1 /* Copyright (C) 1994,95,96,97,2002 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Lesser General Public
6 License as published by the Free Software Foundation; either
7 version 2.1 of the License, or (at your option) any later version.
9 The GNU C Library is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 Lesser General Public License for more details.
14 You should have received a copy of the GNU Lesser General Public
15 License along with the GNU C Library; if not, write to the Free
16 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
19 #include <mach/exc_server.h>
20 #include <hurd/signal.h>
22 /* Called by the microkernel when a thread gets an exception. */
25 _S_catch_exception_raise (mach_port_t port,
28 #ifdef EXC_MASK_ALL /* New interface flavor. */
29 exception_type_t exception,
30 exception_data_t code,
31 mach_msg_type_number_t codeCnt
32 #else /* Vanilla Mach 3.0 interface. */
33 int exception, int code, int subcode
37 struct hurd_sigstate *ss;
39 struct hurd_signal_detail d;
41 if (task != __mach_task_self ())
42 /* The sender wasn't the kernel. */
47 assert (codeCnt >= 2);
49 d.exc_subcode = code[1];
52 d.exc_subcode = subcode;
55 /* Call the machine-dependent function to translate the Mach exception
56 codes into a signal number and subcode. */
57 _hurd_exception2signal (&d, &signo);
59 /* Find the sigstate structure for the faulting thread. */
60 __mutex_lock (&_hurd_siglock);
61 for (ss = _hurd_sigstates; ss != NULL; ss = ss->next)
62 if (ss->thread == thread)
64 __mutex_unlock (&_hurd_siglock);
66 ss = _hurd_thread_sigstate (thread); /* Allocate a fresh one. */
68 if (__spin_lock_locked (&ss->lock))
70 /* Loser. The thread faulted with its sigstate lock held. Its
71 sigstate data is now suspect. So we reset the parts of it which
72 could cause trouble for the signal thread. Anything else
73 clobbered therein will just hose this user thread, but it's
76 This is almost certainly a library bug: unless random memory
77 clobberation caused the sigstate lock to gratuitously appear held,
78 no code should do anything that can fault while holding the
81 __spin_unlock (&ss->critical_section_lock);
83 __spin_unlock (&ss->lock);
86 /* Post the signal. */
87 _hurd_internal_post_signal (ss, signo, &d,
88 MACH_PORT_NULL, MACH_MSG_TYPE_PORT_SEND,
95 /* XXX New interface flavor has additional RPCs that we could be using
96 instead. These RPCs roll a thread_get_state/thread_set_state into
97 the message, so the signal thread ought to use these to save some calls.
100 _S_catch_exception_raise_state (mach_port_t port,
101 exception_type_t exception,
102 exception_data_t code,
103 mach_msg_type_number_t codeCnt,
105 thread_state_t old_state,
106 mach_msg_type_number_t old_stateCnt,
107 thread_state_t new_state,
108 mach_msg_type_number_t *new_stateCnt)
115 _S_catch_exception_raise_state_identity (mach_port_t exception_port,
118 exception_type_t exception,
119 exception_data_t code,
120 mach_msg_type_number_t codeCnt,
122 thread_state_t old_state,
123 mach_msg_type_number_t old_stateCnt,
124 thread_state_t new_state,
125 mach_msg_type_number_t *new_stateCnt)