linux-kernel - [tip:x86/urgent] x86/asm: Add _ASM_ARG* constants for argument registers to <asm/asm.h>

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Message-ID: <tip-0e2e160033283e20f688d8bad5b89460cc5bfcc4@git.kernel.org>
Date:   Tue, 3 Jul 2018 08:59:40 -0700
From:   "tip-bot for H. Peter Anvin" <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     sedat.dilek@...il.com, linux-kernel@...r.kernel.org,
        jgross@...e.com, tglx@...utronix.de, hpa@...ux.intel.com,
        mingo@...nel.org, peterz@...radead.org,
        torvalds@...ux-foundation.org, hpa@...or.com,
        ndesaulniers@...gle.com
Subject: [tip:x86/urgent] x86/asm: Add _ASM_ARG* constants for argument
 registers to <asm/asm.h>

Commit-ID:  0e2e160033283e20f688d8bad5b89460cc5bfcc4
Gitweb:     https://git.kernel.org/tip/0e2e160033283e20f688d8bad5b89460cc5bfcc4
Author:     H. Peter Anvin <hpa@...ux.intel.com>
AuthorDate: Thu, 21 Jun 2018 09:23:23 -0700
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Tue, 3 Jul 2018 10:56:27 +0200

x86/asm: Add _ASM_ARG* constants for argument registers to <asm/asm.h>

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

diff --git a/arch/x86/include/asm/asm.h b/arch/x86/include/asm/asm.h
index 219faaec51df..990770f9e76b 100644
--- a/arch/x86/include/asm/asm.h
+++ b/arch/x86/include/asm/asm.h
@@ -46,6 +46,65 @@
 #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
+
 /*
  * Macros to generate condition code outputs from inline assembly,
  * The output operand must be type "bool".