memmap.cpp

ecos实时嵌入式操作系统

        mem_section_view new_section_view;
        new_section_view.section = additional_section;
        new_section_view.section_location = location_type;
        region->section_view_list.insert (insertion_point, new_section_view);
    }

    return true;
}


////////////////////////////////////////////////////////////////////
// absolute_sections_meet() determines whether the specified
// absolute memory sections meet. It assumes that section2 comes
// after section1 in the memory map.

bool mem_map::absolute_sections_meet(list <mem_section>::iterator section1, list <mem_section>::iterator section2)
{
    if (section1->size == 0) // size of section1 is unknown
        return false;

    // check if initial section locations meet

    if ((section1->initial_location->anchor == absolute) && 
        ((section2->initial_location->anchor == absolute) &&
        section1->initial_location->address + section1->size == section2->initial_location->address))
        return true;

    // check if final section locations meet

    if ((section1->final_location->anchor == absolute) && 
        ((section2->final_location->anchor == absolute) &&
        section1->final_location->address + section1->size == section2->final_location->address))
        return true;

    return false;
}


//////////////////////////////////////////////////////////////
// at_start_of_region() determines whether the specified section
// is located at the very start of the specified region

bool mem_map::at_start_of_region (list <mem_section>::iterator section, list <mem_region>::iterator region)
{
    // check initial section location
    
    if ((section->initial_location->anchor == absolute) &&
        (section->initial_location->address == region->address))
        return true;

    // check final section location
    
    if ((section->final_location->anchor == absolute) &&
        (section->final_location->address == region->address))
        return true;

    return false;
}

//////////////////////////////////////////////////////////////
// at_end_of_region() determines whether the specified section
// is located at the very end of the specified region

bool mem_map::at_end_of_region (list <mem_section>::iterator section, list <mem_region>::iterator region)
{
    if (section->size == 0) // size of section is unknown
        return false;

    // check initial section location
    
    if ((section->initial_location->anchor == absolute) &&
        section->initial_location->address + section->size == region->address + region->size)
        return true;

    // check final section location
    
    if ((section->final_location->anchor == absolute) &&
        section->final_location->address + section->size == region->address + region->size)
        return true;

    return false;
}

////////////////////////////////////////////////////////////////////////
// find_preceding_section() finds the preceding section in the
// memory section list

list <mem_section>::iterator mem_map::find_preceding_section (list <mem_section>::iterator reference_section, bool initial_location)
{
    for (list <mem_section>::iterator section = section_list.begin (); section != section_list.end (); ++section)
    {
        if (reference_section == (reference_section->relocates && initial_location ? section->initial_location->following_section : section->final_location->following_section)) // if preceding section found
            return section; // return the section iterator
    }
    return NULL; // section not found
}

////////////////////////////////////////////////////////////////////////
// find_memory_section() finds an existing section in the
// memory section list

list <mem_section>::iterator mem_map::find_memory_section (std::string section_name)
{
    for (list <mem_section>::iterator section = section_list.begin (); section != section_list.end (); ++section)
        if (section->name == section_name) // if section found
            return section; // return the section iterator

    return NULL; // section not found
}


////////////////////////////////////////////////////////////////////////
// find_memory_region() finds an existing region in the
// memory region list

list <mem_region>::iterator mem_map::find_memory_region (std::string region_name)
{
    for (list <mem_region>::iterator region = region_list.begin (); region != region_list.end (); ++region)
        if (region->name == region_name) // if region found
            return region; // return the region iterator

    return NULL; // region not found
}


////////////////////////////////////////////////////////////////////////
// delete_memory_section() removes an existing item from the
// memory section map

bool mem_map::delete_memory_section (std::string name)
{
    // make sure that the section exists

    list <mem_section>::iterator section = find_memory_section (name);
    if (section == NULL)
        return false; // there is no section with this name

/*
    // make sure that there are no sections defined relative to this section before deleting it

    if (section->initial_location->following_section != NULL)
        return false;

    if (section->final_location->following_section != NULL)
        return false;
*/

    // if section is absolute, copy the initial and final location information to
    // the following sections (if any)

    if ((section->initial_location->anchor == absolute) && (section->initial_location->following_section != NULL))
    {
        section->initial_location->following_section->initial_location->anchor = absolute;
        section->initial_location->following_section->initial_location->address = section->initial_location->address;
        // FIXME adjust new address of following section for alignment here
    }

    if ((section->final_location->anchor == absolute) && (section->final_location->following_section != NULL))
    {
        section->final_location->following_section->final_location->anchor = absolute;
        section->final_location->following_section->final_location->address = section->final_location->address;
        // FIXME adjust new address of following section for alignment here
    }

    // if section is relative, find the initial and final sections to which it is attached
    // and set their pointers to the sections following the one to be deleted (if any)

    list <mem_section>::iterator related_section;

    if (section->initial_location->anchor == relative)
        for (related_section = section_list.begin (); related_section != section_list.end (); ++related_section)
            if (related_section->initial_location->following_section == section)
                related_section->initial_location->following_section = section->initial_location->following_section;

    if (section->final_location->anchor == relative)
        for (related_section = section_list.begin (); related_section != section_list.end (); ++related_section)
            if (related_section->final_location->following_section == section)
                related_section->final_location->following_section = section->final_location->following_section;

    // delete the section

    delete section->initial_location;
    section->initial_location = NULL;

    delete section->final_location;
    section->final_location = NULL;

    section_list.erase (section);

    // recalculate section lists for all regions

    calc_section_lists ();

	map_modified_flag = true;
    return true;
}


////////////////////////////////////////////////////////////////////////
// delete_memory_sections() deletes all memory sections in preparation
// for layout loading or application closure

bool mem_map::delete_all_memory_sections ()
{
    // deleteZ(each section in turn)

    while (section_list.size () > 0)
    {
        list <mem_section>::iterator section = section_list.begin ();
        delete section->initial_location;
        section->initial_location = NULL;

        delete section->final_location;
        section->final_location = NULL;

        section_list.erase (section);
    }
//    section_list.clear ();

    // recalculate section view lists for all regions

    calc_section_lists ();

	map_modified_flag = true;
    return true;
}


////////////////////////////////////////////////////////////////////////
// export_sections() exports section-related info for regions of the
// specified type to the linker script fragment and header file

bool mem_map::export_sections (FILE * script_stream, FILE * header_stream, mem_type type)
{
    for (list <mem_region>::iterator region = region_list.begin (); region != region_list.end(); ++region)
        if (region->type == type)
    {
        for (list <mem_section_view>::iterator section_view = region->section_view_list.begin (); section_view != region->section_view_list.end (); ++section_view)
        {
            if ((section_view->section != NULL) && (section_view->section_location != initial_location))
            {
                if (section_view->section->linker_defined) // section is linker-defined
                {
                    // output section name and region name
                    fprintf (script_stream, "    SECTION_%s (%s, ",
                        encode_section_name (section_view->section->name).c_str (), region->name.c_str ());

                    // output VMA
                    if (section_view->section->final_location->anchor == absolute) // an absolute VMA
                        fprintf (script_stream, "%#lx, ", section_view->section->final_location->address); // specify absolute address
                    else // a relative VMA
                        fprintf (script_stream, "ALIGN (%#lx), ", section_view->section->alignment); // specify alignment

                    // output LMA
                    if (! section_view->section->relocates) // section does not relocate so LMA == VMA
                        fprintf (script_stream, "LMA_EQ_VMA)");
                    else if (section_view->section->initial_location->anchor == absolute) // an absolute LMA
                        fprintf (script_stream, "AT (%#lx))", section_view->section->initial_location->address);
                    else // a relative LMA
                    {
                        list <mem_section>::iterator parent_section;
                        for (parent_section = section_list.begin (); parent_section != section_list.end (); ++parent_section)
                            if (parent_section->initial_location->following_section == section_view->section)
                                break;

                        if (parent_section->linker_defined) // parent section is linker-defined
                            fprintf (script_stream, "FOLLOWING (.%s))", parent_section->name.c_str ());
                        else // parent section is user-defined
                            fprintf (script_stream, "AT (__%s + %#lx))", parent_section->name.c_str (), parent_section->size);
                    }
                }
                else // section is user-defined
                {
                    // output section symbol
                    if (section_view->section->final_location->anchor == absolute) // an absolute VMA
                        fprintf (script_stream, "    CYG_LABEL_DEFN(__%s) = %#lx;", section_view->section->name.c_str (), section_view->section->final_location->address);
                    else // a relative VMA
                        fprintf (script_stream, "    CYG_LABEL_DEFN(__%s) = ALIGN (%#lx);", section_view->section->name.c_str (), section_view->section->alignment);

                    // update current location pointer
                    if (section_view->section->size != 0) // size is known
                        fprintf (script_stream, " . = CYG_LABEL_DEFN(__%s) + %#lx;", section_view->section->name.c_str (), section_view->section->size);

                    // output reference to symbol in header file
                    fprintf (header_stream, "#ifndef __ASSEMBLER__\nextern char CYG_LABEL_NAME (__%s) [];\n#endif\n", section_view->section->name.c_str ());
                    fprintf (header_stream, "#define CYGMEM_SECTION_%s (CYG_LABEL_NAME (__%s))\n", section_view->section->name.c_str (), section_view->section->name.c_str ());
                    if (section_view->section->size == 0) // a section of unknown size
                    {
                        mem_address section_end_address;

                        ++section_view; // move to next section_view
                        if (section_view == region->section_view_list.end ()) // section continues to end of region
                            section_end_address = region->address + region->size;
                        else // section continues to next section with an absolute location
                            section_end_address = section_view->section->final_location->address;
                        --section_view; // move back to previous section view

                        fprintf (header_stream, "#define CYGMEM_SECTION_%s_SIZE (%#lx - (size_t) CYG_LABEL_NAME (__%s))\n", section_view->section->name.c_str (), section_end_address, section_view->section->name.c_str ());
                    }
                    else // a section of known size
                        fprintf (header_stream, "#define CYGMEM_SECTION_%s_SIZE (%#lx)\n", section_view->section->name.c_str (), section_view->section->size);
                }