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

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@linux.intel.com>
Signed-off-by: Nick Desaulniers <ndesaulniers@google.com>
Reviewed-by: Sedat Dilek <sedat.dilek@gmail.com>
Acked-by: Juergen Gross <jgross@suse.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: acme@redhat.com
Cc: akataria@vmware.com
Cc: akpm@linux-foundation.org
Cc: andrea.parri@amarulasolutions.com
Cc: ard.biesheuvel@linaro.org
Cc: arnd@arndb.de
Cc: aryabinin@virtuozzo.com
Cc: astrachan@google.com
Cc: boris.ostrovsky@oracle.com
Cc: brijesh.singh@amd.com
Cc: caoj.fnst@cn.fujitsu.com
Cc: geert@linux-m68k.org
Cc: ghackmann@google.com
Cc: gregkh@linuxfoundation.org
Cc: jan.kiszka@siemens.com
Cc: jarkko.sakkinen@linux.intel.com
Cc: joe@perches.com
Cc: jpoimboe@redhat.com
Cc: keescook@google.com
Cc: kirill.shutemov@linux.intel.com
Cc: kstewart@linuxfoundation.org
Cc: linux-efi@vger.kernel.org
Cc: linux-kbuild@vger.kernel.org
Cc: manojgupta@google.com
Cc: mawilcox@microsoft.com
Cc: michal.lkml@markovi.net
Cc: mjg59@google.com
Cc: mka@chromium.org
Cc: pombredanne@nexb.com
Cc: rientjes@google.com
Cc: rostedt@goodmis.org
Cc: thomas.lendacky@amd.com
Cc: tstellar@redhat.com
Cc: tweek@google.com
Cc: virtualization@lists.linux-foundation.org
Cc: will.deacon@arm.com
Cc: yamada.masahiro@socionext.com
Link: http://lkml.kernel.org/r/20180621162324.36656-3-ndesaulniers@google.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/arch/x86/include/asm/asm.h b/arch/x86/include/asm/asm.h
index 386a690..3bf87f9 100644 (file)
--- 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".