From: Max Filippov <jcmvbkbc@gmail.com>
To: linux-xtensa@linux-xtensa.org
Cc: Chris Zankel <chris@zankel.net>,
linux-kernel@vger.kernel.org, bpf@vger.kernel.org,
netdev@vger.kernel.org, linux-kselftest@vger.kernel.org,
Max Filippov <jcmvbkbc@gmail.com>
Subject: [PATCH 1/3] xtensa: expose syscall through user_pt_regs
Date: Sat, 18 Jul 2020 19:16:52 -0700 [thread overview]
Message-ID: <20200719021654.25922-2-jcmvbkbc@gmail.com> (raw)
In-Reply-To: <20200719021654.25922-1-jcmvbkbc@gmail.com>
Use one of the reserved slots in struct user_pt_regs to return syscall
number in the GPR regset. Update syscall number from the GPR regset only
when it's non-zero.
Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
---
arch/xtensa/include/uapi/asm/ptrace.h | 3 ++-
arch/xtensa/kernel/ptrace.c | 4 ++++
2 files changed, 6 insertions(+), 1 deletion(-)
diff --git a/arch/xtensa/include/uapi/asm/ptrace.h b/arch/xtensa/include/uapi/asm/ptrace.h
index 2ec0f9100a06..50db3e0a6341 100644
--- a/arch/xtensa/include/uapi/asm/ptrace.h
+++ b/arch/xtensa/include/uapi/asm/ptrace.h
@@ -50,7 +50,8 @@ struct user_pt_regs {
__u32 windowstart;
__u32 windowbase;
__u32 threadptr;
- __u32 reserved[7 + 48];
+ __u32 syscall;
+ __u32 reserved[6 + 48];
__u32 a[64];
};
diff --git a/arch/xtensa/kernel/ptrace.c b/arch/xtensa/kernel/ptrace.c
index 0278d7dfb4d6..437b4297948d 100644
--- a/arch/xtensa/kernel/ptrace.c
+++ b/arch/xtensa/kernel/ptrace.c
@@ -52,6 +52,7 @@ static int gpr_get(struct task_struct *target,
.threadptr = regs->threadptr,
.windowbase = regs->windowbase,
.windowstart = regs->windowstart,
+ .syscall = regs->syscall,
};
memcpy(newregs.a,
@@ -91,6 +92,9 @@ static int gpr_set(struct task_struct *target,
regs->sar = newregs.sar;
regs->threadptr = newregs.threadptr;
+ if (newregs.syscall)
+ regs->syscall = newregs.syscall;
+
if (newregs.windowbase != regs->windowbase ||
newregs.windowstart != regs->windowstart) {
u32 rotws, wmask;
--
2.20.1
next prev parent reply other threads:[~2020-07-19 2:17 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-07-19 2:16 [PATCH 0/3] xtensa: add seccomp support Max Filippov
2020-07-19 2:16 ` Max Filippov [this message]
2020-07-19 2:16 ` [PATCH 2/3] " Max Filippov
2020-07-19 2:16 ` [PATCH 3/3] selftests/seccomp: add xtensa support Max Filippov
2020-09-11 19:38 ` [PATCH 0/3] xtensa: add seccomp support Kees Cook
2020-09-11 19:58 ` Max Filippov
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