Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753727AbbF2Tg3 (ORCPT ); Mon, 29 Jun 2015 15:36:29 -0400 Received: from mail.kernel.org ([198.145.29.136]:41656 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753317AbbF2TeT (ORCPT ); Mon, 29 Jun 2015 15:34:19 -0400 From: Andy Lutomirski To: x86@kernel.org, linux-kernel@vger.kernel.org Cc: =?UTF-8?q?Fr=C3=A9d=C3=A9ric=20Weisbecker?= , Rik van Riel , Oleg Nesterov , Denys Vlasenko , Borislav Petkov , Kees Cook , Brian Gerst , paulmck@linux.vnet.ibm.com, Andy Lutomirski Subject: [PATCH v4 14/17] x86/asm/entry/64: Migrate error and interrupt exit work to C Date: Mon, 29 Jun 2015 12:33:46 -0700 Message-Id: <1a5858d079609a3e293123c9ee45de433a4e9c44.1435602481.git.luto@kernel.org> X-Mailer: git-send-email 2.4.3 In-Reply-To: References: In-Reply-To: References: Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3100 Lines: 129 Signed-off-by: Andy Lutomirski --- arch/x86/entry/entry_64.S | 63 +++++++++++----------------------------- arch/x86/entry/entry_64_compat.S | 5 ++++ 2 files changed, 22 insertions(+), 46 deletions(-) diff --git a/arch/x86/entry/entry_64.S b/arch/x86/entry/entry_64.S index ce2c9049abef..08a37ec049f0 100644 --- a/arch/x86/entry/entry_64.S +++ b/arch/x86/entry/entry_64.S @@ -508,7 +508,16 @@ END(irq_entries_start) testb $3, CS(%rsp) jz 1f + + /* + * IRQ from user mode. Switch to kernel gsbase and inform context + * tracking that we're in kernel mode. + */ SWAPGS +#ifdef CONFIG_CONTEXT_TRACKING + call enter_from_user_mode +#endif + 1: /* * Save previous stack pointer, optionally switch to interrupt stack. @@ -547,26 +556,13 @@ ret_from_intr: testb $3, CS(%rsp) jz retint_kernel - /* Interrupt came from user space */ -GLOBAL(retint_user) - GET_THREAD_INFO(%rcx) - /* %rcx: thread info. Interrupts are off. */ -retint_with_reschedule: - movl $_TIF_WORK_MASK, %edi -retint_check: + /* Interrupt came from user space */ LOCKDEP_SYS_EXIT_IRQ - movl TI_flags(%rcx), %edx - andl %edi, %edx - jnz retint_careful - -retint_swapgs: /* return to user-space */ - /* - * The iretq could re-enable interrupts: - */ - DISABLE_INTERRUPTS(CLBR_ANY) +GLOBAL(retint_user) + mov %rsp,%rdi + call prepare_exit_to_usermode TRACE_IRQS_IRETQ - SWAPGS jmp restore_regs_and_iret @@ -644,35 +640,6 @@ native_irq_return_ldt: popq %rax jmp native_irq_return_iret #endif - - /* edi: workmask, edx: work */ -retint_careful: - bt $TIF_NEED_RESCHED, %edx - jnc retint_signal - TRACE_IRQS_ON - ENABLE_INTERRUPTS(CLBR_NONE) - pushq %rdi - SCHEDULE_USER - popq %rdi - GET_THREAD_INFO(%rcx) - DISABLE_INTERRUPTS(CLBR_NONE) - TRACE_IRQS_OFF - jmp retint_check - -retint_signal: - testl $_TIF_DO_NOTIFY_MASK, %edx - jz retint_swapgs - TRACE_IRQS_ON - ENABLE_INTERRUPTS(CLBR_NONE) - movq $-1, ORIG_RAX(%rsp) - xorl %esi, %esi /* oldset */ - movq %rsp, %rdi /* &pt_regs */ - call do_notify_resume - DISABLE_INTERRUPTS(CLBR_NONE) - TRACE_IRQS_OFF - GET_THREAD_INFO(%rcx) - jmp retint_with_reschedule - END(common_interrupt) /* @@ -1088,6 +1055,10 @@ error_entry_from_usermode_swapgs: SWAPGS error_entry_from_usermode_after_swapgs: +#ifdef CONFIG_CONTEXT_TRACKING + call enter_from_user_mode +#endif + error_entry_done: TRACE_IRQS_OFF ret diff --git a/arch/x86/entry/entry_64_compat.S b/arch/x86/entry/entry_64_compat.S index ac0658142ae1..566d33f17d0b 100644 --- a/arch/x86/entry/entry_64_compat.S +++ b/arch/x86/entry/entry_64_compat.S @@ -454,6 +454,11 @@ ia32_badarg: DISABLE_INTERRUPTS(CLBR_NONE) TRACE_IRQS_OFF + /* Now finish entering normal kernel mode. */ +#ifdef CONFIG_CONTEXT_TRACKING + call enter_from_user_mode +#endif + /* And exit again. */ jmp retint_user -- 2.4.3 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/