20020404-1.c

this is a gcc file, you can download it and learn its usetility, for further detail please look at t

/* Extracted from GDB sources. */

typedef long long bfd_signed_vma;
typedef bfd_signed_vma file_ptr;

typedef enum bfd_boolean {false, true} boolean;

typedef unsigned long long bfd_size_type;

typedef unsigned int flagword;

typedef unsigned long long CORE_ADDR;
typedef unsigned long long bfd_vma;

struct bfd_struct {
	int x;
};

struct asection_struct {
  unsigned int user_set_vma : 1;
  bfd_vma vma;
  bfd_vma lma;
  unsigned int alignment_power;
  unsigned int entsize;
};

typedef struct bfd_struct bfd;
typedef struct asection_struct asection;

static bfd *
bfd_openw_with_cleanup (char *filename, const char *target, char *mode);

static asection *
bfd_make_section_anyway (bfd *abfd, const char *name);

static boolean
bfd_set_section_size (bfd *abfd, asection *sec, bfd_size_type val);

static boolean
bfd_set_section_flags (bfd *abfd, asection *sec, flagword flags);

static boolean
bfd_set_section_contents (bfd *abfd, asection *section, void * data, file_ptr offset, bfd_size_type count);

static void
dump_bfd_file (char *filename, char *mode,
               char *target, CORE_ADDR vaddr,
               char *buf, int len)
{
  bfd *obfd;
  asection *osection;

  obfd = bfd_openw_with_cleanup (filename, target, mode);
  osection = bfd_make_section_anyway (obfd, ".newsec");
  bfd_set_section_size (obfd, osection, len);
  (((osection)->vma = (osection)->lma= (vaddr)), ((osection)->user_set_vma = (boolean)true), true);
  (((osection)->alignment_power = (0)),true);
  bfd_set_section_flags (obfd, osection, 0x203);
  osection->entsize = 0;
  bfd_set_section_contents (obfd, osection, buf, 0, len);
}

static bfd *
bfd_openw_with_cleanup (char *filename, const char *target, char *mode)
{
	static bfd foo_bfd = { 0 };
	return &foo_bfd;
}

static asection *
bfd_make_section_anyway (bfd *abfd, const char *name)
{
	static asection foo_section = { false, 0x0, 0x0, 0 };

	return &foo_section;
}

static boolean
bfd_set_section_size (bfd *abfd, asection *sec, bfd_size_type val)
{
	return true;
}

static boolean
bfd_set_section_flags (bfd *abfd, asection *sec, flagword flags)
{
}

static boolean
bfd_set_section_contents (bfd *abfd, asection *section, void * data, file_ptr offset, bfd_size_type count)
{
	if (count != (bfd_size_type)0x1eadbeef)
		abort();
}

static char hello[] = "hello";

int main(void)
{
	dump_bfd_file(0, 0, 0, (CORE_ADDR)0xdeadbeef, hello, (int)0x1eadbeef);
	exit(0);
}