linux-kernel - [PATCH v5 2/3] x86/asm: add _ASM_ARG* constants for argument registers to <asm/asm.h>

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20180613210518.113983-3-ndesaulniers@google.com>
Date:   Wed, 13 Jun 2018 14:05:17 -0700
From:   Nick Desaulniers <ndesaulniers@...gle.com>
To:     akpm@...ux-foundation.org, hpa@...or.com, mingo@...hat.com,
        tglx@...utronix.de
Cc:     linux-efi@...r.kernel.org, linux-kernel@...r.kernel.org,
        x86@...nel.org, virtualization@...ts.linux-foundation.org,
        astrachan@...gle.com, manojgupta@...gle.com, ghackmann@...gle.com,
        sedat.dilek@...il.com, tstellar@...hat.com, keescook@...gle.com,
        yamada.masahiro@...ionext.com, michal.lkml@...kovi.net,
        linux-kbuild@...r.kernel.org, geert@...ux-m68k.org,
        will.deacon@....com, mawilcox@...rosoft.com, arnd@...db.de,
        rientjes@...gle.com, acme@...hat.com, pombredanne@...b.com,
        aryabinin@...tuozzo.com, kstewart@...uxfoundation.org,
        boris.ostrovsky@...cle.com, jan.kiszka@...mens.com,
        rostedt@...dmis.org, kirill.shutemov@...ux.intel.com,
        ard.biesheuvel@...aro.org, akataria@...are.com,
        brijesh.singh@....com, caoj.fnst@...fujitsu.com,
        gregkh@...uxfoundation.org, jarkko.sakkinen@...ux.intel.com,
        jgross@...e.com, jpoimboe@...hat.com, mka@...omium.org,
        ndesaulniers@...gle.com, thomas.lendacky@....com, tweek@...gle.com,
        mjg59@...gle.com, joe@...ches.com,
        andrea.parri@...rulasolutions.com,
        "H. Peter Anvin" <hpa@...ux.intel.com>
Subject: [PATCH v5 2/3] x86/asm: add _ASM_ARG* constants for argument registers to <asm/asm.h>

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

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.

Suggested-by: Sedat Dilek <sedat.dilek@...il.com>
Signed-off-by: H. Peter Anvin <hpa@...ux.intel.com>
Signed-off-by: Nick Desaulniers <ndesaulniers@...gle.com>
---
 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".
-- 
2.18.0.rc1.244.gcf134e6275-goog