Messages in this thread | | | Date | Sun, 29 Jun 2008 20:07:39 -0400 | From | Bill Davidsen <> | Subject | Re: Various x86 syscall mechanisms |
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Roland McGrath wrote: >> As far as I can work out, an x86_32 kernel will use "int 0x80" and >> "sysenter" for system calls. 64-bit kernel will use just "syscall" for >> 64-bit processes (though you can use "int 0x80" to access the 32-bit >> syscall interface from a 64-bit process), but will allow "sysenter", >> "syscall" or "int 0x80" for 32-on-64 processes. > > That is correct, with the caveats below. > Thanks for setting this out clearly, I've seen most of it (from Andi, I think) in bits, and one of the scheduler folk had a comment relevant to scheduling which I can't find now, but this is both technical and historical, and thus a nice thing to hand to someone with a related question.
Well done.
-- Bill Davidsen <davidsen@tmr.com> "We have more to fear from the bungling of the incompetent than from the machinations of the wicked." - from Slashdot
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