From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752903AbbJFAwU (ORCPT ); Mon, 5 Oct 2015 20:52:20 -0400 Received: from mail.kernel.org ([198.145.29.136]:55139 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752639AbbJFAtG (ORCPT ); Mon, 5 Oct 2015 20:49:06 -0400 From: Andy Lutomirski To: x86@kernel.org, linux-kernel@vger.kernel.org Cc: Brian Gerst , Denys Vlasenko , Linus Torvalds , Borislav Petkov , Andy Lutomirski Subject: [PATCH v2 26/36] x86/entry/32: Switch INT80 to the new C syscall path Date: Mon, 5 Oct 2015 17:48:14 -0700 Message-Id: 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 Signed-off-by: Andy Lutomirski --- arch/x86/entry/entry_32.S | 34 +++++++++++++--------------------- 1 file changed, 13 insertions(+), 21 deletions(-) diff --git a/arch/x86/entry/entry_32.S b/arch/x86/entry/entry_32.S index 36b6beb181f6..02881e528945 100644 --- a/arch/x86/entry/entry_32.S +++ b/arch/x86/entry/entry_32.S @@ -153,13 +153,13 @@ #endif /* CONFIG_X86_32_LAZY_GS */ -.macro SAVE_ALL +.macro SAVE_ALL pt_regs_ax=%eax cld PUSH_GS pushl %fs pushl %es pushl %ds - pushl %eax + pushl \pt_regs_ax pushl %ebp pushl %edi pushl %esi @@ -370,20 +370,17 @@ ENDPROC(entry_SYSENTER_32) # system call handler stub ENTRY(entry_INT80_32) ASM_CLAC - pushl %eax # save orig_eax - SAVE_ALL - GET_THREAD_INFO(%ebp) - # system call tracing in operation / emulation - testl $_TIF_WORK_SYSCALL_ENTRY, TI_flags(%ebp) - jnz syscall_trace_entry - cmpl $(NR_syscalls), %eax - jae syscall_badsys -syscall_call: - call *sys_call_table(, %eax, 4) -syscall_after_call: - movl %eax, PT_EAX(%esp) # store the return value -syscall_exit: - jmp syscall_exit_work + pushl %eax /* pt_regs->orig_ax */ + SAVE_ALL pt_regs_ax=$-ENOSYS /* save rest, load -ENOSYS into ax */ + + /* + * User mode is traced as though IRQs are on, and the interrupt gate + * turned them off. + */ + TRACE_IRQS_OFF + + movl %esp, %eax + call do_int80_syscall_32 restore_all: TRACE_IRQS_IRET @@ -491,11 +488,6 @@ syscall_fault: jmp resume_userspace END(syscall_fault) -syscall_badsys: - movl $-ENOSYS, %eax - jmp syscall_after_call -END(syscall_badsys) - sysenter_badsys: movl $-ENOSYS, %eax jmp sysenter_after_call -- 2.4.3