* sysdeps/unix/sysv/linux/arm/eabi/nptl/aio_misc.h: New.

git-svn-id: svn://svn.eglibc.org/branches/eglibc-2_9@7430 7b3dc134-2b1b-0410-93df-9e9f96275f8d

2 files changed, 56 insertions, 0 deletions

diff --git a/ports/ChangeLog.eglibc b/ports/ChangeLog.eglibc
index f021b82cc..09439f5ef 100644
--- a/ports/ChangeLog.eglibc
+++ b/ports/ChangeLog.eglibc
@@ -1,3 +1,7 @@
+2008-11-27  Joseph Myers  <joseph@codesourcery.com>
+
+	* sysdeps/unix/sysv/linux/arm/eabi/nptl/aio_misc.h: New.
+
 2008-11-25  Joseph Myers  <joseph@codesourcery.com>
 
 	* sysdeps/unix/sysv/linux/arm/sysdep.h (LOAD_ARGS_1, LOAD_ARGS_2,
diff --git a/ports/sysdeps/unix/sysv/linux/arm/eabi/nptl/aio_misc.h b/ports/sysdeps/unix/sysv/linux/arm/eabi/nptl/aio_misc.h
new file mode 100644
index 000000000..3fb1ec95f
--- /dev/null
+++ b/ports/sysdeps/unix/sysv/linux/arm/eabi/nptl/aio_misc.h
@@ -0,0 +1,52 @@
+/* Copyright (C) 2008 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   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, write to the Free
+   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+   02111-1307 USA.  */
+
+#include_next <aio_misc.h>
+
+#ifdef __thumb2__
+
+#include <errno.h>
+
+/* The Thumb-2 definition of INTERNAL_SYSCALL_RAW has to hide the use
+   of r7 from the compiler because it cannot handle asm clobbering the
+   hard frame pointer.  In aio_suspend, GCC does not eliminate the
+   hard frame pointer because the function uses variable-length
+   arrays, so it generates unwind information using r7 as virtual
+   stack pointer.  During system calls, when r7 has been saved on the
+   stack, this means the unwind information is invalid.  Without extra
+   unwind directives, which would need to cause unwind information for
+   the asm to be generated separately from that for the parts of the
+   function before and after the asm (with three index table entries),
+   it is not possible to represent any temporary change to the virtual
+   stack pointer.  Instead, we move the problematic system calls out
+   of line into a function that does not require a frame pointer.  */
+
+static __attribute_noinline__ void
+aio_misc_wait (int *resultp,
+	       volatile int *futexp,
+	       const struct timespec *timeout,
+	       int cancel)
+{
+  AIO_MISC_WAIT (*resultp, *futexp, timeout, cancel);
+}
+
+#undef AIO_MISC_WAIT
+#define AIO_MISC_WAIT(result, futex, timeout, cancel)	\
+  aio_misc_wait (&result, &futex, timeout, cancel)
+
+#endif