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.
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10 * notice, this list of conditions and the following disclaimer in the
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>
53 #include <machine/tstate.h>
72 static int nsyscalls = sizeof(syscallnames) / sizeof(syscallnames[0]);
75 * This is what this particular file uses to keep track of a system call.
76 * It is probably not quite sufficient -- I can probably use the same
77 * structure for the various syscall personalities, and I also probably
78 * need to nest system calls (for signal handlers).
80 * 'struct syscall' describes the system call; it may be NULL, however,
81 * if we don't know about this particular system call yet.
83 struct freebsd_syscall {
88 int nargs; /* number of arguments -- *not* number of words! */
89 char **s_args; /* the printable arguments */
92 static struct freebsd_syscall *
96 return (malloc(sizeof(struct freebsd_syscall)));
99 /* Clear up and free parts of the fsc structure. */
101 free_fsc(struct freebsd_syscall *fsc)
107 for (i = 0; i < fsc->nargs; i++)
108 free(fsc->s_args[i]);
115 * Called when a process has entered a system call. nargs is the
116 * number of words, not number of arguments (a necessary distinction
117 * in some cases). Note that if the STOPEVENT() code in sparc64/sparc64/trap.c
118 * is ever changed these functions need to keep up.
122 sparc64_syscall_entry(struct trussinfo *trussinfo, int nargs)
124 struct ptrace_io_desc iorequest;
126 struct freebsd_syscall *fsc;
130 int indir; /* indirect system call */
132 tid = trussinfo->curthread->tid;
134 if (ptrace(PT_GETREGS, tid, (caddr_t)®s, 0) < 0) {
135 fprintf(trussinfo->outfile, "-- CANNOT READ REGISTERS --\n");
140 * FreeBSD has two special kinds of system call redirctions --
141 * SYS_syscall, and SYS___syscall. The former is the old syscall()
142 * routine, basically; the latter is for quad-aligned arguments.
145 syscall_num = regs.r_global[1];
146 if (syscall_num == SYS_syscall || syscall_num == SYS___syscall) {
148 syscall_num = regs.r_out[0];
154 fsc->number = syscall_num;
155 fsc->name = (syscall_num < 0 || syscall_num >= nsyscalls) ?
156 NULL : syscallnames[syscall_num];
158 fprintf(trussinfo->outfile, "-- UNKNOWN SYSCALL %d --\n",
162 if (fsc->name && (trussinfo->flags & FOLLOWFORKS) &&
163 (strcmp(fsc->name, "fork") == 0 ||
164 strcmp(fsc->name, "rfork") == 0 ||
165 strcmp(fsc->name, "vfork") == 0))
166 trussinfo->curthread->in_fork = 1;
171 fsc->args = malloc((1 + nargs) * sizeof(unsigned long));
175 * The OS doesn't seem to allow more than 10 words of
176 * parameters (yay!). So we shouldn't be here.
178 warn("More than 10 words (%d) of arguments!\n", nargs);
185 * If there are 7-10 words of arguments, they are placed
186 * on the stack, as is normal for other processors.
187 * The fall-through for all of these is deliberate!!!
189 iorequest.piod_op = PIOD_READ_D;
190 iorequest.piod_offs = (void *)(regs.r_out[6] + SPOFF +
191 offsetof(struct frame, fr_pad[6]));
192 iorequest.piod_addr = &fsc->args[6];
193 iorequest.piod_len = (nargs - 6) * sizeof(fsc->args[0]);
194 ptrace(PT_IO, tid, (caddr_t)&iorequest, 0);
195 if (iorequest.piod_len == 0)
197 case 6: fsc->args[5] = regs.r_out[5];
198 case 5: fsc->args[4] = regs.r_out[4];
199 case 4: fsc->args[3] = regs.r_out[3];
200 case 3: fsc->args[2] = regs.r_out[2];
201 case 2: fsc->args[1] = regs.r_out[1];
202 case 1: fsc->args[0] = regs.r_out[0];
208 memmove(&fsc->args[0], &fsc->args[1], (nargs - 1) *
209 sizeof(fsc->args[0]));
211 sc = get_syscall(fsc->name);
213 fsc->nargs = sc->nargs;
216 fprintf(trussinfo->outfile, "unknown syscall %s -- setting "
217 "args to %d\n", fsc->name, nargs);
222 fsc->s_args = calloc(1, (1 + fsc->nargs) * sizeof(char *));
226 * At this point, we set up the system call arguments.
227 * We ignore any OUT ones, however -- those are arguments that
228 * are set by the system call, and so are probably meaningless
229 * now. This doesn't currently support arguments that are
230 * passed in *and* out, however.
235 fprintf(stderr, "syscall %s(", fsc->name);
237 for (i = 0; i < fsc->nargs; i++) {
239 fprintf(stderr, "0x%x%s", sc ?
240 fsc->args[sc->args[i].offset] : fsc->args[i],
241 i < (fsc->nargs - 1) ? "," : "");
243 if (sc && !(sc->args[i].type & OUT)) {
244 fsc->s_args[i] = print_arg(&sc->args[i],
245 fsc->args, 0, trussinfo);
249 fprintf(stderr, ")\n");
254 fprintf(trussinfo->outfile, "\n");
257 if (fsc->name != NULL && (strcmp(fsc->name, "execve") == 0 ||
258 strcmp(fsc->name, "exit") == 0)) {
261 * This could be done in a more general
262 * manner but it still wouldn't be very pretty.
264 if (strcmp(fsc->name, "execve") == 0) {
265 if ((trussinfo->flags & EXECVEARGS) == 0) {
266 if (fsc->s_args[1]) {
267 free(fsc->s_args[1]);
268 fsc->s_args[1] = NULL;
271 if ((trussinfo->flags & EXECVEENVS) == 0) {
272 if (fsc->s_args[2]) {
273 free(fsc->s_args[2]);
274 fsc->s_args[2] = NULL;
279 trussinfo->curthread->fsc = fsc;
283 * And when the system call is done, we handle it here.
284 * Currently, no attempt is made to ensure that the system calls
285 * match -- this needs to be fixed (and is, in fact, why S_SCX includes
286 * the system call number instead of, say, an error status).
290 sparc64_syscall_exit(struct trussinfo *trussinfo, int syscall_num __unused)
293 struct freebsd_syscall *fsc;
299 if (trussinfo->curthread->fsc == NULL)
302 tid = trussinfo->curthread->tid;
304 if (ptrace(PT_GETREGS, tid, (caddr_t)®s, 0) < 0) {
305 fprintf(trussinfo->outfile, "\n");
309 retval = regs.r_out[0];
310 errorp = !!(regs.r_tstate & TSTATE_XCC_C);
313 * This code, while simpler than the initial versions I used, could
314 * stand some significant cleaning.
317 fsc = trussinfo->curthread->fsc;
320 for (i = 0; i < fsc->nargs; i++)
321 asprintf(&fsc->s_args[i], "0x%lx", fsc->args[i]);
324 * Here, we only look for arguments that have OUT masked in --
325 * otherwise, they were handled in the syscall_entry function.
327 for (i = 0; i < sc->nargs; i++) {
329 if (sc->args[i].type & OUT) {
331 * If an error occurred, then don't bother
332 * getting the data; it may not be valid.
335 asprintf(&temp, "0x%lx",
336 fsc->args[sc->args[i].offset]);
338 temp = print_arg(&sc->args[i],
339 fsc->args, retval, trussinfo);
341 fsc->s_args[i] = temp;
346 if (fsc->name != NULL && (strcmp(fsc->name, "execve") == 0 ||
347 strcmp(fsc->name, "exit") == 0))
348 trussinfo->curthread->in_syscall = 1;
351 * It would probably be a good idea to merge the error handling,
352 * but that complicates things considerably.
355 print_syscall_ret(trussinfo, fsc->name, fsc->nargs, fsc->s_args, errorp,