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When glibc is built as a shared library, TLS is always initialized by the call of TLS_INIT_TP () macro made inside the dynamic loader, prior to running the main program (see dl-call_tls_init_tp.h). We can take advantage of this: we know for sure that __LIBC_NO_TLS () will evaluate to 0 in all other cases, so let the compiler know that explicitly too. Also, only define _hurd_tls_init () and TLS_INIT_TP () under the same conditions (either !SHARED or inside rtld), to statically assert that this is the case. Other than a microoptimization, this also helps with avoiding awkward sharing of the __libc_tls_initialized variable between ld.so and libc.so that we would have to do otherwise -- we know for sure that no sharing is required, simply because __libc_tls_initialized would always be set to true inside libc.so. Signed-off-by: Sergey Bugaev <bugaevc@gmail.com> Message-Id: <20230319151017.531737-25-bugaevc@gmail.com> |
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| .. | ||
| bits | ||
| htl | ||
| ____longjmp_chk.S | ||
| __longjmp.S | ||
| c++-types.data | ||
| dl-tls-initialized.c | ||
| getcontext.S | ||
| Implies | ||
| intr-msg.h | ||
| ld.abilist | ||
| libanl.abilist | ||
| libBrokenLocale.abilist | ||
| libc_malloc_debug.abilist | ||
| libc.abilist | ||
| libcrypt.abilist | ||
| libdl.abilist | ||
| libm.abilist | ||
| libnsl.abilist | ||
| libpthread.abilist | ||
| libresolv.abilist | ||
| librt.abilist | ||
| libutil.abilist | ||
| localplt.data | ||
| longjmp-ts.c | ||
| makecontext.S | ||
| Makefile | ||
| setcontext.S | ||
| sigcontextinfo.h | ||
| sigreturn.c | ||
| static-start.S | ||
| swapcontext.S | ||
| tls.h | ||
| tlsdesc.sym | ||
| ucontext_i.sym | ||
| Versions | ||
| vm_param.h | ||