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, 1994, 1995, 1996 Rick Sladkey <jrs@world.std.com>
5 * Copyright (c) 1996-1999 Wichert Akkerman <wichert@cistron.nl>
6 * Copyright (c) 1999-2017 The strace developers.
7 * All rights reserved.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 * 3. The name of the author may not be used to endorse or promote products
18 * derived from this software without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
21 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
22 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
23 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
24 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
25 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
26 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
27 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
28 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
29 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
30 */
31
32 #include "defs.h"
33 #include <linux/aio_abi.h>
34
SYS_FUNC(io_setup)35 SYS_FUNC(io_setup)
36 {
37 if (entering(tcp))
38 tprintf("%u, ", (unsigned int) tcp->u_arg[0]);
39 else
40 printnum_ptr(tcp, tcp->u_arg[1]);
41 return 0;
42 }
43
SYS_FUNC(io_destroy)44 SYS_FUNC(io_destroy)
45 {
46 printaddr(tcp->u_arg[0]);
47
48 return RVAL_DECODED;
49 }
50
51 enum iocb_sub {
52 SUB_NONE, SUB_COMMON, SUB_VECTOR
53 };
54
55 static enum iocb_sub
tprint_lio_opcode(unsigned cmd)56 tprint_lio_opcode(unsigned cmd)
57 {
58 static const struct {
59 const char *name;
60 enum iocb_sub sub;
61 } cmds[] = {
62 { "pread", SUB_COMMON },
63 { "pwrite", SUB_COMMON },
64 { "fsync", SUB_NONE },
65 { "fdsync", SUB_NONE },
66 { "preadx", SUB_NONE },
67 { "poll", SUB_NONE },
68 { "noop", SUB_NONE },
69 { "preadv", SUB_VECTOR },
70 { "pwritev", SUB_VECTOR },
71 };
72
73 if (cmd < ARRAY_SIZE(cmds)) {
74 tprints(cmds[cmd].name);
75 return cmds[cmd].sub;
76 }
77 tprintf("%u", cmd);
78 tprints_comment("SUB_???");
79 return SUB_NONE;
80 }
81
82 static void
print_common_flags(struct tcb * tcp,const struct iocb * cb)83 print_common_flags(struct tcb *tcp, const struct iocb *cb)
84 {
85 /* IOCB_FLAG_RESFD is available since v2.6.22-rc1~47 */
86 #ifdef IOCB_FLAG_RESFD
87 if (cb->aio_flags & IOCB_FLAG_RESFD) {
88 tprints(", resfd=");
89 printfd(tcp, cb->aio_resfd);
90 }
91 if (cb->aio_flags & ~IOCB_FLAG_RESFD)
92 tprintf(", flags=%#x", cb->aio_flags);
93 #endif
94 }
95
96 static bool
iocb_is_valid(const struct iocb * cb)97 iocb_is_valid(const struct iocb *cb)
98 {
99 return cb->aio_buf == (unsigned long) cb->aio_buf &&
100 cb->aio_nbytes == (size_t) cb->aio_nbytes &&
101 (ssize_t) cb->aio_nbytes >= 0;
102 }
103
104 static enum iocb_sub
print_iocb_header(struct tcb * tcp,const struct iocb * cb)105 print_iocb_header(struct tcb *tcp, const struct iocb *cb)
106 {
107 enum iocb_sub sub;
108
109 if (cb->aio_data)
110 tprintf("data=%#" PRIx64 ", ",
111 (uint64_t) cb->aio_data);
112
113 if (cb->aio_key)
114 tprintf("key=%u, ", cb->aio_key);
115
116 sub = tprint_lio_opcode(cb->aio_lio_opcode);
117 if (cb->aio_reqprio)
118 tprintf(", reqprio=%hd", cb->aio_reqprio);
119
120 tprints(", fildes=");
121 printfd(tcp, cb->aio_fildes);
122
123 return sub;
124 }
125
126 static void
print_iocb(struct tcb * tcp,const struct iocb * cb)127 print_iocb(struct tcb *tcp, const struct iocb *cb)
128 {
129 enum iocb_sub sub = print_iocb_header(tcp, cb);
130
131 switch (sub) {
132 case SUB_COMMON:
133 if (cb->aio_lio_opcode == 1 && iocb_is_valid(cb)) {
134 tprints(", str=");
135 printstrn(tcp, cb->aio_buf, cb->aio_nbytes);
136 } else {
137 tprintf(", buf=%#" PRIx64, (uint64_t) cb->aio_buf);
138 }
139 tprintf(", nbytes=%" PRIu64 ", offset=%" PRId64,
140 (uint64_t) cb->aio_nbytes, (int64_t) cb->aio_offset);
141 print_common_flags(tcp, cb);
142 break;
143 case SUB_VECTOR:
144 if (iocb_is_valid(cb)) {
145 tprints(", iovec=");
146 tprint_iov(tcp, cb->aio_nbytes, cb->aio_buf,
147 cb->aio_lio_opcode == 8
148 ? IOV_DECODE_STR
149 : IOV_DECODE_ADDR);
150 } else {
151 tprintf(", buf=%#" PRIx64 ", nbytes=%" PRIu64,
152 (uint64_t) cb->aio_buf,
153 (uint64_t) cb->aio_nbytes);
154 }
155 tprintf(", offset=%" PRId64, (int64_t) cb->aio_offset);
156 print_common_flags(tcp, cb);
157 break;
158 case SUB_NONE:
159 break;
160 }
161 }
162
163 static bool
print_iocbp(struct tcb * tcp,void * elem_buf,size_t elem_size,void * data)164 print_iocbp(struct tcb *tcp, void *elem_buf, size_t elem_size, void *data)
165 {
166 kernel_ulong_t addr;
167 struct iocb cb;
168
169 if (elem_size < sizeof(kernel_ulong_t)) {
170 addr = *(unsigned int *) elem_buf;
171 } else {
172 addr = *(kernel_ulong_t *) elem_buf;
173 }
174
175 tprints("{");
176 if (!umove_or_printaddr(tcp, addr, &cb))
177 print_iocb(tcp, &cb);
178 tprints("}");
179
180 return true;
181 }
182
SYS_FUNC(io_submit)183 SYS_FUNC(io_submit)
184 {
185 const kernel_long_t nr =
186 truncate_klong_to_current_wordsize(tcp->u_arg[1]);
187 const kernel_ulong_t addr = tcp->u_arg[2];
188 kernel_ulong_t iocbp;
189
190 printaddr(tcp->u_arg[0]);
191 tprintf(", %" PRI_kld ", ", nr);
192
193 if (nr < 0)
194 printaddr(addr);
195 else
196 print_array(tcp, addr, nr, &iocbp, current_wordsize,
197 umoven_or_printaddr, print_iocbp, 0);
198
199 return RVAL_DECODED;
200 }
201
202 static bool
print_io_event(struct tcb * tcp,void * elem_buf,size_t elem_size,void * data)203 print_io_event(struct tcb *tcp, void *elem_buf, size_t elem_size, void *data)
204 {
205 struct io_event *event = elem_buf;
206
207 tprintf("{data=%#" PRIx64 ", obj=%#" PRIx64
208 ", res=%" PRId64 ", res2=%" PRId64 "}",
209 (uint64_t) event->data, (uint64_t) event->obj,
210 (int64_t) event->res, (int64_t) event->res2);
211
212 return true;
213 }
214
SYS_FUNC(io_cancel)215 SYS_FUNC(io_cancel)
216 {
217 if (entering(tcp)) {
218 printaddr(tcp->u_arg[0]);
219 tprints(", ");
220
221 struct iocb cb;
222
223 if (!umove_or_printaddr(tcp, tcp->u_arg[1], &cb)) {
224 tprints("{");
225 print_iocb_header(tcp, &cb);
226 tprints("}");
227 }
228 tprints(", ");
229 } else {
230 struct io_event event;
231
232 if (!umove_or_printaddr(tcp, tcp->u_arg[2], &event))
233 print_io_event(tcp, &event, sizeof(event), 0);
234 }
235 return 0;
236 }
237
SYS_FUNC(io_getevents)238 SYS_FUNC(io_getevents)
239 {
240 if (entering(tcp)) {
241 printaddr(tcp->u_arg[0]);
242 tprintf(", %" PRI_kld ", %" PRI_kld ", ",
243 truncate_klong_to_current_wordsize(tcp->u_arg[1]),
244 truncate_klong_to_current_wordsize(tcp->u_arg[2]));
245 } else {
246 struct io_event buf;
247 print_array(tcp, tcp->u_arg[3], tcp->u_rval, &buf, sizeof(buf),
248 umoven_or_printaddr, print_io_event, 0);
249 tprints(", ");
250 /*
251 * Since the timeout parameter is read by the kernel
252 * on entering syscall, it has to be decoded the same way
253 * whether the syscall has failed or not.
254 */
255 temporarily_clear_syserror(tcp);
256 print_timespec(tcp, tcp->u_arg[4]);
257 restore_cleared_syserror(tcp);
258 }
259 return 0;
260 }
261