RT-Thread / RT-Thread/rt-thread
M0没有SCB_VTOR 不能通过此寄存器恢复MSP
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@aozima is already working on this.
Since May 25, 2021.
bug
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Description
rt_hw_context_switch_to 函数 应判断从SCB_VTOR读出来的值，为0不要去修改Msp，否则后面的代码会执行失败
（M0不是所有的core 都有SCB_VTOR的）
; restore MSP
LDR r0, =SCB_VTOR
LDR r0, [r0]
LDR r0, [r0]
MSR msp, r0
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