Date: Wed, 5 Jul 2023 14:57:26 +0200 From: Stephane Rochoy <stephane.rochoy@stormshield.eu> To: <freebsd-hackers@freebsd.org> Subject: Opening ARMv7 vmcores with LLDB Message-ID: <86ilayjz2h.fsf@cthulhu.stephaner.labo.int>
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Hi Hackers,
I struggle with lldb to open vmcores written by a 13.1 arm.armv7
kernel.
I'm using LLDB 16.0.6 (from devel/llvm16) as follow:
$ uname -a
FreeBSD sns-debug-armv7.jail.=E2=80=A6 13.2-STABLE FreeBSD=20
14.0-CURRENT
#14 =E2=80=A6-n258033-20b8fbf116f7: =E2=80=A6/arm64.aarch64/sys/AMP=
ERE arm
$ sysctl hw.machine_arch
hw.machine_arch: armv7
$ file vmcore.last kernel
vmcore.last: FreeBSD kernel minidump for arm, little endian,
version 2
kernel: ELF 32-bit LSB executable, ARM, EABI5 version 1
(FreeBSD), dynamically linked, interpreter /red/herring,
BuildID[sha1]=3Db3d5fba55e096b9675ec3e374f73faa4c5c8df02,
for FreeBSD 13.1, not stripped
$ lldb16 -c vmcore.last kernel
(lldb) target create "kernel" --core "vmcore.last"
Core file '/home/stephaner/t/vmcore.last' (arm) was loaded.
(lldb) bt
error: Command requires a process which is currently stopped.
(lldb)
The previous commands are run from a jail built with=20
freebsd-ci[1]:
OSRELEASE=3D13.2-STABLE-02a7d117b5914dd8c42b8d98fe92faca381148bd
TARGET=3Darm
TARGET_ARCH=3Darmv7
Despite looking at Moritz Systems'[2] blog regarding their (great)
work I'm unable to tell if ARMv7 is supposed to be supported. The
patches seems to be only about arm64, i386 and x86_64. (AFAIK
their work landed somewhere in LLVM 15, that's why I'm using 16.)
Any hint would be greatly appreciated :)
[1] https://github.com/freebsd/freebsd-ci.git
[2] https://www.moritz.systems/tags/lldb/
Regards,
--
St=C3=A9phane Rochoy
O: Stormshield
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