linux-kernel - [PATCH RFC v2 25/28] ARM: entry: Create irqentry calls from kernel mode

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Message-Id: <20241029-arm-generic-entry-v2-25-573519abef38@linaro.org>
Date: Tue, 29 Oct 2024 11:53:05 +0100
From: Linus Walleij <linus.walleij@...aro.org>
To: Oleg Nesterov <oleg@...hat.com>, Russell King <linux@...linux.org.uk>, 
 Kees Cook <kees@...nel.org>, Andy Lutomirski <luto@...capital.net>, 
 Will Drewry <wad@...omium.org>, Frederic Weisbecker <frederic@...nel.org>, 
 "Paul E. McKenney" <paulmck@...nel.org>, 
 Jinjie Ruan <ruanjinjie@...wei.com>, Arnd Bergmann <arnd@...db.de>, 
 Ard Biesheuvel <ardb@...nel.org>, Al Viro <viro@...iv.linux.org.uk>
Cc: linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org, 
 Linus Walleij <linus.walleij@...aro.org>
Subject: [PATCH RFC v2 25/28] ARM: entry: Create irqentry calls from kernel
 mode

This adds a few calls to C when exceptions enter/exit from
the kernel itself, so these can be used for generic entry.

Signed-off-by: Linus Walleij <linus.walleij@...aro.org>
---
 arch/arm/include/asm/entry.h   | 2 ++
 arch/arm/kernel/entry-armv.S   | 3 +++
 arch/arm/kernel/entry-header.S | 5 +++++
 arch/arm/kernel/entry.c        | 8 ++++++++
 4 files changed, 18 insertions(+)

diff --git a/arch/arm/include/asm/entry.h b/arch/arm/include/asm/entry.h
index 8b8cc9a1eefb..a78bc5054b09 100644
--- a/arch/arm/include/asm/entry.h
+++ b/arch/arm/include/asm/entry.h
@@ -12,5 +12,7 @@ long syscall_enter_from_user_mode(struct pt_regs *regs, long);
 void syscall_exit_to_user_mode(struct pt_regs *regs);
 void irqentry_enter_from_user_mode(struct pt_regs *regs);
 void irqentry_exit_to_user_mode(struct pt_regs *regs);
+void irqentry_enter_from_kernel_mode(struct pt_regs *regs);
+void irqentry_exit_to_kernel_mode(struct pt_regs *regs);
 
 #endif /* __ASM_ENTRY_H__ */
diff --git a/arch/arm/kernel/entry-armv.S b/arch/arm/kernel/entry-armv.S
index bd468d58dc02..21b11fe199cb 100644
--- a/arch/arm/kernel/entry-armv.S
+++ b/arch/arm/kernel/entry-armv.S
@@ -204,6 +204,9 @@ ENDPROC(__und_invalid)
 	get_thread_info tsk
 	uaccess_entry tsk, r0, r1, r2, \uaccess
 
+	mov	r0, sp				@ 'regs'
+	bl	irqentry_enter_from_kernel_mode
+
 	.if \trace
 #ifdef CONFIG_TRACE_IRQFLAGS
 	bl	trace_hardirqs_off
diff --git a/arch/arm/kernel/entry-header.S b/arch/arm/kernel/entry-header.S
index 51c7f93c1ded..49a9c5cf6fd5 100644
--- a/arch/arm/kernel/entry-header.S
+++ b/arch/arm/kernel/entry-header.S
@@ -210,6 +210,7 @@
 	.else
 	@ IRQs off again before pulling preserved data off the stack
 	disable_irq_notrace
+
 #ifdef CONFIG_TRACE_IRQFLAGS
 	tst	\rpsr, #PSR_I_BIT
 	bleq	trace_hardirqs_on
@@ -217,6 +218,10 @@
 	blne	trace_hardirqs_off
 #endif
 	.endif
+
+	mov	r0, sp				@ 'regs'
+	bl	irqentry_exit_to_kernel_mode
+
 	uaccess_exit tsk, r0, r1
 
 #ifndef CONFIG_THUMB2_KERNEL
diff --git a/arch/arm/kernel/entry.c b/arch/arm/kernel/entry.c
index d7fdb9df3331..674b5adcec00 100644
--- a/arch/arm/kernel/entry.c
+++ b/arch/arm/kernel/entry.c
@@ -56,3 +56,11 @@ noinstr void irqentry_exit_to_user_mode(struct pt_regs *regs)
 	/* This context tracking call has inverse naming */
 	user_enter_callable();
 }
+
+noinstr void irqentry_enter_from_kernel_mode(struct pt_regs *regs)
+{
+}
+
+noinstr void irqentry_exit_to_kernel_mode(struct pt_regs *regs)
+{
+}

-- 
2.46.2