You should build your sources with
CFLAGS += -g1 -fno-omit-frame-pointer ...
LDFLAGS += -g1 -fno-omit-frame-pointer ... (if you are using LTO)
and then split executables (and libraries) to files with DWARF unwind tables
and files with debug symbols only; for each {executable}:
objcopy --only-keep-debug .../root/{executable}
.../root/usr/lib/debug/{executable}.debug
objcopy --strip-debug .../root/{executable}
objcopy --add-gnu-debuglink=.../root/usr/lib/debug/{executable}.debug
{executable}
where {executable} is a relative root path to a binary file (/usr/bin/exe
for example).
You may not copy /usr/lib/debug to a target rootfs but use it to translate
addresses to symbols on a host.
Check also that you built all linked libraries (including libc) with -g1
and -fno-omit-frame-pointer
to get full traces.
If you are using musl for MIPS, make sure you have a patch adding CFI
directives to assembler sources.
For example
https://github.com/keenetic/musl/commit/ee63340090e3261d04bc7e664f352a7e7dd1c32f
(based on
http://lists.openwrt.org/pipermail/openwrt-devel/2020-June/029807.html).
On Mon, Jun 14, 2021 at 10:29 PM Story, Lenny <lst...@irobot.com> wrote:
> Greetings,
>
> The backtraces on my MIPS target are only going two levels, which happen
> to be declared inside my local file.
>
> Because of its size, the target is stripped of the dwarf .debug_ *
> seconds, and the .symtab. Its just too big to load with symbols included.
> I am only looking to get the frame addresses from the target, and plan on
> performing the symbol resolution off target.
>
> What should I look for in trying to see the trace back to main ?
>
> Thanks !
> -Lenny
>
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