Date: Fri, 8 Feb 2008 05:26:09 GMT From: John Birrell <jb@FreeBSD.org> To: Perforce Change Reviews <perforce@freebsd.org> Subject: PERFORCE change 135013 for review Message-ID: <200802080526.m185Q9pK090684@repoman.freebsd.org>
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http://perforce.freebsd.org/chv.cgi?CH=135013 Change 135013 by jb@jb_freebsd1 on 2008/02/08 05:25:18 Add a DTrace-specific lock function copied from atomic.h but named so that an fbt probe enabled function isn't called from the DTrace probe context (which would cause a double fault). Affected files ... .. //depot/projects/dtrace/src/sys/cddl/dev/dtrace/dtrace_debug.c#3 edit Differences ... ==== //depot/projects/dtrace/src/sys/cddl/dev/dtrace/dtrace_debug.c#3 (text+ko) ==== @@ -52,6 +52,27 @@ return (res); } +#elif defined(__i386__) +static __inline int +dtrace_cmpset_long(volatile u_long *dst, u_long exp, u_long src) +{ + u_char res; + + __asm __volatile( + " " lock " " + " cmpxchgl %2,%1 ; " + " sete %0 ; " + "1: " + "# dtrace_cmpset_long" + : "=a" (res), /* 0 */ + "=m" (*dst) /* 1 */ + : "r" (src), /* 2 */ + "a" (exp), /* 3 */ + "m" (*dst) /* 4 */ + : "memory"); + + return (res); +} #endif #define DTRACE_DEBUG_BUFR_SIZE (32 * 1024)
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