Sorry about previous e-mail, my mail client decided to ambush me.
QEMU does not correctly handle jumps to TSS segments, the code in
switch_tss loads new eflags, but cc_op is never set to CC_OP_EFLAGS.
The problem manifests itself when trying to run DJGPP binaries
compressed with UPX. It goes something like this:
sub esi, 0FFFFFFFCh
adc ebx, ebx
loc_169: ; CODE XREF: start+1B
mov al, [edi] ; <-- exception
jb short loc_158
mov eax, 1
When using default DJGPPs DPMI provider (CWSDPMI) the following code
takes the wrong route in `jb' due to interrupt handler exiting via
jump to TSS (and QEMU not setting cc_op) properly.
Attached patch cures this, however i'm not sure that it's the best
way of doing that nor that it is comprehensive.
Sincerely,
malc
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