2 * Copryight 1998 Sean Eric Fagan
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14 * This product includes software developed by Sean Eric Fagan
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33 static const char rcsid[] =
38 * FreeBSD/alpha-specific system call handling. This is probably the most
39 * complex part of the entire truss program, although I've got lots of
40 * it handled relatively cleanly now. The system call names are generated
41 * automatically, thanks to /usr/src/sys/kern/syscalls.master. The
42 * names used for the various structures are confusing, I sadly admit.
44 * This file is almost nothing more than a slightly-edited i386-fbsd.c.
47 #include <sys/types.h>
48 #include <sys/ioctl.h>
49 #include <sys/pioctl.h>
50 #include <sys/syscall.h>
52 #include <machine/reg.h>
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 alpha/alpha/trap.c
113 * is ever changed these functions need to keep up.
117 alpha_syscall_entry(struct trussinfo *trussinfo, int nargs) {
122 unsigned int parm_offset;
124 int indir = 0; /* indirect system call */
126 if (fd == -1 || trussinfo->pid != cpid) {
127 sprintf(buf, "/proc/%d/regs", trussinfo->pid);
128 fd = open(buf, O_RDWR);
130 fprintf(trussinfo->outfile, "-- CANNOT OPEN REGISTERS --\n");
133 cpid = trussinfo->pid;
138 if (read(fd, ®s, sizeof(regs)) != sizeof(regs)) {
139 fprintf(trussinfo->outfile, "-- CANNOT READ REGISTERS --\n");
142 parm_offset = regs.r_regs[R_SP] + sizeof(int);
145 * FreeBSD has two special kinds of system call redirctions --
146 * SYS_syscall, and SYS___syscall. The former is the old syscall()
147 * routine, basicly; the latter is for quad-aligned arguments.
149 syscall_num = regs.r_regs[R_V0];
150 if (syscall_num == SYS_syscall || syscall_num == SYS___syscall) {
152 syscall_num = regs.r_regs[R_A0];
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->in_fork = 1;
173 fsc.args = malloc((1+nargs) * sizeof(unsigned long));
177 * The OS doesn't seem to allow more than 10 words of
178 * parameters (yay!). So we shouldn't be here.
180 warn("More than 10 words (%d) of arguments!\n", nargs);
182 case 10: case 9: case 8: case 7:
184 * If there are 7-10 words of arguments, they are placed
185 * on the stack, as is normal for other processors.
186 * The fall-through for all of these is deliberate!!!
188 lseek(Procfd, regs.r_regs[R_SP], SEEK_SET);
189 read(fd, &fsc.args[6], (nargs - 6) * sizeof(fsc.args[0]));
190 case 6: fsc.args[5] = regs.r_regs[R_A5];
191 case 5: fsc.args[4] = regs.r_regs[R_A4];
192 case 4: fsc.args[3] = regs.r_regs[R_A3];
193 case 3: fsc.args[2] = regs.r_regs[R_A2];
194 case 2: fsc.args[1] = regs.r_regs[R_A1];
195 case 1: fsc.args[0] = regs.r_regs[R_A0];
201 memmove(&fsc.args[0], &fsc.args[1], (nargs-1) * sizeof(fsc.args[0]));
204 sc = get_syscall(fsc.name);
206 fsc.nargs = sc->nargs;
209 fprintf(trussinfo->outfile, "unknown syscall %s -- setting args to %d\n",
215 fsc.s_args = malloc((1+fsc.nargs) * sizeof(char*));
216 memset(fsc.s_args, 0, fsc.nargs * sizeof(char*));
220 * At this point, we set up the system call arguments.
221 * We ignore any OUT ones, however -- those are arguments that
222 * are set by the system call, and so are probably meaningless
223 * now. This doesn't currently support arguments that are
224 * passed in *and* out, however.
230 fprintf(stderr, "syscall %s(", fsc.name);
232 for (i = 0; i < fsc.nargs; i++) {
234 fprintf(stderr, "0x%x%s",
236 ? fsc.args[sc->args[i].offset]
238 i < (fsc.nargs - 1) ? "," : "");
240 if (sc && !(sc->args[i].type & OUT)) {
241 fsc.s_args[i] = print_arg(Procfd, &sc->args[i], fsc.args, 0, trussinfo);
245 fprintf(stderr, ")\n");
250 fprintf(trussinfo->outfile, "\n");
254 * Some system calls should be printed out before they are done --
255 * execve() and exit(), for example, never return. Possibly change
256 * this to work for any system call that doesn't have an OUT
260 if (!strcmp(fsc.name, "execve") || !strcmp(fsc.name, "exit")) {
263 * This could be done in a more general
264 * manner but it still wouldn't be very pretty.
266 if (!strcmp(fsc.name, "execve")) {
267 if ((trussinfo->flags & EXECVEARGS) == 0)
270 fsc.s_args[1] = NULL;
272 if ((trussinfo->flags & EXECVEENVS) == 0)
275 fsc.s_args[2] = NULL;
279 print_syscall(trussinfo, fsc.name, fsc.nargs, fsc.s_args);
280 fprintf(trussinfo->outfile, "\n");
287 * And when the system call is done, we handle it here.
288 * Currently, no attempt is made to ensure that the system calls
289 * match -- this needs to be fixed (and is, in fact, why S_SCX includes
290 * the sytem call number instead of, say, an error status).
294 alpha_syscall_exit(struct trussinfo *trussinfo, int syscall_num __unused)
303 if (fd == -1 || trussinfo->pid != cpid) {
304 sprintf(buf, "/proc/%d/regs", trussinfo->pid);
305 fd = open(buf, O_RDONLY);
307 fprintf(trussinfo->outfile, "-- CANNOT OPEN REGISTERS --\n");
310 cpid = trussinfo->pid;
314 if (read(fd, ®s, sizeof(regs)) != sizeof(regs)) {
315 fprintf(trussinfo->outfile, "\n");
318 retval = regs.r_regs[R_V0];
319 errorp = !!(regs.r_regs[R_A3]);
322 * This code, while simpler than the initial versions I used, could
323 * stand some significant cleaning.
328 for (i = 0; i < fsc.nargs; i++)
329 asprintf(&fsc.s_args[i], "0x%lx", fsc.args[i]);
332 * Here, we only look for arguments that have OUT masked in --
333 * otherwise, they were handled in the syscall_entry function.
335 for (i = 0; i < sc->nargs; i++) {
337 if (sc->args[i].type & OUT) {
339 * If an error occurred, than don't bothe getting the data;
340 * it may not be valid.
343 asprintf(&temp, "0x%lx", fsc.args[sc->args[i].offset]);
345 temp = print_arg(Procfd, &sc->args[i], fsc.args, retval, trussinfo);
346 fsc.s_args[i] = temp;
352 * It would probably be a good idea to merge the error handling,
353 * but that complicates things considerably.
356 print_syscall_ret(trussinfo, fsc.name, fsc.nargs, fsc.s_args, errorp, retval);