Jose E. Marchesi
6d0a6093c5
The SPARC ELF BFD backend uses a hack in order to accomodate the
STT_REGISTER symbols mandated by the SPARC V9 ABI for 64-bit objects.
The hack works as follows:
- Early in `size_dynamic_symbols', it adds the dynamic STT_REGISTER
symbols and the corresponding DT_SPARC_REGISTER tags if needed,
i.e. if the input object has been annotated by the assembler to use
any of the global registers requiring annotations by the ABI.
The STT_REGISTER symbols are not local, but nevertheless they are
added to the end of the dynlocal linked list (eek, yes) to be fixed
"later". This is done so the symbols are emitted in the symtab.
- Consequently, when the `sh_info' field of the .dynsym section is
calculated in `bfd_elf_final_link' to be `local_dynsymcount + 1', it
may have the wrong value, since the real first global symbol is the
first STT_REGISTER symbol.
- However, this temporary inconsistency is fixed in the
`elf64_sparc_output_arch_syms' backend hook: the sh_index is
adjusted to its rightful value. So all is well and good.
However the 2015 changeset
commit 8539e4e89e
Author: Alan Modra <amodra@gmail.com>
Date: Thu Jan 15 19:42:59 2015 +1030
Fix ARM fail of gap test
ld-elf/gap test was failing due to the ARM backend attempting to output
arch symbols when ld -s (strip all symbols) is in force. This patch
stops that happening and tidies the code a little.
made the `elf_backend_output_arch_syms' backend hook to not be called
when all symbols are to be stripped. This resulted in an incorrect
sh_index for .dynsym when a link is performed with -s (strip_all), in
64-bit sparc ELF objects.
This patch moves the sh_index adjusting code from the target
`output_arch_syms' to `finish_dynamic_sections'. It also removes the
strip_all check from `elf64_sparc_output_arch_syms', as the function
is no longer called in that case.
Tested in sparc64-linux-gnu and sparc-linux-gnu.
No regressions observed.
bfd/ChangeLog:
2018-10-04 Jose E. Marchesi <jose.marchesi@oracle.com>
* elf64-sparc.c (elf64_sparc_output_arch_syms): Do not correct the
impact of STT_REGISTER symbols in the dynsym sh_index here...
* elfxx-sparc.c (_bfd_sparc_elf_finish_dynamic_sections): ... but
do it here.
README for GNU development tools This directory contains various GNU compilers, assemblers, linkers, debuggers, etc., plus their support routines, definitions, and documentation. If you are receiving this as part of a GDB release, see the file gdb/README. If with a binutils release, see binutils/README; if with a libg++ release, see libg++/README, etc. That'll give you info about this package -- supported targets, how to use it, how to report bugs, etc. It is now possible to automatically configure and build a variety of tools with one command. To build all of the tools contained herein, run the ``configure'' script here, e.g.: ./configure make To install them (by default in /usr/local/bin, /usr/local/lib, etc), then do: make install (If the configure script can't determine your type of computer, give it the name as an argument, for instance ``./configure sun4''. You can use the script ``config.sub'' to test whether a name is recognized; if it is, config.sub translates it to a triplet specifying CPU, vendor, and OS.) If you have more than one compiler on your system, it is often best to explicitly set CC in the environment before running configure, and to also set CC when running make. For example (assuming sh/bash/ksh): CC=gcc ./configure make A similar example using csh: setenv CC gcc ./configure make Much of the code and documentation enclosed is copyright by the Free Software Foundation, Inc. See the file COPYING or COPYING.LIB in the various directories, for a description of the GNU General Public License terms under which you can copy the files. REPORTING BUGS: Again, see gdb/README, binutils/README, etc., for info on where and how to report problems.