commands/mdb/decode.c

   1 /*
   2  * decode.c for mdb -- decodes a Minix system call
   3  */
   4 #include "mdb.h"
   5 #ifdef SYSCALLS_SUPPORT
   6 #include <stdio.h>
   7 #include <stdlib.h>
   8 #include <string.h>
   9 #include <fcntl.h>
  10 #include <sys/stat.h>
  11 #define ptrace mdbtrace
  12 #include <sys/ptrace.h>
  13 #include <minix/type.h>
  14 #include <minix/callnr.h>
  15 #include "proto.h"
  16
  17 static void get_message(message *m, unsigned bx);
  18 static void get_data(char *s, unsigned bx, int cnt);
  19
  20 static message sent;
  21 static message recv;
  22 static unsigned saved_addr;
  23 static int last_call;
  24
  25 #define NOSYS           0
  26 #define NOP             1
  27
  28 #define _M1             0x0100
  29 #define _M2             0x0200
  30 #define _M3             0x0400
  31 #define _M4             0x0800
  32
  33 #define _M13            0x0500
  34
  35 #define M1_I1           (_M1|1)
  36 #define M1_I2           (_M1|2)
  37 #define M1_I3           (_M1|4)
  38 #define M1_P1           (_M1|8)
  39 #define M1_P2           (_M1|16)
  40 #define M1_P3           (_M1|32)
  41
  42 #define M2_I1           (_M2|1)
  43 #define M2_I2           (_M2|2)
  44 #define M2_I3           (_M2|4)
  45 #define M2_L1           (_M2|8)
  46 #define M2_L2           (_M2|16)
  47 #define M2_P1           (_M2|32)
  48
  49 #define M3_I1           (_M3|1)
  50 #define M3_I2           (_M3|2)
  51 #define M3_P1           (_M3|4)
  52 #define M3_C1           (_M3|8)
  53
  54 #define M4_L1           (_M4|1)
  55 #define M4_L2           (_M4|2)
  56 #define M4_L3           (_M4|4)
  57 #define M4_L4           (_M4|8)
  58 #define M4_L5           (_M4|16)
  59
  60 #define M13_OPEN        (_M13|1)
  61
  62 #define M1_I12          (M1_I1|M1_I2)
  63 #define M1_NAME1        (M1_I1|M1_P1)
  64 #define M1_NAME2        (M1_I2|M1_P2)
  65 #define M1_2NAMES       (M1_I1|M1_P1|M1_I2|M1_P2)
  66 #define M1_SIGACTION    (M1_I2|M1_P1|M1_P2|M1_P3)
  67
  68 #define M2_IOCTL        (M2_I1|M2_I3|M2_L1|M2_L2)
  69 #define M2_4P           (M2_I1|M2_I2|M2_L1|M2_L2)
  70 #define M2_SIGRETURN    (M2_I2|M2_L1|M2_P1)
  71 #define M2_SIGPROC      (M2_I1|M2_L1)
  72 #define M2_UTIME        (M2_I1|M2_I2|M2_L1|M2_L2|M2_P1)
  73
  74 #define M3_LOAD         (M3_I1|M3_C1)
  75
  76 struct decode_system {
  77         int syscall;
  78         unsigned int sflag;
  79         unsigned int rflag;
  80         char *name;
  81 } decode[NCALLS] = {
  82         0,              NOSYS,          NOP,    NULL,
  83         EXIT,           M1_I1,          NOP,    "EXIT",
  84         FORK,           NOP,            NOP,    "FORK",
  85         READ,           M1_I12,         NOP,    "READ",
  86         WRITE,          M1_I12,         NOP,    "WRITE",
  87         OPEN,           M13_OPEN,       NOP,    "OPEN",
  88         CLOSE,          M1_I1,          NOP,    "CLOSE",
  89         WAIT,           NOP,            M2_I1,  "WAIT",
  90         CREAT,          M3_LOAD,        NOP,    "CREAT",
  91         LINK,           M1_2NAMES,      NOP,    "LINK",
  92         UNLINK,         M3_LOAD,        NOP,    "UNLINK",
  93         WAITPID,        M1_I1,          M2_I1,  "WAITPID",
  94         CHDIR,          M3_LOAD,        NOP,    "CHDIR",
  95         TIME,           NOP,            M2_L1,  "TIME",
  96         MKNOD,          M1_NAME1,       NOP,    "MKNOD",
  97         CHMOD,          M3_LOAD,        NOP,    "CHMOD",
  98         CHOWN,          M1_NAME1,       NOP,    "CHOWN",
  99         BRK,            M1_P1,          M2_P1,  "BRK",
 100         STAT,           M1_NAME1,       NOP,    "STAT",
 101         LSEEK,          M1_I1,          NOP,    "LSEEK",
 102         MINIX_GETPID,   NOP,            NOP,    "MINIX_GETPID",
 103         MOUNT,          M1_2NAMES,      NOP,    "MOUNT",
 104         UMOUNT,         M3_LOAD,        NOP,    "UMOUNT",
 105         SETUID,         M1_I1,          NOP,    "SETUID",
 106         GETUID,         NOP,            NOP,    "GETUID",
 107         STIME,          M2_L1,          NOP,    "STIME",
 108         PTRACE,         M2_4P,          NOP,    "PTRACE",
 109         ALARM,          M1_I1,          NOP,    "ALARM",
 110         FSTAT,          M1_I1,          NOP,    "FSTAT",
 111         PAUSE,          NOP,            NOP,    "PAUSE",
 112         UTIME,          M2_UTIME,       NOP,    "UTIME",
 113         31,             NOSYS,          NOP,    NULL,
 114         32,             NOSYS,          NOP,    NULL,
 115         ACCESS,         M3_LOAD,        NOP,    "ACCESS",
 116         34,             NOSYS,          NOP,    NULL,
 117         35,             NOSYS,          NOP,    NULL,
 118         SYNC,           NOP,            NOP,    "SYNC",
 119         KILL,           M1_I12,         NOP,    "KILL",
 120         RENAME,         M1_2NAMES,      NOP,    "RENAME",
 121         MKDIR,          M1_NAME1,       NOP,    "MKDIR",
 122         RMDIR,          M3_LOAD,        NOP,    "RMDIR",
 123         DUP,            NOP,            NOP,    "DUP",
 124         PIPE,           NOP,            M1_I12, "PIPE",
 125         TIMES,          M4_L5,          NOP,    "TIMES",
 126         44,             NOSYS,          NOP,    NULL,
 127         45,             NOSYS,          NOP,    NULL,
 128         SETGID,         M1_I1,          NOP,    "SETGID",
 129         GETGID,         NOP,            NOP,    "GETGID",
 130         SIGNAL,         NOP,            NOP,    "SIGNAL",
 131         49,             NOSYS,          NOP,    NULL,
 132         50,             NOSYS,          NOP,    NULL,
 133         51,             NOSYS,          NOP,    NULL,
 134         52,             NOSYS,          NOP,    NULL,
 135         53,             NOSYS,          NOP,    NULL,
 136         IOCTL,          M2_IOCTL,       M2_IOCTL,       "IOCTL",
 137         FCNTL,          M1_I12,         NOP,    "FCNTL",
 138 #if     ENABLE_SYMLINK
 139         RDLINK,         M1_NAME1,       NOP,    "RDLINK",
 140         SLINK,          M1_NAME1,       NOP,    "SLINK",
 141         LSTAT,          M1_NAME1,       NOP,    "LSTAT",
 142 #else
 143         56,             NOSYS,          NOP,    NULL,
 144         57,             NOSYS,          NOP,    NULL,
 145         58,             NOSYS,          NOP,    NULL,
 146 #endif
 147         EXEC,           M1_NAME1,       NOP,    "EXEC",
 148         UMASK,          M1_I1,          NOP,    "UMASK",
 149         CHROOT,         M3_LOAD,        NOP,    "CHROOT",
 150         SETSID,         NOP,            NOP,    "SETSID",
 151         GETPGRP,        NOP,            NOP,    "GETPGRP",
 152         KSIG,           NOSYS,          NOP,    "KSIG",
 153         UNPAUSE,        NOSYS,          NOP,    "UNPAUSE",
 154         66,             NOSYS,          NOP,    NULL,
 155         REVIVE,         NOSYS,          NOP,    "REVIVE",
 156         TASK_REPLY,     NOSYS,          NOP,    "TASK_REPLY",
 157         69,             NOSYS,          NOP,    NULL,
 158         70,             NOSYS,          NOP,    NULL,
 159         SIGACTION,      M1_SIGACTION,   NOP,    "SIGACTION",
 160         SIGSUSPEND,     M2_L1,          NOP,    "SIGSUSPEND",
 161         SIGPENDING,     NOP,            M2_L1,  "SIGPENDING",
 162         SIGPROCMASK,    M2_SIGPROC,     NOP,    "SIGPROCMASK",
 163         SIGRETURN,      M2_SIGRETURN,   NOP,    "SIGRETURN",
 164         REBOOT,         M1_I1,          NOP,    "REBOOT"
 165 };
 166
 167 static void get_message(m,bx)
 168 message *m;
 169 unsigned bx;
 170 {
 171   unsigned addr;
 172   int i;
 173   long buffer[ MESS_SIZE/4 + 1 ];
 174
 175   addr = bx;
 176   for (i = 0; i< sizeof(buffer)/4; i++)
 177         buffer[i] = ptrace(T_GETDATA,curpid,
 178                 (long) (addr+i*4) ,0L);
 179
 180   memcpy(m,buffer,MESS_SIZE);
 181
 182 }
 183
 184 static void get_data(s, bx, cnt)
 185 char *s;
 186 unsigned bx;
 187 int cnt;
 188 {
 189   unsigned addr;
 190   int i,nl;
 191   long buffer[PATH_MAX/4 + 1];
 192
 193   addr = bx;
 194   nl = (cnt / 4) + 1;
 195   for (i = 0; i< nl; i++)
 196         buffer[i] = ptrace(T_GETDATA, curpid, (long) (addr+i*4) ,0L);
 197
 198   memcpy(s, buffer, cnt);
 199 }
 200
 201
 202 void decode_result()
 203 {
 204
 205    /* Update message */
 206    get_message(&recv,saved_addr);
 207    Printf("result=%d\n", recv.m_type);
 208
 209    if (last_call < 0 || last_call >NCALLS) {
 210         Printf("Bad call in decode_result\n");
 211         return;
 212    }
 213
 214    switch (decode[last_call].rflag) {
 215    case NOP:
 216                 return;
 217                 break;
 218    case M1_I12:
 219                 Printf("m1_l1=%d m1_i2=%d ",recv.m1_i1,recv.m1_i2);
 220                 break;
 221    case M2_IOCTL:
 222                 decode_ioctl('R',&recv);
 223                 break;
 224    case M2_P1:
 225                 Printf("m2_p1=%lx ",(unsigned long)recv.m2_p1);
 226                 break;
 227    case M2_L1:
 228                 Printf("m2_l1=%lx ",recv.m2_l1);
 229                 break;
 230    case M2_I1:
 231                 Printf("m2_i1=%x ",recv.m2_i1);
 232                 break;
 233    default:
 234                 Printf("rflag=%d ",decode[last_call].rflag);
 235                 break;
 236    }
 237    Printf("\n");
 238 }
 239
 240
 241 void decode_message(bx)
 242 unsigned bx;
 243 {
 244 int t;
 245 int slen;
 246 unsigned int flag;
 247 char path[PATH_MAX];
 248
 249    /* Save address of message */
 250    saved_addr = bx;
 251    get_message(&sent,bx);
 252
 253    t = sent.m_type;
 254
 255    if ( t <= 0 || t >= NCALLS ) {
 256         Printf("Bad call - not in range\n");
 257         last_call = 0;
 258         return;
 259    }
 260
 261    flag = decode[t].sflag;
 262
 263    if ( flag == NOSYS) {
 264         Printf("Bad call - not in system\n");
 265         last_call = 0;
 266         return;
 267    }
 268    else
 269         last_call = t;
 270
 271    Printf(" type %s (%d) ", decode[last_call].name, last_call);
 272
 273    switch (flag) {
 274    case NOP:
 275                 break;
 276    case M1_I1:
 277    case M1_I12:
 278                 Printf("i1=%d ",sent.m1_i1);
 279                 if ( flag == M1_I1) break;
 280    case M1_I2:
 281                 Printf("i2=%d ",sent.m1_i2);
 282                 break;
 283    case M1_P1:
 284                 Printf("p1=%lx ",(unsigned long)sent.m1_p1);
 285                 break;
 286    case M1_NAME1:
 287    case M1_2NAMES:
 288                 slen = sent.m1_i1;
 289                 get_data(path, (unsigned long) sent.m1_p1, slen);
 290                 path[slen] = '\0';
 291                 Printf("s1=%s ",path);
 292                 if ( flag == M1_NAME1) break;
 293                 slen = sent.m1_i2;
 294                 get_data(path, (unsigned long) sent.m1_p2, slen);
 295                 path[slen] = '\0';
 296                 Printf("s2=%s ",path);
 297                 break;
 298    case M2_UTIME:
 299                 if ( sent.m2_i1 == 0 )
 300                         slen = sent.m2_i2;
 301                 else
 302                         slen = sent.m2_i1;
 303                 get_data(path, (unsigned long) sent.m2_p1, slen);
 304                 path[slen] = '\0';
 305                 Printf("p1=%s ",path);
 306                 if ( sent.m2_i1 != 0 )
 307                         Printf("l1=%lx l2=%lx ",sent.m2_l1,sent.m2_l2);
 308                 break;
 309    case M1_SIGACTION:
 310                 Printf("m1_i2=%d p1=%lx p2=%lx p3=%lx\n",
 311                         sent.m1_i2,
 312                         (unsigned long)sent.m1_p1,
 313                         (unsigned long)sent.m1_p2,
 314                         (unsigned long)sent.m1_p3);
 315                 break;
 316    case M2_4P:  Printf("m2_i1=%d m2_i2=%d m2_l1=%lx m2_l2=%lx ",
 317                         sent.m2_i1,sent.m2_i2,sent.m2_l1,sent.m2_l2);
 318                 break;
 319    case M2_L1:
 320                 Printf("m2_l1=%ld ",sent.m2_l1);
 321                 break;
 322    case M2_IOCTL:
 323                 decode_ioctl('S',&sent);
 324                 break;
 325    case M2_SIGRETURN:
 326                 Printf("m2_i2=%d l1=%lx p1=%lx ",
 327                         sent.m2_i2,sent.m2_l1,
 328                         (unsigned long)sent.m1_p1);
 329                 break;
 330    case M2_SIGPROC:
 331                 Printf("m2_i1=%d l1=%lx ", sent.m2_i1,sent.m2_l1);
 332                 break;
 333    case M13_OPEN:
 334                 if (sent.m1_i2 & O_CREAT) {
 335                         slen = sent.m1_i1;
 336                         get_data(path, (unsigned long) sent.m1_p1, slen);
 337                         path[slen] = '\0';
 338                         Printf("s1=%s ",path);
 339                         break;
 340                 }
 341                 /* fall to M3_LOAD */
 342    case M3_LOAD:
 343                 slen = sent.m3_i1;
 344                 if ( slen <= M3_STRING)
 345                         strncpy(path,sent.m3_ca1,M3_STRING);
 346                 else
 347                         get_data(path, (unsigned long) sent.m3_ca1, slen);
 348                 path[slen] = '\0';
 349                 Printf("m3_name=%s ",path);
 350                 break;
 351    case M4_L5:
 352                 Printf("m4_l5=%ld ",sent.m4_l5);
 353                 break;
 354    default:     Printf("sflag=%d ",decode[last_call].sflag);
 355                 break;
 356    }
 357    Printf("\n");
 358 }
 359
 360 #endif /* SYSCALLS_SUPPORT */