I searched the list of opcodes used in the ARM Cortex M3 / M4 / M4F, with no luck.
There are many [online] links to the 32-bit format of ARM instructions.
Links to Thumb-2 instructions are limited but available .
The version used in the -M variants, however, I cannot find!
The ARM Technical Reference Guide has a โProgrammers Modelโ section that lists instructions, instruction cycles ... but there are no actual codes.
I found the "Ultimate Guide" that has the same problem.
The information should be somewhere there - you need to write a compiler.
Where should I look?
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