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glibc  2.9
jmpbuf-unwind.h
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00001 /* Copyright (C) 2003, 2004, 2006 Free Software Foundation, Inc.
00002    This file is part of the GNU C Library.
00003    Contributed by Jakub Jelinek <jakub@redhat.com>, 2003.
00004 
00005    The GNU C Library is free software; you can redistribute it and/or
00006    modify it under the terms of the GNU Lesser General Public
00007    License as published by the Free Software Foundation; either
00008    version 2.1 of the License, or (at your option) any later version.
00009 
00010    The GNU C Library is distributed in the hope that it will be useful,
00011    but WITHOUT ANY WARRANTY; without even the implied warranty of
00012    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00013    Lesser General Public License for more details.
00014 
00015    You should have received a copy of the GNU Lesser General Public
00016    License along with the GNU C Library; if not, write to the Free
00017    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
00018    02111-1307 USA.  */
00019 
00020 #include <setjmp.h>
00021 #include <stdint.h>
00022 #include <unwind.h>
00023 
00024 /* Test if longjmp to JMPBUF would unwind the frame containing a local
00025    variable at ADDRESS.  */
00026 #define _JMPBUF_UNWINDS(_jmpbuf, _address, _demangle) \
00027   ((void *) (_address) < (void *) (((long int *) _jmpbuf)[0]))
00028 
00029 #define _JMPBUF_CFA_UNWINDS_ADJ(_jmpbuf, _context, _adj) \
00030   ({ uintptr_t _cfa = (uintptr_t) _Unwind_GetCFA (_context) - (_adj); \
00031      (_cfa < (uintptr_t)(((long *)(_jmpbuf))[0]) - (_adj)             \
00032       || (_cfa == (uintptr_t)(((long *)(_jmpbuf))[0]) - (_adj)        \
00033          && (uintptr_t) _Unwind_GetBSP (_context) - (_adj)            \
00034             >= (uintptr_t)(((long *)(_jmpbuf))[17]) - (_adj)));       \
00035   })
00036 
00037 #define _JMPBUF_UNWINDS_ADJ(_jmpbuf, _address, _adj) \
00038   ((uintptr_t)(_address) - (_adj) < (uintptr_t)(((long *)_jmpbuf)[0]) - (_adj))
00039 
00040 /* We use a longjmp() which can cross from the alternate signal-stack
00041    to the normal stack.  */
00042 extern void __libc_unwind_longjmp (sigjmp_buf env, int val)
00043           __attribute__ ((noreturn));
00044 hidden_proto (__libc_unwind_longjmp)