On Sunday 13 November 2005 20:32, Jeff Dike wrote: > On Sat, Nov 12, 2005 at 07:36:41PM -0600, Rob Landley wrote: > > Stub registers - > > 0 - 9090909090909090 > > 1 - 9090909090909090 > > 2 - 9090909090909090 > > 3 - 9090909090909090 > > 4 - 9090909090909090 > > 5 - 9090909090909090 > > 6 - 9090909090909090 > > 7 - 9090909090909090 > > 8 - 9090909090909090 > > 9 - 9090909090909090 > > 10 - 0 > > 11 - 9090909090909090 > > 12 - 9090909090909090 > > 13 - 9090909090909090 > > 14 - 9090909090909090 > > 15 - ffffffffffffffff > > 16 - 9090909090909090 > > 17 - 33 > > 18 - 292 > > 19 - 9090909090909090 > > 20 - 2b > > I remain baffled by this. There is nothing valid there. At the very least > RSP and RIP should be reasonable, and they're not.
Jeff, given the current state, I think that we need a look at the disassembly - or better: *) build a 2.6.15-rc1 binary with Rob's config. *) test that it works *) send him and see if it works for him *) finally, conclude GCC is misassembling stuff and take measures for this case. Meanwhile, Rob, can you provide the disassembly? We need to look at disassembled arch/um/sys-x86_64/stub_segv.c arch/um/kernel/skas/clone.c, i.e. stub_segv_handler() and stub_clone_handler(). * Also, about the miscompilation bug you described: is it caused by GCC saving the "from" value (UML_CONFIG_STUB_DATA) on the stack and re-loading it? * Ah, Jeff, while giving a casual look: should I remove x86_64 "syscall_stub" label from stub.S, since it should be unused (replaced by batch_syscall_stub), doesn't exist for 386 and the content is bogus? -- Inform me of my mistakes, so I can keep imitating Homer Simpson's "Doh!". Paolo Giarrusso, aka Blaisorblade (Skype ID "PaoloGiarrusso", ICQ 215621894) http://www.user-mode-linux.org/~blaisorblade ___________________________________ Yahoo! Messenger: chiamate gratuite in tutto il mondo http://it.messenger.yahoo.com ------------------------------------------------------- SF.Net email is sponsored by: Tame your development challenges with Apache's Geronimo App Server. Download it for free - -and be entered to win a 42" plasma tv or your very own Sony(tm)PSP. Click here to play: http://sourceforge.net/geronimo.php _______________________________________________ User-mode-linux-devel mailing list User-mode-linux-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/user-mode-linux-devel
