linux-kernel - [tip:x86/asm] x86/asm/entry/32: Shorten __audit_syscall

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Date:	Wed, 10 Jun 2015 00:10:10 -0700
From:	tip-bot for Denys Vlasenko <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, peterz@...radead.org,
	wad@...omium.org, brgerst@...il.com, luto@...capital.net,
	dvlasenk@...hat.com, mingo@...nel.org, rostedt@...dmis.org,
	tglx@...utronix.de, keescook@...omium.org, bp@...en8.de,
	oleg@...hat.com, hpa@...or.com, torvalds@...ux-foundation.org,
	fweisbec@...il.com, akpm@...ux-foundation.org, ast@...mgrid.com
Subject: [tip:x86/asm] x86/asm/entry/32: Shorten __audit_syscall_entry()
  args preparation

Commit-ID:  a92fde25231a89d7d10895482556260c1b63767d
Gitweb:     http://git.kernel.org/tip/a92fde25231a89d7d10895482556260c1b63767d
Author:     Denys Vlasenko <dvlasenk@...hat.com>
AuthorDate: Tue, 9 Jun 2015 20:54:09 +0200
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Wed, 10 Jun 2015 08:42:13 +0200

x86/asm/entry/32: Shorten __audit_syscall_entry() args preparation

We use three MOVs to swap edx and ecx. We can use one XCHG
instead.

Expand the comments. It's difficult to keep track which arg#
every register corresponds to, so spell it out.

Signed-off-by: Denys Vlasenko <dvlasenk@...hat.com>
Cc: Alexei Starovoitov <ast@...mgrid.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Andy Lutomirski <luto@...capital.net>
Cc: Borislav Petkov <bp@...en8.de>
Cc: Brian Gerst <brgerst@...il.com>
Cc: Frederic Weisbecker <fweisbec@...il.com>
Cc: H. Peter Anvin <hpa@...or.com>
Cc: Kees Cook <keescook@...omium.org>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Oleg Nesterov <oleg@...hat.com>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Steven Rostedt <rostedt@...dmis.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Will Drewry <wad@...omium.org>
Link: http://lkml.kernel.org/r/1433876051-26604-3-git-send-email-dvlasenk@redhat.com
[ Expanded the comments some more. ]
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 arch/x86/entry/entry_64_compat.S | 27 ++++++++++++++++++---------
 1 file changed, 18 insertions(+), 9 deletions(-)

diff --git a/arch/x86/entry/entry_64_compat.S b/arch/x86/entry/entry_64_compat.S
index 0fa108c..bb187a6 100644
--- a/arch/x86/entry/entry_64_compat.S
+++ b/arch/x86/entry/entry_64_compat.S
@@ -178,17 +178,26 @@ sysexit_from_sys_call:
 
 #ifdef CONFIG_AUDITSYSCALL
 	.macro auditsys_entry_common
-	movl	%esi, %r8d		/* 5th arg: 4th syscall arg */
-	movl	%ecx, %r9d		/* swap with edx */
-	movl	%edx, %ecx		/* 4th arg: 3rd syscall arg */
-	movl	%r9d, %edx		/* 3rd arg: 2nd syscall arg */
-	movl	%ebx, %esi		/* 2nd arg: 1st syscall arg */
-	movl	%eax, %edi		/* 1st arg: syscall number */
+	/*
+	 * At this point, registers hold syscall args in the 32-bit syscall ABI:
+	 * EAX is syscall number, the 6 args are in EBX,ECX,EDX,ESI,EDI,EBP.
+	 *
+	 * We want to pass them to __audit_syscall_entry(), which is a 64-bit
+	 * C function with 5 parameters, so shuffle them to match what
+	 * the function expects: RDI,RSI,RDX,RCX,R8.
+	 */
+	movl	%esi, %r8d		/* arg5 (R8 ) <= 4th syscall arg (ESI) */
+	xchg	%ecx, %edx		/* arg4 (RCX) <= 3rd syscall arg (EDX) */
+					/* arg3 (RDX) <= 2nd syscall arg (ECX) */
+	movl	%ebx, %esi		/* arg2 (RSI) <= 1st syscall arg (EBX) */
+	movl	%eax, %edi		/* arg1 (RDI) <= syscall number  (EAX) */
 	call	__audit_syscall_entry
+
 	/*
-	 * We are going to jump back to syscall dispatch.
-	 * Prepare syscall args as required by 64-bit C ABI.
-	 * Clobbered registers are loaded from pt_regs on stack.
+	 * We are going to jump back to the syscall dispatch code.
+	 * Prepare syscall args as required by the 64-bit C ABI.
+	 * Registers clobbered by __audit_syscall_entry() are
+	 * loaded from pt_regs on stack:
 	 */
 	movl	ORIG_RAX(%rsp), %eax	/* syscall number */
 	movl	%ebx, %edi		/* arg1 */
--
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