ia64-fbsd.c revision 118367
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. 9 * 2. Redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution. 12 * 3. All advertising materials mentioning features or use of this software 13 * must display the following acknowledgement: 14 * This product includes software developed by Sean Eric Fagan 15 * 4. Neither the name of the author may be used to endorse or promote 16 * products derived from this software without specific prior written 17 * permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 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/ia64-fbsd.c 118367 2003-08-02 22:29:10Z marcel $"; 35#endif /* not lint */ 36 37/* 38 * FreeBSD/ia64-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/ioctl.h> 47#include <sys/pioctl.h> 48#include <sys/syscall.h> 49 50#include <machine/reg.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 fd = -1; 66static int cpid = -1; 67extern int Procfd; 68 69#include "syscalls.h" 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 */ 82static struct freebsd_syscall { 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 */ 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.s_args) { 98 int i; 99 for (i = 0; i < fsc.nargs; i++) 100 if (fsc.s_args[i]) 101 free(fsc.s_args[i]); 102 free(fsc.s_args); 103 } 104 memset(&fsc, 0, sizeof(fsc)); 105} 106 107/* 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 ia64/ia64/trap.c 111 * is ever changed these functions need to keep up. 112 */ 113 114void 115ia64_syscall_entry(struct trussinfo *trussinfo, int nargs) { 116 char buf[32]; 117 struct reg regs; 118 int syscall_num; 119 int i; 120 unsigned long *parm_offset; 121 struct syscall *sc; 122 123 if (fd == -1 || trussinfo->pid != cpid) { 124 sprintf(buf, "/proc/%d/regs", trussinfo->pid); 125 fd = open(buf, O_RDWR); 126 if (fd == -1) { 127 fprintf(trussinfo->outfile, "-- CANNOT OPEN REGISTERS --\n"); 128 return; 129 } 130 cpid = trussinfo->pid; 131 } 132 133 clear_fsc(); 134 lseek(fd, 0L, 0); 135 if (read(fd, ®s, sizeof(regs)) != sizeof(regs)) { 136 fprintf(trussinfo->outfile, "-- CANNOT READ REGISTERS --\n"); 137 return; 138 } 139 parm_offset = ®s.r_scratch.gr16; 140 141 /* 142 * FreeBSD has two special kinds of system call redirctions -- 143 * SYS_syscall, and SYS___syscall. The former is the old syscall() 144 * routine, basicly; the latter is for quad-aligned arguments. 145 */ 146 syscall_num = regs.r_scratch.gr15; /* XXX double-check. */ 147 if (syscall_num == SYS_syscall || syscall_num == SYS___syscall) 148 syscall_num = (int)*parm_offset++; 149 150 fsc.number = syscall_num; 151 fsc.name = (syscall_num < 0 || syscall_num > nsyscalls) 152 ? NULL : syscallnames[syscall_num]; 153 if (!fsc.name) { 154 fprintf(trussinfo->outfile, "-- UNKNOWN SYSCALL %d --\n", syscall_num); 155 } 156 157 if (fsc.name && (trussinfo->flags & FOLLOWFORKS) 158 && ((!strcmp(fsc.name, "fork") 159 || !strcmp(fsc.name, "rfork") 160 || !strcmp(fsc.name, "vfork")))) 161 { 162 trussinfo->in_fork = 1; 163 } 164 165 if (nargs == 0) 166 return; 167 168 fsc.args = malloc((1+nargs) * sizeof(unsigned long)); 169 memcpy(fsc.args, parm_offset, nargs * sizeof(long)); 170 171 sc = get_syscall(fsc.name); 172 if (sc) { 173 fsc.nargs = sc->nargs; 174 } else { 175#if DEBUG 176 fprintf(trussinfo->outfile, "unknown syscall %s -- setting args to %d\n", 177 fsc.name, nargs); 178#endif 179 fsc.nargs = nargs; 180 } 181 182 fsc.s_args = malloc((1+fsc.nargs) * sizeof(char*)); 183 memset(fsc.s_args, 0, fsc.nargs * sizeof(char*)); 184 fsc.sc = sc; 185 186 /* 187 * At this point, we set up the system call arguments. 188 * We ignore any OUT ones, however -- those are arguments that 189 * are set by the system call, and so are probably meaningless 190 * now. This doesn't currently support arguments that are 191 * passed in *and* out, however. 192 */ 193 194 if (fsc.name) { 195 196#if DEBUG 197 fprintf(stderr, "syscall %s(", fsc.name); 198#endif 199 for (i = 0; i < fsc.nargs; i++) { 200#if DEBUG 201 fprintf(stderr, "0x%x%s", 202 sc 203 ? fsc.args[sc->args[i].offset] 204 : fsc.args[i], 205 i < (fsc.nargs - 1) ? "," : ""); 206#endif 207 if (sc && !(sc->args[i].type & OUT)) { 208 fsc.s_args[i] = print_arg(Procfd, &sc->args[i], fsc.args); 209 } 210 } 211#if DEBUG 212 fprintf(stderr, ")\n"); 213#endif 214 } 215 216#if DEBUG 217 fprintf(trussinfo->outfile, "\n"); 218#endif 219 220 /* 221 * Some system calls should be printed out before they are done -- 222 * execve() and exit(), for example, never return. Possibly change 223 * this to work for any system call that doesn't have an OUT 224 * parameter? 225 */ 226 227 if (!strcmp(fsc.name, "execve") || !strcmp(fsc.name, "exit")) { 228 229 /* XXX 230 * This could be done in a more general 231 * manner but it still wouldn't be very pretty. 232 */ 233 if (!strcmp(fsc.name, "execve")) { 234 if ((trussinfo->flags & EXECVEARGS) == 0) 235 if (fsc.s_args[1]) { 236 free(fsc.s_args[1]); 237 fsc.s_args[1] = NULL; 238 } 239 if ((trussinfo->flags & EXECVEENVS) == 0) 240 if (fsc.s_args[2]) { 241 free(fsc.s_args[2]); 242 fsc.s_args[2] = NULL; 243 } 244 } 245 246 print_syscall(trussinfo, fsc.name, fsc.nargs, fsc.s_args); 247 fprintf(trussinfo->outfile, "\n"); 248 } 249 250 return; 251} 252 253/* 254 * And when the system call is done, we handle it here. 255 * Currently, no attempt is made to ensure that the system calls 256 * match -- this needs to be fixed (and is, in fact, why S_SCX includes 257 * the sytem call number instead of, say, an error status). 258 */ 259 260int 261ia64_syscall_exit(struct trussinfo *trussinfo, int syscall_num __unused) { 262 char buf[32]; 263 struct reg regs; 264 int retval; 265 int i; 266 int errorp; 267 struct syscall *sc; 268 269 if (fd == -1 || trussinfo->pid != cpid) { 270 sprintf(buf, "/proc/%d/regs", trussinfo->pid); 271 fd = open(buf, O_RDONLY); 272 if (fd == -1) { 273 fprintf(trussinfo->outfile, "-- CANNOT OPEN REGISTERS --\n"); 274 return (-1); 275 } 276 cpid = trussinfo->pid; 277 } 278 279 lseek(fd, 0L, 0); 280 if (read(fd, ®s, sizeof(regs)) != sizeof(regs)) { 281 fprintf(trussinfo->outfile, "-- CANNOT READ REGISTERS --\n"); 282 return (-1); 283 } 284 retval = regs.r_scratch.gr8; 285 errorp = (regs.r_scratch.gr10 != 0) ? 1 : 0; 286 287 /* 288 * This code, while simpler than the initial versions I used, could 289 * stand some significant cleaning. 290 */ 291 292 sc = fsc.sc; 293 if (!sc) { 294 for (i = 0; i < fsc.nargs; i++) { 295 fsc.s_args[i] = malloc(12); 296 sprintf(fsc.s_args[i], "0x%lx", fsc.args[i]); 297 } 298 } else { 299 /* 300 * Here, we only look for arguments that have OUT masked in -- 301 * otherwise, they were handled in the syscall_entry function. 302 */ 303 for (i = 0; i < sc->nargs; i++) { 304 char *temp; 305 if (sc->args[i].type & OUT) { 306 /* 307 * If an error occurred, than don't bothe getting the data; 308 * it may not be valid. 309 */ 310 if (errorp) { 311 temp = malloc(12); 312 sprintf(temp, "0x%lx", fsc.args[sc->args[i].offset]); 313 } else { 314 temp = print_arg(Procfd, &sc->args[i], fsc.args); 315 } 316 fsc.s_args[i] = temp; 317 } 318 } 319 } 320 321 /* 322 * It would probably be a good idea to merge the error handling, 323 * but that complicates things considerably. 324 */ 325 326 print_syscall_ret(trussinfo, fsc.name, fsc.nargs, fsc.s_args, errorp, retval); 327 clear_fsc(); 328 329 return (retval); 330} 331