PC寄存器的真实状态

因为预取指令的关系，PC寄存器永远比当前的寄存器多两个指令，ARM模式为大8，Thumb模式为大2，这针对的是32bit的ARMv7的指令集

In ARM state, the value of the PC is the address of the current instruction plus 8 bytes.

In Thumb state:

For B, BL, CBNZ, and CBZ instructions, the value of the PC is the address of the current instruction plus 4 bytes.
For all other instructions that use labels, the value of the PC is the address of the current instruction plus 4 bytes, with bit[1] of the result cleared to 0 to make it word-aligned.

X86是加4