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 "print_fields.h"
34 #include <linux/aio_abi.h>
35
SYS_FUNC(io_setup)36 SYS_FUNC(io_setup)
37 {
38 if (entering(tcp))
39 tprintf("%u, ", (unsigned int) tcp->u_arg[0]);
40 else
41 printnum_ptr(tcp, tcp->u_arg[1]);
42 return 0;
43 }
44
SYS_FUNC(io_destroy)45 SYS_FUNC(io_destroy)
46 {
47 printaddr(tcp->u_arg[0]);
48
49 return RVAL_DECODED;
50 }
51
52 enum iocb_sub {
53 SUB_NONE, SUB_COMMON, SUB_VECTOR
54 };
55
56 static enum iocb_sub
tprint_lio_opcode(unsigned int cmd)57 tprint_lio_opcode(unsigned int cmd)
58 {
59 static const struct {
60 const char *name;
61 enum iocb_sub sub;
62 } cmds[] = {
63 { "IOCB_CMD_PREAD", SUB_COMMON },
64 { "IOCB_CMD_PWRITE", SUB_COMMON },
65 { "IOCB_CMD_FSYNC", SUB_NONE },
66 { "IOCB_CMD_FDSYNC", SUB_NONE },
67 { "IOCB_CMD_PREADX", SUB_NONE },
68 { "IOCB_CMD_POLL", SUB_NONE },
69 { "IOCB_CMD_NOOP", SUB_NONE },
70 { "IOCB_CMD_PREADV", SUB_VECTOR },
71 { "IOCB_CMD_PWRITEV", SUB_VECTOR },
72 };
73
74 if (cmd < ARRAY_SIZE(cmds)) {
75 tprints(cmds[cmd].name);
76 return cmds[cmd].sub;
77 }
78 tprintf("%u", cmd);
79 tprints_comment("IOCB_CMD_???");
80 return SUB_NONE;
81 }
82
83 static void
print_common_flags(struct tcb * tcp,const struct iocb * cb)84 print_common_flags(struct tcb *tcp, const struct iocb *cb)
85 {
86 /* IOCB_FLAG_RESFD is available since v2.6.22-rc1~47 */
87 #ifdef IOCB_FLAG_RESFD
88 if (cb->aio_flags & IOCB_FLAG_RESFD)
89 PRINT_FIELD_FD(", ", *cb, aio_resfd, tcp);
90
91 if (cb->aio_flags & ~IOCB_FLAG_RESFD)
92 PRINT_FIELD_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 PRINT_FIELD_X("", *cb, aio_data);
111 tprints(", ");
112 }
113
114 if (cb->aio_key) {
115 PRINT_FIELD_U("", *cb, aio_key);
116 tprints(", ");
117 }
118
119 tprints("aio_lio_opcode=");
120 sub = tprint_lio_opcode(cb->aio_lio_opcode);
121 if (cb->aio_reqprio)
122 PRINT_FIELD_D(", ", *cb, aio_reqprio);
123
124 PRINT_FIELD_FD(", ", *cb, aio_fildes, tcp);
125
126 return sub;
127 }
128
129 static void
print_iocb(struct tcb * tcp,const struct iocb * cb)130 print_iocb(struct tcb *tcp, const struct iocb *cb)
131 {
132 enum iocb_sub sub = print_iocb_header(tcp, cb);
133
134 switch (sub) {
135 case SUB_COMMON:
136 if (cb->aio_lio_opcode == 1 && iocb_is_valid(cb)) {
137 PRINT_FIELD_STRN(", ", *cb, aio_buf,
138 cb->aio_nbytes, tcp);
139 } else {
140 PRINT_FIELD_X(", ", *cb, aio_buf);
141 }
142 PRINT_FIELD_U(", ", *cb, aio_nbytes);
143 PRINT_FIELD_D(", ", *cb, aio_offset);
144 print_common_flags(tcp, cb);
145 break;
146 case SUB_VECTOR:
147 if (iocb_is_valid(cb)) {
148 tprints(", aio_buf=");
149 tprint_iov(tcp, cb->aio_nbytes, cb->aio_buf,
150 cb->aio_lio_opcode == 8
151 ? IOV_DECODE_STR
152 : IOV_DECODE_ADDR);
153 } else {
154 PRINT_FIELD_X(", ", *cb, aio_buf);
155 PRINT_FIELD_U(", ", *cb, aio_nbytes);
156 }
157 PRINT_FIELD_D(", ", *cb, aio_offset);
158 print_common_flags(tcp, cb);
159 break;
160 case SUB_NONE:
161 break;
162 }
163 }
164
165 static bool
print_iocbp(struct tcb * tcp,void * elem_buf,size_t elem_size,void * data)166 print_iocbp(struct tcb *tcp, void *elem_buf, size_t elem_size, void *data)
167 {
168 kernel_ulong_t addr;
169 struct iocb cb;
170
171 if (elem_size < sizeof(kernel_ulong_t)) {
172 addr = *(unsigned int *) elem_buf;
173 } else {
174 addr = *(kernel_ulong_t *) elem_buf;
175 }
176
177 tprints("{");
178 if (!umove_or_printaddr(tcp, addr, &cb))
179 print_iocb(tcp, &cb);
180 tprints("}");
181
182 return true;
183 }
184
SYS_FUNC(io_submit)185 SYS_FUNC(io_submit)
186 {
187 const kernel_long_t nr =
188 truncate_klong_to_current_wordsize(tcp->u_arg[1]);
189 const kernel_ulong_t addr = tcp->u_arg[2];
190 kernel_ulong_t iocbp;
191
192 printaddr(tcp->u_arg[0]);
193 tprintf(", %" PRI_kld ", ", nr);
194
195 if (nr < 0)
196 printaddr(addr);
197 else
198 print_array(tcp, addr, nr, &iocbp, current_wordsize,
199 umoven_or_printaddr, print_iocbp, 0);
200
201 return RVAL_DECODED;
202 }
203
204 static bool
print_io_event(struct tcb * tcp,void * elem_buf,size_t elem_size,void * data)205 print_io_event(struct tcb *tcp, void *elem_buf, size_t elem_size, void *data)
206 {
207 struct io_event *event = elem_buf;
208
209 PRINT_FIELD_X("{", *event, data);
210 PRINT_FIELD_X(", ", *event, obj);
211 PRINT_FIELD_D(", ", *event, res);
212 PRINT_FIELD_D(", ", *event, res2);
213 tprints("}");
214
215 return true;
216 }
217
SYS_FUNC(io_cancel)218 SYS_FUNC(io_cancel)
219 {
220 if (entering(tcp)) {
221 printaddr(tcp->u_arg[0]);
222 tprints(", ");
223
224 struct iocb cb;
225
226 if (!umove_or_printaddr(tcp, tcp->u_arg[1], &cb)) {
227 tprints("{");
228 print_iocb_header(tcp, &cb);
229 tprints("}");
230 }
231 tprints(", ");
232 } else {
233 struct io_event event;
234
235 if (!umove_or_printaddr(tcp, tcp->u_arg[2], &event))
236 print_io_event(tcp, &event, sizeof(event), 0);
237 }
238 return 0;
239 }
240
SYS_FUNC(io_getevents)241 SYS_FUNC(io_getevents)
242 {
243 if (entering(tcp)) {
244 printaddr(tcp->u_arg[0]);
245 tprintf(", %" PRI_kld ", %" PRI_kld ", ",
246 truncate_klong_to_current_wordsize(tcp->u_arg[1]),
247 truncate_klong_to_current_wordsize(tcp->u_arg[2]));
248 } else {
249 struct io_event buf;
250 print_array(tcp, tcp->u_arg[3], tcp->u_rval, &buf, sizeof(buf),
251 umoven_or_printaddr, print_io_event, 0);
252 tprints(", ");
253 /*
254 * Since the timeout parameter is read by the kernel
255 * on entering syscall, it has to be decoded the same way
256 * whether the syscall has failed or not.
257 */
258 temporarily_clear_syserror(tcp);
259 print_timespec(tcp, tcp->u_arg[4]);
260 restore_cleared_syserror(tcp);
261 }
262 return 0;
263 }
264