1 /* Copyright (C) 2003-2022 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
24 /* Test if longjmp to JMPBUF would unwind the frame
25 containing a local variable at ADDRESS. */
26 #define _JMPBUF_UNWINDS(jmpbuf, address, demangle) \
27 ((void *) (address) < (void *) demangle ((jmpbuf)[JB_SP]))
28
29 #define _JMPBUF_CFA_UNWINDS_ADJ(_jmpbuf, _context, _adj) \
30 _JMPBUF_UNWINDS_ADJ (_jmpbuf, (void *) _Unwind_GetCFA (_context), _adj)
31
32 static inline uintptr_t __attribute__ ((unused))
_jmpbuf_sp(__jmp_buf regs)33 _jmpbuf_sp (__jmp_buf regs)
34 {
35 uintptr_t sp = regs[JB_SP];
36 #ifdef PTR_DEMANGLE
37 PTR_DEMANGLE (sp);
38 #endif
39 return sp;
40 }
41
42 #define _JMPBUF_UNWINDS_ADJ(_jmpbuf, _address, _adj) \
43 ((uintptr_t) (_address) - (_adj) < _jmpbuf_sp (_jmpbuf) - (_adj))
44
45 /* We use the normal longjmp for unwinding. */
46 #define __libc_unwind_longjmp(buf, val) __libc_longjmp (buf, val)
47