[U-Boot-Users] u-boot mpc5xx start.s questions

[278893452]

dear sir or madam,
       When I study the u-boot about mpc5xx, I confuse the definition in cpu/mpc5xx/start.s as follows: 
 /*
 * Set up GOT: Global Offset Table
 *
 * Use r14 to access the GOT 
 */
 START_GOT
 GOT_ENTRY(_GOT2_TABLE_)
 GOT_ENTRY(_FIXUP_TABLE_)
  GOT_ENTRY(_start)
 GOT_ENTRY(_start_of_vectors)
 GOT_ENTRY(_end_of_vectors)
 GOT_ENTRY(transfer_to_handler)
  GOT_ENTRY(__init_end)
 GOT_ENTRY(_end)
 GOT_ENTRY(__bss_start)
 END_GOT
       Will you please kind enough to explain what happens here to me? 
       Thank you!
  
 jjbear
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