text: /*
   *  Darwin syscalls
   *
   *  Copyright (c) 2003 Fabrice Bellard
   *  Copyright (c) 2006 Pierre d'Herbemont
   *
   *  This program is free software; you can redistribute it and/or modify
   *  it under the terms of the GNU General Public License as published by
   *  the Free Software Foundation; either version 2 of the License, or
   *  (at your option) any later version.
   *
   *  This program is distributed in the hope that it will be useful,
   *  but WITHOUT ANY WARRANTY; without even the implied warranty of
   *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   *  GNU General Public License for more details.
   *
   *  You should have received a copy of the GNU General Public License
   *  along with this program; if not, see <http://www.gnu.org/licenses/>.
   */
  #include <fcntl.h>
  #include <stdio.h>
  #include <stdlib.h>
  #include <errno.h>
  
  #include <mach/host_info.h>
  #include <mach/mach.h>
  #include <mach/mach_time.h>
  #include <mach/message.h>
  
  #include <pthread.h>
  #include <dirent.h>
  
  #include <sys/stat.h>
  #include <sys/syscall.h>
  #include <sys/sysctl.h>
  #include <sys/types.h>
  #include <unistd.h>
  #include <sys/ioctl.h>
  #include <sys/mman.h>
  #include <sys/types.h>
  #include <sys/dirent.h>
  #include <sys/uio.h>
  #include <sys/termios.h>
  #include <sys/ptrace.h>
  #include <net/if.h>
  
  #include <sys/param.h>
  #include <sys/mount.h>
  
  #include <sys/attr.h>
  
  #include <mach/ndr.h>
  #include <mach/mig_errors.h>
  
  #include <sys/xattr.h>
  
  #include "qemu.h"
  
  //#define DEBUG_SYSCALL
  
  #ifdef DEBUG_SYSCALL
  # define DEBUG_FORCE_ENABLE_LOCAL() int __DEBUG_qemu_user_force_enable = 1
  # define DEBUG_BEGIN_ENABLE  __DEBUG_qemu_user_force_enable = 1;
  # define DEBUG_END_ENABLE  __DEBUG_qemu_user_force_enable = 0;
  
  # define DEBUG_DISABLE_ALL() static int __DEBUG_qemu_user_force_enable = 0
  # define DEBUG_ENABLE_ALL()  static int __DEBUG_qemu_user_force_enable = 1
      DEBUG_ENABLE_ALL();
  
  # define DPRINTF(...) do { qemu_log(__VA_ARGS__); \
                             if(__DEBUG_qemu_user_force_enable) fprintf(stderr, __VA_ARGS__); \
                           } while(0)
  #else
  # define DEBUG_FORCE_ENABLE_LOCAL()
  # define DEBUG_BEGIN_ENABLE
  # define DEBUG_END_ENABLE
  
  # define DPRINTF(...) do { qemu_log(__VA_ARGS__); } while(0)
  #endif
  
  enum {
      bswap_out = 0,
      bswap_in = 1
  };
  
  extern const char *interp_prefix;
  
  static inline long get_errno(long ret)
  {
      if (ret == -1)
          return -errno;
      else
          return ret;
  }
  
  static inline int is_error(long ret)
  {
      return (unsigned long)ret >= (unsigned long)(-4096);
  }
  
  /* ------------------------------------------------------------
     Mach syscall handling
  */
  
  void static inline print_description_msg_header(mach_msg_header_t *hdr)
  {
      char *name = NULL;
      int i;
      struct { int number; char *name; } msg_name[] =
      {
          /* see http://fxr.watson.org/fxr/source/compat/mach/mach_namemap.c?v=NETBSD */
          { 200,      "host_info" },
          { 202,      "host_page_size" },
          { 206,      "host_get_clock_service" },
          { 206,      "host_get_clock_service" },
          { 206,      "host_get_clock_service" },
          { 306,      "host_get_clock_service" },
          { 3204,     "mach_port_allocate" },
          { 3206,     "mach_port_deallocate" },
          { 3404,     "mach_ports_lookup" },
          { 3409,     "mach_task_get_special_port" },
          { 3414,     "mach_task_get_exception_ports" },
          { 3418,     "mach_semaphore_create" },
          { 3504,     "mach_semaphore_create" },
          { 3509,     "mach_semaphore_create" },
          { 3518,     "semaphore_create" },
          { 3616,     "thread_policy" },
          { 3801,     "vm_allocate" },
          { 3802,     "vm_deallocate" },
          { 3802,     "vm_deallocate" },
          { 3803,     "vm_protect" },
          { 3812,     "vm_map" },
          { 4241776,  "lu_message_send_id" },  /* lookupd */
          { 4241876,  "lu_message_reply_id" }, /* lookupd */
      };
  
      for(i = 0; i < ARRAY_SIZE(msg_name); i++) {
          if(msg_name[i].number == hdr->msgh_id)
          {
              name = msg_name[i].name;
              break;
          }
      }
      if(!name)
          DPRINTF("unknown mach msg %d 0x%x\n", hdr->msgh_id, hdr->msgh_id);
      else
          DPRINTF("%s\n", name);
  #if 0
      DPRINTF("Bits: %8x\n", hdr->msgh_bits);
      DPRINTF("Size: %8x\n", hdr->msgh_size);
      DPRINTF("Rmte: %8x\n", hdr->msgh_remote_port);
      DPRINTF("Locl: %8x\n", hdr->msgh_local_port);
      DPRINTF("Rsrv: %8x\n", hdr->msgh_reserved);
  
      DPRINTF("Id  : %8x\n", hdr->msgh_id);
  
      NDR_record_t *ndr = (NDR_record_t *)(hdr + 1);
      DPRINTF("hdr = %p, sizeof(hdr) = %x, NDR = %p\n", hdr, (unsigned int)sizeof(mach_msg_header_t), ndr);
      DPRINTF("%d %d %d %d %d %d %d %d\n",
             ndr->mig_vers, ndr->if_vers, ndr->reserved1, ndr->mig_encoding,
             ndr->int_rep, ndr->char_rep, ndr->float_rep, ndr->reserved2);
  #endif
  }
  
  static inline void print_mach_msg_return(mach_msg_return_t ret)
  {
      int i, found = 0;
  #define MACH_MSG_RET(msg) { msg, #msg }
      struct { int code; char *name; } msg_name[] =
      {
          /* ref: http://darwinsource.opendarwin.org/10.4.2/xnu-792.2.4/osfmk/man/mach_msg.html */
          /* send message */
          MACH_MSG_RET(MACH_SEND_MSG_TOO_SMALL),
          MACH_MSG_RET(MACH_SEND_NO_BUFFER),
          MACH_MSG_RET(MACH_SEND_INVALID_DATA),
          MACH_MSG_RET(MACH_SEND_INVALID_HEADER),
          MACH_MSG_RET(MACH_SEND_INVALID_DEST),
          MACH_MSG_RET(MACH_SEND_INVALID_NOTIFY),
          MACH_MSG_RET(MACH_SEND_INVALID_REPLY),
          MACH_MSG_RET(MACH_SEND_INVALID_TRAILER),
          MACH_MSG_RET(MACH_SEND_INVALID_MEMORY),
          MACH_MSG_RET(MACH_SEND_INVALID_RIGHT),
          MACH_MSG_RET(MACH_SEND_INVALID_TYPE),
          MACH_MSG_RET(MACH_SEND_INTERRUPTED),
          MACH_MSG_RET(MACH_SEND_TIMED_OUT),
  
          MACH_MSG_RET(MACH_RCV_BODY_ERROR),
          MACH_MSG_RET(MACH_RCV_HEADER_ERROR),
  
          MACH_MSG_RET(MACH_RCV_IN_SET),
          MACH_MSG_RET(MACH_RCV_INTERRUPTED),
  
          MACH_MSG_RET(MACH_RCV_INVALID_DATA),
          MACH_MSG_RET(MACH_RCV_INVALID_NAME),
          MACH_MSG_RET(MACH_RCV_INVALID_NOTIFY),
          MACH_MSG_RET(MACH_RCV_INVALID_TRAILER),
          MACH_MSG_RET(MACH_RCV_INVALID_TYPE),
  
          MACH_MSG_RET(MACH_RCV_PORT_CHANGED),
          MACH_MSG_RET(MACH_RCV_PORT_DIED),
  
          MACH_MSG_RET(MACH_RCV_SCATTER_SMALL),
          MACH_MSG_RET(MACH_RCV_TIMED_OUT),
          MACH_MSG_RET(MACH_RCV_TOO_LARGE)
      };
  #undef MACH_MSG_RET
  
      if( ret == MACH_MSG_SUCCESS)
          DPRINTF("MACH_MSG_SUCCESS\n");
      else
      {
          for( i = 0; i < ARRAY_SIZE(msg_name); i++) {
              if(msg_name[i].code == ret) {
                  DPRINTF("%s\n", msg_name[i].name);
                  found = 1;
                  break;
              }
          }
          if(!found)
              qerror("unknow mach message ret code %d\n", ret);
      }
  }
  
  static inline void swap_mach_msg_header(mach_msg_header_t *hdr)
  {
      hdr->msgh_bits = tswap32(hdr->msgh_bits);
      hdr->msgh_size = tswap32(hdr->msgh_size);
      hdr->msgh_remote_port = tswap32(hdr->msgh_remote_port);
      hdr->msgh_local_port = tswap32(hdr->msgh_local_port);
      hdr->msgh_reserved = tswap32(hdr->msgh_reserved);
      hdr->msgh_id = tswap32(hdr->msgh_id);
  }
  
  struct complex_msg {
              mach_msg_header_t hdr;
              mach_msg_body_t body;
  };
  
  static inline void swap_mach_msg_body(struct complex_msg *complex_msg, int bswap)
  {
      mach_msg_port_descriptor_t *descr = (mach_msg_port_descriptor_t *)(complex_msg+1);
      int i,j;
  
      if(bswap == bswap_in)
          tswap32s(&complex_msg->body.msgh_descriptor_count);
  
      DPRINTF("body.msgh_descriptor_count %d\n", complex_msg->body.msgh_descriptor_count);
  
      for(i = 0; i < complex_msg->body.msgh_descriptor_count; i++) {
          switch(descr->type)
          {
              case MACH_MSG_PORT_DESCRIPTOR:
                  tswap32s(&descr->name);
                  descr++;
                  break;
              case MACH_MSG_OOL_DESCRIPTOR:
              {
                  mach_msg_ool_descriptor_t *ool = (void *)descr;
                  tswap32s((uint32_t *)&ool->address);
                  tswap32s(&ool->size);
  
                  descr = (mach_msg_port_descriptor_t *)(ool+1);
                  break;
              }
              case MACH_MSG_OOL_PORTS_DESCRIPTOR:
              {
                  mach_msg_ool_ports_descriptor_t *ool_ports = (void *)descr;
                  mach_port_name_t * port_names;
  
                  if(bswap == bswap_in)
                  {
                      tswap32s((uint32_t *)&ool_ports->address);
                      tswap32s(&ool_ports->count);
                  }
  
                  port_names = ool_ports->address;
  
                  for(j = 0; j < ool_ports->count; j++)
                      tswap32s(&port_names[j]);
  
                  if(bswap == bswap_out)
                  {
                      tswap32s((uint32_t *)&ool_ports->address);
                      tswap32s(&ool_ports->count);
                  }
  
                  descr = (mach_msg_port_descriptor_t *)(ool_ports+1);
                  break;
              }
              default: qerror("unknow mach msg descriptor type %x\n", descr->type);
          }
      }
      if(bswap == bswap_out)
          tswap32s(&complex_msg->body.msgh_descriptor_count);
  }
  
  static inline void swap_mach_msg(mach_msg_header_t *hdr, int bswap)
  {
      if (bswap == bswap_out && hdr->msgh_bits & MACH_MSGH_BITS_COMPLEX)
          swap_mach_msg_body((struct complex_msg *)hdr, bswap);
  
      swap_mach_msg_header(hdr);
  
      if (bswap == bswap_in && hdr->msgh_bits & MACH_MSGH_BITS_COMPLEX)
          swap_mach_msg_body((struct complex_msg *)hdr, bswap);
  }
  
  static inline uint32_t target_mach_msg_trap(
          mach_msg_header_t *hdr, uint32_t options, uint32_t send_size,
          uint32_t rcv_size, uint32_t rcv_name, uint32_t time_out, uint32_t notify)
  {
      extern int mach_msg_trap(mach_msg_header_t *, mach_msg_option_t,
            mach_msg_size_t, mach_msg_size_t, mach_port_t,
            mach_msg_timeout_t, mach_port_t);
      mach_msg_audit_trailer_t *trailer;
      mach_msg_id_t msg_id;
      uint32_t ret = 0;
      int i;
  
      swap_mach_msg(hdr, bswap_in);
  
      msg_id = hdr->msgh_id;
  
      print_description_msg_header(hdr);
  
      ret = mach_msg_trap(hdr, options, send_size, rcv_size, rcv_name, time_out, notify);
  
      print_mach_msg_return(ret);
  
      if( (options & MACH_RCV_MSG) && (REQUESTED_TRAILER_SIZE(options) > 0) )
      {
          /* XXX: the kernel always return the full trailer with MACH_SEND_MSG, so we should
                  probably always bswap it  */
          /* warning: according to Mac OS X Internals (the book) msg_size might be expressed in
                      natural_t units but according to xnu/osfmk/mach/message.h: "The size of
                      the message must be specified in bytes" */
          trailer = (mach_msg_audit_trailer_t *)((uint8_t *)hdr + hdr->msgh_size);
          /* XXX: Should probably do that based on the option asked by the sender, but dealing
          with kernel answer seems more sound */
          switch(trailer->msgh_trailer_size)
          {
              case sizeof(mach_msg_audit_trailer_t):
                  for(i = 0; i < 8; i++)
                      tswap32s(&trailer->msgh_audit.val[i]);
                  /* Fall in mach_msg_security_trailer_t case */
              case sizeof(mach_msg_security_trailer_t):
                  tswap32s(&trailer->msgh_sender.val[0]);
                  tswap32s(&trailer->msgh_sender.val[1]);
                  /* Fall in mach_msg_seqno_trailer_t case */
              case sizeof(mach_msg_seqno_trailer_t):
                  tswap32s(&trailer->msgh_seqno);
                  /* Fall in mach_msg_trailer_t case */
              case sizeof(mach_msg_trailer_t):
                  tswap32s(&trailer->msgh_trailer_type);
                  tswap32s(&trailer->msgh_trailer_size);
                  break;
              case 0:
                  /* Safer not to byteswap, but probably wrong */
                  break;
              default:
                  qerror("unknow trailer type given its size %d\n", trailer->msgh_trailer_size);
                  break;
          }
      }
  
      /* Special message handling */
      switch (msg_id) {
          case 200: /* host_info */
          {
              mig_reply_error_t *err = (mig_reply_error_t *)hdr;
              struct {
                  uint32_t unknow1;
                  uint32_t max_cpus;
                  uint32_t avail_cpus;
                  uint32_t memory_size;
                  uint32_t cpu_type;
                  uint32_t cpu_subtype;
              } *data = (void *)(err+1);
  
              DPRINTF("maxcpu = 0x%x\n",   data->max_cpus);
              DPRINTF("numcpu = 0x%x\n",   data->avail_cpus);
              DPRINTF("memsize = 0x%x\n",  data->memory_size);
  
  #if defined(TARGET_I386)
              data->cpu_type = CPU_TYPE_I386;
              DPRINTF("cpu_type changed to 0x%x(i386)\n", data->cpu_type);
              data->cpu_subtype = CPU_SUBTYPE_PENT;
              DPRINTF("cpu_subtype changed to 0x%x(i386_pent)\n", data->cpu_subtype);
  #elif defined(TARGET_PPC)
              data->cpu_type = CPU_TYPE_POWERPC;
              DPRINTF("cpu_type changed to 0x%x(ppc)\n", data->cpu_type);
              data->cpu_subtype = CPU_SUBTYPE_POWERPC_750;
              DPRINTF("cpu_subtype changed to 0x%x(ppc_all)\n", data->cpu_subtype);
  #else
  # error target not supported
  #endif
              break;
          }
          case 202: /* host_page_size */
          {
              mig_reply_error_t *err = (mig_reply_error_t *)hdr;
              uint32_t *pagesize = (uint32_t *)(err+1);
  
              DPRINTF("pagesize = %d\n", *pagesize);
              break;
          }
          default: break;
      }
  
      swap_mach_msg(hdr, bswap_out);
  
      return ret;
  }
  
  long do_mach_syscall(void *cpu_env, int num, uint32_t arg1, uint32_t arg2, uint32_t arg3,
                  uint32_t arg4, uint32_t arg5, uint32_t arg6, uint32_t arg7,
                  uint32_t arg8)
  {
      extern uint32_t mach_reply_port(void);
  
      long ret = 0;
  
      arg1 = tswap32(arg1);
      arg2 = tswap32(arg2);
      arg3 = tswap32(arg3);
      arg4 = tswap32(arg4);
      arg5 = tswap32(arg5);
      arg6 = tswap32(arg6);
      arg7 = tswap32(arg7);
      arg8 = tswap32(arg8);
  
      DPRINTF("mach syscall %d : " , num);
  
      switch(num) {
      /* see xnu/osfmk/mach/syscall_sw.h */
      case -26:
          DPRINTF("mach_reply_port()\n");
          ret = mach_reply_port();
          break;
      case -27:
          DPRINTF("mach_thread_self()\n");
          ret = mach_thread_self();
          break;
      case -28:
          DPRINTF("mach_task_self()\n");
          ret = mach_task_self();
          break;
      case -29:
          DPRINTF("mach_host_self()\n");
          ret = mach_host_self();
          break;
      case -31:
          DPRINTF("mach_msg_trap(0x%x, 0x%x, 0x%x, 0x%x, 0x%x, 0x%x, 0x%x)\n",
                  arg1, arg2, arg3, arg4, arg5, arg6, arg7);
          ret = target_mach_msg_trap((mach_msg_header_t *)arg1, arg2, arg3, arg4, arg5, arg6, arg7);
          break;
  /* may need more translation if target arch is different from host */
  #if (defined(TARGET_I386) && defined(__i386__)) || (defined(TARGET_PPC) && defined(__ppc__))
      case -33:
          DPRINTF("semaphore_signal_trap(0x%x)\n", arg1);
          ret = semaphore_signal_trap(arg1);
          break;
      case -34:
          DPRINTF("semaphore_signal_all_trap(0x%x)\n", arg1);
          ret = semaphore_signal_all_trap(arg1);
          break;
      case -35:
          DPRINTF("semaphore_signal_thread_trap(0x%x)\n", arg1, arg2);
          ret = semaphore_signal_thread_trap(arg1,arg2);
          break;
  #endif
      case -36:
          DPRINTF("semaphore_wait_trap(0x%x)\n", arg1);
          extern int semaphore_wait_trap(int); // XXX: is there any header for that?
          ret = semaphore_wait_trap(arg1);
          break;
  /* may need more translation if target arch is different from host */
  #if (defined(TARGET_I386) && defined(__i386__)) || (defined(TARGET_PPC) && defined(__ppc__))
      case -37:
          DPRINTF("semaphore_wait_signal_trap(0x%x, 0x%x)\n", arg1, arg2);
          ret = semaphore_wait_signal_trap(arg1,arg2);
          break;
  #endif
      case -43:
          DPRINTF("map_fd(0x%x, 0x%x, 0x%x, 0x%x, 0x%x)\n",
                  arg1, arg2, arg3, arg4, arg5);
          ret = map_fd(arg1, arg2, (void*)arg3, arg4, arg5);
          tswap32s((uint32_t*)arg3);
          break;
  /* may need more translation if target arch is different from host */
  #if (defined(TARGET_I386) && defined(__i386__)) || (defined(TARGET_PPC) && defined(__ppc__))
      case -61:
          DPRINTF("syscall_thread_switch(0x%x, 0x%x, 0x%x)\n",
                  arg1, arg2, arg3);
          ret = syscall_thread_switch(arg1, arg2, arg3);  // just a hint to the scheduler; can drop?
          break;
  #endif
      case -89:
          DPRINTF("mach_timebase_info(0x%x)\n", arg1);
          struct mach_timebase_info info;
          ret = mach_timebase_info(&info);
          if(!is_error(ret))
          {
              struct mach_timebase_info *outInfo = (void*)arg1;
              outInfo->numer = tswap32(info.numer);
              outInfo->denom = tswap32(info.denom);
          }
          break;
      case -90:
          DPRINTF("mach_wait_until()\n");
          extern int mach_wait_until(uint64_t); // XXX: is there any header for that?
          ret = mach_wait_until(((uint64_t)arg2<<32) | (uint64_t)arg1);
          break;
      case -91:
          DPRINTF("mk_timer_create()\n");
          extern int mk_timer_create(); // XXX: is there any header for that?
          ret = mk_timer_create();
          break;
      case -92:
          DPRINTF("mk_timer_destroy()\n");
          extern int mk_timer_destroy(int); // XXX: is there any header for that?
          ret = mk_timer_destroy(arg1);
          break;
      case -93:
          DPRINTF("mk_timer_create()\n");
          extern int mk_timer_arm(int, uint64_t); // XXX: is there any header for that?
          ret = mk_timer_arm(arg1, ((uint64_t)arg3<<32) | (uint64_t)arg2);
          break;
      case -94:
          DPRINTF("mk_timer_cancel()\n");
          extern int mk_timer_cancel(int, uint64_t *); // XXX: is there any header for that?
          ret = mk_timer_cancel(arg1, (uint64_t *)arg2);
          if((!is_error(ret)) && arg2)
              tswap64s((uint64_t *)arg2);
          break;
      default:
          gemu_log("qemu: Unsupported mach syscall: %d(0x%x)\n", num, num);
          gdb_handlesig (cpu_env, SIGTRAP);
          exit(0);
          break;
      }
      return ret;
  }
  
  /* ------------------------------------------------------------
     thread type syscall handling
  */
  long do_thread_syscall(void *cpu_env, int num, uint32_t arg1, uint32_t arg2, uint32_t arg3,
                  uint32_t arg4, uint32_t arg5, uint32_t arg6, uint32_t arg7,
                  uint32_t arg8)
  {
      extern uint32_t cthread_set_self(uint32_t);
      extern uint32_t processor_facilities_used(void);
      long ret = 0;
  
      arg1 = tswap32(arg1);
      arg2 = tswap32(arg2);
      arg3 = tswap32(arg3);
      arg4 = tswap32(arg4);
      arg5 = tswap32(arg5);
      arg6 = tswap32(arg6);
      arg7 = tswap32(arg7);
      arg8 = tswap32(arg8);
  
      DPRINTF("thread syscall %d : " , num);
  
      switch(num) {
  #ifdef TARGET_I386
      case 0x3:
  #endif
      case 0x7FF1: /* cthread_set_self */
          DPRINTF("cthread_set_self(0x%x)\n", (unsigned int)arg1);
          ret = cthread_set_self(arg1);
  #ifdef TARGET_I386
          /* we need to update the LDT with the address of the thread */
          write_dt((void *)(((CPUX86State *) cpu_env)->ldt.base + (4 * sizeof(uint64_t))), arg1, 1,
                   DESC_G_MASK | DESC_B_MASK | DESC_P_MASK | DESC_S_MASK |
                   (3 << DESC_DPL_SHIFT) | (0x2 << DESC_TYPE_SHIFT));
          /* New i386 convention, %gs should be set to our this LDT entry */
          cpu_x86_load_seg(cpu_env, R_GS, 0x27);
          /* Old i386 convention, the kernel returns the selector for the cthread (pre-10.4.8?)*/
          ret = 0x27;
  #endif
          break;
      case 0x7FF2: /* Called the super-fast pthread_self handler by the apple guys */
          DPRINTF("pthread_self()\n");
          ret = (uint32_t)pthread_self();
          break;
      case 0x7FF3:
          DPRINTF("processor_facilities_used()\n");
  #ifdef __i386__
          qerror("processor_facilities_used: not implemented!\n");
  #else
          ret = (uint32_t)processor_facilities_used();
  #endif
          break;
      default:
          gemu_log("qemu: Unsupported thread syscall: %d(0x%x)\n", num, num);
          gdb_handlesig (cpu_env, SIGTRAP);
          exit(0);
          break;
      }
      return ret;
  }
  
  /* ------------------------------------------------------------
     ioctl handling
  */
  static inline void byteswap_termios(struct termios *t)
  {
      tswap32s((uint32_t*)&t->c_iflag);
      tswap32s((uint32_t*)&t->c_oflag);
      tswap32s((uint32_t*)&t->c_cflag);
      tswap32s((uint32_t*)&t->c_lflag);
      /* 20 (char) bytes then */
      tswap32s((uint32_t*)&t->c_ispeed);
      tswap32s((uint32_t*)&t->c_ospeed);
  }
  
  static inline void byteswap_winsize(struct winsize *w)
  {
      tswap16s(&w->ws_row);
      tswap16s(&w->ws_col);
      tswap16s(&w->ws_xpixel);
      tswap16s(&w->ws_ypixel);
  }
  
  #define STRUCT(name, ...) STRUCT_ ## name,
  #define STRUCT_SPECIAL(name) STRUCT_ ## name,
  enum {
  #include "ioctls_types.h"
  };
  #undef STRUCT
  #undef STRUCT_SPECIAL
  
  #define STRUCT(name, ...) const argtype struct_ ## name ## _def[] = {  __VA_ARGS__, TYPE_NULL };
  #define STRUCT_SPECIAL(name)
  #include "ioctls_types.h"
  #undef STRUCT
  #undef STRUCT_SPECIAL
  
  typedef struct IOCTLEntry {
      unsigned int target_cmd;
      unsigned int host_cmd;
      const char *name;
      int access;
      const argtype arg_type[5];
  } IOCTLEntry;
  
  #define IOC_R 0x0001
  #define IOC_W 0x0002
  #define IOC_RW (IOC_R | IOC_W)
  
  #define MAX_STRUCT_SIZE 4096
  
  static IOCTLEntry ioctl_entries[] = {
  #define IOCTL(cmd, access,  ...)                        \
      { cmd, cmd, #cmd, access, {  __VA_ARGS__ } },
  #include "ioctls.h"
      { 0, 0, },
  };
  
  /* ??? Implement proper locking for ioctls.  */
  static long do_ioctl(long fd, long cmd, long arg)
  {
      const IOCTLEntry *ie;
      const argtype *arg_type;
      int ret;
      uint8_t buf_temp[MAX_STRUCT_SIZE];
      int target_size;
      void *argptr;
  
      ie = ioctl_entries;
      for(;;) {
          if (ie->target_cmd == 0) {
              gemu_log("Unsupported ioctl: cmd=0x%04lx\n", cmd);
              return -ENOSYS;
          }
          if (ie->target_cmd == cmd)
              break;
          ie++;
      }
      arg_type = ie->arg_type;
  #if defined(DEBUG)
      gemu_log("ioctl: cmd=0x%04lx (%s)\n", cmd, ie->name);
  #endif
      switch(arg_type[0]) {
      case TYPE_NULL:
          /* no argument */
          ret = get_errno(ioctl(fd, ie->host_cmd));
          break;
      case TYPE_PTRVOID:
      case TYPE_INT:
          /* int argment */
          ret = get_errno(ioctl(fd, ie->host_cmd, arg));
          break;
      case TYPE_PTR:
          arg_type++;
          target_size = thunk_type_size(arg_type, 0);
          switch(ie->access) {
          case IOC_R:
              ret = get_errno(ioctl(fd, ie->host_cmd, buf_temp));
              if (!is_error(ret)) {
                  argptr = lock_user(arg, target_size, 0);
                  thunk_convert(argptr, buf_temp, arg_type, THUNK_TARGET);
                  unlock_user(argptr, arg, target_size);
              }
              break;
          case IOC_W:
              argptr = lock_user(arg, target_size, 1);
              thunk_convert(buf_temp, argptr, arg_type, THUNK_HOST);
              unlock_user(argptr, arg, 0);
              ret = get_errno(ioctl(fd, ie->host_cmd, buf_temp));
              break;
          default:
          case IOC_RW:
              argptr = lock_user(arg, target_size, 1);
              thunk_convert(buf_temp, argptr, arg_type, THUNK_HOST);
              unlock_user(argptr, arg, 0);
              ret = get_errno(ioctl(fd, ie->host_cmd, buf_temp));
              if (!is_error(ret)) {
                  argptr = lock_user(arg, target_size, 0);
                  thunk_convert(argptr, buf_temp, arg_type, THUNK_TARGET);
                  unlock_user(argptr, arg, target_size);
              }
              break;
          }
          break;
      default:
          gemu_log("Unsupported ioctl type: cmd=0x%04lx type=%d\n", cmd, arg_type[0]);
          ret = -ENOSYS;
          break;
      }
      return ret;
  }
  
  /* ------------------------------------------------------------
     Unix syscall handling
  */
  
  static inline void byteswap_attrlist(struct attrlist *a)
  {
      tswap16s(&a->bitmapcount);
      tswap16s(&a->reserved);
      tswap32s(&a->commonattr);
      tswap32s(&a->volattr);
      tswap32s(&a->dirattr);
      tswap32s(&a->fileattr);
      tswap32s(&a->forkattr);
  }
  
  struct attrbuf_header {
      unsigned long length;
  };
  
  static inline void byteswap_attrbuf(struct attrbuf_header *attrbuf, struct attrlist *attrlist)
  {
      DPRINTF("attrBuf.lenght %lx\n", attrbuf->length);
  }
  
  static inline void byteswap_statfs(struct statfs *s)
  {
      tswap16s((uint16_t*)&s->f_otype);
      tswap16s((uint16_t*)&s->f_oflags);
      tswap32s((uint32_t*)&s->f_bsize);
      tswap32s((uint32_t*)&s->f_iosize);
      tswap32s((uint32_t*)&s->f_blocks);
      tswap32s((uint32_t*)&s->f_bfree);
      tswap32s((uint32_t*)&s->f_bavail);
      tswap32s((uint32_t*)&s->f_files);
      tswap32s((uint32_t*)&s->f_ffree);
      tswap32s((uint32_t*)&s->f_fsid.val[0]);
      tswap32s((uint32_t*)&s->f_fsid.val[1]);
      tswap16s((uint16_t*)&s->f_reserved1);
      tswap16s((uint16_t*)&s->f_type);
      tswap32s((uint32_t*)&s->f_flags);
  }
  
  static inline void byteswap_stat(struct stat *s)
  {
      tswap32s((uint32_t*)&s->st_dev);
      tswap32s(&s->st_ino);
      tswap16s(&s->st_mode);
      tswap16s(&s->st_nlink);
      tswap32s(&s->st_uid);
      tswap32s(&s->st_gid);
      tswap32s((uint32_t*)&s->st_rdev);
      tswap32s((uint32_t*)&s->st_atimespec.tv_sec);
      tswap32s((uint32_t*)&s->st_atimespec.tv_nsec);
      tswap32s((uint32_t*)&s->st_mtimespec.tv_sec);
      tswap32s((uint32_t*)&s->st_mtimespec.tv_nsec);
      tswap32s((uint32_t*)&s->st_ctimespec.tv_sec);
      tswap32s((uint32_t*)&s->st_ctimespec.tv_nsec);
      tswap64s((uint64_t*)&s->st_size);
      tswap64s((uint64_t*)&s->st_blocks);
      tswap32s((uint32_t*)&s->st_blksize);
      tswap32s(&s->st_flags);
      tswap32s(&s->st_gen);
  }
  
  static inline void byteswap_dirents(struct dirent *d, int bytes)
  {
      char *b;
      for( b = (char*)d; (int)b < (int)d+bytes; )
      {
          unsigned short s = ((struct dirent *)b)->d_reclen;
          tswap32s(&((struct dirent *)b)->d_ino);
          tswap16s(&((struct dirent *)b)->d_reclen);
          if(s<=0)
              break;
          b += s;
      }
  }
  
  static inline void byteswap_iovec(struct iovec *v, int n)
  {
      int i;
      for(i = 0; i < n; i++)
      {
          tswap32s((uint32_t*)&v[i].iov_base);
          tswap32s((uint32_t*)&v[i].iov_len);
      }
  }
  
  static inline void byteswap_timeval(struct timeval *t)
  {
      tswap32s((uint32_t*)&t->tv_sec);
      tswap32s((uint32_t*)&t->tv_usec);
  }
  
  long do_unix_syscall_indirect(void *cpu_env, int num);
  long do_sync(void);
  long do_exit(uint32_t arg1);
  long do_getlogin(char *out, uint32_t size);
  long do_open(char * arg1, uint32_t arg2, uint32_t arg3);
  long do_getfsstat(struct statfs * arg1, uint32_t arg2, uint32_t arg3);
  long do_sigprocmask(uint32_t arg1, uint32_t * arg2, uint32_t * arg3);
  long do_execve(char* arg1, char ** arg2, char ** arg3);
  long do_getgroups(uint32_t arg1, gid_t * arg2);
  long do_gettimeofday(struct timeval * arg1, void * arg2);
  long do_readv(uint32_t arg1, struct iovec * arg2, uint32_t arg3);
  long do_writev(uint32_t arg1, struct iovec * arg2, uint32_t arg3);
  long do_utimes(char * arg1, struct timeval * arg2);
  long do_futimes(uint32_t arg1, struct timeval * arg2);
  long do_statfs(char * arg1, struct statfs * arg2);
  long do_fstatfs(uint32_t arg1, struct statfs * arg2);
  long do_stat(char * arg1, struct stat * arg2);
  long do_fstat(uint32_t arg1, struct stat * arg2);
  long do_lstat(char * arg1, struct stat * arg2);
  long do_getdirentries(uint32_t arg1, void* arg2, uint32_t arg3, void* arg4);
  long do_lseek(void *cpu_env, int num);
  long do___sysctl(int * name, uint32_t namelen, void * oldp, size_t * oldlenp, void * newp, size_t newlen  /* ignored */);
  long do_getattrlist(void * arg1, void * arg2, void * arg3, uint32_t arg4, uint32_t arg5);
  long do_getdirentriesattr(uint32_t arg1, void * arg2, void * arg3, size_t arg4, void * arg5, void * arg6, void* arg7, uint32_t arg8);
  long do_fcntl(int fd, int cmd, int arg);
  
  long no_syscall(void *cpu_env, int num);
  
  long do_pread(uint32_t arg1, void * arg2, size_t arg3, off_t arg4)
  {
      DPRINTF("0x%x, %p, 0x%lx, 0x%" PRIx64 "\n", arg1, arg2, arg3, arg4);
      long ret = pread(arg1, arg2, arg3, arg4);
      return ret;
  }
  
  long do_read(int d, void *buf, size_t nbytes)
  {
      DPRINTF("0x%x, %p, 0x%lx\n", d, buf, nbytes);
      long ret = get_errno(read(d, buf, nbytes));
      if(!is_error(ret))
          DPRINTF("%x\n", *(uint32_t*)buf);
      return ret;
  }
  
  long unimpl_unix_syscall(void *cpu_env, int num);
  
  typedef long (*syscall_function_t)(void *cpu_env, int num);
  
  
  /* define a table that will handle the syscall number->function association */
  #define VOID    void
  #define INT     (uint32_t)get_int_arg(&i, cpu_env)
  #define INT64   (uint64_t)get_int64_arg(&i, cpu_env)
  #define UINT    (unsigned int)INT
  #define PTR     (void*)INT
  
  #define SIZE    INT
  #define OFFSET  INT64
  
  #define WRAPPER_CALL_DIRECT_0(function, args) long __qemu_##function(void *cpu_env) {  return (long)function(); }
  #define WRAPPER_CALL_DIRECT_1(function, _arg1) long __qemu_##function(void *cpu_env) { int i = 0; typeof(_arg1) arg1 = _arg1;  return (long)function(arg1); }
  #define WRAPPER_CALL_DIRECT_2(function, _arg1, _arg2) long __qemu_##function(void *cpu_env) { int i = 0;  typeof(_arg1) arg1 = _arg1; typeof(_arg2) arg2 = _arg2; return (long)function(arg1, arg2); }
  #define WRAPPER_CALL_DIRECT_3(function, _arg1, _arg2, _arg3) long __qemu_##function(void *cpu_env) { int i = 0;   typeof(_arg1) arg1 = _arg1; typeof(_arg2) arg2 = _arg2; typeof(_arg3) arg3 = _arg3; return (long)function(arg1, arg2, arg3); }
  #define WRAPPER_CALL_DIRECT_4(function, _arg1, _arg2, _arg3, _arg4) long __qemu_##function(void *cpu_env) { int i = 0;   typeof(_arg1) arg1 = _arg1; typeof(_arg2) arg2 = _arg2; typeof(_arg3) arg3 = _arg3; typeof(_arg4) arg4 = _arg4; return (long)function(arg1, arg2, arg3, arg4); }
  #define WRAPPER_CALL_DIRECT_5(function, _arg1, _arg2, _arg3, _arg4, _arg5) long __qemu_##function(void *cpu_env) { int i = 0;   typeof(_arg1) arg1 = _arg1; typeof(_arg2) arg2 = _arg2; typeof(_arg3) arg3 = _arg3; typeof(_arg4) arg4 = _arg4; typeof(_arg5) arg5 = _arg5;  return (long)function(arg1, arg2, arg3, arg4, arg5); }
  #define WRAPPER_CALL_DIRECT_6(function, _arg1, _arg2, _arg3, _arg4, _arg5, _arg6) long __qemu_##function(void *cpu_env) { int i = 0;   typeof(_arg1) arg1 = _arg1; typeof(_arg2) arg2 = _arg2; typeof(_arg3) arg3 = _arg3; typeof(_arg4) arg4 = _arg4; typeof(_arg5) arg5 = _arg5; typeof(_arg6) arg6 = _arg6;  return (long)function(arg1, arg2, arg3, arg4, arg5, arg6); }
  #define WRAPPER_CALL_DIRECT_7(function, _arg1, _arg2, _arg3, _arg4, _arg5, _arg6, _arg7) long __qemu_##function(void *cpu_env) { int i = 0;   typeof(_arg1) arg1 = _arg1; typeof(_arg2) arg2 = _arg2; typeof(_arg3) arg3 = _arg3; typeof(_arg4) arg4 = _arg4; typeof(_arg5) arg5 = _arg5; typeof(_arg6) arg6 = _arg6; typeof(_arg7) arg7 = _arg7; return (long)function(arg1, arg2, arg3, arg4, arg5, arg6, arg7); }
  #define WRAPPER_CALL_DIRECT_8(function, _arg1, _arg2, _arg3, _arg4, _arg5, _arg6, _arg7, _arg8) long __qemu_##function(void *cpu_env) { int i = 0;   typeof(_arg1) arg1 = _arg1; typeof(_arg2) arg2 = _arg2; typeof(_arg3) arg3 = _arg3; typeof(_arg4) arg4 = _arg4; typeof(_arg5) arg5 = _arg5; typeof(_arg6) arg6 = _arg6; typeof(_arg7) arg7 = _arg7; typeof(_arg8) arg8 = _arg8;  return (long)function(arg1, arg2, arg3, arg4, arg5, arg6, arg7, arg8); }
  #define WRAPPER_CALL_DIRECT(function, nargs, ...) WRAPPER_CALL_DIRECT_##nargs(function, __VA_ARGS__)
  #define WRAPPER_CALL_NOERRNO(function, nargs, ...)  WRAPPER_CALL_DIRECT(function, nargs, __VA_ARGS__)
  #define WRAPPER_CALL_INDIRECT(function, nargs, ...)
  #define ENTRY(name, number, function, nargs, call_type, ...)  WRAPPER_##call_type(function, nargs, __VA_ARGS__)
  
  #include "syscalls.h"
  
  #undef ENTRY
  #undef WRAPPER_CALL_DIRECT
  #undef WRAPPER_CALL_NOERRNO
  #undef WRAPPER_CALL_INDIRECT
  #undef OFFSET
  #undef SIZE
  #undef INT
  #undef PTR
  #undef INT64
  
  #define _ENTRY(name, number, function, nargs, call_type) [number] = {\
          name, \
          number, \
          (syscall_function_t)function, \
          nargs, \
          call_type  \
          },
  
  #define ENTRY_CALL_DIRECT(name, number, function, nargs, call_type)  _ENTRY(name, number, __qemu_##function, nargs, call_type)
  #define ENTRY_CALL_NOERRNO(name, number, function, nargs, call_type) ENTRY_CALL_DIRECT(name, number, function, nargs, call_type)
  #define ENTRY_CALL_INDIRECT(name, number, function, nargs, call_type) _ENTRY(name, number, function, nargs, call_type)
  #define ENTRY(name, number, function, nargs, call_type, ...) ENTRY_##call_type(name, number, function, nargs, call_type)
  
  #define CALL_DIRECT 1
  #define CALL_INDIRECT 2
  #define CALL_NOERRNO  (CALL_DIRECT | 4 /* = 5 */)
  
  struct unix_syscall {
      char * name;
      int number;
      syscall_function_t function;
      int nargs;
      int call_type;
  } unix_syscall_table[SYS_MAXSYSCALL] = {
  #include "syscalls.h"
  };
  
  #undef ENTRY
  #undef _ENTRY
  #undef ENTRY_CALL_DIRECT
  #undef ENTRY_CALL_INDIRECT
  #undef ENTRY_CALL_NOERRNO
  
  /* Actual syscalls implementation */
  
  long do_unix_syscall_indirect(void *cpu_env, int num)
  {
      long ret;
      int new_num;
      int i = 0;
  
      new_num = get_int_arg(&i, cpu_env);
  #ifdef TARGET_I386
      ((CPUX86State*)cpu_env)->regs[R_ESP] += 4;
      /* XXX: not necessary */
      ((CPUX86State*)cpu_env)->regs[R_EAX] = new_num;
  #elif TARGET_PPC
      {
          int i;
          uint32_t **regs = ((CPUPPCState*)cpu_env)->gpr;
          for(i = 3; i < 11; i++)
              *regs[i] = *regs[i+1];
          /* XXX: not necessary */
          *regs[0] = new_num;
      }
  #endif
      ret = do_unix_syscall(cpu_env, new_num);
  #ifdef TARGET_I386
      ((CPUX86State*)cpu_env)->regs[R_ESP] -= 4;
      /* XXX: not necessary */
      ((CPUX86State*)cpu_env)->regs[R_EAX] = num;
  #elif TARGET_PPC
      {
          int i;
          /* XXX: not really needed those regs are volatile accross calls */
          uint32_t **regs = ((CPUPPCState*)cpu_env)->gpr;
          for(i = 11; i > 3; i--)
              *regs[i] = *regs[i-1];
          regs[3] = new_num;
          *regs[0] = num;
      }
  #endif
      return ret;
  }
  
  long do_exit(uint32_t arg1)
  {
      exit(arg1);
      /* not reached */
      return -1;
  }
  
  long do_sync(void)
  {
      sync();
      return 0;
  }
  
  long do_getlogin(char *out, uint32_t size)
  {
      char *login = getlogin();
      if(!login)
          return -1;
      memcpy(out, login, size);
      return 0;
  }
  long do_open(char * arg1, uint32_t arg2, uint32_t arg3)
  {
      /* XXX: don't let the %s stay in there */
      DPRINTF("open(%s, 0x%x, 0x%x)\n", arg1, arg2, arg3);
      return get_errno(open(arg1, arg2, arg3));
  }
  
  long do_getfsstat(struct statfs * arg1, uint32_t arg2, uint32_t arg3)
  {
      long ret;
      DPRINTF("getfsstat(%p, 0x%x, 0x%x)\n", arg1, arg2, arg3);
      ret = get_errno(getfsstat(arg1, arg2, arg3));
      if((!is_error(ret)) && arg1)
          byteswap_statfs(arg1);
      return ret;
  }
  
  long do_sigprocmask(uint32_t arg1, uint32_t * arg2, uint32_t * arg3)
  {
      long ret;
      DPRINTF("sigprocmask(%d, %p, %p)\n", arg1, arg2, arg3);
      gemu_log("XXX: sigprocmask not tested (%d, %p, %p)\n", arg1, arg2, arg3);
      if(arg2)
          tswap32s(arg2);
      ret = get_errno(sigprocmask(arg1, (void *)arg2, (void *)arg3));
      if((!is_error(ret)) && arg3)
          tswap32s(arg3);
      if(arg2)
          tswap32s(arg2);
      return ret;
  }
  
  long do_execve(char* arg1, char ** arg2, char ** arg3)
  {
      long ret;
      char **argv = arg2;
      char **envp = arg3;
      int argc;
      int envc;
  
      /* XXX: don't let the %s stay in here */
      DPRINTF("execve(%s, %p, %p)\n", arg1, arg2, arg3);
  
      for(argc = 0; argv[argc]; argc++);
      for(envc = 0; envp[envc]; envc++);
  
      argv = (char**)malloc(sizeof(char*)*argc);
      envp = (char**)malloc(sizeof(char*)*envc);
  
      for(; argc >= 0; argc--)
          argv[argc] = (char*)tswap32((uint32_t)(arg2)[argc]);
  
      for(; envc >= 0; envc--)
          envp[envc] = (char*)tswap32((uint32_t)(arg3)[envc]);
  
      ret = get_errno(execve(arg1, argv, envp));
      free(argv);
      free(envp);
      return ret;
  }
  
  long do_getgroups(uint32_t arg1, gid_t * arg2)
  {
      long ret;
      int i;
      DPRINTF("getgroups(0x%x, %p)\n", arg1, arg2);
      ret = get_errno(getgroups(arg1, arg2));
      if(ret > 0)
          for(i = 0; i < arg1; i++)
              tswap32s(&arg2[i]);
      return ret;
  }
  
  long do_gettimeofday(struct timeval * arg1, void * arg2)
  {
      long ret;
      DPRINTF("gettimeofday(%p, %p)\n",
              arg1, arg2);
      ret = get_errno(gettimeofday(arg1, arg2));
      if(!is_error(ret))
      {
          /* timezone no longer used according to the manpage, so don't bother with it */
          byteswap_timeval(arg1);
      }
      return ret;
  }
  
  long do_readv(uint32_t arg1, struct iovec * arg2, uint32_t arg3)
  {
      long ret;
      DPRINTF("readv(0x%x, %p, 0x%x)\n", arg1, arg2, arg3);
      if(arg2)
          byteswap_iovec(arg2, arg3);
      ret = get_errno(readv(arg1, arg2, arg3));
      if((!is_error(ret)) && arg2)
          byteswap_iovec(arg2, arg3);
      return ret;
  }
  
  long do_writev(uint32_t arg1, struct iovec * arg2, uint32_t arg3)
  {
      long ret;
      DPRINTF("writev(0x%x, %p, 0x%x)\n", arg1, arg2, arg3);
      if(arg2)
          byteswap_iovec(arg2, arg3);
      ret = get_errno(writev(arg1, arg2, arg3));
      if((!is_error(ret)) && arg2)
          byteswap_iovec(arg2, arg3);
      return ret;
  }
  
  long do_utimes(char * arg1, struct timeval * arg2)
  {
      DPRINTF("utimes(%p, %p)\n", arg1, arg2);
      if(arg2)
      {
          byteswap_timeval(arg2);
          byteswap_timeval(arg2+1);
      }
      return get_errno(utimes(arg1, arg2));
  }
  
  long do_futimes(uint32_t arg1, struct timeval * arg2)
  {
      DPRINTF("futimes(0x%x, %p)\n", arg1, arg2);
      if(arg2)
      {
          byteswap_timeval(arg2);
          byteswap_timeval(arg2+1);
      }
      return get_errno(futimes(arg1, arg2));
  }
  
  long do_statfs(char * arg1, struct statfs * arg2)
  {
      long ret;
      DPRINTF("statfs(%p, %p)\n", arg1, arg2);
      ret = get_errno(statfs(arg1, arg2));
      if(!is_error(ret))
          byteswap_statfs(arg2);
      return ret;
  }
  
  long do_fstatfs(uint32_t arg1, struct statfs* arg2)
  {
      long ret;
      DPRINTF("fstatfs(0x%x, %p)\n",
              arg1, arg2);
      ret = get_errno(fstatfs(arg1, arg2));
      if(!is_error(ret))
          byteswap_statfs(arg2);
  
      return ret;
  }
  
  long do_stat(char * arg1, struct stat * arg2)
  {
      long ret;
      /* XXX: don't let the %s stay in there */
      DPRINTF("stat(%s, %p)\n", arg1, arg2);
      ret = get_errno(stat(arg1, arg2));
      if(!is_error(ret))
          byteswap_stat(arg2);
      return ret;
  }
  
  long do_fstat(uint32_t arg1, struct stat * arg2)
  {
      long ret;
      DPRINTF("fstat(0x%x, %p)\n", arg1, arg2);
      ret = get_errno(fstat(arg1, arg2));
      if(!is_error(ret))
          byteswap_stat(arg2);
      return ret;
  }
  
  long do_lstat(char * arg1, struct stat * arg2)
  {
      long ret;
      /* XXX: don't let the %s stay in there */
      DPRINTF("lstat(%s, %p)\n", (const char *)arg1, arg2);
      ret = get_errno(lstat(arg1, arg2));
      if(!is_error(ret))
          byteswap_stat(arg2);
      return ret;
  }
  
  long do_getdirentries(uint32_t arg1, void* arg2, uint32_t arg3, void* arg4)
  {
      long ret;
      DPRINTF("getdirentries(0x%x, %p, 0x%x, %p)\n", arg1, arg2, arg3, arg4);
      if(arg4)
          tswap32s((uint32_t *)arg4);
      ret = get_errno(getdirentries(arg1, arg2, arg3, arg4));
      if(arg4)
          tswap32s((uint32_t *)arg4);
      if(!is_error(ret))
          byteswap_dirents(arg2, ret);
      return ret;
  }
  
  long do_lseek(void *cpu_env, int num)
  {
      long ret;
      int i = 0;
      uint32_t arg1 = get_int_arg(&i, cpu_env);
      uint64_t offset = get_int64_arg(&i, cpu_env);
      uint32_t arg3 = get_int_arg(&i, cpu_env);
      uint64_t r = lseek(arg1, offset, arg3);
  #ifdef TARGET_I386
      /* lowest word in eax, highest in edx */
      ret = r & 0xffffffff; /* will be set to eax after do_unix_syscall exit */
      ((CPUX86State *)cpu_env)->regs[R_EDX] = (uint32_t)((r >> 32) & 0xffffffff) ;
  #elif defined TARGET_PPC
      ret = r & 0xffffffff; /* will be set to r3 after do_unix_syscall exit */
      ((CPUPPCState *)cpu_env)->gpr[4] = (uint32_t)((r >> 32) & 0xffffffff) ;
  #else
      qerror("64 bit ret value on your arch?");
  #endif
      return get_errno(ret);
  }
  
  void no_swap(void * oldp, int size)
  {
  }
  
  void sysctl_tswap32s(void * oldp, int size)
  {
      tswap32s(oldp);
  }
  
  void bswap_oid(uint32_t * oldp, int size)
  {
      int count = size / sizeof(int);
      int i = 0;
      do { tswap32s(oldp + i); } while (++i < count);
  }
  
  void sysctl_usrstack(uint32_t * oldp, int size)
  {
      DPRINTF("sysctl_usrstack: 0x%x\n", *oldp);
      tswap32s(oldp);
  }
  
  void sysctl_ncpu(uint32_t * ncpu, int size)
  {
      *ncpu = 0x1;
      DPRINTF("sysctl_ncpu: 0x%x\n", *ncpu);
      tswap32s(ncpu);
  }
  
  void sysctl_exec(char * exec, int size)
  {
      DPRINTF("sysctl_exec: %s\n", exec);
  }
  
  void sysctl_translate(char * exec, int size)
  {
      DPRINTF("sysctl_translate: %s\n", exec);
  }
  
  struct sysctl_dir {
      int num;
      const char * name;
      void (*swap_func)(void *, int);
      struct sysctl_dir *childs;
  };
  
  #define ENTRYD(num, name, childs) { num, name, NULL, childs }
  #define ENTRYE(num, name, func)   { num, name, (void (*)(void *, int))func, NULL  }
  struct sysctl_dir sysctls_unspec[] = {
      ENTRYE(3,  "oip", bswap_oid),
      { 0, NULL, NULL, NULL }
  };
  
  struct sysctl_dir sysctls_kern[] = {
      ENTRYE(KERN_TRANSLATE,          "translate",    sysctl_translate), /* 44 */
      ENTRYE(KERN_EXEC,               "exec",         sysctl_exec), /* 45 */
      ENTRYE(KERN_USRSTACK32,          "KERN_USRSTACK32", sysctl_usrstack), /* 35 */
      ENTRYE(KERN_SHREG_PRIVATIZABLE,  "KERN_SHREG_PRIVATIZABLE", sysctl_tswap32s), /* 54 */
      { 0, NULL, NULL, NULL }
  };
  
  struct sysctl_dir sysctls_hw[] = {
      ENTRYE(HW_NCPU, "ncpud", sysctl_tswap32s),
      ENTRYE(104, "104", no_swap),
      ENTRYE(105, "105", no_swap),
      { 0, NULL, NULL, NULL }
  };
  
  struct sysctl_dir sysctls[] = {
      ENTRYD(CTL_UNSPEC, "unspec", sysctls_unspec),
      ENTRYD(CTL_KERN, "kern", sysctls_kern),
      ENTRYD(CTL_HW,   "hw",   sysctls_hw ),
      { 0, NULL, NULL, NULL }
  };
  
  #undef ENTRYE
  #undef ENTRYD
  
  static inline struct sysctl_dir * get_sysctl_entry_for_mib(int mib, struct sysctl_dir * sysctl_elmt)
  {
      if(!sysctl_elmt)
          return NULL;
      for(; sysctl_elmt->name != NULL ; sysctl_elmt++) {
          if(sysctl_elmt->num == mib)
              return sysctl_elmt;
      }
      return NULL;
  }
  
  static inline long bswap_syctl(int * mib, int count, void *buf, int size)
  {
      int i;
      struct sysctl_dir * sysctl = sysctls;
      struct sysctl_dir * ret = NULL;
  
      for(i = 0; i < count; i++) {
  
          if(!(ret = sysctl = get_sysctl_entry_for_mib(mib[i], sysctl))) {
              gemu_log("bswap_syctl: can't find mib %d\n", mib[i]);
              return -ENOTDIR;
          }
          if(!(sysctl = sysctl->childs))
              break;
      }
  
      if(ret->childs)
          qerror("we shouldn't have a directory element\n");
  
      ret->swap_func(buf, size);
      return 0;
  }
  
  static inline void print_syctl(int * mib, int count)
  {
      int i;
      struct sysctl_dir * sysctl = sysctls;
      struct sysctl_dir * ret = NULL;
  
      for(i = 0; i < count; i++) {
          if(!(ret = sysctl = get_sysctl_entry_for_mib(mib[i], sysctl))){
              gemu_log("print_syctl: can't find mib %d\n", mib[i]);
              return;
          }
          DPRINTF("%s.", sysctl->name);
          if(!(sysctl = sysctl->childs))
              break;
      }
      DPRINTF("\n");
  }
  
  long do___sysctl(int * name, uint32_t namelen, void * oldp, size_t * oldlenp, void * newp, size_t newlen  /* ignored */)
  {
      long ret = 0;
      int i;
      DPRINTF("sysctl(%p, 0x%x, %p, %p, %p, 0x%lx)\n",
              name, namelen, oldp, oldlenp, newp, newlen);
      if(name) {
          i = 0;
          do { tswap32s( name + i); } while (++i < namelen);
          print_syctl(name, namelen);
          //bswap_syctl(name, namelen, newp, newlen);
          tswap32s((uint32_t*)oldlenp);
      }
  
      if(name) /* Sometimes sysctl is called with no arg1, ignore */
          ret = get_errno(sysctl(name, namelen, oldp, oldlenp, newp, newlen));
  
  #if defined(TARGET_I386) ^ defined(__i386__) || defined(TARGET_PPC) ^ defined(__ppc__)
      if (!is_error(ret) && bswap_syctl(name, namelen, oldp, *oldlenp) != 0) {
          return -ENOTDIR;
      }
  #endif
  
      if(name) {
          //bswap_syctl(name, namelen, newp, newlen);
          tswap32s((uint32_t*)oldlenp);
  
          i = 0;
          do { tswap32s( name + i); } while (++i < namelen);
      }
      return ret;
  }
  
  long do_getattrlist(void * arg1, void * arg2, void * arg3, uint32_t arg4, uint32_t arg5)
  {
      struct attrlist * attrlist = (void *)arg2;
      long ret;
  
  #if defined(TARGET_I386) ^ defined(__i386__) || defined(TARGET_PPC) ^ defined(__ppc__)
      gemu_log("SYS_getdirentriesattr unimplemented\n");
      return -ENOTSUP;
  #endif
      /* XXX: don't let the %s stay in there */
      DPRINTF("getattrlist(%s, %p, %p, 0x%x, 0x%x)\n",
              (char *)arg1, arg2, arg3, arg4, arg5);
  
      if(arg2) /* XXX: We should handle that in a copy especially
          if the structure is not writable */
          byteswap_attrlist(attrlist);
  
      ret = get_errno(getattrlist((const char* )arg1, attrlist, (void *)arg3, arg4, arg5));
  
      if(!is_error(ret))
      {
          byteswap_attrbuf((void *)arg3, attrlist);
          byteswap_attrlist(attrlist);
      }
      return ret;
  }
  
  long do_getdirentriesattr(uint32_t arg1, void * arg2, void * arg3, size_t arg4, void * arg5, void * arg6, void* arg7, uint32_t arg8)
  {
      DPRINTF("getdirentriesattr(0x%x, %p, %p, 0x%lx, %p, %p, %p, 0x%x)\n",
              arg1, arg2, arg3, arg4, arg5, arg6, arg7, arg8);
  #if defined(TARGET_I386) ^ defined(__i386__) || defined(TARGET_PPC) ^ defined(__ppc__)
      qerror("SYS_getdirentriesattr unimplemented\n");
  #endif
  
      return get_errno(getdirentriesattr( arg1, (struct attrlist * )arg2, (void *)arg3, arg4,
                                         (unsigned long *)arg5, (unsigned long *)arg6,
                                         (unsigned long *)arg7, arg8));
  }
  
  static inline void bswap_flock(struct flock *f)
  {
      tswap64s(&f->l_start);
      tswap64s(&f->l_len);
      tswap32s(&f->l_pid);
      tswap16s(&f->l_type);
      tswap16s(&f->l_whence);
  }
  
  static inline void bswap_fstore(struct fstore *f)
  {
      tswap32s(&f->fst_flags);
      tswap32s(&f->fst_posmode);
      tswap64s(&f->fst_offset);
      tswap64s(&f->fst_length);
      tswap64s(&f->fst_bytesalloc);
  }
  
  static inline void bswap_radvisory(struct radvisory *f)
  {
      tswap64s(&f->ra_offset);
      tswap32s(&f->ra_count);
  }
  
  static inline void bswap_fbootstraptransfer(struct fbootstraptransfer *f)
  {
      tswap64s(&f->fbt_offset);
      tswap32s((uint32_t*)&f->fbt_length);
      tswap32s((uint32_t*)&f->fbt_buffer); /* XXX: this is a ptr */
  }
  
  static inline void bswap_log2phys(struct log2phys *f)
  {
      tswap32s(&f->l2p_flags);
      tswap64s(&f->l2p_contigbytes);
      tswap64s(&f->l2p_devoffset);
  }
  
  static inline void bswap_fcntl_arg(int cmd, void * arg)
  {
      switch(cmd)
      {
          case F_DUPFD:
          case F_GETFD:
          case F_SETFD:
          case F_GETFL:
          case F_SETFL:
          case F_GETOWN:
          case F_SETOWN:
          case F_SETSIZE:
          case F_RDAHEAD:
          case F_FULLFSYNC:
              break;
          case F_GETLK:
          case F_SETLK:
          case F_SETLKW:
              bswap_flock(arg);
              break;
          case F_PREALLOCATE:
              bswap_fstore(arg);
              break;
          case F_RDADVISE:
              bswap_radvisory(arg);
              break;
          case F_READBOOTSTRAP:
          case F_WRITEBOOTSTRAP:
              bswap_fbootstraptransfer(arg);
              break;
          case F_LOG2PHYS:
              bswap_log2phys(arg);
              break;
          default:
              gemu_log("unknow cmd in fcntl\n");
      }
  }
  
  long do_fcntl(int fd, int cmd, int arg)
  {
      long ret;
      bswap_fcntl_arg(cmd, (void *)arg);
      ret = get_errno(fcntl(fd, cmd, arg));
      if(!is_error(ret))
          bswap_fcntl_arg(cmd, (void *)arg);
      return ret;
  }
  
  long no_syscall(void *cpu_env, int num)
  {
      /* XXX: We should probably fordward it to the host kernel */
      qerror("no unix syscall %d\n", num);
      /* not reached */
      return -1;
  }
  
  long unimpl_unix_syscall(void *cpu_env, int num)
  {
      if( (num < 0) || (num > SYS_MAXSYSCALL-1) )
          qerror("unix syscall %d is out of unix syscall bounds (0-%d) " , num, SYS_MAXSYSCALL-1);
  
      gemu_log("qemu: Unsupported unix syscall %s %d\n", unix_syscall_table[num].name , num);
      gdb_handlesig (cpu_env, SIGTRAP);
      exit(-1);
  }
  
  long do_unix_syscall(void *cpu_env, int num)
  {
      long ret = 0;
  
      DPRINTF("unix syscall %d: " , num);
  
      if( (num < 0) || (num > SYS_MAXSYSCALL-1) )
          qerror("unix syscall %d is out of unix syscall bounds (0-%d) " , num, SYS_MAXSYSCALL-1);
  
      DPRINTF("%s [%s]", unix_syscall_table[num].name, unix_syscall_table[num].call_type & CALL_DIRECT ? "direct" : "indirect" );
      ret = unix_syscall_table[num].function(cpu_env, num);
  
      if(!(unix_syscall_table[num].call_type & CALL_NOERRNO))
          ret = get_errno(ret);
  
      DPRINTF("[returned 0x%x(%d)]\n", (int)ret, (int)ret);
      return ret;
  }
  
  /* ------------------------------------------------------------
     syscall_init
  */
  void syscall_init(void)
  {
      /* Nothing yet */
  }
  