[Qemu-devel] [Bug 1724485] [NEW] Invalid assertion in arm_read_memory_func

[Christophe Lyon]

Public bug reported:

Hi,

I think there is an invalid assertion in arm_read_memory_func:
assert(info->endian == BFD_ENDIAN_LITTLE)

I face it in the following use case: target armeb-linux (I use qemu user
mode), -d in_asm -cpu any.

At some point during program startup, glibc's _dl_new_object calls
strlen, which is written in thumb2 mode (armv6t2). So print_insn_arm()
calls arm_read_memory_func() with length==2, and info->flags ==
INSN_ARM_BE32, and the assert is false.

If I remove the assert, execution continues OK.

With the assert, I get the error message from the assert, and qemu then
stalls.

Can you confirm the assert can be removed? Or if not, explain me how to
avoid/fix the subsequent qemu stall?

Thanks

** Affects: qemu
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1724485

Title:
  Invalid assertion in arm_read_memory_func

Status in QEMU:
  New

Bug description:
  Hi,

  I think there is an invalid assertion in arm_read_memory_func:
  assert(info->endian == BFD_ENDIAN_LITTLE)

  I face it in the following use case: target armeb-linux (I use qemu
  user mode), -d in_asm -cpu any.

  At some point during program startup, glibc's _dl_new_object calls
  strlen, which is written in thumb2 mode (armv6t2). So print_insn_arm()
  calls arm_read_memory_func() with length==2, and info->flags ==
  INSN_ARM_BE32, and the assert is false.

  If I remove the assert, execution continues OK.

  With the assert, I get the error message from the assert, and qemu
  then stalls.

  Can you confirm the assert can be removed? Or if not, explain me how
  to avoid/fix the subsequent qemu stall?

  Thanks

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