2 * Copryight 1997 Sean Eric Fagan
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
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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/i386-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.
45 #include <sys/types.h>
46 #include <sys/syscall.h>
47 #include <sys/ptrace.h>
49 #include <machine/reg.h>
50 #include <machine/psl.h>
67 #include "freebsd32_syscalls.h"
69 static int nsyscalls = sizeof(freebsd32_syscallnames) /
70 sizeof(freebsd32_syscallnames[0]);
73 * This is what this particular file uses to keep track of a system call.
74 * It is probably not quite sufficient -- I can probably use the same
75 * structure for the various syscall personalities, and I also probably
76 * need to nest system calls (for signal handlers).
78 * 'struct syscall' describes the system call; it may be NULL, however,
79 * if we don't know about this particular system call yet.
81 static struct freebsd32_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. */
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 i386/i386/trap.c
114 * is ever changed these functions need to keep up.
118 amd64_fbsd32_syscall_entry(struct trussinfo *trussinfo, int nargs) {
122 unsigned long parm_offset;
123 struct syscall *sc = NULL;
124 struct ptrace_io_desc iorequest;
125 cpid = trussinfo->curthread->tid;
129 if (ptrace(PT_GETREGS, cpid, (caddr_t)®s, 0) < 0)
131 fprintf(trussinfo->outfile, "-- CANNOT READ REGISTERS --\n");
134 parm_offset = regs.r_rsp + sizeof(int);
137 * FreeBSD has two special kinds of system call redirctions --
138 * SYS_syscall, and SYS___syscall. The former is the old syscall()
139 * routine, basicly; the latter is for quad-aligned arguments.
141 syscall_num = regs.r_rax;
142 switch (syscall_num) {
144 syscall_num = ptrace(PT_READ_D, cpid, (caddr_t)parm_offset, 0);
145 parm_offset += sizeof(int);
148 syscall_num = ptrace(PT_READ_D, cpid, (caddr_t)parm_offset, 0);
149 parm_offset += sizeof(quad_t);
153 fsc.number = syscall_num;
155 (syscall_num < 0 || syscall_num >= nsyscalls) ? NULL :
156 freebsd32_syscallnames[syscall_num];
158 fprintf(trussinfo->outfile, "-- UNKNOWN SYSCALL %d --\n", syscall_num);
161 if (fsc.name && (trussinfo->flags & FOLLOWFORKS)
162 && ((!strcmp(fsc.name, "fork")
163 || !strcmp(fsc.name, "rfork")
164 || !strcmp(fsc.name, "vfork"))))
166 trussinfo->curthread->in_fork = 1;
172 fsc.args32 = malloc((1+nargs) * sizeof(unsigned int));
173 iorequest.piod_op = PIOD_READ_D;
174 iorequest.piod_offs = (void *)parm_offset;
175 iorequest.piod_addr = fsc.args32;
176 iorequest.piod_len = (1+nargs) * sizeof(unsigned int);
177 ptrace(PT_IO, cpid, (caddr_t)&iorequest, 0);
178 if (iorequest.piod_len == 0)
181 fsc.args = malloc((1+nargs) * sizeof(unsigned long));
182 for (i = 0; i < nargs + 1; i++)
183 fsc.args[i] = fsc.args32[i];
186 sc = get_syscall(fsc.name);
188 fsc.nargs = sc->nargs;
191 fprintf(trussinfo->outfile, "unknown syscall %s -- setting args to %d\n",
197 fsc.s_args = calloc(1, (1+fsc.nargs) * sizeof(char*));
201 * At this point, we set up the system call arguments.
202 * We ignore any OUT ones, however -- those are arguments that
203 * are set by the system call, and so are probably meaningless
204 * now. This doesn't currently support arguments that are
205 * passed in *and* out, however.
211 fprintf(stderr, "syscall %s(", fsc.name);
213 for (i = 0; i < fsc.nargs; i++) {
215 fprintf(stderr, "0x%x%s",
217 ? fsc.args[sc->args[i].offset]
219 i < (fsc.nargs - 1) ? "," : "");
221 if (sc && !(sc->args[i].type & OUT)) {
222 fsc.s_args[i] = print_arg(&sc->args[i], fsc.args, 0, trussinfo);
226 fprintf(stderr, ")\n");
231 fprintf(trussinfo->outfile, "\n");
234 if (fsc.name != NULL &&
235 (!strcmp(fsc.name, "freebsd32_execve") || !strcmp(fsc.name, "exit"))) {
238 * This could be done in a more general
239 * manner but it still wouldn't be very pretty.
241 if (!strcmp(fsc.name, "freebsd32_execve")) {
242 if ((trussinfo->flags & EXECVEARGS) == 0)
245 fsc.s_args[1] = NULL;
247 if ((trussinfo->flags & EXECVEENVS) == 0)
250 fsc.s_args[2] = NULL;
260 * And when the system call is done, we handle it here.
261 * Currently, no attempt is made to ensure that the system calls
262 * match -- this needs to be fixed (and is, in fact, why S_SCX includes
263 * the sytem call number instead of, say, an error status).
267 amd64_fbsd32_syscall_exit(struct trussinfo *trussinfo, int syscall_num __unused)
275 if (fsc.name == NULL)
277 cpid = trussinfo->curthread->tid;
279 if (ptrace(PT_GETREGS, cpid, (caddr_t)®s, 0) < 0)
281 fprintf(trussinfo->outfile, "-- CANNOT READ REGISTERS --\n");
286 errorp = !!(regs.r_rflags & PSL_C);
289 * This code, while simpler than the initial versions I used, could
290 * stand some significant cleaning.
295 for (i = 0; i < fsc.nargs; i++)
296 asprintf(&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, then don't bother getting the data;
307 * it may not be valid.
310 asprintf(&temp, "0x%lx", fsc.args[sc->args[i].offset]);
312 temp = print_arg(&sc->args[i], fsc.args, retval, trussinfo);
313 fsc.s_args[i] = temp;
318 if (fsc.name != NULL &&
319 (!strcmp(fsc.name, "freebsd32_execve") || !strcmp(fsc.name, "exit"))) {
320 trussinfo->curthread->in_syscall = 1;
324 * It would probably be a good idea to merge the error handling,
325 * but that complicates things considerably.
328 print_syscall_ret(trussinfo, fsc.name, fsc.nargs, fsc.s_args, errorp,