Question

assume that a full-ascending (fa) stack is in use, appropriate stack space is already allocated to the stack, and the stack pointer is appropriately initialized. write only one arm assembly instruction (at location return) to return from the function fun1 to the main program using a ldmxx instruction with ia, ib, da, or db notation and to correctly update the stack pointer (do not forget to include all operands). main . . . . . . . . call bl fun1 . . . . . . . . fun1 str r1,[sp,

Answer 1

The arm assembly instruction that can be used to return from the function fun1 to the main program and update the stack pointer is 'ldmia sp!,{pc}'.

Step-by-step explanation:

The arm assembly instruction that can be used to return from the function fun1 to the main program and update the stack pointer is:

ldmia sp!,{pc}

This instruction will use the Load Multiple Increment After (LDMIA) instruction with the stack pointer sp and Program Counter (PC) as the registers. The ! indicates that the stack pointer should be incremented after the instruction is executed.