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Dodji Seketeli ad8c2531fb Bug 24431 - ELF reader can't interpret ksymtab with Kernel 4.19+ 
Since the commit
7290d58095
of the kernel, the format of the ksymtab section changed, so the ELF
reader of Libabigail cannot get the list of kernel symbols that are
meaningful to analyze.

In the new format, each ksymtab entry is now 32 bits length,
independently of if the kernel was built in 32 or 64 bits mode.  This
way, 64 bit kernels save 32 bits per entry, from the ksymtab section
alone.

Also, note that the symbol address in the ksymtab entry is stored in a
"place-relative address" format.  That means for a given symbol value
'Sym_Addr', the value which is stored at a given offset 'Off' of the
ksymtab secthion which address is Ksymtab_Addr is:

  Sym_Addr - Ksymtab_Addr - Off.

This is what is meant by storing Sym_Addr in a "place-relative" manner.

One advantage, of course, is to make Sym_Addr take 32 bits, even on a
64 bits arch.  Another advantage is that the resulting value doesn't
need to be relocated!  So we don't need any relocation section either!
So lots of space saving.

This patch teaches the ELF reader into this new format.

	* src/abg-dwarf-reader.cc (enum kernel_symbol_table_kind): Move this
	enum at the top.
	(enum ksymtab_format): Define new enum.
	(read_context::{ksymtab_format_, ksymtab_entry_size_,
	nb_ksymtab_entries_, nb_ksymtab_gpl_entries_}): Define new data
	members.
	(read_context::initiliaze): Initialize the new data members above.
	(read_context::{get_ksymtab_format, get_ksymtab_symbol_value_size,
	get_ksymtab_entry_size, get_nb_ksymtab_entries,
	get_nb_ksymtab_gpl_entries,
	maybe_adjust_sym_address_from_v4_19_ksymtab}): Define new member
	functions.
	(read_context::load_kernel_symbol_table): Support loading from
	both pre and post v4.19 linux kernels with their different ksymtab
	formats.  Add more comments.

Signed-off-by: Dodji Seketeli <dodji@redhat.com>
2019-04-16 14:06:26 +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 Bug 24430 - Fold away const for array types 2019-04-10 13:02:36 +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 can't interpret ksymtab with Kernel 4.19+ 2019-04-16 14:06:26 +02:00
tests Bug 24430 - Fold away const for array types 2019-04-10 13:02:36 +02:00
tools Separate public types of first binary from those of the second 2019-01-16 12:27:45 +01:00
.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.