linux-kernel - Re: [V6,1/9] elf: Add new powerpc specifc core note sections

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Message-Id: <20141203052204.9DA8F1400DD@ozlabs.org>
Date:	Wed,  3 Dec 2014 16:22:04 +1100 (AEDT)
From:	Michael Ellerman <mpe@...erman.id.au>
To:	Anshuman Khandual <khandual@...ux.vnet.ibm.com>,
	linux-kernel@...r.kernel.org, linuxppc-dev@...abs.org
Cc:	shuahkh@....samsung.com, mikey@...ling.org, james.hogan@...tec.com,
	avagin@...nvz.org, Paul.Clothier@...tec.com, peterz@...radead.org,
	palves@...hat.com, oleg@...hat.com, davem@...emloft.net,
	dhowells@...hat.com, kirjanov@...il.com, davej@...hat.com,
	akpm@...ux-foundation.org, sukadev@...ux.vnet.ibm.com,
	tglx@...utronix.de, sam.bobroff@....ibm.com
Subject: Re: [V6,1/9] elf: Add new powerpc specifc core note sections

On Tue, 2014-02-12 at 07:56:45 UTC, Anshuman Khandual wrote:
> This patch adds four new ELF core note sections for powerpc
> transactional memory and one new ELF core note section for
> powerpc general miscellaneous debug registers. These addition
> of new ELF core note sections extends the existing ELF ABI
> without affecting it in any manner.
> 
> Acked-by: Andrew Morton <akpm@...ux-foundation.org>
> Signed-off-by: Anshuman Khandual <khandual@...ux.vnet.ibm.com>
> ---
>  include/uapi/linux/elf.h | 5 +++++
>  1 file changed, 5 insertions(+)
> 
> diff --git a/include/uapi/linux/elf.h b/include/uapi/linux/elf.h
> index ea9bf25..2260fc0 100644
> --- a/include/uapi/linux/elf.h
> +++ b/include/uapi/linux/elf.h
> @@ -379,6 +379,11 @@ typedef struct elf64_shdr {
>  #define NT_PPC_VMX	0x100		/* PowerPC Altivec/VMX registers */
>  #define NT_PPC_SPE	0x101		/* PowerPC SPE/EVR registers */
>  #define NT_PPC_VSX	0x102		/* PowerPC VSX registers */
> +#define NT_PPC_TM_SPR	0x103		/* PowerPC TM special registers */
> +#define NT_PPC_TM_CGPR	0x104		/* PowerpC TM checkpointed GPR */
> +#define NT_PPC_TM_CFPR	0x105		/* PowerPC TM checkpointed FPR */
> +#define NT_PPC_TM_CVMX	0x106		/* PowerPC TM checkpointed VMX */
> +#define NT_PPC_MISC	0x107		/* PowerPC miscellaneous registers */

This is a really terrible name, "MISC".

Having said that, I guess it's accurate. We have a whole bunch of regs that
have accrued over recent years that aren't accessible via ptrace.

It seems to me if we're adding a misc regset we should be adding everything we
might want to it that is currenty architected.

But currently you only include the PPR, TAR & DSCR.

Looking at Power ISA v2.07, I see the following that could be included:

  MMCR2
  MMCRA
  PMC1
  PMC2
  PMC3
  PMC4
  PMC5
  PMC6
  MMCR0
  EBBHR
  EBBRR
  BESCR
  SIAR
  SDAR
  CFAR?

Those are all new in 2.07 except for CFAR.

There might be more I missed, that was just a quick scan.

Some are only accessible when EBB is in use, maybe those could be a separate
regset.

cheers
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