ARM VERSION 1.2

Writing ARM and Thumb Assembly Language

Single register load and store instructions

These instructions load or store the value of a single low register from or to memory. In

Thumb state they can only access registers r0 to r7.

Multiple register load and store instructions

LDM

and

STM

load from memory and store to me mory any subset of the registers in the

range r0 to r7.

PUSH

and

POP

instructions implement a full descending stack using the stack pointer (r13)

as the base. In addition to transferring r0 to r7,

PUSH

can store the link register and

POP

can load the program c ounter.