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>
64 #ifdef __powerpc64__ /* 32-bit compatibility */
65 #include "freebsd32_syscalls.h"
66 #define syscallnames freebsd32_syscallnames
67 #else /* native 32-bit */
71 static int nsyscalls = sizeof(syscallnames) / sizeof(syscallnames[0]);
74 * This is what this particular file uses to keep track of a system call.
75 * It is probably not quite sufficient -- I can probably use the same
76 * structure for the various syscall personalities, and I also probably
77 * need to nest system calls (for signal handlers).
79 * 'struct syscall' describes the system call; it may be NULL, however,
80 * if we don't know about this particular system call yet.
82 struct freebsd_syscall {
87 int nargs; /* number of arguments -- *not* number of words! */
88 char **s_args; /* the printable arguments */
91 static struct freebsd_syscall *
95 return (malloc(sizeof(struct freebsd_syscall)));
98 /* Clear up and free parts of the fsc structure. */
100 free_fsc(struct freebsd_syscall *fsc)
106 for (i = 0; i < fsc->nargs; i++)
107 free(fsc->s_args[i]);
114 * Called when a process has entered a system call. nargs is the
115 * number of words, not number of arguments (a necessary distinction
116 * in some cases). Note that if the STOPEVENT() code in powerpc/powerpc/trap.c
117 * is ever changed these functions need to keep up.
121 powerpc_syscall_entry(struct trussinfo *trussinfo, int nargs)
123 struct ptrace_io_desc iorequest;
125 struct freebsd_syscall *fsc;
129 int i, regargs, syscall_num;
131 /* Account for a 64-bit argument with corresponding alignment. */
134 tid = trussinfo->curthread->tid;
136 if (ptrace(PT_GETREGS, tid, (caddr_t)®s, 0) < 0) {
137 fprintf(trussinfo->outfile, "-- CANNOT READ REGISTERS --\n");
142 * FreeBSD has two special kinds of system call redirctions --
143 * SYS_syscall, and SYS___syscall. The former is the old syscall()
144 * routine, basically; the latter is for quad-aligned arguments.
147 syscall_num = regs.fixreg[0];
148 args = ®s.fixreg[3];
149 if (syscall_num == SYS_syscall) {
150 args = ®s.fixreg[4];
152 syscall_num = regs.fixreg[3];
153 } else if (syscall_num == SYS___syscall) {
154 args = ®s.fixreg[5];
156 syscall_num = regs.fixreg[4];
162 fsc->number = syscall_num;
163 fsc->name = (syscall_num < 0 || syscall_num >= nsyscalls) ?
164 NULL : syscallnames[syscall_num];
166 fprintf(trussinfo->outfile, "-- UNKNOWN SYSCALL %d --\n",
170 if (fsc->name && (trussinfo->flags & FOLLOWFORKS) &&
171 (strcmp(fsc->name, "fork") == 0 ||
172 strcmp(fsc->name, "rfork") == 0 ||
173 strcmp(fsc->name, "vfork") == 0))
174 trussinfo->curthread->in_fork = 1;
179 fsc->args = malloc((1 + nargs) * sizeof(unsigned long));
181 if (nargs > regargs) {
182 memmove(&fsc->args[0], args, regargs * sizeof(fsc->args[0]));
184 iorequest.piod_op = PIOD_READ_D;
185 iorequest.piod_offs = (void *)(regs.fixreg[1] + 8);
186 iorequest.piod_addr = &fsc->args[regargs];
187 iorequest.piod_len = (nargs - regargs) * sizeof(fsc->args[0]);
188 ptrace(PT_IO, tid, (caddr_t)&iorequest, 0);
189 if (iorequest.piod_len == 0)
192 memmove(&fsc->args[0], args, nargs * sizeof(fsc->args[0]));
194 sc = get_syscall(fsc->name);
196 fsc->nargs = sc->nargs;
199 fprintf(trussinfo->outfile, "unknown syscall %s -- setting "
200 "args to %d\n", fsc->name, nargs);
205 fsc->s_args = calloc(1, (1 + fsc->nargs) * sizeof(char *));
209 * At this point, we set up the system call arguments.
210 * We ignore any OUT ones, however -- those are arguments that
211 * are set by the system call, and so are probably meaningless
212 * now. This doesn't currently support arguments that are
213 * passed in *and* out, however.
218 fprintf(stderr, "syscall %s(", fsc->name);
220 for (i = 0; i < fsc->nargs; i++) {
222 fprintf(stderr, "0x%x%s", sc ?
223 fsc->args[sc->args[i].offset] : fsc->args[i],
224 i < (fsc->nargs - 1) ? "," : "");
226 if (sc && !(sc->args[i].type & OUT)) {
227 fsc->s_args[i] = print_arg(&sc->args[i],
228 fsc->args, 0, trussinfo);
232 fprintf(stderr, ")\n");
237 fprintf(trussinfo->outfile, "\n");
240 if (fsc->name != NULL && (strcmp(fsc->name, "execve") == 0 ||
241 strcmp(fsc->name, "exit") == 0)) {
244 * This could be done in a more general
245 * manner but it still wouldn't be very pretty.
247 if (strcmp(fsc->name, "execve") == 0) {
248 if ((trussinfo->flags & EXECVEARGS) == 0) {
249 if (fsc->s_args[1]) {
250 free(fsc->s_args[1]);
251 fsc->s_args[1] = NULL;
254 if ((trussinfo->flags & EXECVEENVS) == 0) {
255 if (fsc->s_args[2]) {
256 free(fsc->s_args[2]);
257 fsc->s_args[2] = NULL;
262 trussinfo->curthread->fsc = fsc;
266 * And when the system call is done, we handle it here.
267 * Currently, no attempt is made to ensure that the system calls
268 * match -- this needs to be fixed (and is, in fact, why S_SCX includes
269 * the system call number instead of, say, an error status).
273 powerpc_syscall_exit(struct trussinfo *trussinfo, int syscall_num __unused)
276 struct freebsd_syscall *fsc;
282 if (trussinfo->curthread->fsc == NULL)
285 tid = trussinfo->curthread->tid;
287 if (ptrace(PT_GETREGS, tid, (caddr_t)®s, 0) < 0) {
288 fprintf(trussinfo->outfile, "\n");
292 retval = regs.fixreg[3];
293 errorp = !!(regs.cr & 0x10000000);
296 * This code, while simpler than the initial versions I used, could
297 * stand some significant cleaning.
300 fsc = trussinfo->curthread->fsc;
303 for (i = 0; i < fsc->nargs; i++)
304 asprintf(&fsc->s_args[i], "0x%lx", fsc->args[i]);
307 * On 32-bit big-endian, the low word of a 64-bit return is
308 * in the greater address. Switch to this. XXX note that
309 * print_syscall_ret can't handle 64-bit return values (llseek)
311 if (sc->ret_type == 2)
312 retval = regs.fixreg[4];
315 * Here, we only look for arguments that have OUT masked in --
316 * otherwise, they were handled in the syscall_entry function.
318 for (i = 0; i < sc->nargs; i++) {
320 if (sc->args[i].type & OUT) {
322 * If an error occurred, then don't bother
323 * getting the data; it may not be valid.
326 asprintf(&temp, "0x%lx",
327 fsc->args[sc->args[i].offset]);
329 temp = print_arg(&sc->args[i],
330 fsc->args, retval, trussinfo);
332 fsc->s_args[i] = temp;
337 if (fsc->name != NULL && (strcmp(fsc->name, "execve") == 0 ||
338 strcmp(fsc->name, "exit") == 0))
339 trussinfo->curthread->in_syscall = 1;
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,