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[Bug 811683] Re: 7400, 7410, 7450 cpus vector have wrong exception prefi
From: |
Thomas Huth |
Subject: |
[Bug 811683] Re: 7400, 7410, 7450 cpus vector have wrong exception prefix at reset |
Date: |
Mon, 03 May 2021 09:29:05 -0000 |
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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