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rld-rap.cpp
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/*
* Copyright (c) 2012, Chris Johns <[email protected]>
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
/**
* @file
*
* @ingroup rtems_ld
*
* @brief RTEMS Linker.
*
* @todo Set the RAP alignment as the max of all alignments.
*/
#if HAVE_CONFIG_H
#include "config.h"
#endif
#include <string.h>
#include <algorithm>
#include <list>
#include <iomanip>
#include <rld.h>
#include <rld-compression.h>
#include <rld-rap.h>
namespace rld
{
namespace rap
{
/**
* Output details or not.
*/
bool add_obj_details = true;
/**
* Store the path of object files.
*/
std::string rpath;
/**
* The names of the RAP sections.
*/
static const char* section_names[rap_secs] =
{
".text",
".const",
".ctor",
".dtor",
".data",
".bss"
};
/**
* RAP relocation record. This one does not have const fields.
*/
struct relocation
{
uint32_t offset; //< The offset in the section to apply the fixup.
uint32_t info; //< The ELF info record.
uint32_t addend; //< The ELF constant addend.
std::string symname; //< The symbol name if there is one.
uint32_t symtype; //< The type of symbol.
int symsect; //< The symbol's RAP section.
uint32_t symvalue; //< The symbol's default value.
uint32_t symbinding;//< The symbol's binding.
/**
* Construct the relocation using the file relocation, the offset of the
* section in the target RAP section and the RAP section of the symbol.
*/
relocation (const files::relocation& reloc, const uint32_t offset);
};
/**
* Relocation records.
*/
typedef std::vector < relocation > relocations;
/**
* Relocation symname sorter for the relocations container.
*/
class reloc_symname_compare
{
public:
bool operator () (const relocation& lhs,
const relocation& rhs) const {
return lhs.symname < rhs.symname;
}
};
/**
* Relocation offset sorter for the relocations container.
*/
class reloc_offset_compare
{
public:
bool operator () (const relocation& lhs,
const relocation& rhs) const {
if (lhs.symname == rhs.symname)
return lhs.offset < rhs.offset;
else return false;
}
};
/**
* An object section's offset, size and alignment.
*/
struct osection
{
std::string name; //< The name of the section.
uint32_t offset; //< The offset in the object file.
uint32_t size; //< The size of this section.
uint32_t align; //< The alignment.
uint32_t relocs; //< The number of relocations.
uint64_t flags; //< The flags.
/**
* Construct the object section.
*/
osection (const std::string& name,
uint32_t offset,
uint32_t size,
uint32_t align,
uint32_t relocs,
uint64_t flags);
/**
* Default constructor.
*/
osection ();
};
/**
* Map of object file section offsets keyed by the object file section
* index. This is used when adding the external symbols so the symbol's
* value can be adjusted by the offset of the section in the RAP section.
*/
typedef std::map < const int, osection > osections;
/**
* An ordered container of object section indexes. We need the same
* order so the alignments match up with the layout.
*/
typedef std::vector < int > osecindexes;
/**
* Section detail will be written into RAP file
*/
struct section_detail
{
uint32_t name; //< The offset in the strtable.
uint32_t offset; //< The offset in the rap section.
uint32_t id; //< The rap id.
uint32_t size; //< The size of the section.
/* Constructor */
section_detail (uint32_t name, uint32_t offset, uint32_t id, uint32_t size);
};
/*
* A container of section detail
*/
typedef std::list < section_detail > section_details;
/**
* The RAP section data.
*/
struct section
{
std::string name; //< The name of the section.
uint32_t offset; //< The offset of the section.
bool rela; //< The relocation record has an addend field.
relocations relocs; //< The relocations for this section.
osections osecs; //< The object section index.
osecindexes osindexes; //< The object section indexes in order.
/**
* Default constructor.
*/
section ();
/**
* Clear the section.
*/
void clear ();
/**
* The size of the section given the offset.
*/
uint32_t size (uint32_t offset = 0) const;
/**
* The alignment of the first section.
*/
uint32_t alignment () const;
/**
* The alignment of the object section given its index.
*/
uint32_t alignment (int index) const;
/**
* Set the offset of this section based on the previous section.
*/
void set_offset (const section& sec);
/**
* Return the object section given the index.
*/
const osection& get_osection (int index) const;
/**
* Output helper function to report the sections in an object file. This
* is useful when seeing the flags in the sections.
*/
void output ();
};
/**
* A symbol. This matches the symbol structure 'rtems_rtl_obj_sym_t' in the
* target code.
*/
struct external
{
/**
* Size of an external in the RAP file.
*/
static const uint32_t rap_size = sizeof (uint32_t) * 3;
const uint32_t name; //< The string table's name index.
const sections sec; //< The section the symbols belongs to.
const uint32_t value; //< The offset from the section base.
const uint32_t data; //< The ELF st.info field.
/**
* The constructor.
*/
external (const uint32_t name,
const sections sec,
const uint32_t value,
const uint32_t data);
/**
* Copy constructor.
*/
external (const external& orig);
};
/**
* A container of externals.
*/
typedef std::list < external > externals;
/**
* The specific data for each object we need to collect to create the RAP
* format file.
*/
struct object
{
files::object& obj; //< The object file.
files::sections text; //< All executable code.
files::sections const_; //< All read only data.
files::sections ctor; //< The static constructor table.
files::sections dtor; //< The static destructor table.
files::sections data; //< All initialised read/write data.
files::sections bss; //< All uninitialised read/write data
files::sections symtab; //< All exported symbols.
files::sections strtab; //< All exported strings.
section secs[rap_secs]; //< The sections of interest.
/**
* The constructor. Need to have an object file to create.
*/
object (files::object& obj);
/**
* The copy constructor.
*/
object (const object& orig);
/**
* Find the section type that matches the section index.
*/
sections find (const uint32_t index) const;
/**
* The total number of relocations in the object file.
*/
uint32_t get_relocations () const;
/**
* The total number of relocations for a specific RAP section in the
* object file.
*/
uint32_t get_relocations (int sec) const;
/**
* Output the object file details..
*/
void output ();
private:
/**
* No default constructor allowed.
*/
object ();
};
/**
* A container of objects.
*/
typedef std::list < object > objects;
/**
* The RAP image.
*/
class image
{
public:
/**
* Construct the image.
*/
image ();
/**
* Load the layout data from the object files.
*
* @param app_objects The object files in the application.
* @param init The initialisation entry point label.
* @param fini The finish entry point label.
*/
void layout (const files::object_list& app_objects,
const std::string& init,
const std::string& fini);
/**
* Collection the symbols from the object file.
*
* @param obj The object file to collection the symbol from.
*/
void collect_symbols (object& obj);
/**
* Write the compressed output file. This is the top level write
* interface.
*
* @param comp The compressor.
*/
void write (compress::compressor& comp);
/**
* Write the RAP section to the compressed output file given the object files.
* Check to make sure the size in the layout and the size written match.
*
* @param comp The compressor.
* @param sec The RAP setion to write.
*/
void write (compress::compressor& comp, sections sec);
/**
* Write the sections to the compressed output file. The file sections
* are used to ensure the alignment. The offset is used to ensure the
* alignment of the first section of the object when it is written.
*
* @param comp The compressor.
* @param obj The object file the sections are part of.
* @param secs The container of file sections to write.
* @param offset The current offset in the RAP section.
*/
void write (compress::compressor& comp,
files::object& obj,
const files::sections& secs,
uint32_t& offset);
/**
* Write the external symbols.
*/
void write_externals (compress::compressor& comp);
/**
* Write the relocation records for all the object files.
*/
void write_relocations (compress::compressor& comp);
/**
* Write the details of the files.
*/
void write_details (compress::compressor& comp);
/**
* The total number of relocations for a specific RAP section in the
* image.
*/
uint32_t get_relocations (int sec) const;
/**
* Clear the image values.
*/
void clear ();
/**
* Report the RAP section's size.
*/
uint32_t section_size (sections sec) const;
/**
* Find a symbol name in the string table.
*/
std::size_t find_in_strtab (const std::string& symname);
private:
objects objs; //< The RAP objects
uint32_t sec_size[rap_secs]; //< The sections of interest.
uint32_t sec_align[rap_secs]; //< The sections of interest.
bool sec_rela[rap_secs]; //< The sections of interest.
externals externs; //< The symbols in the image
uint32_t symtab_size; //< The size of the symbols.
std::string strtab; //< The strings table.
uint32_t relocs_size; //< The relocations size.
uint32_t init_off; //< The strtab offset to the init label.
uint32_t fini_off; //< The strtab offset to the fini label.
};
const char*
section_name (int sec)
{
if (sec < rap_secs)
return section_names[sec];
throw rld::error ("Invalid section '" + rld::to_string (sec) + "'",
"rap::section-name");
}
/**
* Update the offset taking into account the alignment.
*
* @param offset The current offset.
* @param size The size to move the offset by.
* @param alignment The alignment of the offset.
* @return uint32_t The new aligned offset.
*/
uint32_t align_offset (uint32_t offset, uint32_t size, uint32_t alignment)
{
offset += size;
if (alignment > 1)
{
uint32_t mask = alignment - 1;
if (offset & mask)
{
offset &= ~mask;
offset += alignment;
}
}
return offset;
}
relocation::relocation (const files::relocation& reloc,
const uint32_t offset)
: offset (reloc.offset + offset),
info (reloc.info),
addend (reloc.addend),
symname (reloc.symname),
symtype (reloc.symtype),
symsect (reloc.symsect),
symvalue (reloc.symvalue),
symbinding (reloc.symbinding)
{
}
section_detail::section_detail (uint32_t name,
uint32_t offset,
uint32_t id,
uint32_t size)
: name (name),
offset (offset),
id (id),
size (size)
{
}
osection::osection (const std::string& name,
uint32_t offset,
uint32_t size,
uint32_t align,
uint32_t relocs,
uint64_t flags)
: name (name),
offset (offset),
size (size),
align (align),
relocs (relocs),
flags (flags)
{
}
osection::osection ()
: offset (0),
size (0),
align (0),
relocs (0),
flags (0)
{
}
section::section ()
: offset (0),
rela (false)
{
}
void
section::clear ()
{
offset = 0;
rela = false;
}
uint32_t
section::size (uint32_t offset_) const
{
uint32_t end = offset_;
if (end == 0)
end = offset;
for (size_t si = 0; si < osindexes.size (); ++si)
{
const osection& osec = get_osection (osindexes[si]);
end = align_offset (end, 0, osec.align);
end += osec.size;
}
return end - offset;
}
uint32_t
section::alignment () const
{
if (!osindexes.empty ())
{
const osection& osec = get_osection (osindexes[0]);
return osec.align;
}
return 0;
}
uint32_t
section::alignment (int index) const
{
const osection& osec = get_osection (index);
return osec.align;
}
void
section::set_offset (const section& sec)
{
uint32_t align = alignment ();
offset = align_offset (sec.offset, sec.size (), align);
if (rld::verbose () >= RLD_VERBOSE_FULL_DEBUG)
std::cout << "rap:section::set-offset: " << name
<< " offset=" << offset
<< " size=" << size ()
<< " align=" << align
<< " sec.offset=" << sec.offset
<< " sec.size=" << sec.size (sec.offset)
<< std::endl;
}
const osection&
section::get_osection (int index) const
{
osections::const_iterator osi = osecs.find (index);
if (osi == osecs.end ())
throw rld::error ("Invalid object seciton index in '" + name +"': index=" +
rld::to_string (index),
"rap::section");
return (*osi).second;
}
/**
* Output helper function to report the sections in an object file. This is
* useful when seeing the flags in the sections.
*/
void
section::output ()
{
if (!osindexes.empty ())
{
std::cout << ' ' << name
<< ": size: " << size (offset)
<< " offset: " << offset
<< " rela: " << (rela ? "yes" : "no")
<< std::endl;
for (osecindexes::const_iterator osi = osindexes.begin ();
osi != osindexes.end ();
++osi)
{
const osection& osec = get_osection (*osi);
if (osec.size)
{
#define SF(f, i, c) if (osec.flags & (f)) flags[i] = c
std::string flags ("--------------");
SF (SHF_WRITE, 0, 'W');
SF (SHF_ALLOC, 1, 'A');
SF (SHF_EXECINSTR, 2, 'E');
SF (SHF_MERGE, 3, 'M');
SF (SHF_STRINGS, 4, 'S');
SF (SHF_INFO_LINK, 5, 'I');
SF (SHF_LINK_ORDER, 6, 'L');
SF (SHF_OS_NONCONFORMING, 7, 'N');
SF (SHF_GROUP, 8, 'G');
SF (SHF_TLS, 9, 'T');
SF (SHF_AMD64_LARGE, 10, 'a');
SF (SHF_ENTRYSECT, 11, 'e');
SF (SHF_COMDEF, 12, 'c');
SF (SHF_ORDERED, 13, 'O');
std::cout << " " << std::left
<< std::setw (15) << osec.name
<< " " << flags
<< " size: " << std::setw (5) << osec.size
<< " align: " << std::setw (3) << osec.align
<< " relocs: " << std::setw (4) << osec.relocs
<< " offset: " << std::setw (5) << osec.offset
<< std::hex
<< " image: 0x" << offset + osec.offset
<< std::dec << std::right << std::endl;
}
}
}
}
/**
* Helper for for_each to merge the related object sections into the RAP
* section.
*/
class section_merge:
public std::unary_function < const files::section, void >
{
public:
section_merge (object& obj, section& sec);
~section_merge ();
void operator () (const files::section& fsec);
private:
object& obj;
section& sec;
};
section_merge::section_merge (object& obj, section& sec)
: obj (obj),
sec (sec)
{
sec.offset = 0;
sec.rela = false;
}
section_merge::~section_merge ()
{
if (rld::verbose () >= RLD_VERBOSE_FULL_DEBUG)
std::cout << "rap:section-merge: " << sec.name
<< " size=" << sec.size ()
<< " offset=" << sec.offset
<< " " << obj.obj.name ().full () << std::endl;
}
void
section_merge::operator () (const files::section& fsec)
{
/*
* Align the size up to the next alignment boundary and use that as the
* offset for this object file section.
*/
uint32_t offset = align_offset (sec.size (), 0, fsec.alignment);
if (rld::verbose () >= RLD_VERBOSE_FULL_DEBUG)
std::cout << "rap:section-merge: " << fsec.name
<< " sec-size=" << sec.size ()
<< " relocs=" << fsec.relocs.size ()
<< " offset=" << offset
<< " fsec.size=" << fsec.size
<< " fsec.alignment=" << fsec.alignment
<< " fsec.rela=" << fsec.rela
<< " " << obj.obj.name ().full () << std::endl;
/*
* Add the object file's section offset to the map. This is needed
* to adjust the external symbol offsets.
*/
osection osec (fsec.name,
offset,
fsec.size,
fsec.alignment,
fsec.relocs.size (),
fsec.flags);
sec.osecs[fsec.index] = osec;
sec.osindexes.push_back (fsec.index);
uint32_t rc = 0;
for (files::relocations::const_iterator fri = fsec.relocs.begin ();
fri != fsec.relocs.end ();
++fri, ++rc)
{
const files::relocation& freloc = *fri;
if (rld::verbose () >= RLD_VERBOSE_FULL_DEBUG)
std::cout << " " << std::setw (2) << sec.relocs.size ()
<< '/' << std::setw (2) << rc
<< std::hex << ": reloc.info=0x" << freloc.info << std::dec
<< " reloc.offset=" << freloc.offset
<< " reloc.addend=" << freloc.addend
<< " reloc.symtype=" << freloc.symtype
<< " reloc.symsect=" << freloc.symsect
<< " reloc.symbinding=" << freloc.symbinding
<< std::endl;
sec.relocs.push_back (relocation (freloc, offset));
}
std::stable_sort (sec.relocs.begin (),
sec.relocs.end (),
reloc_symname_compare ());
std::stable_sort (sec.relocs.begin (),
sec.relocs.end (),
reloc_offset_compare ());
if (fsec.rela == true)
sec.rela = fsec.rela;
}
external::external (const uint32_t name,
const sections sec,
const uint32_t value,
const uint32_t data)
: name (name),
sec (sec),
value (value),
data (data)
{
}
external::external (const external& orig)
: name (orig.name),
sec (orig.sec),
value (orig.value),
data (orig.data)
{
}
object::object (files::object& obj)
: obj (obj)
{
/*
* Set up the names of the sections.
*/
for (int s = 0; s < rap_secs; ++s)
secs[s].name = section_names[s];
/*
* Get the relocation records. Collect the various section types from the
* object file into the RAP sections. Merge those sections into the RAP
* sections.
*/
obj.open ();
try
{
obj.begin ();
obj.load_relocations ();
obj.end ();
}
catch (...)
{
obj.close ();
throw;
}
obj.close ();
obj.get_sections (text, SHT_PROGBITS, SHF_ALLOC | SHF_EXECINSTR);
obj.get_sections (const_, SHT_PROGBITS, SHF_ALLOC, SHF_WRITE | SHF_EXECINSTR);
obj.get_sections (ctor, ".ctors");
obj.get_sections (dtor, ".dtors");
obj.get_sections (data, SHT_PROGBITS, SHF_ALLOC | SHF_WRITE);
obj.get_sections (bss, SHT_NOBITS, SHF_ALLOC | SHF_WRITE);
obj.get_sections (symtab, SHT_SYMTAB);
obj.get_sections (strtab, ".strtab");
std::for_each (text.begin (), text.end (),
section_merge (*this, secs[rap_text]));
std::for_each (const_.begin (), const_.end (),
section_merge (*this, secs[rap_const]));
std::for_each (ctor.begin (), ctor.end (),
section_merge (*this, secs[rap_ctor]));
std::for_each (dtor.begin (), dtor.end (),
section_merge (*this, secs[rap_dtor]));
std::for_each (data.begin (), data.end (),
section_merge (*this, secs[rap_data]));
std::for_each (bss.begin (), bss.end (),
section_merge (*this, secs[rap_bss]));
}
object::object (const object& orig)
: obj (orig.obj),
text (orig.text),
const_ (orig.const_),
ctor (orig.ctor),
dtor (orig.dtor),
data (orig.data),
bss (orig.bss),
symtab (orig.symtab),
strtab (orig.strtab)
{
for (int s = 0; s < rap_secs; ++s)
secs[s] = orig.secs[s];
}
sections
object::find (const uint32_t index) const
{
const files::section* sec;
sec = files::find (text, index);
if (sec)
return rap_text;
sec = files::find (const_, index);
if (sec)
return rap_const;
sec = files::find (ctor, index);
if (sec)
return rap_ctor;
sec = files::find (dtor, index);
if (sec)
return rap_dtor;
sec = files::find (data, index);
if (sec)
return rap_data;
sec = files::find (bss, index);
if (sec)
return rap_bss;
throw rld::error ("Section index '" + rld::to_string (index) +
"' not found: " + obj.name ().full (), "rap::object");
}
uint32_t
object::get_relocations () const
{
uint32_t relocs = 0;
for (int s = 0; s < rap_secs; ++s)
relocs += secs[s].relocs.size ();
return relocs;
}
uint32_t
object::get_relocations (int sec) const
{
if ((sec < 0) || (sec >= rap_secs))
throw rld::error ("Invalid section index '" + rld::to_string (sec),
"rap::relocations");
return secs[sec].relocs.size ();
}
void
object::output ()
{
std::cout << "rap:object: " << obj.name ().full () << std::endl;
secs[rap_text].output ();
secs[rap_const].output ();
secs[rap_ctor].output ();
secs[rap_dtor].output ();
secs[rap_data].output ();
if (secs[rap_bss].size ())
std::cout << " bss: size: " << secs[rap_bss].size () << std::endl;
}
image::image ()
{
clear ();
}
void
image::layout (const files::object_list& app_objects,
const std::string& init,
const std::string& fini)
{
clear ();
/*
* Create the local objects which contain the layout information.
*/
for (files::object_list::const_iterator aoi = app_objects.begin ();
aoi != app_objects.end ();
++aoi)
{
files::object& app_obj = *(*aoi);
if (!app_obj.valid ())
throw rld::error ("Not valid: " + app_obj.name ().full (),
"rap::layout");
objs.push_back (object (app_obj));
}
for (objects::iterator oi = objs.begin (), poi = objs.begin ();
oi != objs.end ();
++oi)
{
object& obj = *oi;
/*
* Update the offsets in the object file. We need the object's offset
* to set the relocation offset's correctly as they are relative to the
* object file.
*/
if (oi != objs.begin ())
{
object& pobj = *poi;
for (int s = 0; s < rap_secs; ++s)
{
obj.secs[s].set_offset (pobj.secs[s]);
sec_size[s] = obj.secs[s].offset + obj.secs[s].size ();
sec_align[s] = obj.secs[s].alignment ();
if (obj.secs[s].rela == true)
sec_rela[s] = obj.secs[s].rela;
}
++poi;
}
else
{
for (int s = 0; s < rap_secs; ++s)
{
sec_size[s] = obj.secs[s].size ();
sec_align[s] = obj.secs[s].alignment ();
if (obj.secs[s].rela == true)
sec_rela[s] = true;
}
}
collect_symbols (obj);
relocs_size += obj.get_relocations ();
if (rld::verbose () >= RLD_VERBOSE_DETAILS)
obj.output ();
}
init_off = strtab.size () + 1;
strtab += '\0';
strtab += init;
fini_off = strtab.size () + 1;
strtab += '\0';
strtab += fini;
if (rld::verbose () >= RLD_VERBOSE_INFO)
{
uint32_t total = (sec_size[rap_text] + sec_size[rap_const] +
sec_size[rap_data] + sec_size[rap_bss] +
symtab_size + strtab.size() + relocs_size);
std::cout << "rap::layout: total:" << total
<< " text:" << sec_size[rap_text]
<< " const:" << sec_size[rap_const]
<< " ctor:" << sec_size[rap_ctor]
<< " dtor:" << sec_size[rap_dtor]
<< " data:" << sec_size[rap_data]
<< " bss:" << sec_size[rap_bss]
<< " symbols:" << symtab_size << " (" << externs.size () << ')'
<< " strings:" << strtab.size () + 1
<< " relocs:" << relocs_size
<< std::endl;
}