[v7,3/8] nptl: Add public __rseq_feature_size symbol

Message ID	20240201193648.584917-4-mjeanson@efficios.com
State	New
Headers	show Return-Path: <libc-alpha-bounces+incoming=patchwork.ozlabs.org@sourceware.org> DMARC-Filter: OpenDMARC Filter v1.4.2 sourceware.org 237443858017 From: Michael Jeanson <mjeanson@efficios.com> To: libc-alpha@sourceware.org Cc: Michael Jeanson <mjeanson@efficios.com>, Florian Weimer <fweimer@redhat.com>, Carlos O'Donell <carlos@redhat.com>, Mathieu Desnoyers <mathieu.desnoyers@efficios.com> Subject: [PATCH v7 3/8] nptl: Add public __rseq_feature_size symbol Date: Thu, 1 Feb 2024 14:36:43 -0500 Message-Id: <20240201193648.584917-4-mjeanson@efficios.com> In-Reply-To: <20240201193648.584917-1-mjeanson@efficios.com> References: <20240201193648.584917-1-mjeanson@efficios.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: list Errors-To: libc-alpha-bounces+incoming=patchwork.ozlabs.org@sourceware.org
Series	[v7,1/8] nptl: fix potential merge of __rseq_* relro symbols \| expand [v7,1/8] nptl: fix potential merge of __rseq_* relro symbols [v7,2/8] Add rseq extensible ABI support [v7,3/8] nptl: Add public __rseq_feature_size symbol [v7,4/8] nptl: Add features to internal 'struct rseq_area' [v7,5/8] nptl: Add rseq internal utils [v7,6/8] x86-64: Add rseq_load32_load32_relaxed [v7,7/8] aarch64: Add rseq_load32_load32_relaxed [v7,8/8] Linux: Use rseq to accelerate getcpu

diff --git a/csu/rseq-sizes.sym b/csu/rseq-sizes.sym index c959758ff0..dde53bfa60 100644 --- a/csu/rseq-sizes.sym +++ b/csu/rseq-sizes.sym @@ -4,5 +4,8 @@ RSEQ_SIZE_SIZE sizeof (unsigned int) RSEQ_SIZE_ALIGN __alignof (unsigned int) +RSEQ_FEATURE_SIZE_SIZE sizeof (unsigned int) +RSEQ_FEATURE_SIZE_ALIGN __alignof (unsigned int) + RSEQ_OFFSET_SIZE sizeof (ptrdiff_t) RSEQ_OFFSET_ALIGN __alignof (ptrdiff_t) diff --git a/elf/dl-rseq-symbols.S b/elf/dl-rseq-symbols.S index 2d8e88367f..709188ae22 100644 --- a/elf/dl-rseq-symbols.S +++ b/elf/dl-rseq-symbols.S @@ -38,6 +38,23 @@ __rseq_size: _rseq_size: .zero RSEQ_SIZE_SIZE +/* Define 2 symbols, __rseq_feature_size is public const and + _rseq_feature_size, which is an alias of __rseq_feature_size, but hidden and + writable for internal use. */ + + .globl __rseq_feature_size + .type __rseq_feature_size, %object + .size __rseq_feature_size, RSEQ_FEATURE_SIZE_SIZE + .hidden _rseq_feature_size + .globl _rseq_feature_size + .type _rseq_feature_size, %object + .size _rseq_feature_size, RSEQ_FEATURE_SIZE_SIZE + .section .data.rel.ro + .balign RSEQ_FEATURE_SIZE_ALIGN +__rseq_feature_size: +_rseq_feature_size: + .zero RSEQ_FEATURE_SIZE_SIZE + /* Define 2 symbols, __rseq_offset is public const and _rseq_offset, which is an alias of __rseq_offset, but hidden and writable for internal use. */ diff --git a/manual/threads.texi b/manual/threads.texi index e5544ff3da..2c9aaa9fb5 100644 --- a/manual/threads.texi +++ b/manual/threads.texi @@ -1011,6 +1011,14 @@ registration is successful, @code{__rseq_size} is at least 32 (the initial size of @code{struct rseq}). @end deftypevar +@deftypevar {unsigned int} __rseq_feature_size +@standards{Linux, sys/rseq.h} +This variable is either zero (if restartable sequence registration +failed or has been disabled) or the size of the restartable sequence +features. If registration is successful, @code{__rseq_feature_size} +is at least 20 (the initial feature size of @code{struct rseq}). +@end deftypevar + @deftypevar {unsigned int} __rseq_flags @standards{Linux, sys/rseq.h} The flags used during restartable sequence registration with the kernel. diff --git a/sysdeps/nptl/dl-tls_init_tp.c b/sysdeps/nptl/dl-tls_init_tp.c index 7aa15558e6..8f19c22a74 100644 --- a/sysdeps/nptl/dl-tls_init_tp.c +++ b/sysdeps/nptl/dl-tls_init_tp.c @@ -48,6 +48,7 @@ const unsigned int __rseq_flags; /* The variables are in .data.relro but are not yet write-protected. */ extern unsigned int _rseq_size attribute_relro attribute_hidden; +extern unsigned int _rseq_feature_size attribute_relro attribute_hidden; extern ptrdiff_t _rseq_offset attribute_relro attribute_hidden; void @@ -108,6 +109,7 @@ __tls_init_tp (void) if (rseq_register_current_thread (pd, do_rseq)) { _rseq_size = GLRO (dl_tls_rseq_size); + _rseq_feature_size = GLRO (dl_tls_rseq_feature_size); } #ifdef RSEQ_SIG diff --git a/sysdeps/unix/sysv/linux/Versions b/sysdeps/unix/sysv/linux/Versions index 268ba1b6ac..055be26dde 100644 --- a/sysdeps/unix/sysv/linux/Versions +++ b/sysdeps/unix/sysv/linux/Versions @@ -356,6 +356,9 @@ ld { __rseq_offset; __rseq_size; } + GLIBC_2.40 { + __rseq_feature_size; + } GLIBC_PRIVATE { __nptl_change_stack_perm; } diff --git a/sysdeps/unix/sysv/linux/aarch64/ld.abilist b/sysdeps/unix/sysv/linux/aarch64/ld.abilist index 5151c0781d..93039b756d 100644 --- a/sysdeps/unix/sysv/linux/aarch64/ld.abilist +++ b/sysdeps/unix/sysv/linux/aarch64/ld.abilist @@ -7,3 +7,4 @@ GLIBC_2.34 __rtld_version_placeholder F GLIBC_2.35 __rseq_flags D 0x4 GLIBC_2.35 __rseq_offset D 0x8 GLIBC_2.35 __rseq_size D 0x4 +GLIBC_2.40 __rseq_feature_size D 0x4 diff --git a/sysdeps/unix/sysv/linux/alpha/ld.abilist b/sysdeps/unix/sysv/linux/alpha/ld.abilist index 3e296c5473..a18f952057 100644 --- a/sysdeps/unix/sysv/linux/alpha/ld.abilist +++ b/sysdeps/unix/sysv/linux/alpha/ld.abilist @@ -6,4 +6,5 @@ GLIBC_2.34 __rtld_version_placeholder F GLIBC_2.35 __rseq_flags D 0x4 GLIBC_2.35 __rseq_offset D 0x8 GLIBC_2.35 __rseq_size D 0x4 +GLIBC_2.40 __rseq_feature_size D 0x4 GLIBC_2.4 __stack_chk_guard D 0x8 diff --git a/sysdeps/unix/sysv/linux/arc/ld.abilist b/sysdeps/unix/sysv/linux/arc/ld.abilist index 55f0c2ab9c..31156b6ee1 100644 --- a/sysdeps/unix/sysv/linux/arc/ld.abilist +++ b/sysdeps/unix/sysv/linux/arc/ld.abilist @@ -7,3 +7,4 @@ GLIBC_2.34 __rtld_version_placeholder F GLIBC_2.35 __rseq_flags D 0x4 GLIBC_2.35 __rseq_offset D 0x4 GLIBC_2.35 __rseq_size D 0x4 +GLIBC_2.40 __rseq_feature_size D 0x4 diff --git a/sysdeps/unix/sysv/linux/arm/be/ld.abilist b/sysdeps/unix/sysv/linux/arm/be/ld.abilist index f1da2c636d..dac120b385 100644 --- a/sysdeps/unix/sysv/linux/arm/be/ld.abilist +++ b/sysdeps/unix/sysv/linux/arm/be/ld.abilist @@ -2,6 +2,7 @@ GLIBC_2.34 __rtld_version_placeholder F GLIBC_2.35 __rseq_flags D 0x4 GLIBC_2.35 __rseq_offset D 0x4 GLIBC_2.35 __rseq_size D 0x4 +GLIBC_2.40 __rseq_feature_size D 0x4 GLIBC_2.4 __libc_stack_end D 0x4 GLIBC_2.4 __stack_chk_guard D 0x4 GLIBC_2.4 __tls_get_addr F diff --git a/sysdeps/unix/sysv/linux/arm/le/ld.abilist b/sysdeps/unix/sysv/linux/arm/le/ld.abilist index f1da2c636d..dac120b385 100644 --- a/sysdeps/unix/sysv/linux/arm/le/ld.abilist +++ b/sysdeps/unix/sysv/linux/arm/le/ld.abilist @@ -2,6 +2,7 @@ GLIBC_2.34 __rtld_version_placeholder F GLIBC_2.35 __rseq_flags D 0x4 GLIBC_2.35 __rseq_offset D 0x4 GLIBC_2.35 __rseq_size D 0x4 +GLIBC_2.40 __rseq_feature_size D 0x4 GLIBC_2.4 __libc_stack_end D 0x4 GLIBC_2.4 __stack_chk_guard D 0x4 GLIBC_2.4 __tls_get_addr F diff --git a/sysdeps/unix/sysv/linux/csky/ld.abilist b/sysdeps/unix/sysv/linux/csky/ld.abilist index 7f482276ed..088f000c4e 100644 --- a/sysdeps/unix/sysv/linux/csky/ld.abilist +++ b/sysdeps/unix/sysv/linux/csky/ld.abilist @@ -7,3 +7,4 @@ GLIBC_2.34 __rtld_version_placeholder F GLIBC_2.35 __rseq_flags D 0x4 GLIBC_2.35 __rseq_offset D 0x4 GLIBC_2.35 __rseq_size D 0x4 +GLIBC_2.40 __rseq_feature_size D 0x4 diff --git a/sysdeps/unix/sysv/linux/hppa/ld.abilist b/sysdeps/unix/sysv/linux/hppa/ld.abilist index 7f5527fb30..1fb6c33c7b 100644 --- a/sysdeps/unix/sysv/linux/hppa/ld.abilist +++ b/sysdeps/unix/sysv/linux/hppa/ld.abilist @@ -6,4 +6,5 @@ GLIBC_2.34 __rtld_version_placeholder F GLIBC_2.35 __rseq_flags D 0x4 GLIBC_2.35 __rseq_offset D 0x4 GLIBC_2.35 __rseq_size D 0x4 +GLIBC_2.40 __rseq_feature_size D 0x4 GLIBC_2.4 __stack_chk_guard D 0x4 diff --git a/sysdeps/unix/sysv/linux/i386/ld.abilist b/sysdeps/unix/sysv/linux/i386/ld.abilist index 9c4a45d8dc..d9761c34e3 100644 --- a/sysdeps/unix/sysv/linux/i386/ld.abilist +++ b/sysdeps/unix/sysv/linux/i386/ld.abilist @@ -7,3 +7,4 @@ GLIBC_2.34 __rtld_version_placeholder F GLIBC_2.35 __rseq_flags D 0x4 GLIBC_2.35 __rseq_offset D 0x4 GLIBC_2.35 __rseq_size D 0x4 +GLIBC_2.40 __rseq_feature_size D 0x4 diff --git a/sysdeps/unix/sysv/linux/loongarch/lp64/ld.abilist b/sysdeps/unix/sysv/linux/loongarch/lp64/ld.abilist index 93fcd64eee..f5dbb17ec9 100644 --- a/sysdeps/unix/sysv/linux/loongarch/lp64/ld.abilist +++ b/sysdeps/unix/sysv/linux/loongarch/lp64/ld.abilist @@ -6,3 +6,4 @@ GLIBC_2.36 __stack_chk_guard D 0x8 GLIBC_2.36 __tls_get_addr F GLIBC_2.36 _dl_mcount F GLIBC_2.36 _r_debug D 0x28 +GLIBC_2.40 __rseq_feature_size D 0x4 diff --git a/sysdeps/unix/sysv/linux/m68k/coldfire/ld.abilist b/sysdeps/unix/sysv/linux/m68k/coldfire/ld.abilist index f1da2c636d..dac120b385 100644 --- a/sysdeps/unix/sysv/linux/m68k/coldfire/ld.abilist +++ b/sysdeps/unix/sysv/linux/m68k/coldfire/ld.abilist @@ -2,6 +2,7 @@ GLIBC_2.34 __rtld_version_placeholder F GLIBC_2.35 __rseq_flags D 0x4 GLIBC_2.35 __rseq_offset D 0x4 GLIBC_2.35 __rseq_size D 0x4 +GLIBC_2.40 __rseq_feature_size D 0x4 GLIBC_2.4 __libc_stack_end D 0x4 GLIBC_2.4 __stack_chk_guard D 0x4 GLIBC_2.4 __tls_get_addr F diff --git a/sysdeps/unix/sysv/linux/m68k/m680x0/ld.abilist b/sysdeps/unix/sysv/linux/m68k/m680x0/ld.abilist index dadbf852d0..d78f7ea1e3 100644 --- a/sysdeps/unix/sysv/linux/m68k/m680x0/ld.abilist +++ b/sysdeps/unix/sysv/linux/m68k/m680x0/ld.abilist @@ -6,4 +6,5 @@ GLIBC_2.34 __rtld_version_placeholder F GLIBC_2.35 __rseq_flags D 0x4 GLIBC_2.35 __rseq_offset D 0x4 GLIBC_2.35 __rseq_size D 0x4 +GLIBC_2.40 __rseq_feature_size D 0x4 GLIBC_2.4 __stack_chk_guard D 0x4 diff --git a/sysdeps/unix/sysv/linux/microblaze/ld.abilist b/sysdeps/unix/sysv/linux/microblaze/ld.abilist index 89a0b7e4fd..c83b62dce7 100644 --- a/sysdeps/unix/sysv/linux/microblaze/ld.abilist +++ b/sysdeps/unix/sysv/linux/microblaze/ld.abilist @@ -7,3 +7,4 @@ GLIBC_2.34 __rtld_version_placeholder F GLIBC_2.35 __rseq_flags D 0x4 GLIBC_2.35 __rseq_offset D 0x4 GLIBC_2.35 __rseq_size D 0x4 +GLIBC_2.40 __rseq_feature_size D 0x4 diff --git a/sysdeps/unix/sysv/linux/mips/mips32/ld.abilist b/sysdeps/unix/sysv/linux/mips/mips32/ld.abilist index e304d1bb46..25dc3d1fd2 100644 --- a/sysdeps/unix/sysv/linux/mips/mips32/ld.abilist +++ b/sysdeps/unix/sysv/linux/mips/mips32/ld.abilist @@ -6,4 +6,5 @@ GLIBC_2.34 __rtld_version_placeholder F GLIBC_2.35 __rseq_flags D 0x4 GLIBC_2.35 __rseq_offset D 0x4 GLIBC_2.35 __rseq_size D 0x4 +GLIBC_2.40 __rseq_feature_size D 0x4 GLIBC_2.4 __stack_chk_guard D 0x4 diff --git a/sysdeps/unix/sysv/linux/mips/mips64/n32/ld.abilist b/sysdeps/unix/sysv/linux/mips/mips64/n32/ld.abilist index e304d1bb46..25dc3d1fd2 100644 --- a/sysdeps/unix/sysv/linux/mips/mips64/n32/ld.abilist +++ b/sysdeps/unix/sysv/linux/mips/mips64/n32/ld.abilist @@ -6,4 +6,5 @@ GLIBC_2.34 __rtld_version_placeholder F GLIBC_2.35 __rseq_flags D 0x4 GLIBC_2.35 __rseq_offset D 0x4 GLIBC_2.35 __rseq_size D 0x4 +GLIBC_2.40 __rseq_feature_size D 0x4 GLIBC_2.4 __stack_chk_guard D 0x4 diff --git a/sysdeps/unix/sysv/linux/mips/mips64/n64/ld.abilist b/sysdeps/unix/sysv/linux/mips/mips64/n64/ld.abilist index f26e594a13..4bdab645cf 100644 --- a/sysdeps/unix/sysv/linux/mips/mips64/n64/ld.abilist +++ b/sysdeps/unix/sysv/linux/mips/mips64/n64/ld.abilist @@ -6,4 +6,5 @@ GLIBC_2.34 __rtld_version_placeholder F GLIBC_2.35 __rseq_flags D 0x4 GLIBC_2.35 __rseq_offset D 0x8 GLIBC_2.35 __rseq_size D 0x4 +GLIBC_2.40 __rseq_feature_size D 0x4 GLIBC_2.4 __stack_chk_guard D 0x8 diff --git a/sysdeps/unix/sysv/linux/nios2/ld.abilist b/sysdeps/unix/sysv/linux/nios2/ld.abilist index 811ae9da2f..d2b742ec25 100644 --- a/sysdeps/unix/sysv/linux/nios2/ld.abilist +++ b/sysdeps/unix/sysv/linux/nios2/ld.abilist @@ -7,3 +7,4 @@ GLIBC_2.34 __rtld_version_placeholder F GLIBC_2.35 __rseq_flags D 0x4 GLIBC_2.35 __rseq_offset D 0x4 GLIBC_2.35 __rseq_size D 0x4 +GLIBC_2.40 __rseq_feature_size D 0x4 diff --git a/sysdeps/unix/sysv/linux/or1k/ld.abilist b/sysdeps/unix/sysv/linux/or1k/ld.abilist index cff2ffd23b..eb225ca4c5 100644 --- a/sysdeps/unix/sysv/linux/or1k/ld.abilist +++ b/sysdeps/unix/sysv/linux/or1k/ld.abilist @@ -6,3 +6,4 @@ GLIBC_2.35 __stack_chk_guard D 0x4 GLIBC_2.35 __tls_get_addr F GLIBC_2.35 _dl_mcount F GLIBC_2.35 _r_debug D 0x14 +GLIBC_2.40 __rseq_feature_size D 0x4 diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc32/ld.abilist b/sysdeps/unix/sysv/linux/powerpc/powerpc32/ld.abilist index b1073f0942..7a94751723 100644 --- a/sysdeps/unix/sysv/linux/powerpc/powerpc32/ld.abilist +++ b/sysdeps/unix/sysv/linux/powerpc/powerpc32/ld.abilist @@ -9,3 +9,4 @@ GLIBC_2.35 __rseq_flags D 0x4 GLIBC_2.35 __rseq_offset D 0x4 GLIBC_2.35 __rseq_size D 0x4 GLIBC_2.39 __parse_hwcap_3_4_and_convert_at_platform F +GLIBC_2.40 __rseq_feature_size D 0x4 diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc64/be/ld.abilist b/sysdeps/unix/sysv/linux/powerpc/powerpc64/be/ld.abilist index 40942a2cc6..f6bdd89083 100644 --- a/sysdeps/unix/sysv/linux/powerpc/powerpc64/be/ld.abilist +++ b/sysdeps/unix/sysv/linux/powerpc/powerpc64/be/ld.abilist @@ -9,3 +9,4 @@ GLIBC_2.35 __rseq_flags D 0x4 GLIBC_2.35 __rseq_offset D 0x8 GLIBC_2.35 __rseq_size D 0x4 GLIBC_2.39 __parse_hwcap_3_4_and_convert_at_platform F +GLIBC_2.40 __rseq_feature_size D 0x4 diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc64/le/ld.abilist b/sysdeps/unix/sysv/linux/powerpc/powerpc64/le/ld.abilist index 01f2694a4d..672bade9ba 100644 --- a/sysdeps/unix/sysv/linux/powerpc/powerpc64/le/ld.abilist +++ b/sysdeps/unix/sysv/linux/powerpc/powerpc64/le/ld.abilist @@ -9,3 +9,4 @@ GLIBC_2.35 __rseq_flags D 0x4 GLIBC_2.35 __rseq_offset D 0x8 GLIBC_2.35 __rseq_size D 0x4 GLIBC_2.39 __parse_hwcap_3_4_and_convert_at_platform F +GLIBC_2.40 __rseq_feature_size D 0x4 diff --git a/sysdeps/unix/sysv/linux/riscv/rv32/ld.abilist b/sysdeps/unix/sysv/linux/riscv/rv32/ld.abilist index 068368878e..d3be9236c2 100644 --- a/sysdeps/unix/sysv/linux/riscv/rv32/ld.abilist +++ b/sysdeps/unix/sysv/linux/riscv/rv32/ld.abilist @@ -7,3 +7,4 @@ GLIBC_2.34 __rtld_version_placeholder F GLIBC_2.35 __rseq_flags D 0x4 GLIBC_2.35 __rseq_offset D 0x4 GLIBC_2.35 __rseq_size D 0x4 +GLIBC_2.40 __rseq_feature_size D 0x4 diff --git a/sysdeps/unix/sysv/linux/riscv/rv64/ld.abilist b/sysdeps/unix/sysv/linux/riscv/rv64/ld.abilist index a7758a0e52..46b22238ce 100644 --- a/sysdeps/unix/sysv/linux/riscv/rv64/ld.abilist +++ b/sysdeps/unix/sysv/linux/riscv/rv64/ld.abilist @@ -7,3 +7,4 @@ GLIBC_2.34 __rtld_version_placeholder F GLIBC_2.35 __rseq_flags D 0x4 GLIBC_2.35 __rseq_offset D 0x8 GLIBC_2.35 __rseq_size D 0x4 +GLIBC_2.40 __rseq_feature_size D 0x4 diff --git a/sysdeps/unix/sysv/linux/s390/s390-32/ld.abilist b/sysdeps/unix/sysv/linux/s390/s390-32/ld.abilist index c15288394a..f438808c08 100644 --- a/sysdeps/unix/sysv/linux/s390/s390-32/ld.abilist +++ b/sysdeps/unix/sysv/linux/s390/s390-32/ld.abilist @@ -6,3 +6,4 @@ GLIBC_2.34 __rtld_version_placeholder F GLIBC_2.35 __rseq_flags D 0x4 GLIBC_2.35 __rseq_offset D 0x4 GLIBC_2.35 __rseq_size D 0x4 +GLIBC_2.40 __rseq_feature_size D 0x4 diff --git a/sysdeps/unix/sysv/linux/s390/s390-64/ld.abilist b/sysdeps/unix/sysv/linux/s390/s390-64/ld.abilist index 78d071600b..f5fbc6de43 100644 --- a/sysdeps/unix/sysv/linux/s390/s390-64/ld.abilist +++ b/sysdeps/unix/sysv/linux/s390/s390-64/ld.abilist @@ -6,3 +6,4 @@ GLIBC_2.34 __rtld_version_placeholder F GLIBC_2.35 __rseq_flags D 0x4 GLIBC_2.35 __rseq_offset D 0x8 GLIBC_2.35 __rseq_size D 0x4 +GLIBC_2.40 __rseq_feature_size D 0x4 diff --git a/sysdeps/unix/sysv/linux/sh/be/ld.abilist b/sysdeps/unix/sysv/linux/sh/be/ld.abilist index 7f5527fb30..1fb6c33c7b 100644 --- a/sysdeps/unix/sysv/linux/sh/be/ld.abilist +++ b/sysdeps/unix/sysv/linux/sh/be/ld.abilist @@ -6,4 +6,5 @@ GLIBC_2.34 __rtld_version_placeholder F GLIBC_2.35 __rseq_flags D 0x4 GLIBC_2.35 __rseq_offset D 0x4 GLIBC_2.35 __rseq_size D 0x4 +GLIBC_2.40 __rseq_feature_size D 0x4 GLIBC_2.4 __stack_chk_guard D 0x4 diff --git a/sysdeps/unix/sysv/linux/sh/le/ld.abilist b/sysdeps/unix/sysv/linux/sh/le/ld.abilist index 7f5527fb30..1fb6c33c7b 100644 --- a/sysdeps/unix/sysv/linux/sh/le/ld.abilist +++ b/sysdeps/unix/sysv/linux/sh/le/ld.abilist @@ -6,4 +6,5 @@ GLIBC_2.34 __rtld_version_placeholder F GLIBC_2.35 __rseq_flags D 0x4 GLIBC_2.35 __rseq_offset D 0x4 GLIBC_2.35 __rseq_size D 0x4 +GLIBC_2.40 __rseq_feature_size D 0x4 GLIBC_2.4 __stack_chk_guard D 0x4 diff --git a/sysdeps/unix/sysv/linux/sparc/sparc32/ld.abilist b/sysdeps/unix/sysv/linux/sparc/sparc32/ld.abilist index 3aac73f3df..df3f7fefb3 100644 --- a/sysdeps/unix/sysv/linux/sparc/sparc32/ld.abilist +++ b/sysdeps/unix/sysv/linux/sparc/sparc32/ld.abilist @@ -6,3 +6,4 @@ GLIBC_2.34 __rtld_version_placeholder F GLIBC_2.35 __rseq_flags D 0x4 GLIBC_2.35 __rseq_offset D 0x4 GLIBC_2.35 __rseq_size D 0x4 +GLIBC_2.40 __rseq_feature_size D 0x4 diff --git a/sysdeps/unix/sysv/linux/sparc/sparc64/ld.abilist b/sysdeps/unix/sysv/linux/sparc/sparc64/ld.abilist index 5471b24d59..3bf61e1210 100644 --- a/sysdeps/unix/sysv/linux/sparc/sparc64/ld.abilist +++ b/sysdeps/unix/sysv/linux/sparc/sparc64/ld.abilist @@ -6,3 +6,4 @@ GLIBC_2.34 __rtld_version_placeholder F GLIBC_2.35 __rseq_flags D 0x4 GLIBC_2.35 __rseq_offset D 0x8 GLIBC_2.35 __rseq_size D 0x4 +GLIBC_2.40 __rseq_feature_size D 0x4 diff --git a/sysdeps/unix/sysv/linux/sys/rseq.h b/sysdeps/unix/sysv/linux/sys/rseq.h index b8afab8945..a048ba8958 100644 --- a/sysdeps/unix/sysv/linux/sys/rseq.h +++ b/sysdeps/unix/sysv/linux/sys/rseq.h @@ -163,6 +163,10 @@ extern const ptrdiff_t __rseq_offset; unsuccessful. */ extern const unsigned int __rseq_size; +/* Size of the registered rseq features. 0 if the registration was + unsuccessful. */ +extern const unsigned int __rseq_feature_size; + /* Flags used during rseq registration. */ extern const unsigned int __rseq_flags; diff --git a/sysdeps/unix/sysv/linux/tst-rseq-disable.c b/sysdeps/unix/sysv/linux/tst-rseq-disable.c index ae4143916b..eb4b6278dc 100644 --- a/sysdeps/unix/sysv/linux/tst-rseq-disable.c +++ b/sysdeps/unix/sysv/linux/tst-rseq-disable.c @@ -39,6 +39,7 @@ check_rseq_disabled (void) TEST_COMPARE (__rseq_flags, 0); TEST_COMPARE (__rseq_size, 0); + TEST_COMPARE (__rseq_feature_size, 0); TEST_COMPARE ((int) rseq_area->cpu_id, RSEQ_CPU_ID_REGISTRATION_FAILED); TEST_COMPARE (sizeof (local_rseq), RSEQ_TEST_MIN_SIZE); diff --git a/sysdeps/unix/sysv/linux/tst-rseq.c b/sysdeps/unix/sysv/linux/tst-rseq.c index c8c0518a5d..c5d9afbb0a 100644 --- a/sysdeps/unix/sysv/linux/tst-rseq.c +++ b/sysdeps/unix/sysv/linux/tst-rseq.c @@ -38,12 +38,14 @@ static void do_rseq_main_test (void) { size_t rseq_align = MAX (getauxval (AT_RSEQ_ALIGN), RSEQ_TEST_MIN_ALIGN); - size_t rseq_size = roundup (MAX (getauxval (AT_RSEQ_FEATURE_SIZE), RSEQ_TEST_MIN_SIZE), rseq_align); + size_t rseq_feature_size = MAX (getauxval (AT_RSEQ_FEATURE_SIZE), RSEQ_TEST_MIN_FEATURE_SIZE); + size_t rseq_size = roundup (MAX (rseq_feature_size, RSEQ_TEST_MIN_SIZE), rseq_align); struct rseq *rseq = __thread_pointer () + __rseq_offset; TEST_VERIFY_EXIT (rseq_thread_registered ()); TEST_COMPARE (__rseq_flags, 0); TEST_COMPARE (__rseq_size, rseq_size); + TEST_COMPARE (__rseq_feature_size, rseq_feature_size); /* The size of the rseq area must be a multiple of the alignment. */ TEST_VERIFY ((__rseq_size % rseq_align) == 0); /* The rseq area address must be aligned. */ diff --git a/sysdeps/unix/sysv/linux/x86_64/64/ld.abilist b/sysdeps/unix/sysv/linux/x86_64/64/ld.abilist index 5a8bd322cd..25c2153c21 100644 --- a/sysdeps/unix/sysv/linux/x86_64/64/ld.abilist +++ b/sysdeps/unix/sysv/linux/x86_64/64/ld.abilist @@ -6,3 +6,4 @@ GLIBC_2.34 __rtld_version_placeholder F GLIBC_2.35 __rseq_flags D 0x4 GLIBC_2.35 __rseq_offset D 0x8 GLIBC_2.35 __rseq_size D 0x4 +GLIBC_2.40 __rseq_feature_size D 0x4 diff --git a/sysdeps/unix/sysv/linux/x86_64/x32/ld.abilist b/sysdeps/unix/sysv/linux/x86_64/x32/ld.abilist index e17496d124..05327004e2 100644 --- a/sysdeps/unix/sysv/linux/x86_64/x32/ld.abilist +++ b/sysdeps/unix/sysv/linux/x86_64/x32/ld.abilist @@ -6,3 +6,4 @@ GLIBC_2.34 __rtld_version_placeholder F GLIBC_2.35 __rseq_flags D 0x4 GLIBC_2.35 __rseq_offset D 0x4 GLIBC_2.35 __rseq_size D 0x4 +GLIBC_2.40 __rseq_feature_size D 0x4

[v7,3/8] nptl: Add public __rseq_feature_size symbol

Commit Message

Patch