X86_64 cross compiler and generating binaries

["wink saville" <wink at saville dot com>]

Hello,

I'm looking to create a simple kernel for the Amd64 and want to make a boot
loader to start with. I have followed the instructions provided here,
http://www.nondot.org/sabre/os/files/Booting/CompilingBinaryFilesUsingACompi
ler.pdf.

I created a small program, t1.c:

int main(int argc, char *argv[])
{
   int i;
   int j;

   for(i=0; i < 1000; i++)
   {
      j += 1;
   }

   return j;
}

When I compile this using a cross compiler created using Kegel's crosstool
(http://kegel.com/crosstool/) using the following:

  gcc -c -o t1.o t1.c
  ld -Ttext 0x0 -e main -o t1 t1.o
  objcopy -R .note -R .comment -S -O binary t1 t1.bin

The result is:

  t1.o   1256 bytes
  t1     1049835 bytes
  t1.bin 1048680 bytes

When I compile it with gcc 3.3.2 (Debian) using the same options

  gcc -c -o t1.o t1.c
  ld -Ttext 0x0 -e main -o t1 t1.o
  objcopy -R .note -R .comment -S -O binary t1 t1.bin

The result is:

  t1.o   699 bytes
  t1     4791 bytes
  t1.bin 51 bytes

Sooooo, the 1M file is a mite big, any ideas what I'm doing wrong?

Thanks,

Wink



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