From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-ed1-f71.google.com (mail-ed1-f71.google.com [209.85.208.71]) by kanga.kvack.org (Postfix) with ESMTP id 4499B6B026D for ; Wed, 18 Jul 2018 05:41:24 -0400 (EDT) Received: by mail-ed1-f71.google.com with SMTP id d5-v6so1699570edq.3 for ; Wed, 18 Jul 2018 02:41:24 -0700 (PDT) Received: from theia.8bytes.org (8bytes.org. [2a01:238:4383:600:38bc:a715:4b6d:a889]) by mx.google.com with ESMTPS id z25-v6si2943977edq.292.2018.07.18.02.41.23 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Wed, 18 Jul 2018 02:41:23 -0700 (PDT) From: Joerg Roedel Subject: [PATCH 02/39] x86/entry/32: Rename TSS_sysenter_sp0 to TSS_entry2task_stack Date: Wed, 18 Jul 2018 11:40:39 +0200 Message-Id: <1531906876-13451-3-git-send-email-joro@8bytes.org> In-Reply-To: <1531906876-13451-1-git-send-email-joro@8bytes.org> References: <1531906876-13451-1-git-send-email-joro@8bytes.org> Sender: owner-linux-mm@kvack.org List-ID: To: Thomas Gleixner , Ingo Molnar , "H . Peter Anvin" Cc: x86@kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, Linus Torvalds , Andy Lutomirski , Dave Hansen , Josh Poimboeuf , Juergen Gross , Peter Zijlstra , Borislav Petkov , Jiri Kosina , Boris Ostrovsky , Brian Gerst , David Laight , Denys Vlasenko , Eduardo Valentin , Greg KH , Will Deacon , aliguori@amazon.com, daniel.gruss@iaik.tugraz.at, hughd@google.com, keescook@google.com, Andrea Arcangeli , Waiman Long , Pavel Machek , "David H . Gutteridge" , jroedel@suse.de, joro@8bytes.org From: Joerg Roedel The stack address doesn't need to be stored in tss.sp0 if we switch manually like on sysenter. Rename the offset so that it still makes sense when we change its location. We will also use this stack for all kernel-entry points, not just sysenter. Reflect that and the fact that it is the offset to the task-stack location in the name as well. Signed-off-by: Joerg Roedel --- arch/x86/entry/entry_32.S | 2 +- arch/x86/kernel/asm-offsets_32.c | 5 +++-- 2 files changed, 4 insertions(+), 3 deletions(-) diff --git a/arch/x86/entry/entry_32.S b/arch/x86/entry/entry_32.S index c371bfe..39f711a 100644 --- a/arch/x86/entry/entry_32.S +++ b/arch/x86/entry/entry_32.S @@ -412,7 +412,7 @@ ENTRY(xen_sysenter_target) * 0(%ebp) arg6 */ ENTRY(entry_SYSENTER_32) - movl TSS_sysenter_sp0(%esp), %esp + movl TSS_entry2task_stack(%esp), %esp .Lsysenter_past_esp: pushl $__USER_DS /* pt_regs->ss */ pushl %ebp /* pt_regs->sp (stashed in bp) */ diff --git a/arch/x86/kernel/asm-offsets_32.c b/arch/x86/kernel/asm-offsets_32.c index a4a3be3..15b3f45 100644 --- a/arch/x86/kernel/asm-offsets_32.c +++ b/arch/x86/kernel/asm-offsets_32.c @@ -46,8 +46,9 @@ void foo(void) OFFSET(saved_context_gdt_desc, saved_context, gdt_desc); BLANK(); - /* Offset from the sysenter stack to tss.sp0 */ - DEFINE(TSS_sysenter_sp0, offsetof(struct cpu_entry_area, tss.x86_tss.sp0) - + /* Offset from the entry stack to task stack stored in TSS */ + DEFINE(TSS_entry2task_stack, + offsetof(struct cpu_entry_area, tss.x86_tss.sp0) - offsetofend(struct cpu_entry_area, entry_stack_page.stack)); #ifdef CONFIG_STACKPROTECTOR -- 2.7.4