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
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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>
66 #ifdef __powerpc64__ /* 32-bit compatibility */
67 #include "freebsd32_syscalls.h"
68 #define syscallnames freebsd32_syscallnames
69 #else /* native 32-bit */
73 static int nsyscalls = sizeof(syscallnames) / sizeof(syscallnames[0]);
76 * This is what this particular file uses to keep track of a system call.
77 * It is probably not quite sufficient -- I can probably use the same
78 * structure for the various syscall personalities, and I also probably
79 * need to nest system calls (for signal handlers).
81 * 'struct syscall' describes the system call; it may be NULL, however,
82 * if we don't know about this particular system call yet.
84 static struct freebsd_syscall {
89 int nargs; /* number of arguments -- *not* number of words! */
90 char **s_args; /* the printable arguments */
93 /* Clear up and free parts of the fsc structure. */
101 for (i = 0; i < fsc.nargs; i++)
106 memset(&fsc, 0, sizeof(fsc));
110 * Called when a process has entered a system call. nargs is the
111 * number of words, not number of arguments (a necessary distinction
112 * in some cases). Note that if the STOPEVENT() code in powerpc/powerpc/trap.c
113 * is ever changed these functions need to keep up.
117 powerpc_syscall_entry(struct trussinfo *trussinfo, int nargs) {
123 unsigned int regargs;
126 /* Account for a 64-bit argument with corresponding alignment. */
129 cpid = trussinfo->curthread->tid;
132 if (ptrace(PT_GETREGS, cpid, (caddr_t)®s, 0) < 0) {
133 fprintf(trussinfo->outfile, "-- CANNOT READ REGISTERS --\n");
138 * FreeBSD has two special kinds of system call redirctions --
139 * SYS_syscall, and SYS___syscall. The former is the old syscall()
140 * routine, basically; the latter is for quad-aligned arguments.
143 syscall_num = regs.fixreg[0];
144 args = ®s.fixreg[3];
145 if (syscall_num == SYS_syscall) {
146 args = ®s.fixreg[4];
148 syscall_num = regs.fixreg[3];
149 } else if (syscall_num == SYS___syscall) {
150 args = ®s.fixreg[5];
152 syscall_num = regs.fixreg[4];
155 fsc.number = syscall_num;
157 (syscall_num < 0 || syscall_num >= nsyscalls) ? NULL : syscallnames[syscall_num];
159 fprintf(trussinfo->outfile, "-- UNKNOWN SYSCALL %d --\n", syscall_num);
162 if (fsc.name && (trussinfo->flags & FOLLOWFORKS)
163 && ((!strcmp(fsc.name, "fork")
164 || !strcmp(fsc.name, "rfork")
165 || !strcmp(fsc.name, "vfork"))))
167 trussinfo->curthread->in_fork = 1;
173 fsc.args = malloc((1+nargs) * sizeof(unsigned long));
175 if (nargs > regargs) {
176 struct ptrace_io_desc iorequest;
177 memmove(&fsc.args[0], args, regargs * sizeof(fsc.args[0]));
179 iorequest.piod_op = PIOD_READ_D;
180 iorequest.piod_offs = (void *)(regs.fixreg[1] + 8);
181 iorequest.piod_addr = &fsc.args[regargs];
182 iorequest.piod_len = (nargs - regargs) * sizeof(fsc.args[0]);
183 ptrace(PT_IO, cpid, (caddr_t)&iorequest, 0);
184 if (iorequest.piod_len == 0)
187 memmove(&fsc.args[0], args, nargs * sizeof(fsc.args[0]));
190 sc = get_syscall(fsc.name);
192 fsc.nargs = sc->nargs;
195 fprintf(trussinfo->outfile, "unknown syscall %s -- setting args to %d\n",
201 fsc.s_args = calloc(1, (1+fsc.nargs) * sizeof(char*));
205 * At this point, we set up the system call arguments.
206 * We ignore any OUT ones, however -- those are arguments that
207 * are set by the system call, and so are probably meaningless
208 * now. This doesn't currently support arguments that are
209 * passed in *and* out, however.
215 fprintf(stderr, "syscall %s(", fsc.name);
217 for (i = 0; i < fsc.nargs; i++) {
219 fprintf(stderr, "0x%x%s",
221 ? fsc.args[sc->args[i].offset]
223 i < (fsc.nargs - 1) ? "," : "");
225 if (sc && !(sc->args[i].type & OUT)) {
226 fsc.s_args[i] = print_arg(&sc->args[i], fsc.args, 0, trussinfo);
230 fprintf(stderr, ")\n");
235 fprintf(trussinfo->outfile, "\n");
238 if (fsc.name && (!strcmp(fsc.name, "execve") || !strcmp(fsc.name, "exit"))) {
241 * This could be done in a more general
242 * manner but it still wouldn't be very pretty.
244 if (!strcmp(fsc.name, "execve")) {
245 if ((trussinfo->flags & EXECVEARGS) == 0)
248 fsc.s_args[1] = NULL;
250 if ((trussinfo->flags & EXECVEENVS) == 0)
253 fsc.s_args[2] = NULL;
262 * And when the system call is done, we handle it here.
263 * Currently, no attempt is made to ensure that the system calls
264 * match -- this needs to be fixed (and is, in fact, why S_SCX includes
265 * the system call number instead of, say, an error status).
269 powerpc_syscall_exit(struct trussinfo *trussinfo, int syscall_num __unused)
277 if (fsc.name == NULL)
280 cpid = trussinfo->curthread->tid;
282 if (ptrace(PT_GETREGS, cpid, (caddr_t)®s, 0) < 0) {
283 fprintf(trussinfo->outfile, "\n");
286 retval = regs.fixreg[3];
287 errorp = !!(regs.cr & 0x10000000);
290 * This code, while simpler than the initial versions I used, could
291 * stand some significant cleaning.
296 for (i = 0; i < fsc.nargs; i++)
297 asprintf(&fsc.s_args[i], "0x%lx", fsc.args[i]);
300 * On 32-bit big-endian, the low word of a 64-bit return is
301 * in the greater address. Switch to this. XXX note that
302 * print_syscall_ret can't handle 64-bit return values (llseek)
304 if (sc->ret_type == 2)
305 retval = regs.fixreg[4];
308 * Here, we only look for arguments that have OUT masked in --
309 * otherwise, they were handled in the syscall_entry function.
311 for (i = 0; i < sc->nargs; i++) {
313 if (sc->args[i].type & OUT) {
315 * If an error occurred, than don't bothe getting the data;
316 * it may not be valid.
319 asprintf(&temp, "0x%lx", fsc.args[sc->args[i].offset]);
321 temp = print_arg(&sc->args[i], fsc.args, retval, trussinfo);
322 fsc.s_args[i] = temp;
327 if (fsc.name != NULL &&
328 (!strcmp(fsc.name, "execve") || !strcmp(fsc.name, "exit"))) {
329 trussinfo->curthread->in_syscall = 1;
334 * It would probably be a good idea to merge the error handling,
335 * but that complicates things considerably.
338 print_syscall_ret(trussinfo, fsc.name, fsc.nargs, fsc.s_args, errorp,