ia64-fbsd.c revision 153963
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 153963 2006-01-02 08:36:25Z brian $"; 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; 67 68#include "syscalls.h" 69 70static int nsyscalls = sizeof(syscallnames) / sizeof(syscallnames[0]); 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 */ 81static struct freebsd_syscall { 82 struct syscall *sc; 83 const char *name; 84 int number; 85 unsigned long *args; 86 int nargs; /* number of arguments -- *not* number of words! */ 87 char **s_args; /* the printable arguments */ 88} fsc; 89 90/* Clear up and free parts of the fsc structure. */ 91static __inline void 92clear_fsc(void) { 93 if (fsc.args) { 94 free(fsc.args); 95 } 96 if (fsc.s_args) { 97 int i; 98 for (i = 0; i < fsc.nargs; i++) 99 if (fsc.s_args[i]) 100 free(fsc.s_args[i]); 101 free(fsc.s_args); 102 } 103 memset(&fsc, 0, sizeof(fsc)); 104} 105 106/* 107 * Called when a process has entered a system call. nargs is the 108 * number of words, not number of arguments (a necessary distinction 109 * in some cases). Note that if the STOPEVENT() code in ia64/ia64/trap.c 110 * is ever changed these functions need to keep up. 111 */ 112 113void 114ia64_syscall_entry(struct trussinfo *trussinfo, int nargs) { 115 char buf[32]; 116 struct reg regs; 117 int syscall_num; 118 int i; 119 unsigned long *parm_offset; 120 struct syscall *sc; 121 122 if (fd == -1 || trussinfo->pid != cpid) { 123 sprintf(buf, "/proc/%d/regs", trussinfo->pid); 124 fd = open(buf, O_RDWR); 125 if (fd == -1) { 126 fprintf(trussinfo->outfile, "-- CANNOT OPEN REGISTERS --\n"); 127 return; 128 } 129 cpid = trussinfo->pid; 130 } 131 132 clear_fsc(); 133 lseek(fd, 0L, 0); 134 if (read(fd, ®s, sizeof(regs)) != sizeof(regs)) { 135 fprintf(trussinfo->outfile, "-- CANNOT READ REGISTERS --\n"); 136 return; 137 } 138 parm_offset = ®s.r_scratch.gr16; 139 140 /* 141 * FreeBSD has two special kinds of system call redirctions -- 142 * SYS_syscall, and SYS___syscall. The former is the old syscall() 143 * routine, basicly; the latter is for quad-aligned arguments. 144 */ 145 syscall_num = regs.r_scratch.gr15; /* XXX double-check. */ 146 if (syscall_num == SYS_syscall || syscall_num == SYS___syscall) 147 syscall_num = (int)*parm_offset++; 148 149 fsc.number = syscall_num; 150 fsc.name = (syscall_num < 0 || syscall_num > nsyscalls) 151 ? NULL : syscallnames[syscall_num]; 152 if (!fsc.name) { 153 fprintf(trussinfo->outfile, "-- UNKNOWN SYSCALL %d --\n", syscall_num); 154 } 155 156 if (fsc.name && (trussinfo->flags & FOLLOWFORKS) 157 && ((!strcmp(fsc.name, "fork") 158 || !strcmp(fsc.name, "rfork") 159 || !strcmp(fsc.name, "vfork")))) 160 { 161 trussinfo->in_fork = 1; 162 } 163 164 if (nargs == 0) 165 return; 166 167 fsc.args = malloc((1+nargs) * sizeof(unsigned long)); 168 memcpy(fsc.args, parm_offset, nargs * sizeof(long)); 169 170 sc = get_syscall(fsc.name); 171 if (sc) { 172 fsc.nargs = sc->nargs; 173 } else { 174#if DEBUG 175 fprintf(trussinfo->outfile, "unknown syscall %s -- setting args to %d\n", 176 fsc.name, nargs); 177#endif 178 fsc.nargs = nargs; 179 } 180 181 fsc.s_args = malloc((1+fsc.nargs) * sizeof(char*)); 182 memset(fsc.s_args, 0, fsc.nargs * sizeof(char*)); 183 fsc.sc = sc; 184 185 /* 186 * At this point, we set up the system call arguments. 187 * We ignore any OUT ones, however -- those are arguments that 188 * are set by the system call, and so are probably meaningless 189 * now. This doesn't currently support arguments that are 190 * passed in *and* out, however. 191 */ 192 193 if (fsc.name) { 194 195#if DEBUG 196 fprintf(stderr, "syscall %s(", fsc.name); 197#endif 198 for (i = 0; i < fsc.nargs; i++) { 199#if DEBUG 200 fprintf(stderr, "0x%x%s", 201 sc 202 ? fsc.args[sc->args[i].offset] 203 : fsc.args[i], 204 i < (fsc.nargs - 1) ? "," : ""); 205#endif 206 if (sc && !(sc->args[i].type & OUT)) { 207 fsc.s_args[i] = print_arg(Procfd, &sc->args[i], fsc.args, 0, trussinfo); 208 } 209 } 210#if DEBUG 211 fprintf(stderr, ")\n"); 212#endif 213 } 214 215#if DEBUG 216 fprintf(trussinfo->outfile, "\n"); 217#endif 218 219 /* 220 * Some system calls should be printed out before they are done -- 221 * execve() and exit(), for example, never return. Possibly change 222 * this to work for any system call that doesn't have an OUT 223 * parameter? 224 */ 225 226 if (!strcmp(fsc.name, "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 */ 232 if (!strcmp(fsc.name, "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]); 241 fsc.s_args[2] = NULL; 242 } 243 } 244 245 print_syscall(trussinfo, fsc.name, fsc.nargs, fsc.s_args); 246 fprintf(trussinfo->outfile, "\n"); 247 } 248 249 return; 250} 251 252/* 253 * And when the system call is done, we handle it here. 254 * Currently, no attempt is made to ensure that the system calls 255 * match -- this needs to be fixed (and is, in fact, why S_SCX includes 256 * the sytem call number instead of, say, an error status). 257 */ 258 259long 260ia64_syscall_exit(struct trussinfo *trussinfo, int syscall_num __unused) 261{ 262 char buf[32]; 263 struct reg regs; 264 long 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 asprintf(&fsc.s_args[i], "0x%lx", fsc.args[i]); 296 } else { 297 /* 298 * Here, we only look for arguments that have OUT masked in -- 299 * otherwise, they were handled in the syscall_entry function. 300 */ 301 for (i = 0; i < sc->nargs; i++) { 302 char *temp; 303 if (sc->args[i].type & OUT) { 304 /* 305 * If an error occurred, than don't bothe getting the data; 306 * it may not be valid. 307 */ 308 if (errorp) 309 asprintf(&temp, "0x%lx", fsc.args[sc->args[i].offset]); 310 else 311 temp = print_arg(Procfd, &sc->args[i], fsc.args, retval, trussinfo); 312 fsc.s_args[i] = temp; 313 } 314 } 315 } 316 317 /* 318 * It would probably be a good idea to merge the error handling, 319 * but that complicates things considerably. 320 */ 321 322 print_syscall_ret(trussinfo, fsc.name, fsc.nargs, fsc.s_args, errorp, retval); 323 clear_fsc(); 324 325 return (retval); 326} 327