2 * Copyright 2006 Peter Grehan <grehan@freebsd.org>
3 * Copryight 2005 Orlando Bassotto <orlando@break.net>
4 * Copryight 1998 Sean Eric Fagan
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 static const char rcsid[] =
34 * FreeBSD/powerpc-specific system call handling. This is probably the most
35 * complex part of the entire truss program, although I've got lots of
36 * it handled relatively cleanly now. The system call names are generated
37 * automatically, thanks to /usr/src/sys/kern/syscalls.master. The
38 * names used for the various structures are confusing, I sadly admit.
40 * This file is almost nothing more than a slightly-edited i386-fbsd.c.
43 #include <sys/types.h>
44 #include <sys/ioctl.h>
45 #include <sys/pioctl.h>
46 #include <sys/syscall.h>
48 #include <machine/reg.h>
49 #include <machine/frame.h>
70 static int nsyscalls = sizeof(syscallnames) / sizeof(syscallnames[0]);
73 * This is what this particular file uses to keep track of a system call.
74 * It is probably not quite sufficient -- I can probably use the same
75 * structure for the various syscall personalities, and I also probably
76 * need to nest system calls (for signal handlers).
78 * 'struct syscall' describes the system call; it may be NULL, however,
79 * if we don't know about this particular system call yet.
81 static struct freebsd_syscall {
86 int nargs; /* number of arguments -- *not* number of words! */
87 char **s_args; /* the printable arguments */
90 /* Clear up and free parts of the fsc structure. */
98 for (i = 0; i < fsc.nargs; i++)
103 memset(&fsc, 0, sizeof(fsc));
107 * Called when a process has entered a system call. nargs is the
108 * number of words, not number of arguments (a necessary distinction
109 * in some cases). Note that if the STOPEVENT() code in powerpc/powerpc/trap.c
110 * is ever changed these functions need to keep up.
114 powerpc_syscall_entry(struct trussinfo *trussinfo, int nargs) {
120 unsigned int regargs;
123 if (fd == -1 || trussinfo->pid != cpid) {
124 sprintf(buf, "/proc/%d/regs", trussinfo->pid);
125 fd = open(buf, O_RDWR);
127 fprintf(trussinfo->outfile, "-- CANNOT OPEN REGISTERS --\n");
130 cpid = trussinfo->pid;
135 if (read(fd, ®s, sizeof(regs)) != sizeof(regs)) {
136 fprintf(trussinfo->outfile, "-- CANNOT READ REGISTERS --\n");
141 * FreeBSD has two special kinds of system call redirctions --
142 * SYS_syscall, and SYS___syscall. The former is the old syscall()
143 * routine, basicly; the latter is for quad-aligned arguments.
146 syscall_num = regs.fixreg[0];
147 args = ®s.fixreg[3];
148 if (syscall_num == SYS_syscall) {
149 args = ®s.fixreg[4];
151 syscall_num = regs.fixreg[3];
152 } else if (syscall_num == SYS___syscall) {
153 args = ®s.fixreg[5];
155 syscall_num = regs.fixreg[4];
158 fsc.number = syscall_num;
160 (syscall_num < 0 || syscall_num > nsyscalls) ? NULL : syscallnames[syscall_num];
162 fprintf(trussinfo->outfile, "-- UNKNOWN SYSCALL %d --\n", syscall_num);
165 if (fsc.name && (trussinfo->flags & FOLLOWFORKS)
166 && ((!strcmp(fsc.name, "fork")
167 || !strcmp(fsc.name, "rfork")
168 || !strcmp(fsc.name, "vfork"))))
170 trussinfo->in_fork = 1;
176 fsc.args = malloc((1+nargs) * sizeof(unsigned long));
178 if (nargs > regargs) {
179 memmove(&fsc.args[0], args, regargs * sizeof(fsc.args[0]));
180 lseek(Procfd, regs.fixreg[1] + 8, SEEK_SET);
181 read(Procfd, &fsc.args[regargs], (nargs - regargs) * sizeof(fsc.args[0]));
183 memmove(&fsc.args[0], args, nargs * sizeof(fsc.args[0]));
186 sc = get_syscall(fsc.name);
188 fsc.nargs = sc->nargs;
191 fprintf(trussinfo->outfile, "unknown syscall %s -- setting args to %d\n",
197 fsc.s_args = malloc((1+fsc.nargs) * sizeof(char*));
198 memset(fsc.s_args, 0, fsc.nargs * sizeof(char*));
202 * At this point, we set up the system call arguments.
203 * We ignore any OUT ones, however -- those are arguments that
204 * are set by the system call, and so are probably meaningless
205 * now. This doesn't currently support arguments that are
206 * passed in *and* out, however.
212 fprintf(stderr, "syscall %s(", fsc.name);
214 for (i = 0; i < fsc.nargs; i++) {
216 fprintf(stderr, "0x%x%s",
218 ? fsc.args[sc->args[i].offset]
220 i < (fsc.nargs - 1) ? "," : "");
222 if (sc && !(sc->args[i].type & OUT)) {
223 fsc.s_args[i] = print_arg(Procfd, &sc->args[i], fsc.args, 0, trussinfo);
227 fprintf(stderr, ")\n");
232 fprintf(trussinfo->outfile, "\n");
236 * Some system calls should be printed out before they are done --
237 * execve() and exit(), for example, never return. Possibly change
238 * this to work for any system call that doesn't have an OUT
242 if (fsc.name && (!strcmp(fsc.name, "execve") || !strcmp(fsc.name, "exit"))) {
245 * This could be done in a more general
246 * manner but it still wouldn't be very pretty.
248 if (!strcmp(fsc.name, "execve")) {
249 if ((trussinfo->flags & EXECVEARGS) == 0)
252 fsc.s_args[1] = NULL;
254 if ((trussinfo->flags & EXECVEENVS) == 0)
257 fsc.s_args[2] = NULL;
261 print_syscall(trussinfo, fsc.name, fsc.nargs, fsc.s_args);
262 fprintf(trussinfo->outfile, "\n");
269 * And when the system call is done, we handle it here.
270 * Currently, no attempt is made to ensure that the system calls
271 * match -- this needs to be fixed (and is, in fact, why S_SCX includes
272 * the sytem call number instead of, say, an error status).
276 powerpc_syscall_exit(struct trussinfo *trussinfo, int syscall_num __unused)
285 if (fd == -1 || trussinfo->pid != cpid) {
286 sprintf(buf, "/proc/%d/regs", trussinfo->pid);
287 fd = open(buf, O_RDONLY);
289 fprintf(trussinfo->outfile, "-- CANNOT OPEN REGISTERS --\n");
292 cpid = trussinfo->pid;
296 if (read(fd, ®s, sizeof(regs)) != sizeof(regs)) {
297 fprintf(trussinfo->outfile, "\n");
300 retval = regs.fixreg[3];
301 errorp = !!(regs.cr & 0x10000000);
304 * This code, while simpler than the initial versions I used, could
305 * stand some significant cleaning.
310 for (i = 0; i < fsc.nargs; i++)
311 asprintf(&fsc.s_args[i], "0x%lx", fsc.args[i]);
314 * On 32-bit big-endian, the low word of a 64-bit return is
315 * in the greater address. Switch to this. XXX note that
316 * print_syscall_ret can't handle 64-bit return values (llseek)
318 if (sc->ret_type == 2)
319 retval = regs.fixreg[4];
322 * Here, we only look for arguments that have OUT masked in --
323 * otherwise, they were handled in the syscall_entry function.
325 for (i = 0; i < sc->nargs; i++) {
327 if (sc->args[i].type & OUT) {
329 * If an error occurred, than don't bothe getting the data;
330 * it may not be valid.
333 asprintf(&temp, "0x%lx", fsc.args[sc->args[i].offset]);
335 temp = print_arg(Procfd, &sc->args[i], fsc.args, retval, trussinfo);
336 fsc.s_args[i] = temp;
342 * It would probably be a good idea to merge the error handling,
343 * but that complicates things considerably.
346 print_syscall_ret(trussinfo, fsc.name, fsc.nargs, fsc.s_args, errorp, retval);