Date: Mon, 27 Mar 2017 16:18:20 +0000 (UTC) From: Mark Johnston <markj@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r316031 - head/sys/i386/include Message-ID: <201703271618.v2RGIKtl063579@repo.freebsd.org>
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Author: markj Date: Mon Mar 27 16:18:19 2017 New Revision: 316031 URL: https://svnweb.freebsd.org/changeset/base/316031 Log: Adjust the constraint for "src" in atomic_(f)cmpset_8. "r" is not sufficient to prevent the use of invalid byte-width registers with at least gcc. Reported and reviewed by: bde X-MFC-With: r315718 Modified: head/sys/i386/include/atomic.h Modified: head/sys/i386/include/atomic.h ============================================================================== --- head/sys/i386/include/atomic.h Mon Mar 27 16:01:44 2017 (r316030) +++ head/sys/i386/include/atomic.h Mon Mar 27 16:18:19 2017 (r316031) @@ -182,7 +182,7 @@ struct __hack * * Returns 0 on failure, non-zero on success. */ -#define ATOMIC_CMPSET(TYPE) \ +#define ATOMIC_CMPSET(TYPE, CONS) \ static __inline int \ atomic_cmpset_##TYPE(volatile u_##TYPE *dst, u_##TYPE expect, u_##TYPE src) \ { \ @@ -196,7 +196,7 @@ atomic_cmpset_##TYPE(volatile u_##TYPE * : "=q" (res), /* 0 */ \ "+m" (*dst), /* 1 */ \ "+a" (expect) /* 2 */ \ - : "r" (src) /* 3 */ \ + : CONS (src) /* 3 */ \ : "memory", "cc"); \ return (res); \ } \ @@ -214,14 +214,14 @@ atomic_fcmpset_##TYPE(volatile u_##TYPE : "=q" (res), /* 0 */ \ "+m" (*dst), /* 1 */ \ "+a" (*expect) /* 2 */ \ - : "r" (src) /* 3 */ \ + : CONS (src) /* 3 */ \ : "memory", "cc"); \ return (res); \ } -ATOMIC_CMPSET(char); -ATOMIC_CMPSET(short); -ATOMIC_CMPSET(int); +ATOMIC_CMPSET(char, "q"); +ATOMIC_CMPSET(short, "r"); +ATOMIC_CMPSET(int, "r"); /* * Atomically add the value of v to the integer pointed to by p and return
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