summaryrefslogtreecommitdiffstats
path: root/usr.bin/truss/sparc64-fbsd.c
blob: 896bac749395bd17cd2d9b82baf13eada4571b6b (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
/*
 * Copryight 1998 Sean Eric Fagan
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by Sean Eric Fagan
 * 4. Neither the name of the author may be used to endorse or promote
 *    products derived from this software without specific prior written
 *    permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#ifndef lint
static const char rcsid[] =
  "$FreeBSD$";
#endif /* not lint */

/*
 * FreeBSD/sparc64-specific system call handling.  This is probably the most
 * complex part of the entire truss program, although I've got lots of
 * it handled relatively cleanly now.  The system call names are generated
 * automatically, thanks to /usr/src/sys/kern/syscalls.master.  The
 * names used for the various structures are confusing, I sadly admit.
 *
 * This file is almost nothing more than a slightly-edited i386-fbsd.c.
 */

#include <sys/types.h>
#include <sys/ptrace.h>
#include <sys/syscall.h>

#include <machine/frame.h>
#include <machine/reg.h>
#include <machine/tstate.h>

#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <signal.h>
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>

#include "truss.h"
#include "syscall.h"
#include "extern.h"

static int cpid = -1;

#include "syscalls.h"

static int nsyscalls = sizeof(syscallnames) / sizeof(syscallnames[0]);

/*
 * This is what this particular file uses to keep track of a system call.
 * It is probably not quite sufficient -- I can probably use the same
 * structure for the various syscall personalities, and I also probably
 * need to nest system calls (for signal handlers).
 *
 * 'struct syscall' describes the system call; it may be NULL, however,
 * if we don't know about this particular system call yet.
 */
static struct freebsd_syscall {
	struct syscall *sc;
	const char *name;
	int number;
	unsigned long *args;
	int nargs;	/* number of arguments -- *not* number of words! */
	char **s_args;	/* the printable arguments */
} fsc;

/* Clear up and free parts of the fsc structure. */
static __inline void
clear_fsc(void) {
  if (fsc.args) {
    free(fsc.args);
  }
  if (fsc.s_args) {
    int i;
    for (i = 0; i < fsc.nargs; i++)
      if (fsc.s_args[i])
	free(fsc.s_args[i]);
    free(fsc.s_args);
  }
  memset(&fsc, 0, sizeof(fsc));
}

/*
 * Called when a process has entered a system call.  nargs is the
 * number of words, not number of arguments (a necessary distinction
 * in some cases).  Note that if the STOPEVENT() code in sparc64/sparc64/trap.c
 * is ever changed these functions need to keep up.
 */

void
sparc64_syscall_entry(struct trussinfo *trussinfo, int nargs) {
  struct reg regs;
  int syscall_num;
  int i;
  struct syscall *sc;
  int indir = 0;	/* indirect system call */
  struct ptrace_io_desc iorequest;

  cpid = trussinfo->curthread->tid;

  clear_fsc();
  
  if (ptrace(PT_GETREGS, cpid, (caddr_t)&regs, 0) < 0) {
    fprintf(trussinfo->outfile, "-- CANNOT READ REGISTERS --\n");
    return;
  }

  /*
   * FreeBSD has two special kinds of system call redirctions --
   * SYS_syscall, and SYS___syscall.  The former is the old syscall()
   * routine, basicly; the latter is for quad-aligned arguments.
   */
  syscall_num = regs.r_global[1];
  if (syscall_num == SYS_syscall || syscall_num == SYS___syscall) {
    indir = 1;
    syscall_num = regs.r_out[0];
  }

  fsc.number = syscall_num;
  fsc.name =
    (syscall_num < 0 || syscall_num > nsyscalls) ? NULL : syscallnames[syscall_num];
  if (!fsc.name) {
    fprintf(trussinfo->outfile, "-- UNKNOWN SYSCALL %d --\n", syscall_num);
  }

  if (fsc.name && (trussinfo->flags & FOLLOWFORKS)
   && ((!strcmp(fsc.name, "fork")
    || !strcmp(fsc.name, "rfork")
    || !strcmp(fsc.name, "vfork"))))
  {
    trussinfo->curthread->in_fork = 1;
  }

  if (nargs == 0)
    return;

  fsc.args = malloc((1+nargs) * sizeof(unsigned long));
  switch (nargs) {
  default:
	/*
	 * The OS doesn't seem to allow more than 10 words of
	 * parameters (yay!).  So we shouldn't be here.
	 */
	warn("More than 10 words (%d) of arguments!\n", nargs);
	break;
  case 10: case 9: case 8: case 7:
	/*
	 * If there are 7-10 words of arguments, they are placed
	 * on the stack, as is normal for other processors.
	 * The fall-through for all of these is deliberate!!!
	 */
	iorequest.piod_op = PIOD_READ_D;
	iorequest.piod_offs = (void *)(regs.r_out[6] + SPOFF +
	    offsetof(struct frame, fr_pad[6]));
	iorequest.piod_addr = &fsc.args[6];
	iorequest.piod_len = (nargs - 6) * sizeof(fsc.args[0]);
	ptrace(PT_IO, cpid, (caddr_t)&iorequest, 0);
	if (iorequest.piod_len == 0) return;

  case 6:	fsc.args[5] = regs.r_out[5];
  case 5:	fsc.args[4] = regs.r_out[4];
  case 4:	fsc.args[3] = regs.r_out[3];
  case 3:	fsc.args[2] = regs.r_out[2];
  case 2:	fsc.args[1] = regs.r_out[1];
  case 1:	fsc.args[0] = regs.r_out[0];
  case 0:
	break;
  }

  if (indir) {
    memmove(&fsc.args[0], &fsc.args[1], (nargs-1) * sizeof(fsc.args[0]));
  }

  sc = get_syscall(fsc.name);
  if (sc) {
    fsc.nargs = sc->nargs;
  } else {
#if DEBUG
    fprintf(trussinfo->outfile, "unknown syscall %s -- setting args to %d\n",
	   fsc.name, nargs);
#endif
    fsc.nargs = nargs;
  }

  fsc.s_args = malloc((1+fsc.nargs) * sizeof(char*));
  memset(fsc.s_args, 0, fsc.nargs * sizeof(char*));
  fsc.sc = sc;

  /*
   * At this point, we set up the system call arguments.
   * We ignore any OUT ones, however -- those are arguments that
   * are set by the system call, and so are probably meaningless
   * now.  This doesn't currently support arguments that are
   * passed in *and* out, however.
   */

  if (fsc.name) {

#if DEBUG
    fprintf(stderr, "syscall %s(", fsc.name);
#endif
    for (i = 0; i < fsc.nargs; i++) {
#if DEBUG
      fprintf(stderr, "0x%x%s",
	      sc
	      ? fsc.args[sc->args[i].offset]
	      : fsc.args[i],
	      i < (fsc.nargs - 1) ? "," : "");
#endif
      if (sc && !(sc->args[i].type & OUT)) {
	fsc.s_args[i] = print_arg(&sc->args[i], fsc.args, 0, trussinfo);
      }
    }
#if DEBUG
    fprintf(stderr, ")\n");
#endif
  }

#if DEBUG
  fprintf(trussinfo->outfile, "\n");
#endif

  if (fsc.name != NULL &&
      (!strcmp(fsc.name, "execve") || !strcmp(fsc.name, "exit"))) {

    /* XXX
     * This could be done in a more general
     * manner but it still wouldn't be very pretty.
     */
    if (!strcmp(fsc.name, "execve")) {
        if ((trussinfo->flags & EXECVEARGS) == 0)
          if (fsc.s_args[1]) {
            free(fsc.s_args[1]);
            fsc.s_args[1] = NULL;
          }
        if ((trussinfo->flags & EXECVEENVS) == 0)
          if (fsc.s_args[2]) {
            free(fsc.s_args[2]);
            fsc.s_args[2] = NULL;
          }
    }
  }

  return;
}

/*
 * And when the system call is done, we handle it here.
 * Currently, no attempt is made to ensure that the system calls
 * match -- this needs to be fixed (and is, in fact, why S_SCX includes
 * the sytem call number instead of, say, an error status).
 */

long
sparc64_syscall_exit(struct trussinfo *trussinfo, int syscall_num __unused) {
  struct reg regs;
  long retval;
  int i;
  int errorp;
  struct syscall *sc;

  if (fsc.name == NULL)
	return (-1);
  cpid = trussinfo->curthread->tid;

  if (ptrace(PT_GETREGS, cpid, (caddr_t)&regs, 0) < 0) {
    fprintf(trussinfo->outfile, "\n");
    return (-1);
  }
  retval = regs.r_out[0];
  errorp = !!(regs.r_tstate & TSTATE_XCC_C);

  /*
   * This code, while simpler than the initial versions I used, could
   * stand some significant cleaning.
   */

  sc = fsc.sc;
  if (!sc) {
    for (i = 0; i < fsc.nargs; i++)
      asprintf(&fsc.s_args[i], "0x%lx", fsc.args[i]);
  } else {
    /*
     * Here, we only look for arguments that have OUT masked in --
     * otherwise, they were handled in the syscall_entry function.
     */
    for (i = 0; i < sc->nargs; i++) {
      char *temp;
      if (sc->args[i].type & OUT) {
	/*
	 * If an error occurred, than don't bothe getting the data;
	 * it may not be valid.
	 */
	if (errorp)
	  asprintf(&temp, "0x%lx", fsc.args[sc->args[i].offset]);
	else
	  temp = print_arg(&sc->args[i], fsc.args, retval, trussinfo);
	fsc.s_args[i] = temp;
      }
    }
  }

  if (fsc.name != NULL &&
      (!strcmp(fsc.name, "execve") || !strcmp(fsc.name, "exit"))) {
	trussinfo->curthread->in_syscall = 1;
  }
  /*
   * It would probably be a good idea to merge the error handling,
   * but that complicates things considerably.
   */

  print_syscall_ret(trussinfo, fsc.name, fsc.nargs, fsc.s_args, errorp, retval);
  clear_fsc();

  return (retval);
}
OpenPOWER on IntegriCloud