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i386-fbsd.c (225736) i386-fbsd.c (241162)
1/*
2 * Copyright 1997 Sean Eric Fagan
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.

--- 17 unchanged lines hidden (view full) ---

26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32#ifndef lint
33static const char rcsid[] =
1/*
2 * Copyright 1997 Sean Eric Fagan
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.

--- 17 unchanged lines hidden (view full) ---

26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32#ifndef lint
33static const char rcsid[] =
34 "$FreeBSD: stable/9/usr.bin/truss/i386-fbsd.c 222103 2011-05-19 20:35:40Z bcr $";
34 "$FreeBSD: stable/9/usr.bin/truss/i386-fbsd.c 241162 2012-10-03 14:28:55Z zont $";
35#endif /* not lint */
36
37/*
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.
43 */
44
45#include <sys/types.h>
35#endif /* not lint */
36
37/*
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.
43 */
44
45#include <sys/types.h>
46#include <sys/syscall.h>
47#include <sys/ptrace.h>
46#include <sys/ptrace.h>
47#include <sys/syscall.h>
48
49#include <machine/reg.h>
50#include <machine/psl.h>
51
52#include <errno.h>
53#include <fcntl.h>
54#include <signal.h>
55#include <stdio.h>
56#include <stdlib.h>
57#include <string.h>
58#include <time.h>
59#include <unistd.h>
60
61#include "truss.h"
62#include "syscall.h"
63#include "extern.h"
64
48
49#include <machine/reg.h>
50#include <machine/psl.h>
51
52#include <errno.h>
53#include <fcntl.h>
54#include <signal.h>
55#include <stdio.h>
56#include <stdlib.h>
57#include <string.h>
58#include <time.h>
59#include <unistd.h>
60
61#include "truss.h"
62#include "syscall.h"
63#include "extern.h"
64
65static int cpid = -1;
66
67#include "syscalls.h"
68
69static int nsyscalls = sizeof(syscallnames) / sizeof(syscallnames[0]);
70
71/*
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).
76 *
77 * 'struct syscall' describes the system call; it may be NULL, however,
78 * if we don't know about this particular system call yet.
79 */
65#include "syscalls.h"
66
67static int nsyscalls = sizeof(syscallnames) / sizeof(syscallnames[0]);
68
69/*
70 * This is what this particular file uses to keep track of a system call.
71 * It is probably not quite sufficient -- I can probably use the same
72 * structure for the various syscall personalities, and I also probably
73 * need to nest system calls (for signal handlers).
74 *
75 * 'struct syscall' describes the system call; it may be NULL, however,
76 * if we don't know about this particular system call yet.
77 */
80static struct freebsd_syscall {
78struct freebsd_syscall {
81 struct syscall *sc;
82 const char *name;
83 int number;
84 unsigned long *args;
85 int nargs; /* number of arguments -- *not* number of words! */
86 char **s_args; /* the printable arguments */
79 struct syscall *sc;
80 const char *name;
81 int number;
82 unsigned long *args;
83 int nargs; /* number of arguments -- *not* number of words! */
84 char **s_args; /* the printable arguments */
87} fsc;
85};
88
86
87static struct freebsd_syscall *
88alloc_fsc(void)
89{
90
91 return (malloc(sizeof(struct freebsd_syscall)));
92}
93
89/* Clear up and free parts of the fsc structure. */
94/* Clear up and free parts of the fsc structure. */
90static __inline void
91clear_fsc(void) {
92 if (fsc.args) {
93 free(fsc.args);
94 }
95 if (fsc.s_args) {
96 int i;
97 for (i = 0; i < fsc.nargs; i++)
98 if (fsc.s_args[i])
99 free(fsc.s_args[i]);
100 free(fsc.s_args);
101 }
102 memset(&fsc, 0, sizeof(fsc));
95static void
96free_fsc(struct freebsd_syscall *fsc)
97{
98 int i;
99
100 free(fsc->args);
101 if (fsc->s_args) {
102 for (i = 0; i < fsc->nargs; i++)
103 free(fsc->s_args[i]);
104 free(fsc->s_args);
105 }
106 free(fsc);
103}
104
105/*
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.
110 */
111
112void
107}
108
109/*
110 * Called when a process has entered a system call. nargs is the
111 * number of words, not number of arguments (a necessary distinction
112 * in some cases). Note that if the STOPEVENT() code in i386/i386/trap.c
113 * is ever changed these functions need to keep up.
114 */
115
116void
113i386_syscall_entry(struct trussinfo *trussinfo, int nargs) {
114 struct reg regs;
115 int syscall_num;
116 int i;
117 unsigned int parm_offset;
118 struct syscall *sc = NULL;
119 struct ptrace_io_desc iorequest;
120 cpid = trussinfo->curthread->tid;
117i386_syscall_entry(struct trussinfo *trussinfo, int nargs)
118{
119 struct ptrace_io_desc iorequest;
120 struct reg regs;
121 struct freebsd_syscall *fsc;
122 struct syscall *sc;
123 lwpid_t tid;
124 unsigned int parm_offset;
125 int i, syscall_num;
121
126
122 clear_fsc();
123
124 if (ptrace(PT_GETREGS, cpid, (caddr_t)&regs, 0) < 0)
125 {
126 fprintf(trussinfo->outfile, "-- CANNOT READ REGISTERS --\n");
127 return;
128 }
129 parm_offset = regs.r_esp + sizeof(int);
127 tid = trussinfo->curthread->tid;
130
128
131 /*
132 * FreeBSD has two special kinds of system call redirctions --
133 * SYS_syscall, and SYS___syscall. The former is the old syscall()
134 * routine, basically; the latter is for quad-aligned arguments.
135 */
136 syscall_num = regs.r_eax;
137 switch (syscall_num) {
138 case SYS_syscall:
139 syscall_num = ptrace(PT_READ_D, cpid, (caddr_t)parm_offset, 0);
140 parm_offset += sizeof(int);
141 break;
142 case SYS___syscall:
143 syscall_num = ptrace(PT_READ_D, cpid, (caddr_t)parm_offset, 0);
144 parm_offset += sizeof(quad_t);
145 break;
146 }
129 if (ptrace(PT_GETREGS, tid, (caddr_t)&regs, 0) < 0) {
130 fprintf(trussinfo->outfile, "-- CANNOT READ REGISTERS --\n");
131 return;
132 }
133 parm_offset = regs.r_esp + sizeof(int);
147
134
148 fsc.number = syscall_num;
149 fsc.name =
150 (syscall_num < 0 || syscall_num >= nsyscalls) ? NULL : syscallnames[syscall_num];
151 if (!fsc.name) {
152 fprintf(trussinfo->outfile, "-- UNKNOWN SYSCALL %d --\n", syscall_num);
153 }
135 /*
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.
139 */
140 syscall_num = regs.r_eax;
141 switch (syscall_num) {
142 case SYS_syscall:
143 syscall_num = ptrace(PT_READ_D, tid, (caddr_t)parm_offset, 0);
144 parm_offset += sizeof(int);
145 break;
146 case SYS___syscall:
147 syscall_num = ptrace(PT_READ_D, tid, (caddr_t)parm_offset, 0);
148 parm_offset += sizeof(quad_t);
149 break;
150 }
154
151
155 if (fsc.name && (trussinfo->flags & FOLLOWFORKS)
156 && ((!strcmp(fsc.name, "fork")
157 || !strcmp(fsc.name, "rfork")
158 || !strcmp(fsc.name, "vfork"))))
159 {
160 trussinfo->curthread->in_fork = 1;
161 }
152 fsc = alloc_fsc();
153 if (fsc == NULL)
154 return;
155 fsc->number = syscall_num;
156 fsc->name = (syscall_num < 0 || syscall_num >= nsyscalls) ?
157 NULL : syscallnames[syscall_num];
158 if (!fsc->name) {
159 fprintf(trussinfo->outfile, "-- UNKNOWN SYSCALL %d --\n",
160 syscall_num);
161 }
162
162
163 if (nargs == 0)
164 return;
163 if (fsc->name && (trussinfo->flags & FOLLOWFORKS) &&
164 (strcmp(fsc->name, "fork") == 0 ||
165 strcmp(fsc->name, "rfork") == 0 ||
166 strcmp(fsc->name, "vfork") == 0))
167 trussinfo->curthread->in_fork = 1;
165
168
166 fsc.args = malloc((1+nargs) * sizeof(unsigned long));
167 iorequest.piod_op = PIOD_READ_D;
168 iorequest.piod_offs = (void *)parm_offset;
169 iorequest.piod_addr = fsc.args;
170 iorequest.piod_len = (1+nargs) * sizeof(unsigned long);
171 ptrace(PT_IO, cpid, (caddr_t)&iorequest, 0);
172 if (iorequest.piod_len == 0)
173 return;
169 if (nargs == 0)
170 return;
174
171
175 if (fsc.name)
176 sc = get_syscall(fsc.name);
177 if (sc) {
178 fsc.nargs = sc->nargs;
179 } else {
172 fsc->args = malloc((1 + nargs) * sizeof(unsigned long));
173 iorequest.piod_op = PIOD_READ_D;
174 iorequest.piod_offs = (void *)parm_offset;
175 iorequest.piod_addr = fsc->args;
176 iorequest.piod_len = (1 + nargs) * sizeof(unsigned long);
177 ptrace(PT_IO, tid, (caddr_t)&iorequest, 0);
178 if (iorequest.piod_len == 0)
179 return;
180
181 sc = NULL;
182 if (fsc->name)
183 sc = get_syscall(fsc->name);
184 if (sc)
185 fsc->nargs = sc->nargs;
186 else {
180#if DEBUG
187#if DEBUG
181 fprintf(trussinfo->outfile, "unknown syscall %s -- setting args to %d\n",
182 fsc.name, nargs);
188 fprintf(trussinfo->outfile, "unknown syscall %s -- setting "
189 "args to %d\n", fsc->name, nargs);
183#endif
190#endif
184 fsc.nargs = nargs;
185 }
191 fsc->nargs = nargs;
192 }
186
193
187 fsc.s_args = calloc(1, (1+fsc.nargs) * sizeof(char*));
188 fsc.sc = sc;
194 fsc->s_args = calloc(1, (1 + fsc->nargs) * sizeof(char *));
195 fsc->sc = sc;
189
196
190 /*
191 * At this point, we set up the system call arguments.
192 * We ignore any OUT ones, however -- those are arguments that
193 * are set by the system call, and so are probably meaningless
194 * now. This doesn't currently support arguments that are
195 * passed in *and* out, however.
196 */
197 /*
198 * At this point, we set up the system call arguments.
199 * We ignore any OUT ones, however -- those are arguments that
200 * are set by the system call, and so are probably meaningless
201 * now. This doesn't currently support arguments that are
202 * passed in *and* out, however.
203 */
197
204
198 if (fsc.name) {
199
205 if (fsc->name) {
200#if DEBUG
206#if DEBUG
201 fprintf(stderr, "syscall %s(", fsc.name);
207 fprintf(stderr, "syscall %s(", fsc->name);
202#endif
208#endif
203 for (i = 0; i < fsc.nargs; i++) {
209 for (i = 0; i < fsc->nargs; i++) {
204#if DEBUG
210#if DEBUG
205 fprintf(stderr, "0x%x%s",
206 sc
207 ? fsc.args[sc->args[i].offset]
208 : fsc.args[i],
209 i < (fsc.nargs - 1) ? "," : "");
211 fprintf(stderr, "0x%x%s", sc ?
212 fsc->args[sc->args[i].offset] : fsc->args[i],
213 i < (fsc->nargs - 1) ? "," : "");
210#endif
214#endif
211 if (sc && !(sc->args[i].type & OUT)) {
212 fsc.s_args[i] = print_arg(&sc->args[i], fsc.args, 0, trussinfo);
213 }
214 }
215 if (sc && !(sc->args[i].type & OUT)) {
216 fsc->s_args[i] = print_arg(&sc->args[i],
217 fsc->args, 0, trussinfo);
218 }
219 }
215#if DEBUG
220#if DEBUG
216 fprintf(stderr, ")\n");
221 fprintf(stderr, ")\n");
217#endif
222#endif
218 }
223 }
219
220#if DEBUG
224
225#if DEBUG
221 fprintf(trussinfo->outfile, "\n");
226 fprintf(trussinfo->outfile, "\n");
222#endif
223
227#endif
228
224 if (fsc.name != NULL &&
225 (!strcmp(fsc.name, "execve") || !strcmp(fsc.name, "exit"))) {
226
227 /* XXX
228 * This could be done in a more general
229 * manner but it still wouldn't be very pretty.
230 */
231 if (!strcmp(fsc.name, "execve")) {
232 if ((trussinfo->flags & EXECVEARGS) == 0)
233 if (fsc.s_args[1]) {
234 free(fsc.s_args[1]);
235 fsc.s_args[1] = NULL;
236 }
237 if ((trussinfo->flags & EXECVEENVS) == 0)
238 if (fsc.s_args[2]) {
239 free(fsc.s_args[2]);
240 fsc.s_args[2] = NULL;
241 }
242 }
243
244 }
245
246 return;
229 if (fsc->name != NULL && (strcmp(fsc->name, "execve") == 0 ||
230 strcmp(fsc->name, "exit") == 0)) {
231 /*
232 * XXX
233 * This could be done in a more general
234 * manner but it still wouldn't be very pretty.
235 */
236 if (strcmp(fsc->name, "execve") == 0) {
237 if ((trussinfo->flags & EXECVEARGS) == 0) {
238 if (fsc->s_args[1]) {
239 free(fsc->s_args[1]);
240 fsc->s_args[1] = NULL;
241 }
242 }
243 if ((trussinfo->flags & EXECVEENVS) == 0) {
244 if (fsc->s_args[2]) {
245 free(fsc->s_args[2]);
246 fsc->s_args[2] = NULL;
247 }
248 }
249 }
250 }
251 trussinfo->curthread->fsc = fsc;
247}
248
249/*
250 * And when the system call is done, we handle it here.
251 * Currently, no attempt is made to ensure that the system calls
252 * match -- this needs to be fixed (and is, in fact, why S_SCX includes
253 * the system call number instead of, say, an error status).
254 */
255
256long
257i386_syscall_exit(struct trussinfo *trussinfo, int syscall_num __unused)
258{
252}
253
254/*
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 system call number instead of, say, an error status).
259 */
260
261long
262i386_syscall_exit(struct trussinfo *trussinfo, int syscall_num __unused)
263{
259 struct reg regs;
260 long retval;
261 int i;
262 int errorp;
263 struct syscall *sc;
264 struct reg regs;
265 struct freebsd_syscall *fsc;
266 struct syscall *sc;
267 lwpid_t tid;
268 long retval;
269 int errorp, i;
264
270
265 if (fsc.name == NULL)
266 return (-1);
267 cpid = trussinfo->curthread->tid;
271 if (trussinfo->curthread->fsc == NULL)
272 return (-1);
268
273
269 if (ptrace(PT_GETREGS, cpid, (caddr_t)&regs, 0) < 0)
270 {
271 fprintf(trussinfo->outfile, "-- CANNOT READ REGISTERS --\n");
272 return (-1);
273 }
274
275 retval = regs.r_eax;
276 errorp = !!(regs.r_eflags & PSL_C);
274 tid = trussinfo->curthread->tid;
277
275
278 /*
279 * This code, while simpler than the initial versions I used, could
280 * stand some significant cleaning.
281 */
276 if (ptrace(PT_GETREGS, tid, (caddr_t)&regs, 0) < 0) {
277 fprintf(trussinfo->outfile, "-- CANNOT READ REGISTERS --\n");
278 return (-1);
279 }
282
280
283 sc = fsc.sc;
284 if (!sc) {
285 for (i = 0; i < fsc.nargs; i++)
286 asprintf(&fsc.s_args[i], "0x%lx", fsc.args[i]);
287 } else {
288 /*
289 * Here, we only look for arguments that have OUT masked in --
290 * otherwise, they were handled in the syscall_entry function.
291 */
292 for (i = 0; i < sc->nargs; i++) {
293 char *temp;
294 if (sc->args[i].type & OUT) {
281 retval = regs.r_eax;
282 errorp = !!(regs.r_eflags & PSL_C);
283
295 /*
284 /*
296 * If an error occurred, then don't bother getting the data;
297 * it may not be valid.
285 * This code, while simpler than the initial versions I used, could
286 * stand some significant cleaning.
298 */
287 */
299 if (errorp)
300 asprintf(&temp, "0x%lx", fsc.args[sc->args[i].offset]);
301 else
302 temp = print_arg(&sc->args[i], fsc.args, retval, trussinfo);
303 fsc.s_args[i] = temp;
304 }
305 }
306 }
307
288
308 if (fsc.name != NULL &&
309 (!strcmp(fsc.name, "execve") || !strcmp(fsc.name, "exit"))) {
310 trussinfo->curthread->in_syscall = 1;
311 }
289 fsc = trussinfo->curthread->fsc;
290 sc = fsc->sc;
291 if (!sc) {
292 for (i = 0; i < fsc->nargs; i++)
293 asprintf(&fsc->s_args[i], "0x%lx", fsc->args[i]);
294 } else {
295 /*
296 * Here, we only look for arguments that have OUT masked in --
297 * otherwise, they were handled in the syscall_entry function.
298 */
299 for (i = 0; i < sc->nargs; i++) {
300 char *temp;
301 if (sc->args[i].type & OUT) {
302 /*
303 * If an error occurred, then don't bother
304 * getting the data; it may not be valid.
305 */
306 if (errorp) {
307 asprintf(&temp, "0x%lx",
308 fsc->args[sc->args[i].offset]);
309 } else {
310 temp = print_arg(&sc->args[i],
311 fsc->args, retval, trussinfo);
312 }
313 fsc->s_args[i] = temp;
314 }
315 }
316 }
312
317
313 /*
314 * It would probably be a good idea to merge the error handling,
315 * but that complicates things considerably.
316 */
318 if (fsc->name != NULL && (strcmp(fsc->name, "execve") == 0 ||
319 strcmp(fsc->name, "exit") == 0))
320 trussinfo->curthread->in_syscall = 1;
317
321
318 print_syscall_ret(trussinfo, fsc.name, fsc.nargs, fsc.s_args, errorp,
319 retval, fsc.sc);
320 clear_fsc();
322 /*
323 * It would probably be a good idea to merge the error handling,
324 * but that complicates things considerably.
325 */
321
326
322 return (retval);
327 print_syscall_ret(trussinfo, fsc->name, fsc->nargs, fsc->s_args, errorp,
328 retval, fsc->sc);
329 free_fsc(fsc);
330
331 return (retval);
323}
332}