https://sourceware.org/bugzilla/show_bug.cgi?id=30930
--- Comment #25 from Szabolcs Nagy <nsz at gcc dot gnu.org> ---
for the record i built a mame binary where
$ readelf -aW mame |grep
_ZN3emu6detail16device_registrar15register_deviceERNS0_21device_type_impl_baseE
885688: 00000000084323c8 12 FUNC LOCAL DEFAULT 14
___ZN3emu6detail16device_registrar15register_deviceERNS0_21device_type_impl_baseE_bti_veneer
1532712: 000000000964dc40 120 FUNC GLOBAL DEFAULT 14
_ZN3emu6detail16device_registrar15register_deviceERNS0_21device_type_impl_baseE
$ objdump -d mame |grep -A5
'_ZN3emu6detail16device_registrar15register_deviceERNS0_21device_type_impl_baseE_bti_veneer>:'
00000000084323c8
<___ZN3emu6detail16device_registrar15register_deviceERNS0_21device_type_impl_baseE_bti_veneer>:
84323c8: 90000010 adrp x16, 8432000
<___ZN24device_execute_interface7suspendEjb_bti_veneer+0x10>
84323cc: 910f2210 add x16, x16, #0x3c8
84323d0: d61f0200 br x16
...
$ objdump -d mame |grep -A4
'_ZN3emu6detail16device_registrar15register_deviceERNS0_21device_type_impl_baseE>:'
000000000c35b570
<_ZN3emu6detail16device_registrar15register_deviceERNS0_21device_type_impl_baseE>:
c35b570: d503245f bti c
c35b574: b0045701 adrp x1, 14e3c000
<_ZN34option_guide_impl_dsk_option_guideL6actualE+0x10>
c35b578: d503233f paciasp
c35b57c: a9bf7bfd stp x29, x30, [sp, #-16]!
this is broken in multiple ways:
- there is no *_veneer, only *_bti_veneer and
- *_bti_veneer is global symbol (not local)
- the code of the bti veneer is not the expected "bti c; b target" but an adrp
veneer that calls itself.
- bti veneer should not be emitted as the target has bti (opened bug 30957 )
and
- '_veneer' and '_bti_veneer' are attached to the symbol version instead of the
symbol (not sure yet if this causes problems), e.g.:
00000000005775b8 <___ZNSirsERi@@GLIBCXX_3.4_bti_veneer>:
5775b8: d503245f bti c
5775bc: 17ffedbd b 572cb0 <_ZNSirsERi@plt>
(it will take a few more days for me before i can look at it so i record the
issues in case somebody else has an idea what's going on)
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