sysdeps/x86_64/jmpbuf-unwind.h

   1 /* Copyright (C) 2003-2024 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   ((void *) (address) < (void *) demangle ((jmpbuf)[JB_RSP]))
  29
  30 #define _JMPBUF_CFA_UNWINDS_ADJ(_jmpbuf, _context, _adj) \
  31   _JMPBUF_UNWINDS_ADJ (_jmpbuf, \
  32                        (void *) (_Unwind_Ptr) _Unwind_GetCFA (_context), \
  33                        _adj)
  34
  35 static inline uintptr_t __attribute__ ((unused))
  36 _jmpbuf_sp (__jmp_buf regs)
  37 {
  38   uintptr_t sp = regs[JB_RSP];
  39   PTR_DEMANGLE (sp);
  40   return sp;
  41 }
  42
  43 #define _JMPBUF_UNWINDS_ADJ(_jmpbuf, _address, _adj) \
  44   ((uintptr_t) (_address) - (_adj) < _jmpbuf_sp (_jmpbuf) - (_adj))
  45
  46 /* We use the normal longjmp for unwinding.  */
  47 #define __libc_unwind_longjmp(buf, val) __libc_longjmp (buf, val)