[Bug 811683] Re: 7400, 7410, 7450 cpus vector have wrong exception prefix at reset

[Thomas Huth]

This is an automated cleanup. This bug report has been moved to QEMU's
new bug tracker on gitlab.com and thus gets marked as 'expired' now.
Please continue with the discussion here:

 https://gitlab.com/qemu-project/qemu/-/issues/85


** Changed in: qemu
       Status: Triaged => Expired

** Bug watch added: gitlab.com/qemu-project/qemu/-/issues #85
   https://gitlab.com/qemu-project/qemu/-/issues/85

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https://bugs.launchpad.net/bugs/811683

Title:
  7400,7410,7450 cpus vector have wrong exception prefix at reset

Status in QEMU:
  Expired

Bug description:
  I have a proprietary ROM implementing system calls that are executed
  via the 'SC' instruction.

  I use qemu-0.14.1,

  qemu-system-ppc -M prep -cpu $CPU -bios my_bios -kernel my_kernel

  That works fine on a 604 (CPU=0x00040103) - but does not on an emulated 7400 
(CPU=0x000c0209) or 7450 (CPU=0x80000201). I found that the emulator jumps to 
0x00000c00 instead of 0xfff00c00.
  Probably this is due to a wrong setting in target-ppc/translate_init.c:

  init_excp_604() correctly sets env->hreset_vector=0xfff00000UL;

  but

  init_excp_7400() says env->hreset_vector=0x00000000UL;

  which seems wrong. (the 7400 manual says a hard-reset jumps initializes the
  prefix to 0xfff00000.)

  Likewise, init_excp_7450() (and probably other, related CPUs) are
  wrong.

  Indeed, when I change the value in init_excp_7400() to 0xfff00000UL then
  everything works as expected for me.

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