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

Assembler syntax
SBFX , , #, #
where:
See Standard assembler syntax fields on page A8-7.
The destination register.
The first operand register.
Instruction Details
is the bit number of the least significant bit in the bitfield, in the range 0-31. This determines
the required value of lsbit.
is the width of the bitfield, in the range 1 to 32-. The required value of widthminus1 is
-1.
Operation
if ConditionPassed() then
EncodingSpecificOperations();
msbit = lsbit + widthminus1;
if msbit