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Message-ID: <20240722213915.GS3766212@port70.net>
Date: Mon, 22 Jul 2024 23:39:15 +0200
From: Szabolcs Nagy <nsz@...t70.net>
To: Howard Su <howard0su@...il.com>
Cc: Rich Felker <dalias@...c.org>, Thorsten Glaser <tg@...bsd.de>,
musl@...ts.openwall.com
Subject: Re: [Suggestion] Add cfi directives to assembly code via
chatgpt
* Howard Su <howard0su@...il.com> [2024-07-22 14:39:35 +0800]:
> fair enough. Let's put aside that LLM writing the CFI directives. I do have
> knowledge about it to hand write it.
>
> Do you think it is a good idea to put effort into adding CFI to those
> assembly code, especially the thread_cp part, which blocks my debug.
note that there is now support in gas to synthetize the CFI for
manually written x86 asm code with --scfi=experimental
https://sourceware.org/binutils/docs/as.html
the aarch64 support just got committed recently
https://sourceware.org/git/?p=binutils-gdb.git;a=commit;h=29085f7243e415db0e1617173eb80c441671ba0e
there is no support for arm yet.
meanwhile musl has tools/add-cfi*.awk that you could extend to
support arm, this is simpler than adding the gas support as it
only has to work for musl code.
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