2 * Copyright 2006 Peter Grehan <grehan@freebsd.org>
3 * Copyright 2005 Orlando Bassotto <orlando@break.net>
4 * Copyright 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 powerpc64_syscall_entry(struct trussinfo *trussinfo, int nargs) {
118 unsigned int regargs;
121 cpid = trussinfo->curthread->tid;
124 if (ptrace(PT_GETREGS, cpid, (caddr_t)®s, 0) < 0) {
125 fprintf(trussinfo->outfile, "-- CANNOT READ REGISTERS --\n");
130 * FreeBSD has two special kinds of system call redirctions --
131 * SYS_syscall, and SYS___syscall. The former is the old syscall()
132 * routine, basically; the latter is for quad-aligned arguments.
135 syscall_num = regs.fixreg[0];
136 args = ®s.fixreg[3];
137 if (syscall_num == SYS_syscall || syscall_num == SYS___syscall) {
138 args = ®s.fixreg[4];
140 syscall_num = regs.fixreg[3];
143 fsc.number = syscall_num;
145 (syscall_num < 0 || syscall_num >= nsyscalls) ? NULL : syscallnames[syscall_num];
147 fprintf(trussinfo->outfile, "-- UNKNOWN SYSCALL %d --\n", syscall_num);
150 if (fsc.name && (trussinfo->flags & FOLLOWFORKS)
151 && ((!strcmp(fsc.name, "fork")
152 || !strcmp(fsc.name, "rfork")
153 || !strcmp(fsc.name, "vfork"))))
155 trussinfo->curthread->in_fork = 1;
161 fsc.args = malloc((1+nargs) * sizeof(unsigned long));
163 if (nargs > regargs) {
164 struct ptrace_io_desc iorequest;
165 memmove(&fsc.args[0], args, regargs * sizeof(fsc.args[0]));
167 iorequest.piod_op = PIOD_READ_D;
168 iorequest.piod_offs = (void *)(regs.fixreg[1] + 48);
169 iorequest.piod_addr = &fsc.args[regargs];
170 iorequest.piod_len = (nargs - regargs) * sizeof(fsc.args[0]);
171 ptrace(PT_IO, cpid, (caddr_t)&iorequest, 0);
172 if (iorequest.piod_len == 0)
175 memmove(&fsc.args[0], args, nargs * sizeof(fsc.args[0]));
178 sc = get_syscall(fsc.name);
180 fsc.nargs = sc->nargs;
183 fprintf(trussinfo->outfile, "unknown syscall %s -- setting args to %d\n",
189 fsc.s_args = calloc(1, (1+fsc.nargs) * sizeof(char*));
193 * At this point, we set up the system call arguments.
194 * We ignore any OUT ones, however -- those are arguments that
195 * are set by the system call, and so are probably meaningless
196 * now. This doesn't currently support arguments that are
197 * passed in *and* out, however.
203 fprintf(stderr, "syscall %s(", fsc.name);
205 for (i = 0; i < fsc.nargs; i++) {
207 fprintf(stderr, "0x%x%s",
209 ? fsc.args[sc->args[i].offset]
211 i < (fsc.nargs - 1) ? "," : "");
213 if (sc && !(sc->args[i].type & OUT)) {
214 fsc.s_args[i] = print_arg(&sc->args[i], fsc.args, 0, trussinfo);
218 fprintf(stderr, ")\n");
223 fprintf(trussinfo->outfile, "\n");
226 if (fsc.name && (!strcmp(fsc.name, "execve") || !strcmp(fsc.name, "exit"))) {
229 * This could be done in a more general
230 * manner but it still wouldn't be very pretty.
232 if (!strcmp(fsc.name, "execve")) {
233 if ((trussinfo->flags & EXECVEARGS) == 0)
236 fsc.s_args[1] = NULL;
238 if ((trussinfo->flags & EXECVEENVS) == 0)
241 fsc.s_args[2] = NULL;
250 * And when the system call is done, we handle it here.
251 * Currently, no attempt is made to ensure that the system calls
252 * match -- this needs to be fixed (and is, in fact, why S_SCX includes
253 * the system call number instead of, say, an error status).
257 powerpc64_syscall_exit(struct trussinfo *trussinfo, int syscall_num __unused)
265 if (fsc.name == NULL)
268 cpid = trussinfo->curthread->tid;
270 if (ptrace(PT_GETREGS, cpid, (caddr_t)®s, 0) < 0) {
271 fprintf(trussinfo->outfile, "\n");
274 retval = regs.fixreg[3];
275 errorp = !!(regs.cr & 0x10000000);
278 * This code, while simpler than the initial versions I used, could
279 * stand some significant cleaning.
284 for (i = 0; i < fsc.nargs; i++)
285 asprintf(&fsc.s_args[i], "0x%lx", fsc.args[i]);
288 * Here, we only look for arguments that have OUT masked in --
289 * otherwise, they were handled in the syscall_entry function.
291 for (i = 0; i < sc->nargs; i++) {
293 if (sc->args[i].type & OUT) {
295 * If an error occurred, than don't bothe getting the data;
296 * it may not be valid.
299 asprintf(&temp, "0x%lx", fsc.args[sc->args[i].offset]);
301 temp = print_arg(&sc->args[i], fsc.args, retval, trussinfo);
302 fsc.s_args[i] = temp;
307 if (fsc.name != NULL &&
308 (!strcmp(fsc.name, "execve") || !strcmp(fsc.name, "exit"))) {
309 trussinfo->curthread->in_syscall = 1;
314 * It would probably be a good idea to merge the error handling,
315 * but that complicates things considerably.
318 print_syscall_ret(trussinfo, fsc.name, fsc.nargs, fsc.s_args, errorp,