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From: | Rugxulo <rugxulo AT gmail DOT com> |
Newsgroups: | comp.os.msdos.djgpp |
Subject: | Re: Please help resurrecting GDB for version 7.0 release |
Date: | Mon, 4 May 2009 22:33:20 -0700 (PDT) |
Organization: | http://groups.google.com |
Lines: | 28 |
Message-ID: | <0ac86821-b47c-4b2d-b7f5-6c60a12986c3@n4g2000vba.googlegroups.com> |
References: | <83zldveryw DOT fsf AT gnu DOT org> <684bdd55-b464-4e61-b28e-28774dc6ced8 AT o27g2000vbd DOT googlegroups DOT com> |
<83y6tfem02 DOT fsf AT gnu DOT org> <_ZKdnV74euw2-2HUnZ2dnUVZ_uednZ2d AT earthlink DOT com> | |
<83ws8zeb05 DOT fsf AT gnu DOT org> <Z4adna6AJcyQeWDUnZ2dnUVZ_t-dnZ2d AT earthlink DOT com> | |
<d5126d62-422a-4cdd-989e-96fa0f99359a AT h23g2000vbc DOT googlegroups DOT com> | |
<83skjldt35 DOT fsf AT gnu DOT org> <58b10f6a-eba5-4cc2-bef8-cc5fc4251e06 AT q2g2000vbr DOT googlegroups DOT com> | |
<83fxfkdz2n DOT fsf AT gnu DOT org> <000b187c-f14b-4f37-81ca-0d93f4e1b2e1 AT g20g2000vba DOT googlegroups DOT com> | |
<322b2e53-eb4a-4770-a039-e4dfe6af8bb7 AT r34g2000vbi DOT googlegroups DOT com> | |
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To: | djgpp AT delorie DOT com |
DJ-Gateway: | from newsgroup comp.os.msdos.djgpp |
Reply-To: | djgpp AT delorie DOT com |
Hi yet again, On May 5, 12:28=A0am, Rugxulo <rugx DOT DOT DOT AT gmail DOT com> wrote: > > On May 5, 12:08=A0am, Rugxulo <rugx DOT DOT DOT AT gmail DOT com> wrote: > > > On May 4, 10:10=A0pm, Eli Zaretskii <e DOT DOT DOT AT gnu DOT org> wrote: > > > In other words, I would've thought you could do the following in ring > > 3, but apparently not: > > > =A0 mov eax,cr4 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0; (CR4 first introduced = in Pentium) > > =A0 bt eax,OSFXSR =A0 =A0 =A0 =A0 =A0 =A0 =A0; if already set, no need = to enable > > =A0 jc .bye > > And yet I just tested again on Vista (since the above was from > memory), and it seems to work! So either I tested wrong, got confused, > or it's a bug in XP (which I can't test at the moment), most likely > one of the former. Fun fun fun. =A0 :-P And by "seems to work", I mean it doesn't cause an exception. Stepping through with GDB (and yes, I used "volatile" just in case) shows that EAX is 0 after the move, so that's not helpful at all. Must be virtualized in ring 3 like eflags is, in other words not reliable at all.
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