1/*
2 * Copyright (c) 2015 Dmitry V. Levin <ldv@altlinux.org>
3 * Copyright (c) 2015-2017 The strace developers.
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 *    notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 *    notice, this list of conditions and the following disclaimer in the
13 *    documentation and/or other materials provided with the distribution.
14 * 3. The name of the author may not be used to endorse or promote products
15 *    derived from this software without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 */
28
29#include "defs.h"
30#include "print_fields.h"
31#include "xlat/kcmp_types.h"
32
33struct strace_kcmp_epoll_slot {
34	uint32_t efd;
35	uint32_t tfd;
36	uint32_t toff;
37};
38
39static void
40printpidfd(struct tcb *tcp, pid_t pid, int fd)
41{
42	/*
43	 * XXX We want to use printfd here, but we should figure out which
44	 *     process in strace's PID NS is referred to first.
45	 */
46	tprintf("%d", fd);
47}
48
49#define PRINT_FIELD_PIDFD(prefix_, where_, field_, tcp_, pid_)		\
50	do {								\
51		STRACE_PRINTF("%s%s=", (prefix_), #field_);		\
52		printpidfd((tcp_), (pid_), (where_).field_);		\
53	} while (0)
54
55SYS_FUNC(kcmp)
56{
57	pid_t pid1 = tcp->u_arg[0];
58	pid_t pid2 = tcp->u_arg[1];
59	int type = tcp->u_arg[2];
60	kernel_ulong_t idx1 = tcp->u_arg[3];
61	kernel_ulong_t idx2 = tcp->u_arg[4];
62
63	tprintf("%d, %d, ", pid1, pid2);
64	printxval(kcmp_types, type, "KCMP_???");
65
66	switch (type) {
67		case KCMP_FILE:
68			tprints(", ");
69			printpidfd(tcp, pid1, idx1);
70			tprints(", ");
71			printpidfd(tcp, pid1, idx2);
72
73			break;
74
75		case KCMP_EPOLL_TFD: {
76			struct strace_kcmp_epoll_slot slot;
77
78			tprints(", ");
79			printpidfd(tcp, pid1, idx1);
80			tprints(", ");
81
82			if (umove_or_printaddr(tcp, idx2, &slot))
83				break;
84
85			PRINT_FIELD_PIDFD("{",  slot, efd, tcp, pid2);
86			PRINT_FIELD_PIDFD(", ", slot, tfd, tcp, pid2);
87			PRINT_FIELD_U(", ", slot, toff);
88			tprints("}");
89
90			break;
91		}
92
93		case KCMP_FILES:
94		case KCMP_FS:
95		case KCMP_IO:
96		case KCMP_SIGHAND:
97		case KCMP_SYSVSEM:
98		case KCMP_VM:
99			break;
100		default:
101			tprintf(", %#" PRI_klx ", %#" PRI_klx, idx1, idx2);
102	}
103
104	return RVAL_DECODED;
105}
106