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/sparc64-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/ptrace.h>
49 #include <sys/syscall.h>
51 #include <machine/frame.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 sparc64/sparc64/trap.c
113 * is ever changed these functions need to keep up.
117 mips_syscall_entry(struct trussinfo *trussinfo, int nargs) {
122 int indir = 0; /* indirect system call */
123 struct ptrace_io_desc iorequest;
125 cpid = trussinfo->curthread->tid;
129 if (ptrace(PT_GETREGS, cpid, (caddr_t)®s, 0) < 0) {
130 fprintf(trussinfo->outfile, "-- CANNOT READ REGISTERS --\n");
134 syscall_num = regs.r_regs[V0];
135 if (syscall_num == SYS_syscall) {
137 syscall_num = regs.r_regs[A0];
140 fsc.number = syscall_num;
142 (syscall_num < 0 || syscall_num >= nsyscalls) ? NULL : syscallnames[syscall_num];
144 fprintf(trussinfo->outfile, "-- UNKNOWN SYSCALL %d --\n", syscall_num);
147 if (fsc.name && (trussinfo->flags & FOLLOWFORKS)
148 && ((!strcmp(fsc.name, "fork")
149 || !strcmp(fsc.name, "rfork")
150 || !strcmp(fsc.name, "vfork"))))
152 trussinfo->curthread->in_fork = 1;
159 fsc.args = malloc((1+nargs) * sizeof(unsigned long));
160 iorequest.piod_op = PIOD_READ_D;
161 iorequest.piod_offs = (void *)parm_offset;
162 iorequest.piod_addr = fsc.args;
163 iorequest.piod_len = (1+nargs) * sizeof(unsigned long);
164 ptrace(PT_IO, cpid, (caddr_t)&iorequest, 0);
165 if (iorequest.piod_len == 0)
168 iorequest.piod_op = PIOD_READ_D;
174 * The OS doesn't seem to allow more than 10 words of
175 * parameters (yay!). So we shouldn't be here.
177 warn("More than 10 words (%d) of arguments!\n", nargs);
179 case 10: case 9: case 8: case 7: case 6: case 5:
181 * If there are 7-10 words of arguments, they are placed
182 * on the stack, as is normal for other processors.
183 * The fall-through for all of these is deliberate!!!
185 // XXX BAD constant used here
186 iorequest.piod_op = PIOD_READ_D;
187 iorequest.piod_offs = (void *)(regs.r_regs[SP] + 4 * sizeof(uint32_t));
188 iorequest.piod_addr = &fsc.args[4];
189 iorequest.piod_len = (nargs - 4) * sizeof(fsc.args[0]);
190 ptrace(PT_IO, cpid, (caddr_t)&iorequest, 0);
191 if (iorequest.piod_len == 0) return;
192 case 4: fsc.args[3] = regs.r_regs[A3];
193 case 3: fsc.args[2] = regs.r_regs[A2];
194 case 2: fsc.args[1] = regs.r_regs[A1];
195 case 1: fsc.args[0] = regs.r_regs[A0];
200 memmove(&fsc.args[0], &fsc.args[1], (nargs-1) * sizeof(fsc.args[0]));
203 sc = get_syscall(fsc.name);
205 fsc.nargs = sc->nargs;
208 fprintf(trussinfo->outfile, "unknown syscall %s -- setting args to %d\n",
214 fsc.s_args = calloc(1, (1+fsc.nargs) * sizeof(char*));
218 * At this point, we set up the system call arguments.
219 * We ignore any OUT ones, however -- those are arguments that
220 * are set by the system call, and so are probably meaningless
221 * now. This doesn't currently support arguments that are
222 * passed in *and* out, however.
228 fprintf(stderr, "syscall %s(", fsc.name);
230 for (i = 0; i < fsc.nargs; i++) {
232 fprintf(stderr, "0x%x%s",
234 ? fsc.args[sc->args[i].offset]
236 i < (fsc.nargs - 1) ? "," : "");
238 if (sc && !(sc->args[i].type & OUT)) {
239 fsc.s_args[i] = print_arg(&sc->args[i], fsc.args, 0, trussinfo);
243 fprintf(stderr, ")\n");
248 fprintf(trussinfo->outfile, "\n");
251 if (fsc.name != NULL &&
252 (!strcmp(fsc.name, "execve") || !strcmp(fsc.name, "exit"))) {
255 * This could be done in a more general
256 * manner but it still wouldn't be very pretty.
258 if (!strcmp(fsc.name, "execve")) {
259 if ((trussinfo->flags & EXECVEARGS) == 0)
262 fsc.s_args[1] = NULL;
264 if ((trussinfo->flags & EXECVEENVS) == 0)
267 fsc.s_args[2] = NULL;
276 * And when the system call is done, we handle it here.
277 * Currently, no attempt is made to ensure that the system calls
278 * match -- this needs to be fixed (and is, in fact, why S_SCX includes
279 * the sytem call number instead of, say, an error status).
283 mips_syscall_exit(struct trussinfo *trussinfo, int syscall_num __unused) {
290 if (fsc.name == NULL)
292 cpid = trussinfo->curthread->tid;
294 if (ptrace(PT_GETREGS, cpid, (caddr_t)®s, 0) < 0) {
295 fprintf(trussinfo->outfile, "\n");
298 retval = regs.r_regs[V0];
299 errorp = !!regs.r_regs[A3];
302 * This code, while simpler than the initial versions I used, could
303 * stand some significant cleaning.
308 for (i = 0; i < fsc.nargs; i++)
309 asprintf(&fsc.s_args[i], "0x%lx", fsc.args[i]);
312 * Here, we only look for arguments that have OUT masked in --
313 * otherwise, they were handled in the syscall_entry function.
315 for (i = 0; i < sc->nargs; i++) {
317 if (sc->args[i].type & OUT) {
319 * If an error occurred, than don't bothe getting the data;
320 * it may not be valid.
323 asprintf(&temp, "0x%lx", fsc.args[sc->args[i].offset]);
325 temp = print_arg(&sc->args[i], fsc.args, retval, trussinfo);
326 fsc.s_args[i] = temp;
331 if (fsc.name != NULL &&
332 (!strcmp(fsc.name, "execve") || !strcmp(fsc.name, "exit"))) {
333 trussinfo->curthread->in_syscall = 1;
336 * It would probably be a good idea to merge the error handling,
337 * but that complicates things considerably.
340 print_syscall_ret(trussinfo, fsc.name, fsc.nargs, fsc.s_args, errorp,