2 * Copryight 1997 Sean Eric Fagan
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14 * This product includes software developed by Sean Eric Fagan
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31 * $FreeBSD: src/usr.bin/truss/i386-fbsd.c,v 1.7.2.2 2001/10/29 20:12:56 des Exp $
32 * $DragonFly: src/usr.bin/truss/i386-fbsd.c,v 1.5 2008/10/16 01:52:33 swildner Exp $
36 * FreeBSD/x86_64-specific system call handling. This is probably the most
37 * complex part of the entire truss program, although I've got lots of
38 * it handled relatively cleanly now. The system call names are generated
39 * automatically, thanks to /usr/src/sys/kern/syscalls.master. The
40 * names used for the various structures are confusing, I sadly admit.
43 #include <sys/types.h>
44 #include <sys/ioctl.h>
45 #include <sys/pioctl.h>
46 #include <sys/syscall.h>
48 #include <machine/reg.h>
49 #include <machine/psl.h>
69 static int nsyscalls = sizeof(syscallnames) / sizeof(syscallnames[0]);
72 * This is what this particular file uses to keep track of a system call.
73 * It is probably not quite sufficient -- I can probably use the same
74 * structure for the various syscall personalities, and I also probably
75 * need to nest system calls (for signal handlers).
77 * 'struct syscall' describes the system call; it may be NULL, however,
78 * if we don't know about this particular system call yet.
80 static struct freebsd_syscall {
85 int nargs; /* number of arguments -- *not* number of words! */
86 char **s_args; /* the printable arguments */
89 /* Clear up and free parts of the fsc structure. */
97 for (i = 0; i < fsc.nargs; i++)
102 memset(&fsc, 0, sizeof(fsc));
106 * Called when a process has entered a system call. nargs is the
107 * number of words, not number of arguments (a necessary distinction
108 * in some cases). Note that if the STOPEVENT() code in i386/i386/trap.c
109 * is ever changed these functions need to keep up.
113 x86_64_syscall_entry(struct trussinfo *trussinfo, int nargs) {
115 struct reg regs = { .r_err = 0 };
120 if (fd == -1 || trussinfo->pid != cpid) {
121 asprintf(&buf, "%s/%d/regs", procfs_path, trussinfo->pid);
123 err(1, "Out of memory");
124 fd = open(buf, O_RDWR);
127 fprintf(trussinfo->outfile, "-- CANNOT READ REGISTERS --\n");
130 cpid = trussinfo->pid;
135 i = read(fd, ®s, sizeof(regs));
138 * FreeBSD has two special kinds of system call redirctions --
139 * SYS_syscall, and SYS___syscall. The former is the old syscall()
140 * routine, basicly; the latter is for quad-aligned arguments.
143 syscall_num = regs.r_rax;
144 switch (syscall_num) {
147 syscall_num = regs.r_rdi;
152 fsc.number = syscall_num;
154 (syscall_num < 0 || syscall_num >= nsyscalls) ? NULL : syscallnames[syscall_num];
156 fprintf(trussinfo->outfile, "-- UNKNOWN SYSCALL %d --\n", syscall_num);
162 fsc.args = malloc((1+nargs) * sizeof(unsigned long));
163 for (i = 0; i < nargs && reg < 6; i++, reg++) {
165 case 0: fsc.args[i] = regs.r_rdi; break;
166 case 1: fsc.args[i] = regs.r_rsi; break;
167 case 2: fsc.args[i] = regs.r_rdx; break;
168 case 3: fsc.args[i] = regs.r_rcx; break;
169 case 4: fsc.args[i] = regs.r_r8; break;
170 case 5: fsc.args[i] = regs.r_r9; break;
174 lseek(Procfd, regs.r_rsp + sizeof(register_t), SEEK_SET);
175 if (read(Procfd, &fsc.args[i], (nargs-i) * sizeof(register_t)) == -1)
179 sc = fsc.name ? get_syscall(fsc.name) : NULL;
181 fsc.nargs = sc->nargs;
184 fprintf(trussinfo->trussinfo->outfile, "unknown syscall %s -- setting args to %d\n",
190 fsc.s_args = malloc((1+fsc.nargs) * sizeof(char*));
191 memset(fsc.s_args, 0, fsc.nargs * sizeof(char*));
195 * At this point, we set up the system call arguments.
196 * We ignore any OUT ones, however -- those are arguments that
197 * are set by the system call, and so are probably meaningless
198 * now. This doesn't currently support arguments that are
199 * passed in *and* out, however.
205 fprintf(stderr, "syscall %s(", fsc.name);
207 for (i = 0; i < fsc.nargs; i++) {
209 fprintf(stderr, "0x%x%s",
211 ? fsc.args[sc->args[i].offset]
213 i < (fsc.nargs -1) ? "," : "");
215 if (sc && !(sc->args[i].type & OUT)) {
216 fsc.s_args[i] = print_arg(Procfd, &sc->args[i], fsc.args);
220 fprintf(stderr, ")\n");
225 fprintf(trussinfo->trussinfo->outfile, "\n");
229 * Some system calls should be printed out before they are done --
230 * execve() and exit(), for example, never return. Possibly change
231 * this to work for any system call that doesn't have an OUT
235 if (fsc.name != NULL &&
236 (!strcmp(fsc.name, "execve") || !strcmp(fsc.name, "exit"))) {
237 print_syscall(trussinfo, fsc.name, fsc.nargs, fsc.s_args);
244 * And when the system call is done, we handle it here.
245 * Currently, no attempt is made to ensure that the system calls
246 * match -- this needs to be fixed (and is, in fact, why S_SCX includes
247 * the sytem call number instead of, say, an error status).
251 x86_64_syscall_exit(struct trussinfo *trussinfo, int syscall_num __unused) {
259 if (fsc.name == NULL)
262 if (fd == -1 || trussinfo->pid != cpid) {
263 asprintf(&buf, "%s/%d/regs", procfs_path, trussinfo->pid);
265 err(1, "Out of memory");
266 fd = open(buf, O_RDONLY);
269 fprintf(trussinfo->outfile, "-- CANNOT READ REGISTERS --\n");
272 cpid = trussinfo->pid;
276 if (read(fd, ®s, sizeof(regs)) != sizeof(regs)) {
277 fprintf(trussinfo->outfile, "\n");
281 errorp = !!(regs.r_rflags & PSL_C);
284 * This code, while simpler than the initial versions I used, could
285 * stand some significant cleaning.
290 for (i = 0; i < fsc.nargs; i++) {
291 fsc.s_args[i] = malloc(12);
292 sprintf(fsc.s_args[i], "0x%lx", fsc.args[i]);
296 * Here, we only look for arguments that have OUT masked in --
297 * otherwise, they were handled in the syscall_entry function.
299 for (i = 0; i < sc->nargs; i++) {
301 if (sc->args[i].type & OUT) {
303 * If an error occurred, than don't bothe getting the data;
304 * it may not be valid.
308 sprintf(temp, "0x%lx", fsc.args[sc->args[i].offset]);
310 temp = print_arg(Procfd, &sc->args[i], fsc.args);
312 fsc.s_args[i] = temp;
318 * It would probably be a good idea to merge the error handling,
319 * but that complicates things considerably.
322 print_syscall_ret(trussinfo, fsc.name, fsc.nargs, fsc.s_args, errorp, retval);