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 <sys/mount.h>
  10 #include <sys/mman.h>
  11 #include <unistd.h>
  12 #include "qemu.h"
  13
  14 int do_strace=0;
  15
  16 struct syscallname {
  17     int nr;
  18     const char *name;
  19     const char *format;
  20     void (*call)(const struct syscallname *,
  21                  abi_long, abi_long, abi_long,
  22                  abi_long, abi_long, abi_long);
  23     void (*result)(const struct syscallname *, abi_long);
  24 };
  25
  26 #ifdef __GNUC__
  27 /*
  28  * It is possible that target doesn't have syscall that uses
  29  * following flags but we don't want the compiler to warn
  30  * us about them being unused.  Same applies to utility print
  31  * functions.  It is ok to keep them while not used.
  32  */
  33 #define UNUSED __attribute__ ((unused))
  34 #else
  35 #define UNUSED
  36 #endif
  37
  38 /*
  39  * Structure used to translate flag values into strings.  This is
  40  * similar that is in the actual strace tool.
  41  */
  42 struct flags {
  43     abi_long    f_value;  /* flag */
  44     const char  *f_string; /* stringified flag */
  45 };
  46
  47 /* common flags for all architectures */
  48 #define FLAG_GENERIC(name) { name, #name }
  49 /* target specific flags (syscall_defs.h has TARGET_<flag>) */
  50 #define FLAG_TARGET(name)  { TARGET_ ## name, #name }
  51 /* end of flags array */
  52 #define FLAG_END           { 0, NULL }
  53
  54 UNUSED static const char *get_comma(int);
  55 UNUSED static void print_pointer(abi_long, int);
  56 UNUSED static void print_flags(const struct flags *, abi_long, int);
  57 UNUSED static void print_at_dirfd(abi_long, int);
  58 UNUSED static void print_file_mode(abi_long, int);
  59 UNUSED static void print_open_flags(abi_long, int);
  60 UNUSED static void print_syscall_prologue(const struct syscallname *);
  61 UNUSED static void print_syscall_epilogue(const struct syscallname *);
  62 UNUSED static void print_string(abi_long, int);
  63 UNUSED static void print_raw_param(const char *, abi_long, int);
  64 UNUSED static void print_timeval(abi_ulong, int);
  65 UNUSED static void print_number(abi_long, int);
  66
  67 /*
  68  * Utility functions
  69  */
  70 static void
  71 print_ipc_cmd(int cmd)
  72 {
  73 #define output_cmd(val) \
  74 if( cmd == val ) { \
  75     gemu_log(#val); \
  76     return; \
  77 }
  78
  79     cmd &= 0xff;
  80
  81     /* General IPC commands */
  82     output_cmd( IPC_RMID );
  83     output_cmd( IPC_SET );
  84     output_cmd( IPC_STAT );
  85     output_cmd( IPC_INFO );
  86     /* msgctl() commands */
  87     #ifdef __USER_MISC
  88     output_cmd( MSG_STAT );
  89     output_cmd( MSG_INFO );
  90     #endif
  91     /* shmctl() commands */
  92     output_cmd( SHM_LOCK );
  93     output_cmd( SHM_UNLOCK );
  94     output_cmd( SHM_STAT );
  95     output_cmd( SHM_INFO );
  96     /* semctl() commands */
  97     output_cmd( GETPID );
  98     output_cmd( GETVAL );
  99     output_cmd( GETALL );
 100     output_cmd( GETNCNT );
 101     output_cmd( GETZCNT );
 102     output_cmd( SETVAL );
 103     output_cmd( SETALL );
 104     output_cmd( SEM_STAT );
 105     output_cmd( SEM_INFO );
 106     output_cmd( IPC_RMID );
 107     output_cmd( IPC_RMID );
 108     output_cmd( IPC_RMID );
 109     output_cmd( IPC_RMID );
 110     output_cmd( IPC_RMID );
 111     output_cmd( IPC_RMID );
 112     output_cmd( IPC_RMID );
 113     output_cmd( IPC_RMID );
 114     output_cmd( IPC_RMID );
 115
 116     /* Some value we don't recognize */
 117     gemu_log("%d",cmd);
 118 }
 119
 120 #ifdef TARGET_NR__newselect
 121 static void
 122 print_fdset(int n, abi_ulong target_fds_addr)
 123 {
 124     int i;
 125
 126     gemu_log("[");
 127     if( target_fds_addr ) {
 128         abi_long *target_fds;
 129
 130         target_fds = lock_user(VERIFY_READ,
 131                                target_fds_addr,
 132                                sizeof(*target_fds)*(n / TARGET_ABI_BITS + 1),
 133                                1);
 134
 135         if (!target_fds)
 136             return;
 137
 138         for (i=n; i>=0; i--) {
 139             if ((tswapl(target_fds[i / TARGET_ABI_BITS]) >> (i & (TARGET_ABI_BITS - 1))) & 1)
 140                 gemu_log("%d,", i );
 141             }
 142         unlock_user(target_fds, target_fds_addr, 0);
 143     }
 144     gemu_log("]");
 145 }
 146 #endif
 147
 148 /*
 149  * Sysycall specific output functions
 150  */
 151
 152 /* select */
 153 #ifdef TARGET_NR__newselect
 154 static long newselect_arg1 = 0;
 155 static long newselect_arg2 = 0;
 156 static long newselect_arg3 = 0;
 157 static long newselect_arg4 = 0;
 158 static long newselect_arg5 = 0;
 159
 160 static void
 161 print_newselect(const struct syscallname *name,
 162                 abi_long arg1, abi_long arg2, abi_long arg3,
 163                 abi_long arg4, abi_long arg5, abi_long arg6)
 164 {
 165     gemu_log("%s(" TARGET_ABI_FMT_ld ",", name->name, arg1);
 166     print_fdset(arg1, arg2);
 167     gemu_log(",");
 168     print_fdset(arg1, arg3);
 169     gemu_log(",");
 170     print_fdset(arg1, arg4);
 171     gemu_log(",");
 172     print_timeval(arg5, 1);
 173     gemu_log(")");
 174
 175     /* save for use in the return output function below */
 176     newselect_arg1=arg1;
 177     newselect_arg2=arg2;
 178     newselect_arg3=arg3;
 179     newselect_arg4=arg4;
 180     newselect_arg5=arg5;
 181 }
 182 #endif
 183
 184 #ifdef TARGET_NR_semctl
 185 static void
 186 print_semctl(const struct syscallname *name,
 187              abi_long arg1, abi_long arg2, abi_long arg3,
 188              abi_long arg4, abi_long arg5, abi_long arg6)
 189 {
 190     gemu_log("%s(" TARGET_ABI_FMT_ld "," TARGET_ABI_FMT_ld ",", name->name, arg1, arg2);
 191     print_ipc_cmd(arg3);
 192     gemu_log(",0x" TARGET_ABI_FMT_lx ")", arg4);
 193 }
 194 #endif
 195
 196 static void
 197 print_execve(const struct syscallname *name,
 198              abi_long arg1, abi_long arg2, abi_long arg3,
 199              abi_long arg4, abi_long arg5, abi_long arg6)
 200 {
 201     abi_ulong arg_ptr_addr;
 202     char *s;
 203
 204     if (!(s = lock_user_string(arg1)))
 205         return;
 206     gemu_log("%s(\"%s\",{", name->name, s);
 207     unlock_user(s, arg1, 0);
 208
 209     for (arg_ptr_addr = arg2; ; arg_ptr_addr += sizeof(abi_ulong)) {
 210         abi_ulong *arg_ptr, arg_addr;
 211
 212         arg_ptr = lock_user(VERIFY_READ, arg_ptr_addr, sizeof(abi_ulong), 1);
 213         if (!arg_ptr)
 214             return;
 215         arg_addr = tswapl(*arg_ptr);
 216         unlock_user(arg_ptr, arg_ptr_addr, 0);
 217         if (!arg_addr)
 218             break;
 219         if ((s = lock_user_string(arg_addr))) {
 220             gemu_log("\"%s\",", s);
 221             unlock_user(s, arg_addr, 0);
 222         }
 223     }
 224
 225     gemu_log("NULL})");
 226 }
 227
 228 #ifdef TARGET_NR_ipc
 229 static void
 230 print_ipc(const struct syscallname *name,
 231           abi_long arg1, abi_long arg2, abi_long arg3,
 232           abi_long arg4, abi_long arg5, abi_long arg6)
 233 {
 234     switch(arg1) {
 235     case IPCOP_semctl:
 236         gemu_log("semctl(" TARGET_ABI_FMT_ld "," TARGET_ABI_FMT_ld ",", arg1, arg2);
 237         print_ipc_cmd(arg3);
 238         gemu_log(",0x" TARGET_ABI_FMT_lx ")", arg4);
 239         break;
 240     default:
 241         gemu_log("%s(" TARGET_ABI_FMT_ld "," TARGET_ABI_FMT_ld "," TARGET_ABI_FMT_ld "," TARGET_ABI_FMT_ld ")",
 242                  name->name, arg1, arg2, arg3, arg4);
 243     }
 244 }
 245 #endif
 246
 247 /*
 248  * Variants for the return value output function
 249  */
 250
 251 static void
 252 print_syscall_ret_addr(const struct syscallname *name, abi_long ret)
 253 {
 254 if( ret == -1 ) {
 255         gemu_log(" = -1 errno=%d (%s)\n", errno, target_strerror(errno));
 256     } else {
 257         gemu_log(" = 0x" TARGET_ABI_FMT_lx "\n", ret);
 258     }
 259 }
 260
 261 #if 0 /* currently unused */
 262 static void
 263 print_syscall_ret_raw(struct syscallname *name, abi_long ret)
 264 {
 265         gemu_log(" = 0x" TARGET_ABI_FMT_lx "\n", ret);
 266 }
 267 #endif
 268
 269 #ifdef TARGET_NR__newselect
 270 static void
 271 print_syscall_ret_newselect(const struct syscallname *name, abi_long ret)
 272 {
 273     gemu_log(" = 0x" TARGET_ABI_FMT_lx " (", ret);
 274     print_fdset(newselect_arg1,newselect_arg2);
 275     gemu_log(",");
 276     print_fdset(newselect_arg1,newselect_arg3);
 277     gemu_log(",");
 278     print_fdset(newselect_arg1,newselect_arg4);
 279     gemu_log(",");
 280     print_timeval(newselect_arg5, 1);
 281     gemu_log(")\n");
 282 }
 283 #endif
 284
 285 UNUSED static struct flags access_flags[] = {
 286     FLAG_GENERIC(F_OK),
 287     FLAG_GENERIC(R_OK),
 288     FLAG_GENERIC(W_OK),
 289     FLAG_GENERIC(X_OK),
 290     FLAG_END,
 291 };
 292
 293 UNUSED static struct flags at_file_flags[] = {
 294 #ifdef AT_EACCESS
 295     FLAG_GENERIC(AT_EACCESS),
 296 #endif
 297 #ifdef AT_SYMLINK_NOFOLLOW
 298     FLAG_GENERIC(AT_SYMLINK_NOFOLLOW),
 299 #endif
 300     FLAG_END,
 301 };
 302
 303 UNUSED static struct flags unlinkat_flags[] = {
 304 #ifdef AT_REMOVEDIR
 305     FLAG_GENERIC(AT_REMOVEDIR),
 306 #endif
 307     FLAG_END,
 308 };
 309
 310 UNUSED static struct flags mode_flags[] = {
 311     FLAG_GENERIC(S_IFSOCK),
 312     FLAG_GENERIC(S_IFLNK),
 313     FLAG_GENERIC(S_IFREG),
 314     FLAG_GENERIC(S_IFBLK),
 315     FLAG_GENERIC(S_IFDIR),
 316     FLAG_GENERIC(S_IFCHR),
 317     FLAG_GENERIC(S_IFIFO),
 318     FLAG_END,
 319 };
 320
 321 UNUSED static struct flags open_access_flags[] = {
 322     FLAG_TARGET(O_RDONLY),
 323     FLAG_TARGET(O_WRONLY),
 324     FLAG_TARGET(O_RDWR),
 325     FLAG_END,
 326 };
 327
 328 UNUSED static struct flags open_flags[] = {
 329     FLAG_TARGET(O_APPEND),
 330     FLAG_TARGET(O_CREAT),
 331     FLAG_TARGET(O_DIRECTORY),
 332     FLAG_TARGET(O_EXCL),
 333     FLAG_TARGET(O_LARGEFILE),
 334     FLAG_TARGET(O_NOCTTY),
 335     FLAG_TARGET(O_NOFOLLOW),
 336     FLAG_TARGET(O_NONBLOCK),      /* also O_NDELAY */
 337     FLAG_TARGET(O_SYNC),
 338     FLAG_TARGET(O_TRUNC),
 339 #ifdef O_DIRECT
 340     FLAG_TARGET(O_DIRECT),
 341 #endif
 342     FLAG_END,
 343 };
 344
 345 UNUSED static struct flags mount_flags[] = {
 346 #ifdef MS_BIND
 347     FLAG_GENERIC(MS_BIND),
 348 #endif
 349 #ifdef MS_DIRSYNC
 350     FLAG_GENERIC(MS_DIRSYNC),
 351 #endif
 352     FLAG_GENERIC(MS_MANDLOCK),
 353 #ifdef MS_MOVE
 354     FLAG_GENERIC(MS_MOVE),
 355 #endif
 356     FLAG_GENERIC(MS_NOATIME),
 357     FLAG_GENERIC(MS_NODEV),
 358     FLAG_GENERIC(MS_NODIRATIME),
 359     FLAG_GENERIC(MS_NOEXEC),
 360     FLAG_GENERIC(MS_NOSUID),
 361     FLAG_GENERIC(MS_RDONLY),
 362 #ifdef MS_RELATIME
 363     FLAG_GENERIC(MS_RELATIME),
 364 #endif
 365     FLAG_GENERIC(MS_REMOUNT),
 366     FLAG_GENERIC(MS_SYNCHRONOUS),
 367     FLAG_END,
 368 };
 369
 370 UNUSED static struct flags umount2_flags[] = {
 371 #ifdef MNT_FORCE
 372     FLAG_GENERIC(MNT_FORCE),
 373 #endif
 374 #ifdef MNT_DETACH
 375     FLAG_GENERIC(MNT_DETACH),
 376 #endif
 377 #ifdef MNT_EXPIRE
 378     FLAG_GENERIC(MNT_EXPIRE),
 379 #endif
 380     FLAG_END,
 381 };
 382
 383 UNUSED static struct flags mmap_prot_flags[] = {
 384     FLAG_GENERIC(PROT_NONE),
 385     FLAG_GENERIC(PROT_EXEC),
 386     FLAG_GENERIC(PROT_READ),
 387     FLAG_GENERIC(PROT_WRITE),
 388     FLAG_TARGET(PROT_SEM),
 389     FLAG_GENERIC(PROT_GROWSDOWN),
 390     FLAG_GENERIC(PROT_GROWSUP),
 391     FLAG_END,
 392 };
 393
 394 UNUSED static struct flags mmap_flags[] = {
 395     FLAG_TARGET(MAP_SHARED),
 396     FLAG_TARGET(MAP_PRIVATE),
 397     FLAG_TARGET(MAP_ANONYMOUS),
 398     FLAG_TARGET(MAP_DENYWRITE),
 399     FLAG_TARGET(MAP_FIXED),
 400     FLAG_TARGET(MAP_GROWSDOWN),
 401     FLAG_TARGET(MAP_EXECUTABLE),
 402 #ifdef MAP_LOCKED
 403     FLAG_TARGET(MAP_LOCKED),
 404 #endif
 405 #ifdef MAP_NONBLOCK
 406     FLAG_TARGET(MAP_NONBLOCK),
 407 #endif
 408     FLAG_TARGET(MAP_NORESERVE),
 409 #ifdef MAP_POPULATE
 410     FLAG_TARGET(MAP_POPULATE),
 411 #endif
 412 #ifdef TARGET_MAP_UNINITIALIZED
 413     FLAG_TARGET(MAP_UNINITIALIZED),
 414 #endif
 415     FLAG_END,
 416 };
 417
 418 UNUSED static struct flags fcntl_flags[] = {
 419     FLAG_TARGET(F_DUPFD),
 420     FLAG_TARGET(F_GETFD),
 421     FLAG_TARGET(F_SETFD),
 422     FLAG_TARGET(F_GETFL),
 423     FLAG_TARGET(F_SETFL),
 424     FLAG_TARGET(F_GETLK),
 425     FLAG_TARGET(F_SETLK),
 426     FLAG_TARGET(F_SETLKW),
 427     FLAG_END,
 428 };
 429
 430 /*
 431  * print_xxx utility functions.  These are used to print syscall
 432  * parameters in certain format.  All of these have parameter
 433  * named 'last'.  This parameter is used to add comma to output
 434  * when last == 0.
 435  */
 436
 437 static const char *
 438 get_comma(int last)
 439 {
 440     return ((last) ? "" : ",");
 441 }
 442
 443 static void
 444 print_flags(const struct flags *f, abi_long tflags, int last)
 445 {
 446     const char *sep = "";
 447     int flags;
 448     int n;
 449
 450     flags = (int)tswap32(tflags);
 451
 452     if ((flags == 0) && (f->f_value == 0)) {
 453         gemu_log("%s%s", f->f_string, get_comma(last));
 454         return;
 455     }
 456     for (n = 0; f->f_string != NULL; f++) {
 457         if ((f->f_value != 0) && ((flags & f->f_value) == f->f_value)) {
 458             gemu_log("%s%s", sep, f->f_string);
 459             flags &= ~f->f_value;
 460             sep = "|";
 461             n++;
 462         }
 463     }
 464
 465     if (n > 0) {
 466         /* print rest of the flags as numeric */
 467         if (flags != 0) {
 468             gemu_log("%s%#x%s", sep, flags, get_comma(last));
 469         } else {
 470             gemu_log("%s", get_comma(last));
 471         }
 472     } else {
 473         /* no string version of flags found, print them in hex then */
 474         gemu_log("%#x%s", flags, get_comma(last));
 475     }
 476 }
 477
 478 static void
 479 print_at_dirfd(abi_long tdirfd, int last)
 480 {
 481     int dirfd = tswap32(tdirfd);
 482
 483 #ifdef AT_FDCWD
 484     if (dirfd == AT_FDCWD) {
 485         gemu_log("AT_FDCWD%s", get_comma(last));
 486         return;
 487     }
 488 #endif
 489     gemu_log("%d%s", dirfd, get_comma(last));
 490 }
 491
 492 static void
 493 print_file_mode(abi_long tmode, int last)
 494 {
 495     const char *sep = "";
 496     const struct flags *m;
 497     mode_t mode = (mode_t)tswap32(tmode);
 498
 499     for (m = &mode_flags[0]; m->f_string != NULL; m++) {
 500         if ((m->f_value & mode) == m->f_value) {
 501             gemu_log("%s%s", m->f_string, sep);
 502             sep = "|";
 503             mode &= ~m->f_value;
 504             break;
 505         }
 506     }
 507
 508     mode &= ~S_IFMT;
 509     /* print rest of the mode as octal */
 510     if (mode != 0)
 511         gemu_log("%s%#o", sep, mode);
 512
 513     gemu_log("%s", get_comma(last));
 514 }
 515
 516 static void
 517 print_open_flags(abi_long tflags, int last)
 518 {
 519     int flags = tswap32(tflags);
 520
 521     print_flags(open_access_flags, flags & TARGET_O_ACCMODE, 1);
 522     flags &= ~TARGET_O_ACCMODE;
 523     if (flags == 0) {
 524         gemu_log("%s", get_comma(last));
 525         return;
 526     }
 527     gemu_log("|");
 528     print_flags(open_flags, flags, last);
 529 }
 530
 531 static void
 532 print_syscall_prologue(const struct syscallname *sc)
 533 {
 534     gemu_log("%s(", sc->name);
 535 }
 536
 537 /*ARGSUSED*/
 538 static void
 539 print_syscall_epilogue(const struct syscallname *sc)
 540 {
 541     (void)sc;
 542     gemu_log(")");
 543 }
 544
 545 static void
 546 print_string(abi_long addr, int last)
 547 {
 548     char *s;
 549
 550     if ((s = lock_user_string(addr)) != NULL) {
 551         gemu_log("\"%s\"%s", s, get_comma(last));
 552         unlock_user(s, addr, 0);
 553     } else {
 554         /* can't get string out of it, so print it as pointer */
 555         print_pointer(addr, last);
 556     }
 557 }
 558
 559 /*
 560  * Prints out raw parameter using given format.  Caller needs
 561  * to do byte swapping if needed.
 562  */
 563 static void
 564 print_raw_param(const char *fmt, abi_long param, int last)
 565 {
 566     char format[64];
 567
 568     (void) snprintf(format, sizeof (format), "%s%s", fmt, get_comma(last));
 569     gemu_log(format, param);
 570 }
 571
 572 static void
 573 print_pointer(abi_long p, int last)
 574 {
 575     if (p == 0)
 576         gemu_log("NULL%s", get_comma(last));
 577     else
 578         gemu_log("0x" TARGET_ABI_FMT_lx "%s", p, get_comma(last));
 579 }
 580
 581 /*
 582  * Reads 32-bit (int) number from guest address space from
 583  * address 'addr' and prints it.
 584  */
 585 static void
 586 print_number(abi_long addr, int last)
 587 {
 588     if (addr == 0) {
 589         gemu_log("NULL%s", get_comma(last));
 590     } else {
 591         int num;
 592
 593         get_user_s32(num, addr);
 594         gemu_log("[%d]%s", num, get_comma(last));
 595     }
 596 }
 597
 598 static void
 599 print_timeval(abi_ulong tv_addr, int last)
 600 {
 601     if( tv_addr ) {
 602         struct target_timeval *tv;
 603
 604         tv = lock_user(VERIFY_READ, tv_addr, sizeof(*tv), 1);
 605         if (!tv)
 606             return;
 607         gemu_log("{" TARGET_ABI_FMT_ld "," TARGET_ABI_FMT_ld "}%s",
 608             tv->tv_sec, tv->tv_usec, get_comma(last));
 609         unlock_user(tv, tv_addr, 0);
 610     } else
 611         gemu_log("NULL%s", get_comma(last));
 612 }
 613
 614 #undef UNUSED
 615
 616 #ifdef TARGET_NR_accept
 617 static void
 618 print_accept(const struct syscallname *name,
 619     abi_long arg0, abi_long arg1, abi_long arg2,
 620     abi_long arg3, abi_long arg4, abi_long arg5)
 621 {
 622     print_syscall_prologue(name);
 623     print_raw_param("%d", tswap32(arg0), 0);
 624     print_pointer(arg1, 0);
 625     print_number(arg2, 1);
 626     print_syscall_epilogue(name);
 627 }
 628 #endif
 629
 630 #ifdef TARGET_NR_access
 631 static void
 632 print_access(const struct syscallname *name,
 633     abi_long arg0, abi_long arg1, abi_long arg2,
 634     abi_long arg3, abi_long arg4, abi_long arg5)
 635 {
 636     print_syscall_prologue(name);
 637     print_string(arg0, 0);
 638     print_flags(access_flags, arg1, 1);
 639     print_syscall_epilogue(name);
 640 }
 641 #endif
 642
 643 #ifdef TARGET_NR_brk
 644 static void
 645 print_brk(const struct syscallname *name,
 646     abi_long arg0, abi_long arg1, abi_long arg2,
 647     abi_long arg3, abi_long arg4, abi_long arg5)
 648 {
 649     print_syscall_prologue(name);
 650     print_pointer(arg0, 1);
 651     print_syscall_epilogue(name);
 652 }
 653 #endif
 654
 655 #ifdef TARGET_NR_chdir
 656 static void
 657 print_chdir(const struct syscallname *name,
 658     abi_long arg0, abi_long arg1, abi_long arg2,
 659     abi_long arg3, abi_long arg4, abi_long arg5)
 660 {
 661     print_syscall_prologue(name);
 662     print_string(arg0, 1);
 663     print_syscall_epilogue(name);
 664 }
 665 #endif
 666
 667 #ifdef TARGET_NR_chmod
 668 static void
 669 print_chmod(const struct syscallname *name,
 670     abi_long arg0, abi_long arg1, abi_long arg2,
 671     abi_long arg3, abi_long arg4, abi_long arg5)
 672 {
 673     print_syscall_prologue(name);
 674     print_string(arg0, 0);
 675     print_file_mode(arg1, 1);
 676     print_syscall_epilogue(name);
 677 }
 678 #endif
 679
 680 #ifdef TARGET_NR_creat
 681 static void
 682 print_creat(const struct syscallname *name,
 683     abi_long arg0, abi_long arg1, abi_long arg2,
 684     abi_long arg3, abi_long arg4, abi_long arg5)
 685 {
 686     print_syscall_prologue(name);
 687     print_string(arg0, 0);
 688     print_file_mode(arg1, 1);
 689     print_syscall_epilogue(name);
 690 }
 691 #endif
 692
 693 #ifdef TARGET_NR_execv
 694 static void
 695 print_execv(const struct syscallname *name,
 696     abi_long arg0, abi_long arg1, abi_long arg2,
 697     abi_long arg3, abi_long arg4, abi_long arg5)
 698 {
 699     print_syscall_prologue(name);
 700     print_string(arg0, 0);
 701     print_raw_param("0x" TARGET_ABI_FMT_lx, tswapl(arg1), 1);
 702     print_syscall_epilogue(name);
 703 }
 704 #endif
 705
 706 #ifdef TARGET_NR_faccessat
 707 static void
 708 print_faccessat(const struct syscallname *name,
 709     abi_long arg0, abi_long arg1, abi_long arg2,
 710     abi_long arg3, abi_long arg4, abi_long arg5)
 711 {
 712     print_syscall_prologue(name);
 713     print_at_dirfd(arg0, 0);
 714     print_string(arg1, 0);
 715     print_flags(access_flags, arg2, 0);
 716     print_flags(at_file_flags, arg3, 1);
 717     print_syscall_epilogue(name);
 718 }
 719 #endif
 720
 721 #ifdef TARGET_NR_fchmodat
 722 static void
 723 print_fchmodat(const struct syscallname *name,
 724     abi_long arg0, abi_long arg1, abi_long arg2,
 725     abi_long arg3, abi_long arg4, abi_long arg5)
 726 {
 727     print_syscall_prologue(name);
 728     print_at_dirfd(arg0, 0);
 729     print_string(arg1, 0);
 730     print_file_mode(arg2, 0);
 731     print_flags(at_file_flags, arg3, 1);
 732     print_syscall_epilogue(name);
 733 }
 734 #endif
 735
 736 #ifdef TARGET_NR_fchownat
 737 static void
 738 print_fchownat(const struct syscallname *name,
 739     abi_long arg0, abi_long arg1, abi_long arg2,
 740     abi_long arg3, abi_long arg4, abi_long arg5)
 741 {
 742     print_syscall_prologue(name);
 743     print_at_dirfd(arg0, 0);
 744     print_string(arg1, 0);
 745 #ifdef USE_UID16
 746     print_raw_param("%d", tswap16(arg2), 0);
 747     print_raw_param("%d", tswap16(arg3), 0);
 748 #else
 749     print_raw_param("%d", tswap32(arg2), 0);
 750     print_raw_param("%d", tswap32(arg3), 0);
 751 #endif
 752     print_flags(at_file_flags, arg4, 1);
 753     print_syscall_epilogue(name);
 754 }
 755 #endif
 756
 757 #if defined(TARGET_NR_fcntl) || defined(TARGET_NR_fcntl64)
 758 static void
 759 print_fcntl(const struct syscallname *name,
 760     abi_long arg0, abi_long arg1, abi_long arg2,
 761     abi_long arg3, abi_long arg4, abi_long arg5)
 762 {
 763     print_syscall_prologue(name);
 764     print_raw_param("%d", tswap32(arg0), 0);
 765     print_flags(fcntl_flags, arg1, 0);
 766     /*
 767      * TODO: check flags and print following argument only
 768      *       when needed.
 769      */
 770     print_pointer(arg2, 1);
 771     print_syscall_epilogue(name);
 772 }
 773 #define print_fcntl64   print_fcntl
 774 #endif
 775
 776
 777 #ifdef TARGET_NR_futimesat
 778 static void
 779 print_futimesat(const struct syscallname *name,
 780     abi_long arg0, abi_long arg1, abi_long arg2,
 781     abi_long arg3, abi_long arg4, abi_long arg5)
 782 {
 783     print_syscall_prologue(name);
 784     print_at_dirfd(arg0, 0);
 785     print_string(arg1, 0);
 786     print_timeval(arg2, 0);
 787     print_timeval(arg2 + sizeof (struct target_timeval), 1);
 788     print_syscall_epilogue(name);
 789 }
 790 #endif
 791
 792 #ifdef TARGET_NR_link
 793 static void
 794 print_link(const struct syscallname *name,
 795     abi_long arg0, abi_long arg1, abi_long arg2,
 796     abi_long arg3, abi_long arg4, abi_long arg5)
 797 {
 798     print_syscall_prologue(name);
 799     print_string(arg0, 0);
 800     print_string(arg1, 1);
 801     print_syscall_epilogue(name);
 802 }
 803 #endif
 804
 805 #ifdef TARGET_NR_linkat
 806 static void
 807 print_linkat(const struct syscallname *name,
 808     abi_long arg0, abi_long arg1, abi_long arg2,
 809     abi_long arg3, abi_long arg4, abi_long arg5)
 810 {
 811     print_syscall_prologue(name);
 812     print_at_dirfd(arg0, 0);
 813     print_string(arg1, 0);
 814     print_at_dirfd(arg2, 0);
 815     print_string(arg3, 0);
 816     print_flags(at_file_flags, arg4, 1);
 817     print_syscall_epilogue(name);
 818 }
 819 #endif
 820
 821 #if defined(TARGET_NR_stat) || defined(TARGET_NR_stat64) || \
 822     defined(TARGET_NR_lstat) || defined(TARGET_NR_lstat64)
 823 static void
 824 print_stat(const struct syscallname *name,
 825     abi_long arg0, abi_long arg1, abi_long arg2,
 826     abi_long arg3, abi_long arg4, abi_long arg5)
 827 {
 828     print_syscall_prologue(name);
 829     print_string(arg0, 0);
 830     print_pointer(arg1, 1);
 831     print_syscall_epilogue(name);
 832 }
 833 #define print_lstat     print_stat
 834 #define print_stat64    print_stat
 835 #define print_lstat64   print_stat
 836 #endif
 837
 838 #if defined(TARGET_NR_fstat) || defined(TARGET_NR_fstat64)
 839 static void
 840 print_fstat(const struct syscallname *name,
 841     abi_long arg0, abi_long arg1, abi_long arg2,
 842     abi_long arg3, abi_long arg4, abi_long arg5)
 843 {
 844     print_syscall_prologue(name);
 845     print_raw_param("%d", tswap32(arg0), 0);
 846     print_pointer(arg1, 1);
 847     print_syscall_epilogue(name);
 848 }
 849 #define print_fstat64     print_fstat
 850 #endif
 851
 852 #ifdef TARGET_NR_mkdir
 853 static void
 854 print_mkdir(const struct syscallname *name,
 855     abi_long arg0, abi_long arg1, abi_long arg2,
 856     abi_long arg3, abi_long arg4, abi_long arg5)
 857 {
 858     print_syscall_prologue(name);
 859     print_string(arg0, 0);
 860     print_file_mode(arg1, 1);
 861     print_syscall_epilogue(name);
 862 }
 863 #endif
 864
 865 #ifdef TARGET_NR_mkdirat
 866 static void
 867 print_mkdirat(const struct syscallname *name,
 868     abi_long arg0, abi_long arg1, abi_long arg2,
 869     abi_long arg3, abi_long arg4, abi_long arg5)
 870 {
 871     print_syscall_prologue(name);
 872     print_at_dirfd(arg0, 0);
 873     print_string(arg1, 0);
 874     print_file_mode(arg2, 1);
 875     print_syscall_epilogue(name);
 876 }
 877 #endif
 878
 879 #ifdef TARGET_NR_mknod
 880 static void
 881 print_mknod(const struct syscallname *name,
 882     abi_long arg0, abi_long arg1, abi_long arg2,
 883     abi_long arg3, abi_long arg4, abi_long arg5)
 884 {
 885     int hasdev = (tswapl(arg1) & (S_IFCHR|S_IFBLK));
 886
 887     print_syscall_prologue(name);
 888     print_string(arg0, 0);
 889     print_file_mode(arg1, (hasdev == 0));
 890     if (hasdev) {
 891         print_raw_param("makedev(%d", major(tswapl(arg2)), 0);
 892         print_raw_param("%d)", minor(tswapl(arg2)), 1);
 893     }
 894     print_syscall_epilogue(name);
 895 }
 896 #endif
 897
 898 #ifdef TARGET_NR_mknodat
 899 static void
 900 print_mknodat(const struct syscallname *name,
 901     abi_long arg0, abi_long arg1, abi_long arg2,
 902     abi_long arg3, abi_long arg4, abi_long arg5)
 903 {
 904     int hasdev = (tswapl(arg2) & (S_IFCHR|S_IFBLK));
 905
 906     print_syscall_prologue(name);
 907     print_at_dirfd(arg0, 0);
 908     print_string(arg1, 0);
 909     print_file_mode(arg2, (hasdev == 0));
 910     if (hasdev) {
 911         print_raw_param("makedev(%d", major(tswapl(arg3)), 0);
 912         print_raw_param("%d)", minor(tswapl(arg3)), 1);
 913     }
 914     print_syscall_epilogue(name);
 915 }
 916 #endif
 917
 918 #ifdef TARGET_NR_mq_open
 919 static void
 920 print_mq_open(const struct syscallname *name,
 921     abi_long arg0, abi_long arg1, abi_long arg2,
 922     abi_long arg3, abi_long arg4, abi_long arg5)
 923 {
 924     int is_creat = (tswapl(arg1) & TARGET_O_CREAT);
 925
 926     print_syscall_prologue(name);
 927     print_string(arg0, 0);
 928     print_open_flags(arg1, (is_creat == 0));
 929     if (is_creat) {
 930         print_file_mode(arg2, 0);
 931         print_pointer(arg3, 1);
 932     }
 933     print_syscall_epilogue(name);
 934 }
 935 #endif
 936
 937 #ifdef TARGET_NR_open
 938 static void
 939 print_open(const struct syscallname *name,
 940     abi_long arg0, abi_long arg1, abi_long arg2,
 941     abi_long arg3, abi_long arg4, abi_long arg5)
 942 {
 943     int is_creat = (tswap32(arg1) & TARGET_O_CREAT);
 944
 945     print_syscall_prologue(name);
 946     print_string(arg0, 0);
 947     print_open_flags(arg1, (is_creat == 0));
 948     if (is_creat)
 949         print_file_mode(arg2, 1);
 950     print_syscall_epilogue(name);
 951 }
 952 #endif
 953
 954 #ifdef TARGET_NR_openat
 955 static void
 956 print_openat(const struct syscallname *name,
 957     abi_long arg0, abi_long arg1, abi_long arg2,
 958     abi_long arg3, abi_long arg4, abi_long arg5)
 959 {
 960     int is_creat = (tswap32(arg2) & TARGET_O_CREAT);
 961
 962     print_syscall_prologue(name);
 963     print_at_dirfd(arg0, 0);
 964     print_string(arg1, 0);
 965     print_open_flags(arg2, (is_creat == 0));
 966     if (is_creat)
 967         print_file_mode(arg3, 1);
 968     print_syscall_epilogue(name);
 969 }
 970 #endif
 971
 972 #ifdef TARGET_NR_mq_unlink
 973 static void
 974 print_mq_unlink(const struct syscallname *name,
 975     abi_long arg0, abi_long arg1, abi_long arg2,
 976     abi_long arg3, abi_long arg4, abi_long arg5)
 977 {
 978     print_syscall_prologue(name);
 979     print_string(arg0, 1);
 980     print_syscall_epilogue(name);
 981 }
 982 #endif
 983
 984 #if defined(TARGET_NR_fstatat64) || defined(TARGET_NR_newfstatat)
 985 static void
 986 print_fstatat64(const struct syscallname *name,
 987     abi_long arg0, abi_long arg1, abi_long arg2,
 988     abi_long arg3, abi_long arg4, abi_long arg5)
 989 {
 990     print_syscall_prologue(name);
 991     print_at_dirfd(arg0, 0);
 992     print_string(arg1, 0);
 993     print_pointer(arg2, 0);
 994     print_flags(at_file_flags, arg3, 1);
 995     print_syscall_epilogue(name);
 996 }
 997 #define print_newfstatat    print_fstatat64
 998 #endif
 999
1000 #ifdef TARGET_NR_readlink
1001 static void
1002 print_readlink(const struct syscallname *name,
1003     abi_long arg0, abi_long arg1, abi_long arg2,
1004     abi_long arg3, abi_long arg4, abi_long arg5)
1005 {
1006     print_syscall_prologue(name);
1007     print_string(arg0, 0);
1008     print_pointer(arg1, 0);
1009     print_raw_param("%u", tswapl(arg2), 1);
1010     print_syscall_epilogue(name);
1011 }
1012 #endif
1013
1014 #ifdef TARGET_NR_readlinkat
1015 static void
1016 print_readlinkat(const struct syscallname *name,
1017     abi_long arg0, abi_long arg1, abi_long arg2,
1018     abi_long arg3, abi_long arg4, abi_long arg5)
1019 {
1020     print_syscall_prologue(name);
1021     print_at_dirfd(arg0, 0);
1022     print_string(arg1, 0);
1023     print_pointer(arg2, 0);
1024     print_raw_param("%u", tswapl(arg3), 1);
1025     print_syscall_epilogue(name);
1026 }
1027 #endif
1028
1029 #ifdef TARGET_NR_rename
1030 static void
1031 print_rename(const struct syscallname *name,
1032     abi_long arg0, abi_long arg1, abi_long arg2,
1033     abi_long arg3, abi_long arg4, abi_long arg5)
1034 {
1035     print_syscall_prologue(name);
1036     print_string(arg0, 0);
1037     print_string(arg1, 1);
1038     print_syscall_epilogue(name);
1039 }
1040 #endif
1041
1042 #ifdef TARGET_NR_renameat
1043 static void
1044 print_renameat(const struct syscallname *name,
1045     abi_long arg0, abi_long arg1, abi_long arg2,
1046     abi_long arg3, abi_long arg4, abi_long arg5)
1047 {
1048     print_syscall_prologue(name);
1049     print_at_dirfd(arg0, 0);
1050     print_string(arg1, 0);
1051     print_at_dirfd(arg2, 0);
1052     print_string(arg3, 1);
1053     print_syscall_epilogue(name);
1054 }
1055 #endif
1056
1057 #ifdef TARGET_NR_statfs
1058 static void
1059 print_statfs(const struct syscallname *name,
1060     abi_long arg0, abi_long arg1, abi_long arg2,
1061     abi_long arg3, abi_long arg4, abi_long arg5)
1062 {
1063     print_syscall_prologue(name);
1064     print_string(arg0, 0);
1065     print_pointer(arg1, 1);
1066     print_syscall_epilogue(name);
1067 }
1068 #define print_statfs64  print_statfs
1069 #endif
1070
1071 #ifdef TARGET_NR_symlink
1072 static void
1073 print_symlink(const struct syscallname *name,
1074     abi_long arg0, abi_long arg1, abi_long arg2,
1075     abi_long arg3, abi_long arg4, abi_long arg5)
1076 {
1077     print_syscall_prologue(name);
1078     print_string(arg0, 0);
1079     print_string(arg1, 1);
1080     print_syscall_epilogue(name);
1081 }
1082 #endif
1083
1084 #ifdef TARGET_NR_symlinkat
1085 static void
1086 print_symlinkat(const struct syscallname *name,
1087     abi_long arg0, abi_long arg1, abi_long arg2,
1088     abi_long arg3, abi_long arg4, abi_long arg5)
1089 {
1090     print_syscall_prologue(name);
1091     print_string(arg0, 0);
1092     print_at_dirfd(arg1, 0);
1093     print_string(arg2, 1);
1094     print_syscall_epilogue(name);
1095 }
1096 #endif
1097
1098 #ifdef TARGET_NR_mount
1099 static void
1100 print_mount(const struct syscallname *name,
1101     abi_long arg0, abi_long arg1, abi_long arg2,
1102     abi_long arg3, abi_long arg4, abi_long arg5)
1103 {
1104     print_syscall_prologue(name);
1105     print_string(arg0, 0);
1106     print_string(arg1, 0);
1107     print_string(arg2, 0);
1108     print_flags(mount_flags, arg3, 0);
1109     print_pointer(arg4, 1);
1110     print_syscall_epilogue(name);
1111 }
1112 #endif
1113
1114 #ifdef TARGET_NR_umount
1115 static void
1116 print_umount(const struct syscallname *name,
1117     abi_long arg0, abi_long arg1, abi_long arg2,
1118     abi_long arg3, abi_long arg4, abi_long arg5)
1119 {
1120     print_syscall_prologue(name);
1121     print_string(arg0, 1);
1122     print_syscall_epilogue(name);
1123 }
1124 #endif
1125
1126 #ifdef TARGET_NR_umount2
1127 static void
1128 print_umount2(const struct syscallname *name,
1129     abi_long arg0, abi_long arg1, abi_long arg2,
1130     abi_long arg3, abi_long arg4, abi_long arg5)
1131 {
1132     print_syscall_prologue(name);
1133     print_string(arg0, 0);
1134     print_flags(umount2_flags, arg1, 1);
1135     print_syscall_epilogue(name);
1136 }
1137 #endif
1138
1139 #ifdef TARGET_NR_unlink
1140 static void
1141 print_unlink(const struct syscallname *name,
1142     abi_long arg0, abi_long arg1, abi_long arg2,
1143     abi_long arg3, abi_long arg4, abi_long arg5)
1144 {
1145     print_syscall_prologue(name);
1146     print_string(arg0, 1);
1147     print_syscall_epilogue(name);
1148 }
1149 #endif
1150
1151 #ifdef TARGET_NR_unlinkat
1152 static void
1153 print_unlinkat(const struct syscallname *name,
1154     abi_long arg0, abi_long arg1, abi_long arg2,
1155     abi_long arg3, abi_long arg4, abi_long arg5)
1156 {
1157     print_syscall_prologue(name);
1158     print_at_dirfd(arg0, 0);
1159     print_string(arg1, 0);
1160     print_flags(unlinkat_flags, arg2, 1);
1161     print_syscall_epilogue(name);
1162 }
1163 #endif
1164
1165 #ifdef TARGET_NR_utime
1166 static void
1167 print_utime(const struct syscallname *name,
1168     abi_long arg0, abi_long arg1, abi_long arg2,
1169     abi_long arg3, abi_long arg4, abi_long arg5)
1170 {
1171     print_syscall_prologue(name);
1172     print_string(arg0, 0);
1173     print_pointer(arg1, 1);
1174     print_syscall_epilogue(name);
1175 }
1176 #endif
1177
1178 #ifdef TARGET_NR_utimes
1179 static void
1180 print_utimes(const struct syscallname *name,
1181     abi_long arg0, abi_long arg1, abi_long arg2,
1182     abi_long arg3, abi_long arg4, abi_long arg5)
1183 {
1184     print_syscall_prologue(name);
1185     print_string(arg0, 0);
1186     print_pointer(arg1, 1);
1187     print_syscall_epilogue(name);
1188 }
1189 #endif
1190
1191 #ifdef TARGET_NR_utimensat
1192 static void
1193 print_utimensat(const struct syscallname *name,
1194     abi_long arg0, abi_long arg1, abi_long arg2,
1195     abi_long arg3, abi_long arg4, abi_long arg5)
1196 {
1197     print_syscall_prologue(name);
1198     print_at_dirfd(arg0, 0);
1199     print_string(arg1, 0);
1200     print_pointer(arg2, 0);
1201     print_flags(at_file_flags, arg3, 1);
1202     print_syscall_epilogue(name);
1203 }
1204 #endif
1205
1206 #if defined(TARGET_NR_mmap) || defined(TARGET_NR_mmap2)
1207 static void
1208 print_mmap(const struct syscallname *name,
1209     abi_long arg0, abi_long arg1, abi_long arg2,
1210     abi_long arg3, abi_long arg4, abi_long arg5)
1211 {
1212     print_syscall_prologue(name);
1213     print_pointer(arg0, 0);
1214     print_raw_param("%d", tswapl(arg1), 0);
1215     print_flags(mmap_prot_flags, arg2, 0);
1216     print_flags(mmap_flags, arg3, 0);
1217     print_raw_param("%d", tswapl(arg4), 0);
1218     print_raw_param("%#x", tswapl(arg5), 1);
1219     print_syscall_epilogue(name);
1220 }
1221 #define print_mmap2     print_mmap
1222 #endif
1223
1224 #ifdef TARGET_NR_mprotect
1225 static void
1226 print_mprotect(const struct syscallname *name,
1227     abi_long arg0, abi_long arg1, abi_long arg2,
1228     abi_long arg3, abi_long arg4, abi_long arg5)
1229 {
1230     print_syscall_prologue(name);
1231     print_pointer(arg0, 0);
1232     print_raw_param("%d", tswapl(arg1), 0);
1233     print_flags(mmap_prot_flags, arg2, 1);
1234     print_syscall_epilogue(name);
1235 }
1236 #endif
1237
1238 #ifdef TARGET_NR_munmap
1239 static void
1240 print_munmap(const struct syscallname *name,
1241     abi_long arg0, abi_long arg1, abi_long arg2,
1242     abi_long arg3, abi_long arg4, abi_long arg5)
1243 {
1244     print_syscall_prologue(name);
1245     print_pointer(arg0, 0);
1246     print_raw_param("%d", tswapl(arg1), 1);
1247     print_syscall_epilogue(name);
1248 }
1249 #endif
1250
1251 #ifdef TARGET_NR_futex
1252 static void print_futex_op(abi_long tflag, int last)
1253 {
1254 #define print_op(val) \
1255 if( cmd == val ) { \
1256     gemu_log(#val); \
1257     return; \
1258 }
1259
1260     int cmd = (int)tswap32(tflag);
1261 #ifdef FUTEX_PRIVATE_FLAG
1262     if (cmd & FUTEX_PRIVATE_FLAG) {
1263         gemu_log("FUTEX_PRIVATE_FLAG|");
1264         cmd &= ~FUTEX_PRIVATE_FLAG;
1265     }
1266 #endif
1267     print_op(FUTEX_WAIT)
1268     print_op(FUTEX_WAKE)
1269     print_op(FUTEX_FD)
1270     print_op(FUTEX_REQUEUE)
1271     print_op(FUTEX_CMP_REQUEUE)
1272     print_op(FUTEX_WAKE_OP)
1273     print_op(FUTEX_LOCK_PI)
1274     print_op(FUTEX_UNLOCK_PI)
1275     print_op(FUTEX_TRYLOCK_PI)
1276 #ifdef FUTEX_WAIT_BITSET
1277     print_op(FUTEX_WAIT_BITSET)
1278 #endif
1279 #ifdef FUTEX_WAKE_BITSET
1280     print_op(FUTEX_WAKE_BITSET)
1281 #endif
1282     /* unknown values */
1283     gemu_log("%d",cmd);
1284 }
1285
1286 static void
1287 print_futex(const struct syscallname *name,
1288     abi_long arg0, abi_long arg1, abi_long arg2,
1289     abi_long arg3, abi_long arg4, abi_long arg5)
1290 {
1291     print_syscall_prologue(name);
1292     print_pointer(arg0, 0);
1293     print_futex_op(arg1, 0);
1294     print_raw_param(",%d", tswapl(arg2), 0);
1295     print_pointer(arg3, 0); /* struct timespec */
1296     print_pointer(arg4, 0);
1297     print_raw_param("%d", tswapl(arg4), 1);
1298     print_syscall_epilogue(name);
1299 }
1300 #endif
1301
1302 /*
1303  * An array of all of the syscalls we know about
1304  */
1305
1306 static const struct syscallname scnames[] = {
1307 #include "strace.list"
1308 };
1309
1310 static int nsyscalls = ARRAY_SIZE(scnames);
1311
1312 /*
1313  * The public interface to this module.
1314  */
1315 void
1316 print_syscall(int num,
1317               abi_long arg1, abi_long arg2, abi_long arg3,
1318               abi_long arg4, abi_long arg5, abi_long arg6)
1319 {
1320     int i;
1321     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 ")";
1322
1323     gemu_log("%d ", getpid() );
1324
1325     for(i=0;i<nsyscalls;i++)
1326         if( scnames[i].nr == num ) {
1327             if( scnames[i].call != NULL ) {
1328                 scnames[i].call(&scnames[i],arg1,arg2,arg3,arg4,arg5,arg6);
1329             } else {
1330                 /* XXX: this format system is broken because it uses
1331                    host types and host pointers for strings */
1332                 if( scnames[i].format != NULL )
1333                     format = scnames[i].format;
1334                 gemu_log(format,scnames[i].name, arg1,arg2,arg3,arg4,arg5,arg6);
1335             }
1336             return;
1337         }
1338     gemu_log("Unknown syscall %d\n", num);
1339 }
1340
1341
1342 void
1343 print_syscall_ret(int num, abi_long ret)
1344 {
1345     int i;
1346
1347     for(i=0;i<nsyscalls;i++)
1348         if( scnames[i].nr == num ) {
1349             if( scnames[i].result != NULL ) {
1350                 scnames[i].result(&scnames[i],ret);
1351             } else {
1352                 if( ret < 0 ) {
1353                     gemu_log(" = -1 errno=" TARGET_ABI_FMT_ld " (%s)\n", -ret, target_strerror(-ret));
1354                 } else {
1355                     gemu_log(" = " TARGET_ABI_FMT_ld "\n", ret);
1356                 }
1357             }
1358             break;
1359         }
1360 }