http://bugs.winehq.org/show_bug.cgi?id=60230 Bug ID: 60230 Summary: Microsoft Windows Floating Point Application crashes when testing exceptions Product: Wine Version: 11.16 Hardware: x86 OS: Linux Status: NEW Severity: normal Priority: P2 Component: -unknown Assignee: wine-bugs@list.winehq.org Reporter: alexhenrie24@gmail.com Target Milestone: --- Distribution: --- In the Windows 3.1 era, Microsoft developed a program known as either "WinFloat" or "FloatApp" to help programmers verify that floating-point exception handling worked correctly on their computers. I learned about it from the fascinating article at https://www.os2museum.com/wp/failing-to-fail/ - which even has screenshots! And the program comes with a WINFLOAT.HLP file which has lots of documentation about win87em.dll! Unfortunately, FloatApp doesn't work quite right on Wine. To reproduce the problem: 1. Copy winfloat.exe to an otherwise empty directory 2. Run `unzip winfloat.exe` (yes, I know it's an installer, but unzipping it is easier than running it in DOSBox) 3. Run `wine FLOATAPP.EXE` 4. Click the Exceptions menu, and under "App" or "DLL" click "Divide by Zero", "Overflow", "Underflow", or "Invalid" On my real 486 that runs Windows 95, clicking "Divide by Zero" causes a message box to appear that says "Application signal handler detected ZERODIVIDE exception." Clicking "Overflow" causes a message box to appear that says "Application signal handler detected OVERFLOW exception." Interestingly, clicking "Underflow" or "Invalid" does nothing on that PC. The main window says that the 8087 control word is 0x1370 and the Win87Em control word is 0x1332. It makes sense that Underflow wouldn't work because the Underflow mask bit (bit 4) is set in both control words. But the Invalid mask bit (bit 0) is not set in either control word, so I don't know why I'm not getting any Invalid exceptions. On Wine, clicking any of the exceptions in the menu causes the program to crash. The main window says that the 8087 control word is 0x027f and the Win87Em control word is 0x1320. $ sha256sum winfloat.exe 0ddda79599c01664d3f1b8004016f5cf837d2b6f11a25f23eec2e596d96a4cc7 -- Do not reply to this email, post in Bugzilla using the above URL to reply. You are receiving this mail because: You are watching all bug changes.