On 12/03/2014 10:52 AM, Michael Ellerman wrote:
> 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 <a...@linux-foundation.org>
>> Signed-off-by: Anshuman Khandual <khand...@linux.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 I believe they also need to be part of the thread_struct structure to be
accessible from ptrace.
>
> But currently you only include the PPR, TAR & DSCR.
Yeah, thats what we started with.
>
> 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?
MMCRA, PMC[1..6], EBBHR, BESCR, EBBRR, CFAR are not part of the thread struct.
>
> 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.
Yeah we can have one more regset for EBB specific registers.
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