Add support for DWARF debug info usage for kernel module address symbolization #1391
Conversation
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
danielocfb
force-pushed
the
topic/kernel-mod-syms
branch
4 times, most recently
from
5941d58 to
a2e3f78
Compare
d-e-s-o
force-pushed
the
topic/kernel-mod-syms
branch
3 times, most recently
from
8ee174e to
ace6526
Compare
Add a parser for /proc/modules style files, ModMap. /proc/modules contains information about memory ranges of modules. We need such information in order to understand which module a given kernel address belongs to. On top of just parsing contents, objects of this type provide the means for querying the module name that an address belongs to, if any. Signed-off-by: Daniel Müller <deso@posteo.net>
Add logic for parsing depmod binary files. These files basically contain a search tree for efficiently looking up module paths (relative to a base directory) given a module name. Making such a lookup possible enables the loading of module binaries, which may contain DWARF debug information for symbolization that resolves source code information (as opposed to /proc/kallsyms, which only has limited function granularity for addresses). Signed-off-by: Daniel Müller <deso@posteo.net>
Add support for looking up and incorporating DWARF information for symbolization of kernel module addresses. So far we have only supported using DWARF for addresses belonging to the core kernel. We rely on the previously introduced /proc/modules map for deciding whether an address belongs to a kernel module. We then use the depmod file for looking up the kernel module, optionally taking into account debug links as usual. Signed-off-by: Daniel Müller <deso@posteo.net>
d-e-s-o
force-pushed
the
topic/kernel-mod-syms
branch
from
ace6526 to
c724915
Compare
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
2 participants
Add this suggestion to a batch that can be applied as a single commit.
This suggestion is invalid because no changes were made to the code.
Suggestions cannot be applied while the pull request is closed.
Suggestions cannot be applied while viewing a subset of changes.
Only one suggestion per line can be applied in a batch.
Add this suggestion to a batch that can be applied as a single commit.
Applying suggestions on deleted lines is not supported.
You must change the existing code in this line in order to create a valid suggestion.
Outdated suggestions cannot be applied.
This suggestion has been applied or marked resolved.
Suggestions cannot be applied from pending reviews.
Suggestions cannot be applied on multi-line comments.
Suggestions cannot be applied while the pull request is queued to merge.
Suggestion cannot be applied right now. Please check back later.
Please see individual commits for descriptions.