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[thirdparty/glibc.git] / sysdeps / x86_64 / jmpbuf-unwind.h

/* Copyright (C) 2003-2023 Free Software Foundation, Inc.
   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library; if not, see
   <https://www.gnu.org/licenses/>.  */

#include <setjmp.h>
#include <jmpbuf-offsets.h>
#include <stdint.h>
#include <unwind.h>
#include <sysdep.h>
#include <pointer_guard.h>

/* Test if longjmp to JMPBUF would unwind the frame
   containing a local variable at ADDRESS.  */
#define _JMPBUF_UNWINDS(jmpbuf, address, demangle) \
  ((void *) (address) < (void *) demangle ((jmpbuf)[JB_RSP]))

#define _JMPBUF_CFA_UNWINDS_ADJ(_jmpbuf, _context, _adj) \
  _JMPBUF_UNWINDS_ADJ (_jmpbuf, \
		       (void *) (_Unwind_Ptr) _Unwind_GetCFA (_context), \
		       _adj)

static inline uintptr_t __attribute__ ((unused))
_jmpbuf_sp (__jmp_buf regs)
{
  uintptr_t sp = regs[JB_RSP];
  PTR_DEMANGLE (sp);
  return sp;
}

#define _JMPBUF_UNWINDS_ADJ(_jmpbuf, _address, _adj) \
  ((uintptr_t) (_address) - (_adj) < _jmpbuf_sp (_jmpbuf) - (_adj))

/* We use the normal longjmp for unwinding.  */
#define __libc_unwind_longjmp(buf, val) __libc_longjmp (buf, val)