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| subject: | system lockups |
JD> > JdeBP> Incidentally, the C++ startup for many DOS compilers is still writ > JdeBP> for the 8086 and its bugs, and contains the following sequence : > > JdeBP> cli > JdeBP> mov ss,_seg > JdeBP> mov sp,_off > JdeBP> sti > > JdeBP> So a *lot* of DOS applications Out There will be doing CLIs for no > JdeBP> good reason, in their startup code. > > Isn't this reasonable for a Dos program that runs in a VDM > alongside a TSR? JD> No. AFAIAA the 80286 and later provide means of loading the stack segment and offset together as one atomic operation. As I said, the problem is that many DOS compilers still contain code written for the 8086 and 80186 and their bugs. > JdeBP < ___ X MegaMail 2.10 #0: --- Maximus/2 3.00* Origin: DoNoR/2,Woking UK (44-1483-725167) (2:440/4) SEEN-BY: 105/42 620/243 711/401 409 410 413 430 807 808 809 934 955 712/407 SEEN-BY: 712/515 628 704 713/888 800/1 7877/2809 @PATH: 440/4 141/209 270/101 105/103 42 712/515 711/808 809 934 |
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