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Dodji Seketeli f9b2f37512 Bug 24431 - ELF reader fails to determine __ksymtab format 
This is a fallout from this commit:

 ad8c253 Bug 24431 - ELF reader can't interpret ksymtab with Kernel 4.19+

The problem is that the method used to determine if the format of the
__ksymtab section is pre or post v4.19.  In that commit, we assumed
that a kernel without relocations for the __ksymtab section implies a
v4.19 format, because in that format, we don't need relocations for
that section.  But then it can happen that the entire kernel be built
without relocations, in the case a non relocatable kernels.  So just
looking a the presence of relocations is not a good enough
discriminant to determine the format of the __ksymtab section.

This patch rather tries to read the first entry of the __ksymtab
section assuming a pre v4.19 format, comes up with an address, and
then looks the .symtab section up with that address.  If the lookup
succeeds and we find a symbol, then we can reasonably assume that the
__ksymtab section is in the v4.19 format.  Otherwise, we do the same
assuming a v4.19 format, etc.

Tested on v4.9, v4.16 and v4.16 kernels in 32 and 64 bits.

	* src/abg-dwarf-reader.cc
	(read_context::{try_reading_first_ksymtab_entry_using_pre_v4_19_format,
	try_reading_first_ksymtab_entry_using_v4_19_format}): Define new
	member functions.
	(read_context::maybe_adjust_sym_address_from_v4_19_ksymtab): Make
	member function this const.
	(read_context::get_ksymtab_format): Implement the new heuristic
	here, using try_reading_first_ksymtab_entry_using_pre_v4_19_format
	and try_reading_first_ksymtab_entry_using_v4_19_format, rather
	than assuming that if we have no relocations, then we are in the
	v4.19 format.
	(maybe_adjust_sym_address_from_v4_19_ksymtab): When on a 64 bits
	architecture, ensure the 32 bits address read from the v4.19
	format __ksymtab section is converted into a 64 bits address.

Signed-off-by: Dodji Seketeli <dodji@redhat.com>
2019-04-17 07:54:29 +02:00
autoconf-archive Do not ignore valgrind checks returning an error 2017-02-27 10:01:15 +01:00
bash-completion Add --self-compare option in fedabipkgdiff 2017-05-31 16:21:14 +05:30
doc Update website mainpage for 1.6 release 2019-03-29 17:31:33 +01:00
include viz-dot: remove unused members from dot 2019-04-16 16:11:01 +02:00
m4 Delete ltsugar.m4 and pkg.m4 files from m4/ 2015-01-06 09:54:45 +01:00
scripts Clean up scripts/* 2017-04-14 04:14:12 -04:00
src Bug 24431 - ELF reader fails to determine __ksymtab format 2019-04-17 07:54:29 +02:00
tests Update .gitignore files to ignore typical dev side products 2019-04-16 16:32:52 +02:00
tools Update .gitignore files to ignore typical dev side products 2019-04-16 16:32:52 +02:00
.gitignore Bug 22722 - Make fedabipkgdiff and its tests support both python 3 and 2 2018-03-29 13:46:50 +02:00
abigail.m4 For usage from within GCC set header path to $includedir/libabigail 2013-08-14 16:10:15 +02:00
AUTHORS Initial AUTHORS and README 2013-02-28 13:25:20 +01:00
ChangeLog Update ChangeLog 2019-03-27 18:39:08 +01:00
COMMIT-LOG-GUIDELINES Update the COMMIT-LOG-GUIDELINES file 2016-05-22 23:20:12 +02:00
COMPILING Some documentation fixes 2018-12-07 11:21:50 +01:00
configure.ac Bump version number to 1.7 2019-03-29 17:32:06 +01:00
CONTRIBUTING Control symbols exported from libabigail.so 2016-07-27 12:51:02 +02:00
COPYING Use a better wording for the COPYING file 2015-04-22 09:53:18 +02:00
COPYING-GPLV3 Update licence texts 2015-04-20 13:51:21 +02:00
COPYING-LGPLV2 Initial import of gen-changelog.py 2014-11-18 23:18:06 +01:00
COPYING-LGPLV3 LGPLv3 License the library 2013-07-23 23:13:55 +02:00
default.abignore Add default suppression specification for the libvirt project 2018-10-11 10:59:54 +02:00
gen-changelog.py [gen-changelog] Make subject line always come first 2014-11-18 23:18:06 +01:00
install-sh Add missing autoconfiscation files into version control 2013-03-01 00:47:49 +01:00
libabigail.pc.in Make libxml2 a private dependency wrt pkconfig 2013-08-22 17:41:29 +02:00
ltmain.sh Add missing autoconfiscation files into version control 2013-03-01 00:47:49 +01:00
Makefile.am Make the "upload-release" target be usable in parallel 2018-03-06 18:08:22 +01:00
NEWS Update NEWS file for 1.6 2019-03-27 18:36:53 +01:00
README Fix wording in README 2015-09-05 10:30:00 +02:00
release-text-template.txt Update the release text template after 1.0 2017-11-22 15:55:43 +01:00
update-copyright.sh Update copyright for 2019 2019-01-07 14:54:47 +01:00
VISIBILITY Control symbols exported from libabigail.so 2016-07-27 12:51:02 +02:00

README 

This is the Application Binary Interface Generic Analysis and
Instrumentation Library.

It aims at constructing, manipulating, serializing and de-serializing
ABI-relevant artifacts.

The set of artifacts that we are intersted is made of quantities like
types, variable, fonctions and declarations of a given library or
program.  For a given library or program this set of quantities is
called an ABI corpus.

This library aims at (among other things) providing a way to compare
two ABI Corpora (apparently the plural of corpus is copora, heh,
that's cool), provide detailed information about their differences,
and help build tools to infer interesting conclusions about these
differences.

You are welcome to contribute to this project after reading the files
CONTRIBUTING and COMMIT-LOG-GUIDELINES files in the source tree.

Communicating with the maintainers of this project -- including
sending patches to be include to the source code -- happens via email
at libabigail@sourceware.org.