linux-kernel - [PATCH 4.4 05/31] x86/asm: Add _ASM_ARG* constants for argument registers to <asm/asm.h>

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Message-Id: <20180720121340.351022699@linuxfoundation.org>
Date:   Fri, 20 Jul 2018 14:13:35 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, "H. Peter Anvin" <hpa@...ux.intel.com>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Sedat Dilek <sedat.dilek@...il.com>,
        Juergen Gross <jgross@...e.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>, acme@...hat.com,
        akataria@...are.com, akpm@...ux-foundation.org,
        andrea.parri@...rulasolutions.com, ard.biesheuvel@...aro.org,
        arnd@...db.de, aryabinin@...tuozzo.com, astrachan@...gle.com,
        boris.ostrovsky@...cle.com, brijesh.singh@....com,
        caoj.fnst@...fujitsu.com, geert@...ux-m68k.org,
        ghackmann@...gle.com, jan.kiszka@...mens.com,
        jarkko.sakkinen@...ux.intel.com, joe@...ches.com,
        jpoimboe@...hat.com, keescook@...gle.com,
        kirill.shutemov@...ux.intel.com, kstewart@...uxfoundation.org,
        linux-efi@...r.kernel.org, linux-kbuild@...r.kernel.org,
        manojgupta@...gle.com, mawilcox@...rosoft.com,
        michal.lkml@...kovi.net, mjg59@...gle.com, mka@...omium.org,
        pombredanne@...b.com, rientjes@...gle.com, rostedt@...dmis.org,
        thomas.lendacky@....com, tstellar@...hat.com, tweek@...gle.com,
        virtualization@...ts.linux-foundation.org, will.deacon@....com,
        yamada.masahiro@...ionext.com, Ingo Molnar <mingo@...nel.org>
Subject: [PATCH 4.4 05/31] x86/asm: Add _ASM_ARG* constants for argument registers to <asm/asm.h>

4.4-stable review patch.  If anyone has any objections, please let me know.

------------------

From: H. Peter Anvin <hpa@...ux.intel.com>

commit 0e2e160033283e20f688d8bad5b89460cc5bfcc4 upstream.

i386 and x86-64 uses different registers for arguments; make them
available so we don't have to #ifdef in the actual code.

Native size and specified size (q, l, w, b) versions are provided.

Signed-off-by: H. Peter Anvin <hpa@...ux.intel.com>
Signed-off-by: Nick Desaulniers <ndesaulniers@...gle.com>
Reviewed-by: Sedat Dilek <sedat.dilek@...il.com>
Acked-by: Juergen Gross <jgross@...e.com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: acme@...hat.com
Cc: akataria@...are.com
Cc: akpm@...ux-foundation.org
Cc: andrea.parri@...rulasolutions.com
Cc: ard.biesheuvel@...aro.org
Cc: arnd@...db.de
Cc: aryabinin@...tuozzo.com
Cc: astrachan@...gle.com
Cc: boris.ostrovsky@...cle.com
Cc: brijesh.singh@....com
Cc: caoj.fnst@...fujitsu.com
Cc: geert@...ux-m68k.org
Cc: ghackmann@...gle.com
Cc: gregkh@...uxfoundation.org
Cc: jan.kiszka@...mens.com
Cc: jarkko.sakkinen@...ux.intel.com
Cc: joe@...ches.com
Cc: jpoimboe@...hat.com
Cc: keescook@...gle.com
Cc: kirill.shutemov@...ux.intel.com
Cc: kstewart@...uxfoundation.org
Cc: linux-efi@...r.kernel.org
Cc: linux-kbuild@...r.kernel.org
Cc: manojgupta@...gle.com
Cc: mawilcox@...rosoft.com
Cc: michal.lkml@...kovi.net
Cc: mjg59@...gle.com
Cc: mka@...omium.org
Cc: pombredanne@...b.com
Cc: rientjes@...gle.com
Cc: rostedt@...dmis.org
Cc: thomas.lendacky@....com
Cc: tstellar@...hat.com
Cc: tweek@...gle.com
Cc: virtualization@...ts.linux-foundation.org
Cc: will.deacon@....com
Cc: yamada.masahiro@...ionext.com
Link: http://lkml.kernel.org/r/20180621162324.36656-3-ndesaulniers@google.com
Signed-off-by: Ingo Molnar <mingo@...nel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 arch/x86/include/asm/asm.h |   59 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 59 insertions(+)

--- a/arch/x86/include/asm/asm.h
+++ b/arch/x86/include/asm/asm.h
@@ -44,6 +44,65 @@
 #define _ASM_SI		__ASM_REG(si)
 #define _ASM_DI		__ASM_REG(di)

+#ifndef __x86_64__
+/* 32 bit */
+
+#define _ASM_ARG1	_ASM_AX
+#define _ASM_ARG2	_ASM_DX
+#define _ASM_ARG3	_ASM_CX
+
+#define _ASM_ARG1L	eax
+#define _ASM_ARG2L	edx
+#define _ASM_ARG3L	ecx
+
+#define _ASM_ARG1W	ax
+#define _ASM_ARG2W	dx
+#define _ASM_ARG3W	cx
+
+#define _ASM_ARG1B	al
+#define _ASM_ARG2B	dl
+#define _ASM_ARG3B	cl
+
+#else
+/* 64 bit */
+
+#define _ASM_ARG1	_ASM_DI
+#define _ASM_ARG2	_ASM_SI
+#define _ASM_ARG3	_ASM_DX
+#define _ASM_ARG4	_ASM_CX
+#define _ASM_ARG5	r8
+#define _ASM_ARG6	r9
+
+#define _ASM_ARG1Q	rdi
+#define _ASM_ARG2Q	rsi
+#define _ASM_ARG3Q	rdx
+#define _ASM_ARG4Q	rcx
+#define _ASM_ARG5Q	r8
+#define _ASM_ARG6Q	r9
+
+#define _ASM_ARG1L	edi
+#define _ASM_ARG2L	esi
+#define _ASM_ARG3L	edx
+#define _ASM_ARG4L	ecx
+#define _ASM_ARG5L	r8d
+#define _ASM_ARG6L	r9d
+
+#define _ASM_ARG1W	di
+#define _ASM_ARG2W	si
+#define _ASM_ARG3W	dx
+#define _ASM_ARG4W	cx
+#define _ASM_ARG5W	r8w
+#define _ASM_ARG6W	r9w
+
+#define _ASM_ARG1B	dil
+#define _ASM_ARG2B	sil
+#define _ASM_ARG3B	dl
+#define _ASM_ARG4B	cl
+#define _ASM_ARG5B	r8b
+#define _ASM_ARG6B	r9b
+
+#endif
+
 /* Exception table entry */
 #ifdef __ASSEMBLY__
 # define _ASM_EXTABLE(from,to)					\