nptl: Move __pthread_cleanup_upto into libc

This internal symbol is used as part of the longjmp implementation.
Rename the file from nptl/pt-cleanup.c to nptl/pthread_cleanup_upto.c
so that the pt-* files remain restricted to libpthread.

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

1 files changed, 62 insertions, 0 deletions

diff --git a/nptl/pthread_cleanup_upto.c b/nptl/pthread_cleanup_upto.c
new file mode 100644
index 0000000000..89da3e5229
--- /dev/null
+++ b/nptl/pthread_cleanup_upto.c
@@ -0,0 +1,62 @@
+/* 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 <setjmp.h>
+#include <stdlib.h>
+#include "pthreadP.h"
+#include <jmpbuf-unwind.h>
+
+void
+__pthread_cleanup_upto (__jmp_buf target, char *targetframe)
+{
+  struct pthread *self = THREAD_SELF;
+  struct _pthread_cleanup_buffer *cbuf;
+
+  /* Adjust all pointers used in comparisons, so that top of thread's
+     stack is at the top of address space.  Without that, things break
+     if stack is allocated above the main stack.  */
+  uintptr_t adj = (uintptr_t) self->stackblock + self->stackblock_size;
+  uintptr_t targetframe_adj = (uintptr_t) targetframe - adj;
+
+  for (cbuf = THREAD_GETMEM (self, cleanup);
+       cbuf != NULL && _JMPBUF_UNWINDS_ADJ (target, cbuf, adj);
+       cbuf = cbuf->__prev)
+    {
+#if _STACK_GROWS_DOWN
+      if ((uintptr_t) cbuf - adj <= targetframe_adj)
+        {
+          cbuf = NULL;
+          break;
+        }
+#elif _STACK_GROWS_UP
+      if ((uintptr_t) cbuf - adj >= targetframe_adj)
+        {
+          cbuf = NULL;
+          break;
+        }
+#else
+# error "Define either _STACK_GROWS_DOWN or _STACK_GROWS_UP"
+#endif
+
+      /* Call the cleanup code.  */
+      cbuf->__routine (cbuf->__arg);
+    }
+
+  THREAD_SETMEM (self, cleanup, cbuf);
+}
+libc_hidden_def (__pthread_cleanup_upto)