ARM VERSION 1.2 manual POP reglist, pc, These instructions do not affect the flags

Thumb Instruction Reference

POP {reglist, pc}

This instruction causes a branch to the address popped off the stack into the pc. This is usually a return from a subroutine, where the lr was pushed onto the stack at the start of the subroutine.

In ARM architecture version 5T and above:

•if bits[1:0] of the value loaded to the pc are b00, the processor changes to ARM state

•bits[1:0] must not have the value b10.

In ARM architecture version 4T and earlier, bits[1:0] of the value loaded to the pc are ignored, so POP cannot be used to change state.

Condition flags

These instructions do not affect the flags.

Architectures

These instructions are available in all T variants of the ARM architecture.

Examples

PUSH	{r0,r3,r5}
PUSH	{r1,r4-r7}	;	pushes r1, r4,	r5, r6, and r7
PUSH	{r0,LR}
POP	{r2,r5}
POP	{r0-r7,pc}	;	pop and return	from subroutine

Incorrect examples

PUSH	{r3,r5-r8}	; high		registers			not allowed
PUSH	{}	; must		be at		least one register in list
PUSH	{r1-r4,pc}	;	cannot		push the pc
POP	{r1-r4,LR}	;	cannot		pop	the	LR

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