Windows: add i386 (windows/386) support #4629

aykevl · 2024-11-26T08:47:35Z

This is not fully working, but very simple programs do work.

The issue I'm currently hitting is that syscall.loadsystemlibrary (defined in src/runtime/runtime_windows.go) appears to be corrupting memory. Or maybe it just overwrites registers, I'm not sure.

See: #3353

github-actions · 2024-11-26T09:04:23Z

Size difference with the dev branch:

Binary size difference

not the same command!
    tinygo build -size short -o ./build/test.hex -target=feather-rp2040 ./examples/adafruit4650
    go: downloading tinygo.org/x/tinyfont v0.3.0
not the same command!
    tinygo build -size short -o ./build/test.hex -target=pico ./examples/tmc5160/main.go
    go: downloading golang.org/x/exp v0.0.0-20241204233417-43b7b7cde48d
not the same command!
    tinygo build -size short -o ./build/test.hex -target=nano-rp2040 -stack-size 8kb ./examples/net/websocket/dial/
    go: downloading golang.org/x/net v0.33.0
not the same command!
    tinygo build -size short -o ./build/test.hex -target=nano-rp2040 -stack-size 8kb ./examples/net/mqttclient/natiu/
    go: downloading github.com/soypat/natiu-mqtt v0.5.1
not the same command!
    tinygo build -size short -o ./build/test.hex -target=wioterminal -stack-size 8kb ./examples/net/mqttclient/paho/
    go: downloading github.com/eclipse/paho.mqtt.golang v1.2.0
 flash                          ram
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  16772   16772      0   0.00%    4180    4180      0   0.00% tinygo build -size short -o ./build/test.hex -target=feather-rp2040 ./examples/adafruit4650
  62240   62240      0   0.00%    6188    6188      0   0.00% tinygo build -size short -o ./build/test.hex -target=itsybitsy-m0 ./examples/adt7410/main.go
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  11780   11780      0   0.00%    4780    4780      0   0.00% tinygo build -size short -o ./build/test.hex -target=circuitplay-express ./examples/lis3dh/main.go
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  67088   67088      0   0.00%    4784    4784      0   0.00% tinygo build -size short -o ./build/test.uf2 -target=pico ./examples/mcp9808/main.go
  30412   30412      0   0.00%    3680    3680      0   0.00% tinygo build -size short -o ./build/test.uf2 -target=pico ./examples/tmc2209/main.go
  13388   13388      0   0.00%    3292    3292      0   0.00% tinygo build -size short -o ./build/test.hex -target=pico ./examples/tmc5160/main.go
  12500   12500      0   0.00%    4552    4552      0   0.00% tinygo build -size short -o ./build/test.uf2 -target=nicenano ./examples/sharpmem/main.go
  61140   61140      0   0.00%    5968    5968      0   0.00% tinygo build -size short -o ./build/test.hex -target=feather-nrf52840 ./examples/max6675/main.go
  87028   87028      0   0.00%    5148    5148      0   0.00% tinygo build -size short -o ./build/test.hex -target=challenger-rp2040 ./examples/net/ntpclient/
 298808  298808      0   0.00%   15908   15908      0   0.00% tinygo build -size short -o ./build/test.hex -target=pyportal -stack-size 8kb ./examples/net/http-get/
 119836  119836      0   0.00%    7848    7848      0   0.00% tinygo build -size short -o ./build/test.hex -target=arduino-nano33 -stack-size 8kb ./examples/net/tcpclient/
 251764  251764      0   0.00%   12868   12868      0   0.00% tinygo build -size short -o ./build/test.hex -target=nano-rp2040 -stack-size 8kb ./examples/net/websocket/dial/
 103420  103420      0   0.00%    9816    9816      0   0.00% tinygo build -size short -o ./build/test.hex -target=metro-m4-airlift -stack-size 8kb ./examples/net/socket/
 339164  339164      0   0.00%   16528   16528      0   0.00% tinygo build -size short -o ./build/test.hex -target=matrixportal-m4 -stack-size 8kb ./examples/net/webstatic/
 111828  111828      0   0.00%    7784    7784      0   0.00% tinygo build -size short -o ./build/test.hex -target=arduino-mkrwifi1010 -stack-size 8kb ./examples/net/tlsclient/
 154632  154632      0   0.00%    6548    6548      0   0.00% tinygo build -size short -o ./build/test.hex -target=nano-rp2040 -stack-size 8kb ./examples/net/mqttclient/natiu/
 116924  116924      0   0.00%   13124   13124      0   0.00% tinygo build -size short -o ./build/test.hex -target=wioterminal -stack-size 8kb ./examples/net/webclient/
 287580  287580      0   0.00%   19572   19572      0   0.00% tinygo build -size short -o ./build/test.hex -target=wioterminal -stack-size 8kb ./examples/net/webserver/
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 118784  118784      0   0.00%    9504    9504      0   0.00% tinygo build -size short -o ./build/test.hex -target=elecrow-rp2040 -stack-size 8kb ./examples/net/tlsclient/
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5741946 5741946      0   0.00%  857610  857610      0   0.00%

aykevl · 2025-03-31T13:47:22Z

Improved the PR slightly: using stdcall on windows/386 so testdata/gc.go works. Importing the time package still crashes the program though.

aykevl · 2025-03-31T14:54:15Z

I think all important things are working now!
The only thing that still fails is this:

$ GOARCH=386 build/tinygo test -v go/format
=== RUN   TestNode
FAIL    go/format       0.726s

...but that's not part of CI (and I'd guess that there are many Linux architectures where some packages don't pass tests).
CI does run some windows/386 tests, so base functionality is being tested.

b0ch3nski · 2025-03-31T21:15:59Z

I think I have some ancient Windows 7 x86 installation around which I could use to test this later this week 🙂

aykevl · 2025-04-01T10:51:06Z

@b0ch3nski
I tested it on an ARM system (actually a Windows VM inside Asahi Linux running on a Macbook). If the X86 emulation in Windows is good, this should show that it's working as intended. But testing on a real x86 (or even amd64) system would confirm that, so if you want to test that would be great!

BieHDC · 2025-04-01T18:19:28Z

@aykevl Thanks for your work!
For simple testing i just compiled src/examples/test and ran it. GOOS=windows GOARCH=386 ./build/tinygo build -o src/examples/test/test.exe src/examples/test/test.go
It works on Windows 11 64Bit and Windows Vista 32Bit as they ship new enough dlls and accept the default PE version.
It does not work on Windows XP and lower due to PE version and the dependent dlls. See my previous work on how i fixed that.

My goal with the 32Bit version was explicitly for the older Windows Versions. Is that also in your interest? The 32/64Bit sliding line for Windows is between XP with 32Bit and 7 with 64Bit, which all are unsupported by now and do not require or benefit from the more secure APIs used right now.

A side question: is there a testsuite we can compile into a binary for extensive testing beyond a print?

BieHDC · 2025-04-01T18:21:54Z

compiler/symbol.go

@@ -208,6 +208,12 @@ func (c *compilerContext) getFunction(fn *ssa.Function) (llvm.Type, llvm.Value)
 			// > circumstances, and should not be exposed to source languages.
 			llvmutil.AppendToGlobal(c.mod, "llvm.compiler.used", llvmFn)
 		}
+	case "GetModuleHandleExA", "GetProcAddress", "GetSystemInfo", "GetSystemTimeAsFileTime", "LoadLibraryExW", "QueryUnbiasedInterruptTime", "SetEnvironmentVariableA", "Sleep", "VirtualAlloc":


Can this be done as a catch-all when a kernel32.dll function is being imported?
Also this fixup might be required for all external dll calls in general. Would need more testing.

I suppose it can, by parsing //sys comments in the source code. But just adding the list of names was a lot easier.

Programs that would like to call kernel32.dll functions should use the syscall package, which uses the appropriate calling convention.

b0ch3nski · 2025-04-06T13:08:25Z

I can also confirm that this indeed works on Windows 7 x86 🎉

And I agree with @BieHDC - if it could be made working also for Windows XP only by tweaking ldflags, let's go for it. I can think of some nostalgia projects running modern software on XP 😄

BieHDC · 2025-04-06T16:51:59Z

And I agree with @BieHDC - if it could be made working also for Windows XP only by tweaking ldflags, let's go for it. I can think of some nostalgia projects running modern software on XP 😄

That is also my idea. Would be cool to code stuff for old Windows in Go just for the heck of it.
I personally would go as low as Windows 98, but my ultimate goal would be 95. It depends on OP how low this PR goes. But if OP stays above and this gets merged before christmas, then i know what i will do in the next holidays.

aykevl · 2025-04-07T15:20:02Z

It does not work on Windows XP and lower due to PE version and the dependent dlls. See my previous work on how i fixed that.

It looks like there's a version of UCRT for Windows XP. Perhaps that would work?
https://learn.microsoft.com/en-us/cpp/windows/universal-crt-deployment?view=msvc-170#deployment-on-microsoft-windows-xp

I tried using MSVCRT.DLL but didn't get it to run (though binaries do compile). Here is how far I got: dev...windows-386-msvcrt
You could try running such a binary in WinDbg to see why it crashes.

My proposal would be to merge this PR and then develop based on that for those who would like to support even older Windows versions.

My goal with the 32Bit version was explicitly for the older Windows Versions. Is that also in your interest?

I was working on it because there was demand for it (see #3353). I don't use Windows nor X86 so it was purely out of interest to see whether it could work.

A side question: is there a testsuite we can compile into a binary for extensive testing beyond a print?

You can run GOARCH=386 make tinygo-test-fast, which runs most supported standard library tests. Or you can compile individula packages using tinygo build -c packagename and then run the resulting packagename.test.exe on the target system. There is no single binary that runs all tests.

aykevl · 2025-04-07T16:20:50Z

Actually I managed to create very simple programs that run with msvcrt.dll, and updated my branch: dev...windows-386-msvcrt

Feel free to use this code for Windows XP support. (Older Windows versions are likely going to be difficult because they aren't really supported by anything anymore, even Windows XP is barely working because it's so old).

aykevl · 2025-04-08T11:16:40Z

Updated to use MSVCRT.DLL on GOARCH=386. This might allow binaries to run on Windows XP, but I haven't tested that.

aykevl · 2025-04-08T13:35:05Z

Sadly, it looks like it doesn't quite work yet on Windows XP (this is with --major-os-version 4 added to the linker). Unfortunately the error message isn't very helpful either.

(Why did I put the test file in an ISO? Because I couldn't get networking to work at all, and apparently file sharing is difficult on Windows XP so I didn't even try).

I don't think I'll be experimenting with this further, but anybody wanting to dig deeper is free to try :)

Anyway, this PR is ready from my POV.

aykevl · 2025-04-09T09:00:10Z

I actually got it to work!

b0ch3nski · 2025-04-09T09:32:59Z

compileopts/config.go

+		} else {
+			cflags = append(cflags,
+				"-D_UCRT",
+				"-D_WIN32_WINNT=0x0a00", // target Windows 10


What consequences we would have with 0x0601 targeting Windows 7 here on x64 architecture?

Honestly I don't know. It probably works just fine (and if it doesn't we can change that). Note that it didn't change: "-D_WIN32_WINNT=0x0a00" was already there, so this doesn't modify behavior for modern (amd64/arm64) systems.

BieHDC · 2025-04-11T14:00:13Z

(Why did I put the test file in an ISO? Because I couldn't get networking to work at all, and apparently file sharing is difficult on Windows XP so I didn't even try).

I am doing the exact same thing and it is the easiest way for one way transferring.

And nice to see you went down to XP, thanks!

b0ch3nski · 2025-04-21T13:58:46Z

@aykevl Could you please resolve merge conflicts? Apart from it, I think that it's good to go 🙂

This allows the binaries to run on Windows XP, without needing any extra DLLs. Tested in an x86 Windows XP SP3 virtual machine.

aykevl · 2025-04-21T15:55:50Z

Rebased!

deadprogram · 2025-04-22T15:45:25Z

@aykevl thanks for working on this retro feature. Also thanks @b0ch3nski and @BieHDC for all the reviewing.

Now merging.

aykevl mentioned this pull request Nov 26, 2024

Windows 386 build support #3353

Open

aykevl marked this pull request as draft November 26, 2024 09:21

aykevl marked this pull request as ready for review November 26, 2024 09:22

aykevl changed the title ~~Windows: add i386 (windows/386) support~~ WIP Windows: add i386 (windows/386) support Nov 26, 2024

aykevl changed the title ~~WIP Windows: add i386 (windows/386) support~~ [WIP] Windows: add i386 (windows/386) support Nov 26, 2024

aykevl force-pushed the windows-386 branch 2 times, most recently from 33ab8b2 to 38bdbe9 Compare March 31, 2025 13:33

aykevl force-pushed the windows-386 branch from 38bdbe9 to e95d56f Compare March 31, 2025 14:52

BieHDC reviewed Apr 1, 2025

View reviewed changes

aykevl force-pushed the windows-386 branch from e95d56f to bb2bfe5 Compare April 8, 2025 10:37

aykevl changed the title ~~[WIP] Windows: add i386 (windows/386) support~~ Windows: add i386 (windows/386) support Apr 8, 2025

aykevl force-pushed the windows-386 branch 3 times, most recently from 0e9322d to 5ec0654 Compare April 8, 2025 11:41

aykevl force-pushed the windows-386 branch from 5ec0654 to f1d1c59 Compare April 9, 2025 08:58

b0ch3nski reviewed Apr 9, 2025

View reviewed changes

aykevl added 2 commits April 21, 2025 17:54

windows: add windows/386 support

17400cc

windows: use MSVCRT.DLL instead of UCRT on i386

13d6eeb

This allows the binaries to run on Windows XP, without needing any extra DLLs. Tested in an x86 Windows XP SP3 virtual machine.

aykevl force-pushed the windows-386 branch from f1d1c59 to 13d6eeb Compare April 21, 2025 15:55

deadprogram merged commit aa63f26 into dev Apr 22, 2025
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deadprogram deleted the windows-386 branch April 22, 2025 15:45

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