From 9fc639f654dc004736836613be703e6bed0c36a8 Mon Sep 17 00:00:00 2001 From: Adhemerval Zanella Date: Thu, 4 Jul 2024 10:09:07 -0300 Subject: elf: Make dl-rseq-symbols Linux only And avoid a Hurd build failures. Checked on x86_64-linux-gnu. --- sysdeps/unix/sysv/linux/Makefile | 4 ++ sysdeps/unix/sysv/linux/dl-rseq-symbols.S | 64 +++++++++++++++++++++++++++++++ 2 files changed, 68 insertions(+) create mode 100644 sysdeps/unix/sysv/linux/dl-rseq-symbols.S (limited to 'sysdeps/unix/sysv') diff --git a/sysdeps/unix/sysv/linux/Makefile b/sysdeps/unix/sysv/linux/Makefile index ae66590e91..097b5a26fc 100644 --- a/sysdeps/unix/sysv/linux/Makefile +++ b/sysdeps/unix/sysv/linux/Makefile @@ -616,6 +616,10 @@ tests += \ endif ifeq ($(subdir),elf) +dl-routines += \ + dl-rseq-symbols \ + # dl-routines + sysdep-rtld-routines += \ dl-brk \ dl-getcwd \ diff --git a/sysdeps/unix/sysv/linux/dl-rseq-symbols.S b/sysdeps/unix/sysv/linux/dl-rseq-symbols.S new file mode 100644 index 0000000000..b4bba06a99 --- /dev/null +++ b/sysdeps/unix/sysv/linux/dl-rseq-symbols.S @@ -0,0 +1,64 @@ +/* Define symbols used by rseq. + Copyright (C) 2024 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, see + . */ + +#include + +#if __WORDSIZE == 64 +#define RSEQ_OFFSET_SIZE 8 +#else +#define RSEQ_OFFSET_SIZE 4 +#endif + +/* 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. */ + + .globl __rseq_size + .type __rseq_size, %object + .size __rseq_size, 4 + .hidden _rseq_size + .globl _rseq_size + .type _rseq_size, %object + .size _rseq_size, 4 + .section .data.rel.ro + .balign 4 +__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. */ + + .globl __rseq_offset + .type __rseq_offset, %object + .size __rseq_offset, RSEQ_OFFSET_SIZE + .hidden _rseq_offset + .globl _rseq_offset + .type _rseq_offset, %object + .size _rseq_offset, RSEQ_OFFSET_SIZE + .section .data.rel.ro + .balign RSEQ_OFFSET_SIZE +__rseq_offset: +_rseq_offset: + .zero RSEQ_OFFSET_SIZE -- cgit 1.4.1