linux-kernel - [PATCH 1/4] x86, putuser: add ASM_CALL

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Message-ID: <20190316210127.GA21830@avx2>
Date:   Sun, 17 Mar 2019 00:01:27 +0300
From:   Alexey Dobriyan <adobriyan@...il.com>
To:     tglx@...utronix.de, mingo@...hat.com, bp@...en8.de, hpa@...or.com
Cc:     x86@...nel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 1/4] x86, putuser: add ASM_CALL_CONSTRAINT

Clobber stack pointer given that assembly does CALL.

Signed-off-by: Alexey Dobriyan <adobriyan@...il.com>
---

 arch/x86/include/asm/uaccess.h |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/arch/x86/include/asm/uaccess.h
+++ b/arch/x86/include/asm/uaccess.h
@@ -176,7 +176,8 @@ __typeof__(__builtin_choose_expr(sizeof(x) > sizeof(0UL), 0ULL, 0UL))
 })
 
 #define __put_user_x(size, x, ptr, __ret_pu)			\
-	asm volatile("call __put_user_" #size : "=a" (__ret_pu)	\
+	asm volatile("call __put_user_" #size			\
+		     : "=a" (__ret_pu), ASM_CALL_CONSTRAINT	\
 		     : "0" ((typeof(*(ptr)))(x)), "c" (ptr) : "ebx")