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powerpc-fbsd.c (225736) powerpc-fbsd.c (241162)
1/*
2 * Copyright 2006 Peter Grehan <grehan@freebsd.org>
3 * Copyright 2005 Orlando Bassotto <orlando@break.net>
4 * Copyright 1998 Sean Eric Fagan
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:

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

22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25 * SUCH DAMAGE.
26 */
27
28#ifndef lint
29static const char rcsid[] =
1/*
2 * Copyright 2006 Peter Grehan <grehan@freebsd.org>
3 * Copyright 2005 Orlando Bassotto <orlando@break.net>
4 * Copyright 1998 Sean Eric Fagan
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:

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

22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25 * SUCH DAMAGE.
26 */
27
28#ifndef lint
29static const char rcsid[] =
30 "$FreeBSD: stable/9/usr.bin/truss/powerpc-fbsd.c 222103 2011-05-19 20:35:40Z bcr $";
30 "$FreeBSD: stable/9/usr.bin/truss/powerpc-fbsd.c 241162 2012-10-03 14:28:55Z zont $";
31#endif /* not lint */
32
33/*
34 * FreeBSD/powerpc-specific system call handling. This is probably the most
35 * complex part of the entire truss program, although I've got lots of
36 * it handled relatively cleanly now. The system call names are generated
37 * automatically, thanks to /usr/src/sys/kern/syscalls.master. The
38 * names used for the various structures are confusing, I sadly admit.

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

56#include <string.h>
57#include <time.h>
58#include <unistd.h>
59
60#include "truss.h"
61#include "syscall.h"
62#include "extern.h"
63
31#endif /* not lint */
32
33/*
34 * FreeBSD/powerpc-specific system call handling. This is probably the most
35 * complex part of the entire truss program, although I've got lots of
36 * it handled relatively cleanly now. The system call names are generated
37 * automatically, thanks to /usr/src/sys/kern/syscalls.master. The
38 * names used for the various structures are confusing, I sadly admit.

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

56#include <string.h>
57#include <time.h>
58#include <unistd.h>
59
60#include "truss.h"
61#include "syscall.h"
62#include "extern.h"
63
64static int cpid = -1;
65
66#ifdef __powerpc64__ /* 32-bit compatibility */
67#include "freebsd32_syscalls.h"
64#ifdef __powerpc64__ /* 32-bit compatibility */
65#include "freebsd32_syscalls.h"
68#define syscallnames freebsd32_syscallnames
66#define syscallnames freebsd32_syscallnames
69#else /* native 32-bit */
70#include "syscalls.h"
71#endif
72
73static int nsyscalls = sizeof(syscallnames) / sizeof(syscallnames[0]);
74
75/*
76 * This is what this particular file uses to keep track of a system call.
77 * It is probably not quite sufficient -- I can probably use the same
78 * structure for the various syscall personalities, and I also probably
79 * need to nest system calls (for signal handlers).
80 *
81 * 'struct syscall' describes the system call; it may be NULL, however,
82 * if we don't know about this particular system call yet.
83 */
67#else /* native 32-bit */
68#include "syscalls.h"
69#endif
70
71static int nsyscalls = sizeof(syscallnames) / sizeof(syscallnames[0]);
72
73/*
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).
78 *
79 * 'struct syscall' describes the system call; it may be NULL, however,
80 * if we don't know about this particular system call yet.
81 */
84static struct freebsd_syscall {
82struct freebsd_syscall {
85 struct syscall *sc;
86 const char *name;
87 int number;
88 unsigned long *args;
89 int nargs; /* number of arguments -- *not* number of words! */
90 char **s_args; /* the printable arguments */
83 struct syscall *sc;
84 const char *name;
85 int number;
86 unsigned long *args;
87 int nargs; /* number of arguments -- *not* number of words! */
88 char **s_args; /* the printable arguments */
91} fsc;
89};
92
90
91static struct freebsd_syscall *
92alloc_fsc(void)
93{
94
95 return (malloc(sizeof(struct freebsd_syscall)));
96}
97
93/* Clear up and free parts of the fsc structure. */
98/* Clear up and free parts of the fsc structure. */
94static __inline void
95clear_fsc(void) {
96 if (fsc.args) {
97 free(fsc.args);
98 }
99 if (fsc.s_args) {
100 int i;
101 for (i = 0; i < fsc.nargs; i++)
102 if (fsc.s_args[i])
103 free(fsc.s_args[i]);
104 free(fsc.s_args);
105 }
106 memset(&fsc, 0, sizeof(fsc));
99static void
100free_fsc(struct freebsd_syscall *fsc)
101{
102 int i;
103
104 free(fsc->args);
105 if (fsc->s_args) {
106 for (i = 0; i < fsc->nargs; i++)
107 free(fsc->s_args[i]);
108 free(fsc->s_args);
109 }
110 free(fsc);
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 powerpc/powerpc/trap.c
113 * is ever changed these functions need to keep up.
114 */
115
116void
111}
112
113/*
114 * Called when a process has entered a system call. nargs is the
115 * number of words, not number of arguments (a necessary distinction
116 * in some cases). Note that if the STOPEVENT() code in powerpc/powerpc/trap.c
117 * is ever changed these functions need to keep up.
118 */
119
120void
117powerpc_syscall_entry(struct trussinfo *trussinfo, int nargs) {
118 char buf[32];
119 struct reg regs;
120 void *args;
121 int syscall_num;
122 int i;
123 unsigned int regargs;
124 struct syscall *sc;
121powerpc_syscall_entry(struct trussinfo *trussinfo, int nargs)
122{
123 struct ptrace_io_desc iorequest;
124 struct reg regs;
125 struct freebsd_syscall *fsc;
126 struct syscall *sc;
127 void *args;
128 lwpid_t tid;
129 int i, regargs, syscall_num;
125
130
126 /* Account for a 64-bit argument with corresponding alignment. */
127 nargs += 2;
131 /* Account for a 64-bit argument with corresponding alignment. */
132 nargs += 2;
128
133
129 cpid = trussinfo->curthread->tid;
134 tid = trussinfo->curthread->tid;
130
135
131 clear_fsc();
132 if (ptrace(PT_GETREGS, cpid, (caddr_t)&regs, 0) < 0) {
133 fprintf(trussinfo->outfile, "-- CANNOT READ REGISTERS --\n");
134 return;
135 }
136 if (ptrace(PT_GETREGS, tid, (caddr_t)&regs, 0) < 0) {
137 fprintf(trussinfo->outfile, "-- CANNOT READ REGISTERS --\n");
138 return;
139 }
136
140
137 /*
138 * FreeBSD has two special kinds of system call redirctions --
139 * SYS_syscall, and SYS___syscall. The former is the old syscall()
140 * routine, basically; the latter is for quad-aligned arguments.
141 */
142 regargs = NARGREG;
143 syscall_num = regs.fixreg[0];
144 args = &regs.fixreg[3];
145 if (syscall_num == SYS_syscall) {
146 args = &regs.fixreg[4];
147 regargs -= 1;
148 syscall_num = regs.fixreg[3];
149 } else if (syscall_num == SYS___syscall) {
150 args = &regs.fixreg[5];
151 regargs -= 2;
152 syscall_num = regs.fixreg[4];
153 }
141 /*
142 * FreeBSD has two special kinds of system call redirctions --
143 * SYS_syscall, and SYS___syscall. The former is the old syscall()
144 * routine, basically; the latter is for quad-aligned arguments.
145 */
146 regargs = NARGREG;
147 syscall_num = regs.fixreg[0];
148 args = &regs.fixreg[3];
149 if (syscall_num == SYS_syscall) {
150 args = &regs.fixreg[4];
151 regargs -= 1;
152 syscall_num = regs.fixreg[3];
153 } else if (syscall_num == SYS___syscall) {
154 args = &regs.fixreg[5];
155 regargs -= 2;
156 syscall_num = regs.fixreg[4];
157 }
154
158
155 fsc.number = syscall_num;
156 fsc.name =
157 (syscall_num < 0 || syscall_num >= nsyscalls) ? NULL : syscallnames[syscall_num];
158 if (!fsc.name) {
159 fprintf(trussinfo->outfile, "-- UNKNOWN SYSCALL %d --\n", syscall_num);
160 }
159 fsc = alloc_fsc();
160 if (fsc == NULL)
161 return;
162 fsc->number = syscall_num;
163 fsc->name = (syscall_num < 0 || syscall_num >= nsyscalls) ?
164 NULL : syscallnames[syscall_num];
165 if (!fsc->name) {
166 fprintf(trussinfo->outfile, "-- UNKNOWN SYSCALL %d --\n",
167 syscall_num);
168 }
161
169
162 if (fsc.name && (trussinfo->flags & FOLLOWFORKS)
163 && ((!strcmp(fsc.name, "fork")
164 || !strcmp(fsc.name, "rfork")
165 || !strcmp(fsc.name, "vfork"))))
166 {
167 trussinfo->curthread->in_fork = 1;
168 }
170 if (fsc->name && (trussinfo->flags & FOLLOWFORKS) &&
171 (strcmp(fsc->name, "fork") == 0 ||
172 strcmp(fsc->name, "rfork") == 0 ||
173 strcmp(fsc->name, "vfork") == 0))
174 trussinfo->curthread->in_fork = 1;
169
175
170 if (nargs == 0)
171 return;
176 if (nargs == 0)
177 return;
172
178
173 fsc.args = malloc((1+nargs) * sizeof(unsigned long));
179 fsc->args = malloc((1 + nargs) * sizeof(unsigned long));
174
180
175 if (nargs > regargs) {
176 struct ptrace_io_desc iorequest;
177 memmove(&fsc.args[0], args, regargs * sizeof(fsc.args[0]));
181 if (nargs > regargs) {
182 memmove(&fsc->args[0], args, regargs * sizeof(fsc->args[0]));
178
183
179 iorequest.piod_op = PIOD_READ_D;
180 iorequest.piod_offs = (void *)(regs.fixreg[1] + 8);
181 iorequest.piod_addr = &fsc.args[regargs];
182 iorequest.piod_len = (nargs - regargs) * sizeof(fsc.args[0]);
183 ptrace(PT_IO, cpid, (caddr_t)&iorequest, 0);
184 if (iorequest.piod_len == 0)
185 return;
186 } else {
187 memmove(&fsc.args[0], args, nargs * sizeof(fsc.args[0]));
188 }
184 iorequest.piod_op = PIOD_READ_D;
185 iorequest.piod_offs = (void *)(regs.fixreg[1] + 8);
186 iorequest.piod_addr = &fsc->args[regargs];
187 iorequest.piod_len = (nargs - regargs) * sizeof(fsc->args[0]);
188 ptrace(PT_IO, tid, (caddr_t)&iorequest, 0);
189 if (iorequest.piod_len == 0)
190 return;
191 } else
192 memmove(&fsc->args[0], args, nargs * sizeof(fsc->args[0]));
189
193
190 sc = get_syscall(fsc.name);
191 if (sc) {
192 fsc.nargs = sc->nargs;
193 } else {
194 sc = get_syscall(fsc->name);
195 if (sc)
196 fsc->nargs = sc->nargs;
197 else {
194#if DEBUG
198#if DEBUG
195 fprintf(trussinfo->outfile, "unknown syscall %s -- setting args to %d\n",
196 fsc.name, nargs);
199 fprintf(trussinfo->outfile, "unknown syscall %s -- setting "
200 "args to %d\n", fsc->name, nargs);
197#endif
201#endif
198 fsc.nargs = nargs;
199 }
202 fsc->nargs = nargs;
203 }
200
204
201 fsc.s_args = calloc(1, (1+fsc.nargs) * sizeof(char*));
202 fsc.sc = sc;
205 fsc->s_args = calloc(1, (1 + fsc->nargs) * sizeof(char *));
206 fsc->sc = sc;
203
207
204 /*
205 * At this point, we set up the system call arguments.
206 * We ignore any OUT ones, however -- those are arguments that
207 * are set by the system call, and so are probably meaningless
208 * now. This doesn't currently support arguments that are
209 * passed in *and* out, however.
210 */
208 /*
209 * At this point, we set up the system call arguments.
210 * We ignore any OUT ones, however -- those are arguments that
211 * are set by the system call, and so are probably meaningless
212 * now. This doesn't currently support arguments that are
213 * passed in *and* out, however.
214 */
211
215
212 if (fsc.name) {
213
216 if (fsc->name) {
214#if DEBUG
217#if DEBUG
215 fprintf(stderr, "syscall %s(", fsc.name);
218 fprintf(stderr, "syscall %s(", fsc->name);
216#endif
219#endif
217 for (i = 0; i < fsc.nargs; i++) {
220 for (i = 0; i < fsc->nargs; i++) {
218#if DEBUG
221#if DEBUG
219 fprintf(stderr, "0x%x%s",
220 sc
221 ? fsc.args[sc->args[i].offset]
222 : fsc.args[i],
223 i < (fsc.nargs - 1) ? "," : "");
222 fprintf(stderr, "0x%x%s", sc ?
223 fsc->args[sc->args[i].offset] : fsc->args[i],
224 i < (fsc->nargs - 1) ? "," : "");
224#endif
225#endif
225 if (sc && !(sc->args[i].type & OUT)) {
226 fsc.s_args[i] = print_arg(&sc->args[i], fsc.args, 0, trussinfo);
227 }
228 }
226 if (sc && !(sc->args[i].type & OUT)) {
227 fsc->s_args[i] = print_arg(&sc->args[i],
228 fsc->args, 0, trussinfo);
229 }
230 }
229#if DEBUG
231#if DEBUG
230 fprintf(stderr, ")\n");
232 fprintf(stderr, ")\n");
231#endif
233#endif
232 }
234 }
233
234#if DEBUG
235
236#if DEBUG
235 fprintf(trussinfo->outfile, "\n");
237 fprintf(trussinfo->outfile, "\n");
236#endif
237
238#endif
239
238 if (fsc.name && (!strcmp(fsc.name, "execve") || !strcmp(fsc.name, "exit"))) {
239
240 /* XXX
241 * This could be done in a more general
242 * manner but it still wouldn't be very pretty.
243 */
244 if (!strcmp(fsc.name, "execve")) {
245 if ((trussinfo->flags & EXECVEARGS) == 0)
246 if (fsc.s_args[1]) {
247 free(fsc.s_args[1]);
248 fsc.s_args[1] = NULL;
249 }
250 if ((trussinfo->flags & EXECVEENVS) == 0)
251 if (fsc.s_args[2]) {
252 free(fsc.s_args[2]);
253 fsc.s_args[2] = NULL;
254 }
255 }
256 }
257
258 return;
240 if (fsc->name != NULL && (strcmp(fsc->name, "execve") == 0 ||
241 strcmp(fsc->name, "exit") == 0)) {
242 /*
243 * XXX
244 * This could be done in a more general
245 * manner but it still wouldn't be very pretty.
246 */
247 if (strcmp(fsc->name, "execve") == 0) {
248 if ((trussinfo->flags & EXECVEARGS) == 0) {
249 if (fsc->s_args[1]) {
250 free(fsc->s_args[1]);
251 fsc->s_args[1] = NULL;
252 }
253 }
254 if ((trussinfo->flags & EXECVEENVS) == 0) {
255 if (fsc->s_args[2]) {
256 free(fsc->s_args[2]);
257 fsc->s_args[2] = NULL;
258 }
259 }
260 }
261 }
262 trussinfo->curthread->fsc = fsc;
259}
260
261/*
262 * And when the system call is done, we handle it here.
263 * Currently, no attempt is made to ensure that the system calls
264 * match -- this needs to be fixed (and is, in fact, why S_SCX includes
265 * the system call number instead of, say, an error status).
266 */
267
268long
269powerpc_syscall_exit(struct trussinfo *trussinfo, int syscall_num __unused)
270{
263}
264
265/*
266 * And when the system call is done, we handle it here.
267 * Currently, no attempt is made to ensure that the system calls
268 * match -- this needs to be fixed (and is, in fact, why S_SCX includes
269 * the system call number instead of, say, an error status).
270 */
271
272long
273powerpc_syscall_exit(struct trussinfo *trussinfo, int syscall_num __unused)
274{
271 struct reg regs;
272 long retval;
273 int i;
274 int errorp;
275 struct syscall *sc;
275 struct reg regs;
276 struct freebsd_syscall *fsc;
277 struct syscall *sc;
278 lwpid_t tid;
279 long retval;
280 int errorp, i;
276
281
277 if (fsc.name == NULL)
278 return (-1);
282 if (trussinfo->curthread->fsc == NULL)
283 return (-1);
279
284
280 cpid = trussinfo->curthread->tid;
285 tid = trussinfo->curthread->tid;
281
286
282 if (ptrace(PT_GETREGS, cpid, (caddr_t)&regs, 0) < 0) {
283 fprintf(trussinfo->outfile, "\n");
284 return (-1);
285 }
286 retval = regs.fixreg[3];
287 errorp = !!(regs.cr & 0x10000000);
287 if (ptrace(PT_GETREGS, tid, (caddr_t)&regs, 0) < 0) {
288 fprintf(trussinfo->outfile, "\n");
289 return (-1);
290 }
288
291
289 /*
290 * This code, while simpler than the initial versions I used, could
291 * stand some significant cleaning.
292 */
292 retval = regs.fixreg[3];
293 errorp = !!(regs.cr & 0x10000000);
293
294
294 sc = fsc.sc;
295 if (!sc) {
296 for (i = 0; i < fsc.nargs; i++)
297 asprintf(&fsc.s_args[i], "0x%lx", fsc.args[i]);
298 } else {
299 /*
300 * On 32-bit big-endian, the low word of a 64-bit return is
301 * in the greater address. Switch to this. XXX note that
302 * print_syscall_ret can't handle 64-bit return values (llseek)
303 */
304 if (sc->ret_type == 2)
305 retval = regs.fixreg[4];
306
307 /*
308 * Here, we only look for arguments that have OUT masked in --
309 * otherwise, they were handled in the syscall_entry function.
310 */
311 for (i = 0; i < sc->nargs; i++) {
312 char *temp;
313 if (sc->args[i].type & OUT) {
314 /*
295 /*
315 * If an error occurred, than don't bothe getting the data;
316 * it may not be valid.
296 * This code, while simpler than the initial versions I used, could
297 * stand some significant cleaning.
317 */
298 */
318 if (errorp)
319 asprintf(&temp, "0x%lx", fsc.args[sc->args[i].offset]);
320 else
321 temp = print_arg(&sc->args[i], fsc.args, retval, trussinfo);
322 fsc.s_args[i] = temp;
323 }
324 }
325 }
326
299
327 if (fsc.name != NULL &&
328 (!strcmp(fsc.name, "execve") || !strcmp(fsc.name, "exit"))) {
329 trussinfo->curthread->in_syscall = 1;
330 }
300 fsc = trussinfo->curthread->fsc;
301 sc = fsc->sc;
302 if (!sc) {
303 for (i = 0; i < fsc->nargs; i++)
304 asprintf(&fsc->s_args[i], "0x%lx", fsc->args[i]);
305 } else {
306 /*
307 * On 32-bit big-endian, the low word of a 64-bit return is
308 * in the greater address. Switch to this. XXX note that
309 * print_syscall_ret can't handle 64-bit return values (llseek)
310 */
311 if (sc->ret_type == 2)
312 retval = regs.fixreg[4];
331
313
314 /*
315 * Here, we only look for arguments that have OUT masked in --
316 * otherwise, they were handled in the syscall_entry function.
317 */
318 for (i = 0; i < sc->nargs; i++) {
319 char *temp;
320 if (sc->args[i].type & OUT) {
321 /*
322 * If an error occurred, then don't bother
323 * getting the data; it may not be valid.
324 */
325 if (errorp) {
326 asprintf(&temp, "0x%lx",
327 fsc->args[sc->args[i].offset]);
328 } else {
329 temp = print_arg(&sc->args[i],
330 fsc->args, retval, trussinfo);
331 }
332 fsc->s_args[i] = temp;
333 }
334 }
335 }
332
336
333 /*
334 * It would probably be a good idea to merge the error handling,
335 * but that complicates things considerably.
336 */
337 if (fsc->name != NULL && (strcmp(fsc->name, "execve") == 0 ||
338 strcmp(fsc->name, "exit") == 0))
339 trussinfo->curthread->in_syscall = 1;
337
340
338 print_syscall_ret(trussinfo, fsc.name, fsc.nargs, fsc.s_args, errorp,
339 retval, fsc.sc);
340 clear_fsc();
341 /*
342 * It would probably be a good idea to merge the error handling,
343 * but that complicates things considerably.
344 */
341
345
342 return (retval);
346 print_syscall_ret(trussinfo, fsc->name, fsc->nargs, fsc->s_args, errorp,
347 retval, fsc->sc);
348 free_fsc(fsc);
349
350 return (retval);
343}
351}