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Wed, 11 Oct 2017 13:31:08 -0700 (PDT) From: Thomas Garnier To: Herbert Xu , "David S . Miller" , Thomas Gleixner , Ingo Molnar , "H . Peter Anvin" , Peter Zijlstra , Josh Poimboeuf , Arnd Bergmann , Thomas Garnier , Kees Cook , Andrey Ryabinin , Matthias Kaehlcke , Tom Lendacky , Andy Lutomirski , "Kirill A . Shutemov" , Borislav Petkov , "Rafael J . Wysocki" , Len Brown , Pavel Machek , Juergen Gross , Chris Wright , Alok Kataria , Rusty Russell , Tejun Heo , Christoph Lameter , Boris Ostrovsky , Paul Gortmaker , Andrew Morton , Alexey Dobriyan , "Paul E . McKenney" , Nicolas Pitre , Borislav Petkov , "Luis R . Rodriguez" , Greg Kroah-Hartman , Christopher Li , Steven Rostedt , Jason Baron , Mika Westerberg , Dou Liyang , "Rafael J . Wysocki" , Lukas Wunner , Masahiro Yamada , Alexei Starovoitov , Daniel Borkmann , Markus Trippelsdorf , Paolo Bonzini , =?UTF-8?q?Radim=20Kr=C4=8Dm=C3=A1=C5=99?= , Joerg Roedel , Rik van Riel , David Howells , Ard Biesheuvel , Waiman Long , Kyle Huey , Jonathan Corbet , Michal Hocko , Peter Foley , Paul Bolle , Jiri Kosina , "H . J . Lu" , Rob Landley , Baoquan He , =?UTF-8?q?Jan=20H=20=2E=20Sch=C3=B6nherr?= , Daniel Micay Date: Wed, 11 Oct 2017 13:30:04 -0700 Message-Id: <20171011203027.11248-5-thgarnie@google.com> X-Mailer: git-send-email 2.15.0.rc0.271.g36b669edcc-goog In-Reply-To: <20171011203027.11248-1-thgarnie@google.com> References: <20171011203027.11248-1-thgarnie@google.com> Cc: linux-arch@vger.kernel.org, kvm@vger.kernel.org, linux-pm@vger.kernel.org, x86@kernel.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, virtualization@lists.linux-foundation.org, linux-sparse@vger.kernel.org, linux-crypto@vger.kernel.org, kernel-hardening@lists.openwall.com, xen-devel@lists.xenproject.org Subject: [Xen-devel] [PATCH v1 04/27] x86: Add macro to get symbol address for PIE support X-BeenThere: xen-devel@lists.xen.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Errors-To: xen-devel-bounces@lists.xen.org Sender: "Xen-devel" X-Virus-Scanned: ClamAV using ClamSMTP Add a new _ASM_GET_PTR macro to fetch a symbol address. It will be used to replace "_ASM_MOV $, %dst" code construct that are not compatible with PIE. Signed-off-by: Thomas Garnier --- arch/x86/include/asm/asm.h | 13 +++++++++++++ 1 file changed, 13 insertions(+) diff --git a/arch/x86/include/asm/asm.h b/arch/x86/include/asm/asm.h index b0dc91f4bedc..6de365b8e3fd 100644 --- a/arch/x86/include/asm/asm.h +++ b/arch/x86/include/asm/asm.h @@ -57,6 +57,19 @@ # define CC_OUT(c) [_cc_ ## c] "=qm" #endif +/* Macros to get a global variable address with PIE support on 64-bit */ +#ifdef CONFIG_X86_32 +#define __ASM_GET_PTR_PRE(_src) __ASM_FORM_COMMA(movl $##_src) +#else +#ifdef __ASSEMBLY__ +#define __ASM_GET_PTR_PRE(_src) __ASM_FORM_COMMA(leaq (_src)(%rip)) +#else +#define __ASM_GET_PTR_PRE(_src) __ASM_FORM_COMMA(leaq (_src)(%%rip)) +#endif +#endif +#define _ASM_GET_PTR(_src, _dst) \ + __ASM_GET_PTR_PRE(_src) __ASM_FORM(_dst) + /* Exception table entry */ #ifdef __ASSEMBLY__ # define _ASM_EXTABLE_HANDLE(from, to, handler) \