ElfHelper.cpp

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//***************************************************************************
//
// File: ElfHelper.cpp
//
// Purpose:
//   implementation of a function that scans an elf file and returns a vector
//   of sections 
//
//***************************************************************************


//******************************************************************************
// system includes
//******************************************************************************

#include <err.h>
#include <gelf.h>



//******************************************************************************
// local includes
//******************************************************************************

#include <lib/support/diagnostics.h>

#include "ElfHelper.hpp"
#include "RelocateCubin.hpp"

#include <Elf_X.h> // ensure EM_CUDA defined

#include <include/hpctoolkit-config.h>


//******************************************************************************
// macros
//******************************************************************************

#ifndef NULL
#define NULL 0
#endif



//******************************************************************************
// interface functions 
//******************************************************************************

bool
ElfFile::open
(
 char *_memPtr,
 size_t _memLen,
 std::string _fileName
)
{
  memPtr = _memPtr;
  memLen = _memLen;
  fileName = _fileName;

  elf_version(EV_CURRENT);
  elf = elf_memory(memPtr, memLen);
  if (elf == 0 || elf_kind(elf) != ELF_K_ELF) {
    return false;
  }
  GElf_Ehdr ehdr_v; 
  GElf_Ehdr *ehdr = gelf_getehdr (elf, &ehdr_v);
  if (!ehdr) {
    return false;
  }
#ifdef EM_CUDA

  if (ehdr->e_machine == EM_CUDA) {
#ifdef DYNINST_USE_CUDA
    relocateCubin(memPtr, elf);
#else
    elf_end(elf);
    return false;
#endif
  }

#endif

  return true;
}


ElfFile::~ElfFile() 
{
  elf_end(elf);
}


// assemble a vector of pointers to each section in an elf binary
ElfSectionVector *
elfGetSectionVector
(
 Elf *elf
)
{
  ElfSectionVector *sections = new ElfSectionVector;
  bool nonempty = false;
  if (elf) {
    Elf_Scn *scn = NULL;
    while ((scn = elf_nextscn(elf, scn)) != NULL) {
      sections->push_back(scn);
      nonempty = true;
    }
  }
  if (nonempty) return sections;
  else {
    delete sections;
    return NULL;
  }
}


char *
elfSectionGetData
(
 char *obj_ptr,
 GElf_Shdr *shdr
)
{
  char *sectionData = obj_ptr + shdr->sh_offset;
  return sectionData;
}