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Re: [Qemu-devel] [PATCH v4 0/7] tcg/ppc: Add vector opcodes
From: |
Mark Cave-Ayland |
Subject: |
Re: [Qemu-devel] [PATCH v4 0/7] tcg/ppc: Add vector opcodes |
Date: |
Sat, 22 Jun 2019 16:01:59 +0100 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.7.1 |
On 22/06/2019 15:20, Mark Cave-Ayland wrote:
> I've just given your tcg-ppc-vsx branch a spin here, and like Howard I'm
> getting
> segfaults trying to launch my MacOS images :( The segfault is weird: it
> doesn't get
> caught by an attached gdb and the qemu-system-ppc process seems to hang
> around like a
> zombie which makes me think that it's probably an illegal instruction of some
> kind,
> but the PPC kernel can't handle it as well as x86 does.
>
> With a bit more work I bisected it down to the first commit in the patchset
> (d8dcbb57e9: "tcg/ppc: Initial backend support for Altivec") and then as an
> experiment I hacked tcg_can_emit_vec_op() to always return 0 to see if that
> made a
> difference, but the segfault still appears.
>
> The commit message mentions that the load and store helpers are also
> improved, so I
> wonder if they are what is causing the error rather than the vector parts?
> Also in
> the kernel log I see the following messages appearing:
>
> [3639669.374942] qemu-system-ppc[28591]: segfault (11) at 64b8 nip f87280 lr
> f8723c
> code 1 in qemu-system-ppc[94e000+aa0000]
> [3639669.380015] qemu-system-ppc[28591]: code: 93c10038 91810020 90010044
> 7fc802a6
> 3fde0059 2e030000 3bde6c18 7c9d2378
> [3639669.385056] qemu-system-ppc[28591]: code: 813e80a0 7cbb2b78 7cda3378
> 7cf93b78
> <81428ff8> 9141001c 39400000 81290000
>
> Does that help at all? If not let me know if there are any other tests that
> you'd
> like me to try to help debug this.
One more hint: if I try a build of d8dcbb57e9 along with my
tcg_can_emit_vec_op()
hack and pass --enable-debug-tcg to configure then I get an assert on startup:
qemu-system-ppc: /home/mca/src/qemu/tcg/tcg.c:2207: process_op_defs: Assertion
`tdefs
!= ((void *)0)' failed.
Aborted
ATB,
Mark.
- Re: [Qemu-devel] [PATCH v4 0/7] tcg/ppc: Add vector opcodes, Richard Henderson, 2019/06/18
- Re: [Qemu-devel] [PATCH v4 0/7] tcg/ppc: Add vector opcodes, Mark Cave-Ayland, 2019/06/19
- Re: [Qemu-devel] [PATCH v4 0/7] tcg/ppc: Add vector opcodes, Howard Spoelstra, 2019/06/20
- Re: [Qemu-devel] [PATCH v4 0/7] tcg/ppc: Add vector opcodes, Mark Cave-Ayland, 2019/06/22
- Re: [Qemu-devel] [PATCH v4 0/7] tcg/ppc: Add vector opcodes,
Mark Cave-Ayland <=
- Re: [Qemu-devel] [PATCH v4 0/7] tcg/ppc: Add vector opcodes, Aleksandar Markovic, 2019/06/23
- Re: [Qemu-devel] [PATCH v4 0/7] tcg/ppc: Add vector opcodes, Richard Henderson, 2019/06/25
- Re: [Qemu-devel] [PATCH v4 0/7] tcg/ppc: Add vector opcodes, Mark Cave-Ayland, 2019/06/25
- Re: [Qemu-devel] [PATCH v4 0/7] tcg/ppc: Add vector opcodes, Richard Henderson, 2019/06/25
- Re: [Qemu-devel] [PATCH v4 0/7] tcg/ppc: Add vector opcodes, Mark Cave-Ayland, 2019/06/25
- Re: [Qemu-devel] [PATCH v4 0/7] tcg/ppc: Add vector opcodes, Richard Henderson, 2019/06/26
- Re: [Qemu-devel] [PATCH v4 0/7] tcg/ppc: Add vector opcodes, Mark Cave-Ayland, 2019/06/26
- Re: [Qemu-devel] [PATCH v4 0/7] tcg/ppc: Add vector opcodes, BALATON Zoltan, 2019/06/26
- Re: [Qemu-devel] [PATCH v4 0/7] tcg/ppc: Add vector opcodes, Richard Henderson, 2019/06/26
- Re: [Qemu-devel] [PATCH v4 0/7] tcg/ppc: Add vector opcodes, Mark Cave-Ayland, 2019/06/26