Go to file
Maciej W. Rozycki 17c6c9d9f3 MIPS: Fix the encoding of immediates with microMIPS JALX
The microMIPS JALX instruction shares the R_MICROMIPS_26_S1 relocation
with microMIPS J/JAL/JALS instructions, however unlike the latters its
encoded immediate argument is unusually shifted left by 2 rather than 1
in calculating the value used for the operation requested.

We already handle this exception in `mips_elf_calculate_relocation' in
LD, in a scenario where JALX is produced as a result of relaxing JAL for
the purpose of making a cross-mode jump.  We also get it right in the
disassembler in `decode_micromips_operand'.

What we don't correctly do however is processing microMIPS JALX produced
by GAS from an assembly source, where a non-zero constant argument or a
symbol reference with a non-zero in-place addend has been used.  In this
case the same calculation is made as for microMIPS J/JAL/JALS, causing
the wrong encoding to be produced by GAS on making an object file, and
then again by LD in the final link.  The latter in particular causes the
calculation, where the addend fits in the relocatable field, to produce
different final addresses for the same source code depending on whether
REL or RELA relocations are used.

Correct these issues by special-casing microMIPS JALX in the places that
have been previously missed.

	bfd/
	* elfxx-mips.c (mips_elf_read_rel_addend): Adjust the addend for
	microMIPS JALX.

	gas/
	* config/tc-mips.c (append_insn): Correct the encoding of a
	constant argument for microMIPS JALX.
	(tc_gen_reloc): Correct the encoding of an in-place addend for
	microMIPS JALX.
	* testsuite/gas/mips/jalx-addend.d: New test.
	* testsuite/gas/mips/jalx-addend-n32.d: New test.
	* testsuite/gas/mips/jalx-addend-n64.d: New test.
	* testsuite/gas/mips/jalx-imm.d: New test.
	* testsuite/gas/mips/jalx-imm-n32.d: New test.
	* testsuite/gas/mips/jalx-imm-n64.d: New test.
	* testsuite/gas/mips/jalx-addend.s: New test source.
	* testsuite/gas/mips/jalx-imm.s: New test source.
	* testsuite/gas/mips/mips.exp: Run the new tests.

	ld/
	* testsuite/ld-mips-elf/jalx-addend.d: New test.
	* testsuite/ld-mips-elf/jalx-addend-n32.d: New test.
	* testsuite/ld-mips-elf/jalx-addend-n64.d: New test.
	* testsuite/ld-mips-elf/mips-elf.exp: Run the new tests.
2016-05-20 13:38:48 +01:00
bfd MIPS: Fix the encoding of immediates with microMIPS JALX 2016-05-20 13:38:48 +01:00
binutils Prevent a run time segmentation fault when stripping a corrupt binary. 2016-05-18 15:21:16 +01:00
config Sync top level files with gcc. 2016-02-10 10:54:29 +00:00
cpu Correct fr30 comment 2016-03-03 12:55:30 +10:30
elfcpp Remove is_n64_ data member from Mips_relobj class. 2016-03-18 14:54:35 -07:00
etc Remove spurious empty line in changelog entry. 2016-03-18 13:09:03 +00:00
gas MIPS: Fix the encoding of immediates with microMIPS JALX 2016-05-20 13:38:48 +01:00
gdb Fix invalid implicit conversions from void * 2016-05-19 15:31:56 +02:00
gold Don't allow COPY relocations for protected symbols. 2016-05-19 15:05:03 -07:00
gprof Regenerate configure 2016-05-09 17:24:30 +09:30
include Add DW_LANG_Rust 2016-05-17 11:11:20 -06:00
intl
ld MIPS: Fix the encoding of immediates with microMIPS JALX 2016-05-20 13:38:48 +01:00
libdecnumber
libiberty Sync libiberty with GCC. 2016-01-28 21:44:42 +01:00
opcodes Correct "Fix powerpc subis range" 2016-05-19 16:56:02 +09:30
readline
sim Add support for FMLA (by element) to AArch64 sim. 2016-05-06 10:35:33 +01:00
texinfo
zlib Regenerate configure 2016-05-09 17:24:30 +09:30
.cvsignore
.gitattributes
.gitignore Import changes made to files shared with the FSF GCC project. 2016-01-11 11:06:56 +00:00
ChangeLog Sync Makefile.tpl with gcc. 2016-04-19 09:26:16 +01:00
compile
config-ml.in
config.guess Import changes made to files shared with the FSF GCC project. 2016-01-11 11:06:56 +00:00
config.rpath
config.sub Import changes made to files shared with the FSF GCC project. 2016-01-11 11:06:56 +00:00
configure Add mips and s390 build targets for gold. 2016-03-17 15:37:10 -07:00
configure.ac Add mips and s390 build targets for gold. 2016-03-17 15:37:10 -07:00
COPYING
COPYING3
COPYING3.LIB
COPYING.LIB
COPYING.LIBGLOSS
COPYING.NEWLIB
depcomp
djunpack.bat
install-sh
libtool.m4 Sync top-level btool.m4 with GCC 2016-01-12 08:44:52 -08:00
lt~obsolete.m4
ltgcc.m4
ltmain.sh
ltoptions.m4
ltsugar.m4
ltversion.m4
MAINTAINERS
Makefile.def Sync top-level Makefile.def with GCC 2016-01-12 08:34:40 -08:00
Makefile.in Sync Makefile.tpl with gcc. 2016-04-19 09:26:16 +01:00
Makefile.tpl Sync Makefile.tpl with gcc. 2016-04-19 09:26:16 +01:00
makefile.vms
missing
mkdep
mkinstalldirs
move-if-change
README
README-maintainer-mode
setup.com
src-release.sh fix gdb version parsing in src-release.sh 2016-01-17 10:01:55 +04:00
symlink-tree
ylwrap

		   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.