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From: "jrmuizel at gmail dot com" <sourceware-bugzilla@sourceware.org>
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Subject: [Bug tdep/27789] backtraces through unknown functions on m68k are
 broken
Date: Thu, 29 Apr 2021 23:19:50 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D27789

--- Comment #6 from Jeff Muizelaar <jrmuizel at gmail dot com> ---
It's possible to just load the attached core file with a gdb that targets
m68k-linux (like ubuntu's gdb-multiarch)

gdb -c core
GNU gdb (GDB) 10.2
Copyright (C) 2021 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.htm=
l>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.
Type "show copying" and "show warranty" for details.
This GDB was configured as "--host=3Dx86_64-pc-linux-gnu
--target=3Dm68k-linux-gnu".
Type "show configuration" for configuration details.
For bug reporting instructions, please see:
<https://www.gnu.org/software/gdb/bugs/>.
Find the GDB manual and other documentation resources online at:
    <http://www.gnu.org/software/gdb/documentation/>.

For help, type "help".
Type "apropos word" to search for commands related to "word".

warning: Can't open file /root/a.out during file-backed mapping note proces=
sing

warning: Can't open file /usr/lib/m68k-linux-gnu/ld-2.31.so during file-bac=
ked
mapping note processing

warning: Can't open file /usr/lib/m68k-linux-gnu/libc-2.31.so during
file-backed mapping note processing
[New LWP 395]
Core was generated by `./a.out'.
Program terminated with signal SIGSEGV, Segmentation fault.
#0  0x800003be in ?? ()
(gdb) bt
#0  0x800003be in ?? ()
#1  0xeff50c44 in ?? ()
#2  0x800003da in ?? ()
#3  0x00000004 in ?? ()
#4  0xeff50c50 in ?? ()
#5  0x800003ec in ?? ()
#6  0x00000000 in ?? ()
(gdb) q

notice the garbage frames: 1, 3, 4 and 6

Applying the attached patch which does the same thing as
7618e12bcb8f15e83c8c6abc5216f520f09bdbf9 gives:

(gdb) bt
#0  0x800003be in ?? ()
#1  0x800003da in ?? ()
#2  0x800003ec in ?? ()
#3  0x80000408 in ?? ()
#4  0xc004a902 in ?? ()
#5  0x80000346 in ?? ()

--=20
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