1 /*
2 * Copyright (c) 2014-2015 Dmitry V. Levin <ldv@altlinux.org>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. The name of the author may not be used to endorse or promote products
14 * derived from this software without specific prior written permission.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26 */
27
28 #include "defs.h"
29
30 #include "xlat/kexec_load_flags.h"
31 #include "xlat/kexec_arch_values.h"
32
33 #ifndef KEXEC_ARCH_MASK
34 # define KEXEC_ARCH_MASK 0xffff0000
35 #endif
36 #ifndef KEXEC_SEGMENT_MAX
37 # define KEXEC_SEGMENT_MAX 16
38 #endif
39
40 static bool
print_seg(struct tcb * tcp,void * elem_buf,size_t elem_size,void * data)41 print_seg(struct tcb *tcp, void *elem_buf, size_t elem_size, void *data)
42 {
43 const kernel_ulong_t *seg;
44 kernel_ulong_t seg_buf[4];
45
46 if (elem_size < sizeof(seg_buf)) {
47 unsigned int i;
48
49 for (i = 0; i < ARRAY_SIZE(seg_buf); ++i)
50 seg_buf[i] = ((unsigned int *) elem_buf)[i];
51 seg = seg_buf;
52 } else {
53 seg = elem_buf;
54 }
55
56 tprints("{buf=");
57 printaddr(seg[0]);
58 tprintf(", bufsz=%" PRI_klu ", mem=", seg[1]);
59 printaddr(seg[2]);
60 tprintf(", memsz=%" PRI_klu "}", seg[3]);
61
62 return true;
63 }
64
65 static void
print_kexec_segments(struct tcb * const tcp,const kernel_ulong_t addr,const kernel_ulong_t len)66 print_kexec_segments(struct tcb *const tcp, const kernel_ulong_t addr,
67 const kernel_ulong_t len)
68 {
69 if (len > KEXEC_SEGMENT_MAX) {
70 printaddr(addr);
71 return;
72 }
73
74 kernel_ulong_t seg[4];
75 const size_t sizeof_seg = ARRAY_SIZE(seg) * current_wordsize;
76
77 print_array(tcp, addr, len, seg, sizeof_seg,
78 umoven_or_printaddr, print_seg, 0);
79 }
80
SYS_FUNC(kexec_load)81 SYS_FUNC(kexec_load)
82 {
83 /* entry, nr_segments */
84 printaddr(tcp->u_arg[0]);
85 tprintf(", %" PRI_klu ", ", tcp->u_arg[1]);
86
87 /* segments */
88 print_kexec_segments(tcp, tcp->u_arg[2], tcp->u_arg[1]);
89 tprints(", ");
90
91 /* flags */
92 kernel_ulong_t n = tcp->u_arg[3];
93 printxval64(kexec_arch_values, n & KEXEC_ARCH_MASK, "KEXEC_ARCH_???");
94 n &= ~(kernel_ulong_t) KEXEC_ARCH_MASK;
95 if (n) {
96 tprints("|");
97 printflags64(kexec_load_flags, n, "KEXEC_???");
98 }
99
100 return RVAL_DECODED;
101 }
102
103 #include "xlat/kexec_file_load_flags.h"
104
SYS_FUNC(kexec_file_load)105 SYS_FUNC(kexec_file_load)
106 {
107 /* kernel_fd */
108 printfd(tcp, tcp->u_arg[0]);
109 tprints(", ");
110 /* initrd_fd */
111 printfd(tcp, tcp->u_arg[1]);
112 tprints(", ");
113 /* cmdline_len */
114 tprintf("%" PRI_klu ", ", tcp->u_arg[2]);
115 /* cmdline */
116 printstrn(tcp, tcp->u_arg[3], tcp->u_arg[2]);
117 tprints(", ");
118 /* flags */
119 printflags64(kexec_file_load_flags, tcp->u_arg[4], "KEXEC_FILE_???");
120
121 return RVAL_DECODED;
122 }
123