x86 LAHF indeterminated bits?

Posted on 2019-02-23, 12:15

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by superfury

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What are the values of the indeterminate bits in AH after an LAHF? Are they always the sticky flags of the FLAGS register, all cleared, all set or are they all whatever was in AH before executing LAHF(so just modifying the defined bits that are documented in EFLAGS)? So what's in AH bits 1,3,5 after …

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Re: Any good MS-DOS 80386/80486 games for testing Virtual memory support?

Posted on 2019-02-22, 16:09

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by superfury

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Just now trying to run Descent. I see it at least page faulting some times, as well as reporting something it calls Virtual memory? Said memory addresses are just past the 1GB virtual memory(at address 1XXXXXXXh)? At least during the intro? Edit: I also see it task switching during Page Faults(using …

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Re: UniPCemu Linux and Android NDK issues?

Posted on 2019-02-22, 15:48

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by superfury

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Now largely replaced all fopen and related function calls with my emulator's emufopen64 and related function calls(which convert it to a SDL_RWops call) for maximum compatbility. The only issue with that is that some calls(for parsing two text files when starting) require fscanf, which I can't …

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Re: Android NDK fseeko/ftello undefined on 32-bit architectures? And UniPCemu on Linux...

Posted on 2019-02-22, 02:02

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by superfury

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Having improved said mechanisms and error reporting(using the error.log file) with correct formats now, I see it logging the SDL message correctly(when calling SDL_Init): "No available video device". Having compiled the SDL2 code(2.0.9) from source according to the documentation, then fixing the …

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Re: Android NDK fseeko/ftello undefined on 32-bit architectures? And UniPCemu on Linux...

Posted on 2019-02-21, 17:56

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by superfury

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Just added support for SDL_RWops in my 64-bit fopen implementation. Although I've only added it for Linux using SDL2 for the moment, as I can't find out yet if plain SDL supports them as well? Edit: It now replaces fopen, fseek, (ftell is unused and is deferred from fseek and fread/fwrite results), …

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x86 unified segment descriptor write handling docs?

Posted on 2019-02-21, 13:47

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by superfury

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In the same way UniPCemu tries to combine all segment register write logic into one linearly executed function(with specific parts toggled on/off, depending on the type of write), does such a thing exist as documentation as well? Instead of being spread on many different instruction and protection …

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Re: Any good MS-DOS 80386/80486 games for testing Virtual memory support?

Posted on 2019-02-21, 04:30

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by superfury

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Well, the problem in this case is that the PIC isn't reprogrammed correctly it seems, as it receives either an IRQ0 or IRQ8 from interrupt vector 08h, which is the double fault interrupt. When it receives that, it misdiagnoses that to be a double fault?

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Re: Any good MS-DOS 80386/80486 games for testing Virtual memory support?

Posted on 2019-02-20, 19:17

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by superfury

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Having tested in 86Box I can confirm that in that emulator, it (the default exe) loads and runs correctly on a 386DX/40 and a 486DX2/66. Very slow on the 386 though, but that's a different issue. Normal speed on the DX2/66. On a 486SX/33, it gets to the level select screen, and throws a page fault …

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Re: Any good MS-DOS 80386/80486 games for testing Virtual memory support?

Posted on 2019-02-20, 18:57

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by superfury

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interestingly, I see it page faulting on the range of 4XXXXX to around 51XXXX, starting with an address ending in 600(400600?) if I remember correctly. I see that range being page faulted each time I run the ENGINE1 executable(without any other drivers added, no HDPMI32 nor CWSDPMI). 1050-Engine1 …

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Re: Any good MS-DOS 80386/80486 games for testing Virtual memory support?

Posted on 2019-02-20, 18:39

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by superfury

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Perhaps there's a problem with the HDPMI32 executable I'm trying to run it with? Edit: Running no extender before starting it, I see a lot of page faults(which didn't appear when using the HDPMI32 loader) for address 0x400000, but the first time it ends up at a Double Fault. And the second time I …

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Re: Any good MS-DOS 80386/80486 games for testing Virtual memory support?

Posted on 2019-02-20, 18:21

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by superfury

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Do I just add said EMU387.ZIP to the folder? Or do I need to extract those files inside the folder? Edit: Already found the answer inside the documentation inside the ZIP folder. But the program doesn't crash on any FPU opcodes yet? The cause of this is way before that it seems? Edit: Added FPU …

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Re: Any good MS-DOS 80386/80486 games for testing Virtual memory support?

Posted on 2019-02-20, 18:01

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by superfury

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I'll try your four versions, although without FPU emulation it will crash 100% sure(since no FPU is emulated at all). Also note the EIP=C3C CALL immediately after the location that the INC ESP is working on. That seems to somehow be a hint towards what might be going on! Edit: So far, ENGINE has the …

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Re: Any good MS-DOS 80386/80486 games for testing Virtual memory support?

Posted on 2019-02-20, 17:20

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by superfury

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Wow. This is some useful information. You know, I may even pass this along to the FreeBasic people for debugging purposes. This sort of thing happens on real machines as well. If your emulator isn't emulating an FPU, chances are that these errors are the same ones that cause it to fail on a real …

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Re: Any good MS-DOS 80386/80486 games for testing Virtual memory support?

Posted on 2019-02-20, 12:36

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by superfury

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I just tried to run it again with a once-again clean setup(maybe some empty config.sys lines or empty switches). Now running HDPMI32 and then ENGINE I see the double fault being due to opcode E8 causing a stack fault? Edit: Trying it again, I see: 1. A segment write fault #GP(0030), writing segment …

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Re: Any good MS-DOS 80386/80486 games for testing Virtual memory support?

Posted on 2019-02-20, 09:13

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by superfury

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Haha, yes I did notice the walk.raw thing. It’s fixed now but it shouldn’t affect the operation of the engine. TED is the level editor, and is really only guaranteed to run in DOSBox, though theoretically it will also run on a 386. Run ENGINE.EXE for the main program. Ran HDPMI32, then ENGINE. …

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Re: Any good MS-DOS 80386/80486 games for testing Virtual memory support?

Posted on 2019-02-20, 07:25

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by superfury

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Running a boot with minimal configuration(no drivers), running hdpmi32.exe then ted.exe gives me a level prompt. I enter 1 and press enter. Then it says "Loading tiles: page number 1/19" and seems to hang? Edit: It seems to be permanently HLTed, at 0000:000C. EFLAGS=7002. In Real mode.

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Re: Any good MS-DOS 80386/80486 games for testing Virtual memory support?

Posted on 2019-02-20, 07:09

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by superfury

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Did you notice that your SOUND folder has two Walk.raw files(with different extensions, .raw and .RAW), which are counted as one and the same when extracted under Windows/MS-DOS?

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Re: Any good MS-DOS 80386/80486 games for testing Virtual memory support?

Posted on 2019-02-19, 06:42

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by superfury

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One problem: My emulator only fully emulates up to a 80486SX(without FPU). The only thing added so far with the "Pentium(unfinished)" CPU is 4MB page support(this was to try running Minix 3). If it relies on an FPU it won't work(without software emulation of it). One of the reasons Linux 2.0.XX …

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Re: Android NDK fseeko/ftello undefined on 32-bit architectures? And UniPCemu on Linux...

Posted on 2019-02-18, 16:46

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by superfury

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Hmmm.... 64-but file I-O seems to completely fail when build for Linux(defined IS_LINUX and not defined ANDROID): https://bitbucket.org/superfury/commonemuframework/src/master/basicio/fopen64.c Can anybody see what's wrong with said 64-bit file I/O wrapper? Anyone? Edit: Disabling 64-bit file I/O …

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Re: Android NDK fseeko/ftello undefined on 32-bit architectures? And UniPCemu on Linux...

Posted on 2019-02-18, 13:28

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by superfury

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Now, with the latest commits, no more errors and warnings are thrown by the Ubuntu gcc compiler. I also added proper autoconfiguration(configure script), according to the manual at https://thoughtbot.com/blog/the-magic-behind-configure-make-make-install ). Although instead of the usual automake, I …

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