Ping Re: [PATCH v1] PowerPC: Add NT_PPC_DMR core file support

[Abhay Kandpal]

Hi all,

Just a gentle ping to see if anyone has had a chance to review this patch,
or if any further changes are needed on my end.

Regards
Abhay Kandpal


On 13/07/26 13:39, Abhay Kandpal wrote:
> Hi all,
> Just a gentle ping to see if anyone has had a chance to review this patch,
> or if any further changes are needed on my end.
>
> Regards
> Abhay Kandpal
>
> On 22/06/26 15:44, Abhay Kandpal wrote:
>> Add BFD and readelf support for the new NT_PPC_DMR note type, which
>> carries the contents of the Dense Math Registers (DMR) available on
>> a future PowerPC processor. The DMR register set consists of eight
>> 1024-bit registers introduced by the Dense Math facility in a future
>> Power ISA revision.
>>
>> GDB support for reading and writing DMR registers, both from live
>> processes and from core files, will be added as a follow-up patch.
>>
>> bfd/
>> 	* elf-bfd.h (elfcore_write_ppc_dmr): Declare.
>> 	* elf.c (NOTE_PSEUDO_SECTION_PPC_DMR): Define.
>> 	(elfcore_grok_ppc_dmr): New function.
>> 	(elfcore_grok_note) <NT_PPC_DMR>: Handle it.
>> 	(elfcore_write_ppc_dmr): New function.
>> 	(elfcore_write_register_note): Handle .reg-ppc-dmr.
>>
>> binutils/
>> 	* readelf.c (get_note_type) <NT_PPC_DMR>: Handle it.
>>
>> include/
>> 	* elf/common.h (NT_PPC_DMR): New macro.
>> ---
>> This patch is reg tested.
>>
>>   bfd/elf-bfd.h        |  2 ++
>>   bfd/elf.c            | 20 ++++++++++++++++++++
>>   binutils/readelf.c   |  2 ++
>>   include/elf/common.h |  2 ++
>>   4 files changed, 26 insertions(+)
>>
>> diff --git a/bfd/elf-bfd.h b/bfd/elf-bfd.h
>> index 88d35925987..0605d31107f 100644
>> --- a/bfd/elf-bfd.h
>> +++ b/bfd/elf-bfd.h
>> @@ -3100,6 +3100,8 @@ extern char *elfcore_write_ppc_tm_cppr
>>     (bfd *, char *, int *, const void *, int);
>>   extern char *elfcore_write_ppc_tm_cdscr
>>     (bfd *, char *, int *, const void *, int);
>> +extern char *elfcore_write_ppc_dmr
>> +  (bfd *, char *, int *, const void *, int);
>>   extern char *elfcore_write_s390_timer
>>     (bfd *, char *, int *, const void *, int);
>>   extern char *elfcore_write_s390_todcmp
>> diff --git a/bfd/elf.c b/bfd/elf.c
>> index c9a68404e9d..d0769d03644 100644
>> --- a/bfd/elf.c
>> +++ b/bfd/elf.c
>> @@ -80,6 +80,7 @@ SECTION
>>   #define NOTE_PSEUDO_SECTION_LOONGARCH_LASX	".reg-loongarch-lasx"
>>   #define NOTE_PSEUDO_SECTION_LOONGARCH_LBT	".reg-loongarch-lbt"
>>   #define NOTE_PSEUDO_SECTION_LOONGARCH_LSX	".reg-loongarch-lsx"
>> +#define NOTE_PSEUDO_SECTION_PPC_DMR		".reg-ppc-dmr"
>>   #define NOTE_PSEUDO_SECTION_PPC_DSCR		".reg-ppc-dscr"
>>   #define NOTE_PSEUDO_SECTION_PPC_EBB		".reg-ppc-ebb"
>>   #define NOTE_PSEUDO_SECTION_PPC_PMU		".reg-ppc-pmu" @@ -10507,6 +10508,12 @@ elfcore_grok_ppc_vsx (bfd *abfd, 
>> Elf_Internal_Note *note) return elfcore_make_note_pseudosection 
>> (abfd, NOTE_PSEUDO_SECTION_PPC_VSX, note); } +static bool 
>> +elfcore_grok_ppc_dmr (bfd *abfd, Elf_Internal_Note *note) +{ + 
>> return elfcore_make_note_pseudosection (abfd, 
>> NOTE_PSEUDO_SECTION_PPC_DMR, note); +} + static bool 
>> elfcore_grok_ppc_tar (bfd *abfd, Elf_Internal_Note *note) { @@ 
>> -11193,6 +11200,7 @@ elfcore_grok_note (bfd *abfd, Elf_Internal_Note 
>> *note) case NT_LARCH_LASX: return elfcore_grok_loongarch_lasx (abfd, 
>> note); case NT_LARCH_LBT: return elfcore_grok_loongarch_lbt (abfd, 
>> note); case NT_LARCH_LSX: return elfcore_grok_loongarch_lsx (abfd, 
>> note); + case NT_PPC_DMR: return elfcore_grok_ppc_dmr (abfd, note); 
>> case NT_PPC_DSCR: return elfcore_grok_ppc_dscr (abfd, note); case 
>> NT_PPC_EBB: return elfcore_grok_ppc_ebb (abfd, note); case 
>> NT_PPC_PMU: return elfcore_grok_ppc_pmu (abfd, note); @@ -12459,6 
>> +12467,17 @@ elfcore_write_ppc_vsx (bfd *abfd, NOTE_NAME_LINUX, 
>> NT_PPC_VSX, ppc_vsx, size); } +char * +elfcore_write_ppc_dmr (bfd 
>> *abfd, + char *buf, + int *bufsiz, + const void *ppc_dmr, + int size) 
>> +{ + return elfcore_write_note (abfd, buf, bufsiz, + NOTE_NAME_LINUX, 
>> NT_PPC_DMR, ppc_dmr, size); +} + char * elfcore_write_ppc_tar (bfd 
>> *abfd, char *buf, @@ -13040,6 +13059,7 @@ elfcore_write_register_note 
>> (bfd *abfd, { NOTE_PSEUDO_SECTION_LOONGARCH_LASX, 
>> elfcore_write_loongarch_lasx}, { NOTE_PSEUDO_SECTION_LOONGARCH_LBT, 
>> elfcore_write_loongarch_lbt}, { NOTE_PSEUDO_SECTION_LOONGARCH_LSX, 
>> elfcore_write_loongarch_lsx}, + { NOTE_PSEUDO_SECTION_PPC_DMR, 
>> elfcore_write_ppc_dmr}, { NOTE_PSEUDO_SECTION_PPC_DSCR, 
>> elfcore_write_ppc_dscr}, { NOTE_PSEUDO_SECTION_PPC_EBB, 
>> elfcore_write_ppc_ebb}, { NOTE_PSEUDO_SECTION_PPC_PMU, 
>> elfcore_write_ppc_pmu}, diff --git a/binutils/readelf.c 
>> b/binutils/readelf.c index bf27f9eec23..aed0b058732 100644 --- 
>> a/binutils/readelf.c +++ b/binutils/readelf.c @@ -21847,6 +21847,8 @@ 
>> get_note_type (Filedata * filedata, unsigned e_type) return _("NT_PPC_TM_CPPR (ppc checkpointed PPR register)");
>>         case NT_PPC_TM_CDSCR:
>>   	return _("NT_PPC_TM_CDSCR (ppc checkpointed DSCR register)");
>> +      case NT_PPC_DMR:
>> +	return _("NT_PPC_DMR (ppc Dense Math registers)");
>>         case NT_386_TLS:
>>   	return _("NT_386_TLS (x86 TLS information)");
>>         case NT_386_IOPERM:
>> diff --git a/include/elf/common.h b/include/elf/common.h
>> index 1ae68221a89..bd327194b7e 100644
>> --- a/include/elf/common.h
>> +++ b/include/elf/common.h
>> @@ -686,6 +686,8 @@
>>   					/*   note name must be "LINUX".  */
>>   #define NT_PPC_TM_CDSCR	0x10f		/* PowerPC TM checkpointed Data SCR */
>>   					/*   note name must be "LINUX".  */
>> +#define NT_PPC_DMR	0x113		/* PowerPC Dense Math Registers */
>> +					/*   note name must be "LINUX".  */
>>   #define NT_386_TLS	0x200		/* x86 TLS information */
>>   					/*   note name must be "LINUX".  */
>>   #define NT_386_IOPERM	0x201		/* x86 io permissions */
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