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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
contrib
cpu
elfcpp
etc
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
gold
gprof
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
ld ld: print branch fixups into the map file for ppc elf targets 2023-11-08 09:07:02 +01:00
libbacktrace
libctf
libdecnumber
libiberty
libsframe
opcodes aarch64: Fix error in THE system register checking 2023-11-09 13:37:33 +00:00
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