ARM/Instruction format
From Rice Wiki
< ARM
The ARM instruction format is split into three types of instructions:
This page will go through the instruction format of each type.
Data-processing instruction format
Data-processing instructions take in the following operands
- Rn: the first source register
- Src2: the second source, which may be register or immediate
- Rd: destination register
and the following is used to control the instruction
- cond: specifies conditional execution
- op: the opcode, which is 0b00 for data processing instructions
- funct: the function to perform
Src2
Allows for immediate (a constant with rotation), register (with a static shift amount), or register-shifted register.
The immediate is rotated imm8 ROR rot*2, limiting precision but allowing for a greater range of values.
