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Consider the following test-case: ... $ cat test.c int main (void) { return 0; } $ clang -g -gsplit-dwarf test.c -o test $ llvm-dwp -e test -o test.dwp ... This runs into a segmentation fault: ... $ gdb -q -batch test Fatal signal: Segmentation fault ... The segmentation fault happens because in read_dwo_str_index this line sets p to nullptr: ... const gdb_byte *p = reader->dwo_file->sections.str_offsets.buffer; ... while the following code expects it to point to some data. The section we're trying to read is: ... (gdb) p reader->dwo_file->sections.str_offsets $4 = {s = {section = 0xffffcc00a9d0, containing_section = 0xffffcc00a9d0}, buffer = 0x0, size = 28, virtual_offset = 0, readin = false, is_virtual = true} ... At first glance, the section is not readin, but actually it is. This is a virtual section, meaning part of a containing section: ... (gdb) p *reader->dwo_file->sections.str_offsets.s.containing_section $8 = {s = {section = 0xffffcc00cde8, containing_section = 0xffffcc00cde8}, buffer = 0xffffcc009650 "\030", size = 28, virtual_offset = 0, readin = true, is_virtual = false} ... which is readin. Fix this in create_dwp_v2_or_v5_section by initializing the buffer of the virtual section using the buffer of the containing section: ... result.buffer = section->buffer + offset; ... Unfortunately it's difficult to write a test-case for this. We'll have to teach the dwarf assembler to generate dwp files. Tested on aarch64-linux. This is a partial fix for PR symtab/31497. Approved-By: Tom Tromey <tom@tromey.com> Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=31497 |
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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 | ||
.pre-commit-config.yaml | ||
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.