mirror of git://sourceware.org/git/glibc.git
53 lines
2.1 KiB
C
53 lines
2.1 KiB
C
/* Copyright (C) 2008 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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#include_next <aio_misc.h>
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#ifdef __thumb2__
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#include <errno.h>
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/* The Thumb-2 definition of INTERNAL_SYSCALL_RAW has to hide the use
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of r7 from the compiler because it cannot handle asm clobbering the
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hard frame pointer. In aio_suspend, GCC does not eliminate the
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hard frame pointer because the function uses variable-length
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arrays, so it generates unwind information using r7 as virtual
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stack pointer. During system calls, when r7 has been saved on the
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stack, this means the unwind information is invalid. Without extra
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unwind directives, which would need to cause unwind information for
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the asm to be generated separately from that for the parts of the
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function before and after the asm (with three index table entries),
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it is not possible to represent any temporary change to the virtual
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stack pointer. Instead, we move the problematic system calls out
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of line into a function that does not require a frame pointer. */
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static __attribute_noinline__ void
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aio_misc_wait (int *resultp,
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volatile int *futexp,
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const struct timespec *timeout,
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int cancel)
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{
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AIO_MISC_WAIT (*resultp, *futexp, timeout, cancel);
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}
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#undef AIO_MISC_WAIT
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#define AIO_MISC_WAIT(result, futex, timeout, cancel) \
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aio_misc_wait (&result, &futex, timeout, cancel)
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#endif
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