How to assign the specific SRAM area to use a specific purpose

Question

I want to assign the SRAM start address to use a specific purpose like the following.

#define STATUS_TASK1 (*(volatile unsigned char *)(0x12000000))
#define STATUS_TASK2 (*(volatile unsigned char *)(0x12000001))

But after compiling and linking, this area is assigned to variables.

motor1_flag                             0x12000000   Data           3  main.o(.data)
led_status                              0x12000003   Data           1  main.o(.data)

How can I assign the SRAM(0x12000000 ~ 0x12000001) to use a specific purpose(using KEIL)?

Thanks