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nptl: Move stack list variables into _rtld_global

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Now __thread_gscope_wait (the function behind THREAD_GSCOPE_WAIT,
formerly __wait_lookup_done) can be implemented directly in ld.so,
eliminating the unprotected GL (dl_wait_lookup_done) function
pointer.

Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>
This commit is contained in:
Florian Weimer
2020-11-16 19:33:30 +01:00
parent aac0f62c47
commit 1daccf403b
37 changed files with 243 additions and 184 deletions
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12
elf/rtld.c
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@ -48,6 +48,7 @@
#include <array_length.h>
#include <libc-early-init.h>
#include <dl-main.h>
#include <list.h>
#include <assert.h>
@ -799,6 +800,9 @@ cannot allocate TLS data structures for initial thread\n");
const char *lossage = TLS_INIT_TP (tcbp);
if (__glibc_unlikely (lossage != NULL))
_dl_fatal_printf ("cannot set up thread-local storage: %s\n", lossage);
#if THREAD_GSCOPE_IN_TCB
list_add (&THREAD_SELF->list, &GL (dl_stack_user));
#endif
tls_init_tp_called = true;
return tcbp;
@ -1139,6 +1143,11 @@ dl_main (const ElfW(Phdr) *phdr,
GL(dl_rtld_unlock_recursive) = rtld_lock_default_unlock_recursive;
#endif
#if THREAD_GSCOPE_IN_TCB
INIT_LIST_HEAD (&GL (dl_stack_used));
INIT_LIST_HEAD (&GL (dl_stack_user));
#endif
/* The explicit initialization here is cheaper than processing the reloc
in the _rtld_local definition's initializer. */
GL(dl_make_stack_executable_hook) = &_dl_make_stack_executable;
@ -2383,6 +2392,9 @@ dl_main (const ElfW(Phdr) *phdr,
if (__glibc_unlikely (lossage != NULL))
_dl_fatal_printf ("cannot set up thread-local storage: %s\n",
lossage);
#if THREAD_GSCOPE_IN_TCB
list_add (&THREAD_SELF->list, &GL (dl_stack_user));
#endif
}
/* Make sure no new search directories have been added. */