1 /*
2 * Copyright (c) 1991, 1992 Paul Kranenburg <pk@cs.few.eur.nl>
3 * Copyright (c) 1993 Branko Lankester <branko@hacktic.nl>
4 * Copyright (c) 1993-1996 Rick Sladkey <jrs@world.std.com>
5 * Copyright (c) 1996-1999 Wichert Akkerman <wichert@cistron.nl>
6 * Copyright (c) 2005-2015 Dmitry V. Levin <ldv@altlinux.org>
7 * Copyright (c) 2015 Elvira Khabirova <lineprinter0@gmail.com>
8 * Copyright (c) 2015-2017 The strace developers.
9 * All rights reserved.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 * 3. The name of the author may not be used to endorse or promote products
20 * derived from this software without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
23 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
24 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
25 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
26 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
27 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
28 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
29 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
30 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
31 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
32 */
33
34 #include "defs.h"
35
36 #include DEF_MPERS_TYPE(stack_t)
37
38 #include <signal.h>
39
40 #include MPERS_DEFS
41
42 #include "xlat/sigaltstack_flags.h"
43
44 static void
print_stack_t(struct tcb * const tcp,const kernel_ulong_t addr)45 print_stack_t(struct tcb *const tcp, const kernel_ulong_t addr)
46 {
47 stack_t ss;
48
49 if (umove_or_printaddr(tcp, addr, &ss))
50 return;
51
52 tprints("{ss_sp=");
53 printaddr(ptr_to_kulong(ss.ss_sp));
54 tprints(", ss_flags=");
55 printflags(sigaltstack_flags, ss.ss_flags, "SS_???");
56 tprintf(", ss_size=%" PRI_klu "}", (kernel_ulong_t) ss.ss_size);
57 }
58
SYS_FUNC(sigaltstack)59 SYS_FUNC(sigaltstack)
60 {
61 if (entering(tcp)) {
62 print_stack_t(tcp, tcp->u_arg[0]);
63 tprints(", ");
64 } else {
65 print_stack_t(tcp, tcp->u_arg[1]);
66 }
67 return 0;
68 }
69