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         target_long *target_fds;
  85
  86         if (!access_ok(VERIFY_READ, target_fds_addr, sizeof(*target_fds)*(n / TARGET_LONG_BITS + 1)))
  87             return;
  88
  89         target_fds = lock_user(target_fds_addr, sizeof(*target_fds)*(n / TARGET_LONG_BITS + 1), 1);
  90         for (i=n; i>=0; i--) {
  91             if ((tswapl(target_fds[i / TARGET_LONG_BITS]) >> (i & (TARGET_LONG_BITS - 1))) & 1)
  92                 gemu_log("%d,", i );
  93             }
  94         unlock_user(target_fds, target_fds_addr, 0);
  95     }
  96     gemu_log("]");
  97 }
  98
  99 static void
 100 print_timeval(target_ulong tv_addr)
 101 {
 102     if( tv_addr ) {
 103         struct target_timeval *tv;
 104
 105         if (!access_ok(VERIFY_READ, tv_addr, sizeof(*tv)))
 106             return;
 107
 108         tv = lock_user(tv_addr, sizeof(*tv), 1);
 109         gemu_log("{" TARGET_ABI_FMT_ld "," TARGET_ABI_FMT_ld "}",
 110                  tv->tv_sec, tv->tv_usec);
 111         unlock_user(tv, tv_addr, 0);
 112     } else
 113         gemu_log("NULL");
 114 }
 115
 116 /*
 117  * Sysycall specific output functions
 118  */
 119
 120 /* select */
 121 static long newselect_arg1 = 0;
 122 static long newselect_arg2 = 0;
 123 static long newselect_arg3 = 0;
 124 static long newselect_arg4 = 0;
 125 static long newselect_arg5 = 0;
 126
 127 static void
 128 print_newselect(struct syscallname *name,
 129                 target_long arg1, target_long arg2, target_long arg3,
 130                 target_long arg4, target_long arg5, target_long arg6)
 131 {
 132     gemu_log("%s(" TARGET_FMT_ld ",", name->name, arg1);
 133     print_fdset(arg1, arg2);
 134     gemu_log(",");
 135     print_fdset(arg1, arg3);
 136     gemu_log(",");
 137     print_fdset(arg1, arg4);
 138     gemu_log(",");
 139     print_timeval(arg5);
 140     gemu_log(")");
 141
 142     /* save for use in the return output function below */
 143     newselect_arg1=arg1;
 144     newselect_arg2=arg2;
 145     newselect_arg3=arg3;
 146     newselect_arg4=arg4;
 147     newselect_arg5=arg5;
 148 }
 149
 150 static void
 151 print_semctl(struct syscallname *name,
 152              target_long arg1, target_long arg2, target_long arg3,
 153              target_long arg4, target_long arg5, target_long arg6)
 154 {
 155     gemu_log("%s(" TARGET_FMT_ld "," TARGET_FMT_ld ",", name->name, arg1, arg2);
 156     print_ipc_cmd(arg3);
 157     gemu_log(",0x" TARGET_FMT_lx ")", arg4);
 158 }
 159
 160 static void
 161 print_execve(struct syscallname *name,
 162              target_long arg1, target_long arg2, target_long arg3,
 163              target_long arg4, target_long arg5, target_long arg6)
 164 {
 165     target_ulong arg_ptr_addr;
 166     char *s;
 167
 168     if (!access_ok(VERIFY_READ, arg1, 1))
 169         return;
 170
 171     s = lock_user_string(arg1);
 172     gemu_log("%s(\"%s\",{", name->name, s);
 173     unlock_user(s, arg1, 0);
 174
 175     for (arg_ptr_addr = arg2; ; arg_ptr_addr += sizeof(target_ulong)) {
 176         target_ulong *arg_ptr, arg_addr, s_addr;
 177
 178         if (!access_ok(VERIFY_READ, arg_ptr_addr, sizeof(target_ulong)))
 179             return;
 180
 181         arg_ptr = lock_user(arg_ptr_addr, sizeof(target_ulong), 1);
 182         arg_addr = tswapl(*arg_ptr);
 183         unlock_user(arg_ptr, arg_ptr_addr, 0);
 184         if (!arg_addr)
 185             break;
 186         s = lock_user_string(arg_addr);
 187         gemu_log("\"%s\",", s);
 188         unlock_user(s, s_addr, 0);
 189     }
 190
 191     gemu_log("NULL})");
 192 }
 193
 194 static void
 195 print_ipc(struct syscallname *name,
 196           target_long arg1, target_long arg2, target_long arg3,
 197           target_long arg4, target_long arg5, target_long arg6)
 198 {
 199     switch(arg1) {
 200     case IPCOP_semctl:
 201         name->name = "semctl";
 202         print_semctl(name,arg2,arg3,arg4,arg5,arg6,0);
 203         break;
 204     default:
 205         gemu_log("%s(" TARGET_FMT_ld "," TARGET_FMT_ld "," TARGET_FMT_ld "," TARGET_FMT_ld ")",
 206                  name->name, arg1, arg2, arg3, arg4);
 207     }
 208 }
 209
 210 /*
 211  * Variants for the return value output function
 212  */
 213
 214 static void
 215 print_syscall_ret_addr(struct syscallname *name, target_long ret)
 216 {
 217 if( ret == -1 ) {
 218         gemu_log(" = -1 errno=%d (%s)\n", errno, target_strerror(errno));
 219     } else {
 220         gemu_log(" = " TARGET_FMT_lx "\n", ret);
 221     }
 222 }
 223
 224 #if 0 /* currently unused */
 225 static void
 226 print_syscall_ret_raw(struct syscallname *name, target_long ret)
 227 {
 228         gemu_log(" = " TARGET_FMT_lx "\n", ret);
 229 }
 230 #endif
 231
 232 #ifdef TARGET_NR__newselect
 233 static void
 234 print_syscall_ret_newselect(struct syscallname *name, target_long ret)
 235 {
 236     gemu_log(" = " TARGET_FMT_lx " (", ret);
 237     print_fdset(newselect_arg1,newselect_arg2);
 238     gemu_log(",");
 239     print_fdset(newselect_arg1,newselect_arg3);
 240     gemu_log(",");
 241     print_fdset(newselect_arg1,newselect_arg4);
 242     gemu_log(",");
 243     print_timeval(newselect_arg5);
 244     gemu_log(")\n");
 245 }
 246 #endif
 247
 248 /*
 249  * An array of all of the syscalls we know about
 250  */
 251
 252 static struct syscallname scnames[] = {
 253 #include "strace.list"
 254 };
 255
 256 static int nsyscalls = sizeof(scnames)/sizeof(struct syscallname);
 257
 258 /*
 259  * The public interface to this module.
 260  */
 261 void
 262 print_syscall(int num,
 263               target_long arg1, target_long arg2, target_long arg3,
 264               target_long arg4, target_long arg5, target_long arg6)
 265 {
 266     int i;
 267     char *format="%s(%ld,%ld,%ld,%ld,%ld,%ld)";
 268
 269     gemu_log("%d ", getpid() );
 270
 271     for(i=0;i<nsyscalls;i++)
 272         if( scnames[i].nr == num ) {
 273             if( scnames[i].call != NULL ) {
 274                 scnames[i].call(&scnames[i],arg1,arg2,arg3,arg4,arg5,arg6);
 275             } else {
 276                 if( scnames[i].format != NULL )
 277                     format = scnames[i].format;
 278                 gemu_log(format,scnames[i].name, arg1,arg2,arg3,arg4,arg5,arg6);
 279             }
 280             break;
 281         }
 282 }
 283
 284
 285 void
 286 print_syscall_ret(int num, target_long ret)
 287 {
 288     int i;
 289
 290     for(i=0;i<nsyscalls;i++)
 291         if( scnames[i].nr == num ) {
 292             if( scnames[i].result != NULL ) {
 293                 scnames[i].result(&scnames[i],ret);
 294             } else {
 295                 if( ret < 0 ) {
 296                     gemu_log(" = -1 errno=%d (%s)\n", -ret, target_strerror(-ret));
 297                 } else {
 298                     gemu_log(" = %d\n", ret);
 299                 }
 300             }
 301             break;
 302         }
 303 }
 304