[Bug 1924669] Re: VFP code cannot see CPACR write in the same TB

[Hansni Bu]

Sorry, it's because a "ISB" is missing after CPACR is changed. Not bug
of qemu.

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

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https://bugs.launchpad.net/bugs/1924669

Title:
  VFP code cannot see CPACR write in the same TB

Status in QEMU:
  Invalid

Bug description:
  If FPU is enabled by writing to CPACR, and the code is in the same
  translation block as the following VFP code, qemu generates "v7M NOCP
  UsageFault".

  This can be reproduced with git HEAD (commit
  8fe9f1f891eff4e37f82622b7480ee748bf4af74).

  The target binary is attached. The qemu command is:
  qemu-system-arm -nographic -monitor null -serial null -semihosting -machine 
mps2-an505 -cpu cortex-m33 -kernel cpacr_vfp.elf -d 
in_asm,int,exec,cpu,cpu_reset,unimp,guest_errors,nochain -D log

  If the code is changed a little, so that they are not in the same
  block, VFP code can see the effect of CPACR, or -singlestep of qemu
  has the same result.

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