d58cd5baa4
SEL_UPL and sometimes PSL_VM. This is just a style change on amd64, but on i386 it fixes 1 unimportant place where the PSL_VM check was missing and starts fixing 1 important place where the PSL_VM check had a logic error. Fix logic errors in treating vm86 bioscall mode as kernel mode. The main place checked all the necessary flags, but put the necessary parentheses for the PSL_VM and PCB_VM86CALL checks in the wrong place. The broken case is only reached if a vm86 bioscall uses a %cs which is nonzero mod 4, but that is unusual -- most bios calls start with %cs = 0xc000 or 0xf000 and rarely change it. Another place was missing the check for PCB_VM86CALL, but was only reachable if there are bugs virtualizing PSL_I. Add a macro TF_HAS_STACKREGS() and use this instead of converting open-coded checks of SEL_UPL, etc. to TRAPF_USERMODE() when we only care about whether the frame has stack registers. This fixes 3 places in my recent fix for register variables in vm86 mode where I messed up the PSL_VM check and cleans up other places.
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