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8860 :: Problem compiling ASM code with vars in Mac M1

• wils (orginal) [2022-02-02T00:01:51+01:00] view original

  Hi everyone!

  I'm just setting up my environment to start developing also on my laptop, but I'm facing some problems compiling asm code that has variables on it in Apple silicon processors.

  For example, in this case:

  
  var syscall*  : WORD
  
  proc NtAllocateVirtualMemory(ProcessHandle: HANDLE, BaseAddress: PVOID, ZeroBits: ULONG, RegionSize: PSIZE_T, AllocationType: ULONG, Protect: ULONG): NTSTATUS {.asmNoStackFrame.} =
      asm """
          mov r10, rcx
          mov eax, `syscall`
          syscall
          ret
      """
  Run

  I get the following error when trying to compile with the following flags nim c -d=mingw --app=console --cpu=amd64 HalosGate.nim:

  
  relocation truncated to fit: R_X86_64_32S against `.bss`
  Run

  The error only shows when I am using the special character "`" to include a variable inside asm code, basically when getting the syscall value.

  Full code for debugging can be found in the following GitHub: https://github.com/zimawhit3/HellsGateNim

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• Araq (orginal) [2022-02-02T08:54:03+01:00] view original

  That's x86 assembler and the M1 is ARM.

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• Yardanico (orginal) [2022-02-02T09:13:08+01:00] view original

  I think @wils is trying to cross-compile via mingw, but AFAIK just setting -d:mingw is not always enough to use mingw for cross compilation.

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• Araq (orginal) [2022-02-02T09:32:18+01:00] view original

  Cross compilation is always very limited anyway (exception: embedded targets), setup a CI, then you can also test the resulting binary.

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• wils (orginal) [2022-02-02T09:41:22+01:00] view original

  Yep, I was trying to cross-compile the binary for Windows x64; in a Linux x64 environment (cross-compiling) and a Windows x64 environment I can compile the binary without problems, It only fails when doing it in an M1 processor.

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• mratsim (orginal) [2022-02-02T11:32:59+01:00] view original

  If it's a pain, I have written an inline assembler for Nim that supports advanced patterns:

  Codegen: https://github.com/mratsim/constantine/blob/50717d8/constantine/primitives/macro_assembler_x86.nim

  Example usage: https://github.com/mratsim/constantine/blob/50717d8/constantine/arithmetic/assembly/limbs_asm_x86.nim

  More advanced example in: https://github.com/mratsim/constantine/tree/50717d8/constantine/arithmetic/assembly

  At one point I'll try to create a proper package for it and also support ARM codegen but I certainly don't look forward to documenting GCC/Clang inline assembly syntax.

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