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[Bug 1738434] Re: CALL FWORD PTR [ESP] handled incorrectly
From: |
Thomas Huth |
Subject: |
[Bug 1738434] Re: CALL FWORD PTR [ESP] handled incorrectly |
Date: |
Tue, 10 Nov 2020 18:01:33 -0000 |
The QEMU project is currently considering to move its bug tracking to another
system. For this we need to know which bugs are still valid and which could be
closed already. Thus we are setting older bugs to "Incomplete" now.
If you still think this bug report here is valid, then please switch the state
back to "New" within the next 60 days, otherwise this report will be marked as
"Expired". Or mark it as "Fix Released" if the problem has been solved with a
newer version of QEMU already. Thank you and sorry for the inconvenience.
** Changed in: qemu
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1738434
Title:
CALL FWORD PTR [ESP] handled incorrectly
Status in QEMU:
Incomplete
Bug description:
To keep the story short, this 32-bit code crashes on 64-bit Windows
whereas it works fine on real system and VMware:
push 33h
push offset _far_call
call fword ptr[esp]
jmp _ret
_far_call:
retf
_ret:
32-bit code running under WoW64 on 64-bit Windows has the ability to
switch to the 64-bit mode via so called "Heaven's gate". In order to
do that you have to make a far call/jmp by 0x33 selector how the code
snippet above shows. QEMU throws an access violation exception whereas
the code snippet runs with no problems on real CPU and VMware. By the
way, this code works fine under QEMU, I hope it gives you a hint where
to look:
push 23h
push offset _far_call
call fword ptr[esp]
jmp _ret
_far_call:
retf
_ret:
0x23 is a default 32-bit selector for 32-bit processes running under
WoW64.
Environment:
QEMU: 2.10.93, command line: qemu-system-x86_64.exe -m 2G -snapshot -cdrom
full_path_to_iso fullP_path_to_img
Guest OS: Windows 7 x64 SP1 build 7601 or Windows 10 version 1709 build
16299.19
Host OS: Windows 10 x64 version 1703 build 15063.786
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