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glibc  2.9
jmpbuf-unwind.h
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00001 /* Copyright (C) 2003, 2005, 2006 Free Software Foundation, Inc.
00002    This file is part of the GNU C Library.
00003 
00004    The GNU C Library is free software; you can redistribute it and/or
00005    modify it under the terms of the GNU Lesser General Public
00006    License as published by the Free Software Foundation; either
00007    version 2.1 of the License, or (at your option) any later version.
00008 
00009    The GNU C Library is distributed in the hope that it will be useful,
00010    but WITHOUT ANY WARRANTY; without even the implied warranty of
00011    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00012    Lesser General Public License for more details.
00013 
00014    You should have received a copy of the GNU Lesser General Public
00015    License along with the GNU C Library; if not, write to the Free
00016    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
00017    02111-1307 USA.  */
00018 
00019 #include <setjmp.h>
00020 #include <stdint.h>
00021 #include <unwind.h>
00022 #include <sysdep.h>
00023 
00024 /* Test if longjmp to JMPBUF would unwind the frame
00025    containing a local variable at ADDRESS.  */
00026 #define _JMPBUF_UNWINDS(jmpbuf, address, demangle)             \
00027   ((void *) (address) < (void *) demangle ((jmpbuf)[0].__sp))
00028 
00029 #define _JMPBUF_CFA_UNWINDS_ADJ(_jmpbuf, _context, _adj) \
00030   _JMPBUF_UNWINDS_ADJ (_jmpbuf, (void *) _Unwind_GetCFA (_context), _adj)
00031 
00032 static inline uintptr_t __attribute__ ((unused))
00033 _jmpbuf_sp (__jmp_buf regs)
00034 {
00035   uintptr_t sp = regs[0].__sp;
00036 #ifdef PTR_DEMANGLE
00037   PTR_DEMANGLE (sp);
00038 #endif
00039   return sp;
00040 }
00041 
00042 #define _JMPBUF_UNWINDS_ADJ(_jmpbuf, _address, _adj) \
00043   ((uintptr_t) (_address) - (_adj) < _jmpbuf_sp (_jmpbuf) - (_adj))
00044 
00045 /* We use the normal longjmp for unwinding.  */
00046 #define __libc_unwind_longjmp(buf, val) __libc_longjmp (buf, val)