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PD#SWPL-4718 Problem: Will have "PC=0, LR=0" issue when try to show active cpu stacks via sysrq Solution: Save the addr of current interrupted task's context to the interrupt stack first, so that we can easily obtain pt_regs later Verify: Locally on Ampere Change-Id: I1cc5095e0ec356bed90f76cdf9af1b2617ce7834 Signed-off-by: Jiamin Ma <jiamin.ma@amlogic.com>