From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932221AbeBGUUl (ORCPT ); Wed, 7 Feb 2018 15:20:41 -0500 Received: from isilmar-4.linta.de ([136.243.71.142]:59540 "EHLO isilmar-4.linta.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754572AbeBGUTo (ORCPT ); Wed, 7 Feb 2018 15:19:44 -0500 From: Dominik Brodowski To: linux-kernel@vger.kernel.org, mingo@kernel.org, x86@kernel.org Cc: dan.j.williams@intel.com, tglx@linutronix.de, ak@linux.intel.com, torvalds@linux-foundation.org, luto@kernel.org Subject: [RFC v2 PATCH 2/7] x86/entry: merge POP_C_REGS and POP_EXTRA_REGS Date: Wed, 7 Feb 2018 21:15:12 +0100 Message-Id: <20180207201517.6518-3-linux@dominikbrodowski.net> X-Mailer: git-send-email 2.16.1 In-Reply-To: <20180207201517.6518-1-linux@dominikbrodowski.net> References: <20180207201517.6518-1-linux@dominikbrodowski.net> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org The two special, opencoded cases for POP_C_REGS can be handled by ASM macros. Signed-off-by: Dominik Brodowski --- arch/x86/entry/calling.h | 15 +++++++++++---- arch/x86/entry/entry_64.S | 26 ++++---------------------- 2 files changed, 15 insertions(+), 26 deletions(-) diff --git a/arch/x86/entry/calling.h b/arch/x86/entry/calling.h index 8907a6593b42..3bda31736a7b 100644 --- a/arch/x86/entry/calling.h +++ b/arch/x86/entry/calling.h @@ -139,25 +139,32 @@ For 32-bit we have the following conventions - kernel is built with xorq %r15, %r15 .endm - .macro POP_EXTRA_REGS + .macro POP_REGS pop_rdi=1 skip_r11rcx=0 popq %r15 popq %r14 popq %r13 popq %r12 popq %rbp popq %rbx - .endm - - .macro POP_C_REGS + .if \skip_r11rcx + popq %rsi + .else popq %r11 + .endif popq %r10 popq %r9 popq %r8 popq %rax + .if \skip_r11rcx + popq %rsi + .else popq %rcx + .endif popq %rdx popq %rsi + .if \pop_rdi popq %rdi + .endif .endm .macro icebp diff --git a/arch/x86/entry/entry_64.S b/arch/x86/entry/entry_64.S index 91e8d84c2496..286b24b650da 100644 --- a/arch/x86/entry/entry_64.S +++ b/arch/x86/entry/entry_64.S @@ -334,15 +334,7 @@ GLOBAL(entry_SYSCALL_64_after_hwframe) syscall_return_via_sysret: /* rcx and r11 are already restored (see code above) */ UNWIND_HINT_EMPTY - POP_EXTRA_REGS - popq %rsi /* skip r11 */ - popq %r10 - popq %r9 - popq %r8 - popq %rax - popq %rsi /* skip rcx */ - popq %rdx - popq %rsi + POP_REGS pop_rdi=0 skip_r11rcx=1 /* * Now all regs are restored except RSP and RDI. @@ -635,15 +627,7 @@ GLOBAL(swapgs_restore_regs_and_return_to_usermode) ud2 1: #endif - POP_EXTRA_REGS - popq %r11 - popq %r10 - popq %r9 - popq %r8 - popq %rax - popq %rcx - popq %rdx - popq %rsi + POP_REGS pop_rdi=0 /* * The stack is now user RDI, orig_ax, RIP, CS, EFLAGS, RSP, SS. @@ -701,8 +685,7 @@ GLOBAL(restore_regs_and_return_to_kernel) ud2 1: #endif - POP_EXTRA_REGS - POP_C_REGS + POP_REGS addq $8, %rsp /* skip regs->orig_ax */ INTERRUPT_RETURN @@ -1661,8 +1644,7 @@ end_repeat_nmi: nmi_swapgs: SWAPGS_UNSAFE_STACK nmi_restore: - POP_EXTRA_REGS - POP_C_REGS + POP_REGS /* * Skip orig_ax and the "outermost" frame to point RSP at the "iret" -- 2.16.1