2 * Copryight 1998 Sean Eric Fagan
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31 * $FreeBSD: src/usr.bin/truss/alpha-fbsd.c,v 1.3.2.2 2001/10/29 20:12:56 des Exp $
32 * $DragonFly: src/usr.bin/truss/Attic/alpha-fbsd.c,v 1.2 2003/06/17 04:29:33 dillon Exp $
36 * FreeBSD/alpha-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.
42 * This file is almost nothing more than a slightly-edited i386-fbsd.c.
45 #include <sys/types.h>
46 #include <sys/ioctl.h>
47 #include <sys/pioctl.h>
48 #include <sys/syscall.h>
50 #include <machine/reg.h>
51 #include <machine/psl.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 static struct freebsd_syscall {
87 int nargs; /* number of arguments -- *not* number of words! */
88 char **s_args; /* the printable arguments */
91 /* Clear up and free parts of the fsc structure. */
99 for (i = 0; i < fsc.nargs; i++)
104 memset(&fsc, 0, sizeof(fsc));
108 * Called when a process has entered a system call. nargs is the
109 * number of words, not number of arguments (a necessary distinction
110 * in some cases). Note that if the STOPEVENT() code in alpha/alpha/trap.c
111 * is ever changed these functions need to keep up.
115 alpha_syscall_entry(int pid, int nargs) {
117 struct reg regs = { { 0 } };
120 unsigned int parm_offset;
122 int indir = 0; /* indirect system call */
124 if (fd == -1 || pid != cpid) {
125 sprintf(buf, "/proc/%d/regs", pid);
126 fd = open(buf, O_RDWR);
128 fprintf(outfile, "-- CANNOT READ REGISTERS --\n");
136 i = read(fd, ®s, sizeof(regs));
137 parm_offset = regs.r_regs[R_SP] + sizeof(int);
140 * FreeBSD has two special kinds of system call redirctions --
141 * SYS_syscall, and SYS___syscall. The former is the old syscall()
142 * routine, basicly; the latter is for quad-aligned arguments.
144 syscall = regs.r_regs[R_V0];
145 if (syscall == SYS_syscall || syscall == SYS___syscall) {
147 syscall = regs.r_regs[R_A0];
150 fsc.number = syscall;
152 (syscall < 0 || syscall > nsyscalls) ? NULL : syscallnames[syscall];
154 fprintf(outfile, "-- UNKNOWN SYSCALL %d --\n", syscall);
160 fsc.args = malloc((1+nargs) * sizeof(unsigned long));
164 * The OS doesn't seem to allow more than 10 words of
165 * parameters (yay!). So we shouldn't be here.
167 warn("More than 10 words (%d) of arguments!\n", nargs);
169 case 10: case 9: case 8: case 7:
171 * If there are 7-10 words of arguments, they are placed
172 * on the stack, as is normal for other processors.
173 * The fall-through for all of these is deliberate!!!
175 lseek(Procfd, regs.r_regs[R_SP], SEEK_SET);
176 read(fd, &fsc.args[6], (nargs - 6) * sizeof(fsc.args[0]));
177 case 6: fsc.args[5] = regs.r_regs[R_A5];
178 case 5: fsc.args[4] = regs.r_regs[R_A4];
179 case 4: fsc.args[3] = regs.r_regs[R_A3];
180 case 3: fsc.args[2] = regs.r_regs[R_A2];
181 case 2: fsc.args[1] = regs.r_regs[R_A1];
182 case 1: fsc.args[0] = regs.r_regs[R_A0];
188 memmove(&fsc.args[0], &fsc.args[1], (nargs-1) * sizeof(fsc.args[0]));
191 sc = get_syscall(fsc.name);
193 fsc.nargs = sc->nargs;
196 fprintf(outfile, "unknown syscall %s -- setting args to %d\n",
202 fsc.s_args = malloc((1+fsc.nargs) * sizeof(char*));
203 memset(fsc.s_args, 0, fsc.nargs * sizeof(char*));
207 * At this point, we set up the system call arguments.
208 * We ignore any OUT ones, however -- those are arguments that
209 * are set by the system call, and so are probably meaningless
210 * now. This doesn't currently support arguments that are
211 * passed in *and* out, however.
217 fprintf(stderr, "syscall %s(", fsc.name);
219 for (i = 0; i < fsc.nargs; i++) {
221 fprintf(stderr, "0x%x%s",
223 ? fsc.args[sc->args[i].offset]
225 i < (fsc.nargs -1) ? "," : "");
227 if (sc && !(sc->args[i].type & OUT)) {
228 fsc.s_args[i] = print_arg(Procfd, &sc->args[i], fsc.args);
232 fprintf(stderr, ")\n");
237 fprintf(outfile, "\n");
241 * Some system calls should be printed out before they are done --
242 * execve() and exit(), for example, never return. Possibly change
243 * this to work for any system call that doesn't have an OUT
247 if (!strcmp(fsc.name, "execve") || !strcmp(fsc.name, "exit")) {
248 print_syscall(outfile, fsc.name, fsc.nargs, fsc.s_args);
255 * And when the system call is done, we handle it here.
256 * Currently, no attempt is made to ensure that the system calls
257 * match -- this needs to be fixed (and is, in fact, why S_SCX includes
258 * the sytem call number instead of, say, an error status).
262 alpha_syscall_exit(int pid, int syscall) {
270 if (fd == -1 || pid != cpid) {
271 sprintf(buf, "/proc/%d/regs", pid);
272 fd = open(buf, O_RDONLY);
274 fprintf(outfile, "-- CANNOT READ REGISTERS --\n");
281 if (read(fd, ®s, sizeof(regs)) != sizeof(regs))
283 retval = regs.r_regs[R_V0];
284 errorp = !!(regs.r_regs[R_A3]);
287 * This code, while simpler than the initial versions I used, could
288 * stand some significant cleaning.
293 for (i = 0; i < fsc.nargs; i++) {
294 fsc.s_args[i] = malloc(12);
295 sprintf(fsc.s_args[i], "0x%lx", fsc.args[i]);
299 * Here, we only look for arguments that have OUT masked in --
300 * otherwise, they were handled in the syscall_entry function.
302 for (i = 0; i < sc->nargs; i++) {
304 if (sc->args[i].type & OUT) {
306 * If an error occurred, than don't bothe getting the data;
307 * it may not be valid.
311 sprintf(temp, "0x%lx", fsc.args[sc->args[i].offset]);
313 temp = print_arg(Procfd, &sc->args[i], fsc.args);
315 fsc.s_args[i] = temp;
321 * It would probably be a good idea to merge the error handling,
322 * but that complicates things considerably.
325 print_syscall_ret(outfile, fsc.name, fsc.nargs, fsc.s_args, errorp, retval);