Hi Aaron,
On Mon, Jun 30, 2025 at 11:12:25PM -0400, Aaron Merey wrote:
> Signed-off-by: Aaron Merey <ame...@redhat.com>
> ---
> doc/Makefile.am | 1 +
> doc/elf_gnu_hash.3 | 1 +
> doc/elf_hash.3 | 20 +++++++++++++++++---
> 3 files changed, 19 insertions(+), 3 deletions(-)
> create mode 100644 doc/elf_gnu_hash.3
>
> diff --git a/doc/Makefile.am b/doc/Makefile.am
> index 129c612d..98712576 100644
> --- a/doc/Makefile.am
> +++ b/doc/Makefile.am
> @@ -75,6 +75,7 @@ notrans_dist_man3_MANS= elf32_checksum.3 \
> elf_getshnum.3 \
> elf_getshstrndx.3 \
> elf_hash.3 \
> + elf_gnu_hash.3 \
> elf_kind.3 \
> elf_memory.3 \
> elf_ndxscn.3 \
OK.
> diff --git a/doc/elf_gnu_hash.3 b/doc/elf_gnu_hash.3
> new file mode 100644
> index 00000000..d87463f1
> --- /dev/null
> +++ b/doc/elf_gnu_hash.3
> @@ -0,0 +1 @@
> +.so man3/elf_hash.3
> diff --git a/doc/elf_hash.3 b/doc/elf_hash.3
> index 1e06d888..2313f3b5 100644
> --- a/doc/elf_hash.3
> +++ b/doc/elf_hash.3
> @@ -1,13 +1,14 @@
> .TH ELF_HASH 3 2025-03-31 "Libelf" "Libelf Programmer's Manual"
>
> .SH NAME
> -elf_hash \- Compute the standard ELF hash of a string.
> +elf_hash, elf_gnu_hash \- Compute the standard ELF hash of a string.
standard or GNU?
> .SH SYNOPSIS
> .nf
> #include <libelf.h>
>
> .BI "unsigned long int elf_hash(const char *" string ");"
> +.BI "unsigned long int elf_gnu_hash(const char *" string ");"
OK.
> .SH DESCRIPTION
> The
> @@ -18,13 +19,21 @@ symbol table hashing. The hash function is used in
> SHT_HASH sections as
> it avoids generating architecture-dependent values and is suitable for use
> across architectures.
>
> +The
> +.BR elf_gnu_hash
> +function computes the GNU-style hash value of a null-terminated string,
> +used in
> +.B SHT_GNU_HASH
> +sections. This method is more space- and time-efficient in dynamic symbol
> lookup
> +compared to the standard ELF hash, particularly for larger symbol tables.
Yes, but that is the table setup. But the funcion just calculates a
hash value. The hash is also 32bits, maybe it is slightly faster?
> .SH PARAMETERS
> .TP
> .I string
> NULL-terminated string to be hashed.
>
> .SH RETURN VALUE
> -This function returns the standard ELF hash value for
> +These functions return a hash value for
> .IR string .
> Only the lower 32 bits of the return value are used.
OK.
> @@ -43,9 +52,14 @@ Interface Attribute Value
> T{
> .na
> .nh
> -.BR elf_hash ()
> +.BR elf_hash (),\~elf_gnu_hash ()
> T} Thread safety MT-Safe
> .TE
>
> .SH REPORTING BUGS
> Report bugs to <elfutils-devel@sourceware.org> or
> https://sourceware.org/bugzilla/.
> +
> +.SH HISTORY
> +.B elf_gnu_hash
> +first appeared in elfutils 0.122. This function is a elfutils libelf
> extension and
> +may not be available in other libelf implementations.
OK.
Thanks,
Mark
