ia64-fbsd.c revision 240562
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. 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 240562 2012-09-16 14:38:01Z zont $"; 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/ptrace.h> 47#include <sys/syscall.h> 48 49#include <machine/reg.h> 50 51#include <errno.h> 52#include <fcntl.h> 53#include <signal.h> 54#include <stdio.h> 55#include <stdlib.h> 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 64#include "syscalls.h" 65 66static int nsyscalls = sizeof(syscallnames) / sizeof(syscallnames[0]); 67 68/* 69 * This is what this particular file uses to keep track of a system call. 70 * It is probably not quite sufficient -- I can probably use the same 71 * structure for the various syscall personalities, and I also probably 72 * need to nest system calls (for signal handlers). 73 * 74 * 'struct syscall' describes the system call; it may be NULL, however, 75 * if we don't know about this particular system call yet. 76 */ 77struct freebsd_syscall { 78 struct syscall *sc; 79 const char *name; 80 int number; 81 unsigned long *args; 82 int nargs; /* number of arguments -- *not* number of words! */ 83 char **s_args; /* the printable arguments */ 84}; 85 86static struct freebsd_syscall * 87alloc_fsc(void) 88{ 89 90 return (malloc(sizeof(struct freebsd_syscall))); 91} 92 93/* Clear up and free parts of the fsc structure. */ 94static void 95free_fsc(struct freebsd_syscall *fsc) 96{ 97 int i; 98 99 free(fsc->args); 100 if (fsc->s_args) { 101 for (i = 0; i < fsc->nargs; i++) 102 free(fsc->s_args[i]); 103 free(fsc->s_args); 104 } 105 free(fsc); 106} 107 108/* 109 * Called when a process has entered a system call. nargs is the 110 * number of words, not number of arguments (a necessary distinction 111 * in some cases). Note that if the STOPEVENT() code in ia64/ia64/trap.c 112 * is ever changed these functions need to keep up. 113 */ 114 115void 116ia64_syscall_entry(struct trussinfo *trussinfo, int nargs) 117{ 118 struct reg regs; 119 struct freebsd_syscall *fsc; 120 struct syscall *sc; 121 unsigned long *parm_offset; 122 lwpid_t tid; 123 int i, syscall_num; 124 125 tid = trussinfo->curthread->tid; 126 127 if (ptrace(PT_GETREGS, tid, (caddr_t)®s, 0) < 0) { 128 fprintf(trussinfo->outfile, "-- CANNOT READ REGISTERS --\n"); 129 return; 130 } 131 parm_offset = ®s.r_scratch.gr16; 132 133 /* 134 * FreeBSD has two special kinds of system call redirctions -- 135 * SYS_syscall, and SYS___syscall. The former is the old syscall() 136 * routine, basically; the latter is for quad-aligned arguments. 137 */ 138 syscall_num = regs.r_scratch.gr15; /* XXX double-check. */ 139 if (syscall_num == SYS_syscall || syscall_num == SYS___syscall) 140 syscall_num = (int)*parm_offset++; 141 142 fsc = alloc_fsc(); 143 if (fsc == NULL) 144 return; 145 fsc->number = syscall_num; 146 fsc->name = (syscall_num < 0 || syscall_num >= nsyscalls) ? 147 NULL : syscallnames[syscall_num]; 148 if (!fsc->name) { 149 fprintf(trussinfo->outfile, "-- UNKNOWN SYSCALL %d --\n", 150 syscall_num); 151 } 152 153 if (fsc->name && (trussinfo->flags & FOLLOWFORKS) && 154 (strcmp(fsc->name, "fork") == 0 || 155 strcmp(fsc->name, "rfork") == 0 || 156 strcmp(fsc->name, "vfork") == 0)) 157 trussinfo->curthread->in_fork = 1; 158 159 if (nargs == 0) 160 return; 161 162 fsc->args = malloc((1 + nargs) * sizeof(unsigned long)); 163 memcpy(fsc->args, parm_offset, nargs * sizeof(long)); 164 165 sc = get_syscall(fsc->name); 166 if (sc) 167 fsc->nargs = sc->nargs; 168 else { 169#if DEBUG 170 fprintf(trussinfo->outfile, "unknown syscall %s -- setting " 171 "args to %d\n", fsc->name, nargs); 172#endif 173 fsc->nargs = nargs; 174 } 175 176 fsc->s_args = calloc(1, (1 + fsc->nargs) * sizeof(char *)); 177 fsc->sc = sc; 178 179 /* 180 * At this point, we set up the system call arguments. 181 * We ignore any OUT ones, however -- those are arguments that 182 * are set by the system call, and so are probably meaningless 183 * now. This doesn't currently support arguments that are 184 * passed in *and* out, however. 185 */ 186 187 if (fsc->name) { 188#if DEBUG 189 fprintf(stderr, "syscall %s(", fsc->name); 190#endif 191 for (i = 0; i < fsc->nargs; i++) { 192#if DEBUG 193 fprintf(stderr, "0x%x%s", sc ? 194 fsc->args[sc->args[i].offset] : fsc->args[i], 195 i < (fsc->nargs - 1) ? "," : ""); 196#endif 197 if (sc && !(sc->args[i].type & OUT)) { 198 fsc->s_args[i] = print_arg(&sc->args[i], 199 fsc->args, 0, trussinfo); 200 } 201 } 202#if DEBUG 203 fprintf(stderr, ")\n"); 204#endif 205 } 206 207#if DEBUG 208 fprintf(trussinfo->outfile, "\n"); 209#endif 210 211 if (fsc->name != NULL && (strcmp(fsc->name, "execve") == 0 || 212 strcmp(fsc->name, "exit") == 0)) { 213 /* 214 * XXX 215 * This could be done in a more general 216 * manner but it still wouldn't be very pretty. 217 */ 218 if (strcmp(fsc->name, "execve") == 0) { 219 if ((trussinfo->flags & EXECVEARGS) == 0) { 220 if (fsc->s_args[1]) { 221 free(fsc->s_args[1]); 222 fsc->s_args[1] = NULL; 223 } 224 } 225 if ((trussinfo->flags & EXECVEENVS) == 0) { 226 if (fsc->s_args[2]) { 227 free(fsc->s_args[2]); 228 fsc->s_args[2] = NULL; 229 } 230 } 231 } 232 } 233 trussinfo->curthread->fsc = fsc; 234} 235 236/* 237 * And when the system call is done, we handle it here. 238 * Currently, no attempt is made to ensure that the system calls 239 * match -- this needs to be fixed (and is, in fact, why S_SCX includes 240 * the system call number instead of, say, an error status). 241 */ 242 243long 244ia64_syscall_exit(struct trussinfo *trussinfo, int syscall_num __unused) 245{ 246 struct reg regs; 247 struct freebsd_syscall *fsc; 248 struct syscall *sc; 249 lwpid_t tid; 250 long retval; 251 int errorp, i; 252 253 if (trussinfo->curthread->fsc == NULL) 254 return (-1); 255 256 tid = trussinfo->curthread->tid; 257 258 if (ptrace(PT_GETREGS, tid, (caddr_t)®s, 0) < 0) { 259 fprintf(trussinfo->outfile, "-- CANNOT READ REGISTERS --\n"); 260 return (-1); 261 } 262 263 retval = regs.r_scratch.gr8; 264 errorp = (regs.r_scratch.gr10 != 0) ? 1 : 0; 265 266 /* 267 * This code, while simpler than the initial versions I used, could 268 * stand some significant cleaning. 269 */ 270 271 fsc = trussinfo->curthread->fsc; 272 sc = fsc->sc; 273 if (!sc) { 274 for (i = 0; i < fsc->nargs; i++) 275 asprintf(&fsc->s_args[i], "0x%lx", fsc->args[i]); 276 } else { 277 /* 278 * Here, we only look for arguments that have OUT masked in -- 279 * otherwise, they were handled in the syscall_entry function. 280 */ 281 for (i = 0; i < sc->nargs; i++) { 282 char *temp; 283 if (sc->args[i].type & OUT) { 284 /* 285 * If an error occurred, then don't bother 286 * getting the data; it may not be valid. 287 */ 288 if (errorp) { 289 asprintf(&temp, "0x%lx", 290 fsc->args[sc->args[i].offset]); 291 } else { 292 temp = print_arg(&sc->args[i], 293 fsc->args, retval, trussinfo); 294 } 295 fsc->s_args[i] = temp; 296 } 297 } 298 } 299 300 if (fsc->name != NULL && (strcmp(fsc->name, "execve") == 0 || 301 strcmp(fsc->name, "exit") == 0)) 302 trussinfo->curthread->in_syscall = 1; 303 304 /* 305 * It would probably be a good idea to merge the error handling, 306 * but that complicates things considerably. 307 */ 308 309 print_syscall_ret(trussinfo, fsc->name, fsc->nargs, fsc->s_args, errorp, 310 retval, fsc->sc); 311 free_fsc(fsc); 312 313 return (retval); 314} 315