ia64-fbsd.c revision 204977
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 204977 2010-03-10 20:31:30Z imp $"; 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 64static int cpid = -1; 65 66#include "syscalls.h" 67 68static int nsyscalls = sizeof(syscallnames) / sizeof(syscallnames[0]); 69 70/* 71 * This is what this particular file uses to keep track of a system call. 72 * It is probably not quite sufficient -- I can probably use the same 73 * structure for the various syscall personalities, and I also probably 74 * need to nest system calls (for signal handlers). 75 * 76 * 'struct syscall' describes the system call; it may be NULL, however, 77 * if we don't know about this particular system call yet. 78 */ 79static struct freebsd_syscall { 80 struct syscall *sc; 81 const char *name; 82 int number; 83 unsigned long *args; 84 int nargs; /* number of arguments -- *not* number of words! */ 85 char **s_args; /* the printable arguments */ 86} fsc; 87 88/* Clear up and free parts of the fsc structure. */ 89static __inline void 90clear_fsc(void) { 91 if (fsc.args) { 92 free(fsc.args); 93 } 94 if (fsc.s_args) { 95 int i; 96 for (i = 0; i < fsc.nargs; i++) 97 if (fsc.s_args[i]) 98 free(fsc.s_args[i]); 99 free(fsc.s_args); 100 } 101 memset(&fsc, 0, sizeof(fsc)); 102} 103 104/* 105 * Called when a process has entered a system call. nargs is the 106 * number of words, not number of arguments (a necessary distinction 107 * in some cases). Note that if the STOPEVENT() code in ia64/ia64/trap.c 108 * is ever changed these functions need to keep up. 109 */ 110 111void 112ia64_syscall_entry(struct trussinfo *trussinfo, int nargs) { 113 struct reg regs; 114 int syscall_num; 115 int i; 116 unsigned long *parm_offset; 117 struct syscall *sc; 118 119 cpid = trussinfo->curthread->tid; 120 121 clear_fsc(); 122 if (ptrace(PT_GETREGS, cpid, (caddr_t)®s, 0) < 0) { 123 fprintf(trussinfo->outfile, "-- CANNOT READ REGISTERS --\n"); 124 return; 125 } 126 parm_offset = ®s.r_scratch.gr16; 127 128 /* 129 * FreeBSD has two special kinds of system call redirctions -- 130 * SYS_syscall, and SYS___syscall. The former is the old syscall() 131 * routine, basicly; the latter is for quad-aligned arguments. 132 */ 133 syscall_num = regs.r_scratch.gr15; /* XXX double-check. */ 134 if (syscall_num == SYS_syscall || syscall_num == SYS___syscall) 135 syscall_num = (int)*parm_offset++; 136 137 fsc.number = syscall_num; 138 fsc.name = (syscall_num < 0 || syscall_num >= nsyscalls) 139 ? NULL : syscallnames[syscall_num]; 140 if (!fsc.name) { 141 fprintf(trussinfo->outfile, "-- UNKNOWN SYSCALL %d --\n", syscall_num); 142 } 143 144 if (fsc.name && (trussinfo->flags & FOLLOWFORKS) 145 && ((!strcmp(fsc.name, "fork") 146 || !strcmp(fsc.name, "rfork") 147 || !strcmp(fsc.name, "vfork")))) 148 { 149 trussinfo->curthread->in_fork = 1; 150 } 151 152 if (nargs == 0) 153 return; 154 155 fsc.args = malloc((1+nargs) * sizeof(unsigned long)); 156 memcpy(fsc.args, parm_offset, nargs * sizeof(long)); 157 158 sc = get_syscall(fsc.name); 159 if (sc) { 160 fsc.nargs = sc->nargs; 161 } else { 162#if DEBUG 163 fprintf(trussinfo->outfile, "unknown syscall %s -- setting args to %d\n", 164 fsc.name, nargs); 165#endif 166 fsc.nargs = nargs; 167 } 168 169 fsc.s_args = calloc(1, (1+fsc.nargs) * sizeof(char*)); 170 fsc.sc = sc; 171 172 /* 173 * At this point, we set up the system call arguments. 174 * We ignore any OUT ones, however -- those are arguments that 175 * are set by the system call, and so are probably meaningless 176 * now. This doesn't currently support arguments that are 177 * passed in *and* out, however. 178 */ 179 180 if (fsc.name) { 181 182#if DEBUG 183 fprintf(stderr, "syscall %s(", fsc.name); 184#endif 185 for (i = 0; i < fsc.nargs; i++) { 186#if DEBUG 187 fprintf(stderr, "0x%x%s", 188 sc 189 ? fsc.args[sc->args[i].offset] 190 : fsc.args[i], 191 i < (fsc.nargs - 1) ? "," : ""); 192#endif 193 if (sc && !(sc->args[i].type & OUT)) { 194 fsc.s_args[i] = print_arg(&sc->args[i], fsc.args, 0, trussinfo); 195 } 196 } 197#if DEBUG 198 fprintf(stderr, ")\n"); 199#endif 200 } 201 202#if DEBUG 203 fprintf(trussinfo->outfile, "\n"); 204#endif 205 206 if (fsc.name != NULL && 207 (!strcmp(fsc.name, "execve") || !strcmp(fsc.name, "exit"))) { 208 209 /* XXX 210 * This could be done in a more general 211 * manner but it still wouldn't be very pretty. 212 */ 213 if (!strcmp(fsc.name, "execve")) { 214 if ((trussinfo->flags & EXECVEARGS) == 0) 215 if (fsc.s_args[1]) { 216 free(fsc.s_args[1]); 217 fsc.s_args[1] = NULL; 218 } 219 if ((trussinfo->flags & EXECVEENVS) == 0) 220 if (fsc.s_args[2]) { 221 free(fsc.s_args[2]); 222 fsc.s_args[2] = NULL; 223 } 224 } 225 } 226 227 return; 228} 229 230/* 231 * And when the system call is done, we handle it here. 232 * Currently, no attempt is made to ensure that the system calls 233 * match -- this needs to be fixed (and is, in fact, why S_SCX includes 234 * the sytem call number instead of, say, an error status). 235 */ 236 237long 238ia64_syscall_exit(struct trussinfo *trussinfo, int syscall_num __unused) 239{ 240 struct reg regs; 241 long retval; 242 int i; 243 int errorp; 244 struct syscall *sc; 245 246 if (fsc.name == NULL) 247 return (-1); 248 cpid = trussinfo->curthread->tid; 249 250 if (ptrace(PT_GETREGS, cpid, (caddr_t)®s, 0) < 0) { 251 fprintf(trussinfo->outfile, "-- CANNOT READ REGISTERS --\n"); 252 return (-1); 253 } 254 retval = regs.r_scratch.gr8; 255 errorp = (regs.r_scratch.gr10 != 0) ? 1 : 0; 256 257 /* 258 * This code, while simpler than the initial versions I used, could 259 * stand some significant cleaning. 260 */ 261 262 sc = fsc.sc; 263 if (!sc) { 264 for (i = 0; i < fsc.nargs; i++) 265 asprintf(&fsc.s_args[i], "0x%lx", fsc.args[i]); 266 } else { 267 /* 268 * Here, we only look for arguments that have OUT masked in -- 269 * otherwise, they were handled in the syscall_entry function. 270 */ 271 for (i = 0; i < sc->nargs; i++) { 272 char *temp; 273 if (sc->args[i].type & OUT) { 274 /* 275 * If an error occurred, than don't bothe getting the data; 276 * it may not be valid. 277 */ 278 if (errorp) 279 asprintf(&temp, "0x%lx", fsc.args[sc->args[i].offset]); 280 else 281 temp = print_arg(&sc->args[i], fsc.args, retval, trussinfo); 282 fsc.s_args[i] = temp; 283 } 284 } 285 } 286 287 if (fsc.name != NULL && 288 (!strcmp(fsc.name, "execve") || !strcmp(fsc.name, "exit"))) { 289 trussinfo->curthread->in_syscall = 1; 290 } 291 /* 292 * It would probably be a good idea to merge the error handling, 293 * but that complicates things considerably. 294 */ 295 296 print_syscall_ret(trussinfo, fsc.name, fsc.nargs, fsc.s_args, errorp, 297 fsc.sc, retval); 298 clear_fsc(); 299 300 return (retval); 301} 302