IA-32 Architecture
IA is the abbreviation of Intel Architecture
- 8 GPR (General Purpose Register, general purpose register)
a flag register EFLAGs
PC is the EIP register, which stores the instruction address - Addressable space 4GB
- The instruction format becomes longer and the opcode becomes longer
Information to be given in the command:
Operation nature (opcode)
source operand 1 or/and source operand 2 (immediate value, register number, storage address)
destination operand address (register number, storage address)
The description of the storage address is related to the data structure of the operand!
IA-32 register organization
- flag register
•6个条件标志
–OF、SF、ZF、CF各是什么标志（条件码）
–AF：辅助进位标志（BCD码运算时才有意义）
–PF：奇偶标志
•3个控制标志
–DF（Direction Flag）：方向标志（自动变址方向是增还是减）
–IF（Interrupt Flag）：中断允许标志 （仅对外部可屏蔽中断有用）
–TF（Trap Flag）：陷阱标志（是否是单步跟踪状态）
IA-32 addressing mode
Six 16-bit segment registers get segment base address
- Addressing Modes in Protected Mode
IA-32 machine instruction format
Reference: NTU Computer System Fundamentals (1)