| 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 */ |