From: houdek.ryan@fex-emu.org
To: unlisted-recipients:; (no To-header on input)
Cc: linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org,
Ryan Houdek <Houdek.Ryan@fex-emu.org>
Subject: [PATCH 1/4] Move userspace syscall dispatch outside of common entry
Date: Sat, 29 May 2021 01:16:17 -0700 [thread overview]
Message-ID: <20210529081620.164422-2-Houdek.Ryan@fex-emu.org> (raw)
In-Reply-To: <20210529081620.164422-1-Houdek.Ryan@fex-emu.org>
From: Ryan Houdek <Houdek.Ryan@fex-emu.org>
This will allow other architectures to support userspace syscall
dispatch without supporting the syscall common entry.
Signed-off-by: Ryan Houdek <Houdek.Ryan@fex-emu.org>
---
arch/Kconfig | 4 ++++
include/linux/syscall_user_dispatch.h | 4 +++-
kernel/entry/Makefile | 3 ++-
kernel/entry/common.c | 3 +--
kernel/entry/common.h | 7 -------
kernel/entry/syscall_user_dispatch.c | 2 --
6 files changed, 10 insertions(+), 13 deletions(-)
delete mode 100644 kernel/entry/common.h
diff --git a/arch/Kconfig b/arch/Kconfig
index c45b770d3579..def67ebbae83 100644
--- a/arch/Kconfig
+++ b/arch/Kconfig
@@ -30,7 +30,11 @@ config SET_FS
config HOTPLUG_SMT
bool
+config SYSCALL_USER_DISPATCH
+ bool
+
config GENERIC_ENTRY
+ select SYSCALL_USER_DISPATCH
bool
config KPROBES
diff --git a/include/linux/syscall_user_dispatch.h b/include/linux/syscall_user_dispatch.h
index a0ae443fb7df..9d1e244d7021 100644
--- a/include/linux/syscall_user_dispatch.h
+++ b/include/linux/syscall_user_dispatch.h
@@ -7,7 +7,7 @@
#include <linux/thread_info.h>
-#ifdef CONFIG_GENERIC_ENTRY
+#ifdef CONFIG_SYSCALL_USER_DISPATCH
struct syscall_user_dispatch {
char __user *selector;
@@ -16,6 +16,8 @@ struct syscall_user_dispatch {
bool on_dispatch;
};
+bool syscall_user_dispatch(struct pt_regs *regs);
+
int set_syscall_user_dispatch(unsigned long mode, unsigned long offset,
unsigned long len, char __user *selector);
diff --git a/kernel/entry/Makefile b/kernel/entry/Makefile
index 095c775e001e..35684390d56e 100644
--- a/kernel/entry/Makefile
+++ b/kernel/entry/Makefile
@@ -9,5 +9,6 @@ KCOV_INSTRUMENT := n
CFLAGS_REMOVE_common.o = -fstack-protector -fstack-protector-strong
CFLAGS_common.o += -fno-stack-protector
-obj-$(CONFIG_GENERIC_ENTRY) += common.o syscall_user_dispatch.o
+obj-$(CONFIG_GENERIC_ENTRY) += common.o
+obj-$(CONFIG_SYSCALL_USER_DISPATCH) += syscall_user_dispatch.o
obj-$(CONFIG_KVM_XFER_TO_GUEST_WORK) += kvm.o
diff --git a/kernel/entry/common.c b/kernel/entry/common.c
index a0b3b04fb596..84ea1e66e0b2 100644
--- a/kernel/entry/common.c
+++ b/kernel/entry/common.c
@@ -5,8 +5,7 @@
#include <linux/highmem.h>
#include <linux/livepatch.h>
#include <linux/audit.h>
-
-#include "common.h"
+#include <linux/syscall_user_dispatch.h>
#define CREATE_TRACE_POINTS
#include <trace/events/syscalls.h>
diff --git a/kernel/entry/common.h b/kernel/entry/common.h
deleted file mode 100644
index f6e6d02f07fe..000000000000
--- a/kernel/entry/common.h
+++ /dev/null
@@ -1,7 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0 */
-#ifndef _COMMON_H
-#define _COMMON_H
-
-bool syscall_user_dispatch(struct pt_regs *regs);
-
-#endif
diff --git a/kernel/entry/syscall_user_dispatch.c b/kernel/entry/syscall_user_dispatch.c
index c240302f56e2..352da8427b01 100644
--- a/kernel/entry/syscall_user_dispatch.c
+++ b/kernel/entry/syscall_user_dispatch.c
@@ -14,8 +14,6 @@
#include <asm/syscall.h>
-#include "common.h"
-
static void trigger_sigsys(struct pt_regs *regs)
{
struct kernel_siginfo info;
--
2.30.2
next prev parent reply other threads:[~2021-05-29 8:17 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-05-29 8:16 [PATCH 0/4] arm64: Implement userspace syscall dispatch houdek.ryan
2021-05-29 8:16 ` houdek.ryan [this message]
2021-06-02 15:41 ` [PATCH 1/4] Move userspace syscall dispatch outside of common entry Thomas Gleixner
2021-06-03 10:58 ` Ryan Houdek
2021-05-29 8:16 ` [PATCH 2/4] arm64: Track the sigreturn landing pad location houdek.ryan
2021-05-29 8:16 ` [PATCH 3/4] arm64: Enable userspace syscall dispatch houdek.ryan
2021-05-29 8:16 ` [PATCH 4/4] arm64: tools: Update syscall user dispatch tests houdek.ryan
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