[tip: x86/asm] x86/asm: Add _ASM_BYTES() macro for a .byte ... opcode sequence

[tip-bot2 for H. Peter Anvin (Intel)]

The following commit has been merged into the x86/asm branch of tip:

Commit-ID:     d88be187a6e6f3a97dfa7ddc500bb9ca191b3772
Gitweb:        https://git.kernel.org/tip/d88be187a6e6f3a97dfa7ddc500bb9ca191b3772
Author:        H. Peter Anvin (Intel) <hpa@xxxxxxxxx>
AuthorDate:    Mon, 10 May 2021 02:09:39 -07:00
Committer:     Ingo Molnar <mingo@xxxxxxxxxx>
CommitterDate: Mon, 10 May 2021 12:33:28 +02:00

x86/asm: Add _ASM_BYTES() macro for a .byte ... opcode sequence

Make it easy to create a sequence of bytes that can be used in either
assembly proper on in a C asm() statement.

Signed-off-by: H. Peter Anvin (Intel) <hpa@xxxxxxxxx>
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20210510090940.924953-3-hpa@xxxxxxxxx
---
 arch/x86/include/asm/asm.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/x86/include/asm/asm.h b/arch/x86/include/asm/asm.h
index 93aad0b..507a37a 100644
--- a/arch/x86/include/asm/asm.h
+++ b/arch/x86/include/asm/asm.h
@@ -13,6 +13,8 @@
 # define __ASM_FORM_COMMA(x, ...)	" " __stringify(x,##__VA_ARGS__) ","
 #endif
 
+#define _ASM_BYTES(x, ...)	__ASM_FORM(.byte x,##__VA_ARGS__ ;)
+
 #ifndef __x86_64__
 /* 32 bit */
 # define __ASM_SEL(a,b)		__ASM_FORM(a)