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_SC_PAGESIZE is standard. Some ancient legacy unix variants used _SC_PAGE_SIZE
instead, but we are not such a system and should not propagate such things.

_SC_PAGESIZE is standard. Some ancient legacy unix variants used _SC_PAGE_SIZE
instead, but we are not such a system and should not propagate such things.

Use MAP_PRIVATE whenever __ARCH_HAS_MMU__ is set.
Only use MAP_SHARED when mmu-less.

Atsushi Nemoto writes:

This is a patch for uClibc/libc/sysdeps/linux/mips/sys/procfs.h pulled
from glibc CVS.

This fixes gdb with threaded application (with glibc environment).
Although debugging threaded programs seems not working on uClibc/mips
yet, this patch will be required when it becomes working.

This patch can be applied to any version of uClibc (including current
CVS).

h8300 updates from Yoshinori Sato

Patch from Yoshinori Sato to add H8/300 relocation types.

Peter Kjellerstedt at axis.com writes:

Hello,

the attached patch should bring extra/config in line
with the Linux 2.6.7 sources.

The following are the commit messages for the respective
files from the Linux bk-repository:

checklist.c:
* fix menuconfig choice item help display

confdata.c:
* config: choice fix
* kconfig: don't rename target dir when saving config

expr.c, expr.h:
* config: disable debug prints

mconf.c:
* fix menuconfig choice item help display

menu.c:
* Kconfig: use select statements

symbol.c:
* config: choice fix
* Avoid bogus warning about recursive dependencies
* c99 struct initialiser conversions

textbox.c:
* janitor: don't init statics to 0

util.c:
* fix lxdialog behaviour

//Peter

Sigh. I got things working this morning, then checked stuff in from the wrong
tree. Bad boy, No doughnut.
-Erik

Based on a patch from Alexandre Oliva, make sure _dl_malloc returns a nicely
aligned pointer that may be aligned up to page_size. Also add _dl_free,

Update FAQ a bit

Joakim Tjernlund writes:

Hi yet again :)

in dl-startup.c when performing boot strap relocation the following test
exists to make sure that only "_dl_" symbols are relocated:
/* We only do a partial dynamic linking right now. The user
is not supposed to define any symbols that start with a
'_dl', so we can do this with confidence. */
if (!symname || !_dl_symbol(symname)) {
continue;
}

However on PPC(and the other archs as well I suspect) all symbols are
"_dl_" symbols so the test is never true. The test can be removed and the
whole loop simplified(smaller). This also makes it possible to
simplify elfinterp.c

This remove the scanning of ldso.so relocs, making relocation faster.

I have tested this on PPC and it works well.
Do you think this optimization will work for the other arches as well?
I can't see why not.

Jocke

* Tested on x86, arm, mipsel, and powerpc by Erik and works nicely
-Erik

Disable support for R_ARM_PC24, just like R_PPC_REL24 these should
only occur when shared libs are not compiled with -fPIC

Let dl-string.h include dl-sysdep.h, since it has proper include guards

Whine about R_PPC_REL24 relocations, and tell people to compile
shared libraries with -fPIC

Joakim Tjernlund writes:

Make old weak symbol handling work, if someone wants to
enable it.

Joakim Tjernlund writes:

Since MIPS don't have COPY relocs it seems apropiate to define
DL_NO_COPY_RELOCS. This will optimize dl_find_hash somewhat.

Joakim Tjernlund writes:

Glibc does not use COPY class for SHN_COMMOM in MIPS. Make uClibc ldso
the same.

Bradley D. LaRonde writes:

dl-string.h references do_rem, but do_rem is a #define in <arch>/dl-sysdep.h
which is not included by dl-sysdep.h. This causes a problem in libdl:

In file included from ../../ldso/include/ldso.h:27, from libdl.c:33:
../../ldso/include/dl-string.h: In function `_dl_simple_ltoa':
../../ldso/include/dl-string.h:216: warning: implicit declaration of
function `do_rem'

Include dl-sysdep.h in dl-string.h before using do_rem.

note new mailing list posting policy

Stephen Hemminger from osdl dot org writes:

Rather than copy more code back into the bridge-utilities, how about applying this
change to uClibc? I hate when packages get cluttered for workarounds for other
incompatibilities.

The problem is that SIOCGIFCONF only lists interfaces that have IP addresses, so it
doesn't find the other interfaces that are being used for bridging. It could be fixed
in the kernel to return all interfaces, but then something else might break; and still
it mean a kernel update for the 2.4 users.

The whole use of ifindex in the bridge API is a bad idea. But we probably have to live
with it for compatibility.

Patch against uClibc 0.9.26

Jakub Bogusz from pld-linux dot org writes:

Hello,

I managed to get ldso (and thus shared linking to uClibc) to work on
sparc (actually sparc64 kernel with 32-bit userspace), at least on
simple "hello world" program (more complex ones not tested).

Some notes on attached patch (against 0.9.26, would require some work
to apply on current CVS - but I tested 0.9.26, not CVS):

- ELF magic cannot be examined by _dl_strncmp so early, probably because of
string constant, like on ppc/mips/sh
(note that early SEND_STDERR still crashes when trying to do _dl_strlen
- I suppose that string constants require relocation; but adding
load_addr didn't help, just ELF header was displayed instead of crash)
- mmap() is syscall6 like on ppc/mips/sh, not old i386 mmap()
- for generic sparc (i.e. not sparcv8/sparcv9) gcc produces .udiv/.urem
calls for unsigned integer / and % operators - so these operations
must be avoided. I copied do_rem definition from arm header.
But / and % are used also in _dl_simple_ltoa() and
_dl_simple_ltoahex(); in ltoahex gcc optimizes it to shifts (but
I think it's safer to use shifts explicitly, not rely on
optimization...).
I changed % in ltoa to do_rem, but as there was no do_div definition,
I changed all "%d" specifiers to "%x" to avoid crashes (this changes
wouldn't be needed if _dl_simple_ltoa() were fixed to not use
division on sparc).
- "#define SOLARIS_COMPATIBLE" in ld_sysdep.h broke ldso on Linux
because of redefining _dl_linux_resolve only in some places (it was
still referenced in INIT_GOT before redefinition). So
_dl_linux_resolve redefinition should be moved before INIT_GOT
definition or removed.
- sparc64 kernel requires mmap() addresses to be aligned to 8192, not
4096, otherwise mmap() call failed
- reloc_entry must be shifted by 10, not 12 (I found similar operation
in glibc sources)

Aside of sparc-specific fixes:
- I moved some _dl_dprintf()s inside if(_dl_debug_*) conditions (to avoid
debugging messages when LD_DEBUG is not defined)
- it seems that there was possible off-by-one in ltoa and ltoahex?
they are called with char[22] as 1st argument, and then '\0' is stored
in local[22] (_before_ p decrementation)... or am I missing something?
If not, fix is included in patch.

Philip Craig at snapgear dot com writes:

Strlen was counting the last 3 bytes incorrectly for big endian arm.

Per comments from Bernhard Rosenkraenzer, adjust gcc 3.3.x generated asm
with s/i686.get_pc_thunk.bx/get_pc_thunk_bx/g to make gcc 3.4 happy.

Oops. Missed a spot.

scrap the goofy time + getpid() based "randomness" and use
the real thing.

Removed unused file.

Cope when the __NR_get_kernel_syms is undefined (i.e. 2.6.x arm-linux)

Fix changed link into the mailing list archive.

Joakim Tjernlund writes:

Hi Erik

It seems to me that __pthread_once and __pthread_initialize_minimal could be made
WEAKs with no stub. The code in rpc_thread.c and __uClibc_main.c appears to expect this.
Also, __pthread_return_0 __pthread_return_1 and __pthread_return_void can be static, not to
pollute the name space.

Jocke

Alexandre Oliva writes:

Here are a number of minor changes to FR-V-specific bits of the uClibc
port:

- I've adjusted the definition of _dl_mmap to cope with the fact that
there will be a definition for an mmap2-only system.

- We don't have COPY relocs, so optimize the copy reloc-related code
away.

- Change the page size to 16KiB, to match the ABI spec, and not a
stale value I'd copied from a linker config file. Oops.

- Fix error handling in clone and vfork; parts of the changes by David
Howells <dhowells@redhat.com>

- Rearrange includes in crtreloc.c.

- Change the API of __syscall_error, to reduce code size.

- Improve __syscall_return in terms of code size, so as to enable
tail-calling of __syscall_error, at least within libc. Ideally,
__syscall_error should be hidden within libc.so, but this didn't
work because of libdl. I haven't looked into why, and figured I'd
leave it visible for now.

- Rename enumerators and macros in sys/ucontext.h to reduce namespace
pollution.