unknown error after dwarf_cfi_addrframe()

[Sasha Da Rocha Pinheiro]

Below I copy gdb execution from eblopenbackend.c trying to dlopen a dsoname "libebl_x86_64.so".
After that it will try to open again, which find something, but culminates to closing it with (void) dlclose (h);


(gdb) n
328		void *h = dlopen (dsoname, RTLD_LAZY);
(gdb) p dsonmae
No symbol "dsonmae" in current context.
(gdb) p dsoname
$97 = "$ORIGIN/../$LIB/elfutils/libebl_x86_64.so\000\242\001\000\000\000\000\300\317\377\377\377\177\000\000\240N\242\001\000\000\000\000\220\317\377\377\377\177\000\000U\236o\357\377\177\000\000\300\317\377\377\377\177\000\000\240N\242\001\000\000\000\000\000\000\000"
(gdb) show environment $ORIGIN
Environment variable "$ORIGIN" not defined.
(gdb) show environment $LIB
Environment variable "$LIB" not defined.
(gdb) n
329		if (h == NULL)
(gdb) p h
$98 = (void *) 0x0
(gdb) show environment LD_LIBRARY_PATH
LD_LIBRARY_PATH = /p/paradyn/development/sasha/local/lib/elfutils/:/p/paradyn/development/sasha/local/lib/:/p/paradyn/packages/libdwarf/lib:.
(gdb) ls /p/paradyn/development/sasha/local/lib/elfutils/
Undefined command: "ls".  Try "help".
(gdb) shell 
[sasha@zatar] (1)$ ls /p/paradyn/development/sasha/local/lib/elfutils/
libebl_aarch64-0.175.so*  libebl_i386-0.175.so*   libebl_ppc64.so@        libebl_sparc-0.175.so*
libebl_aarch64.so@        libebl_i386.so@         libebl_ppc.so@          libebl_sparc.so@
libebl_alpha-0.175.so*    libebl_ia64-0.175.so*   libebl_riscv-0.175.so*  libebl_tilegx-0.175.so*
libebl_alpha.so@          libebl_ia64.so@         libebl_riscv.so@        libebl_tilegx.so@
libebl_arm-0.175.so*      libebl_m68k-0.175.so*   libebl_s390-0.175.so*   libebl_x86_64-0.175.so*
libebl_arm.so@            libebl_m68k.so@         libebl_s390.so@         libebl_x86_64.so@
libebl_bpf-0.175.so*      libebl_ppc-0.175.so*    libebl_sh-0.175.so*
libebl_bpf.so@            libebl_ppc64-0.175.so*  libebl_sh.so@
[sasha@zatar] (2)$ exit
exit
(gdb) frame
#0  openbackend (elf=0x1a24ea0, emulation=0x0, machine=62)
    at /p/paradyn/development/sasha/dyninst/build.dir/elfutils/src/LibElf/libebl/eblopenbackend.c:329
329		if (h == NULL)
(gdb) 




From: Sasha Da Rocha Pinheiro
Sent: Tuesday, February 12, 2019 11:57 AM
To: Mark Wielaard
Cc: elfutils-devel@sourceware.org; Ben Woodard
Subject: Re: unknown error after dwarf_cfi_addrframe()
 
Not working even after adding the directory to libebl_*.so to LD_LIBRARY_PATH.
default_abi_cfi is still called returning -1.

Sasha



From: Mark Wielaard <mark@klomp.org>
Sent: Tuesday, February 12, 2019 2:09 AM
To: Sasha Da Rocha Pinheiro
Cc: elfutils-devel@sourceware.org; Ben Woodard
Subject: Re: unknown error after dwarf_cfi_addrframe()
 
On Tue, Feb 12, 2019 at 07:25:28AM +0000, Sasha Da Rocha Pinheiro wrote:
> Oh this is a whole new thing. How have this worked before without those .so? After downloading and compiling elfutils we only copy libdw and libelf.

The backends are only used for architecture specific ELF things.
Most of DWARF can be understood in an architecture independent way.
But CFI does have some arch specific things.

You should really use make install to get a proper installation,
not just copy some files. Otherwise you might indeed miss the
backends, or translations, etc.

Cheers,

Mark