1  /* Examine __jmp_buf for unwinding frames.  ARC version.
       2     Copyright (C) 2020-2023 Free Software Foundation, Inc.
       3     This file is part of the GNU C Library.
       4  
       5     The GNU C Library is free software; you can redistribute it and/or
       6     modify it under the terms of the GNU Lesser General Public
       7     License as published by the Free Software Foundation; either
       8     version 2.1 of the License, or (at your option) any later version.
       9  
      10     The GNU C Library is distributed in the hope that it will be useful,
      11     but WITHOUT ANY WARRANTY; without even the implied warranty of
      12     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      13     Lesser General Public License for more details.
      14  
      15     You should have received a copy of the GNU Lesser General Public
      16     License along with the GNU C Library.  If not, see
      17     <https://www.gnu.org/licenses/>.  */
      18  
      19  #include <setjmp.h>
      20  #include <jmpbuf-offsets.h>
      21  #include <stdint.h>
      22  #include <unwind.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  
      28  #define _JMPBUF_UNWINDS(jmpbuf, address, demangle) \
      29    ((void *) (address) < (void *) demangle (jmpbuf[JB_SP]))
      30  
      31  #define _JMPBUF_CFA_UNWINDS_ADJ(_jmpbuf, _context, _adj) \
      32    _JMPBUF_UNWINDS_ADJ (_jmpbuf, (void *) _Unwind_GetCFA (_context), _adj)
      33  
      34  static inline uintptr_t __attribute__ ((unused))
      35  _jmpbuf_sp (__jmp_buf jmpbuf)
      36  {
      37    uintptr_t sp = jmpbuf[JB_SP];
      38    PTR_DEMANGLE (sp);
      39    return sp;
      40  }
      41  
      42  #define _JMPBUF_UNWINDS_ADJ(_jmpbuf, _address, _adj) \
      43    ((uintptr_t) (_address) - (_adj) < (uintptr_t) (_jmpbuf_sp (_jmpbuf) - (_adj)))
      44  
      45  /* We use the normal longjmp for unwinding.  */
      46  #define __libc_unwind_longjmp(buf, val) __libc_longjmp (buf, val)