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