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bfff8b1b | 1 | /* Copyright (C) 1994-2017 Free Software Foundation, Inc. |
c84142e8 UD |
2 | This file is part of the GNU C Library. |
3 | ||
4 | The GNU C Library is free software; you can redistribute it and/or | |
41bdb6e2 AJ |
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. | |
c84142e8 UD |
8 | |
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 | |
41bdb6e2 | 12 | Lesser General Public License for more details. |
c84142e8 | 13 | |
41bdb6e2 | 14 | You should have received a copy of the GNU Lesser General Public |
59ba27a6 PE |
15 | License along with the GNU C Library; if not, see |
16 | <http://www.gnu.org/licenses/>. */ | |
28f540f4 RM |
17 | |
18 | #include <mach/exc_server.h> | |
19 | #include <hurd/signal.h> | |
21297437 | 20 | #include <assert.h> |
28f540f4 RM |
21 | |
22 | /* Called by the microkernel when a thread gets an exception. */ | |
23 | ||
24 | kern_return_t | |
25 | _S_catch_exception_raise (mach_port_t port, | |
26 | thread_t thread, | |
27 | task_t task, | |
f22a77e1 RM |
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. */ | |
14906e37 RM |
33 | integer_t exception, |
34 | integer_t code, integer_t subcode | |
f22a77e1 RM |
35 | #endif |
36 | ) | |
28f540f4 | 37 | { |
28f540f4 | 38 | struct hurd_sigstate *ss; |
0e3426bb RM |
39 | int signo; |
40 | struct hurd_signal_detail d; | |
28f540f4 RM |
41 | |
42 | if (task != __mach_task_self ()) | |
43 | /* The sender wasn't the kernel. */ | |
44 | return EPERM; | |
45 | ||
0e3426bb | 46 | d.exc = exception; |
f22a77e1 RM |
47 | #ifdef EXC_MASK_ALL |
48 | assert (codeCnt >= 2); | |
49 | d.exc_code = code[0]; | |
50 | d.exc_subcode = code[1]; | |
51 | #else | |
0e3426bb RM |
52 | d.exc_code = code; |
53 | d.exc_subcode = subcode; | |
f22a77e1 | 54 | #endif |
0e3426bb | 55 | |
28f540f4 RM |
56 | /* Call the machine-dependent function to translate the Mach exception |
57 | codes into a signal number and subcode. */ | |
0e3426bb | 58 | _hurd_exception2signal (&d, &signo); |
28f540f4 RM |
59 | |
60 | /* Find the sigstate structure for the faulting thread. */ | |
61 | __mutex_lock (&_hurd_siglock); | |
62 | for (ss = _hurd_sigstates; ss != NULL; ss = ss->next) | |
63 | if (ss->thread == thread) | |
64 | break; | |
65 | __mutex_unlock (&_hurd_siglock); | |
66 | if (ss == NULL) | |
67 | ss = _hurd_thread_sigstate (thread); /* Allocate a fresh one. */ | |
68 | ||
69 | if (__spin_lock_locked (&ss->lock)) | |
70 | { | |
71 | /* Loser. The thread faulted with its sigstate lock held. Its | |
72 | sigstate data is now suspect. So we reset the parts of it which | |
73 | could cause trouble for the signal thread. Anything else | |
74 | clobbered therein will just hose this user thread, but it's | |
75 | faulting already. | |
76 | ||
77 | This is almost certainly a library bug: unless random memory | |
78 | clobberation caused the sigstate lock to gratuitously appear held, | |
79 | no code should do anything that can fault while holding the | |
80 | sigstate lock. */ | |
81 | ||
8f0c527e | 82 | __spin_unlock (&ss->critical_section_lock); |
28f540f4 RM |
83 | ss->context = NULL; |
84 | __spin_unlock (&ss->lock); | |
85 | } | |
86 | ||
87 | /* Post the signal. */ | |
0e3426bb | 88 | _hurd_internal_post_signal (ss, signo, &d, |
28f540f4 RM |
89 | MACH_PORT_NULL, MACH_MSG_TYPE_PORT_SEND, |
90 | 0); | |
91 | ||
92 | return KERN_SUCCESS; | |
93 | } | |
f22a77e1 RM |
94 | |
95 | #ifdef EXC_MASK_ALL | |
96 | /* XXX New interface flavor has additional RPCs that we could be using | |
97 | instead. These RPCs roll a thread_get_state/thread_set_state into | |
98 | the message, so the signal thread ought to use these to save some calls. | |
99 | */ | |
100 | kern_return_t | |
101 | _S_catch_exception_raise_state (mach_port_t port, | |
102 | exception_type_t exception, | |
103 | exception_data_t code, | |
104 | mach_msg_type_number_t codeCnt, | |
105 | int *flavor, | |
106 | thread_state_t old_state, | |
107 | mach_msg_type_number_t old_stateCnt, | |
108 | thread_state_t new_state, | |
109 | mach_msg_type_number_t *new_stateCnt) | |
110 | { | |
111 | abort (); | |
112 | return KERN_FAILURE; | |
113 | } | |
114 | ||
115 | kern_return_t | |
116 | _S_catch_exception_raise_state_identity (mach_port_t exception_port, | |
117 | thread_t thread, | |
118 | task_t task, | |
119 | exception_type_t exception, | |
120 | exception_data_t code, | |
121 | mach_msg_type_number_t codeCnt, | |
122 | int *flavor, | |
123 | thread_state_t old_state, | |
124 | mach_msg_type_number_t old_stateCnt, | |
125 | thread_state_t new_state, | |
126 | mach_msg_type_number_t *new_stateCnt) | |
127 | { | |
128 | abort (); | |
129 | return KERN_FAILURE; | |
130 | } | |
131 | #endif |