forked from Imagelibrary/rtems
119 lines
3.4 KiB
C
119 lines
3.4 KiB
C
/* SPDX-License-Identifier: BSD-2-Clause */
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/**
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* @file
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*
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* @ingroup rtl
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*
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* @brief RTEMS Module Loading Debugger Interface.
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*
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* Inspection of run-time linkers in NetBSD and Android show a common type of
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* structure that is used to interface to GDB. The NetBSD definition of this
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* interface is being used and is defined in <link.h>. It defines a protocol
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* that is used by GDB to inspect the state of dynamic libraries. I have not
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* checked GDB code at when writing this comment but I suspect GDB sets a break
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* point on the r_brk field of _rtld_debug and it has code that detects this
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* break point being hit. When this happens it reads the state and performs the
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* operation based on the r_state field.
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*/
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/*
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* COPYRIGHT (c) 2012, 2018 Chris Johns <chrisj@rtems.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <stdio.h>
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#include <link.h>
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#include <rtems/rtl/rtl.h>
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#include <rtems/rtl/rtl-trace.h>
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#include <rtems/rtl/rtl-obj-fwd.h>
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struct r_debug _rtld_debug;
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void
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_rtld_debug_state (void)
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{
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/*
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* Empty. GDB only needs to hit this location.
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*/
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}
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int
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_rtld_linkmap_add (rtems_rtl_obj* obj)
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{
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struct link_map* l = obj->linkmap;
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struct link_map* prev;
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uint32_t obj_num = obj->obj_num;
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int i;
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if (rtems_rtl_trace (RTEMS_RTL_TRACE_DETAIL))
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printf ("rtl: linkmap_add\n");
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for (i = 0; i < obj_num; ++i)
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{
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l[i].sec_addr[rap_text] = obj->text_base;
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l[i].sec_addr[rap_const] = obj->const_base;
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l[i].sec_addr[rap_data] = obj->data_base;
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l[i].sec_addr[rap_bss] = obj->bss_base;
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}
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if (_rtld_debug.r_map == NULL)
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{
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_rtld_debug.r_map = l;
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}
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else
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{
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for (prev = _rtld_debug.r_map; prev->l_next != NULL; prev = prev->l_next);
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l->l_prev = prev;
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prev->l_next = l;
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}
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return true;
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}
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void
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_rtld_linkmap_delete (rtems_rtl_obj* obj)
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{
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struct link_map* l = obj->linkmap;
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/*
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* link_maps are allocated together if not 1
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*/
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struct link_map* e = l + obj->obj_num - 1;
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if (l->l_prev == NULL)
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{
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if ((_rtld_debug.r_map = e->l_next) != NULL)
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_rtld_debug.r_map->l_prev = NULL;
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}
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else
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{
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if ((l->l_prev->l_next = e->l_next) != NULL)
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e->l_next->l_prev = l->l_prev;
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}
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}
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