[Qemu-arm] How to get memroy trace in qemu-system-arm or qemu-arm

[Jimmy Situ]

Dear all,

I am trying to capture memory access with qemu-system-arm, and I find there is get_phys_addr in target-arm/helper.c
So
 I add a qemu trace event in it. It seems this trace can capture some 
memroy access. However, the trace address trace doses not make any 
sence.

Do anyone know about this get_phys_addr() function. Does it call by every memory access?
If not, how could I capture the memory trace correctly?

Thanks.