binutils-gdb modified for the FreeChainXenon project
![]() Pedro has kindly pointed out that gdb.arch/amd64-stap-optional-prefix.exp was failing after my C++-ification patches touching the probe interface. The failure is kind of cryptic: 77 break -pstap bar 78 Breakpoint 3 at 0x40048d 79 (gdb) PASS: gdb.arch/amd64-stap-optional-prefix.exp: bar: break -pstap bar 80 continue 81 Continuing. 82 83 Program received signal SIGILL, Illegal instruction. 84 main () at amd64-stap-optional-prefix.S:26 85 26 STAP_PROBE1(probe, foo, (%rsp)) It took me a while to figure out where this SIGILL is coming from. Initially I thought it was something related to writing registers to the inferior when dealing with probe arguments, but I discarded this since the arguments were not touching any registers. In the end, this was a mistake that was introduced during the review process of the patch. When setting/clearing a SystemTap probe's semaphore, the code was using 'm_address' (which refers the probe's address) instead of 'm_sem_addr' (which refers to the semaphore's address). This caused GDB to write a bogus value in the wrong memory position, which in turn caused the SIGILL. I am pushing this patch to correct the mistake. On a side note: I told Pedro that the BuildBot hadn't caught the failure during my try build, and for a moment there was a suspicion that the BuildBot might be at fault here. However, I investigate this and noticed that I only did one try build, with a patch that was correctly using 'm_sem_addr' where applicable, and therefore no failure should have happened indeed. I probably should have requested another try build after addressing the review's comments, but they were mostly basic and I didn't think it was needed. Oh, well. 2017-11-25 Sergio Durigan Junior <sergiodj@redhat.com> PR gdb/22491 * stap-probe.c (relocate_address): New function. (stap_probe::get_relocated_address): Use 'relocate_address'. (stap_probe::set_semaphore): Use 'relocate_address' and pass 'm_sem_addr'. (stap_probe::clear_semaphore): Likewise. |
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bfd | ||
binutils | ||
config | ||
cpu | ||
elfcpp | ||
etc | ||
gas | ||
gdb | ||
gold | ||
gprof | ||
include | ||
intl | ||
ld | ||
libdecnumber | ||
libiberty | ||
opcodes | ||
readline | ||
sim | ||
texinfo | ||
zlib | ||
.cvsignore | ||
.gitattributes | ||
.gitignore | ||
ChangeLog | ||
compile | ||
config-ml.in | ||
config.guess | ||
config.rpath | ||
config.sub | ||
configure | ||
configure.ac | ||
COPYING | ||
COPYING.LIB | ||
COPYING.LIBGLOSS | ||
COPYING.NEWLIB | ||
COPYING3 | ||
COPYING3.LIB | ||
depcomp | ||
djunpack.bat | ||
install-sh | ||
libtool.m4 | ||
ltgcc.m4 | ||
ltmain.sh | ||
ltoptions.m4 | ||
ltsugar.m4 | ||
ltversion.m4 | ||
lt~obsolete.m4 | ||
MAINTAINERS | ||
Makefile.def | ||
Makefile.in | ||
Makefile.tpl | ||
makefile.vms | ||
missing | ||
mkdep | ||
mkinstalldirs | ||
move-if-change | ||
README | ||
README-maintainer-mode | ||
setup.com | ||
src-release.sh | ||
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.