bsd/uxkern/ux_exception.c

   1 /*
   2  * Copyright (c) 2000-2004 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * The contents of this file constitute Original Code as defined in and
   7  * are subject to the Apple Public Source License Version 1.1 (the
   8  * "License").  You may not use this file except in compliance with the
   9  * License.  Please obtain a copy of the License at
  10  * http://www.apple.com/publicsource and read it before using this file.
  11  *
  12  * This Original Code and all software distributed under the License are
  13  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  14  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  15  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
  17  * License for the specific language governing rights and limitations
  18  * under the License.
  19  *
  20  * @APPLE_LICENSE_HEADER_END@
  21  */
  22 /*
  23  * Mach Operating System
  24  * Copyright (c) 1987 Carnegie-Mellon University
  25  * All rights reserved.  The CMU software License Agreement specifies
  26  * the terms and conditions for use and redistribution.
  27  */
  28
  29 /*
  30  *********************************************************************
  31  * HISTORY
  32  **********************************************************************
  33  */
  34
  35 #include <sys/param.h>
  36
  37 #include <mach/boolean.h>
  38 #include <mach/exception.h>
  39 #include <mach/kern_return.h>
  40 #include <mach/message.h>
  41 #include <mach/port.h>
  42 #include <mach/mach_port.h>
  43 #include <mach/mig_errors.h>
  44 #include <mach/exc_server.h>
  45 #include <kern/task.h>
  46 #include <kern/thread.h>
  47 #include <kern/sched_prim.h>
  48 #include <kern/kalloc.h>
  49
  50 #include <sys/proc.h>
  51 #include <sys/user.h>
  52 #include <sys/systm.h>
  53 #include <sys/ux_exception.h>
  54
  55 #include <vm/vm_protos.h>       /* get_task_ipcspace() */
  56
  57 /*
  58  * XXX Things that should be retrieved from Mach headers, but aren't
  59  */
  60 struct ipc_object;
  61 extern kern_return_t ipc_object_copyin(ipc_space_t space, mach_port_name_t name,
  62                 mach_msg_type_name_t msgt_name, struct ipc_object **objectp);
  63 extern mach_msg_return_t mach_msg_receive(mach_msg_header_t *msg,
  64                 mach_msg_option_t option, mach_msg_size_t rcv_size,
  65                 mach_port_name_t rcv_name, mach_msg_timeout_t rcv_timeout,
  66                 void (*continuation)(mach_msg_return_t),
  67                 mach_msg_size_t slist_size);
  68 extern mach_msg_return_t mach_msg_send(mach_msg_header_t *msg,
  69                 mach_msg_option_t option, mach_msg_size_t send_size,
  70                 mach_msg_timeout_t send_timeout, mach_port_name_t notify);
  71 extern thread_t convert_port_to_thread(ipc_port_t port);
  72 extern void ipc_port_release(ipc_port_t);
  73
  74
  75
  76
  77 /*
  78  *      Unix exception handler.
  79  */
  80
  81 static void     ux_exception(int exception, int code, int subcode,
  82                                 int *ux_signal, int *ux_code);
  83
  84 mach_port_name_t                ux_exception_port;
  85 static task_t                   ux_handler_self;
  86
  87 static
  88 void
  89 ux_handler(void)
  90 {
  91     task_t              self = current_task();
  92     mach_port_name_t    exc_port_name;
  93     mach_port_name_t    exc_set_name;
  94
  95     (void) thread_funnel_set(kernel_flock, TRUE);
  96
  97     /* self->kernel_vm_space = TRUE; */
  98     ux_handler_self = self;
  99
 100
 101     /*
 102      *  Allocate a port set that we will receive on.
 103      */
 104     if (mach_port_allocate(get_task_ipcspace(ux_handler_self), MACH_PORT_RIGHT_PORT_SET,  &exc_set_name) != MACH_MSG_SUCCESS)
 105             panic("ux_handler: port_set_allocate failed");
 106
 107     /*
 108      *  Allocate an exception port and use object_copyin to
 109      *  translate it to the global name.  Put it into the set.
 110      */
 111     if (mach_port_allocate(get_task_ipcspace(ux_handler_self), MACH_PORT_RIGHT_RECEIVE, &exc_port_name) != MACH_MSG_SUCCESS)
 112         panic("ux_handler: port_allocate failed");
 113     if (mach_port_move_member(get_task_ipcspace(ux_handler_self),
 114                         exc_port_name,  exc_set_name) != MACH_MSG_SUCCESS)
 115         panic("ux_handler: port_set_add failed");
 116
 117     if (ipc_object_copyin(get_task_ipcspace(self), exc_port_name,
 118                         MACH_MSG_TYPE_MAKE_SEND,
 119                         (void *) &ux_exception_port) != MACH_MSG_SUCCESS)
 120                 panic("ux_handler: object_copyin(ux_exception_port) failed");
 121
 122     thread_wakeup(&ux_exception_port);
 123
 124     /* Message handling loop. */
 125
 126     for (;;) {
 127         struct rep_msg {
 128                 mach_msg_header_t Head;
 129                 NDR_record_t NDR;
 130                 kern_return_t RetCode;
 131         } rep_msg;
 132         struct exc_msg {
 133                 mach_msg_header_t Head;
 134                 /* start of the kernel processed data */
 135                 mach_msg_body_t msgh_body;
 136                 mach_msg_port_descriptor_t thread;
 137                 mach_msg_port_descriptor_t task;
 138                 /* end of the kernel processed data */
 139                 NDR_record_t NDR;
 140                 exception_type_t exception;
 141                 mach_msg_type_number_t codeCnt;
 142                 exception_data_t code;
 143                 /* some times RCV_TO_LARGE probs */
 144                 char pad[512];
 145         } exc_msg;
 146         mach_port_name_t        reply_port;
 147         kern_return_t    result;
 148
 149         exc_msg.Head.msgh_local_port = (mach_port_t)exc_set_name;
 150         exc_msg.Head.msgh_size = sizeof (exc_msg);
 151 #if 0
 152         result = mach_msg_receive(&exc_msg.Head);
 153 #else
 154         result = mach_msg_receive(&exc_msg.Head, MACH_RCV_MSG,
 155                              sizeof (exc_msg), exc_set_name,
 156                              MACH_MSG_TIMEOUT_NONE, MACH_PORT_NULL,
 157                              0);
 158 #endif
 159         if (result == MACH_MSG_SUCCESS) {
 160             reply_port = (mach_port_name_t)exc_msg.Head.msgh_remote_port;
 161
 162             if (exc_server(&exc_msg.Head, &rep_msg.Head))
 163                 (void) mach_msg_send(&rep_msg.Head, MACH_SEND_MSG,
 164                         sizeof (rep_msg),MACH_MSG_TIMEOUT_NONE,MACH_PORT_NULL);
 165
 166             if (reply_port != MACH_PORT_NULL)
 167                 (void) mach_port_deallocate(get_task_ipcspace(ux_handler_self), reply_port);
 168         }
 169         else if (result == MACH_RCV_TOO_LARGE)
 170                 /* ignore oversized messages */;
 171         else
 172                 panic("exception_handler");
 173     }
 174         thread_funnel_set(kernel_flock, FALSE);
 175 }
 176
 177 void
 178 ux_handler_init(void)
 179 {
 180         ux_exception_port = MACH_PORT_NULL;
 181         (void) kernel_thread(kernel_task, ux_handler);
 182         if (ux_exception_port == MACH_PORT_NULL)  {
 183                 assert_wait(&ux_exception_port, THREAD_UNINT);
 184                 thread_block(THREAD_CONTINUE_NULL);
 185                 }
 186 }
 187
 188 kern_return_t
 189 catch_exception_raise(
 190         __unused mach_port_t exception_port,
 191         mach_port_t thread,
 192         mach_port_t task,
 193         exception_type_t exception,
 194         exception_data_t code,
 195         __unused mach_msg_type_number_t codeCnt
 196 )
 197 {
 198         task_t          self = current_task();
 199         thread_t        th_act;
 200         ipc_port_t      thread_port;
 201         kern_return_t   result = MACH_MSG_SUCCESS;
 202         int             ux_signal = 0;
 203         u_long          ucode = 0;
 204         struct uthread *ut;
 205         mach_port_name_t thread_name = (mach_port_name_t)thread; /* XXX */
 206         mach_port_name_t task_name = (mach_port_name_t)task;    /* XXX */
 207
 208    /*
 209      *  Convert local thread name to global port.
 210      */
 211    if (MACH_PORT_VALID(thread_name) &&
 212        (ipc_object_copyin(get_task_ipcspace(self), thread_name,
 213                        MACH_MSG_TYPE_PORT_SEND,
 214                        (void *) &thread_port) == MACH_MSG_SUCCESS)) {
 215         if (IPC_PORT_VALID(thread_port)) {
 216            th_act = convert_port_to_thread(thread_port);
 217            ipc_port_release(thread_port);
 218         } else {
 219            th_act = THREAD_NULL;
 220         }
 221
 222         /*
 223          *      Catch bogus ports
 224          */
 225         if (th_act != THREAD_NULL) {
 226
 227             /*
 228              *  Convert exception to unix signal and code.
 229              */
 230                 ut = get_bsdthread_info(th_act);
 231             ux_exception(exception, code[0], code[1],
 232                                 &ux_signal, (int *)&ucode);
 233
 234             /*
 235              *  Send signal.
 236              */
 237             if (ux_signal != 0)
 238                 threadsignal(th_act, ux_signal, ucode);
 239
 240             thread_deallocate(th_act);
 241         }
 242         else
 243             result = KERN_INVALID_ARGUMENT;
 244     }
 245     else
 246         result = KERN_INVALID_ARGUMENT;
 247
 248     /*
 249      *  Delete our send rights to the task and thread ports.
 250      */
 251     (void)mach_port_deallocate(get_task_ipcspace(ux_handler_self), task_name);
 252     (void)mach_port_deallocate(get_task_ipcspace(ux_handler_self), thread_name);
 253
 254     return (result);
 255 }
 256
 257 kern_return_t
 258 catch_exception_raise_state(
 259         __unused mach_port_t exception_port,
 260         __unused exception_type_t exception,
 261         __unused const exception_data_t code,
 262         __unused mach_msg_type_number_t codeCnt,
 263         __unused int *flavor,
 264         __unused const thread_state_t old_state,
 265         __unused mach_msg_type_number_t old_stateCnt,
 266         __unused thread_state_t new_state,
 267         __unused mach_msg_type_number_t *new_stateCnt)
 268 {
 269         return(KERN_INVALID_ARGUMENT);
 270 }
 271
 272 kern_return_t
 273 catch_exception_raise_state_identity(
 274         __unused mach_port_t exception_port,
 275         __unused mach_port_t thread,
 276         __unused mach_port_t task,
 277         __unused exception_type_t exception,
 278         __unused exception_data_t code,
 279         __unused mach_msg_type_number_t codeCnt,
 280         __unused int *flavor,
 281         __unused thread_state_t old_state,
 282         __unused mach_msg_type_number_t old_stateCnt,
 283         __unused thread_state_t new_state,
 284         __unused mach_msg_type_number_t *new_stateCnt)
 285 {
 286         return(KERN_INVALID_ARGUMENT);
 287 }
 288
 289 /*
 290  *      ux_exception translates a mach exception, code and subcode to
 291  *      a signal and u.u_code.  Calls machine_exception (machine dependent)
 292  *      to attempt translation first.
 293  */
 294
 295 static
 296 void ux_exception(
 297     int                 exception,
 298     int                 code,
 299     int                 subcode,
 300     int                 *ux_signal,
 301     int                 *ux_code
 302 )
 303 {
 304     /*
 305      *  Try machine-dependent translation first.
 306      */
 307     if (machine_exception(exception, code, subcode, ux_signal, ux_code))
 308         return;
 309
 310     switch(exception) {
 311
 312         case EXC_BAD_ACCESS:
 313                 if (code == KERN_INVALID_ADDRESS)
 314                         *ux_signal = SIGSEGV;
 315                 else
 316                         *ux_signal = SIGBUS;
 317                 break;
 318
 319         case EXC_BAD_INSTRUCTION:
 320             *ux_signal = SIGILL;
 321             break;
 322
 323         case EXC_ARITHMETIC:
 324             *ux_signal = SIGFPE;
 325             break;
 326
 327         case EXC_EMULATION:
 328             *ux_signal = SIGEMT;
 329             break;
 330
 331         case EXC_SOFTWARE:
 332             switch (code) {
 333
 334             case EXC_UNIX_BAD_SYSCALL:
 335                 *ux_signal = SIGSYS;
 336                 break;
 337             case EXC_UNIX_BAD_PIPE:
 338                 *ux_signal = SIGPIPE;
 339                 break;
 340             case EXC_UNIX_ABORT:
 341                 *ux_signal = SIGABRT;
 342                 break;
 343             case EXC_SOFT_SIGNAL:
 344                 *ux_signal = SIGKILL;
 345                 break;
 346             }
 347             break;
 348
 349         case EXC_BREAKPOINT:
 350             *ux_signal = SIGTRAP;
 351             break;
 352     }
 353 }