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80 lines
2.7 KiB
C
80 lines
2.7 KiB
C
/* _longjmp_unwind -- Clean up stack frames unwound by longjmp. Hurd version.
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Copyright (C) 1995-2019 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, see
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<http://www.gnu.org/licenses/>. */
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#include <jmpbuf-unwind.h>
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#include <hurd/userlink.h>
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#include <hurd/signal.h>
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#include <hurd/sigpreempt.h>
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#include <assert.h>
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#include <stdint.h>
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#ifndef _JMPBUF_UNWINDS
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#error "<jmpbuf-unwind.h> fails to define _JMPBUF_UNWINDS"
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#endif
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static inline uintptr_t
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demangle_ptr (uintptr_t x)
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{
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# ifdef PTR_DEMANGLE
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PTR_DEMANGLE (x);
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# endif
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return x;
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}
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/* This function is called by `longjmp' (with its arguments) to restore
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active resources to a sane state before the frames code using them are
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jumped out of. */
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void
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_longjmp_unwind (jmp_buf env, int val)
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{
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struct hurd_sigstate *ss = _hurd_self_sigstate ();
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struct hurd_userlink *link;
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/* All access to SS->active_resources must take place inside a critical
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section where signal handlers cannot run. */
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__spin_lock (&ss->lock);
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assert (! __spin_lock_locked (&ss->critical_section_lock));
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__spin_lock (&ss->critical_section_lock);
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/* Remove local signal preemptors being unwound past. */
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while (ss->preemptors &&
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_JMPBUF_UNWINDS (env[0].__jmpbuf, ss->preemptors, demangle_ptr))
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ss->preemptors = ss->preemptors->next;
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__spin_unlock (&ss->lock);
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/* Iterate over the current thread's list of active resources.
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Process the head portion of the list whose links reside
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in stack frames being unwound by this jump. */
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for (link = ss->active_resources;
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link && _JMPBUF_UNWINDS (env[0].__jmpbuf, link, demangle_ptr);
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link = link->thread.next)
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/* Remove this link from the resource's users list,
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since the frame using the resource is being unwound.
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This call returns nonzero if that was the last user. */
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if (_hurd_userlink_unlink (link))
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/* One of the frames being unwound by the longjmp was the last user
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of its resource. Call the cleanup function to deallocate it. */
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(*link->cleanup) (link->cleanup_data, env, val);
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_hurd_critical_section_unlock (ss);
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}
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