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/ptrace.h>
45 #include <sys/syscall.h>
47 #include <machine/reg.h>
48 #include <machine/frame.h>
68 static int nsyscalls = sizeof(syscallnames) / sizeof(syscallnames[0]);
71 * This is what this particular file uses to keep track of a system call.
72 * It is probably not quite sufficient -- I can probably use the same
73 * structure for the various syscall personalities, and I also probably
74 * need to nest system calls (for signal handlers).
76 * 'struct syscall' describes the system call; it may be NULL, however,
77 * if we don't know about this particular system call yet.
79 static struct freebsd_syscall {
84 int nargs; /* number of arguments -- *not* number of words! */
85 char **s_args; /* the printable arguments */
88 /* Clear up and free parts of the fsc structure. */
96 for (i = 0; i < fsc.nargs; i++)
101 memset(&fsc, 0, sizeof(fsc));
105 * Called when a process has entered a system call. nargs is the
106 * number of words, not number of arguments (a necessary distinction
107 * in some cases). Note that if the STOPEVENT() code in powerpc/powerpc/trap.c
108 * is ever changed these functions need to keep up.
112 powerpc_syscall_entry(struct trussinfo *trussinfo, int nargs) {
118 unsigned int regargs;
121 /* Account for a 64-bit argument with corresponding alignment. */
124 cpid = trussinfo->curthread->tid;
127 if (ptrace(PT_GETREGS, cpid, (caddr_t)®s, 0) < 0) {
128 fprintf(trussinfo->outfile, "-- CANNOT READ REGISTERS --\n");
133 * FreeBSD has two special kinds of system call redirctions --
134 * SYS_syscall, and SYS___syscall. The former is the old syscall()
135 * routine, basicly; the latter is for quad-aligned arguments.
138 syscall_num = regs.fixreg[0];
139 args = ®s.fixreg[3];
140 if (syscall_num == SYS_syscall) {
141 args = ®s.fixreg[4];
143 syscall_num = regs.fixreg[3];
144 } else if (syscall_num == SYS___syscall) {
145 args = ®s.fixreg[5];
147 syscall_num = regs.fixreg[4];
150 fsc.number = syscall_num;
152 (syscall_num < 0 || syscall_num >= nsyscalls) ? NULL : syscallnames[syscall_num];
154 fprintf(trussinfo->outfile, "-- UNKNOWN SYSCALL %d --\n", syscall_num);
157 if (fsc.name && (trussinfo->flags & FOLLOWFORKS)
158 && ((!strcmp(fsc.name, "fork")
159 || !strcmp(fsc.name, "rfork")
160 || !strcmp(fsc.name, "vfork"))))
162 trussinfo->curthread->in_fork = 1;
168 fsc.args = malloc((1+nargs) * sizeof(unsigned long));
170 if (nargs > regargs) {
171 struct ptrace_io_desc iorequest;
172 memmove(&fsc.args[0], args, regargs * sizeof(fsc.args[0]));
174 iorequest.piod_op = PIOD_READ_D;
175 iorequest.piod_offs = (void *)(regs.fixreg[1] + 8);
176 iorequest.piod_addr = &fsc.args[regargs];
177 iorequest.piod_len = (nargs - regargs) * sizeof(fsc.args[0]);
178 ptrace(PT_IO, cpid, (caddr_t)&iorequest, 0);
179 if (iorequest.piod_len == 0)
182 memmove(&fsc.args[0], args, nargs * sizeof(fsc.args[0]));
185 sc = get_syscall(fsc.name);
187 fsc.nargs = sc->nargs;
190 fprintf(trussinfo->outfile, "unknown syscall %s -- setting args to %d\n",
196 fsc.s_args = calloc(1, (1+fsc.nargs) * sizeof(char*));
200 * At this point, we set up the system call arguments.
201 * We ignore any OUT ones, however -- those are arguments that
202 * are set by the system call, and so are probably meaningless
203 * now. This doesn't currently support arguments that are
204 * passed in *and* out, however.
210 fprintf(stderr, "syscall %s(", fsc.name);
212 for (i = 0; i < fsc.nargs; i++) {
214 fprintf(stderr, "0x%x%s",
216 ? fsc.args[sc->args[i].offset]
218 i < (fsc.nargs - 1) ? "," : "");
220 if (sc && !(sc->args[i].type & OUT)) {
221 fsc.s_args[i] = print_arg(&sc->args[i], fsc.args, 0, trussinfo);
225 fprintf(stderr, ")\n");
230 fprintf(trussinfo->outfile, "\n");
233 if (fsc.name && (!strcmp(fsc.name, "execve") || !strcmp(fsc.name, "exit"))) {
236 * This could be done in a more general
237 * manner but it still wouldn't be very pretty.
239 if (!strcmp(fsc.name, "execve")) {
240 if ((trussinfo->flags & EXECVEARGS) == 0)
243 fsc.s_args[1] = NULL;
245 if ((trussinfo->flags & EXECVEENVS) == 0)
248 fsc.s_args[2] = NULL;
257 * And when the system call is done, we handle it here.
258 * Currently, no attempt is made to ensure that the system calls
259 * match -- this needs to be fixed (and is, in fact, why S_SCX includes
260 * the sytem call number instead of, say, an error status).
264 powerpc_syscall_exit(struct trussinfo *trussinfo, int syscall_num __unused)
272 if (fsc.name == NULL)
275 cpid = trussinfo->curthread->tid;
277 if (ptrace(PT_GETREGS, cpid, (caddr_t)®s, 0) < 0) {
278 fprintf(trussinfo->outfile, "\n");
281 retval = regs.fixreg[3];
282 errorp = !!(regs.cr & 0x10000000);
285 * This code, while simpler than the initial versions I used, could
286 * stand some significant cleaning.
291 for (i = 0; i < fsc.nargs; i++)
292 asprintf(&fsc.s_args[i], "0x%lx", fsc.args[i]);
295 * On 32-bit big-endian, the low word of a 64-bit return is
296 * in the greater address. Switch to this. XXX note that
297 * print_syscall_ret can't handle 64-bit return values (llseek)
299 if (sc->ret_type == 2)
300 retval = regs.fixreg[4];
303 * Here, we only look for arguments that have OUT masked in --
304 * otherwise, they were handled in the syscall_entry function.
306 for (i = 0; i < sc->nargs; i++) {
308 if (sc->args[i].type & OUT) {
310 * If an error occurred, than don't bothe getting the data;
311 * it may not be valid.
314 asprintf(&temp, "0x%lx", fsc.args[sc->args[i].offset]);
316 temp = print_arg(&sc->args[i], fsc.args, retval, trussinfo);
317 fsc.s_args[i] = temp;
322 if (fsc.name != NULL &&
323 (!strcmp(fsc.name, "execve") || !strcmp(fsc.name, "exit"))) {
324 trussinfo->curthread->in_syscall = 1;
329 * It would probably be a good idea to merge the error handling,
330 * but that complicates things considerably.
333 print_syscall_ret(trussinfo, fsc.name, fsc.nargs, fsc.s_args, errorp,