sysdeps/arm/jmpbuf-unwind.h

   1 /* Copyright (C) 2005-2023 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 <stdint.h>
  20 #include <sysdep.h>
  21 #include <pointer_guard.h>
  22 #include <unwind.h>
  23
  24 /* Test if longjmp to JMPBUF would unwind the frame
  25    containing a local variable at ADDRESS.  */
  26 #define _JMPBUF_UNWINDS(jmpbuf, address, demangle) \
  27   ((void *) (address) < (void *) demangle (jmpbuf[__JMP_BUF_SP]))
  28
  29 #define _JMPBUF_CFA_UNWINDS_ADJ(_jmpbuf, _context, _adj) \
  30   _JMPBUF_UNWINDS_ADJ (_jmpbuf, (void *) _Unwind_GetCFA (_context), _adj)
  31
  32 static inline uintptr_t __attribute__ ((unused))
  33 _jmpbuf_sp (__jmp_buf regs)
  34 {
  35   uintptr_t sp = regs[__JMP_BUF_SP];
  36   PTR_DEMANGLE (sp);
  37   return sp;
  38 }
  39
  40 #define _JMPBUF_UNWINDS_ADJ(_jmpbuf, _address, _adj) \
  41   ((uintptr_t) (_address) - (_adj) < _jmpbuf_sp (_jmpbuf) - (_adj))
  42
  43 /* We use the normal longjmp for unwinding.  */
  44 #define __libc_unwind_longjmp(buf, val) __libc_longjmp (buf, val)