bsd-user/strace.c

   1 /*
   2  *  System call tracing and debugging
   3  *
   4  *
   5  *  This program is free software; you can redistribute it and/or modify
   6  *  it under the terms of the GNU General Public License as published by
   7  *  the Free Software Foundation; either version 2 of the License, or
   8  *  (at your option) any later version.
   9  *
  10  *  This program is distributed in the hope that it will be useful,
  11  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  *  GNU General Public License for more details.
  14  *
  15  *  You should have received a copy of the GNU General Public License
  16  *  along with this program; if not, see <http://www.gnu.org/licenses/>.
  17  */
  18
  19 #include "qemu/osdep.h"
  20 #include <sys/select.h>
  21 #include <sys/syscall.h>
  22 #include <sys/ioccom.h>
  23 #include <ctype.h>
  24
  25 #include "qemu.h"
  26
  27 #include "os-strace.h"  /* OS dependent strace print functions */
  28
  29 int do_strace;
  30
  31 /*
  32  * Utility functions
  33  */
  34 static const char *
  35 get_comma(int last)
  36 {
  37     return (last) ? "" : ",";
  38 }
  39
  40 /*
  41  * Prints out raw parameter using given format.  Caller needs
  42  * to do byte swapping if needed.
  43  */
  44 static void
  45 print_raw_param(const char *fmt, abi_long param, int last)
  46 {
  47     char format[64];
  48
  49     (void)snprintf(format, sizeof(format), "%s%s", fmt, get_comma(last));
  50     gemu_log(format, param);
  51 }
  52
  53 static void print_sysctl(const struct syscallname *name, abi_long arg1,
  54         abi_long arg2, abi_long arg3, abi_long arg4, abi_long arg5,
  55         abi_long arg6)
  56 {
  57     uint32_t i;
  58     int32_t *namep;
  59
  60     gemu_log("%s({ ", name->name);
  61     namep = lock_user(VERIFY_READ, arg1, sizeof(int32_t) * arg2, 1);
  62     if (namep) {
  63         int32_t *p = namep;
  64
  65         for (i = 0; i < (uint32_t)arg2; i++) {
  66             gemu_log("%d ", tswap32(*p++));
  67         }
  68         unlock_user(namep, arg1, 0);
  69     }
  70     gemu_log("}, %u, 0x" TARGET_ABI_FMT_lx ", 0x" TARGET_ABI_FMT_lx ", 0x"
  71         TARGET_ABI_FMT_lx ", 0x" TARGET_ABI_FMT_lx ")",
  72         (uint32_t)arg2, arg3, arg4, arg5, arg6);
  73 }
  74
  75 static void print_execve(const struct syscallname *name, abi_long arg1,
  76         abi_long arg2, abi_long arg3, abi_long arg4, abi_long arg5,
  77         abi_long arg6)
  78 {
  79     abi_ulong arg_ptr_addr;
  80     char *s;
  81
  82     s = lock_user_string(arg1);
  83     if (s == NULL) {
  84         return;
  85     }
  86     gemu_log("%s(\"%s\",{", name->name, s);
  87     unlock_user(s, arg1, 0);
  88
  89     for (arg_ptr_addr = arg2; ; arg_ptr_addr += sizeof(abi_ulong)) {
  90         abi_ulong *arg_ptr, arg_addr;
  91
  92         arg_ptr = lock_user(VERIFY_READ, arg_ptr_addr, sizeof(abi_ulong), 1);
  93         if (!arg_ptr) {
  94             return;
  95         }
  96         arg_addr = tswapl(*arg_ptr);
  97         unlock_user(arg_ptr, arg_ptr_addr, 0);
  98         if (!arg_addr) {
  99             break;
 100         }
 101         if ((s = lock_user_string(arg_addr))) {
 102             gemu_log("\"%s\",", s);
 103             unlock_user(s, arg_addr, 0);
 104         }
 105     }
 106     gemu_log("NULL})");
 107 }
 108
 109 static void print_ioctl(const struct syscallname *name,
 110         abi_long arg1, abi_long arg2, abi_long arg3, abi_long arg4,
 111         abi_long arg5, abi_long arg6)
 112 {
 113     /* Decode the ioctl request */
 114     gemu_log("%s(%d, 0x%0lx { IO%s%s GRP:0x%x('%c') CMD:%d LEN:%d }, 0x"
 115             TARGET_ABI_FMT_lx ", ...)",
 116             name->name,
 117             (int)arg1,
 118             (unsigned long)arg2,
 119             arg2 & IOC_OUT ? "R" : "",
 120             arg2 & IOC_IN ? "W" : "",
 121             (unsigned)IOCGROUP(arg2),
 122             isprint(IOCGROUP(arg2)) ? (char)IOCGROUP(arg2) : '?',
 123             (int)arg2 & 0xFF,
 124             (int)IOCPARM_LEN(arg2),
 125             arg3);
 126 }
 127
 128 static void print_sysarch(const struct syscallname *name, abi_long arg1,
 129         abi_long arg2, abi_long arg3, abi_long arg4, abi_long arg5,
 130         abi_long arg6)
 131 {
 132     /* This is os dependent. */
 133     do_os_print_sysarch(name, arg1, arg2, arg3, arg4, arg5, arg6);
 134 }
 135
 136 /*
 137  * Variants for the return value output function
 138  */
 139
 140 static void print_syscall_ret_addr(const struct syscallname *name, abi_long ret)
 141 {
 142     if (ret == -1) {
 143         gemu_log(" = -1 errno=%d (%s)\n", errno, strerror(errno));
 144     } else {
 145         gemu_log(" = 0x" TARGET_ABI_FMT_lx "\n", ret);
 146     }
 147 }
 148
 149 /*
 150  * An array of all of the syscalls we know about
 151  */
 152
 153 static const struct syscallname freebsd_scnames[] = {
 154 #include "freebsd/strace.list"
 155 };
 156 static const struct syscallname netbsd_scnames[] = {
 157 #include "netbsd/strace.list"
 158 };
 159 static const struct syscallname openbsd_scnames[] = {
 160 #include "openbsd/strace.list"
 161 };
 162
 163 static void print_syscall(int num, const struct syscallname *scnames,
 164         unsigned int nscnames, abi_long arg1, abi_long arg2, abi_long arg3,
 165         abi_long arg4, abi_long arg5, abi_long arg6)
 166 {
 167     unsigned int i;
 168     const char *format="%s(" TARGET_ABI_FMT_ld "," TARGET_ABI_FMT_ld ","
 169         TARGET_ABI_FMT_ld "," TARGET_ABI_FMT_ld "," TARGET_ABI_FMT_ld ","
 170         TARGET_ABI_FMT_ld ")";
 171
 172     gemu_log("%d ", getpid() );
 173
 174     for (i = 0; i < nscnames; i++) {
 175         if (scnames[i].nr == num) {
 176             if (scnames[i].call != NULL) {
 177                 scnames[i].call(&scnames[i], arg1, arg2, arg3, arg4, arg5,
 178                         arg6);
 179             } else {
 180                 /* XXX: this format system is broken because it uses
 181                    host types and host pointers for strings */
 182                 if (scnames[i].format != NULL) {
 183                     format = scnames[i].format;
 184                 }
 185                 gemu_log(format, scnames[i].name, arg1, arg2, arg3, arg4, arg5,
 186                         arg6);
 187             }
 188             return;
 189         }
 190     }
 191     gemu_log("Unknown syscall %d\n", num);
 192 }
 193
 194 static void print_syscall_ret(int num, abi_long ret,
 195         const struct syscallname *scnames, unsigned int nscnames)
 196 {
 197     unsigned int i;
 198
 199     for (i = 0; i < nscnames; i++) {
 200         if (scnames[i].nr == num) {
 201             if (scnames[i].result != NULL) {
 202                 scnames[i].result(&scnames[i], ret);
 203             } else {
 204                 if (ret < 0) {
 205                     gemu_log(" = -1 errno=" TARGET_ABI_FMT_ld " (%s)\n", -ret,
 206                              strerror(-ret));
 207                 } else {
 208                     gemu_log(" = " TARGET_ABI_FMT_ld "\n", ret);
 209                 }
 210             }
 211             break;
 212         }
 213     }
 214 }
 215
 216 /*
 217  * The public interface to this module.
 218  */
 219 void print_freebsd_syscall(int num, abi_long arg1, abi_long arg2, abi_long arg3,
 220         abi_long arg4, abi_long arg5, abi_long arg6)
 221 {
 222
 223     print_syscall(num, freebsd_scnames, ARRAY_SIZE(freebsd_scnames), arg1, arg2,
 224             arg3, arg4, arg5, arg6);
 225 }
 226
 227 void print_freebsd_syscall_ret(int num, abi_long ret)
 228 {
 229
 230     print_syscall_ret(num, ret, freebsd_scnames, ARRAY_SIZE(freebsd_scnames));
 231 }
 232
 233 void print_netbsd_syscall(int num, abi_long arg1, abi_long arg2, abi_long arg3,
 234         abi_long arg4, abi_long arg5, abi_long arg6)
 235 {
 236
 237     print_syscall(num, netbsd_scnames, ARRAY_SIZE(netbsd_scnames),
 238                   arg1, arg2, arg3, arg4, arg5, arg6);
 239 }
 240
 241 void print_netbsd_syscall_ret(int num, abi_long ret)
 242 {
 243
 244     print_syscall_ret(num, ret, netbsd_scnames, ARRAY_SIZE(netbsd_scnames));
 245 }
 246
 247 void print_openbsd_syscall(int num, abi_long arg1, abi_long arg2, abi_long arg3,
 248         abi_long arg4, abi_long arg5, abi_long arg6)
 249 {
 250
 251     print_syscall(num, openbsd_scnames, ARRAY_SIZE(openbsd_scnames), arg1, arg2,
 252             arg3, arg4, arg5, arg6);
 253 }
 254
 255 void print_openbsd_syscall_ret(int num, abi_long ret)
 256 {
 257
 258     print_syscall_ret(num, ret, openbsd_scnames, ARRAY_SIZE(openbsd_scnames));
 259 }
 260
 261 static void
 262 print_signal(abi_ulong arg, int last)
 263 {
 264     const char *signal_name = NULL;
 265     switch (arg) {
 266     case TARGET_SIGHUP:
 267         signal_name = "SIGHUP";
 268         break;
 269     case TARGET_SIGINT:
 270         signal_name = "SIGINT";
 271         break;
 272     case TARGET_SIGQUIT:
 273         signal_name = "SIGQUIT";
 274         break;
 275     case TARGET_SIGILL:
 276         signal_name = "SIGILL";
 277         break;
 278     case TARGET_SIGABRT:
 279         signal_name = "SIGABRT";
 280         break;
 281     case TARGET_SIGFPE:
 282         signal_name = "SIGFPE";
 283         break;
 284     case TARGET_SIGKILL:
 285         signal_name = "SIGKILL";
 286         break;
 287     case TARGET_SIGSEGV:
 288         signal_name = "SIGSEGV";
 289         break;
 290     case TARGET_SIGPIPE:
 291         signal_name = "SIGPIPE";
 292         break;
 293     case TARGET_SIGALRM:
 294         signal_name = "SIGALRM";
 295         break;
 296     case TARGET_SIGTERM:
 297         signal_name = "SIGTERM";
 298         break;
 299     case TARGET_SIGUSR1:
 300         signal_name = "SIGUSR1";
 301         break;
 302     case TARGET_SIGUSR2:
 303         signal_name = "SIGUSR2";
 304         break;
 305     case TARGET_SIGCHLD:
 306         signal_name = "SIGCHLD";
 307         break;
 308     case TARGET_SIGCONT:
 309         signal_name = "SIGCONT";
 310         break;
 311     case TARGET_SIGSTOP:
 312         signal_name = "SIGSTOP";
 313         break;
 314     case TARGET_SIGTTIN:
 315         signal_name = "SIGTTIN";
 316         break;
 317     case TARGET_SIGTTOU:
 318         signal_name = "SIGTTOU";
 319         break;
 320     }
 321     if (signal_name == NULL) {
 322         print_raw_param("%ld", arg, last);
 323         return;
 324     }
 325     gemu_log("%s%s", signal_name, get_comma(last));
 326 }
 327
 328 void print_taken_signal(int target_signum, const target_siginfo_t *tinfo)
 329 {
 330     /*
 331      * Print the strace output for a signal being taken:
 332      * --- SIGSEGV {si_signo=SIGSEGV, si_code=SI_KERNEL, si_addr=0} ---
 333      */
 334     gemu_log("%d ", getpid());
 335     gemu_log("--- ");
 336     print_signal(target_signum, 1);
 337     gemu_log(" ---\n");
 338 }