2 * Copyright 1997 Sean Eric Fagan
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 * 3. All advertising materials mentioning features or use of this software
13 * must display the following acknowledgement:
14 * This product includes software developed by Sean Eric Fagan
15 * 4. Neither the name of the author may be used to endorse or promote
16 * products derived from this software without specific prior written
19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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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/ptrace.h>
47 #include <sys/syscall.h>
49 #include <machine/reg.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 ia64/ia64/trap.c
108 * is ever changed these functions need to keep up.
112 ia64_syscall_entry(struct trussinfo *trussinfo, int nargs) {
116 unsigned long *parm_offset;
119 cpid = trussinfo->curthread->tid;
122 if (ptrace(PT_GETREGS, cpid, (caddr_t)®s, 0) < 0) {
123 fprintf(trussinfo->outfile, "-- CANNOT READ REGISTERS --\n");
126 parm_offset = ®s.r_scratch.gr16;
129 * FreeBSD has two special kinds of system call redirctions --
130 * SYS_syscall, and SYS___syscall. The former is the old syscall()
131 * routine, basically; the latter is for quad-aligned arguments.
133 syscall_num = regs.r_scratch.gr15; /* XXX double-check. */
134 if (syscall_num == SYS_syscall || syscall_num == SYS___syscall)
135 syscall_num = (int)*parm_offset++;
137 fsc.number = syscall_num;
138 fsc.name = (syscall_num < 0 || syscall_num >= nsyscalls)
139 ? NULL : syscallnames[syscall_num];
141 fprintf(trussinfo->outfile, "-- UNKNOWN SYSCALL %d --\n", syscall_num);
144 if (fsc.name && (trussinfo->flags & FOLLOWFORKS)
145 && ((!strcmp(fsc.name, "fork")
146 || !strcmp(fsc.name, "rfork")
147 || !strcmp(fsc.name, "vfork"))))
149 trussinfo->curthread->in_fork = 1;
155 fsc.args = malloc((1+nargs) * sizeof(unsigned long));
156 memcpy(fsc.args, parm_offset, nargs * sizeof(long));
158 sc = get_syscall(fsc.name);
160 fsc.nargs = sc->nargs;
163 fprintf(trussinfo->outfile, "unknown syscall %s -- setting args to %d\n",
169 fsc.s_args = calloc(1, (1+fsc.nargs) * sizeof(char*));
173 * At this point, we set up the system call arguments.
174 * We ignore any OUT ones, however -- those are arguments that
175 * are set by the system call, and so are probably meaningless
176 * now. This doesn't currently support arguments that are
177 * passed in *and* out, however.
183 fprintf(stderr, "syscall %s(", fsc.name);
185 for (i = 0; i < fsc.nargs; i++) {
187 fprintf(stderr, "0x%x%s",
189 ? fsc.args[sc->args[i].offset]
191 i < (fsc.nargs - 1) ? "," : "");
193 if (sc && !(sc->args[i].type & OUT)) {
194 fsc.s_args[i] = print_arg(&sc->args[i], fsc.args, 0, trussinfo);
198 fprintf(stderr, ")\n");
203 fprintf(trussinfo->outfile, "\n");
206 if (fsc.name != NULL &&
207 (!strcmp(fsc.name, "execve") || !strcmp(fsc.name, "exit"))) {
210 * This could be done in a more general
211 * manner but it still wouldn't be very pretty.
213 if (!strcmp(fsc.name, "execve")) {
214 if ((trussinfo->flags & EXECVEARGS) == 0)
217 fsc.s_args[1] = NULL;
219 if ((trussinfo->flags & EXECVEENVS) == 0)
222 fsc.s_args[2] = NULL;
231 * And when the system call is done, we handle it here.
232 * Currently, no attempt is made to ensure that the system calls
233 * match -- this needs to be fixed (and is, in fact, why S_SCX includes
234 * the system call number instead of, say, an error status).
238 ia64_syscall_exit(struct trussinfo *trussinfo, int syscall_num __unused)
246 if (fsc.name == NULL)
248 cpid = trussinfo->curthread->tid;
250 if (ptrace(PT_GETREGS, cpid, (caddr_t)®s, 0) < 0) {
251 fprintf(trussinfo->outfile, "-- CANNOT READ REGISTERS --\n");
254 retval = regs.r_scratch.gr8;
255 errorp = (regs.r_scratch.gr10 != 0) ? 1 : 0;
258 * This code, while simpler than the initial versions I used, could
259 * stand some significant cleaning.
264 for (i = 0; i < fsc.nargs; i++)
265 asprintf(&fsc.s_args[i], "0x%lx", fsc.args[i]);
268 * Here, we only look for arguments that have OUT masked in --
269 * otherwise, they were handled in the syscall_entry function.
271 for (i = 0; i < sc->nargs; i++) {
273 if (sc->args[i].type & OUT) {
275 * If an error occurred, than don't bothe getting the data;
276 * it may not be valid.
279 asprintf(&temp, "0x%lx", fsc.args[sc->args[i].offset]);
281 temp = print_arg(&sc->args[i], fsc.args, retval, trussinfo);
282 fsc.s_args[i] = temp;
287 if (fsc.name != NULL &&
288 (!strcmp(fsc.name, "execve") || !strcmp(fsc.name, "exit"))) {
289 trussinfo->curthread->in_syscall = 1;
292 * It would probably be a good idea to merge the error handling,
293 * but that complicates things considerably.
296 print_syscall_ret(trussinfo, fsc.name, fsc.nargs, fsc.s_args, errorp,