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ARM DDI 0337B
Base register update in LDM and STM operations
There are cases in which an LDM or STM updates the base register:
•
When the instruction specifies base register write-back, the base register changes
to the updated address. An abort restores the original base value.
•
When the base register is in the register list of an LDM, and is not the last register
in the list, the base register changes to the loaded value.
An LDM/STM is restarted rather than continued if:
•
the LDM/STM faults
•
the LDM/STM is inside an IT.
If an LDM has completed a base load, it is continued from before the base load.
Saved x PSR bits
On entering an exception, the processor saves the combined information from the three
status registers on the stack.
Copyright © 2005, 2006 ARM Limited. All rights reserved.
Programmer's Model
2-9
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