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ARMv8 trigger core dump

Pete_Gil

Hi,

We need to trigger a dump via the use of ARMV8 instructions but we have not found a reliable way of doing this. We have tried the following:

  • set the PSTATE flags via MSR DAIFClr, #0b1111
  • Instigate an Illegal Vector Table Fetch

    • // Relocate vector table to illegal address
      ldr x3, 0xE000ED00
      mov x2, #0x1000000
      str x2, [x3, #8]

      // Trigger PendSV exception to read invalid vector
      ldr x3, 0xE000ED00
      mov x2, 0x10000000
      str x2, [x3, #4]
      isb
      nop
      dsb sy
      nop

This is after stopping all cores and then restarting them after issuing these instructions.

Question is, is there a better way to force a dump?

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  • 0 in reply to Jerry Little

    Hi,

    This approach appears to cause an immediate dump sometimes, other times it will hang which is not what we need since our Hard lockup detector then kicks in. Is there a way to force an immediate dump or to put it another way, what could be causing this delay in dumping using the SVC/HVC instruction?