emul_netbsd.c

这个是LINUX下的GDB调度工具的源码

			      name,
			      processor,
			      cia);
  name += sizeof(mib);

  /* see what to do with it ... */
  switch ((int)mib) {
  case 6/*CTL_HW*/:
#if WITH_NetBSD_HOST && (CTL_HW != 6)
#  error "CTL_HW"
#endif
    if (namelen < 2)
      error("system_call()SYS___sysctl - CTL_HW - bad name[1]\n");
    mib = vm_data_map_read_word(cpu_data_map(processor),
				name,
				processor,
				cia);
    name += sizeof(mib);
    switch ((int)mib) {
    case 7/*HW_PAGESIZE*/:
#if WITH_NetBSD_HOST && (HW_PAGESIZE != 7)
#  error "HW_PAGESIZE"
#endif
      oldlen = vm_data_map_read_word(cpu_data_map(processor),
				     oldlenp,
				     processor,
				     cia);
      if (sizeof(natural_word) > oldlen)
	error("system_call()sysctl - CTL_HW.HW_PAGESIZE - to small\n");
      int_val = 8192;
      oldlen = sizeof(int_val);
      emul_write_word(oldp, int_val, processor, cia);
      emul_write_word(oldlenp, oldlen, processor, cia);
      break;
    default:
      error("sysctl() CTL_HW.%d unknown\n", mib);
      break;
    }
    break;
  default:
    error("sysctl() name[0]=%d unknown\n", (int)mib);
    break;
  }
  emul_write_status(processor, 0, 0); /* always succeed */
}



static emul_syscall_descriptor netbsd_descriptors[] = {
  /* 0 */ { 0, "syscall" },
  /* 1 */ { do_exit, "exit" },
  /* 2 */ { 0, "fork" },
  /* 3 */ { do_read, "read" },
  /* 4 */ { do_write, "write" },
  /* 5 */ { do_open, "open" },
  /* 6 */ { do_close, "close" },
  /* 7 */ { 0, "wait4" },
  { 0, }, /* 8 is old creat */
  /* 9 */ { 0, "link" },
  /* 10 */ { 0, "unlink" },
  { 0, }, /* 11 is obsolete execv */
  /* 12 */ { 0, "chdir" },
  /* 13 */ { 0, "fchdir" },
  /* 14 */ { 0, "mknod" },
  /* 15 */ { 0, "chmod" },
  /* 16 */ { 0, "chown" },
  /* 17 */ { do_break, "break" },
  /* 18 */ { 0, "getfsstat" },
  { 0, }, /* 19 is old lseek */
  /* 20 */ { do_getpid, "getpid" },
  /* 21 */ { 0, "mount" },
  /* 22 */ { 0, "unmount" },
  /* 23 */ { 0, "setuid" },
  /* 24 */ { do_getuid, "getuid" },
  /* 25 */ { do_geteuid, "geteuid" },
  /* 26 */ { 0, "ptrace" },
  /* 27 */ { 0, "recvmsg" },
  /* 28 */ { 0, "sendmsg" },
  /* 29 */ { 0, "recvfrom" },
  /* 30 */ { 0, "accept" },
  /* 31 */ { 0, "getpeername" },
  /* 32 */ { 0, "getsockname" },
  /* 33 */ { 0, "access" },
  /* 34 */ { 0, "chflags" },
  /* 35 */ { 0, "fchflags" },
  /* 36 */ { 0, "sync" },
  /* 37 */ { do_kill, "kill" },
  { 0, }, /* 38 is old stat */
  /* 39 */ { 0, "getppid" },
  { 0, }, /* 40 is old lstat */
  /* 41 */ { do_dup, "dup" },
  /* 42 */ { 0, "pipe" },
  /* 43 */ { do_getegid, "getegid" },
  /* 44 */ { 0, "profil" },
  /* 45 */ { 0, "ktrace" },
  /* 46 */ { 0, "sigaction" },
  /* 47 */ { do_getgid, "getgid" },
  /* 48 */ { do_sigprocmask, "sigprocmask" },
  /* 49 */ { 0, "getlogin" },
  /* 50 */ { 0, "setlogin" },
  /* 51 */ { 0, "acct" },
  /* 52 */ { 0, "sigpending" },
  /* 53 */ { 0, "sigaltstack" },
  /* 54 */ { do_ioctl, "ioctl" },
  /* 55 */ { 0, "reboot" },
  /* 56 */ { 0, "revoke" },
  /* 57 */ { 0, "symlink" },
  /* 58 */ { 0, "readlink" },
  /* 59 */ { 0, "execve" },
  /* 60 */ { do_umask, "umask" },
  /* 61 */ { 0, "chroot" },
  { 0, }, /* 62 is old fstat */
  { 0, }, /* 63 is old getkerninfo */
  { 0, }, /* 64 is old getpagesize */
  /* 65 */ { 0, "msync" },
  /* 66 */ { 0, "vfork" },
  { 0, }, /* 67 is obsolete vread */
  { 0, }, /* 68 is obsolete vwrite */
  /* 69 */ { 0, "sbrk" },
  /* 70 */ { 0, "sstk" },
  { 0, }, /* 71 is old mmap */
  /* 72 */ { 0, "vadvise" },
  /* 73 */ { 0, "munmap" },
  /* 74 */ { 0, "mprotect" },
  /* 75 */ { 0, "madvise" },
  { 0, }, /* 76 is obsolete vhangup */
  { 0, }, /* 77 is obsolete vlimit */
  /* 78 */ { 0, "mincore" },
  /* 79 */ { 0, "getgroups" },
  /* 80 */ { 0, "setgroups" },
  /* 81 */ { 0, "getpgrp" },
  /* 82 */ { 0, "setpgid" },
  /* 83 */ { 0, "setitimer" },
  { 0, }, /* 84 is old wait */
  /* 85 */ { 0, "swapon" },
  /* 86 */ { 0, "getitimer" },
  { 0, }, /* 87 is old gethostname */
  { 0, }, /* 88 is old sethostname */
  { 0, }, /* 89 is old getdtablesize */
  { do_dup2, "dup2" },
  { 0, }, /* 91 */
  /* 92 */ { do_fcntl, "fcntl" },
  /* 93 */ { 0, "select" },
  { 0, }, /* 94 */
  /* 95 */ { 0, "fsync" },
  /* 96 */ { 0, "setpriority" },
  /* 97 */ { 0, "socket" },
  /* 98 */ { 0, "connect" },
  { 0, }, /* 99 is old accept */
  /* 100 */ { 0, "getpriority" },
  { 0, }, /* 101 is old send */
  { 0, }, /* 102 is old recv */
  /* 103 */ { 0, "sigreturn" },
  /* 104 */ { 0, "bind" },
  /* 105 */ { 0, "setsockopt" },
  /* 106 */ { 0, "listen" },
  { 0, }, /* 107 is obsolete vtimes */
  { 0, }, /* 108 is old sigvec */
  { 0, }, /* 109 is old sigblock */
  { 0, }, /* 110 is old sigsetmask */
  /* 111 */ { 0, "sigsuspend" },
  { 0, }, /* 112 is old sigstack */
  { 0, }, /* 113 is old recvmsg */
  { 0, }, /* 114 is old sendmsg */
  /* - is obsolete vtrace */ { 0, "vtrace	115" },
  /* 116 */ { do_gettimeofday, "gettimeofday" },
  /* 117 */ { do_getrusage, "getrusage" },
  /* 118 */ { 0, "getsockopt" },
  /* 119 */ { 0, "resuba" },
  /* 120 */ { 0, "readv" },
  /* 121 */ { 0, "writev" },
  /* 122 */ { 0, "settimeofday" },
  /* 123 */ { 0, "fchown" },
  /* 124 */ { 0, "fchmod" },
  { 0, }, /* 125 is old recvfrom */
  { 0, }, /* 126 is old setreuid */
  { 0, }, /* 127 is old setregid */
  /* 128 */ { 0, "rename" },
  { 0, }, /* 129 is old truncate */
  { 0, }, /* 130 is old ftruncate */
  /* 131 */ { 0, "flock" },
  /* 132 */ { 0, "mkfifo" },
  /* 133 */ { 0, "sendto" },
  /* 134 */ { 0, "shutdown" },
  /* 135 */ { 0, "socketpair" },
  /* 136 */ { 0, "mkdir" },
  /* 137 */ { 0, "rmdir" },
  /* 138 */ { 0, "utimes" },
  { 0, }, /* 139 is obsolete 4.2 sigreturn */
  /* 140 */ { 0, "adjtime" },
  { 0, }, /* 141 is old getpeername */
  { 0, }, /* 142 is old gethostid */
  { 0, }, /* 143 is old sethostid */
  { 0, }, /* 144 is old getrlimit */
  { 0, }, /* 145 is old setrlimit */
  { 0, }, /* 146 is old killpg */
  /* 147 */ { 0, "setsid" },
  /* 148 */ { 0, "quotactl" },
  { 0, }, /* 149 is old quota */
  { 0, }, /* 150 is old getsockname */
  { 0, }, /* 151 */
  { 0, }, /* 152 */
  { 0, }, /* 153 */
  { 0, }, /* 154 */
  /* 155 */ { 0, "nfssvc" },
  { 0, }, /* 156 is old getdirentries */
  /* 157 */ { 0, "statfs" },
  /* 158 */ { do_fstatfs, "fstatfs" },
  { 0, }, /* 159 */
  { 0, }, /* 160 */
  /* 161 */ { 0, "getfh" },
  { 0, }, /* 162 is old getdomainname */
  { 0, }, /* 163 is old setdomainname */
  { 0, }, /* 164 is old uname */
  /* 165 */ { 0, "sysarch" },
  { 0, }, /* 166 */
  { 0, }, /* 167 */
  { 0, }, /* 168 */
  /* 169 */ { 0, "semsys" },
  /* 170 */ { 0, "msgsys" },
  /* 171 */ { 0, "shmsys" },
  { 0, }, /* 172 */
  { 0, }, /* 173 */
  { 0, }, /* 174 */
  { 0, }, /* 175 */
  { 0, }, /* 176 */
  { 0, }, /* 177 */
  { 0, }, /* 178 */
  { 0, }, /* 179 */
  { 0, }, /* 180 */
  /* 181 */ { 0, "setgid" },
  /* 182 */ { 0, "setegid" },
  /* 183 */ { 0, "seteuid" },
  /* 184 */ { 0, "lfs_bmapv" },
  /* 185 */ { 0, "lfs_markv" },
  /* 186 */ { 0, "lfs_segclean" },
  /* 187 */ { 0, "lfs_segwait" },
  /* 188 */ { do_stat, "stat" },
  /* 189 */ { do_fstat, "fstat" },
  /* 190 */ { do_lstat, "lstat" },
  /* 191 */ { 0, "pathconf" },
  /* 192 */ { 0, "fpathconf" },
  { 0, }, /* 193 */
  /* 194 */ { 0, "getrlimit" },
  /* 195 */ { 0, "setrlimit" },
  /* 196 */ { do_getdirentries, "getdirentries" },
  /* 197 */ { 0, "mmap" },
  /* 198 */ { do___syscall, "__syscall" },
  /* 199 */ { do_lseek, "lseek" },
  /* 200 */ { 0, "truncate" },
  /* 201 */ { 0, "ftruncate" },
  /* 202 */ { do___sysctl, "__sysctl" },
  /* 203 */ { 0, "mlock" },
  /* 204 */ { 0, "munlock" },
};

static char *(netbsd_error_names[]) = {
  /* 0 */ "ESUCCESS",
  /* 1 */ "EPERM",
  /* 2 */ "ENOENT",
  /* 3 */ "ESRCH",
  /* 4 */ "EINTR",
  /* 5 */ "EIO",
  /* 6 */ "ENXIO",
  /* 7 */ "E2BIG",
  /* 8 */ "ENOEXEC",
  /* 9 */ "EBADF",
  /* 10 */ "ECHILD",
  /* 11 */ "EDEADLK",
  /* 12 */ "ENOMEM",
  /* 13 */ "EACCES",
  /* 14 */ "EFAULT",
  /* 15 */ "ENOTBLK",
  /* 16 */ "EBUSY",
  /* 17 */ "EEXIST",
  /* 18 */ "EXDEV",
  /* 19 */ "ENODEV",
  /* 20 */ "ENOTDIR",
  /* 21 */ "EISDIR",
  /* 22 */ "EINVAL",
  /* 23 */ "ENFILE",
  /* 24 */ "EMFILE",
  /* 25 */ "ENOTTY",
  /* 26 */ "ETXTBSY",
  /* 27 */ "EFBIG",
  /* 28 */ "ENOSPC",
  /* 29 */ "ESPIPE",
  /* 30 */ "EROFS",
  /* 31 */ "EMLINK",
  /* 32 */ "EPIPE",
  /* 33 */ "EDOM",
  /* 34 */ "ERANGE",
  /* 35 */ "EAGAIN",
  /* 36 */ "EINPROGRESS",
  /* 37 */ "EALREADY",
  /* 38 */ "ENOTSOCK",
  /* 39 */ "EDESTADDRREQ",
  /* 40 */ "EMSGSIZE",
  /* 41 */ "EPROTOTYPE",
  /* 42 */ "ENOPROTOOPT",
  /* 43 */ "EPROTONOSUPPORT",
  /* 44 */ "ESOCKTNOSUPPORT",
  /* 45 */ "EOPNOTSUPP",
  /* 46 */ "EPFNOSUPPORT",
  /* 47 */ "EAFNOSUPPORT",
  /* 48 */ "EADDRINUSE",
  /* 49 */ "EADDRNOTAVAIL",
  /* 50 */ "ENETDOWN",
  /* 51 */ "ENETUNREACH",
  /* 52 */ "ENETRESET",
  /* 53 */ "ECONNABORTED",
  /* 54 */ "ECONNRESET",
  /* 55 */ "ENOBUFS",
  /* 56 */ "EISCONN",
  /* 57 */ "ENOTCONN",
  /* 58 */ "ESHUTDOWN",
  /* 59 */ "ETOOMANYREFS",
  /* 60 */ "ETIMEDOUT",
  /* 61 */ "ECONNREFUSED",
  /* 62 */ "ELOOP",
  /* 63 */ "ENAMETOOLONG",
  /* 64 */ "EHOSTDOWN",
  /* 65 */ "EHOSTUNREACH",
  /* 66 */ "ENOTEMPTY",
  /* 67 */ "EPROCLIM",
  /* 68 */ "EUSERS",
  /* 69 */ "EDQUOT",
  /* 70 */ "ESTALE",
  /* 71 */ "EREMOTE",
  /* 72 */ "EBADRPC",
  /* 73 */ "ERPCMISMATCH",
  /* 74 */ "EPROGUNAVAIL",
  /* 75 */ "EPROGMISMATCH",
  /* 76 */ "EPROCUNAVAIL",
  /* 77 */ "ENOLCK",
  /* 78 */ "ENOSYS",
  /* 79 */ "EFTYPE",
  /* 80 */ "EAUTH",
  /* 81 */ "ENEEDAUTH",
  /* 81 */ "ELAST",
};

static char *(netbsd_signal_names[]) = {
  /* 0 */ 0,
  /* 1 */ "SIGHUP",
  /* 2 */ "SIGINT",
  /* 3 */ "SIGQUIT",
  /* 4 */ "SIGILL",
  /* 5 */ "SIGTRAP",
  /* 6 */ "SIGABRT",
  /* 7 */ "SIGEMT",
  /* 8 */ "SIGFPE",
  /* 9 */ "SIGKILL",
  /* 10 */ "SIGBUS",
  /* 11 */ "SIGSEGV",
  /* 12 */ "SIGSYS",
  /* 13 */ "SIGPIPE",
  /* 14 */ "SIGALRM",
  /* 15 */ "SIGTERM",
  /* 16 */ "SIGURG",
  /* 17 */ "SIGSTOP",
  /* 18 */ "SIGTSTP",
  /* 19 */ "SIGCONT",
  /* 20 */ "SIGCHLD",
  /* 21 */ "SIGTTIN",
  /* 22 */ "SIGTTOU",
  /* 23 */ "SIGIO",
  /* 24 */ "SIGXCPU",
  /* 25 */ "SIGXFSZ",
  /* 26 */ "SIGVTALRM",
  /* 27 */ "SIGPROF",
  /* 28 */ "SIGWINCH",
  /* 29 */ "SIGINFO",
  /* 30 */ "SIGUSR1",
  /* 31 */ "SIGUSR2",
};

static emul_syscall emul_netbsd_syscalls = {
  netbsd_descriptors,
  sizeof(netbsd_descriptors) / sizeof(netbsd_descriptors[0]),
  netbsd_error_names,
  sizeof(netbsd_error_names) / sizeof(netbsd_error_names[0]),
  netbsd_signal_names,
  sizeof(netbsd_signal_names) / sizeof(netbsd_signal_names[0]),
};


/* NetBSD's os_emul interface, most are just passed on to the generic
   syscall stuff */

static os_emul_data *
emul_netbsd_create(device *root,
		   bfd *image,
		   const char *name)
{
  unsigned_word top_of_stack;
  unsigned stack_size;
  int elf_binary;
  os_emul_data *bsd_data;
  device *vm;

  /* check that this emulation is really for us */
  if (name != NULL && strcmp(name, "netbsd") != 0)
    return NULL;
  if (image == NULL)
    return NULL;


  /* merge any emulation specific entries into the device tree */

  /* establish a few defaults */
  if (image->xvec->flavour == bfd_target_elf_flavour) {
    elf_binary = 1;
    top_of_stack = 0xe0000000;
    stack_size =   0x00100000;
  }
  else {
    elf_binary = 0;
    top_of_stack = 0x20000000;
    stack_size =   0x00100000;
  }

  /* options */
  emul_add_tree_options(root, image, "netbsd",
			(WITH_ENVIRONMENT == USER_ENVIRONMENT
			 ? "user" : "virtual"),
			0 /*oea-interrupt-prefix*/);

  /* virtual memory - handles growth of stack/heap */
  vm = tree_parse(root, "/openprom/vm");
  tree_parse(vm, "./stack-base 0x%lx",
	     (unsigned long)(top_of_stack - stack_size));
  tree_parse(vm, "./nr-bytes 0x%x", stack_size);

  tree_parse(root, "/openprom/vm/map-binary/file-name %s",
	     bfd_get_filename(image));

  /* finish the init */
  tree_parse(root, "/openprom/init/register/pc 0x%lx",
	     (unsigned long)bfd_get_start_address(image));
  tree_parse(root, "/openprom/init/register/sp 0x%lx",
	     (unsigned long)top_of_stack);
  tree_parse(root, "/openprom/init/register/msr 0x%x",
	     ((tree_find_boolean_property(root, "/options/little-endian?")
	       ? msr_little_endian_mode
	       : 0)
	      | (tree_find_boolean_property(root, "/openprom/options/floating-point?")
		 ? (msr_floating_point_available
		    | msr_floating_point_exception_mode_0
		    | msr_floating_point_exception_mode_1)
		 : 0)));
  tree_parse(root, "/openprom/init/stack/stack-type %s",
	     (elf_binary ? "ppc-elf" : "ppc-xcoff"));

  /* finally our emulation data */
  bsd_data = ZALLOC(os_emul_data);
  bsd_data->vm = vm;
  bsd_data->syscalls = &emul_netbsd_syscalls;
  return bsd_data;
}

static void
emul_netbsd_init(os_emul_data *emul_data,
		 int nr_cpus)
{
  /* nothing yet */
}

static void
emul_netbsd_system_call(cpu *processor,
			unsigned_word cia,
			os_emul_data *emul_data)
{
  emul_do_system_call(emul_data,
		      emul_data->syscalls,
		      cpu_registers(processor)->gpr[0],
		      3, /*r3 contains arg0*/
		      processor,
		      cia);
}

const os_emul emul_netbsd = {
  "netbsd",
  emul_netbsd_create,
  emul_netbsd_init,
  emul_netbsd_system_call,
  0, /*instruction_call*/
  0 /*data*/
};

#endif	/* _EMUL_NETBSD_C_ */