From: Segher Boessenkool <segher@kernel.crashing.org>
To: Sandipan Das <sandipan@linux.ibm.com>
Cc: mpe@ellerman.id.au, paulus@samba.org,
naveen.n.rao@linux.vnet.ibm.com, linuxppc-dev@lists.ozlabs.org,
anton@samba.org, ravi.bangoria@linux.ibm.com
Subject: Re: [PATCH 1/6] powerpc sstep: Add maddhd, maddhdu, maddld instruction emulation
Date: Tue, 4 Sep 2018 17:12:23 -0500 [thread overview]
Message-ID: <20180904221223.GR24439@gate.crashing.org> (raw)
In-Reply-To: <2962112510464de01b24f9e1014909fde3380d52.1535609090.git.sandipan@linux.ibm.com>
On Mon, Sep 03, 2018 at 08:49:33PM +0530, Sandipan Das wrote:
> +#ifdef __powerpc64__
> + case 4:
> + if (!cpu_has_feature(CPU_FTR_ARCH_300))
> + return -1;
> +
> + switch (instr & 0x3f) {
> + case 48: /* maddhd */
> + asm("maddhd %0,%1,%2,%3" : "=r" (op->val) :
> + "r" (regs->gpr[ra]), "r" (regs->gpr[rb]),
> + "r" (regs->gpr[rc]));
> + goto compute_done;
If running maddhd does not work, will running it in kernel mode work?
I think you should *actually* emulate it.
(Same for the next patch, "darn", but emulation of that is much more
interesting).
Segher
next prev parent reply other threads:[~2018-09-04 22:18 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-09-03 15:19 [PATCH 0/6] powerpc sstep: Extend instruction emulation support Sandipan Das
2018-09-03 15:19 ` [PATCH 1/6] powerpc sstep: Add maddhd, maddhdu, maddld instruction emulation Sandipan Das
2018-09-04 22:12 ` Segher Boessenkool [this message]
2018-09-05 11:30 ` Sandipan Das
2019-02-20 0:51 ` Michael Ellerman
2018-09-03 15:19 ` [PATCH 2/6] powerpc sstep: Add darn " Sandipan Das
2019-02-20 0:50 ` Michael Ellerman
2019-02-20 9:49 ` Sandipan Das
2018-09-03 15:19 ` [PATCH 3/6] powerpc sstep: Add cnttzw, cnttzd " Sandipan Das
2018-09-04 21:12 ` Segher Boessenkool
2018-09-05 6:36 ` Paul Mackerras
2018-09-03 15:19 ` [PATCH 4/6] powerpc sstep: Add extswsli " Sandipan Das
2018-09-03 15:19 ` [PATCH 5/6] powerpc sstep: Add modsw, moduw " Sandipan Das
2018-09-03 15:19 ` [PATCH 6/6] powerpc sstep: Add modsd, modud " Sandipan Das
2018-09-04 21:21 ` Segher Boessenkool
2018-09-05 11:53 ` Sandipan Das
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