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initial import
This commit is contained in:
Roland McGrath
143
hurd/hurdfault.c
Normal file
143
hurd/hurdfault.c
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/* Handle faults in the signal thread.
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Copyright (C) 1994 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If
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not, write to the Free Software Foundation, Inc., 675 Mass Ave,
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Cambridge, MA 02139, USA. */
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#include <hurd.h>
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#include <hurd/signal.h>
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#include "hurdfault.h"
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#include <errno.h>
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#include <string.h>
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#include <setjmp.h>
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#include <stdio.h>
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#include "thread_state.h"
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#include "faultexc.h" /* mig-generated header for our exc server. */
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jmp_buf _hurdsig_fault_env;
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static mach_port_t forward_sigexc;
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int _hurdsig_fault_expect_signo;
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long int _hurdsig_fault_sigcode;
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int _hurdsig_fault_sigerror;
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kern_return_t
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_hurdsig_fault_catch_exception_raise (mach_port_t port,
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thread_t thread,
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task_t task,
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int exception,
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int code,
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int subcode)
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{
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int signo;
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if (port != forward_sigexc ||
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thread != _hurd_msgport_thread || task != __mach_task_self ())
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return EPERM; /* Strange bogosity. */
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/* Call the machine-dependent function to translate the Mach exception
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codes into a signal number and subcode. */
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_hurd_exception2signal (exception, code, subcode, &signo,
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&_hurdsig_fault_sigcode, &_hurdsig_fault_sigerror);
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return signo == _hurdsig_fault_expect_signo ? 0 : EGREGIOUS;
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}
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static void
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faulted (void)
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{
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struct
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{
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mach_msg_header_t head;
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char buf[64];
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} request;
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struct
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{
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mach_msg_header_t head;
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mach_msg_type_t type;
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int result;
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} reply;
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extern int _hurdsig_fault_exc_server (mach_msg_header_t *,
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mach_msg_header_t *);
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/* Wait for the exception_raise message forwarded by the proc server. */
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if (__mach_msg (&request.head, MACH_RCV_MSG, 0,
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sizeof request, forward_sigexc,
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MACH_MSG_TIMEOUT_NONE, MACH_PORT_NULL)
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!= MACH_MSG_SUCCESS)
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__libc_fatal ("msg receive failed on signal thread exc\n");
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/* Run the exc demuxer which should call the server function above.
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That function returns 0 if the exception was expected. */
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switch (_hurdsig_fault_exc_server (&request.head, &reply.head))
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{
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case KERN_SUCCESS:
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if (reply.head.msgh_remote_port != MACH_PORT_NULL)
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__mach_msg (&reply.head, MACH_SEND_MSG, reply.head.msgh_size,
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0, MACH_PORT_NULL, MACH_MSG_TIMEOUT_NONE, MACH_PORT_NULL);
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break;
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default:
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__mach_msg_destroy (&request.head);
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case MIG_NO_REPLY:
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}
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_hurdsig_fault_expect_signo = 0;
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longjmp (_hurdsig_fault_env, 1);
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}
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static char faultstack[1024];
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/* Send exceptions for the signal thread to the proc server.
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It will forward the message on to our message port,
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and then restore the thread's state to code which
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does `longjmp (_hurd_sigthread_fault_env, 1)'. */
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void
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_hurdsig_fault_init (void)
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{
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error_t err;
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struct machine_thread_state state;
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mach_port_t sigexc;
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if (err = __mach_port_allocate (__mach_task_self (),
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MACH_PORT_RIGHT_RECEIVE, &sigexc))
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__libc_fatal ("hurd: Can't create receive right for signal thread exc\n");
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if (err = __mach_port_allocate (__mach_task_self (),
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MACH_PORT_RIGHT_RECEIVE, &forward_sigexc))
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__libc_fatal ("hurd: Can't create receive right for signal thread exc\n");
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memset (&state, 0, sizeof state);
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MACHINE_THREAD_STATE_SET_PC (&state, faulted);
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MACHINE_THREAD_STATE_SET_SP (&state, faultstack, sizeof faultstack);
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#if 0 /* Don't confuse gdb. */
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__thread_set_special_port (_hurd_msgport_thread,
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THREAD_EXCEPTION_PORT, sigexc);
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#endif
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if (err = __USEPORT
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(PROC,
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__proc_handle_exceptions (port,
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sigexc,
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forward_sigexc, MACH_MSG_TYPE_MAKE_SEND,
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MACHINE_THREAD_STATE_FLAVOR,
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(natural_t *) &state,
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MACHINE_THREAD_STATE_COUNT)))
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__libc_fatal ("hurd: proc won't handle signal thread exceptions\n");
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}
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