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124 lines
3.9 KiB
C
124 lines
3.9 KiB
C
/* Copyright (C) 2003 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Ulrich Drepper <drepper@redhat.com>
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and Richard Henderson <rth@redhat.com>, 2003.
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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 <setjmp.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include "pthreadP.h"
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#ifdef HAVE_FORCED_UNWIND
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static _Unwind_Reason_Code
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unwind_stop (int version, _Unwind_Action actions,
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_Unwind_Exception_Class exc_class,
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struct _Unwind_Exception *exc_obj,
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struct _Unwind_Context *context, void *stop_parameter)
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{
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struct pthread_unwind_buf *buf = stop_parameter;
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/* Do longjmp if we're at "end of stack", aka "end of unwind data".
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We assume there are only C frame without unwind data in between
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here and the jmp_buf target. Otherwise simply note that the CFA
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of a function is NOT within it's stack frame; it's the SP of the
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previous frame. */
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if ((actions & _UA_END_OF_STACK)
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|| ! _JMPBUF_UNWINDS (buf->cancel_jmp_buf[0].jmp_buf,
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_Unwind_GetCFA (context)))
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__libc_longjmp ((struct __jmp_buf_tag *) buf->cancel_jmp_buf, 1);
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return _URC_NO_REASON;
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}
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static void
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unwind_cleanup (_Unwind_Reason_Code reason, struct _Unwind_Exception *exc)
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{
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/* When we get here a C++ catch block didn't rethrow the object. We
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cannot handle this case and therefore abort. */
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# define STR_N_LEN(str) str, strlen (str)
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INTERNAL_SYSCALL_DECL (err);
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INTERNAL_SYSCALL (write, err, 3, STDERR_FILENO,
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STR_N_LEN ("FATAL: exception not rethrown\n"));
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abort ();
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}
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#endif /* have forced unwind */
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void
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__cleanup_fct_attribute __attribute ((noreturn))
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__pthread_unwind (__pthread_unwind_buf_t *buf)
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{
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struct pthread_unwind_buf *ibuf = (struct pthread_unwind_buf *) buf;
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struct pthread *self = THREAD_SELF;
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/* Handle the compatibility stuff first. Execute all handlers
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registered with the old method. We don't execute them in order,
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instead, they will run first. */
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struct _pthread_cleanup_buffer *oldp = ibuf->priv.data.cleanup;
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struct _pthread_cleanup_buffer *curp = THREAD_GETMEM (self, cleanup);
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if (curp != oldp)
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{
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do
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{
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/* Pointer to the next element. */
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struct _pthread_cleanup_buffer *nextp = curp->__prev;
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/* Call the handler. */
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curp->__routine (curp->__arg);
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/* To the next. */
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curp = nextp;
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}
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while (curp != oldp);
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/* Mark the current element as handled. */
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THREAD_SETMEM (self, cleanup, curp);
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}
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#ifdef HAVE_FORCED_UNWIND
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/* This is not a catchable exception, so don't provide any details about
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the exception type. We do need to initialize the field though. */
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THREAD_SETMEM (self, exc.exception_class, 0);
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THREAD_SETMEM (self, exc.exception_cleanup, unwind_cleanup);
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_Unwind_ForcedUnwind (&self->exc, unwind_stop, ibuf);
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#else
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/* We simply jump to the registered setjmp buffer. */
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__libc_longjmp ((struct __jmp_buf_tag *) ibuf->cancel_jmp_buf, 1);
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#endif
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/* NOTREACHED */
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/* We better do not get here. */
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abort ();
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}
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void
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__cleanup_fct_attribute __attribute ((noreturn))
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__pthread_unwind_next (__pthread_unwind_buf_t *buf)
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{
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struct pthread_unwind_buf *ibuf = (struct pthread_unwind_buf *) buf;
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__pthread_unwind (ibuf->priv.data.prev);
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}
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