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
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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/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>
74 static int nsyscalls = sizeof(syscallnames) / sizeof(syscallnames[0]);
77 * This is what this particular file uses to keep track of a system call.
78 * It is probably not quite sufficient -- I can probably use the same
79 * structure for the various syscall personalities, and I also probably
80 * need to nest system calls (for signal handlers).
82 * 'struct syscall' describes the system call; it may be NULL, however,
83 * if we don't know about this particular system call yet.
85 static struct freebsd_syscall {
90 int nargs; /* number of arguments -- *not* number of words! */
91 char **s_args; /* the printable arguments */
94 /* Clear up and free parts of the fsc structure. */
102 for (i = 0; i < fsc.nargs; i++)
107 memset(&fsc, 0, sizeof(fsc));
111 * Called when a process has entered a system call. nargs is the
112 * number of words, not number of arguments (a necessary distinction
113 * in some cases). Note that if the STOPEVENT() code in sparc64/sparc64/trap.c
114 * is ever changed these functions need to keep up.
118 sparc64_syscall_entry(struct trussinfo *trussinfo, int nargs) {
123 int indir = 0; /* indirect system call */
124 struct ptrace_io_desc iorequest;
126 cpid = trussinfo->curthread->tid;
130 if (ptrace(PT_GETREGS, cpid, (caddr_t)®s, 0) < 0) {
131 fprintf(trussinfo->outfile, "-- CANNOT READ REGISTERS --\n");
136 * FreeBSD has two special kinds of system call redirctions --
137 * SYS_syscall, and SYS___syscall. The former is the old syscall()
138 * routine, basically; the latter is for quad-aligned arguments.
140 syscall_num = regs.r_global[1];
141 if (syscall_num == SYS_syscall || syscall_num == SYS___syscall) {
143 syscall_num = regs.r_out[0];
146 fsc.number = syscall_num;
148 (syscall_num < 0 || syscall_num >= nsyscalls) ? NULL : syscallnames[syscall_num];
150 fprintf(trussinfo->outfile, "-- UNKNOWN SYSCALL %d --\n", syscall_num);
153 if (fsc.name && (trussinfo->flags & FOLLOWFORKS)
154 && ((!strcmp(fsc.name, "fork")
155 || !strcmp(fsc.name, "rfork")
156 || !strcmp(fsc.name, "vfork"))))
158 trussinfo->curthread->in_fork = 1;
164 fsc.args = malloc((1+nargs) * sizeof(unsigned long));
168 * The OS doesn't seem to allow more than 10 words of
169 * parameters (yay!). So we shouldn't be here.
171 warn("More than 10 words (%d) of arguments!\n", nargs);
173 case 10: case 9: case 8: case 7:
175 * If there are 7-10 words of arguments, they are placed
176 * on the stack, as is normal for other processors.
177 * The fall-through for all of these is deliberate!!!
179 iorequest.piod_op = PIOD_READ_D;
180 iorequest.piod_offs = (void *)(regs.r_out[6] + SPOFF +
181 offsetof(struct frame, fr_pad[6]));
182 iorequest.piod_addr = &fsc.args[6];
183 iorequest.piod_len = (nargs - 6) * sizeof(fsc.args[0]);
184 ptrace(PT_IO, cpid, (caddr_t)&iorequest, 0);
185 if (iorequest.piod_len == 0) return;
187 case 6: fsc.args[5] = regs.r_out[5];
188 case 5: fsc.args[4] = regs.r_out[4];
189 case 4: fsc.args[3] = regs.r_out[3];
190 case 3: fsc.args[2] = regs.r_out[2];
191 case 2: fsc.args[1] = regs.r_out[1];
192 case 1: fsc.args[0] = regs.r_out[0];
198 memmove(&fsc.args[0], &fsc.args[1], (nargs-1) * sizeof(fsc.args[0]));
201 sc = get_syscall(fsc.name);
203 fsc.nargs = sc->nargs;
206 fprintf(trussinfo->outfile, "unknown syscall %s -- setting args to %d\n",
212 fsc.s_args = calloc(1, (1+fsc.nargs) * sizeof(char*));
216 * At this point, we set up the system call arguments.
217 * We ignore any OUT ones, however -- those are arguments that
218 * are set by the system call, and so are probably meaningless
219 * now. This doesn't currently support arguments that are
220 * passed in *and* out, however.
226 fprintf(stderr, "syscall %s(", fsc.name);
228 for (i = 0; i < fsc.nargs; i++) {
230 fprintf(stderr, "0x%x%s",
232 ? fsc.args[sc->args[i].offset]
234 i < (fsc.nargs - 1) ? "," : "");
236 if (sc && !(sc->args[i].type & OUT)) {
237 fsc.s_args[i] = print_arg(&sc->args[i], fsc.args, 0, trussinfo);
241 fprintf(stderr, ")\n");
246 fprintf(trussinfo->outfile, "\n");
249 if (fsc.name != NULL &&
250 (!strcmp(fsc.name, "execve") || !strcmp(fsc.name, "exit"))) {
253 * This could be done in a more general
254 * manner but it still wouldn't be very pretty.
256 if (!strcmp(fsc.name, "execve")) {
257 if ((trussinfo->flags & EXECVEARGS) == 0)
260 fsc.s_args[1] = NULL;
262 if ((trussinfo->flags & EXECVEENVS) == 0)
265 fsc.s_args[2] = NULL;
274 * And when the system call is done, we handle it here.
275 * Currently, no attempt is made to ensure that the system calls
276 * match -- this needs to be fixed (and is, in fact, why S_SCX includes
277 * the system call number instead of, say, an error status).
281 sparc64_syscall_exit(struct trussinfo *trussinfo, int syscall_num __unused) {
288 if (fsc.name == NULL)
290 cpid = trussinfo->curthread->tid;
292 if (ptrace(PT_GETREGS, cpid, (caddr_t)®s, 0) < 0) {
293 fprintf(trussinfo->outfile, "\n");
296 retval = regs.r_out[0];
297 errorp = !!(regs.r_tstate & TSTATE_XCC_C);
300 * This code, while simpler than the initial versions I used, could
301 * stand some significant cleaning.
306 for (i = 0; i < fsc.nargs; i++)
307 asprintf(&fsc.s_args[i], "0x%lx", fsc.args[i]);
310 * Here, we only look for arguments that have OUT masked in --
311 * otherwise, they were handled in the syscall_entry function.
313 for (i = 0; i < sc->nargs; i++) {
315 if (sc->args[i].type & OUT) {
317 * If an error occurred, than don't bothe getting the data;
318 * it may not be valid.
321 asprintf(&temp, "0x%lx", fsc.args[sc->args[i].offset]);
323 temp = print_arg(&sc->args[i], fsc.args, retval, trussinfo);
324 fsc.s_args[i] = temp;
329 if (fsc.name != NULL &&
330 (!strcmp(fsc.name, "execve") || !strcmp(fsc.name, "exit"))) {
331 trussinfo->curthread->in_syscall = 1;
334 * It would probably be a good idea to merge the error handling,
335 * but that complicates things considerably.
338 print_syscall_ret(trussinfo, fsc.name, fsc.nargs, fsc.s_args, errorp,