On 2016-09-21 12:46 PM, Richard Earnshaw (lists) wrote:
movlt is a conditional instruction matching mov<c> where <c> == lt (less
than). The instruction in cortex-m3 is used by prefixing it with an IT
instruction which modifies the behaviour of subsequent instructions. So
it lt
movlt xxxx
is perfectly legal on this processor.
MOVT is a completely different instruction. It inserts a 16-bit value
in the top half of the destination register, overwriting the previous
bits in that register but leaving the lower half unchanged.
This is all documented in the ARMv7-M version of the ARM ARM
(registration required).
http://infocenter.arm.com/help/topic/com.arm.doc.ddi0403e.b/index.html
R.
I'm not very familiar with conditional instruction matching, so I got
all excited when I thought I found a missing instruction. Sorry. Turns
out I was getting the hard fault because I had not enabled the other
fault handlers. The real fault is from a bus error.....Imprecise data
bus error = "data bus error has occurred, but the return address in the
stack frame is not related to the instruction that caused the error".
Jon
