Create the file s.c containing the following source code:

long long altstack[10] __attribute__ ((section ("STACK"), zero_init));

int main()
{
    return sizeof(altstack);	
}

Compile the source:

armcc -c s.c -o s.o

Link the object s.o, keeping the STACK symbol and displaying the image memory map:

armlink --keep=s.o(STACK) --map s.o --output=s.axf

Locate the STACK symbol in the output, for example:

...
Execution Region ER_RW (Base: 0x000081c8, Size: 0x00000000, Max: 0xffffffff, ABSOLUTE)

**** No section assigned to this execution region ****


Execution Region ER_ZI (Base: 0x000081c8, Size: 0x000000b0, Max: 0xffffffff, ABSOLUTE)

Base Addr    Size         Type   Attr      Idx    E Section Name        Object

0x000081c8   0x00000060   Zero   RW           42    .bss                libspace.o(c_4.l)
0x00008228   0x00000050   Zero   RW            2    STACK               s.o

This shows that the stack is placed in execution region ER_ZI.