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 <bits/wordsize.h>
23 #include <sysdep.h>
24
25
26 /* Test if longjmp to JMPBUF would unwind the frame
27 containing a local variable at ADDRESS. */
28 #define _JMPBUF_UNWINDS(jmpbuf, address, demangle) \
29 ((void *) (address) < (void *) demangle ((jmpbuf)->__gregs[__JB_GPR15]))
30
31
32 /* On s390{,x}, CFA is always 96 (resp. 160) bytes above actual
33 %r15. */
34 #define _JMPBUF_CFA_UNWINDS_ADJ(_jmpbuf, _context, _adj) \
35 _JMPBUF_UNWINDS_ADJ (_jmpbuf, \
36 (void *) (_Unwind_GetCFA (_context) \
37 - 32 - 2 * __WORDSIZE), _adj)
38
39 static inline uintptr_t __attribute__ ((unused))
_jmpbuf_sp(__jmp_buf regs)40 _jmpbuf_sp (__jmp_buf regs)
41 {
42 void *sp = (void *) (uintptr_t) regs[0].__gregs[__JB_GPR15];
43 #ifdef PTR_DEMANGLE
44 PTR_DEMANGLE (sp);
45 #endif
46 return (uintptr_t) sp;
47 }
48
49 #define _JMPBUF_UNWINDS_ADJ(_jmpbuf, _address, _adj) \
50 ((uintptr_t) (_address) - (_adj) < _jmpbuf_sp (_jmpbuf) - (_adj))
51
52 /* We use the normal longjmp for unwinding. */
53 #define __libc_unwind_longjmp(buf, val) __libc_longjmp (buf, val)
54