nptl: Remove remnants of the libc/libpthread forwarder interface

All previously forwarded functions are now implemented in libc.

Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>

nptl/Makefile

@@ -38,7 +38,6 @@ routines = \
   elision-timed \
   elision-trylock \
   elision-unlock \
-  forward \
   futex-internal \
   libc-cancellation \
   libc-cleanup \

nptl/forward.c

@@ -1,31 +0,0 @@
-/* Copyright (C) 2002-2021 Free Software Foundation, Inc.
-   This file is part of the GNU C Library.
-   Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
-
-   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
-   <https://www.gnu.org/licenses/>.  */
-
-#include <dlfcn.h>
-#include <pthreadP.h>
-#include <signal.h>
-#include <stdlib.h>
-
-#include <shlib-compat.h>
-#include <atomic.h>
-#include <safe-fatal.h>
-
-
-/* Pointers to the libc functions.  */
-struct pthread_functions __libc_pthread_functions attribute_hidden;
-int __libc_pthread_functions_init attribute_hidden;

nptl/libc_pthread_init.c

@@ -35,38 +35,11 @@ extern int __libc_multiple_threads attribute_hidden;
 
 int *
 #endif
-__libc_pthread_init (void (*reclaim) (void),
+__libc_pthread_init (void (*reclaim) (void))
-		     const struct pthread_functions *functions)
 {
   /* Called by a child after fork.  */
   __register_atfork (NULL, NULL, reclaim, NULL);
 
-#ifdef SHARED
-  /* Copy the function pointers into an array in libc.  This enables
-     access with just one memory reference but moreso, it prevents
-     hijacking the function pointers with just one pointer change.  We
-     "encrypt" the function pointers since we cannot write-protect the
-     array easily enough.  */
-  union ptrhack
-  {
-    struct pthread_functions pf;
-# define NPTRS (sizeof (struct pthread_functions) / sizeof (void *))
-    void *parr[NPTRS];
-  } __attribute__ ((may_alias)) const *src;
-  union ptrhack *dest;
-
-  src = (const void *) functions;
-  dest = (void *) &__libc_pthread_functions;
-
-  for (size_t cnt = 0; cnt < NPTRS; ++cnt)
-    {
-      void *p = src->parr[cnt];
-      PTR_MANGLE (p);
-      dest->parr[cnt] = p;
-    }
-  __libc_pthread_functions_init = 1;
-#endif
-
 #ifndef TLS_MULTIPLE_THREADS_IN_TCB
   return &__libc_multiple_threads;
 #endif

nptl/nptl-init.c

@@ -49,15 +49,6 @@ size_t __static_tls_align_m1;
 /* Version of the library, used in libthread_db to detect mismatches.  */
 static const char nptl_version[] __attribute_used__ = VERSION;
 
-#ifdef SHARED
-static const struct pthread_functions pthread_functions =
-  {
-  };
-# define ptr_pthread_functions &pthread_functions
-#else
-# define ptr_pthread_functions NULL
-#endif
-
 /* For asynchronous cancellation we use a signal.  This is the handler.  */
 static void
 sigcancel_handler (int sig, siginfo_t *si, void *ctx)
@@ -206,7 +197,7 @@ __pthread_initialize_minimal_internal (void)
 #ifndef TLS_MULTIPLE_THREADS_IN_TCB
   __libc_multiple_threads_ptr =
 #endif
-    __libc_pthread_init (__reclaim_stacks, ptr_pthread_functions);
+    __libc_pthread_init (__reclaim_stacks);
 }
 strong_alias (__pthread_initialize_minimal_internal,
 	      __pthread_initialize_minimal)

nptl/pthreadP.h

@@ -30,7 +30,6 @@
 #include <lowlevellock.h>
 #include <stackinfo.h>
 #include <internaltypes.h>
-#include <pthread-functions.h>
 #include <atomic.h>
 #include <kernel-features.h>
 #include <errno.h>
@@ -370,11 +369,9 @@ extern unsigned long int *__fork_generation_pointer attribute_hidden;
 
 /* Register the generation counter in the libpthread with the libc.  */
 #ifdef TLS_MULTIPLE_THREADS_IN_TCB
-extern void __libc_pthread_init (void (*reclaim) (void),
+extern void __libc_pthread_init (void (*reclaim) (void));
-				 const struct pthread_functions *functions);
 #else
-extern int *__libc_pthread_init (void (*reclaim) (void),
+extern int *__libc_pthread_init (void (*reclaim) (void));
-				 const struct pthread_functions *functions);
 
 /* Variable set to a nonzero value either if more than one thread runs or ran,
    or if a single-threaded process is trying to cancel itself.  See

sysdeps/nptl/libc-lockP.h

@@ -32,7 +32,6 @@
    ld.so might be used on old kernels with a different libc.so.  */
 #include <lowlevellock.h>
 #include <tls.h>
-#include <pthread-functions.h>
 
 #if IS_IN (libpthread)
 /* This gets us the declarations of the __pthread_* internal names,
@@ -100,27 +99,12 @@ _Static_assert (LLL_LOCK_INITIALIZER == 0, "LLL_LOCK_INITIALIZER != 0");
   (FUNC != NULL ? FUNC ARGS : ELSE)
 #endif
 
-/* Call thread functions through the function pointer table.  */
+/* All previously forwarded functions are now called directly (either
-#if defined SHARED && IS_IN (libc)
+   via local call in libc, or through a __export), but __libc_ptf_call
-# define PTFAVAIL(NAME) __libc_pthread_functions_init
+   is still used in generic code shared with Hurd.  */
-# define __libc_ptf_call(FUNC, ARGS, ELSE) \
+#define PTFAVAIL(NAME) 1
-  (__libc_pthread_functions_init ? PTHFCT_CALL (ptr_##FUNC, ARGS) : ELSE)
+#define __libc_ptf_call(FUNC, ARGS, ELSE) FUNC ARGS
-# define __libc_ptf_call_always(FUNC, ARGS) \
+#define __libc_ptf_call_always(FUNC, ARGS) FUNC ARGS
-  PTHFCT_CALL (ptr_##FUNC, ARGS)
-#elif IS_IN (libpthread)
-# define PTFAVAIL(NAME) 1
-# define __libc_ptf_call(FUNC, ARGS, ELSE) \
-  FUNC ARGS
-# define __libc_ptf_call_always(FUNC, ARGS) \
-  FUNC ARGS
-#else
-# define PTFAVAIL(NAME) (NAME != NULL)
-# define __libc_ptf_call(FUNC, ARGS, ELSE) \
-  __libc_maybe_call (FUNC, ARGS, ELSE)
-# define __libc_ptf_call_always(FUNC, ARGS) \
-  FUNC ARGS
-#endif
-
 
 /* Initialize the named lock variable, leaving it in a consistent, unlocked
    state.  */

sysdeps/nptl/pthread-functions.h

@@ -1,50 +0,0 @@
-/* Copyright (C) 2003-2021 Free Software Foundation, Inc.
-   This file is part of the GNU C Library.
-   Contributed by Ulrich Drepper <drepper@redhat.com>, 2003.
-
-   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
-   <https://www.gnu.org/licenses/>.  */
-
-#ifndef _PTHREAD_FUNCTIONS_H
-#define _PTHREAD_FUNCTIONS_H	1
-
-#include <pthread.h>
-#include <setjmp.h>
-#include <internaltypes.h>
-#include <sysdep.h>
-
-struct xid_command;
-
-/* Data type shared with libc.  The libc uses it to pass on calls to
-   the thread functions.  */
-struct pthread_functions
-{
-};
-
-/* Variable in libc.so.  */
-extern struct pthread_functions __libc_pthread_functions attribute_hidden;
-extern int __libc_pthread_functions_init attribute_hidden;
-
-#ifdef PTR_DEMANGLE
-# define PTHFCT_CALL(fct, params) \
-  ({ __typeof (__libc_pthread_functions.fct) __p;			      \
-     __p = __libc_pthread_functions.fct;				      \
-     PTR_DEMANGLE (__p);						      \
-     __p params; })
-#else
-# define PTHFCT_CALL(fct, params) \
-  __libc_pthread_functions.fct params
-#endif
-
-#endif	/* pthread-functions.h */