From: John Baldwin <jhb@FreeBSD.org>
To: Luis Machado <luis.machado@arm.com>, gdb-patches@sourceware.org
Cc: thiago.bauermann@linaro.org
Subject: Re: [PATCH] [AArch64] Enable pointer authentication support for aarch64 bare metal/kernel mode addresses
Date: Wed, 18 Jan 2023 10:39:49 -0800 [thread overview]
Message-ID: <a83eaa2d-9494-9907-37f4-be7400af7a5b@FreeBSD.org> (raw)
In-Reply-To: <19302961-c418-a266-567c-d52b87f112f8@arm.com>
On 1/5/23 5:16 AM, Luis Machado wrote:
> Hi John,
>
> Any thoughts on this patch from BSD's side?
Sorry, I missed the cc earlier. FreeBSD does have support for the userland
registers that I haven't yet added for userland PAC and this seems to make
that easier as I will just need to add the registers to the tdesc when
present/supported. However, one question I have is what does this do if the
registers aren't available and kernel addresses are used? I have this use
case for existing FreeBSD/aarch64 kernel debugging. The default version of
the gdbarch hook seems to always assume TBI and strip the upper bits, but
for kernel addresses what I kind of need is to sign-extend addresses based
on bit 55. I do have a separate gdbarch for kernels vs userland programs
so it might just be I need a custom version of this gdbarch hook for the kernel
gdbarch?
--
John Baldwin
next prev parent reply other threads:[~2023-01-18 18:39 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-12-16 10:57 Luis Machado
2022-12-20 3:20 ` Thiago Jung Bauermann
2022-12-20 9:17 ` Luis Machado
2023-01-05 13:16 ` Luis Machado
2023-01-18 18:39 ` John Baldwin [this message]
2023-01-19 9:34 ` Luis Machado
2023-01-19 18:35 ` John Baldwin
2023-02-21 9:11 ` Luis Machado
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