ARM inline Assembly or pure Assembly in Keil

How can I write inline ARM Assembly functions or pure Assembly in Keil for STM32F429 microcontroller?

I have some unsuccessful attempts:

For pure Assembly:

AREA     ARMex, CODE, READONLY
                                ; Name this block of code ARMex
        ENTRY                   ; Mark first instruction to execute
start
        MOV      r0, #0x10       ; Set up parameters
        MOV      r1, #3
        ADD      r0, r0, r1     ; r0 = r0 + r1
stop
        MOV      r0, #0x18      ; angel_SWIreason_ReportException
        LDR      r1, =0x20026   ; ADP_Stopped_ApplicationExit
        SVC      #0x12      ; ARM semihosting (formerly SWI)
        END                     ; Mark end of file

I get error message for every each line in which I use # to write constant. I tried #10 #0x10 Error message: "new.s(9): error: A1859E: Flag preserving form of this instruction not available" If I don't write # then thas is problem, too.

For inline Assembly:
I get error message when I use registers. It revognises the reigsters as a normal variable.

I found in Keil: Use GCC (Project->Manage->Components,Environment,Books->Folders/Extensions) I choose Use GCC, I give a right path and a right prefix but it does not work, I get error message: "Failed to execute arm-none-eabias'
I tryed this, because I use EmBmocks too with GCC compiler and the inline arm assembly works well there. But I need to know how I should use it in Keil.
The inline Assembly in Emblocks with GCC compiler:

asm(
     "eor    r2, r2 ;"
     "mov    r3, #2 ;"
      );