[Bug 1887854] Re: Spurious Data Abort on qemu-system-aarch64

[K]

Ok, thanks for rooting this out. I could swear that I checked that
address several times and I clearly remember 0x4010ca28, but I don't
remember ever seeing 0x10 ahead of it. I'll dig into it a bit and
hopefully find the root cause in my code.

** Changed in: qemu
       Status: New => Invalid

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Title:
  Spurious Data Abort on qemu-system-aarch64

Status in QEMU:
  Invalid

Bug description:
  When running RTEMS test psxndbm01.exe built for AArch64-ilp32 (this code is 
not yet publically available), the test generates a spurious data abort (the 
MMU and alignment checks should be disabled according to bits 1, 0 of 
SCTLR_EL1). The abort information is as follows:
  Taking exception 4 [Data Abort]
  ...from EL1 to EL1
  ...with ESR 0x25/0x96000010
  ...with FAR 0x104010ca28
  ...with ELR 0x400195d8
  ...to EL1 PC 0x40018200 PSTATE 0x3c5

  The ESR indicates that a synchronous external abort has occurred.
  ESR EC field: 0b100101

  From the ARMv8 technical manual: Data Abort taken without a change in
  Exception level. Used for MMU faults generated by data accesses,
  alignment faults other than those caused by Stack Pointer
  misalignment, and synchronous External aborts, including synchronous
  parity or ECC errors. Not used for debug related exceptions.

  ESR ISS field: 0b10000

  From the ARMv8 technical manual: Synchronous External abort, not on
  translation table walk or hardware update of translation table.

  The following command line is used to invoke qemu:
  qemu-system-aarch64 -machine virt -cpu cortex-a53 -m 256M -no-reboot 
-nographic -serial mon:stdio -kernel 
build/aarch64/a53_ilp32_qemu/testsuites/psxtests/psxndbm01.exe -D qemu.log -d 
in_asm,int,cpu_reset,unimp,guest_errors

  This occurs on Qemu 3.1.0 as distributed via Debian and on Qemu 4.1 as
  built by the RTEMS source builder (4.1+minor patches).

  Edit: This bug can be worked around by getting and setting SCTLR
  without changing its value before each data abort would occur. This
  test needs 6 of these workarounds to operate successfully.

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