Conversation
Dion Dokter
diondokter@fosstodon.org@jarkko Not sure what you mean...
There are no functions in asm, so no calling conventions for them.
Maybe look at naked function which have recently been stabilized.
1
0
0
@jarkko See this article my colleague Folkert wrote: https://blog.rust-lang.org/2025/07/03/stabilizing-naked-functions/
1
0
0
@diondokter
[I edited the message had to think a bit what I meant.]
OK so, this would stdcall in C:
int __attribute__((__stdcall__)) foo() { asm(" ...
This would be naked stdcall
__attribute__((__naked__)) int __attribute__((__stdcall__)) foo() { asm(" ...
So you're correct saying that in naked version you do what you want but the difference is that you're telling GCC that "I will use stdcall". This makes the function compile equally well in Linux and Windows.
GCC won't create epilogue and prologue for you but it will make the assumptions based on stdcall how you've organized the function from callers perspective. I don't know how to do this in Rust.
[I edited the message had to think a bit what I meant.]
OK so, this would stdcall in C:
int __attribute__((__stdcall__)) foo() { asm(" ...
This would be naked stdcall
__attribute__((__naked__)) int __attribute__((__stdcall__)) foo() { asm(" ...
So you're correct saying that in naked version you do what you want but the difference is that you're telling GCC that "I will use stdcall". This makes the function compile equally well in Linux and Windows.
GCC won't create epilogue and prologue for you but it will make the assumptions based on stdcall how you've organized the function from callers perspective. I don't know how to do this in Rust.
1
0
0
Dion Dokter
diondokter@fosstodon.org@jarkko So you want a normal function with the stdcall abi?
Can't you just do:
```rust
extern "stdcall" fn foo() {
// Whatever... (including inline assembly)
}
```
1
0
0
Jarkko Sakkinen
jarkko
@diondokter I can try this and share the results :-) I have to say that I don't know but I'll test this thanks.
1
0
0
Dion Dokter
diondokter@fosstodon.org@jarkko Ah, I've finally found the list with all the ABIs: https://doc.rust-lang.org/beta/reference/items/external-blocks.html#abi
1
0
1