[PATCH v1] bfd/readelf: Add core file support for FEAT_S1POE

[Alice Carlotti]

On Mon, Jun 29, 2026 at 07:31:58AM +0000, srinath.parvathaneni@arm.com wrote:
> From: Srinath Parvathaneni <srinath.parvathaneni@arm.com>
> 
> Hi,
> 
> Add support for `NT_ARM_POE` dumps/reads for core files.
> 
> Regression tested for aarch64-none-linux-gnu target and
> found no regressions.
> 
> Ok for binutils-master?

Ok, thanks.

Alice

> 
> Regards,
> Srinath.
> ---
>  bfd/elf.c            | 25 +++++++++++++++++++++++++
>  binutils/readelf.c   |  2 ++
>  include/elf/common.h |  2 ++
>  3 files changed, 29 insertions(+)
> 
> diff --git a/bfd/elf.c b/bfd/elf.c
> index c9a68404e9d..c7f557b8be6 100644
> --- a/bfd/elf.c
> +++ b/bfd/elf.c
> @@ -64,6 +64,7 @@ SECTION
>  /* Names of a pseudo-section which represent core notes.  */
>  #define NOTE_PSEUDO_SECTION_AARCH_FPMR		".reg-aarch-fpmr"
>  #define NOTE_PSEUDO_SECTION_AARCH_GCS		".reg-aarch-gcs"
> +#define NOTE_PSEUDO_SECTION_AARCH_POE		".reg-aarch-poe"
>  #define NOTE_PSEUDO_SECTION_AARCH_HW_BREAK	".reg-aarch-hw-break"
>  #define NOTE_PSEUDO_SECTION_AARCH_HW_WATCH	".reg-aarch-hw-watch"
>  #define NOTE_PSEUDO_SECTION_AARCH_MTE		".reg-aarch-mte"
> @@ -10735,6 +10736,15 @@ elfcore_grok_aarch_gcs (bfd *abfd, Elf_Internal_Note *note)
>    return elfcore_make_note_pseudosection (abfd, NOTE_PSEUDO_SECTION_AARCH_GCS, note);
>  }
>  
> +/* Convert NOTE into a bfd_section called ".reg-aarch-poe".  Return TRUE if
> +   successful, otherwise return FALSE.  */
> +
> +static bool
> +elfcore_grok_aarch_poe (bfd *abfd, Elf_Internal_Note *note)
> +{
> +  return elfcore_make_note_pseudosection (abfd, NOTE_PSEUDO_SECTION_AARCH_POE, note);
> +}
> +
>  /* Convert NOTE into the appropriate note pseudo-section for the AArch64 FPMR.
>   * Return TRUE if successful, otherwise return FALSE.  */
>  
> @@ -11179,6 +11189,7 @@ elfcore_grok_note (bfd *abfd, Elf_Internal_Note *note)
>  	case NT_ARC_V2:		return elfcore_grok_arc_v2 (abfd, note);
>  	case NT_ARM_FPMR:	return elfcore_grok_aarch_fpmr (abfd, note);
>  	case NT_ARM_GCS:	return elfcore_grok_aarch_gcs (abfd, note);
> +	case NT_ARM_POE:	return elfcore_grok_aarch_poe (abfd, note);
>  	case NT_ARM_HW_BREAK:	return elfcore_grok_aarch_hw_break (abfd, note);
>  	case NT_ARM_HW_WATCH:	return elfcore_grok_aarch_hw_watch (abfd, note);
>  	case NT_ARM_PAC_MASK:	return elfcore_grok_aarch_pauth (abfd, note);
> @@ -12900,6 +12911,19 @@ elfcore_write_aarch_gcs (bfd *abfd, char *buf, int *bufsiz,
>  			     aarch_gcs, size);
>  }
>  
> +/* Write the buffer of POE register values in AARCH_POE (length SIZE) into
> +   the note buffer BUF and update *BUFSIZ.  ABFD is the bfd the note is being
> +   written into.  Return a pointer to the new start of the note buffer, to
> +   replace BUF which may no longer be valid.  */
> +
> +static char *
> +elfcore_write_aarch_poe (bfd *abfd, char *buf, int *bufsiz,
> +			 const void *aarch_poe, int size)
> +{
> +  return elfcore_write_note (abfd, buf, bufsiz, NOTE_NAME_LINUX, NT_ARM_POE,
> +			     aarch_poe, size);
> +}
> +
>  /* Write the buffer of FPMR value in AARCH_FPMR (length SIZE) into
>     the note buffer BUF and update *BUFSIZ.  ABFD is the bfd the note is being
>     written into.  Return a pointer to the new start of the note buffer, to
> @@ -13024,6 +13048,7 @@ elfcore_write_register_note (bfd *abfd,
>      {
>        { NOTE_PSEUDO_SECTION_AARCH_FPMR,       elfcore_write_aarch_fpmr},
>        { NOTE_PSEUDO_SECTION_AARCH_GCS,        elfcore_write_aarch_gcs},
> +      { NOTE_PSEUDO_SECTION_AARCH_POE,        elfcore_write_aarch_poe},
>        { NOTE_PSEUDO_SECTION_AARCH_HW_BREAK,   elfcore_write_aarch_hw_break},
>        { NOTE_PSEUDO_SECTION_AARCH_HW_WATCH,   elfcore_write_aarch_hw_watch},
>        { NOTE_PSEUDO_SECTION_AARCH_MTE,        elfcore_write_aarch_mte},
> diff --git a/binutils/readelf.c b/binutils/readelf.c
> index bf27f9eec23..61354d7ab11 100644
> --- a/binutils/readelf.c
> +++ b/binutils/readelf.c
> @@ -21915,6 +21915,8 @@ get_note_type (Filedata * filedata, unsigned e_type)
>  	return _("NT_ARM_PAC_ENABLED_KEYS (AArch64 pointer authentication enabled keys)");
>        case NT_ARM_FPMR:
>  	return _("NT_ARM_FPMR (AArch64 Floating Point Mode Register)");
> +      case NT_ARM_POE:
> +	return _("NT_ARM_POE (AArch64 Permission Overlay Extension Register)");
>        case NT_ARC_V2:
>  	return _("NT_ARC_V2 (ARC HS accumulator/extra registers)");
>        case NT_RISCV_CSR:
> diff --git a/include/elf/common.h b/include/elf/common.h
> index 1ae68221a89..f811b8daeb5 100644
> --- a/include/elf/common.h
> +++ b/include/elf/common.h
> @@ -760,6 +760,8 @@
>  					/*   Note: name must be "LINUX".  */
>  #define NT_ARM_FPMR     0x40e           /* AArch64 FPMR.  */
>  					/*   Note: name must be "LINUX".  */
> +#define NT_ARM_POE	0x40f		/* AArch64 POE register.  */
> +					/*   Note: name must be "LINUX".  */
>  #define NT_ARM_GCS	0x410		/* AArch64 Guarded Control Stack
>  					   registers.  */
>  					/*   Note  name must be "LINUX".  */
> -- 
> 2.43.0
>