[SOLVED] Strange AV in asm proc

[guest58172]

Code: Pascal  [Select][+][-]

1. program Project1;
2.  
3. {$Mode objfpc}
4. {$AsmMode intel}
5.  
6. type TProc = function(): PtrInt;
7.  
8. function AllInOne(): PtrInt; assembler;
9. asm
10.   mov rax, 1 // 9 bytes
11.   ret        // 1
12.   nop        // + 6
13.   nop
14.   nop
15.   nop
16.   nop
17.   nop
18.   mov rax, 2 // this EIP is then aligned to 8...
19.   ret
20. end;
21.  
22. var
23.   proc1, proc2: TProc;
24.  
25. begin
26.   proc1 := @AllInOne;
27.   proc2 := TProc(pointer(proc1) + 16);
28.   writeln(proc1());
29.   writeln(proc2());
30. end.

The call to proc2 is okay but not the one to proc1. The idea is to generate the code for several function in one and then to play with code offsets. There no temporaries, no stack frame... why does this AV occurs then ?

[marcov]

Check the assembler generated? I don't see a nostackframe modifier.

[guest58172]

Aw yeah it works with the`nostackframe;` attribute. I thought there was no stack frame because the prologue and the epilogue were not generated.