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Fix explicit casts of signed integer types to unsigned long long
[strace] / io.c
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 <fcntl.h>
33 #include <sys/uio.h>
34
35 SYS_FUNC(read)
36 {
37         if (entering(tcp)) {
38                 printfd(tcp, tcp->u_arg[0]);
39                 tprints(", ");
40         } else {
41                 if (syserror(tcp))
42                         printaddr(tcp->u_arg[1]);
43                 else
44                         printstr(tcp, tcp->u_arg[1], tcp->u_rval);
45                 tprintf(", %lu", tcp->u_arg[2]);
46         }
47         return 0;
48 }
49
50 SYS_FUNC(write)
51 {
52         printfd(tcp, tcp->u_arg[0]);
53         tprints(", ");
54         printstr(tcp, tcp->u_arg[1], tcp->u_arg[2]);
55         tprintf(", %lu", tcp->u_arg[2]);
56
57         return RVAL_DECODED;
58 }
59
60 struct print_iovec_config {
61         int decode_iov;
62         unsigned long data_size;
63 };
64
65 static bool
66 print_iovec(struct tcb *tcp, void *elem_buf, size_t elem_size, void *data)
67 {
68         const unsigned long *iov;
69         unsigned long iov_buf[2];
70         struct print_iovec_config *c = data;
71
72         if (elem_size < sizeof(iov_buf)) {
73                 iov_buf[0] = ((unsigned int *) elem_buf)[0];
74                 iov_buf[1] = ((unsigned int *) elem_buf)[1];
75                 iov = iov_buf;
76         } else {
77                 iov = elem_buf;
78         }
79
80         tprints("{");
81
82         if (c->decode_iov) {
83                 unsigned long len = iov[1];
84                 if (len > c->data_size)
85                         len = c->data_size;
86                 c->data_size -= len;
87                 printstr(tcp, iov[0], len);
88         } else {
89                 printaddr(iov[0]);
90         }
91
92         tprintf(", %lu}", iov[1]);
93
94         return true;
95 }
96
97 /*
98  * data_size limits the cumulative size of printed data.
99  * Example: recvmsg returing a short read.
100  */
101 void
102 tprint_iov_upto(struct tcb *tcp, unsigned long len, unsigned long addr,
103                 int decode_iov, unsigned long data_size)
104 {
105         unsigned long iov[2];
106         struct print_iovec_config config =
107                 { .decode_iov = decode_iov, .data_size = data_size };
108
109         print_array(tcp, addr, len, iov, current_wordsize * 2,
110                     umoven_or_printaddr, print_iovec, &config);
111 }
112
113 void
114 tprint_iov(struct tcb *tcp, unsigned long len, unsigned long addr, int decode_iov)
115 {
116         tprint_iov_upto(tcp, len, addr, decode_iov, (unsigned long) -1L);
117 }
118
119 SYS_FUNC(readv)
120 {
121         if (entering(tcp)) {
122                 printfd(tcp, tcp->u_arg[0]);
123                 tprints(", ");
124         } else {
125                 tprint_iov_upto(tcp, tcp->u_arg[2], tcp->u_arg[1], 1,
126                                 tcp->u_rval);
127                 tprintf(", %lu", tcp->u_arg[2]);
128         }
129         return 0;
130 }
131
132 SYS_FUNC(writev)
133 {
134         printfd(tcp, tcp->u_arg[0]);
135         tprints(", ");
136         tprint_iov(tcp, tcp->u_arg[2], tcp->u_arg[1], 1);
137         tprintf(", %lu", tcp->u_arg[2]);
138
139         return RVAL_DECODED;
140 }
141
142 /* The SH4 ABI does allow long longs in odd-numbered registers, but
143    does not allow them to be split between registers and memory - and
144    there are only four argument registers for normal functions.  As a
145    result pread takes an extra padding argument before the offset.  This
146    was changed late in the 2.4 series (around 2.4.20).  */
147 #if defined(SH)
148 #define PREAD_OFFSET_ARG 4
149 #else
150 #define PREAD_OFFSET_ARG 3
151 #endif
152
153 SYS_FUNC(pread)
154 {
155         if (entering(tcp)) {
156                 printfd(tcp, tcp->u_arg[0]);
157                 tprints(", ");
158         } else {
159                 if (syserror(tcp))
160                         printaddr(tcp->u_arg[1]);
161                 else
162                         printstr(tcp, tcp->u_arg[1], tcp->u_rval);
163                 tprintf(", %lu, ", tcp->u_arg[2]);
164                 printllval(tcp, "%lld", PREAD_OFFSET_ARG);
165         }
166         return 0;
167 }
168
169 SYS_FUNC(pwrite)
170 {
171         printfd(tcp, tcp->u_arg[0]);
172         tprints(", ");
173         printstr(tcp, tcp->u_arg[1], tcp->u_arg[2]);
174         tprintf(", %lu, ", tcp->u_arg[2]);
175         printllval(tcp, "%lld", PREAD_OFFSET_ARG);
176
177         return RVAL_DECODED;
178 }
179
180 static void
181 print_lld_from_low_high_val(struct tcb *tcp, int arg)
182 {
183 #if SIZEOF_LONG == SIZEOF_LONG_LONG
184 # if SUPPORTED_PERSONALITIES > 1
185 #  ifdef X86_64
186         if (current_personality != 1)
187 #  else
188         if (current_wordsize == sizeof(long))
189 #  endif
190 # endif
191                 tprintf("%ld", tcp->u_arg[arg]);
192 # if SUPPORTED_PERSONALITIES > 1
193         else
194                 tprintf("%ld",
195                         ((unsigned long) tcp->u_arg[arg + 1] << current_wordsize * 8)
196                         | (unsigned long) tcp->u_arg[arg]);
197 # endif
198 #else
199 # ifdef X32
200         if (current_personality == 0)
201                 tprintf("%lld", tcp->ext_arg[arg]);
202         else
203 # endif
204         tprintf("%lld",
205                 (widen_to_ull(tcp->u_arg[arg + 1]) << sizeof(long) * 8)
206                 | widen_to_ull(tcp->u_arg[arg]));
207 #endif
208 }
209
210 #include "xlat/rwf_flags.h"
211
212 static int
213 do_preadv(struct tcb *tcp, const int flags_arg)
214 {
215         if (entering(tcp)) {
216                 printfd(tcp, tcp->u_arg[0]);
217                 tprints(", ");
218         } else {
219                 tprint_iov_upto(tcp, tcp->u_arg[2], tcp->u_arg[1], 1,
220                                 tcp->u_rval);
221                 tprintf(", %lu, ", tcp->u_arg[2]);
222                 print_lld_from_low_high_val(tcp, 3);
223                 if (flags_arg >= 0) {
224                         tprints(", ");
225                         printflags(rwf_flags, tcp->u_arg[flags_arg], "RWF_???");
226                 }
227         }
228         return 0;
229 }
230
231 SYS_FUNC(preadv)
232 {
233         return do_preadv(tcp, -1);
234 }
235
236 SYS_FUNC(preadv2)
237 {
238         return do_preadv(tcp, 5);
239 }
240
241 static int
242 do_pwritev(struct tcb *tcp, const int flags_arg)
243 {
244         printfd(tcp, tcp->u_arg[0]);
245         tprints(", ");
246         tprint_iov(tcp, tcp->u_arg[2], tcp->u_arg[1], 1);
247         tprintf(", %lu, ", tcp->u_arg[2]);
248         print_lld_from_low_high_val(tcp, 3);
249         if (flags_arg >= 0) {
250                 tprints(", ");
251                 printflags(rwf_flags, tcp->u_arg[flags_arg], "RWF_???");
252         }
253
254         return RVAL_DECODED;
255 }
256
257 SYS_FUNC(pwritev)
258 {
259         return do_pwritev(tcp, -1);
260 }
261
262 SYS_FUNC(pwritev2)
263 {
264         return do_pwritev(tcp, 5);
265 }
266
267 #include "xlat/splice_flags.h"
268
269 SYS_FUNC(tee)
270 {
271         /* int fd_in */
272         printfd(tcp, tcp->u_arg[0]);
273         tprints(", ");
274         /* int fd_out */
275         printfd(tcp, tcp->u_arg[1]);
276         tprints(", ");
277         /* size_t len */
278         tprintf("%lu, ", tcp->u_arg[2]);
279         /* unsigned int flags */
280         printflags(splice_flags, tcp->u_arg[3], "SPLICE_F_???");
281
282         return RVAL_DECODED;
283 }
284
285 SYS_FUNC(splice)
286 {
287         /* int fd_in */
288         printfd(tcp, tcp->u_arg[0]);
289         tprints(", ");
290         /* loff_t *off_in */
291         printnum_int64(tcp, tcp->u_arg[1], "%" PRId64);
292         tprints(", ");
293         /* int fd_out */
294         printfd(tcp, tcp->u_arg[2]);
295         tprints(", ");
296         /* loff_t *off_out */
297         printnum_int64(tcp, tcp->u_arg[3], "%" PRId64);
298         tprints(", ");
299         /* size_t len */
300         tprintf("%lu, ", tcp->u_arg[4]);
301         /* unsigned int flags */
302         printflags(splice_flags, tcp->u_arg[5], "SPLICE_F_???");
303
304         return RVAL_DECODED;
305 }
306
307 SYS_FUNC(vmsplice)
308 {
309         /* int fd */
310         printfd(tcp, tcp->u_arg[0]);
311         tprints(", ");
312         /* const struct iovec *iov, unsigned long nr_segs */
313         tprint_iov(tcp, tcp->u_arg[2], tcp->u_arg[1], 1);
314         tprintf(", %lu, ", tcp->u_arg[2]);
315         /* unsigned int flags */
316         printflags(splice_flags, tcp->u_arg[3], "SPLICE_F_???");
317
318         return RVAL_DECODED;
319 }