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When running GDB's testsuite on aarch64-linux/Ubuntu 20.04 (also spotted on the ppc backend), there are failures in gdb.reverse/solib-precsave.exp and gdb.reverse/solib-reverse.exp. The failure happens around the following code: 38 b[1] = shr2(17); /* middle part two */ 40 b[0] = 6; b[1] = 9; /* generic statement, end part two */ 42 shr1 ("message 1\n"); /* shr1 one */ Normal execution: - step from line 38 will land on line 40. - step from line 40 will land on line 42. Reverse execution: - step from line 42 will land on line 40. - step from line 40 will land on line 40. - step from line 40 will land on line 38. The problem here is that line 40 contains two contiguous but distinct PC ranges in the line table, like so: Line 40 - [0x7ec ~ 0x7f4] Line 40 - [0x7f4 ~ 0x7fc] The two distinct ranges are generated because GCC started outputting source column information, which GDB doesn't take into account at the moment. When stepping forward from line 40, we skip both of these ranges and land on line 42. When stepping backward from line 42, we stop at the start PC of the second (or first, going backwards) range of line 40. Since we've reached ecs->event_thread->control.step_range_start, we stop stepping backwards. The above issues were fixed by introducing a new function that looks for adjacent PC ranges for the same line, until we notice a line change. Then we take that as the start PC of the range. The new start PC for the range is used for the control.step_range_start when setting up a step range. The test case gdb.reverse/map-to-same-line.exp is added to test the fix for the above reverse step issues. Patch has been tested on PowerPC, X86 and AArch64 with no regressions. |
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bfd | ||
binutils | ||
config | ||
contrib | ||
cpu | ||
elfcpp | ||
etc | ||
gas | ||
gdb | ||
gdbserver | ||
gdbsupport | ||
gnulib | ||
gold | ||
gprof | ||
gprofng | ||
include | ||
ld | ||
libbacktrace | ||
libctf | ||
libdecnumber | ||
libiberty | ||
libsframe | ||
opcodes | ||
readline | ||
sim | ||
texinfo | ||
zlib | ||
.cvsignore | ||
.editorconfig | ||
.gitattributes | ||
.gitignore | ||
ar-lib | ||
ChangeLog | ||
compile | ||
config-ml.in | ||
config.guess | ||
config.rpath | ||
config.sub | ||
configure | ||
configure.ac | ||
COPYING | ||
COPYING3 | ||
COPYING3.LIB | ||
COPYING.LIB | ||
COPYING.LIBGLOSS | ||
COPYING.NEWLIB | ||
depcomp | ||
djunpack.bat | ||
install-sh | ||
libtool.m4 | ||
lt~obsolete.m4 | ||
ltgcc.m4 | ||
ltmain.sh | ||
ltoptions.m4 | ||
ltsugar.m4 | ||
ltversion.m4 | ||
MAINTAINERS | ||
Makefile.def | ||
Makefile.in | ||
Makefile.tpl | ||
makefile.vms | ||
missing | ||
mkdep | ||
mkinstalldirs | ||
move-if-change | ||
multilib.am | ||
README | ||
README-maintainer-mode | ||
SECURITY.txt | ||
setup.com | ||
src-release.sh | ||
symlink-tree | ||
test-driver | ||
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.