Date: Tue, 27 Jun 2006 10:01:09 GMT From: Roman Divacky <rdivacky@FreeBSD.org> To: Perforce Change Reviews <perforce@FreeBSD.org> Subject: PERFORCE change 100128 for review Message-ID: <200606271001.k5RA19aY017998@repoman.freebsd.org>
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http://perforce.freebsd.org/chv.cgi?CH=100128 Change 100128 by rdivacky@rdivacky_witten on 2006/06/27 10:00:32 Non-functional change - add some real args handler and comment to linux_set_thread_area(), note that this is actually a regression and WIP. Affected files ... .. //depot/projects/soc2006/rdivacky_linuxolator/i386/linux/linux_machdep.c#5 edit Differences ... ==== //depot/projects/soc2006/rdivacky_linuxolator/i386/linux/linux_machdep.c#5 (text+ko) ==== @@ -848,11 +848,33 @@ int linux_set_thread_area(struct thread *td, struct linux_set_thread_area_args *args) { - /* - * Return an error code instead of raising a SIGSYS so that - * the caller will fall back to simpler LDT methods. + struct l_user_desc info; + int error; + int idx; + + error = copyin(args->desc, &info, sizeof(struct l_user_desc)); + if (error) + return (error); + + idx = info.entry_number; + /* Semantics of linux version: every thread in the system has array + * of 3 tls descriptors. 1st is GLIBC TLS, 2nd is WINE, 3rd unknown. This + * syscall loads one of the selected tls decriptors with a value + * and also loads GDT descriptors 6, 7 and 8 with the content of the per-thread + * descriptors. + * + * Semantics of fbsd version: I think we can ignore that linux has 3 per-thread + * descriptors and use just the 1st one (TODO: davidxu will report us where we get this). + * The tls_array[] is used only in set/get-thread_area() syscalls and for loading the + * GDT descriptors. In fbsd we use just one GDT descriptor for TLS so we will load + * just one. */ - return (ENOSYS); + + /* we support just GLIBC TLS now */ + if (idx != 6 && idx != -1) + return (EINVAL); + + return (0); } int
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