From: Andrei Vagin <avagin@gmail.com>
To: Will Deacon <will@kernel.org>, Catalin Marinas <catalin.marinas@arm.com>
Cc: Oleg Nesterov <oleg@redhat.com>,
linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org, Andrei Vagin <avagin@gmail.com>,
Dave Martin <Dave.Martin@arm.com>,
Keno Fischer <keno@juliacomputing.com>
Subject: [PATCH 1/4] arm64: expose orig_x0 in the user_pt_regs structure
Date: Mon, 22 Mar 2021 15:50:50 -0700 [thread overview]
Message-ID: <20210322225053.428615-2-avagin@gmail.com> (raw)
In-Reply-To: <20210322225053.428615-1-avagin@gmail.com>
orig_x0 is recorded at the start of the syscall entry and then it is
used for resetting the argument back to its original value during
syscall restarts.
If orig_x0 isn't available from user-space, this makes it tricky to
manage arguments of restarted system calls.
Cc: Keno Fischer <keno@juliacomputing.com>
Signed-off-by: Andrei Vagin <avagin@gmail.com>
---
arch/arm64/include/asm/ptrace.h | 2 +-
arch/arm64/include/uapi/asm/ptrace.h | 1 +
2 files changed, 2 insertions(+), 1 deletion(-)
diff --git a/arch/arm64/include/asm/ptrace.h b/arch/arm64/include/asm/ptrace.h
index e58bca832dff..d4cdf98ac003 100644
--- a/arch/arm64/include/asm/ptrace.h
+++ b/arch/arm64/include/asm/ptrace.h
@@ -183,9 +183,9 @@ struct pt_regs {
u64 sp;
u64 pc;
u64 pstate;
+ u64 orig_x0;
};
};
- u64 orig_x0;
#ifdef __AARCH64EB__
u32 unused2;
s32 syscallno;
diff --git a/arch/arm64/include/uapi/asm/ptrace.h b/arch/arm64/include/uapi/asm/ptrace.h
index 758ae984ff97..3c118c5b0893 100644
--- a/arch/arm64/include/uapi/asm/ptrace.h
+++ b/arch/arm64/include/uapi/asm/ptrace.h
@@ -90,6 +90,7 @@ struct user_pt_regs {
__u64 sp;
__u64 pc;
__u64 pstate;
+ __u64 orig_x0;
};
struct user_fpsimd_state {
--
2.29.2
_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next prev parent reply other threads:[~2021-03-22 22:55 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-03-22 22:50 [PATCH 0/4 v3] arm64/ptrace: allow to get all registers on syscall traps Andrei Vagin
2021-03-22 22:50 ` Andrei Vagin [this message]
2021-03-26 18:28 ` [PATCH 1/4] arm64: expose orig_x0 in the user_pt_regs structure Catalin Marinas
2021-03-27 0:35 ` Andrei Vagin
2021-03-27 13:01 ` Catalin Marinas
2021-03-22 22:50 ` [PATCH 2/4] arm64/ptrace: introduce orig_x7 " Andrei Vagin
2021-03-26 18:39 ` Catalin Marinas
2021-03-22 22:50 ` [PATCH 3/4] selftest/arm64/ptrace: add a test for orig_x0 Andrei Vagin
2021-03-22 22:50 ` [PATCH 4/4] selftest/arm64/ptrace: add a test for orig_x7 Andrei Vagin
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20210322225053.428615-2-avagin@gmail.com \
--to=avagin@gmail.com \
--cc=Dave.Martin@arm.com \
--cc=catalin.marinas@arm.com \
--cc=keno@juliacomputing.com \
--cc=linux-arm-kernel@lists.infradead.org \
--cc=linux-kernel@vger.kernel.org \
--cc=oleg@redhat.com \
--cc=will@kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).