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STMFD sp!,{r0-r12,lr} ;push r0 thru r12 and the link register
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LDMFD sp!,{r0-r12,pc} ;pop r0 thru r12, and the value that was in the link register is put into the program counter.
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;This acts as a pop and return command all-in-one. (Most programs use bx lr to return.)
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