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amd64-fbsd32.c (171646) amd64-fbsd32.c (179051)
1/*
2 * Copryight 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 * Copryight 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: head/usr.bin/truss/amd64-fbsd32.c 171646 2007-07-28 23:15:04Z marcel $";
34 "$FreeBSD: head/usr.bin/truss/amd64-fbsd32.c 179051 2008-05-16 15:34:06Z jhb $";
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.

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59#include <unistd.h>
60
61#include "truss.h"
62#include "syscall.h"
63#include "extern.h"
64
65static int cpid = -1;
66
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.

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

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"
67#include "freebsd32_syscalls.h"
68
68
69static int nsyscalls = sizeof(syscallnames) / sizeof(syscallnames[0]);
69static int nsyscalls = sizeof(freebsd32_syscallnames) /
70 sizeof(freebsd32_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 */
71
72/*
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).
77 *
78 * 'struct syscall' describes the system call; it may be NULL, however,
79 * if we don't know about this particular system call yet.
80 */
80static struct freebsd_syscall {
81static struct freebsd32_syscall {
81 struct syscall *sc;
82 const char *name;
83 int number;
84 unsigned long *args;
82 struct syscall *sc;
83 const char *name;
84 int number;
85 unsigned long *args;
86 unsigned int *args32;
85 int nargs; /* number of arguments -- *not* number of words! */
86 char **s_args; /* the printable arguments */
87} fsc;
88
89/* Clear up and free parts of the fsc structure. */
90static __inline void
91clear_fsc(void) {
92 if (fsc.args) {
93 free(fsc.args);
94 }
87 int nargs; /* number of arguments -- *not* number of words! */
88 char **s_args; /* the printable arguments */
89} fsc;
90
91/* Clear up and free parts of the fsc structure. */
92static __inline void
93clear_fsc(void) {
94 if (fsc.args) {
95 free(fsc.args);
96 }
97 if (fsc.args32) {
98 free(fsc.args32);
99 }
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));
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
100 if (fsc.s_args) {
101 int i;
102 for (i = 0; i < fsc.nargs; i++)
103 if (fsc.s_args[i])
104 free(fsc.s_args[i]);
105 free(fsc.s_args);
106 }
107 memset(&fsc, 0, sizeof(fsc));
108}
109
110/*
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.
115 */
116
117void
113i386_syscall_entry(struct trussinfo *trussinfo, int nargs) {
118amd64_fbsd32_syscall_entry(struct trussinfo *trussinfo, int nargs) {
114 struct reg regs;
115 int syscall_num;
116 int i;
119 struct reg regs;
120 int syscall_num;
121 int i;
117 unsigned int parm_offset;
122 unsigned long parm_offset;
118 struct syscall *sc = NULL;
119 struct ptrace_io_desc iorequest;
120 cpid = trussinfo->curthread->tid;
121
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 }
123 struct syscall *sc = NULL;
124 struct ptrace_io_desc iorequest;
125 cpid = trussinfo->curthread->tid;
126
127 clear_fsc();
128
129 if (ptrace(PT_GETREGS, cpid, (caddr_t)&regs, 0) < 0)
130 {
131 fprintf(trussinfo->outfile, "-- CANNOT READ REGISTERS --\n");
132 return;
133 }
129 parm_offset = regs.r_esp + sizeof(int);
134 parm_offset = regs.r_rsp + sizeof(int);
130
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, basicly; the latter is for quad-aligned arguments.
135 */
135
136 /*
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.
140 */
136 syscall_num = regs.r_eax;
141 syscall_num = regs.r_rax;
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 }
147
148 fsc.number = syscall_num;
149 fsc.name =
142 switch (syscall_num) {
143 case SYS_syscall:
144 syscall_num = ptrace(PT_READ_D, cpid, (caddr_t)parm_offset, 0);
145 parm_offset += sizeof(int);
146 break;
147 case SYS___syscall:
148 syscall_num = ptrace(PT_READ_D, cpid, (caddr_t)parm_offset, 0);
149 parm_offset += sizeof(quad_t);
150 break;
151 }
152
153 fsc.number = syscall_num;
154 fsc.name =
150 (syscall_num < 0 || syscall_num > nsyscalls) ? NULL : syscallnames[syscall_num];
155 (syscall_num < 0 || syscall_num > nsyscalls) ? NULL :
156 freebsd32_syscallnames[syscall_num];
151 if (!fsc.name) {
152 fprintf(trussinfo->outfile, "-- UNKNOWN SYSCALL %d --\n", syscall_num);
153 }
154
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 }
162
163 if (nargs == 0)
164 return;
165
157 if (!fsc.name) {
158 fprintf(trussinfo->outfile, "-- UNKNOWN SYSCALL %d --\n", syscall_num);
159 }
160
161 if (fsc.name && (trussinfo->flags & FOLLOWFORKS)
162 && ((!strcmp(fsc.name, "fork")
163 || !strcmp(fsc.name, "rfork")
164 || !strcmp(fsc.name, "vfork"))))
165 {
166 trussinfo->curthread->in_fork = 1;
167 }
168
169 if (nargs == 0)
170 return;
171
166 fsc.args = malloc((1+nargs) * sizeof(unsigned long));
172 fsc.args32 = malloc((1+nargs) * sizeof(unsigned int));
167 iorequest.piod_op = PIOD_READ_D;
168 iorequest.piod_offs = (void *)parm_offset;
173 iorequest.piod_op = PIOD_READ_D;
174 iorequest.piod_offs = (void *)parm_offset;
169 iorequest.piod_addr = fsc.args;
170 iorequest.piod_len = (1+nargs) * sizeof(unsigned long);
175 iorequest.piod_addr = fsc.args32;
176 iorequest.piod_len = (1+nargs) * sizeof(unsigned int);
171 ptrace(PT_IO, cpid, (caddr_t)&iorequest, 0);
172 if (iorequest.piod_len == 0)
173 return;
174
177 ptrace(PT_IO, cpid, (caddr_t)&iorequest, 0);
178 if (iorequest.piod_len == 0)
179 return;
180
181 fsc.args = malloc((1+nargs) * sizeof(unsigned long));
182 for (i = 0; i < nargs + 1; i++)
183 fsc.args[i] = fsc.args32[i];
184
175 if (fsc.name)
176 sc = get_syscall(fsc.name);
177 if (sc) {
178 fsc.nargs = sc->nargs;
179 } else {
180#if DEBUG
181 fprintf(trussinfo->outfile, "unknown syscall %s -- setting args to %d\n",
182 fsc.name, nargs);

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

218#endif
219 }
220
221#if DEBUG
222 fprintf(trussinfo->outfile, "\n");
223#endif
224
225 if (fsc.name != NULL &&
185 if (fsc.name)
186 sc = get_syscall(fsc.name);
187 if (sc) {
188 fsc.nargs = sc->nargs;
189 } else {
190#if DEBUG
191 fprintf(trussinfo->outfile, "unknown syscall %s -- setting args to %d\n",
192 fsc.name, nargs);

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228#endif
229 }
230
231#if DEBUG
232 fprintf(trussinfo->outfile, "\n");
233#endif
234
235 if (fsc.name != NULL &&
226 (!strcmp(fsc.name, "execve") || !strcmp(fsc.name, "exit"))) {
236 (!strcmp(fsc.name, "freebsd32_execve") || !strcmp(fsc.name, "exit"))) {
227
228 /* XXX
229 * This could be done in a more general
230 * manner but it still wouldn't be very pretty.
231 */
237
238 /* XXX
239 * This could be done in a more general
240 * manner but it still wouldn't be very pretty.
241 */
232 if (!strcmp(fsc.name, "execve")) {
242 if (!strcmp(fsc.name, "freebsd32_execve")) {
233 if ((trussinfo->flags & EXECVEARGS) == 0)
234 if (fsc.s_args[1]) {
235 free(fsc.s_args[1]);
236 fsc.s_args[1] = NULL;
237 }
238 if ((trussinfo->flags & EXECVEENVS) == 0)
239 if (fsc.s_args[2]) {
240 free(fsc.s_args[2]);

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250/*
251 * And when the system call is done, we handle it here.
252 * Currently, no attempt is made to ensure that the system calls
253 * match -- this needs to be fixed (and is, in fact, why S_SCX includes
254 * the sytem call number instead of, say, an error status).
255 */
256
257long
243 if ((trussinfo->flags & EXECVEARGS) == 0)
244 if (fsc.s_args[1]) {
245 free(fsc.s_args[1]);
246 fsc.s_args[1] = NULL;
247 }
248 if ((trussinfo->flags & EXECVEENVS) == 0)
249 if (fsc.s_args[2]) {
250 free(fsc.s_args[2]);

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260/*
261 * And when the system call is done, we handle it here.
262 * Currently, no attempt is made to ensure that the system calls
263 * match -- this needs to be fixed (and is, in fact, why S_SCX includes
264 * the sytem call number instead of, say, an error status).
265 */
266
267long
258i386_syscall_exit(struct trussinfo *trussinfo, int syscall_num __unused)
268amd64_fbsd32_syscall_exit(struct trussinfo *trussinfo, int syscall_num __unused)
259{
260 struct reg regs;
261 long retval;
262 int i;
263 int errorp;
264 struct syscall *sc;
265
266 if (fsc.name == NULL)
267 return (-1);
268 cpid = trussinfo->curthread->tid;
269
270 if (ptrace(PT_GETREGS, cpid, (caddr_t)&regs, 0) < 0)
271 {
272 fprintf(trussinfo->outfile, "-- CANNOT READ REGISTERS --\n");
273 return (-1);
274 }
275
269{
270 struct reg regs;
271 long retval;
272 int i;
273 int errorp;
274 struct syscall *sc;
275
276 if (fsc.name == NULL)
277 return (-1);
278 cpid = trussinfo->curthread->tid;
279
280 if (ptrace(PT_GETREGS, cpid, (caddr_t)&regs, 0) < 0)
281 {
282 fprintf(trussinfo->outfile, "-- CANNOT READ REGISTERS --\n");
283 return (-1);
284 }
285
276 retval = regs.r_eax;
277 errorp = !!(regs.r_eflags & PSL_C);
286 retval = regs.r_rax;
287 errorp = !!(regs.r_rflags & PSL_C);
278
279 /*
280 * This code, while simpler than the initial versions I used, could
281 * stand some significant cleaning.
282 */
283
284 sc = fsc.sc;
285 if (!sc) {

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310 * The pipe syscall returns its fds in two registers and has assembly glue
311 * to provide the libc API, so it cannot be handled like regular syscalls.
312 * The nargs check is so we don't have to do yet another strcmp on every
313 * syscall.
314 */
315 if (!errorp && fsc.nargs == 0 && fsc.name && strcmp(fsc.name, "pipe") == 0) {
316 fsc.nargs = 1;
317 fsc.s_args = malloc((1+fsc.nargs) * sizeof(char*));
288
289 /*
290 * This code, while simpler than the initial versions I used, could
291 * stand some significant cleaning.
292 */
293
294 sc = fsc.sc;
295 if (!sc) {

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320 * The pipe syscall returns its fds in two registers and has assembly glue
321 * to provide the libc API, so it cannot be handled like regular syscalls.
322 * The nargs check is so we don't have to do yet another strcmp on every
323 * syscall.
324 */
325 if (!errorp && fsc.nargs == 0 && fsc.name && strcmp(fsc.name, "pipe") == 0) {
326 fsc.nargs = 1;
327 fsc.s_args = malloc((1+fsc.nargs) * sizeof(char*));
318 asprintf(&fsc.s_args[0], "[%d,%d]", (int)retval, regs.r_edx);
328 asprintf(&fsc.s_args[0], "[%d,%d]", (int)retval, (int)regs.r_rdx);
319 retval = 0;
320 }
321
322 if (fsc.name != NULL &&
329 retval = 0;
330 }
331
332 if (fsc.name != NULL &&
323 (!strcmp(fsc.name, "execve") || !strcmp(fsc.name, "exit"))) {
333 (!strcmp(fsc.name, "freebsd32_execve") || !strcmp(fsc.name, "exit"))) {
324 trussinfo->curthread->in_syscall = 1;
325 }
326
327 /*
328 * It would probably be a good idea to merge the error handling,
329 * but that complicates things considerably.
330 */
331
332 print_syscall_ret(trussinfo, fsc.name, fsc.nargs, fsc.s_args, errorp, retval);
333 clear_fsc();
334
335 return (retval);
336}
334 trussinfo->curthread->in_syscall = 1;
335 }
336
337 /*
338 * It would probably be a good idea to merge the error handling,
339 * but that complicates things considerably.
340 */
341
342 print_syscall_ret(trussinfo, fsc.name, fsc.nargs, fsc.s_args, errorp, retval);
343 clear_fsc();
344
345 return (retval);
346}