E200与M4指令和编程模型对比

Programming mo E200 GPR32个

SPR35个

Exception (type and cause)Reset

asynchronous(AS),imprecise(IP) , by reset input CriticalInterrupt

AS,IP,maskable(M),critical(C), by critint input

MachineCheck

C, by mcp and nmi input DataStorage

synchronous(S),precise(P),non-critical(NC), by d_tea input InstructionStorage

S,P,NC, by i_tea input

N/A

Program

S, P, NC, by illegal and trap instructions

SysCall

S, P, NC, by se_sc instruction Alignment

S, P, NC, by unaligned

lmw,stmw,lwarx or stwcx. Instructions

N/A

Debug

P/IP, by software debug events N/A

ExternalInterrupt

AS, IP, M, NC, by extint input Debug events target instruction address comes

target data address comes

trap instruction comes and valid

branch taken happens

current instruction completed

interrupt taken happens

se_rfi or se_rfci instruction comes

unconditional debug event

by p_ude input

Debug functionshalt

single step

register access

N/A

software breakpoint

N/A

M4匹配结果

16个,R13=stack pointer,R14=link reg,R15=PC 个数不同,功能基本相同7个个数和功能不同Reset asynchronous(AS),imprecise(IP),Priority=-3(C=-3), by reset input 基本相同NoneMaskableInterrupt AS, C=-2, by external interrupt input 基本相同HardFault,

C=-1, by other system error 部分相同需要拆分

需要拆分

MemManage

S, C=configurable(CF), by MPU protection fault UsageFault

S, C=CF, illegal instruction, divide zero 部分相同

SVCall

S,C=CF, by SVC instruction 基本相同N/A

无对应

PendSV

AS,C=CF, by interrupt driven request for system level service N/A

无对应

SysTick

AS,C=CF, by system timer

BusFault

S,P, C=CF, by i/d_tea input

Interrupt

基本相同AS,C=CF, by external interrupt input

机制不同

halt基本相同single step部分相同register access部分相同vector catch无对应unlimited software breakpoint部分相同system memory access无对应

mapping难度低

中

低

低

中

中

中

中

低

高

高

低

高低中中高中高