Program can't exit from the exeception

[l ck]

Hi everyone, when I tried to run a exeception demo in netduino2, it can't exit from the exeception, in which after executing the assembly instruction `br lr`, it can't return back to the normal execution. This is the content after I executed `qemu-system-arm -M netduino2 -kernel demo.elf -d int` in terminal:

 

```shell

Loaded reset SP 0x0 PC 0x0 from vector table

Loaded reset SP 0x20001000 PC 0x12b from vector table

Taking exception 5 [IRQ] on CPU 0

...taking pending nonsecure exception 53

...loading from element 53 of non-secure vector table at 0xd4

...loaded new PC 0x1c1

Taking exception 8 [QEMU v7M exception exit] on CPU 0

Exception return: magic PC fffffff9 previous exception 53

...tailchaining to pending exception

...taking pending nonsecure exception 53

...loading from element 53 of non-secure vector table at 0xd4

...loaded new PC 0x1c1

Taking exception 8 [QEMU v7M exception exit] on CPU 0

Exception return: magic PC fffffff9 previous exception 53

...tailchaining to pending exception

...taking pending nonsecure exception 53

...loading from element 53 of non-secure vector table at 0xd4

...loaded new PC 0x1c1

```

 

I wrote the demo based on those two commits

 

[https://github.com/hac425xxx/qemu-fuzzing/commit/609538e1407de884f6c9e4d](https://github.com/hac425xxx/qemu-fuzzing/commit/609538e1407de884f6c9e4d)

 

[https://github.com/hac425xxx/qemu-fuzzing/commit/7bc0e0aa35363c18fcf5b89d](https://github.com/hac425xxx/qemu-fuzzing/commit/7bc0e0aa35363c18fcf5b89d)

 

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