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     const char *name;
  17     const char *format;
  18     void (*call)(const struct syscallname *,
  19                  abi_long, abi_long, abi_long,
  20                  abi_long, abi_long, abi_long);
  21     void (*result)(const struct syscallname *, abi_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 #ifdef TARGET_NR__newselect
  78 static void
  79 print_fdset(int n, abi_ulong target_fds_addr)
  80 {
  81     int i;
  82
  83     gemu_log("[");
  84     if( target_fds_addr ) {
  85         abi_long *target_fds;
  86
  87         target_fds = lock_user(VERIFY_READ,
  88                                target_fds_addr,
  89                                sizeof(*target_fds)*(n / TARGET_ABI_BITS + 1),
  90                                1);
  91
  92         if (!target_fds)
  93             return;
  94
  95         for (i=n; i>=0; i--) {
  96             if ((tswapl(target_fds[i / TARGET_ABI_BITS]) >> (i & (TARGET_ABI_BITS - 1))) & 1)
  97                 gemu_log("%d,", i );
  98             }
  99         unlock_user(target_fds, target_fds_addr, 0);
 100     }
 101     gemu_log("]");
 102 }
 103
 104 static void
 105 print_timeval(abi_ulong tv_addr)
 106 {
 107     if( tv_addr ) {
 108         struct target_timeval *tv;
 109
 110         tv = lock_user(VERIFY_READ, tv_addr, sizeof(*tv), 1);
 111         if (!tv)
 112             return;
 113         gemu_log("{" TARGET_ABI_FMT_ld "," TARGET_ABI_FMT_ld "}",
 114                  tv->tv_sec, tv->tv_usec);
 115         unlock_user(tv, tv_addr, 0);
 116     } else
 117         gemu_log("NULL");
 118 }
 119 #endif
 120
 121 /*
 122  * Sysycall specific output functions
 123  */
 124
 125 /* select */
 126 #ifdef TARGET_NR__newselect
 127 static long newselect_arg1 = 0;
 128 static long newselect_arg2 = 0;
 129 static long newselect_arg3 = 0;
 130 static long newselect_arg4 = 0;
 131 static long newselect_arg5 = 0;
 132
 133 static void
 134 print_newselect(const struct syscallname *name,
 135                 abi_long arg1, abi_long arg2, abi_long arg3,
 136                 abi_long arg4, abi_long arg5, abi_long arg6)
 137 {
 138     gemu_log("%s(" TARGET_ABI_FMT_ld ",", name->name, arg1);
 139     print_fdset(arg1, arg2);
 140     gemu_log(",");
 141     print_fdset(arg1, arg3);
 142     gemu_log(",");
 143     print_fdset(arg1, arg4);
 144     gemu_log(",");
 145     print_timeval(arg5);
 146     gemu_log(")");
 147
 148     /* save for use in the return output function below */
 149     newselect_arg1=arg1;
 150     newselect_arg2=arg2;
 151     newselect_arg3=arg3;
 152     newselect_arg4=arg4;
 153     newselect_arg5=arg5;
 154 }
 155 #endif
 156
 157 #ifdef TARGET_NR_semctl
 158 static void
 159 print_semctl(const struct syscallname *name,
 160              abi_long arg1, abi_long arg2, abi_long arg3,
 161              abi_long arg4, abi_long arg5, abi_long arg6)
 162 {
 163     gemu_log("%s(" TARGET_ABI_FMT_ld "," TARGET_ABI_FMT_ld ",", name->name, arg1, arg2);
 164     print_ipc_cmd(arg3);
 165     gemu_log(",0x" TARGET_ABI_FMT_lx ")", arg4);
 166 }
 167 #endif
 168
 169 static void
 170 print_execve(const struct syscallname *name,
 171              abi_long arg1, abi_long arg2, abi_long arg3,
 172              abi_long arg4, abi_long arg5, abi_long arg6)
 173 {
 174     abi_ulong arg_ptr_addr;
 175     char *s;
 176
 177     if (!(s = lock_user_string(arg1)))
 178         return;
 179     gemu_log("%s(\"%s\",{", name->name, s);
 180     unlock_user(s, arg1, 0);
 181
 182     for (arg_ptr_addr = arg2; ; arg_ptr_addr += sizeof(abi_ulong)) {
 183         abi_ulong *arg_ptr, arg_addr;
 184
 185         arg_ptr = lock_user(VERIFY_READ, arg_ptr_addr, sizeof(abi_ulong), 1);
 186         if (!arg_ptr)
 187             return;
 188         arg_addr = tswapl(*arg_ptr);
 189         unlock_user(arg_ptr, arg_ptr_addr, 0);
 190         if (!arg_addr)
 191             break;
 192         if ((s = lock_user_string(arg_addr))) {
 193             gemu_log("\"%s\",", s);
 194             unlock_user(s, arg_addr, 0);
 195         }
 196     }
 197
 198     gemu_log("NULL})");
 199 }
 200
 201 #ifdef TARGET_NR_ipc
 202 static void
 203 print_ipc(const struct syscallname *name,
 204           abi_long arg1, abi_long arg2, abi_long arg3,
 205           abi_long arg4, abi_long arg5, abi_long arg6)
 206 {
 207     switch(arg1) {
 208     case IPCOP_semctl:
 209         gemu_log("semctl(" TARGET_ABI_FMT_ld "," TARGET_ABI_FMT_ld ",", arg1, arg2);
 210         print_ipc_cmd(arg3);
 211         gemu_log(",0x" TARGET_ABI_FMT_lx ")", arg4);
 212         break;
 213     default:
 214         gemu_log("%s(" TARGET_ABI_FMT_ld "," TARGET_ABI_FMT_ld "," TARGET_ABI_FMT_ld "," TARGET_ABI_FMT_ld ")",
 215                  name->name, arg1, arg2, arg3, arg4);
 216     }
 217 }
 218 #endif
 219
 220 /*
 221  * Variants for the return value output function
 222  */
 223
 224 static void
 225 print_syscall_ret_addr(const struct syscallname *name, abi_long ret)
 226 {
 227 if( ret == -1 ) {
 228         gemu_log(" = -1 errno=%d (%s)\n", errno, target_strerror(errno));
 229     } else {
 230         gemu_log(" = 0x" TARGET_ABI_FMT_lx "\n", ret);
 231     }
 232 }
 233
 234 #if 0 /* currently unused */
 235 static void
 236 print_syscall_ret_raw(struct syscallname *name, abi_long ret)
 237 {
 238         gemu_log(" = 0x" TARGET_ABI_FMT_lx "\n", ret);
 239 }
 240 #endif
 241
 242 #ifdef TARGET_NR__newselect
 243 static void
 244 print_syscall_ret_newselect(const struct syscallname *name, abi_long ret)
 245 {
 246     gemu_log(" = 0x" TARGET_ABI_FMT_lx " (", ret);
 247     print_fdset(newselect_arg1,newselect_arg2);
 248     gemu_log(",");
 249     print_fdset(newselect_arg1,newselect_arg3);
 250     gemu_log(",");
 251     print_fdset(newselect_arg1,newselect_arg4);
 252     gemu_log(",");
 253     print_timeval(newselect_arg5);
 254     gemu_log(")\n");
 255 }
 256 #endif
 257
 258 /*
 259  * An array of all of the syscalls we know about
 260  */
 261
 262 static const struct syscallname scnames[] = {
 263 #include "strace.list"
 264 };
 265
 266 static int nsyscalls = sizeof(scnames)/sizeof(struct syscallname);
 267
 268 /*
 269  * The public interface to this module.
 270  */
 271 void
 272 print_syscall(int num,
 273               abi_long arg1, abi_long arg2, abi_long arg3,
 274               abi_long arg4, abi_long arg5, abi_long arg6)
 275 {
 276     int i;
 277     const char *format="%s(" TARGET_ABI_FMT_ld "," TARGET_ABI_FMT_ld "," TARGET_ABI_FMT_ld "," TARGET_ABI_FMT_ld "," TARGET_ABI_FMT_ld "," TARGET_ABI_FMT_ld ")";
 278
 279     gemu_log("%d ", getpid() );
 280
 281     for(i=0;i<nsyscalls;i++)
 282         if( scnames[i].nr == num ) {
 283             if( scnames[i].call != NULL ) {
 284                 scnames[i].call(&scnames[i],arg1,arg2,arg3,arg4,arg5,arg6);
 285             } else {
 286                 /* XXX: this format system is broken because it uses
 287                    host types and host pointers for strings */
 288                 if( scnames[i].format != NULL )
 289                     format = scnames[i].format;
 290                 gemu_log(format,scnames[i].name, arg1,arg2,arg3,arg4,arg5,arg6);
 291             }
 292             return;
 293         }
 294     gemu_log("Unknown syscall %d\n", num);
 295 }
 296
 297
 298 void
 299 print_syscall_ret(int num, abi_long ret)
 300 {
 301     int i;
 302
 303     for(i=0;i<nsyscalls;i++)
 304         if( scnames[i].nr == num ) {
 305             if( scnames[i].result != NULL ) {
 306                 scnames[i].result(&scnames[i],ret);
 307             } else {
 308                 if( ret < 0 ) {
 309                     gemu_log(" = -1 errno=" TARGET_ABI_FMT_ld " (%s)\n", -ret, target_strerror(-ret));
 310                 } else {
 311                     gemu_log(" = " TARGET_ABI_FMT_ld "\n", ret);
 312                 }
 313             }
 314             break;
 315         }
 316 }
 317