1  /* Copyright (C) 2003-2023 Free Software Foundation, Inc.
       2     This file is part of the GNU C Library.
       3  
       4     The GNU C Library is free software; you can redistribute it and/or
       5     modify it under the terms of the GNU Lesser General Public
       6     License as published by the Free Software Foundation; either
       7     version 2.1 of the License, or (at your option) any later version.
       8  
       9     The GNU C Library is distributed in the hope that it will be useful,
      10     but WITHOUT ANY WARRANTY; without even the implied warranty of
      11     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      12     Lesser General Public License for more details.
      13  
      14     You should have received a copy of the GNU Lesser General Public
      15     License along with the GNU C Library; if not, see
      16     <https://www.gnu.org/licenses/>.  */
      17  
      18  #include <setjmp.h>
      19  #include <jmpbuf-offsets.h>
      20  #include <stdint.h>
      21  #include <unwind.h>
      22  #include <sysdep.h>
      23  #include <pointer_guard.h>
      24  
      25  /* Test if longjmp to JMPBUF would unwind the frame
      26     containing a local variable at ADDRESS.  */
      27  #define _JMPBUF_UNWINDS(jmpbuf, address, demangle) \
      28    ((int) (address) < demangle ((jmpbuf)[JB_SP]))
      29  
      30  #define _JMPBUF_CFA_UNWINDS_ADJ(_jmpbuf, _context, _adj) \
      31    _JMPBUF_UNWINDS_ADJ (_jmpbuf, (void *) _Unwind_GetCFA (_context), _adj)
      32  
      33  static inline uintptr_t __attribute__ ((unused))
      34  _jmpbuf_sp (__jmp_buf regs)
      35  {
      36    uintptr_t sp = regs[JB_SP];
      37    PTR_DEMANGLE (sp);
      38    return sp;
      39  }
      40  
      41  #define _JMPBUF_UNWINDS_ADJ(_jmpbuf, _address, _adj) \
      42    ((uintptr_t) (_address) - (_adj) < _jmpbuf_sp (_jmpbuf) - (_adj))
      43  
      44  /* We use the normal lobngjmp for unwinding.  */
      45  #define __libc_unwind_longjmp(buf, val) __libc_longjmp (buf, val)