1/*
2 * Copyright (c) 2014-2015 Dmitry V. Levin <ldv@altlinux.org>
3 * Copyright (c) 2014-2017 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
31#include "xlat/kexec_load_flags.h"
32#include "xlat/kexec_arch_values.h"
33
34#ifndef KEXEC_ARCH_MASK
35# define KEXEC_ARCH_MASK 0xffff0000
36#endif
37#ifndef KEXEC_SEGMENT_MAX
38# define KEXEC_SEGMENT_MAX 16
39#endif
40
41static bool
42print_seg(struct tcb *tcp, void *elem_buf, size_t elem_size, void *data)
43{
44	const kernel_ulong_t *seg;
45	kernel_ulong_t seg_buf[4];
46
47	if (elem_size < sizeof(seg_buf)) {
48		unsigned int i;
49
50		for (i = 0; i < ARRAY_SIZE(seg_buf); ++i)
51			seg_buf[i] = ((unsigned int *) elem_buf)[i];
52		seg = seg_buf;
53	} else {
54		seg = elem_buf;
55	}
56
57	tprints("{buf=");
58	printaddr(seg[0]);
59	tprintf(", bufsz=%" PRI_klu ", mem=", seg[1]);
60	printaddr(seg[2]);
61	tprintf(", memsz=%" PRI_klu "}", seg[3]);
62
63	return true;
64}
65
66static void
67print_kexec_segments(struct tcb *const tcp, const kernel_ulong_t addr,
68		     const kernel_ulong_t len)
69{
70	if (len > KEXEC_SEGMENT_MAX) {
71		printaddr(addr);
72		return;
73	}
74
75	kernel_ulong_t seg[4];
76	const size_t sizeof_seg = ARRAY_SIZE(seg) * current_wordsize;
77
78	print_array(tcp, addr, len, seg, sizeof_seg,
79		    umoven_or_printaddr, print_seg, 0);
80}
81
82SYS_FUNC(kexec_load)
83{
84	/* entry, nr_segments */
85	printaddr(tcp->u_arg[0]);
86	tprintf(", %" PRI_klu ", ", tcp->u_arg[1]);
87
88	/* segments */
89	print_kexec_segments(tcp, tcp->u_arg[2], tcp->u_arg[1]);
90	tprints(", ");
91
92	/* flags */
93	kernel_ulong_t n = tcp->u_arg[3];
94	printxval64(kexec_arch_values, n & KEXEC_ARCH_MASK, "KEXEC_ARCH_???");
95	n &= ~(kernel_ulong_t) KEXEC_ARCH_MASK;
96	if (n) {
97		tprints("|");
98		printflags64(kexec_load_flags, n, "KEXEC_???");
99	}
100
101	return RVAL_DECODED;
102}
103
104#include "xlat/kexec_file_load_flags.h"
105
106SYS_FUNC(kexec_file_load)
107{
108	/* kernel_fd */
109	printfd(tcp, tcp->u_arg[0]);
110	tprints(", ");
111	/* initrd_fd */
112	printfd(tcp, tcp->u_arg[1]);
113	tprints(", ");
114	/* cmdline_len */
115	tprintf("%" PRI_klu ", ", tcp->u_arg[2]);
116	/* cmdline */
117	printstrn(tcp, tcp->u_arg[3], tcp->u_arg[2]);
118	tprints(", ");
119	/* flags */
120	printflags64(kexec_file_load_flags, tcp->u_arg[4], "KEXEC_FILE_???");
121
122	return RVAL_DECODED;
123}
124