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x86/asm: Add _ASM_RIP() macro for x86-64 (%rip) suffix

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From: "H. Peter Anvin (Intel)" <hpa@zytor.com>

commit f87bc8dc7a7c438c70f97b4e51c76a183313272e upstream.

Add a macro _ASM_RIP() to add a (%rip) suffix on 64 bits only. This is
useful for immediate memory references where one doesn't want gcc
to possibly use a register indirection as it may in the case of an "m"
constraint.

Signed-off-by: H. Peter Anvin (Intel) <hpa@zytor.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Signed-off-by: Pawan Gupta <pawan.kumar.gupta@linux.intel.com>
Link: https://lkml.kernel.org/r/20210910195910.2542662-3-hpa@zytor.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Pawan Gupta 2024-03-12 15:40:27 -07:00 committed by Greg Kroah-Hartman
parent b422358490
commit 8b20c6f894
1 changed files with 5 additions and 0 deletions
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5
arch/x86/include/asm/asm.h
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@ -6,12 +6,14 @@
# define __ASM_FORM(x) x
# define __ASM_FORM_RAW(x) x
# define __ASM_FORM_COMMA(x) x,
# define __ASM_REGPFX %
#else
#include <linux/stringify.h>
# define __ASM_FORM(x) " " __stringify(x) " "
# define __ASM_FORM_RAW(x) __stringify(x)
# define __ASM_FORM_COMMA(x) " " __stringify(x) ","
# define __ASM_REGPFX %%
#endif
#ifndef __x86_64__
@ -48,6 +50,9 @@
#define _ASM_SI __ASM_REG(si)
#define _ASM_DI __ASM_REG(di)
/* Adds a (%rip) suffix on 64 bits only; for immediate memory references */
#define _ASM_RIP(x) __ASM_SEL_RAW(x, x (__ASM_REGPFX rip))
#ifndef __x86_64__
/* 32 bit */