| Age | Commit message (Collapse) | Author | Files | Lines |
|---|
|
Eli mentioned [1] that given that we use US English spelling in our
documentation, we should use "behavior" instead of "behaviour".
In wikipedia-common-misspellings.txt there's a rule:
...
behavour->behavior, behaviour
...
which leaves this as a choice.
Add an overriding rule to hardcode the choice to common-misspellings.txt:
...
behavour->behavior
...
and add a rule to rewrite behaviour into behavior:
...
behaviour->behavior
...
and re-run spellcheck.sh on gdb*.
Tested on x86_64-linux.
[1] https://sourceware.org/pipermail/gdb-patches/2024-November/213371.html
|
|
With test-case gdb.debuginfod/solib-with-soname.exp on aarch64-linux, I ran
into:
...
(gdb) core-file solib-with-soname.core^M
Downloading 197.86 K file libfoo_1.so...^M
[New LWP 997314]^M
[Thread debugging using libthread_db enabled]^M
Using host libthread_db library "/lib64/libthread_db.so.1".^M
Core was generated by `solib-with-soname'.^M
Program terminated with signal SIGABRT, Aborted.^M
(gdb) FAIL: $exp: load core file, use debuginfod: load core file
...
The test-case doesn't expect the "197.86 K" part.
The same problem was fixed for another test-case in commit a723c56efb0
("gdb/testsuite: avoid intermittent failures on a debuginfod test").
Fix this in the same way: by updating the regexp.
Tested on aarch64-linux.
PR testsuite/32354
Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=32354
|
|
When opening a core-file GDB is able to use debuginfod to download the
executable that matches the core-file if GDB can find a build-id for
the executable in the core-file.
In this case GDB calls debuginfod_exec_query to download the
executable and GDB prints a message like:
Downloading executable for /path/to/core-file...
which makes sense in that case.
For a long time GDB has also had the ability to download memory-mapped
files and shared libraries when opening a core-file. However, recent
commits have made these cases more likely to trigger, which is a good
thing, but the messaging from GDB in these cases is not ideal. When
downloading a memory-mapped file GDB prints:
Downloading executable for /path/to/memory-mapped-file
And for a shared library:
Downloading executable for /path/to/libfoo.so
These last two messages could, I think, be improved.
I propose making two changes. First, I suggest instead of using
/path/to/core-file in the first case, we use the name of the
executable that GDB is fetching. This makes the messaging consistent
in that we print the name of the file we're fetching rather than the
name of the file we're fetching something for.
I further propose that we replace 'executable for' with the more
generic word 'file'. The messages will then become:
Downloading file /path/to/exec-file...
Downloading file /path/to/memory-mapped-file...
Downloading file /path/to/libfoo.so...
I think these messages are clearer than what we used to have, and they
are consistent in that we name the thing being downloaded in all
cases.
There is one tiny problem. The first case relies on GDB knowing the
name of the executable it wants to download. The only place we can
currently get that from is, I think, the memory-mapped file list.
[ ASIDE: There is `bfd_core_file_failing_command` which reports the
executable and argument list from the core file, but this
information is not ideal for this task. First, the executable and
arguments are merged into a single string, and second, the string is
a relatively short, fixed length string, so the executable name is
often truncated. For these reasons I don't consider fetching the
executable name using this bfd function as a solution. ]
We do have to consider the case that the core file does not have any
mapped file information. This shouldn't ever be the case for a Linux
target, but it's worth considering.
[ ASIDE: I mention Linux specifically because this only becomes a
problem if we try to do a lookup via debuginfod, which requires that
we have build-ids available. Linux has special support for
embedding build-ids into the core file, but I'm not sure if other
kernels do this. ]
For the unlikely edge case of a core-file that has build-ids, but
doesn't have any mapped file information then I propose that we
synthesis a filename like: 'with build-id xxxxxx'. We would then see
a message like:
Downloading file with build-id xxxxxx...
Where 'xxxxxx' would be replaced by the actual build-id.
This isn't ideal, but I think is good enough, and, as I said, I think
this case is not going to be hit very often, or maybe at all.
We already had some tests that emitted two of the above messages,
which I've updated, these cover the mapped-file and shared library
case.
The message about downloading the exec for the core-file is actually
really hard to trigger now as usually the exec will also appear in the
memory-mapped file list and GDB will download the file at this stage.
Then when GDB needs the executable for loading the symbols it'll ask
debuginfod, and debuginfod will find the file in its cache, and so no
message will be printed.
If anyone has any ideas about how to trigger this case then I'm happy
to add additional tests.
Approved-By: Tom Tromey <tom@tromey.com>
|
|
I saw a failure in gdb.debuginfod/build-id-no-debug-warning.exp which
I could only produce one time.
Normally the test output looks like this:
file /tmp/build/gdb/testsuite/outputs/gdb.debuginfod/build-id-no-debug-warning/.build-id/0c/30f589cc4f2c0fb22c8914d042ddf39c9a3885.debug
Reading symbols from /tmp/build/gdb/testsuite/outputs/gdb.debuginfod/build-id-no-debug-warning/.build-id/0c/30f589cc4f2c0fb22c8914d042ddf39c9a3885.debug...
Downloading separate debug info for /tmp/build/gdb/testsuite/outputs/gdb.debuginfod/build-id-no-debug-warning/.build-id/0c/30f589cc4f2c0fb22c8914d042ddf39c9a3885.debug...
Reading symbols from /tmp/build/gdb/testsuite/outputs/gdb.debuginfod/build-id-no-debug-warning/.client_cache/0c30f589cc4f2c0fb22c8914d042ddf39c9a3885/debuginfo...
(gdb) PASS: gdb.debuginfod/build-id-no-debug-warning.exp: local_debuginfod: debuginfod running, info downloaded, no war
But one time I saw this:
file /tmp/build/gdb/testsuite/outputs/gdb.debuginfod/build-id-no-debug-warning/.build-id/0c/30f589cc4f2c0fb22c8914d042ddf39c9a3885.debug
Reading symbols from /tmp/build/gdb/testsuite/outputs/gdb.debuginfod/build-id-no-debug-warning/.build-id/0c/30f589cc4f2c0fb22c8914d042ddf39c9a3885.debug...
Downloading 6.77 K separate debug info for /tmp/build/gdb/testsuite/outputs/gdb.debuginfod/build-id-no-debug-warning/.build-id/0c/30f589cc4f2c0fb22c8914d042ddf39c9a3885.debug...
Reading symbols from /tmp/build/gdb/testsuite/outputs/gdb.debuginfod/build-id-no-debug-warning/.client_cache/0c30f589cc4f2c0fb22c8914d042ddf39c9a3885/debuginfo...
(gdb) FAIL: gdb.debuginfod/build-id-no-debug-warning.exp: local_debuginfod: debuginfod running, info downloaded, no warnings
The difference is the "Downloading separate debug info for ..." line
has gained an extra '6.77 K' component. When I got the FAIL the
machine was under heavy load, so I suspect everything was running
pretty slow. I think the size is only added when the debuginfod
download is taking its time.
Anyway, the test in question is not expecting to see a size, which is
why it failed.
Every other debuginfod test does allow for an optional size being
printed, so lets update this test to also accept an optional size,
this should prevent failures like this in the future.
|
|
Add handling of '.' in gdb/contrib/spellcheck.sh.
While we're at, simplify the sed invocation by using a single s command
instead of 3 s commands.
Also introduce sed_join and grep_join.
Fix the following common misspellings:
...
bandwith -> bandwidth
emmitted -> emitted
immediatly -> immediately
suprize -> surprise
thru -> through
transfered -> transferred
...
Verified with shellcheck.
|
|
This changes a few implementations of "info proc mappings" to use
ui-out tables rather than printf.
Note that NetBSD and FreeBSD also use printfs here, but since I can't
test these, I didn't update them.
Approved-By: Andrew Burgess <aburgess@redhat.com>
|
|
Some of the gdb and testsuite files double include some headers. While
all headers use include guards, it helps a bit keeping the code base
tidy.
No functional change.
Approved-by: Kevin Buettner <kevinb@redhat.com>
|
|
There are 3 places where we currently call debuginfod_exec_query to
lookup an objfile for a given build-id.
In one of these places we first call build_id_to_exec_bfd which also
looks up an objfile given a build-id, but this function looks on disk
for a symlink in the .build-id/ sub-directory (within the
debug-file-directory).
I can't think of any reason why we shouldn't call build_id_to_exec_bfd
before every call to debuginfod_exec_query.
So, in this commit I have added a new function in build-id.c,
find_objfile_by_build_id, this function calls build_id_to_exec_bfd,
and if that fails, then calls debuginfod_exec_query.
Everywhere we call debuginfod_exec_query is updated to call the new
function, and in locate_exec_from_corefile_build_id, the existing call
to build_id_to_exec_bfd is removed as calling find_objfile_by_build_id
does this for us.
One slight weird thing is in core_target::build_file_mappings, here we
call find_objfile_by_build_id which returns a gdb_bfd_ref_ptr for the
opened file, however we immediately reopen the file as "binary". The
reason for this is that all the bfds opened in ::build_file_mappings
need to be opened as "binary" (see the function comments for why).
I did consider passing a target type into find_objfile_by_build_id,
which could then be forwarded to build_id_to_exec_bfd and used to open
the BFD as "binary", however, if you follow the call chain you'll end
up in build_id_to_debug_bfd_1, where we actually open the bfd. Notice
in here that we call build_id_verify to double check the build-id of
the file we found, this requires that the bfd not be opened as
"binary".
What this means is that we always have to first open the bfd using the
gnutarget target type (for the build-id check), and then we would have
to reopen it as "binary". There seems little point pushing the reopen
logic into find_objfile_by_build_id, so we just do this in the
::build_file_mappings function.
I've extended the tests to cover the two cases which actually changed
in this commit.
|
|
When GDB opens a core file, in 'core_target::build_file_mappings ()',
we collection information about the files that are mapped into the
core file, specifically, the build-id and the DT_SONAME attribute for
the file, which will be set for some shared libraries.
We then cache the DT_SONAME to build-id information on the core file
bfd object in the function set_cbfd_soname_build_id.
Later, when we are loading the shared libraries for the core file, we
can use the library's file name to look in the DT_SONAME to build-id
map, and, if we find a matching entry, we can use the build-id to
validate that we are loading the correct shared library.
This works OK, but has some limitations: not every shared library will
have a DT_SONAME attribute. Though it is good practice to add such an
attribute, it's not required. A library without this attribute will
not have its build-id checked, which can lead to GDB loading the wrong
shared library.
What I want to do in this commit is to improve GDB's ability to use
the build-ids extracted in core_target::build_file_mappings to both
validate the shared libraries being loaded, and then to use these
build-ids to potentially find (via debuginfod) the shared library.
To do this I propose making the following changes to GDB:
(1) Rather than just recording the DT_SONAME to build-id mapping in
set_cbfd_soname_build_id, we should also record, the full filename to
build-id mapping, and also the memory ranges to build-id mapping for
every memory range covered by every mapped file.
(2) Add a new callback solib_ops::find_solib_addr. This callback
takes a solib object and returns an (optional) address within the
inferior that is part of this library. We can use this address to
find a mapped file using the stored memory ranges which will increase
the cases in which a match can be found.
(3) Move the mapped file record keeping out of solib.c and into
corelow.c. Future commits will make use of this information from
other parts of GDB. This information was never solib specific, it
lived in the solib.c file because that was the only user of the data,
but really, the data is all about the core file, and should be stored
in core_target, other parts of GDB can then query this data as needed.
Now, when we load a shared library for a core file, we do the
following lookups:
1. Is the exact filename of the shared library found in the filename
to build-id map? If so then use this build-id for validation.
2. Find an address within the shared library using ::find_solib_addr
and then look for an entry in the mapped address to build-id map.
If an entry is found then use this build-id.
3. Finally, look in the soname to build-id map. If an entry is
found then use this build-id.
The addition of step #2 here means that GDB is now far more likely to
find a suitable build-id for a shared library. Having acquired a
build-id the existing code for using debuginfod to lookup a shared
library object can trigger more often.
On top of this, we also create a build-id to filename map. This is
useful as often a shared library is implemented as a symbolic link to
the actual shared library file. The mapped file information is stored
based on the actual, real file name, while the shared library
information holds the original symbolic link file name.
If when loading the shared library, we find the symbolic link has
disappeared, we can use the build-id to file name map to check if the
actual file is still around, if it is (and if the build-id matches)
then we can fall back to use that file. This is another way in which
we can slightly increase the chances that GDB will find the required
files when loading a core file.
Adding all of the above required pretty much a full rewrite of the
existing set_cbfd_soname_build_id function and the corresponding
get_cbfd_soname_build_id function, so I have taken the opportunity to
move the information caching out of solib.c and into corelow.c where
it is now accessed through the function core_target_find_mapped_file.
At this point the benefit of this move is not entirely obvious, though
I don't think the new location is significantly worse than where it
was originally. The benefit though is that the cached information is
no longer tied to the shared library loading code.
I already have a second set of patches (not in this series) that make
use of this caching from elsewhere in GDB. I've not included those
patches in this series as this series is already pretty big, but even
if those follow up patches don't arrive, I think the new location is
just as good as the original location.
Rather that caching the information within the core file BFD via the
registry mechanism, the information used for the mapped file lookup is
now stored within the core_file target directly.
|
|
This commit improves how GDB handles file backed mappings within a
core file, specifically, this is a restructuring of the function
core_target::build_file_mapping.
The primary motivation for this commit was to put in place the
infrastructure to support the next commit in this series, but this
commit does itself make some improvements.
Currently in core_target::build_file_mapping we use
gdbarch_read_core_file_mappings to iterate over the mapped regions
within a core file.
For each region a callback is invoked which is passed details of the
mapping; the file the mapping is from, the offset into the file, and
the address range at which the mapping exists. We are also passed the
build-id for the mapped file in some cases.
We are only told the build-id for the mapped region which actually
contains the ELF header of the mapped file. Other regions of the same
mapped ELF will not have the build-id passed to the callback.
Within core_target::build_file_mapping, in the per-region callback, we
try to find the mapped file based on its filename. If the file can't
be found, and if we have a build-id then we'll ask debuginfod to
download the file.
However we find the file, we cache the opened bfd object, which is
good. Subsequent mappings from the same file will not have a build-id
set, but by that point we already have a cached open bfd object, so
the lack of build-id is irrelevant.
The problem with the above is that if we find a matching file based on
the filename, then we accept that file, even if we have a build-id,
and the build-id doesn't match.
Currently, the mapped region processing is done in a single pass, we
call gdbarch_read_core_file_mappings, and for each mapping, as we see
it, we create the data structures needed to represent that mapping.
In this commit, I will change this to a two phase process. In the
first phase the mappings are grouped together based on the name of the
mapped file. At the end of phase one we have a 'struct mapped_file',
a new struct, for each mapped file. This struct associates an
optional build-id with a list of mapped regions.
In the second phase we try to find the file using its filename. If
the file is found, and the 'struct mapped_file' has a build-id, then
we'll compare the build-id with the file we found. This allows us to
reject on-disk files which have changed since the core file was
created.
If no suitable file was found (either no file found, or a build-id
mismatch) then we can use debuginfod to potentially download a
suitable file.
NOTE: In the future we could potentially add additional sanity
checks here, for example, if a data-file is mapped, and has no
build-id, we can estimate a minimum file size based on the expected
mappings. If the file we find is not big enough then we can reject
the on-disk file. But I don't know how useful this would actually
be, so I've not done that for now.
Having found (or not) a suitable file then we can create the data
structures for each mapped region just as we did before.
The new functionality here is the extra build-id check, and the
possibility of rejecting an on-disk file if the build-id doesn't
match.
This change could have been done within the existing single phase
approach I think, however, in the next approach I need to have all the
mapped regions associated with the expected build-id, and the new two
phase structure allows me to do that, this is the reason for such an
extensive rewrite in this commit.
There's a new test that exercises GDB's ability to find mapped files
via the build-id, and this downloading from debuginfod.
|
|
New 'no-delete-breakpoints' option for the 'runto' proc. This option
disables the delete_breakpoints call early on in this proc.
There are a couple of places in the testsuite where I have used:
proc no_delete_breakpoints {} {}
with_override delete_breakpoints no_delete_breakpoints {
if {![runto_main]} {
return
}
}
In order to avoid the deleting all breakpoints when I call
runto_main. I was about to add yet another instance of this pattern
and I figured that it's time to do this properly.
This commit adds the new option to 'runto' which causes the
delete_breakpoints call to be skipped.
And, we now forward any arguments from 'runto_main' through to
'runto', this means I can now just do:
if {![runto_main no-delete-breakpoints]} {
return
}
which I think is cleaner and easier to understand.
I've updated the two tests I found that use the old with_override
approach.
There should be no change in what is tested after this commit.
Approved-By: Tom Tromey <tom@tromey.com>
|
|
While writing a test I realised that the default behaviour of
gdb_gnu_strip_debug doesn't match its comment.
The comment says that the function takes a FILENAME, and splits the
file into FILENAME.stripped and FILENAME.debug, leaving FILENAME
unchanged. The comment says that a .gnu_debuglink will be added to
FILENAME.stripped.
However, this is not true, FILENAME.stripped is created, with no debug
information. FILENAME.debug is created containing the debug
information.
But, when adding the .gnu_debuglink we take FILENAME.stripped as the
input, and then overwrite FILENAME with the output. As a result,
FILENAME.stripped does not include a .gnu_debuglink, while FILENAME
contains the .gnu_debuglink and no debug information!
The users of gdb_gnu_strip_debug can be split into two groups, those
who are using the .gnu_debuglink, these tests are all written assuming
that FILENAME is updated.
Then there are some tests that only rely on gdb_gnu_strip_debug's
ability to split out the debug information, these tests are then going
to do a lookup based on the build-id, these tests don't require the
.gnu_debuglink. These tests use the FILENAME.stripped output file.
This all seems too confused to me.
As most uses of gdb_gnu_strip_debug assume that FILENAME is updated, I
propose that we just make that the actual, advertised behaviour of
this proc.
So now, gdb_gnu_strip_debug will take FILENAME, and will split the
debug information out into FILENAME.debug. The debug information will
then be stripped from FILENAME, and by default a .gnu_debuglink will
be added to FILENAME pointing to FILENAME.debug.
I've updated the two tests that actually relied on FILENAME.stripped
to instead just use FILENAME.
One of the tests was doing a build-id based lookup, but was still
allowing the .gnu_debuglink to be added to FILENAME, I've updated this
test to pass the no-debuglink flag to gdb_gnu_strip_debug, which stops
the .gnu_debuglink from being added.
All of the tests that call gdb_gnu_strip_debug still pass for me.
Acked-By: Tom de Vries <tdevries@suse.de>
|
|
This commit is the result of the following actions:
- Running gdb/copyright.py to update all of the copyright headers to
include 2024,
- Manually updating a few files the copyright.py script told me to
update, these files had copyright headers embedded within the
file,
- Regenerating gdbsupport/Makefile.in to refresh it's copyright
date,
- Using grep to find other files that still mentioned 2023. If
these files were updated last year from 2022 to 2023 then I've
updated them this year to 2024.
I'm sure I've probably missed some dates. Feel free to fix them up as
you spot them.
|
|
I ran across this site:
https://no-color.org/
... which lobbies for tools to recognize the NO_COLOR environment
variable and disable any terminal styling when it is seen.
This patch implements this for gdb.
Regression tested on x86-64 Fedora 38.
Co-Authored-By: Andrew Burgess <aburgess@redhat.com>
Reviewed-by: Kevin Buettner <kevinb@redhat.com>
Reviewed-By: Eli Zaretskii <eliz@gnu.org>
Approved-By: Andrew Burgess <aburgess@redhat.com>
|
|
After the commit:
commit 6647f05df023b63bbe056e9167e9e234172fa2ca
Date: Tue Jan 24 18:13:38 2023 +0100
gdb: defer warnings when loading separate debug files
It was pointed out[1] that the warnings being deferred and then later
emitted lacked styling. The warnings lacked styling before the above
commit, but it was suggested that the filenames in these warnings
should be styled, and this commit does this.
There were a couple of previous attempts[2][3][4] to solve this
problem, but these all tried to extend the mechanism introduced in the
above commit, the deferred warnings were placed directly into a
std::vector, but now we tried to, when appropriate, style these
warnings. The review feedback that this approach looked too complex.
So instead, this revision adds a new helper class 'deferred_warnings'
which can be used to collect a set of deferred warnings, and then emit
these deferred warnings later, if needed. This helper class hides the
complexity, so at the point the deferred warning is created no extra
logic is required.
The deferred_warnings class will style the deferred warnings only if
gdb_stderr supports styling. GDB's warnings are sent to gdb_stderr,
so this should ensure we only style when expected.
There was also review feedback[5] that all of the warnings should be
bundled into a single string_file, this has not been done. I feel
pretty strongly that separate warnings should be emitted using
separate "warning" calls. If we do end up with multiple warnings in
this case they aren't really related, one will be about looking up
debug via .gnu_debuglink, while the other will be about build-id based
lookup. So I'd really rather keep the warnings separate.
[1] https://inbox.sourceware.org/gdb-patches/87edr9pcku.fsf@tromey.com/
[2] https://inbox.sourceware.org/gdb-patches/20230216195604.2685177-1-ahajkova@redhat.com/
[3] https://inbox.sourceware.org/gdb-patches/20230217123547.2737612-1-ahajkova@redhat.com/
[4] https://inbox.sourceware.org/gdb-patches/20230320145638.1202335-1-ahajkova@redhat.com/
[5] https://inbox.sourceware.org/gdb-patches/87o7nh1g8h.fsf@tromey.com/
Co-Authored-By: Alexandra Hájková <ahajkova@redhat.com>
Approved-By: Simon Marchi <simon.marchi@efficios.com>
|
|
gdb's debuginfod progress messages include the size of the file being
downloaded if the size information is available at the time the message
is printed. For example:
Downloading 10 MB separate debug info for /lib64/libxyz.so
This size information is omitted if it's not available at the time of
printing:
Downloading separate debug info for /lib64/libxyz.so
A pattern in crc_mismatch.exp fails to be matched if a progress message
includes a file size. Add a wildcard to the pattern so that it matches
the progress message whether or not it includes the file size.
|
|
Tighten the expected output pattern in the test script:
gdb.debuginfod/build-id-no-debug-warning.exp
While working on some other patch I broke GDB such that this warning:
warning: "FILENAME": separate debug info file has no debug info
(which is generated in build-id.c) didn't actually include the
FILENAME any more -- yet this test script continued to pass. It turns
out that this script doesn't actually check for FILENAME.
This commit extends the test pattern to check for the full warning
string, including FILENAME, and also removes some uses of '.*' to make
the test stricter.
|
|
After running test-case gdb.debuginfod/crc_mismatch.exp, I find a dir called '$':
...
$ ls $build/gdb/testsuite/
$ config.log gdb.log lib outputs site.exp
cache config.status gdb.sum Makefile site.bak temp
...
Fix this by removing the stray '$' here:
...
set debugfile "$[standard_output_file ${testfile}.debug]"
...
Tested on x86_64-linux.
|
|
I noticed that the gdb.debuginfod/fetch_src_and_symbols.exp script
doesn't work with the native-gdbserver board, I see this error:
ERROR: tcl error sourcing /tmp/build/gdb/testsuite/../../../src/gdb/testsuite/gdb.debuginfod/fetch_src_and_symbols.exp.
ERROR: gdbserver does not support run without extended-remote
while executing
"error "gdbserver does not support $command without extended-remote""
(procedure "gdb_test_multiple" line 51)
invoked from within
This was introduced with this commit:
commit 7dd38e31d67c2548b52bea313ab18e40824c05da
Date: Fri Jan 6 18:45:27 2023 -0500
gdb/linespec.c: Fix missing source file during breakpoint re-set
The problem is that the above commit introduces a direct use of the
"run" command, which doesn't work with 'target remote' targets, as
exercised by the native-gdbserver board.
To avoid this, in this commit I switch to using runto_main. However,
calling runto_main will, by default, delete all the currently set
breakpoints. As the point of the above commit was to check that a
breakpoint set before stating an inferior would be correctly re-set,
we need to avoid this breakpoint deleting behaviour.
To do this I make use of with_override, and override the
delete_breakpoints proc with a dummy proc which does nothing.
By reverting the GDB changes in commit 7dd38e31d67c I have confirmed
that even after my changes in this commit, the test still fails. But
with the fixes in commit 7dd38e31d67c, this test now passed using the
unix, native-gdbserver, and native-extended-gdbserver boards.
|
|
Currently, when GDB loads debug information from a separate debug
file, there are a couple of warnings that could be produced if things
go wrong.
In find_separate_debug_file_by_buildid (build-id.c) GDB can give a
warning if the separate debug file doesn't include any actual debug
information, and in separate_debug_file_exists (symfile.c) we can warn
if the CRC checksum in the separate debug file doesn't match the
checksum in the original executable.
The problem here is that, when looking up debug information, GDB will
try several different approaches, lookup by build-id, lookup by
debug-link, and then a lookup from debuginfod. GDB can potentially
give a warning from an earlier attempt, and then succeed with a later
attempt. In the cases I have run into this is primarily a warning
about some out of date debug information on my machine, but then GDB
finds the correct information using debuginfod. This can be confusing
to a user, they will see warnings from GDB when really everything is
working just fine.
For example:
warning: the debug information found in "/usr/lib/debug//lib64/ld-2.32.so.debug" \
does not match "/lib64/ld-linux-x86-64.so.2" (CRC mismatch).
This diagnostic was printed on Fedora 33 even when the correct
debuginfo was downloaded.
In this patch I propose that we defer any warnings related to looking
up debug information from a separate debug file. If any of the
approaches are successful then GDB will not print any of the warnings.
As far as the user is concerned, everything "just worked". Only if
GDB completely fails to find any suitable debug information will the
warnings be printed.
The crc_mismatch test compiles two executables: crc_mismatch and
crc_mismatch-2 and then strips them of debuginfo creating separate
debug files. The test then replaces crc_mismatch-2.debug with
crc_mismatch.debug to trigger "CRC mismatch" warning. A local
debuginfod server is setup to supply the correct debug file, now when
GDB looks up the debug info no warning is given.
The build-id-no-debug-warning.exp is similar to the previous test. It
triggers the "separate debug info file has no debug info" warning by
replacing the build-id based .debug file with the stripped binary and
then loading it to GDB. It then also sets up local debuginfod server
with the correct debug file to download to make sure no warnings are
emitted.
|
|
This changes skip_debuginfod_tests to invert the sense, and renames it
to allow_debuginfod_tests.
|
|
This changes some tests to use "require !skip_debuginfod_tests".
|
|
During breakpoint re-setting, the source_filename of an
explicit_location_spec is used to lookup the symtabs associated with
the breakpoint being re-set. This source_filename is compared with each
known symtab filename in order to retrieve the breakpoint's symtabs.
However the source_filename may have been originally copied from a
symtab's fullname (the path where GDB found the source file) when the
breakpoint was first created. If a breakpoint symtab's filename and
fullname differ and there is no substitute-path rule that converts the
fullname to the filename, this will cause a NOT_FOUND_ERROR to be thrown
during re-setting.
Fix this by using a symtab's filename to set the explicit_location_spec
source_filename instead of the symtab's fullname.
|
|
This commit is the result of running the gdb/copyright.py script,
which automated the update of the copyright year range for all
source files managed by the GDB project to be updated to include
year 2023.
|
|
The gdb.debuginfod/fetch_src_and_symbols.exp test is showing a single
failure when run with some older versions of Clang, e.g. 9.0.1.
The problem appears to be with Clang's generated line table. The test
source looks like this:
int
main()
{
asm ("main_label: .globl main_label");
return 0;
}
In GDB, when we 'start', we expect to stop at the 'return 0;' line.
This is the behaviour when the compiler is gcc, or later versions of
Clang.
However, with Clang 9.0.2, I see GDB stop on the 'asm' line.
In this commit I'll fix this issue by placing a breakpoint on the
return line, and then using gdb_continue_to_breakpoint to ensure we
have stopped in the correct place.
Of course, using gdb_continue_to_breakpoint will only work if we are
not already stopped at the breakpoint location, so I've added some
filler work before the 'return 0;' line. With this done we can use
gdb_continue_to_breakpoint in all cases.
As a result of adding the new filler work, one of the later tests,
that used the 'list' command, no longer see the correct expected
output (the top line of the source file is no longer included in the
output). I've fixed this by listing a known specific line, the test
is checking that GDB managed to find the source file, it doesn't
matter which source line we list, as long as we can list something.
|
|
The test gdb.debuginfod/fetch_src_and_symbols.exp uses a source file
named main.c. I can't see any particular reason why the file is named
as such.
Usually test source files are named after the test script.
This commit just renames the source file inline with the test script,
and updates the call to standard_testfile (removing the reference to
main.c).
There's no particular reason for this change other than seeing the
file named main.c made me thing that the source file must be shared
with some other test (it isn't).
There should be no change in what is tested after this commit.
|
|
I noticed that the gdb.debuginfod/fetch_src_and_symbols.exp test was
failing when run with Clang as the compiler.
This test relies on the compiled binaries having a build-id within
them. For GCC, really GNU ld, the default is to always include a
build-id.
When compiling with Clang though, the default is for no build-id.
I did consider *always* turning on the build-id feature when the
compiler is Clang, but that felt a little weird.
Instead, I propose that we add a new 'build-id' compiler option to
gdb_compile, this flag indicates that the test _requires_ a build-id.
In gcc_compile we can then add the required flags if the compiler is
Clang so that we do get a build-id.
With this change the gdb.debuginfod/fetch_src_and_symbols.exp test
now (mostly) passes with Clang 9.0.1 and 15.0.2, and still passes with
gcc. The 'mostly' part is an unrelated issue, and will be addressed
in a later commit in this series.
Reviewed-By: Lancelot SIX <lancelot.six@amd.com>
|
|
With test-case gdb.debuginfod/fetch_src_and_symbols.exp and check-read1, I run
into:
...
(gdb) FAIL: gdb.debuginfod/fetch_src_and_symbols.exp: local_url: \
file fetch_src_and_symbols (got interactive prompt)
...
The problem is that this output:
...
Enable debuginfod for this session? (y or [n]) y^M
...
is matched using regexp "Enable debuginfod?.*" with matches only the first two
words of the output, after which an implicit clause in gdb_test_multiple triggers
on the second part containing the interactive prompt.
Fix this by included the interactive prompt in the regexp.
Tested on x86_64-linux.
|
|
native-gdbserver
When running test-case gdb.debuginfod/fetch_src_and_symbols.exp with target
board native-gdbserver, I get:
...
Running gdb.debuginfod/fetch_src_and_symbols.exp ...
ERROR: tcl error sourcing gdb.debuginfod/fetch_src_and_symbols.exp.
ERROR: gdbserver does not support start without extended-remote
while executing
"error "gdbserver does not support $command without extended-remote""
(procedure "gdb_test_multiple" line 51)
invoked from within
"gdb_test_multiple $command $message {*}$opts $user_code"
(procedure "gdb_test" line 56)
invoked from within
"gdb_test "start" "Temporary breakpoint.*""
...
Fix this by replacing gdb_test "start" with runto_main.
Tested on x86_64-linux.
|
|
We currently have a single test for GDB's debuginfod support, this is
gdb.debuginfod/fetch_src_and_symbols.exp, this script does all the
setup, starts debuginfod, and then does the testing.
This commit tries to split the existing script in two, there is a new
library lib/debuginfod-support.exp, which contains a helper functions
related to running debuginfod tests. All the code in the new library
is basically copied from the existing test case (which is why I
retained the copyright date range on the new library), with some minor
adjustments to try and make the code a little more generic.
One change I made, for example, is the library offers functions to
shut down debuginfod, previously we just relied on expect shutting
down debuginfod when dejagnu completed.
The existing test script is updated to make use of the new library
code, and this test is still passing for me. The only change in the
test results is a single test where I changed the name to remove the
port number from the test name - the port number can change from run
to run, so could make it hard to compare test results.
I have also done a little light house keeping on the original test
script, updating and adding new comments, and making use of
proc_with_prefix in a couple of places.
|
|
Currently debuginfod is disabled when the string of server URLs
is unset or set to be the empty string (via the $DEBUGINFOD_URLS
environment variable or the 'set debuginfod urls' gdb command).
Extend this functionality so that a whitespace-only URL also disables
debuginfod.
Modify a testcase to verify that a whitespace-only URL disables
debuginfod.
|
|
The gdb_test_multiple pattern for the "notice empty URL" test in
gdb.debuginfod/fetch_src_and_symbols.exp misses expecting the prompt.
Fix it by using -re -wrap.
Also, by using "confirm off", the message GDB prints if Debuginfod
downloading is available doesn't contain "Enable debuginfod" any
longer. E.g.:
~~~
(gdb) file testsuite/outputs/gdb.debuginfod/fetch_src_and_symbols/fetch_src_and_symbols
Reading symbols from testsuite/outputs/gdb.debuginfod/fetch_src_and_symbols/fetch_src_and_symbols...
This GDB supports auto-downloading debuginfo from the following URLs:
<http://localhost:123>
Enable debuginfod for this session? (y or [n])
~~~
~~~
(gdb) with confirm off -- file testsuite/outputs/gdb.debuginfod/fetch_src_and_symbols/fetch_src_and_symbols
Reading symbols from testsuite/outputs/gdb.debuginfod/fetch_src_and_symbols/fetch_src_and_symbols...
This GDB supports auto-downloading debuginfo from the following URLs:
<http://127.0.0.1:8000>
<127.0.0.1:8000>
Debuginfod has been disabled.
To make this setting permanent, add 'set debuginfod enabled off' to .gdbinit.
(No debugging symbols found in testsuite/outputs/gdb.debuginfod/fetch_src_and_symbols/fetch_src_and_symbols)
(gdb)
~~~
I handled that correctly in the other tests that use test_urls, but
had forgotten to update the "notice empty URL" one.
Change-Id: I00040c83466e1494b3875574eb009c571a1504bf
|
|
Trailing whitespace in the string of debuginfod URLs causes an
out_of_range exception during the printing of URLs for the first
use notice.
To fix this, stop printing URLs when the substring to be printed
consists only of whitespace.
Also add first use notice testcases.
Co-Authored-By: Pedro Alves <pedro@palves.net>
|
|
Add debuginfod support to core_target::build_file_mappings and
locate_exec_from_corefile_build_id to enable the downloading of
missing executables and shared libraries referenced in core files.
Also add debuginfod support to solib_map_sections so that previously
downloaded shared libraries can be retrieved from the local debuginfod
cache.
When core file shared libraries are found locally, verify that their
build-ids match the corresponding build-ids found in the core file.
If there is a mismatch, attempt to query debuginfod for the correct
build and print a warning if unsuccessful:
warning: Build-id of /lib64/libc.so.6 does not match core file.
Also disable debuginfod when gcore invokes gdb. Debuginfo is not
needed for core file generation so debuginfod queries will slow down
gcore unnecessarily.
|
|
This commit brings all the changes made by running gdb/copyright.py
as per GDB's Start of New Year Procedure.
For the avoidance of doubt, all changes in this commits were
performed by the script.
|
|
As discussed here [1], do some re-work in the "set debuginfod commands".
First, use "set debuginfod enabled on/off/ask" instead of "set
debuginfod on/off/ask". This is more MI-friendly, and it gives an
output that makes more sense in "info set", for example.
Then, make the show commands not call "error" when debuginfod support is
not compiled in. This makes the commands "show" and "show debuginfod"
stop early, breaking gdb.base/default.exp:
Running /home/smarchi/src/binutils-gdb/gdb/testsuite/gdb.base/default.exp ...
FAIL: gdb.base/default.exp: info set
FAIL: gdb.base/default.exp: show
- Make the "debuginfod enabled" setting default to "off" when debuginfod
support is not compiled in, and "ask" otherwise.
- Make the setter of "debuginfod enabled" error out when debuginfod
support is not compiled in, so that "debuginfod enabled" will always
remain "off" in that case.
- Make the setter of "debuginfod verbose" work in any case. I don't
see the harm in letting the user change that setting, since the user will
hit an error if they try to enable the use of debuginfod.
- I would do the same for the "debuginfod urls" setter, but because
this one needs to see the DEBUGINFOD_URLS_ENV_VAR macro, provided by
libdebuginfod, I made that one error out as well if debuginfod
support is not compiled it (otherwise, I would have left it like
"debuginfod verbose". Alternatively, we could hard-code
"DEBUGINFOD_URLS" in the code (in fact, it was prior to this patch,
but I think it was an oversight, as other spots use
DEBUGINFOD_URLS_ENV_VAR), or use a dummy string to store the setting,
but I don't really see the value in that.
Rename debuginfod_enable to debuginfod_enabled, just so it matches the
setting name.
[1] https://sourceware.org/pipermail/gdb-patches/2021-October/182937.html
Change-Id: I45fdb2993f668226a5639228951362b7800f09d5
Co-Authored-By: Aaron Merey <amerey@redhat.com>
|
|
AddressSanitizer
This test fails for me, showing:
ERROR: tcl error sourcing /home/smarchi/src/binutils-gdb/gdb/testsuite/gdb.debuginfod/fetch_src_and_symbols.exp.
ERROR: This GDB was configured as follows:
configure --host=x86_64-pc-linux-gnu --target=x86_64-pc-linux-gnu
--with-auto-load-dir=$debugdir:$datadir/auto-load
--with-auto-load-safe-path=$debugdir:$datadir/auto-load
... and much more ...
The problem is that TCL's exec throws an error as soon as the exec'ed
process outputs on stderr. When GDB is built with ASan, it prints some
warnings about pre-existing signal handlers:
warning: Found custom handler for signal 7 (Bus error) preinstalled.
warning: Found custom handler for signal 8 (Floating point exception) preinstalled.
warning: Found custom handler for signal 11 (Segmentation fault) preinstalled.
Pass --quiet to GDB to avoid these warnings.
Change-Id: I3751d89b9b1df646da19149d7cb86775e2d3e80f
|
|
Add 'set debuginfod' command. Accepts 'on', 'off' or 'ask' as an
argument. 'on' enables debuginfod for the current session. 'off'
disables debuginfod for the current session. 'ask' will prompt
the user to either enable or disable debuginfod when the next query
is about to be performed:
This GDB supports auto-downloading debuginfo from the following URLs:
<URL1> <URL2> ...
Enable debuginfod for this session? (y or [n]) y
Debuginfod has been enabled.
To make this setting permanent, add 'set debuginfod on' to .gdbinit.
For interactive sessions, 'ask' is the default. For non-interactive
sessions, 'off' is the default.
Add 'show debuginfod status' command. Displays whether debuginfod
is set to 'on', 'off' or 'ask'.
Add 'set/show debuginfod urls' commands. Accepts a string of
space-separated debuginfod server URLs to be queried. The default
value is copied from the DEBUGINFOD_URLS environment variable.
Finally add 'set/show debuginfod verbose' commands to control whether
debuginfod-related output is displayed. Verbose output is enabled
by default.
(gdb) run
Starting program: /bin/sleep 5
Download failed: No route to host. Continuing without debug info for /lib64/libc.so.6.
If GDB is not built with debuginfod then these commands will just display
Support for debuginfod is not compiled into GDB.
|
|
On OBS I ran into this failure with test-case
gdb.debuginfod/fetch_src_and_symbols.exp:
...
Failed to listen for connections: Address already in use^M
[Thu Oct 21 11:48:49 2021] (559/559): started http server on IPv6 port=8000^M
...
FAIL: gdb.debuginfod/fetch_src_and_symbols.exp: local_url: find port timeout
...
The test-case is trying to start debuginfod on a port to see if it's
available, and it handles either this message:
"started http server on IPv4 IPv6 port=$port"
meaning success, or:
"failed to bind to port"
meaning failure, in which case the debuginfod instance is killed, and we try
the next port.
The test-case only uses the v4 address 127.0.0.1, so fix this by:
- accepting "started http server on IPv4 port=$port"
- rejecting "started http server on IPv6 port=$port"
Tested on x86_64-linux.
|
|
With running test-case gdb.debuginfod/fetch_src_and_symbols.exp with target
board unix/-bad, I get:
...
gcc: error: unrecognized command line option '-bad'^M
compiler exited with status 1
gdb compile failed, gcc: error: unrecognized command line option '-bad'
FAIL: gdb.debuginfod/fetch_src_and_symbols.exp: compile
...
Replace the FAIL with the usual:
...
UNTESTED: gdb.debuginfod/fetch_src_and_symbols.exp: failed to compile
...
Tested on x86_64-linux.
|
|
This commits the result of running gdb/copyright.py as per our Start
of New Year procedure...
gdb/ChangeLog
Update copyright year range in copyright header of all GDB files.
|
|
Test-case gdb.debuginfod/fetch_src_and_symbols.exp leaks env vars
DEBUGINFOD_URLS, DEBUGINFOD_TIMEOUT and DEBUGINFOD_CACHE_PATH, causing
timeouts in subsequent tests.
Fix this by using save_vars. Also, fix PATH and DUPLICATE errors. Finally,
cleanup whitespace.
gdb/testsuite/ChangeLog:
2020-07-21 Tom de Vries <tdevries@suse.de>
* gdb.debuginfod/fetch_src_and_symbols.exp: Use save_vars for env
vars. Fix PATH and DUPLICATE errors. Cleanup whitespace.
|
|
gdb.debuginfod/fetch_src_and_symbols.exp attempts to ascertain
whether GDB was built with debuginfod support by executing
"$GDB --configuration".
That seems harmless enough. However, if GDB is not already installed
on the host, the command will fail:
$ ./gdb --config
Exception caught while booting Guile.
Error in function "open-file":
No such file or directory: "/usr/share/gdb/guile/gdb/boot.scm"
./gdb: warning: Could not complete Guile gdb module initialization from:
/usr/share/gdb/guile/gdb/boot.scm.
Limited Guile support is available.
Suggest passing --data-directory=/path/to/gdb/data-directory.
Python Exception <class 'ModuleNotFoundError'> No module named 'gdb':
./gdb: warning:
Could not load the Python gdb module from `/usr/share/gdb/python'.
Limited Python support is available from the _gdb module.
Suggest passing --data-directory=/path/to/gdb/data-directory.
This GDB was configured as follows:
configure --host=x86_64-redhat-linux-gnu --target=x86_64-redhat-linux-gnu
[abbreviated output]
The problem here is, of course, that while running in the test suite,
we must pass INTERNAL_GDBFLAGS in order to pick up the --data-directory
option.
gdb/testsuite/ChangeLog
2020-06-17 Keith Seitz <keiths@redhat.com>
* gdb.deuginfod/fetch_src_and_symbols.exp: Pass INTERNAL_GDBFLAGS
when executing "gdb --configuration".
|
|
debuginfod is a lightweight web service that indexes ELF/DWARF debugging
resources by build-id and serves them over HTTP.
This patch enables GDB to query debuginfod servers for separate debug
files and source code when it is otherwise not able to find them.
GDB can be built with debuginfod using the --with-debuginfod configure
option.
This requires that libdebuginfod be installed and found at configure time.
debuginfod is packaged with elfutils, starting with version 0.178.
For more information see https://sourceware.org/elfutils/.
Tested on x86_64 Fedora 31.
gdb/ChangeLog:
2020-02-26 Aaron Merey <amerey@redhat.com>
* Makefile.in: Handle optional debuginfod support.
* NEWS: Update.
* README: Add --with-debuginfod summary.
* config.in: Regenerate.
* configure: Regenerate.
* configure.ac: Handle optional debuginfod support.
* debuginfod-support.c: debuginfod helper functions.
* debuginfod-support.h: Ditto.
* doc/gdb.texinfo: Add --with-debuginfod to configure options
summary.
* dwarf2/read.c (dwarf2_get_dwz_file): Query debuginfod servers
when a dwz file cannot be found.
* elfread.c (elf_symfile_read): Query debuginfod servers when a
debuginfo file cannot be found.
* source.c (open_source_file): Query debuginfod servers when a
source file cannot be found.
* top.c (print_gdb_configuration): Include
--{with,without}-debuginfod in the output.
gdb/testsuite/ChangeLog:
2020-02-26 Aaron Merey <amerey@redhat.com>
* gdb.debuginfod: New directory for debuginfod tests.
* gdb.debuginfod/main.c: New test file.
* gdb.debuginfod/fetch_src_and_symbols.exp: New tests.
|
