glibc/sysdeps/s390/jmpbuf-unwind.h

/* Copyright (C) 2003-2024 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 <bits/wordsize.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)->__gregs[__JB_GPR15]))


/* On s390{,x}, CFA is always 96 (resp. 160) bytes above actual
   %r15.  */
#define _JMPBUF_CFA_UNWINDS_ADJ(_jmpbuf, _context, _adj) \
  _JMPBUF_UNWINDS_ADJ (_jmpbuf,					\
		       (void *) (_Unwind_GetCFA (_context)	\
				 - 32 - 2 * __WORDSIZE), _adj)

static inline uintptr_t __attribute__ ((unused))
_jmpbuf_sp (__jmp_buf regs)
{
  void *sp = (void *) (uintptr_t) regs[0].__gregs[__JB_GPR15];
  PTR_DEMANGLE (sp);
  return (uintptr_t) 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)