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434897ee MD |
1 | /* |
2 | * Copyright (C) 2020 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com> | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify | |
5 | * it under the terms of the GNU General Public License as published by | |
6 | * the Free Software Foundation; version 2 of the License only. | |
7 | * | |
8 | * This program is distributed in the hope that it will be useful, | |
9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
11 | * GNU General Public License for more details. | |
12 | * | |
13 | * You should have received a copy of the GNU General Public License along | |
14 | * with this program; if not, write to the Free Software Foundation, Inc., | |
15 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
16 | */ | |
17 | ||
18 | #ifndef _LTTNG_UST_SIGBUS_H | |
19 | #define _LTTNG_UST_SIGBUS_H | |
20 | ||
21 | #include <urcu/list.h> | |
22 | #include <setjmp.h> | |
23 | ||
24 | struct lttng_ust_sigbus_range { | |
25 | void *start; /* inclusive */ | |
26 | void *end; /* exclusive */ | |
27 | struct cds_list_head node; | |
28 | }; | |
29 | ||
30 | struct lttng_ust_sigbus_state { | |
31 | int jmp_ready; | |
32 | struct cds_list_head head; /* struct lttng_ust_sigbus_range */ | |
33 | sigjmp_buf sj_env; | |
34 | }; | |
35 | ||
36 | /* | |
37 | * Define the lttng_ust_sigbus_state TLS variable as initial-exec model | |
38 | * to allow using it from the SIGBUS signal handler. This variable must | |
39 | * be defined by the executable using DEFINE_LTTNG_UST_SIGBUS_STATE() | |
40 | * rather than internally within liblttng-ust-ctl.so to ensure we don't | |
41 | * contribute to reach glibc limits of pre-allocated TLS IE model space | |
42 | * for shared objects. | |
43 | */ | |
44 | #define DEFINE_LTTNG_UST_SIGBUS_STATE() \ | |
45 | __thread __attribute__((tls_model("initial-exec"))) struct lttng_ust_sigbus_state lttng_ust_sigbus_state | |
46 | ||
47 | extern __thread __attribute__((tls_model("initial-exec"))) struct lttng_ust_sigbus_state lttng_ust_sigbus_state; | |
48 | ||
49 | #endif /* _LTTNG_UST_SIGBUS_H */ |