Run-time error in STR instruction

Hi,

Following code:

1:  int main()
2:  {
3:    char Buff[3];
4:    *((short*)(Buff+1)) = 0xFFFF;
5:  }

causes in the 4th string such run-time error:

Non-aligned Access: Thumb Instruction at 00080122H, Memory Access at 000103F9H

Disassembly of the 4th string is:

     4:   *((short*)(Buff+1)) = 0xFFFF;
0x0008011C  4904      LDR       R1,[PC,#0x0010]
0x0008011E  2001      MOV       R0,#0x01
0x00080120  4468      ADD       R0,SP
0x00080122  8001      STRH      R1,[R0,#0x00]

The STRH instruction (address 0x00080122) requires 2-alignment for second operand.
But in this example second operand is not aligned in such manner.

Analogous errors also appear for LDR instruction.

I tested above example with Keil and GNU compilers. Both of them give identical error.

-------------------------------------

With other compilers on other platforms (Borland and I386 for example) such a problem doesn't appear.
It is very convenient to use above method for structures transfer through byte sequence (serial port).
I want to use this method in my work.

How can I use this method on ARM-platform (Keil, GNU compilers)?
How this problem satisfies the ANSI C standart?

Thanks,
Dr. Yuri Tychinsky