On Tue, Aug 23, 2011 at 12:11:43PM -0400, Andrew Lutomirski wrote: > In any case, this seems insanely overcomplicated. I'd be less afraid > of something like my approach (which, I think, makes all of the > SYSCALL weirdness pretty much transparent to ptrace users) or of just > removing SYSCALL entirely from 32-bit code.
I don't think that removing SYSCALL from 32-bit code just so that UML trapped syscalls work is something we'd like since SYSCALL is much cheaper than INT $0x80: "As a result, SYSCALL and SYSRET can take fewer than one-fourth the number of internal clock cycles to complete than the legacy CALL and RET instructions." http://support.amd.com/us/Processor_TechDocs/24593.pdf, p. 152. I know, it is 32-bit syscall on 64-bit kernel which should be pretty rare but still... Thanks. -- Regards/Gruss, Boris. Advanced Micro Devices GmbH Einsteinring 24, 85609 Dornach GM: Alberto Bozzo Reg: Dornach, Landkreis Muenchen HRB Nr. 43632 WEEE Registernr: 129 19551 ------------------------------------------------------------------------------ Get a FREE DOWNLOAD! and learn more about uberSVN rich system, user administration capabilities and model configuration. Take the hassle out of deploying and managing Subversion and the tools developers use with it. http://p.sf.net/sfu/wandisco-d2d-2 _______________________________________________ User-mode-linux-devel mailing list User-mode-linux-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/user-mode-linux-devel
