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