linux-kernel - [PATCH v7 03/12] x86: Add macro to get symbol address for PIE support

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Message-Id: <20190520231948.49693-4-thgarnie@chromium.org>
Date:   Mon, 20 May 2019 16:19:28 -0700
From:   Thomas Garnier <thgarnie@...omium.org>
To:     kernel-hardening@...ts.openwall.com
Cc:     kristen@...ux.intel.com, Thomas Garnier <thgarnie@...gle.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
        Peter Zijlstra <peterz@...radead.org>,
        Nadav Amit <namit@...are.com>, Jann Horn <jannh@...gle.com>,
        linux-kernel@...r.kernel.org
Subject: [PATCH v7 03/12] x86: Add macro to get symbol address for PIE support

From: Thomas Garnier <thgarnie@...gle.com>

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 3ff577c0b102..3a686057e882 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)
-- 
2.21.0.1020.gf2820cf01a-goog