2 * Copryight 1997 Sean Eric Fagan
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5 * modification, are permitted provided that the following conditions
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13 * must display the following acknowledgement:
14 * This product includes software developed by Sean Eric Fagan
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33 static const char rcsid[] =
38 * FreeBSD/ia64-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.
45 #include <sys/types.h>
46 #include <sys/ioctl.h>
47 #include <sys/pioctl.h>
48 #include <sys/syscall.h>
50 #include <machine/reg.h>
70 static int nsyscalls = sizeof(syscallnames) / sizeof(syscallnames[0]);
73 * This is what this particular file uses to keep track of a system call.
74 * It is probably not quite sufficient -- I can probably use the same
75 * structure for the various syscall personalities, and I also probably
76 * need to nest system calls (for signal handlers).
78 * 'struct syscall' describes the system call; it may be NULL, however,
79 * if we don't know about this particular system call yet.
81 static struct freebsd_syscall {
86 int nargs; /* number of arguments -- *not* number of words! */
87 char **s_args; /* the printable arguments */
90 /* Clear up and free parts of the fsc structure. */
98 for (i = 0; i < fsc.nargs; i++)
103 memset(&fsc, 0, sizeof(fsc));
107 * Called when a process has entered a system call. nargs is the
108 * number of words, not number of arguments (a necessary distinction
109 * in some cases). Note that if the STOPEVENT() code in ia64/ia64/trap.c
110 * is ever changed these functions need to keep up.
114 ia64_syscall_entry(struct trussinfo *trussinfo, int nargs) {
119 unsigned long *parm_offset;
122 if (fd == -1 || trussinfo->pid != cpid) {
123 sprintf(buf, "/proc/%d/regs", trussinfo->pid);
124 fd = open(buf, O_RDWR);
126 fprintf(trussinfo->outfile, "-- CANNOT OPEN REGISTERS --\n");
129 cpid = trussinfo->pid;
134 if (read(fd, ®s, sizeof(regs)) != sizeof(regs)) {
135 fprintf(trussinfo->outfile, "-- CANNOT READ REGISTERS --\n");
138 parm_offset = ®s.r_scratch.gr16;
141 * FreeBSD has two special kinds of system call redirctions --
142 * SYS_syscall, and SYS___syscall. The former is the old syscall()
143 * routine, basicly; the latter is for quad-aligned arguments.
145 syscall_num = regs.r_scratch.gr15; /* XXX double-check. */
146 if (syscall_num == SYS_syscall || syscall_num == SYS___syscall)
147 syscall_num = (int)*parm_offset++;
149 fsc.number = syscall_num;
150 fsc.name = (syscall_num < 0 || syscall_num > nsyscalls)
151 ? NULL : syscallnames[syscall_num];
153 fprintf(trussinfo->outfile, "-- UNKNOWN SYSCALL %d --\n", syscall_num);
156 if (fsc.name && (trussinfo->flags & FOLLOWFORKS)
157 && ((!strcmp(fsc.name, "fork")
158 || !strcmp(fsc.name, "rfork")
159 || !strcmp(fsc.name, "vfork"))))
161 trussinfo->in_fork = 1;
167 fsc.args = malloc((1+nargs) * sizeof(unsigned long));
168 memcpy(fsc.args, parm_offset, nargs * sizeof(long));
170 sc = get_syscall(fsc.name);
172 fsc.nargs = sc->nargs;
175 fprintf(trussinfo->outfile, "unknown syscall %s -- setting args to %d\n",
181 fsc.s_args = malloc((1+fsc.nargs) * sizeof(char*));
182 memset(fsc.s_args, 0, fsc.nargs * sizeof(char*));
186 * At this point, we set up the system call arguments.
187 * We ignore any OUT ones, however -- those are arguments that
188 * are set by the system call, and so are probably meaningless
189 * now. This doesn't currently support arguments that are
190 * passed in *and* out, however.
196 fprintf(stderr, "syscall %s(", fsc.name);
198 for (i = 0; i < fsc.nargs; i++) {
200 fprintf(stderr, "0x%x%s",
202 ? fsc.args[sc->args[i].offset]
204 i < (fsc.nargs - 1) ? "," : "");
206 if (sc && !(sc->args[i].type & OUT)) {
207 fsc.s_args[i] = print_arg(Procfd, &sc->args[i], fsc.args, 0, trussinfo);
211 fprintf(stderr, ")\n");
216 fprintf(trussinfo->outfile, "\n");
220 * Some system calls should be printed out before they are done --
221 * execve() and exit(), for example, never return. Possibly change
222 * this to work for any system call that doesn't have an OUT
226 if (fsc.name != NULL &&
227 (!strcmp(fsc.name, "execve") || !strcmp(fsc.name, "exit"))) {
230 * This could be done in a more general
231 * manner but it still wouldn't be very pretty.
233 if (!strcmp(fsc.name, "execve")) {
234 if ((trussinfo->flags & EXECVEARGS) == 0)
237 fsc.s_args[1] = NULL;
239 if ((trussinfo->flags & EXECVEENVS) == 0)
242 fsc.s_args[2] = NULL;
246 print_syscall(trussinfo, fsc.name, fsc.nargs, fsc.s_args);
247 fprintf(trussinfo->outfile, "\n");
254 * And when the system call is done, we handle it here.
255 * Currently, no attempt is made to ensure that the system calls
256 * match -- this needs to be fixed (and is, in fact, why S_SCX includes
257 * the sytem call number instead of, say, an error status).
261 ia64_syscall_exit(struct trussinfo *trussinfo, int syscall_num __unused)
270 if (fd == -1 || trussinfo->pid != cpid) {
271 sprintf(buf, "/proc/%d/regs", trussinfo->pid);
272 fd = open(buf, O_RDONLY);
274 fprintf(trussinfo->outfile, "-- CANNOT OPEN REGISTERS --\n");
277 cpid = trussinfo->pid;
281 if (read(fd, ®s, sizeof(regs)) != sizeof(regs)) {
282 fprintf(trussinfo->outfile, "-- CANNOT READ REGISTERS --\n");
285 retval = regs.r_scratch.gr8;
286 errorp = (regs.r_scratch.gr10 != 0) ? 1 : 0;
289 * This code, while simpler than the initial versions I used, could
290 * stand some significant cleaning.
295 for (i = 0; i < fsc.nargs; i++)
296 asprintf(&fsc.s_args[i], "0x%lx", fsc.args[i]);
299 * Here, we only look for arguments that have OUT masked in --
300 * otherwise, they were handled in the syscall_entry function.
302 for (i = 0; i < sc->nargs; i++) {
304 if (sc->args[i].type & OUT) {
306 * If an error occurred, than don't bothe getting the data;
307 * it may not be valid.
310 asprintf(&temp, "0x%lx", fsc.args[sc->args[i].offset]);
312 temp = print_arg(Procfd, &sc->args[i], fsc.args, retval, trussinfo);
313 fsc.s_args[i] = temp;
319 * It would probably be a good idea to merge the error handling,
320 * but that complicates things considerably.
323 print_syscall_ret(trussinfo, fsc.name, fsc.nargs, fsc.s_args, errorp, retval);