linker script

please see more details of this link:
http://sourceware.org/binutils/docs-2.16/ld/Scripts.html#Scripts

First of all, let me introduce what the linker does:
after you compile the program:
gcc -c -g -Wall main.c
gcc -c -g -Wall swap.c

you will get two relocatable binary file: main.o and swap.o file. By using linker(ld), you will relocate the two .o files into a executable binary file named a.out.

if you want more detail information about linker, please see the slides 14:
http://www.cs.gmu.edu/~setia/cs367/slides/index.html


Every link is controlled by a linker script. This script is written in the linker command language.
for example, smm.ld is link script.
please see man ld or info ld, you could use option: -T to add the link script.
If you don't specify -T option, the linker will use the default linker script.

I also attached a sample of the formate of linker command language:
/* Maximum number of CPUs/cores */
CPUS = 4;

SECTIONS
{
    /* This is the actual SMM handler.
     *
     * We just put code, rodata, data and bss all in a row.
     */
    . = 0xa0000;
    .handler (.): {
        /* Assembler stub */
        *(.handler)

        /* C code of the SMM handler */
        *(.text);
        *(.text.*);

        /* C read-only data of the SMM handler */
        . = ALIGN(16);
        *(.rodata)
        *(.rodata.*)

        /* C read-write data of the SMM handler */
         . = ALIGN(4);
        *(.data)

        /* C uninitialized data of the SMM handler */
         . = ALIGN(4);
        *(.bss)
        *(.sbss)

        /* What is this? */
        *(COMMON)
         . = ALIGN(4);
    }

    /* We are using the ASEG interleaved to stuff the SMM handlers
     * for all CPU cores in there. The jump table redirects the execution
     * to the actual SMM handler
     */
    . = 0xa8000 - (( CPUS - 1) * 0x400);
    .jumptable : {
        *(.jumptable)
    }

    /DISCARD/ : {
        *(.comment)
        *(.note)
        *(.note.*)
    }
}