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nptl: add rtld_hidden_proto to __rseq_size and __rseq_offset

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This allows accessing the internal aliases of __rseq_size and
__rseq_offset from ld.so without ifdefs and avoids dynamic symbol
binding at run time for both variables.

Signed-off-by: Michael Jeanson <mjeanson@efficios.com>
Reviewed-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Reviewed-by: Florian Weimer <fweimer@redhat.com>
This commit is contained in:
Michael Jeanson
2024-11-20 22:28:07 +00:00
parent 304221775c
commit be440f6c38
2 changed files with 28 additions and 15 deletions
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27
sysdeps/unix/sysv/linux/dl-rseq-symbols.S
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@@ -27,14 +27,18 @@
/* Some targets define a macro to denote the zero register. */
#undef zero
/* Define 2 symbols: '__rseq_size' is public const and '_rseq_size' (an
alias of '__rseq_size') is hidden and writable for internal use by the
dynamic linker which will initialize the value both symbols point to
before copy relocations take place. */
/* Define 3 symbols: '__rseq_size' is public const and then '_rseq_size' and
'__GI___rseq_size' (both aliases of '__rseq_size') are hidden, '_rseq_size'
is writable for internal use by the dynamic linker which will initialize
the value the symbols point to before copy relocations take place. */
.globl __rseq_size
.type __rseq_size, %object
.size __rseq_size, 4
.hidden __GI___rseq_size
.globl __GI___rseq_size
.type __GI___rseq_size, %object
.size __GI___rseq_size, 4
.hidden _rseq_size
.globl _rseq_size
.type _rseq_size, %object
@@ -42,17 +46,23 @@
.section .data.rel.ro
.balign 4
__rseq_size:
__GI___rseq_size:
_rseq_size:
.zero 4
/* Define 2 symbols: '__rseq_offset' is public const and '_rseq_offset' (an
alias of '__rseq_offset') is hidden and writable for internal use by the
dynamic linker which will initialize the value both symbols point to
before copy relocations take place. */
/* Define 3 symbols: '__rseq_offset' is public const and then '_rseq_offset'
and '__GI___rseq_offset' (both aliases of '__rseq_offset') are hidden,
'_rseq_offset' is writable for internal use by the dynamic linker which will
initialize the value the symbols point to before copy relocations take
place. */
.globl __rseq_offset
.type __rseq_offset, %object
.size __rseq_offset, RSEQ_OFFSET_SIZE
.hidden __GI___rseq_offset
.globl __GI___rseq_offset
.type __GI___rseq_offset, %object
.size __GI___rseq_offset, RSEQ_OFFSET_SIZE
.hidden _rseq_offset
.globl _rseq_offset
.type _rseq_offset, %object
@@ -60,5 +70,6 @@ _rseq_size:
.section .data.rel.ro
.balign RSEQ_OFFSET_SIZE
__rseq_offset:
__GI___rseq_offset:
_rseq_offset:
.zero RSEQ_OFFSET_SIZE