size of a input section GNU ld

Question

How do you get the size of an input section in ld? I would assume its just SIZEOF(.section); however ld gives an error upon trying to run that. Is there any way I can do this? .section would be defined in a .asm file like so

section .section
    mov al, 15

Here's the linker script I have so far:

SECTIONS {
    boot : {
        *( .boot );
        . += SECTOR_SIZE - SIZEOF( .boot_header );
        *( .boot_header );
    }
}

Answer 1

I have no problem with SIZEOF.

Just tested:

  .data : 
  {
    . = ALIGN(4);
    _sdata = .;        /* create a global symbol at data start */
    *(.data)           /* .data sections */
    *(.data*)          /* .data* sections */

    . = ALIGN(4);
    _edata = .;        /* define a global symbol at data end */
  } >RAM AT> FLASH
  
    _datasize = SIZEOF(.data); 

Works as expected.