ld question

[biguo@263.net]

Hello,everyone!I am building a cross GNAT/RTEMS tools on i386EX board.The start address  of IDT/GDT and stack don't be defined in file linkcmds.Which file are they be defined?That is to say,how GNU ld define the start address of IDT/GDT and STACK?Another question:Is memory layout in file linkcmds only used to burn application into target board,not in GDB state?Thanks.  
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