linux-user/strace.c

   1 #include <stdio.h>
   2 #include <errno.h>
   3 #include <sys/ipc.h>
   4 #include <sys/msg.h>
   5 #include <sys/sem.h>
   6 #include <sys/shm.h>
   7 #include <sys/select.h>
   8 #include <sys/types.h>
   9 #include <unistd.h>
  10 #include "qemu.h"
  11
  12 int do_strace=0;
  13
  14 struct syscallname {
  15     int nr;
  16     char *name;
  17     char *format;
  18     void (*call)(struct syscallname *,
  19                  target_long, target_long, target_long,
  20                  target_long, target_long, target_long);
  21     void (*result)(struct syscallname *, target_long);
  22 };
  23
  24 /*
  25  * Utility functions
  26  */
  27 static void
  28 print_ipc_cmd(int cmd)
  29 {
  30 #define output_cmd(val) \
  31 if( cmd == val ) { \
  32     gemu_log(#val); \
  33     return; \
  34 }
  35
  36     cmd &= 0xff;
  37
  38     /* General IPC commands */
  39     output_cmd( IPC_RMID );
  40     output_cmd( IPC_SET );
  41     output_cmd( IPC_STAT );
  42     output_cmd( IPC_INFO );
  43     /* msgctl() commands */
  44     #ifdef __USER_MISC
  45     output_cmd( MSG_STAT );
  46     output_cmd( MSG_INFO );
  47     #endif
  48     /* shmctl() commands */
  49     output_cmd( SHM_LOCK );
  50     output_cmd( SHM_UNLOCK );
  51     output_cmd( SHM_STAT );
  52     output_cmd( SHM_INFO );
  53     /* semctl() commands */
  54     output_cmd( GETPID );
  55     output_cmd( GETVAL );
  56     output_cmd( GETALL );
  57     output_cmd( GETNCNT );
  58     output_cmd( GETZCNT );
  59     output_cmd( SETVAL );
  60     output_cmd( SETALL );
  61     output_cmd( SEM_STAT );
  62     output_cmd( SEM_INFO );
  63     output_cmd( IPC_RMID );
  64     output_cmd( IPC_RMID );
  65     output_cmd( IPC_RMID );
  66     output_cmd( IPC_RMID );
  67     output_cmd( IPC_RMID );
  68     output_cmd( IPC_RMID );
  69     output_cmd( IPC_RMID );
  70     output_cmd( IPC_RMID );
  71     output_cmd( IPC_RMID );
  72
  73     /* Some value we don't recognize */
  74     gemu_log("%d",cmd);
  75 }
  76
  77 static void
  78 print_fdset(int n, target_ulong target_fds_addr)
  79 {
  80     int i;
  81
  82     gemu_log("[");
  83     if( target_fds_addr ) {
  84         abi_long *target_fds;
  85
  86         target_fds = lock_user(VERIFY_READ,
  87                                target_fds_addr,
  88                                sizeof(*target_fds)*(n / TARGET_ABI_BITS + 1),
  89                                1);
  90
  91         if (!target_fds)
  92             return;
  93
  94         for (i=n; i>=0; i--) {
  95             if ((tswapl(target_fds[i / TARGET_ABI_BITS]) >> (i & (TARGET_ABI_BITS - 1))) & 1)
  96                 gemu_log("%d,", i );
  97             }
  98         unlock_user(target_fds, target_fds_addr, 0);
  99     }
 100     gemu_log("]");
 101 }
 102
 103 static void
 104 print_timeval(target_ulong tv_addr)
 105 {
 106     if( tv_addr ) {
 107         struct target_timeval *tv;
 108
 109         tv = lock_user(VERIFY_READ, tv_addr, sizeof(*tv), 1);
 110         if (!tv)
 111             return;
 112         gemu_log("{" TARGET_ABI_FMT_ld "," TARGET_ABI_FMT_ld "}",
 113                  tv->tv_sec, tv->tv_usec);
 114         unlock_user(tv, tv_addr, 0);
 115     } else
 116         gemu_log("NULL");
 117 }
 118
 119 /*
 120  * Sysycall specific output functions
 121  */
 122
 123 /* select */
 124 static long newselect_arg1 = 0;
 125 static long newselect_arg2 = 0;
 126 static long newselect_arg3 = 0;
 127 static long newselect_arg4 = 0;
 128 static long newselect_arg5 = 0;
 129
 130 static void
 131 print_newselect(struct syscallname *name,
 132                 target_long arg1, target_long arg2, target_long arg3,
 133                 target_long arg4, target_long arg5, target_long arg6)
 134 {
 135     gemu_log("%s(" TARGET_FMT_ld ",", name->name, arg1);
 136     print_fdset(arg1, arg2);
 137     gemu_log(",");
 138     print_fdset(arg1, arg3);
 139     gemu_log(",");
 140     print_fdset(arg1, arg4);
 141     gemu_log(",");
 142     print_timeval(arg5);
 143     gemu_log(")");
 144
 145     /* save for use in the return output function below */
 146     newselect_arg1=arg1;
 147     newselect_arg2=arg2;
 148     newselect_arg3=arg3;
 149     newselect_arg4=arg4;
 150     newselect_arg5=arg5;
 151 }
 152
 153 static void
 154 print_semctl(struct syscallname *name,
 155              target_long arg1, target_long arg2, target_long arg3,
 156              target_long arg4, target_long arg5, target_long arg6)
 157 {
 158     gemu_log("%s(" TARGET_FMT_ld "," TARGET_FMT_ld ",", name->name, arg1, arg2);
 159     print_ipc_cmd(arg3);
 160     gemu_log(",0x" TARGET_FMT_lx ")", arg4);
 161 }
 162
 163 static void
 164 print_execve(struct syscallname *name,
 165              target_long arg1, target_long arg2, target_long arg3,
 166              target_long arg4, target_long arg5, target_long arg6)
 167 {
 168     target_ulong arg_ptr_addr;
 169     char *s;
 170
 171     if (!(s = lock_user_string(arg1)))
 172         return;
 173     gemu_log("%s(\"%s\",{", name->name, s);
 174     unlock_user(s, arg1, 0);
 175
 176     for (arg_ptr_addr = arg2; ; arg_ptr_addr += sizeof(target_ulong)) {
 177         target_ulong *arg_ptr, arg_addr, s_addr;
 178
 179         arg_ptr = lock_user(VERIFY_READ, arg_ptr_addr, sizeof(target_ulong), 1);
 180         if (!arg_ptr)
 181             return;
 182         arg_addr = tswapl(*arg_ptr);
 183         unlock_user(arg_ptr, arg_ptr_addr, 0);
 184         if (!arg_addr)
 185             break;
 186         if ((s = lock_user_string(arg_addr))) {
 187             gemu_log("\"%s\",", s);
 188             unlock_user(s, s_addr, 0);
 189         }
 190     }
 191
 192     gemu_log("NULL})");
 193 }
 194
 195 static void
 196 print_ipc(struct syscallname *name,
 197           target_long arg1, target_long arg2, target_long arg3,
 198           target_long arg4, target_long arg5, target_long arg6)
 199 {
 200     switch(arg1) {
 201     case IPCOP_semctl:
 202         name->name = "semctl";
 203         print_semctl(name,arg2,arg3,arg4,arg5,arg6,0);
 204         break;
 205     default:
 206         gemu_log("%s(" TARGET_FMT_ld "," TARGET_FMT_ld "," TARGET_FMT_ld "," TARGET_FMT_ld ")",
 207                  name->name, arg1, arg2, arg3, arg4);
 208     }
 209 }
 210
 211 /*
 212  * Variants for the return value output function
 213  */
 214
 215 static void
 216 print_syscall_ret_addr(struct syscallname *name, target_long ret)
 217 {
 218 if( ret == -1 ) {
 219         gemu_log(" = -1 errno=%d (%s)\n", errno, target_strerror(errno));
 220     } else {
 221         gemu_log(" = " TARGET_FMT_lx "\n", ret);
 222     }
 223 }
 224
 225 #if 0 /* currently unused */
 226 static void
 227 print_syscall_ret_raw(struct syscallname *name, target_long ret)
 228 {
 229         gemu_log(" = " TARGET_FMT_lx "\n", ret);
 230 }
 231 #endif
 232
 233 #ifdef TARGET_NR__newselect
 234 static void
 235 print_syscall_ret_newselect(struct syscallname *name, target_long ret)
 236 {
 237     gemu_log(" = " TARGET_FMT_lx " (", ret);
 238     print_fdset(newselect_arg1,newselect_arg2);
 239     gemu_log(",");
 240     print_fdset(newselect_arg1,newselect_arg3);
 241     gemu_log(",");
 242     print_fdset(newselect_arg1,newselect_arg4);
 243     gemu_log(",");
 244     print_timeval(newselect_arg5);
 245     gemu_log(")\n");
 246 }
 247 #endif
 248
 249 /*
 250  * An array of all of the syscalls we know about
 251  */
 252
 253 static struct syscallname scnames[] = {
 254 #include "strace.list"
 255 };
 256
 257 static int nsyscalls = sizeof(scnames)/sizeof(struct syscallname);
 258
 259 /*
 260  * The public interface to this module.
 261  */
 262 void
 263 print_syscall(int num,
 264               target_long arg1, target_long arg2, target_long arg3,
 265               target_long arg4, target_long arg5, target_long arg6)
 266 {
 267     int i;
 268     char *format="%s(%ld,%ld,%ld,%ld,%ld,%ld)";
 269
 270     gemu_log("%d ", getpid() );
 271
 272     for(i=0;i<nsyscalls;i++)
 273         if( scnames[i].nr == num ) {
 274             if( scnames[i].call != NULL ) {
 275                 scnames[i].call(&scnames[i],arg1,arg2,arg3,arg4,arg5,arg6);
 276             } else {
 277                 if( scnames[i].format != NULL )
 278                     format = scnames[i].format;
 279                 gemu_log(format,scnames[i].name, arg1,arg2,arg3,arg4,arg5,arg6);
 280             }
 281             break;
 282         }
 283 }
 284
 285
 286 void
 287 print_syscall_ret(int num, target_long ret)
 288 {
 289     int i;
 290
 291     for(i=0;i<nsyscalls;i++)
 292         if( scnames[i].nr == num ) {
 293             if( scnames[i].result != NULL ) {
 294                 scnames[i].result(&scnames[i],ret);
 295             } else {
 296                 if( ret < 0 ) {
 297                     gemu_log(" = -1 errno=%d (%s)\n", -ret, target_strerror(-ret));
 298                 } else {
 299                     gemu_log(" = %d\n", ret);
 300                 }
 301             }
 302             break;
 303         }
 304 }
 305