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From:   Thomas Garnier <thgarnie@chromium.org>
To:     kernel-hardening@lists.openwall.com
Cc:     kristen@linux.intel.com, Thomas Garnier <thgarnie@chromium.org>,
        Thomas Gleixner <tglx@linutronix.de>,
        Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
        "H. Peter Anvin" <hpa@zytor.com>, x86@kernel.org,
        "Peter Zijlstra (Intel)" <peterz@infradead.org>,
        Thomas Garnier <thgarnie@google.com>,
        Alexey Dobriyan <adobriyan@gmail.com>,
        Nadav Amit <namit@vmware.com>, linux-kernel@vger.kernel.org
Subject: [PATCH v6 12/27] x86/alternatives: Adapt assembly for PIE support
Date:   Thu, 31 Jan 2019 11:24:19 -0800
Message-Id: <20190131192533.34130-13-thgarnie@chromium.org>
In-Reply-To: <20190131192533.34130-1-thgarnie@chromium.org>
References: <20190131192533.34130-1-thgarnie@chromium.org>
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Change the assembly options to work with pointers instead of integers.

Position Independent Executable (PIE) support will allow to extend the
KASLR randomization range below 0xffffffff80000000.

Signed-off-by: Thomas Garnier <thgarnie@chromium.org>
---
 arch/x86/include/asm/alternative.h | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/arch/x86/include/asm/alternative.h b/arch/x86/include/asm/alternative.h
index 4c74073a19cc..f5d6fe1d294b 100644
--- a/arch/x86/include/asm/alternative.h
+++ b/arch/x86/include/asm/alternative.h
@@ -233,7 +233,7 @@ static inline int alternatives_text_reserved(void *start, void *end)
 /* Like alternative_io, but for replacing a direct call with another one. */
 #define alternative_call(oldfunc, newfunc, feature, output, input...)	\
 	asm volatile (ALTERNATIVE("call %P[old]", "call %P[new]", feature) \
-		: output : [old] "i" (oldfunc), [new] "i" (newfunc), ## input)
+		: output : [old] "X" (oldfunc), [new] "X" (newfunc), ## input)
 
 /*
  * Like alternative_call, but there are two features and respective functions.
@@ -246,8 +246,8 @@ static inline int alternatives_text_reserved(void *start, void *end)
 	asm volatile (ALTERNATIVE_2("call %P[old]", "call %P[new1]", feature1,\
 		"call %P[new2]", feature2)				      \
 		: output, ASM_CALL_CONSTRAINT				      \
-		: [old] "i" (oldfunc), [new1] "i" (newfunc1),		      \
-		  [new2] "i" (newfunc2), ## input)
+		: [old] "X" (oldfunc), [new1] "X" (newfunc1),		      \
+		  [new2] "X" (newfunc2), ## input)
 
 /*
  * use this macro(s) if you need more than one output parameter
-- 
2.20.1.495.gaa96b0ce6b-goog