cpukit/libdl/rtl-unwind-dw2.c

0001 /* SPDX-License-Identifier: BSD-2-Clause */
0002
0003 /**
0004  * @file
0005  *
0006  * @ingroup rtems_rtld
0007  *
0008  * @brief RTEMS Run-Time Link Editor
0009  *
0010  * This is the RTL implementation.
0011  */
0012
0013 /*
0014  *  COPYRIGHT (c) 2012-2016, 2018 Chris Johns <chrisj@rtems.org>
0015  *
0016  * Redistribution and use in source and binary forms, with or without
0017  * modification, are permitted provided that the following conditions
0018  * are met:
0019  * 1. Redistributions of source code must retain the above copyright
0020  *    notice, this list of conditions and the following disclaimer.
0021  * 2. Redistributions in binary form must reproduce the above copyright
0022  *    notice, this list of conditions and the following disclaimer in the
0023  *    documentation and/or other materials provided with the distribution.
0024  *
0025  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
0026  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
0027  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
0028  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
0029  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
0030  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
0031  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
0032  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
0033  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
0034  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
0035  * POSSIBILITY OF SUCH DAMAGE.
0036  */
0037
0038 #ifdef HAVE_CONFIG_H
0039 #include "config.h"
0040 #endif
0041
0042 #include <string.h>
0043 #include <stdio.h>
0044
0045 #include <rtems/rtl/rtl.h>
0046 #include "rtl-elf.h"
0047 #include "rtl-error.h"
0048 #include "rtl-unwind.h"
0049 #include "rtl-unwind-dw2.h"
0050
0051 /*
0052  * These interfaces are not exported outside the GCC source.
0053  */
0054 void __register_frame (void *begin);
0055 void __deregister_frame (void *begin);
0056
0057 bool
0058 rtems_rtl_elf_unwind_dw2_parse (const rtems_rtl_obj* obj,
0059                                 const char*          name,
0060                                 uint32_t             flags)
0061 {
0062   return
0063     ((flags & RTEMS_RTL_OBJ_SECT_CONST) != 0) &&
0064     ((strcmp(name, ".eh_frame") == 0) ||
0065      (strncmp(name, ".gcc_except_table.", sizeof (".gcc_except_table.") - 1) == 0));
0066 }
0067
0068 bool
0069 rtems_rtl_elf_unwind_dw2_register (const rtems_rtl_obj* obj)
0070 {
0071   rtems_rtl_obj_sect* sect = rtems_rtl_obj_find_section (obj, ".eh_frame");
0072
0073   if (sect != NULL && sect->size > 0 && sect->base != NULL)
0074   {
0075     __register_frame (sect->base);
0076   }
0077
0078   return true;
0079 }
0080
0081 bool rtems_rtl_elf_unwind_dw2_deregister (const rtems_rtl_obj* obj)
0082 {
0083   rtems_rtl_obj_sect* sect = rtems_rtl_obj_find_section (obj, ".eh_frame");
0084
0085   if (sect != NULL && sect->size > 0 && sect->base != NULL)
0086   {
0087     __deregister_frame (sect->base);
0088   }
0089
0090   return true;
0091 }