ARM Architecture Reference Manual ARMv7-A and ARMv7-R edition

Instruction Details
A8.6.190 STMDA / STMED
Store Multiple Decrement After (Store Multiple Empty Descending) stores multiple registers to consecutive
memory locations using an address from a base register. The consecutive memory locations end at this
address, and the address just below the lowest of those locations can optionally be written back to the base
register.
For details of related system instructions see STM (user registers) on page B6-22.
Encoding A1 ARMv4*, ARMv5T*, ARMv6*, ARMv7
STMDA {!},
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
cond 1 0 0 0 0 0 W 0 Rn register_list
n = UInt(Rn); registers = register_list; wback = (W == ‘1’);
if n == 15 || BitCount(registers) < 1 then UNPREDICTABLE;
A8-376 Copyright © 1996-1998, 2000, 2004-2008 ARM Limited. All rights reserved. ARM DDI 0406B