uCOSII移植到CortexM0上遇到的问题
各位前辈好，我按照uCOSII移植到CortexM3的步骤，将uCOSII移植到CortexM0上，发现OS_CPU_A.ASM 中的个别指令M0不支持，比如CBZ，如何用M0自己的指令替代这些呢，谢谢指导！
无法辨认的指令有：
CBZ R0, OS_CPU_PendSVHandler_nosave ; Skip register save the first time
STM R0, {R4-R11}
POP {R14} ;此处编译器提示应该用R0到R7
LDM R0, {R4-R11} ; Restore r4-11 from new process stack
ORR LR, LR, #0x04 ; Ensure exception return uses process stack
RSEG .text:CODE:NOROOT(2)
THUMB
PendSV_Handler
CPSID I ; Prevent interruption during context switch
MRS R0, PSP ; PSP is process stack pointer
CMP R0, #0
BEQ __nosave_regs ; equivalent code to CBZ from M3 arch to M0 arch
; Except that it does not change the condition code flags
SUBS R0, R0, #0x20 ; Save remaining regs r4-r11 on process stack
LDR R1, =OSTCBCur ; OSTCBCur->OSTCBStkPtr = SP;
LDR R1,
STR R0, ; R0 is SP of process being switched out
STM R0!, {R4-R7} ; Store R4-R7(Low Registers) on process stack
MOV R4, R8 ; Move R8-R11 values to R4-R7 registers.
MOV R5, R9
MOV R6, R10
MOV R7, R11
STM R0!, {R4-R7} ; Store R8-R11(High Registers) on process stack
; At this point, entire context of process has been saved
__nosave_regs
LDR R0, =OSPrioCur ; OSPrioCur = OSPrioHighRdy;
LDR R1, =OSPrioHighRdy
LDRB R2,
STRB R2,
LDR R0, =OSTCBCur ; OSTCBCur= OSTCBHighRdy;
LDR R1, =OSTCBHighRdy
LDR R2,
STR R2,
LDR R0, ; R0 is new process SP; SP = OSTCBHighRdy->OSTCBStkPtr;
ADDS R0, #0x10 ; Adjust SP to High Registers(R8-R11) location
LDM R0!, {R4-R7} ; Load R8-R11 values from new process stack into R4-R7
MOV R8,R4 ; Restore R8-R11 by moving their values from R4-R7
MOV R9,R5
MOV R10, R6
MOV R11, R7
MSR PSP, R0 ; Load PSP with new process SP
SUBS R0, R0, #0x20 ; Adjust SP to Low registers(R4-R7) location
LDM R0!, {R4-R7} ; Restore remaining R4-R7 from new process stack
MOV R0,R14
MOVS R1,#0x04 ; Immediate move to register
ORRS R0,R1 ; Ensure exception return uses process stack
MOV R14, R0
CPSIE I
BX LR ; Exception return will restore remaining context 遇到楼主同样问题，谢谢楼上解答。
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