1/* Copyright (C) 2003-2020 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3 Contributed by Jakub Jelinek <jakub@redhat.com>, 2003.
4
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
9
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
14
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <https://www.gnu.org/licenses/>. */
18
19#include <setjmp.h>
20#include <jmpbuf-offsets.h>
21#include <stdint.h>
22#include <unwind.h>
23#include <sysdep.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
35static inline uintptr_t __attribute__ ((unused))
36_jmpbuf_sp (__jmp_buf regs)
37{
38 uintptr_t sp = regs[JB_RSP];
39#ifdef PTR_DEMANGLE
40 PTR_DEMANGLE (sp);
41#endif
42 return sp;
43}
44
45#define _JMPBUF_UNWINDS_ADJ(_jmpbuf, _address, _adj) \
46 ((uintptr_t) (_address) - (_adj) < _jmpbuf_sp (_jmpbuf) - (_adj))
47
48/* We use the normal longjmp for unwinding. */
49#define __libc_unwind_longjmp(buf, val) __libc_longjmp (buf, val)
50