1 /* Handle faults in the signal thread.
2 Copyright (C) 1994, 1995 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Library General Public License as
7 published by the Free Software Foundation; either version 2 of the
8 License, or (at your option) any later version.
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Library General Public License for more details.
15 You should have received a copy of the GNU Library General Public
16 License along with the GNU C Library; see the file COPYING.LIB. If
17 not, write to the Free Software Foundation, Inc., 675 Mass Ave,
18 Cambridge, MA 02139, USA. */
21 #include <hurd/signal.h>
22 #include "hurdfault.h"
27 #include "thread_state.h"
28 #include "faultexc.h" /* mig-generated header for our exc server. */
31 jmp_buf _hurdsig_fault_env
;
33 static mach_port_t forward_sigexc
;
35 int _hurdsig_fault_expect_signo
;
36 long int _hurdsig_fault_sigcode
;
37 int _hurdsig_fault_sigerror
;
40 _hurdsig_fault_catch_exception_raise (mach_port_t port
,
49 if (port
!= forward_sigexc
||
50 thread
!= _hurd_msgport_thread
|| task
!= __mach_task_self ())
51 return EPERM
; /* Strange bogosity. */
53 /* Call the machine-dependent function to translate the Mach exception
54 codes into a signal number and subcode. */
55 _hurd_exception2signal (exception
, code
, subcode
, &signo
,
56 &_hurdsig_fault_sigcode
, &_hurdsig_fault_sigerror
);
58 return signo
== _hurdsig_fault_expect_signo
? 0 : EGREGIOUS
;
66 mach_msg_header_t head
;
71 mach_msg_header_t head
;
75 extern int _hurdsig_fault_exc_server (mach_msg_header_t
*,
78 /* Wait for the exception_raise message forwarded by the proc server. */
80 if (__mach_msg (&request
.head
, MACH_RCV_MSG
, 0,
81 sizeof request
, forward_sigexc
,
82 MACH_MSG_TIMEOUT_NONE
, MACH_PORT_NULL
)
84 __libc_fatal ("msg receive failed on signal thread exc\n");
86 /* Run the exc demuxer which should call the server function above.
87 That function returns 0 if the exception was expected. */
88 switch (_hurdsig_fault_exc_server (&request
.head
, &reply
.head
))
91 if (reply
.head
.msgh_remote_port
!= MACH_PORT_NULL
)
92 __mach_msg (&reply
.head
, MACH_SEND_MSG
, reply
.head
.msgh_size
,
93 0, MACH_PORT_NULL
, MACH_MSG_TIMEOUT_NONE
, MACH_PORT_NULL
);
96 __mach_msg_destroy (&request
.head
);
100 _hurdsig_fault_expect_signo
= 0;
101 longjmp (_hurdsig_fault_env
, 1);
104 static char faultstack
[1024];
106 /* Send exceptions for the signal thread to the proc server.
107 It will forward the message on to our message port,
108 and then restore the thread's state to code which
109 does `longjmp (_hurd_sigthread_fault_env, 1)'. */
112 _hurdsig_fault_init (void)
115 struct machine_thread_state state
;
118 err
= __mach_port_allocate (__mach_task_self (),
119 MACH_PORT_RIGHT_RECEIVE
, &sigexc
);
121 err
= __mach_port_allocate (__mach_task_self (),
122 MACH_PORT_RIGHT_RECEIVE
, &forward_sigexc
);
125 err
= __mach_port_insert_right (__mach_task_self (), sigexc
,
126 sigexc
, MACH_MSG_TYPE_MAKE_SEND
);
128 err
= __thread_set_special_port (_hurd_msgport_thread
,
129 THREAD_EXCEPTION_PORT
, sigexc
);
130 __mach_port_deallocate (__mach_task_self (), sigexc
);
133 memset (&state
, 0, sizeof state
);
134 MACHINE_THREAD_STATE_SET_PC (&state
, faulted
);
135 MACHINE_THREAD_STATE_SET_SP (&state
, faultstack
, sizeof faultstack
);
139 __proc_handle_exceptions (port
,
141 forward_sigexc
, MACH_MSG_TYPE_MAKE_SEND
,
142 MACHINE_THREAD_STATE_FLAVOR
,
143 (natural_t
*) &state
,
144 MACHINE_THREAD_STATE_COUNT
));