From nobody Sat Feb 7 03:38:35 2026 Received: from mail-lf1-f49.google.com (mail-lf1-f49.google.com [209.85.167.49]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 7AD5A20E034 for ; Tue, 29 Oct 2024 10:53:35 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.167.49 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1730199217; cv=none; b=sa0vdOPd19Rh9/qi7g+odOOcMi8t1/d9a+Jmn5z8J0J1aU3UKHyxS7DGlCyVIRybAg3GbP7IpE2VYS9j81ZVQnzNpftI5X/kSojO7vEIO32yfa2z/ZASb4v6NrfI2MQAh0MOIm9VTN7fIXzZk5Wy7eIHcbn8ojm8BfOYWuU6pe0= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1730199217; c=relaxed/simple; bh=1+xGn+I5zGJWUmASKFRl6SMQB/wIv78GqsCAwMsFqAA=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=Xh0zY+GoBlRTNu+I02qupVuFxZoX5igNqOl+e3uWY4b79hUDuNVI8b2N1PZ449wa89PLbtLfaFfEXgy20PIqByiSwKLpf+kwaIgarG3uHpMAZBoIYtlaDtthrstEpWUjDfpVE0ZjXQdZH9yJxp2Z6bqcQZj6AscOtxBlk1HTU5Q= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linaro.org; spf=pass smtp.mailfrom=linaro.org; dkim=pass (2048-bit key) header.d=linaro.org header.i=@linaro.org header.b=rDzmJj8q; arc=none smtp.client-ip=209.85.167.49 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linaro.org Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linaro.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=linaro.org header.i=@linaro.org header.b="rDzmJj8q" Received: by mail-lf1-f49.google.com with SMTP id 2adb3069b0e04-539f0f9ee49so5633413e87.1 for ; Tue, 29 Oct 2024 03:53:35 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; t=1730199214; x=1730804014; darn=vger.kernel.org; h=cc:to:in-reply-to:references:message-id:content-transfer-encoding :mime-version:subject:date:from:from:to:cc:subject:date:message-id :reply-to; bh=e/3IXPLtEzkdPxakYsKtSl6x7P98QonT1kDDJ6tUink=; b=rDzmJj8qs6GBlIeQ4AEb/W5rR3G6Usf1zycSEqnNmDafPcXaPXtCrO9dI6OBzAnw9E kXdgQNuKwZxos+uA+qVG2uLfoKhZF19CUif/Uv5WshpSelS5bXnvg3yC3Cn43HXC0DSM gKWsivB2ggeGKhhvEBnOGCpuVaBFafT0eerAmjjr05PyxXBIOS1L1ntAdOK6UDpbRooX KDEFieZRWbU7SavjQkhaKA5BG1vfWwY2JJHMl3uV1mfBWM3MSlUK4jwMGr+c5UK5mRqI qT0T2X3xn6Gy9uCiQTTNRXY6UL1veVvw7ZAgm23j1vS05m+vlcHas3xwrLCOdAxJ/+4c G4gg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1730199214; x=1730804014; h=cc:to:in-reply-to:references:message-id:content-transfer-encoding :mime-version:subject:date:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=e/3IXPLtEzkdPxakYsKtSl6x7P98QonT1kDDJ6tUink=; b=sKXwQ0f+tq3vojb2hIZvuuPNI2XKjQJslyy4qd924/7XtlU66wfem5aweUDmtRp0dE nuQjn6oSM6kjrzRdfWUFN5nm+3P54/SbBbxiMfvHUWSb4mEgAFvX47KUvsC9eRKG/WRq hzG+5rT/RBDxWUdNToCC4bq1+NMwPhHULhcdyYKtgWlSNIVHKKj1gSaSb1OsDbMypvSz 1ilMT4Wjy29Z7bMDylfV+QkmP6PJRm4mkEn1sTloUgrsKTOQLON1osQp613X2g1zphaV sz5SZ4QYI39aKGzJLK6ArDTg+3ZzD7tdh50Akd5QybOt+20xxSmlr72plQ2i8u7jpLL1 OaOg== X-Forwarded-Encrypted: i=1; AJvYcCW/+CUS6qU5cWvre1/2KEc86wvaDn6250tHYIY2W8d3QQkHWrQq3hPKU5lDZ0M//AA9x3B6jrCiNrRN0Mk=@vger.kernel.org X-Gm-Message-State: AOJu0Yy9oB9fkERgfDlfAplajYMlKY+vmOdL1smpnqFdZS873oSL5eOx P9ypKH85Gvaf82/NSGJGd+8GcM6za3tlkgtdEtpz8w4v95vFNbfBNyE2HW0GxWkbw9AZZmZi+Y4 K X-Google-Smtp-Source: AGHT+IEv5OXz88Rah8wOjpkuPKbULq5MyD1fSlWtEkl9G05R3LmA9cdfp5t7ybciPjtapRrrDr8Jpw== X-Received: by 2002:a05:6512:3084:b0:539:fed8:321 with SMTP id 2adb3069b0e04-53b34a31cdbmr4939966e87.51.1730199213675; Tue, 29 Oct 2024 03:53:33 -0700 (PDT) Received: from lino.lan ([85.235.12.238]) by smtp.gmail.com with ESMTPSA id 2adb3069b0e04-53b2e12452fsm1351307e87.73.2024.10.29.03.53.29 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 29 Oct 2024 03:53:32 -0700 (PDT) From: Linus Walleij Date: Tue, 29 Oct 2024 11:53:05 +0100 Subject: [PATCH RFC v2 25/28] ARM: entry: Create irqentry calls from kernel mode Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20241029-arm-generic-entry-v2-25-573519abef38@linaro.org> References: <20241029-arm-generic-entry-v2-0-573519abef38@linaro.org> In-Reply-To: <20241029-arm-generic-entry-v2-0-573519abef38@linaro.org> To: Oleg Nesterov , Russell King , Kees Cook , Andy Lutomirski , Will Drewry , Frederic Weisbecker , "Paul E. McKenney" , Jinjie Ruan , Arnd Bergmann , Ard Biesheuvel , Al Viro Cc: linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Linus Walleij X-Mailer: b4 0.14.0 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 --- 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, l= ong); 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); =20 #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 =20 + 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 =20 #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) +{ +} --=20 2.46.2