linux-kernel - [PATCH v4 04/27] x86: Add macro to get symbol address for PIE support

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Message-Id: <20180529221625.33541-5-thgarnie@google.com>
Date:   Tue, 29 May 2018 15:15:05 -0700
From:   Thomas Garnier <thgarnie@...gle.com>
To:     kernel-hardening@...ts.openwall.com
Cc:     Thomas Garnier <thgarnie@...gle.com>,
        Skip Kees Cook <keescook@...omium.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...hat.com>,
        Andrey Ryabinin <aryabinin@...tuozzo.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-kernel@...r.kernel.org
Subject: [PATCH v4 04/27] x86: Add macro to get symbol address for PIE support

Add a new _ASM_MOVABS macro to fetch a symbol address. It will be used
to replace "_ASM_MOV $<symbol>, %dst" code construct that are not compatible
with PIE.

Signed-off-by: Thomas Garnier <thgarnie@...gle.com>
---
 arch/x86/include/asm/asm.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/x86/include/asm/asm.h b/arch/x86/include/asm/asm.h
index 219faaec51df..4492a35fad69 100644
--- a/arch/x86/include/asm/asm.h
+++ b/arch/x86/include/asm/asm.h
@@ -30,6 +30,7 @@
 #define _ASM_ALIGN	__ASM_SEL(.balign 4, .balign 8)
 
 #define _ASM_MOV	__ASM_SIZE(mov)
+#define _ASM_MOVABS	__ASM_SEL(movl, movabsq)
 #define _ASM_INC	__ASM_SIZE(inc)
 #define _ASM_DEC	__ASM_SIZE(dec)
 #define _ASM_ADD	__ASM_SIZE(add)
-- 
2.17.0.921.gf22659ad46-goog