sysdeps/s390/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 <bits/wordsize.h>
  23 #include <sysdep.h>
  24 #include <pointer_guard.h>
  25
  26
  27 /* Test if longjmp to JMPBUF would unwind the frame
  28    containing a local variable at ADDRESS.  */
  29 #define _JMPBUF_UNWINDS(jmpbuf, address, demangle)                      \
  30   ((void *) (address) < (void *) demangle ((jmpbuf)->__gregs[__JB_GPR15]))
  31
  32
  33 /* On s390{,x}, CFA is always 96 (resp. 160) bytes above actual
  34    %r15.  */
  35 #define _JMPBUF_CFA_UNWINDS_ADJ(_jmpbuf, _context, _adj) \
  36   _JMPBUF_UNWINDS_ADJ (_jmpbuf,                                 \
  37                        (void *) (_Unwind_GetCFA (_context)      \
  38                                  - 32 - 2 * __WORDSIZE), _adj)
  39
  40 static inline uintptr_t __attribute__ ((unused))
  41 _jmpbuf_sp (__jmp_buf regs)
  42 {
  43   void *sp = (void *) (uintptr_t) regs[0].__gregs[__JB_GPR15];
  44   PTR_DEMANGLE (sp);
  45   return (uintptr_t) sp;
  46 }
  47
  48 #define _JMPBUF_UNWINDS_ADJ(_jmpbuf, _address, _adj) \
  49   ((uintptr_t) (_address) - (_adj) < _jmpbuf_sp (_jmpbuf) - (_adj))
  50
  51 /* We use the normal longjmp for unwinding.  */
  52 #define __libc_unwind_longjmp(buf, val) __libc_longjmp (buf, val)