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Szabolcs Nagy d3a8dfdef0 bfd: aarch64: Fix broken BTI stub PR30930
Input sections are grouped together that can use the same stub area
(within reach) and these groups have a stable id.

Stubs have a name generated from the stub group id and target symbol.
When a relocation requires a stub with a name that already exists, the
stub is reused instead of adding a new one.

For an indirect branch stub another BTI stub may be inserted near the
target to provide a BTI landing pad.

The BTI stub can end up with the same stub group id and thus the same
name as the indirect stub. This happens if the target symbol is within
reach of the indirect branch stub. Then, due to the name collision,
only a single stub was emmitted which branched to itself causing an
infinite loop at runtime.

A possible solution is to just name the BTI stubs differently, but
since in the problematic case the indirect and BTI stub are in the
same stub area, a better solution is to emit a single stub with a
direct branch. The stub is still needed since the caller cannot reach
the target directly and we also want a BTI landing pad in the stub in
case other indirect stubs target the same symbol and thus need a BTI
stub.

In short we convert an indirect branch stub into a BTI stub when the
target is within reach and has no BTI. It is a hassle to change the
symbol of the stub so a BTI stub may end up with *_veneer instead of
*_bti_veneer after the conversion, but this should not matter much.
(Refactoring some of _bfd_aarch64_add_call_stub_entries would be
useful but too much for this bug fix patch.)

The same conversion to direct branch could be done even if the target
did not need a BTI. The stub groups are fixed in the current logic so
linking can fail if too many stubs are inserted and the section layout
is changed too much, but this only happens in extreme cases that can
be reasonably ignored. Because of this the target cannot go out of
reach during stub insertion so the optimization is valid, but not
implemented by this patch for the non-BTI case.

Fixes bug 30930.
2023-11-09 14:44:37 +00:00
bfd bfd: aarch64: Fix broken BTI stub PR30930 2023-11-09 14:44:37 +00:00
binutils [readelf] Handle unknown name of main in .gdb_index section 2023-10-24 12:35:08 +02:00
config config/debuginfod.m4: Add check for libdebuginfod 0.188 2023-09-27 15:11:13 -04:00
contrib Import mklog.py from gcc repo 2020-09-25 10:24:44 -04:00
cpu sim --enable-cgen-maint 2023-08-19 12:41:32 +09:30
elfcpp Add markers for the 2.41 branch 2023-07-03 11:12:15 +01:00
etc Update year range in gprofng copyright notices 2023-01-01 23:26:30 +10:30
gas aarch64: Fix error in THE system register checking 2023-11-09 13:37:33 +00:00
gdb rs6000, Fix test gdb.base/store.exp 2023-11-08 11:36:07 -05:00
gdbserver Remove EXTERN_C and related defines 2023-11-06 20:31:12 -07:00
gdbsupport Remove EXTERN_C and related defines 2023-11-06 20:31:12 -07:00
gnulib Add missing backslash to update-gnulib.sh 2023-06-21 08:47:05 -06:00
gold gold: Use char16_t, char32_t instead of uint16_t, uint32_t as character types 2023-09-06 17:20:20 -07:00
gprof regen config 2023-08-12 10:27:57 +09:30
gprofng gprofng: remove dependency on help2man 2023-11-01 19:25:06 -07:00
include aarch64: Add arch support for LSE128 extension 2023-11-07 21:54:19 +00:00
intl regen config 2023-08-12 10:27:57 +09:30
ld ld: print branch fixups into the map file for ppc elf targets 2023-11-08 09:07:02 +01:00
libbacktrace regen config 2023-08-12 10:27:57 +09:30
libctf libctf: fix creation-time parent/child dict confusions 2023-10-20 18:09:54 +01:00
libdecnumber regen config 2023-08-12 10:27:57 +09:30
libiberty Synchromize libiberty sources with master version in gcc repository 2023-06-26 15:47:15 +01:00
libsframe regen config 2023-08-12 10:27:57 +09:30
opcodes aarch64: Fix error in THE system register checking 2023-11-09 13:37:33 +00:00
readline [readline] Fix double free in _rl_scxt_dispose 2023-05-28 10:17:57 +02:00
sim sim/riscv: fix JALR instruction simulation 2023-10-18 17:55:31 +01:00
texinfo
zlib regen config 2023-08-12 10:27:57 +09:30
.cvsignore
.editorconfig Add top-level .editorconfig file 2022-01-28 08:25:42 -05:00
.gitattributes binutils-gdb/git: highlight whitespace errors in source files 2022-07-25 14:35:41 +01:00
.gitignore Add gnu global outputs to .gitignore 2020-12-02 10:00:27 -05:00
ar-lib
ChangeLog Revert "2.41 Release sources" 2023-08-02 12:06:23 +01:00
compile
config-ml.in MSP430: Add -fno-exceptions multilib 2023-08-12 10:24:26 +09:30
config.guess kvx: New port. 2023-08-16 14:22:54 +01:00
config.rpath
config.sub kvx: New port. 2023-08-16 14:22:54 +01:00
configure generated bfd files, and kvx regen 2023-08-17 21:44:04 +09:30
configure.ac kvx: New port. 2023-08-16 14:22:54 +01:00
COPYING
COPYING3
COPYING3.LIB
COPYING.LIB
COPYING.LIBGLOSS
COPYING.NEWLIB
depcomp
djunpack.bat
install-sh
libtool.m4 FDPIC: Handle arm*-*-uclinuxfdpiceabi in configure scripts 2023-08-12 10:25:06 +09:30
lt~obsolete.m4
ltgcc.m4
ltmain.sh Do not use HAVE_DOS_BASED_FILE_SYSTEM for Cygwin. 2023-08-12 10:25:06 +09:30
ltoptions.m4
ltsugar.m4
ltversion.m4
MAINTAINERS MAINTAINERS: Update path to readline config.{sub,guess} files 2021-05-24 18:11:49 +02:00
Makefile.def sim: add distclean dep for gnulib 2023-10-15 23:00:33 +05:45
Makefile.in sim: add distclean dep for gnulib 2023-10-15 23:00:33 +05:45
Makefile.tpl toplevel: Substitute GDCFLAGS instead of using CFLAGS 2023-08-12 10:27:44 +09:30
makefile.vms
missing
mkdep
mkinstalldirs
move-if-change
multilib.am
README
README-maintainer-mode Note that at least dejagnu version 1.5.3 is required in order to be ale to run the testsuites. 2022-10-04 10:54:19 +01:00
SECURITY.txt Add a SECURITY.txt file describing the GNU Binutils' project's stance on security related bugs. 2023-04-20 16:52:11 +01:00
setup.com
src-release.sh src-release.sh (SIM_SUPPORT_DIRS): Add libsframe, libctf/swap.h and gnulib 2023-09-06 04:15:23 +02:00
symlink-tree
test-driver
ylwrap

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