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Andrew Sadek <andrew.sadek.se@gmail.com> A new implemented feature in GCC Microblaze that allows Position Independent Code to run using Data Text Relative addressing instead of using Global Offset Table. Its aim was to make 'PIC' more efficient and flexible as elf size excess performance overhead were noticed when using GOT due to the indirect addressing. include/ChangeLog: * bfdlink.h (Add flag): Add new flag @ 'bfd_link_info' struct. * elf/microblaze.h (Add 3 new relocations): R_MICROBLAZE_TEXTPCREL_64, R_MICROBLAZE_TEXTREL_64 and R_MICROBLAZE_TEXTREL_32_LO for relax function. bfd/ChangeLog: * bfd/reloc.c (2 new BFD relocations): BFD_RELOC_MICROBLAZE_64_TEXTPCREL & BFD_RELOC_MICROBLAZE_64_TEXTPCREL * bfd/bfd-in2.h: Regenerate * bfd/libbfd.h: Regenerate * bfd/elf32-microblaze.c (Handle new relocs): define 'HOWTO' of 3 new relocs and handle them in both relocate and relax functions. (microblaze_elf_reloc_type_lookup): add mapping between for new bfd relocs. (microblaze_elf_relocate_section): Handle new relocs in case of elf relocation. (microblaze_elf_relax_section): Handle new relocs for elf relaxation. gas/ChangeLog: * gas/config/tc-microblaze.c (Handle new relocs directives in assembler): Handle new relocs from compiler output. (imm_types): add new imm types for data text relative addressing TEXT_OFFSET, TEXT_PC_OFFSET (md_convert_frag): conversion for BFD_RELOC_MICROBLAZE_64_TEXTPCREL, BFD_RELOC_MICROBLAZE_64_TEXTPCREL (md_apply_fix): apply fix for BFD_RELOC_MICROBLAZE_64_TEXTPCREL, BFD_RELOC_MICROBLAZE_64_TEXTPCREL (md_estimate_size_before_relax): estimate size for BFD_RELOC_MICROBLAZE_64_TEXTPCREL, BFD_RELOC_MICROBLAZE_64_TEXTPCREL (tc_gen_reloc): generate relocations for BFD_RELOC_MICROBLAZE_64_TEXTPCREL, BFD_RELOC_MICROBLAZE_64_TEXTPCREL ld/ChangeLog: * ld/lexsup.c (Add 2 ld options): (ld_options): add disable-multiple-abs-defs @ 'ld_options' array (parse_args): parse new option and pass flag to 'link_info' struct. * ld/ldlex.h (Add enum): add new enum @ 'option_values' enum. * ld/ld.texinfo (Add new option): Add description for 'disable-multiple-abs-defs' * ld/main.c: Initialize flags with false @ 'main'. Handle disable-multiple-abs-defs @ 'mutiple_definition'.
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.