rtld-parms Fri Apr 6 09:23:27 2001
@@ -1,3 +1,3 @@
ifndef rtld-oformat
-rtld-oformat = elf32-littlemips
+rtld-oformat = elf32-tradlittlemips
endif
--- glibc-2.2.3/sysdeps/mips/rtld-parms.orig Wed Apr 11 16:12:56 2001
+++ glibc-2.2.3/sysdeps/mips/rtld-parms Wed Apr 11 16:13:03 2001
@@ -2,7 +2,7 @@
rtld-wordsize = 32
endif
ifndef rtld-oformat
-rtld-oformat = elf$(rtld-wordsize)-bigmips
+rtld-oformat = elf$(rtld-wordsize)-tradbigmips
endif
ifndef rtld-arch
rtld-arch = mips
--- glibc-2.2.3/sysdeps/mips/dl-machine.h.orig Wed Apr 18 14:20:17 2001
+++ glibc-2.2.3/sysdeps/mips/dl-machine.h Wed Apr 18 14:21:15 2001
@@ -61,6 +61,9 @@
in l_info array. */
#define DT_MIPS(x) (DT_MIPS_##x - DT_LOPROC + DT_NUM)
+#if 0
+/* mvista: This is no longer needed, or safe, after the tradlittlemips patch. */
+
/*
* MIPS libraries are usually linked to a non-zero base address. We
* subtract the base address from the address where we map the object
@@ -76,6 +79,7 @@
(l)->l_info[DT_MIPS(BASE_ADDRESS)]->d_un.d_ptr : 0)
#else
#define MAP_BASE_ADDR(l) 0x5ffe0000
+#endif
#endif
/* If there is a DT_MIPS_RLD_MAP entry in the dynamic section, fill it in
