summaryrefslogtreecommitdiff
path: root/ldso
AgeCommit message (Collapse)Author
2004-06-12Jakub Bogusz from pld-linux dot org writes:Eric Andersen
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.
2004-05-14Alexandre Oliva writes:Eric Andersen
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.
2004-05-13update libdl so it also groks the new _dl_errnoEric Andersen
2004-05-13Bradley D. LaRonde writes:Eric Andersen
Oops, this adds the page alignment offset to the mprotected size. Regards, Brad
2004-05-12Patch from Bradley D. LaRonde:Eric Andersen
ld.so mprotect rwx .dyanmic segment for mips DT_DEBUG Allow writing debug_addr into the .dynamic segment. Even though the program header is marked RWE, the kernel gives it to us rx.
2004-05-12Add a local '_dl_errno' to be used by syscalls in ldso, allowingEric Andersen
useful syscall failure diagnostics.
2004-05-11As noticed by the sharp eyed Joakim Tjernlund, I stupidlyEric Andersen
hard coded 4096 instead of PAGE_SIZE. Because I'm an idiot.
2004-05-11make certain that getpagesize() returns correct the value for mipsEric Andersen
by extracting the value from the ELF header.
2004-05-11Bradley D. LaRonde, brad at laronde dot org writes:Eric Andersen
If I change that ELF_RTYPE_CLASS_COPY to ELF_RTYPE_CLASS_PLT to tell _dl_find_hash to ignore stubs when resolving undefined functions without stubs, the dlopen tests all pass. dlopen gets a pointer to the libc.so malloc instead of a pointer to the libpthread malloc stub. Yay! :-)
2004-05-10Save r0 before modifying it.Tobias Anderberg
2004-04-20Cope with gcc 3.4's more aggressive persuit of attribute unusedEric Andersen
2004-03-19Based on a patch from Alexandre Oliva, allow uClibc to compileEric Andersen
with __NR_mmap is not available (i.e. only __NR_mmap2)
2004-03-18Look in /usr/X11R6/lib as wellEric Andersen
2004-03-18Joakim Tjernlund writes:Eric Andersen
Hi I just noticed that gcc has an "b"(Address base register) operand that will match all "r" registers but r0. It is a better fix then adding r0 to the clobber list. What do you think?
2004-02-20Sigh. I switched the values...Eric Andersen
2004-02-20Per discussion with Joakim Tjernlund, all the horrible weak declarations junkEric Andersen
in libdl pointing to the local 'foobar' function is garbage. This cleans all that up and makes the code much less horrible. Now it is only really really ugly (which is a marked improvement),
2004-02-20Patch from Joakim Tjernlund:Eric Andersen
white space cleanup and optimize the inner loop in dl_find_hash.
2004-02-20___brk_addr and __environ are not functions. Finding the brokenEric Andersen
lookup on 'atexit' got me excited and I started fixing the same problem elsewhere. Except these were correct as-was, and were not a problem....
2004-02-20Slightly cleaner formattingEric Andersen
2004-02-20Patch by Joakim Tjernlund <joakim.tjernlund@lumentis.se>, which gotManuel Novoa III
mips mostly working. From there, I tracked the bash failure to a bad _dl_atexit address and Erik took it from there.
2004-02-20When doing symbol lookups on functionsEric Andersen
2004-02-18Minor change to better match recent changes to other archesEric Andersen
2004-02-18Alexandre Oliva writes:Eric Andersen
This patch adds code to uClibc to support a new ABI designed for the FR-V architecture, that enables text segments of executables and shared libraries to be shared by multiple processes on an OS such as uClinux, that can run on FR-V processors without an MMU. Patches for binutils and GCC have just been posted in the corresponding mailing lists. The binutils patch was approved, but there's one additional patch pending review, that I posted this week. An updated GCC patch will be posted to gcc-patches@gcc.gnu.org as soon as I complete testing (I used a known-good compiler to test the uClibc patch below). Since the existing dynamic loader code didn't support independent relocation of segments, it required changes that were somewhat extensive. I've added a number of new machine-specific macros to try to keep the platform and ABI-specific details outside the generic code. I hope this is not a problem.
2004-02-17Fixup support for gcc 2.95Eric Andersen
2004-02-17Seperate out the startup stuff from the non-startup stuff.Eric Andersen
Begin converting some big ugly macros to inline functions instead
2004-02-17Kill off an arm specific hack, that fostered three other arch specificEric Andersen
hacks. Just check for the elf magic string one byte at a time....
2004-02-17When doing _dl_mmap to obtain a bit of anonymous memory, use a much moreEric Andersen
sensible -1 fd, rather than pretending to work off of fd 0, which makes absolutely no sense.
2004-02-17Do not duplicate stuff from ldso.hEric Andersen
2004-02-17Provide the ldso syscalls and string funcs earlier in the listEric Andersen
2004-02-14No point in including debug info for ldso. It isn't helpful to do soEric Andersen
since gdb can't do anything for us.
2004-02-14Atsushi Nemoto writes:Eric Andersen
Also, if you are to enable SUPPORT_LD_DEBUG on MIPS, I think this patch is needed too.
2004-02-14Fix this as should have been done a long time ago...Manuel Novoa III
2004-02-14Give gcc branch prediction some hits on obviously unlikely branchesEric Andersen
2004-02-14Joakim Tjernlund writes:Eric Andersen
Hi it is me again. This is the latest ldso patch. the NEW weak symbol handling works now with a little special handling in _dl_find_hash(). You get to chose if you want the new or old handling :) There was 2 missing _dl_check_if_named_library_is_loaded() calls in _dlopen(). I then disabled the _dl_check_if_named_library_is_loaded() in dl-elf.c since it is rendundant. Question, why does some _dl_linux_resolver(), like i386, have 2 calls to _dl_find_hash()? I think that is wrong, isn't it? I really hope you can check this out soon ...
2004-02-12Based on a problem report and patch from Florian Schirmer, fix a compileEric Andersen
problem with mips -- contrary to my expectation gcc on mips _always_ defines __PIC__ which breaks the assumption inherent in my code. This should fix things up.
2004-02-10Eliminate the PIE support option, and simply support that all the timeEric Andersen
2004-02-10Fix function prototype to match the official ELF standard hash functionEric Andersen
2004-02-10Rework file naming, aiming for at least a vague level of consistancyEric Andersen
2004-02-10oops, manditory forgotten patchEric Andersen
2004-02-10Fixup the definition of _dl_open, and move some bits back where they were,Eric Andersen
till I properly finish the next step in my evil plan.
2004-02-08Move _dl_printf and _dl_malloc to ldso, which is a more sensibleEric Andersen
location for this stuff
2004-02-08Cleanup whitespace and formattingEric Andersen
2004-02-08Add some permissions when creating the logfileEric Andersen
2004-02-07Thanks to Joakim's recent paches, we can now remove the FIXMEEric Andersen
2004-02-07Restore the library entry point so it works. It does haveEric Andersen
to be arch specific to work properly.
2004-02-07Joakim Tjernlund writes:Eric Andersen
Hi again All dltest* and test* programs pass for me. uClibc ld.so resolves according to the OLD weak symbol handling. I have tried to use the new scheme as well, but that segfaults in all cases but test3.
2004-02-07Remove unneeded forward declarationEric Andersen
2004-02-07Split off the stuff that cannot use function into its own file,Eric Andersen
to make it easier to treat it specially while not bothering the rest of the code with the same constraints.
2004-02-07Step one, begin shuffling things around a bitEric Andersen
2004-02-07Yet more consistancy fixupsEric Andersen
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-08 00:11:52 +0000