2 * Copyright 1998 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
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11 * documentation and/or other materials provided with the distribution.
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13 * must display the following acknowledgement:
14 * This product includes software developed by Sean Eric Fagan
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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/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>
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 sparc64/sparc64/trap.c
117 * is ever changed these functions need to keep up.
121 mips_syscall_entry(struct trussinfo *trussinfo, int nargs)
123 struct ptrace_io_desc iorequest;
125 struct freebsd_syscall *fsc;
129 int indir; /* indirect system call */
131 tid = trussinfo->curthread->tid;
133 if (ptrace(PT_GETREGS, tid, (caddr_t)®s, 0) < 0) {
134 fprintf(trussinfo->outfile, "-- CANNOT READ REGISTERS --\n");
139 syscall_num = regs.r_regs[V0];
140 if (syscall_num == SYS_syscall) {
142 syscall_num = regs.r_regs[A0];
148 fsc->number = syscall_num;
149 fsc->name = (syscall_num < 0 || syscall_num >= nsyscalls) ?
150 NULL : syscallnames[syscall_num];
152 fprintf(trussinfo->outfile, "-- UNKNOWN SYSCALL %d --\n",
156 if (fsc->name && (trussinfo->flags & FOLLOWFORKS) &&
157 (strcmp(fsc->name, "fork") == 0 ||
158 strcmp(fsc->name, "rfork") == 0 ||
159 strcmp(fsc->name, "vfork") == 0))
160 trussinfo->curthread->in_fork = 1;
165 fsc->args = malloc((1 + nargs) * sizeof(unsigned long));
167 iorequest.piod_op = PIOD_READ_D;
168 iorequest.piod_offs = (void *)parm_offset;
169 iorequest.piod_addr = fsc->args;
170 iorequest.piod_len = (1 + nargs) * sizeof(unsigned long);
171 ptrace(PT_IO, tid, (caddr_t)&iorequest, 0);
172 if (iorequest.piod_len == 0)
175 iorequest.piod_op = PIOD_READ_D;
181 * The OS doesn't seem to allow more than 10 words of
182 * parameters (yay!). So we shouldn't be here.
184 warn("More than 10 words (%d) of arguments!\n", nargs);
193 * If there are 7-10 words of arguments, they are placed
194 * on the stack, as is normal for other processors.
195 * The fall-through for all of these is deliberate!!!
197 // XXX BAD constant used here
198 iorequest.piod_op = PIOD_READ_D;
199 iorequest.piod_offs = (void *)(regs.r_regs[SP] +
200 4 * sizeof(uint32_t));
201 iorequest.piod_addr = &fsc->args[4];
202 iorequest.piod_len = (nargs - 4) * sizeof(fsc->args[0]);
203 ptrace(PT_IO, tid, (caddr_t)&iorequest, 0);
204 if (iorequest.piod_len == 0)
206 case 4: fsc->args[3] = regs.r_regs[A3];
207 case 3: fsc->args[2] = regs.r_regs[A2];
208 case 2: fsc->args[1] = regs.r_regs[A1];
209 case 1: fsc->args[0] = regs.r_regs[A0];
213 memmove(&fsc->args[0], &fsc->args[1],
214 (nargs - 1) * sizeof(fsc->args[0]));
217 sc = get_syscall(fsc->name);
219 fsc->nargs = sc->nargs;
222 fprintf(trussinfo->outfile, "unknown syscall %s -- setting "
223 "args to %d\n", fsc->name, nargs);
228 fsc->s_args = calloc(1, (1 + fsc->nargs) * sizeof(char *));
232 * At this point, we set up the system call arguments.
233 * We ignore any OUT ones, however -- those are arguments that
234 * are set by the system call, and so are probably meaningless
235 * now. This doesn't currently support arguments that are
236 * passed in *and* out, however.
241 fprintf(stderr, "syscall %s(", fsc->name);
243 for (i = 0; i < fsc->nargs; i++) {
245 fprintf(stderr, "0x%x%s", sc ?
246 fsc->args[sc->args[i].offset] : fsc->args[i],
247 i < (fsc->nargs - 1) ? "," : "");
249 if (sc && !(sc->args[i].type & OUT)) {
250 fsc->s_args[i] = print_arg(&sc->args[i],
251 fsc->args, 0, trussinfo);
255 fprintf(stderr, ")\n");
260 fprintf(trussinfo->outfile, "\n");
263 if (fsc->name != NULL && (strcmp(fsc->name, "execve") == 0 ||
264 strcmp(fsc->name, "exit") == 0)) {
267 * This could be done in a more general
268 * manner but it still wouldn't be very pretty.
270 if (strcmp(fsc->name, "execve") == 0) {
271 if ((trussinfo->flags & EXECVEARGS) == 0) {
272 if (fsc->s_args[1]) {
273 free(fsc->s_args[1]);
274 fsc->s_args[1] = NULL;
277 if ((trussinfo->flags & EXECVEENVS) == 0) {
278 if (fsc->s_args[2]) {
279 free(fsc->s_args[2]);
280 fsc->s_args[2] = NULL;
285 trussinfo->curthread->fsc = fsc;
289 * And when the system call is done, we handle it here.
290 * Currently, no attempt is made to ensure that the system calls
291 * match -- this needs to be fixed (and is, in fact, why S_SCX includes
292 * the system call number instead of, say, an error status).
296 mips_syscall_exit(struct trussinfo *trussinfo, int syscall_num __unused)
299 struct freebsd_syscall *fsc;
305 if (trussinfo->curthread->fsc == NULL)
308 tid = trussinfo->curthread->tid;
310 if (ptrace(PT_GETREGS, tid, (caddr_t)®s, 0) < 0) {
311 fprintf(trussinfo->outfile, "\n");
315 retval = regs.r_regs[V0];
316 errorp = !!regs.r_regs[A3];
319 * This code, while simpler than the initial versions I used, could
320 * stand some significant cleaning.
323 fsc = trussinfo->curthread->fsc;
326 for (i = 0; i < fsc->nargs; i++)
327 asprintf(&fsc->s_args[i], "0x%lx", fsc->args[i]);
330 * Here, we only look for arguments that have OUT masked in --
331 * otherwise, they were handled in the syscall_entry function.
333 for (i = 0; i < sc->nargs; i++) {
335 if (sc->args[i].type & OUT) {
337 * If an error occurred, then don't bother
338 * getting the data; it may not be valid.
341 asprintf(&temp, "0x%lx",
342 fsc->args[sc->args[i].offset]);
344 temp = print_arg(&sc->args[i],
345 fsc->args, retval, trussinfo);
347 fsc->s_args[i] = temp;
352 if (fsc->name != NULL && (strcmp(fsc->name, "execve") == 0 ||
353 strcmp(fsc->name, "exit") == 0))
354 trussinfo->curthread->in_syscall = 1;
357 * It would probably be a good idea to merge the error handling,
358 * but that complicates things considerably.
361 print_syscall_ret(trussinfo, fsc->name, fsc->nargs, fsc->s_args, errorp,