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| author | Florian Weimer <fweimer@redhat.com> | 2021-12-28 22:52:56 +0100 |
|---|---|---|
| committer | Florian Weimer <fweimer@redhat.com> | 2021-12-28 22:52:56 +0100 |
| commit | 5d28a8962dcb6ec056b81d730e3c6fb57185a210 (patch) | |
| tree | 3d714aaef575deba322fa5a1e29c76c6f96dc850 /sysdeps/unix/sysv/linux/riscv | |
| parent | 83b8d5027d2f80c4603cd706da95d6c9a09a4e16 (diff) | |
| download | glibc-5d28a8962dcb6ec056b81d730e3c6fb57185a210.zip glibc-5d28a8962dcb6ec056b81d730e3c6fb57185a210.tar.gz glibc-5d28a8962dcb6ec056b81d730e3c6fb57185a210.tar.bz2 | |
elf: Add _dl_find_object function
It can be used to speed up the libgcc unwinder, and the internal
_dl_find_dso_for_object function (which is used for caller
identification in dlopen and related functions, and in dladdr).
_dl_find_object is in the internal namespace due to bug 28503.
If libgcc switches to _dl_find_object, this namespace issue will
be fixed. It is located in libc for two reasons: it is necessary
to forward the call to the static libc after static dlopen, and
there is a link ordering issue with -static-libgcc and libgcc_eh.a
because libc.so is not a linker script that includes ld.so in the
glibc build tree (so that GCC's internal -lc after libgcc_eh.a does
not pick up ld.so).
It is necessary to do the i386 customization in the
sysdeps/x86/bits/dl_find_object.h header shared with x86-64 because
otherwise, multilib installations are broken.
The implementation uses software transactional memory, as suggested
by Torvald Riegel. Two copies of the supporting data structures are
used, also achieving full async-signal-safety.
Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
Diffstat (limited to 'sysdeps/unix/sysv/linux/riscv')
| -rw-r--r-- | sysdeps/unix/sysv/linux/riscv/rv32/libc.abilist | 1 | ||||
| -rw-r--r-- | sysdeps/unix/sysv/linux/riscv/rv64/libc.abilist | 1 |
2 files changed, 2 insertions, 0 deletions
diff --git a/sysdeps/unix/sysv/linux/riscv/rv32/libc.abilist b/sysdeps/unix/sysv/linux/riscv/rv32/libc.abilist index 05df4d1..d292476 100644 --- a/sysdeps/unix/sysv/linux/riscv/rv32/libc.abilist +++ b/sysdeps/unix/sysv/linux/riscv/rv32/libc.abilist @@ -2376,3 +2376,4 @@ GLIBC_2.34 tss_delete F GLIBC_2.34 tss_get F GLIBC_2.34 tss_set F GLIBC_2.35 __memcmpeq F +GLIBC_2.35 _dl_find_object F diff --git a/sysdeps/unix/sysv/linux/riscv/rv64/libc.abilist b/sysdeps/unix/sysv/linux/riscv/rv64/libc.abilist index 8e349cb..b770e05 100644 --- a/sysdeps/unix/sysv/linux/riscv/rv64/libc.abilist +++ b/sysdeps/unix/sysv/linux/riscv/rv64/libc.abilist @@ -2576,3 +2576,4 @@ GLIBC_2.34 tss_delete F GLIBC_2.34 tss_get F GLIBC_2.34 tss_set F GLIBC_2.35 __memcmpeq F +GLIBC_2.35 _dl_find_object F |