For a litttle more understanding do:
elfdump unix | less
this is 32 bit DEBUG unix, 64 bit is similar.
non DEBUG has smaller sizes.
...
Program Header[0]:
p_vaddr: 0xc00000 p_flags: [ PF_X PF_W PF_R ]
p_paddr: 0xc00000 p_type: [ PT_LOAD ]
p_filesz: 0xd994 p_memsz: 0xd994
p_offset: 0xf4 p_align: 0
(this is the self contained "dboot" program - linked to load and
run at the same address (see p_paddr and p_vaddr)
Program Header[1]:
p_vaddr: 0xfe800000 p_flags: [ PF_X PF_R ]
p_paddr: 0x400000 p_type: [ PT_LOAD ]
p_filesz: 0xabc38 p_memsz: 0xabc38
p_offset: 0xdaa0 p_align: 0
(the rest of kernel text - linked to run at a high virtual address, but
loads low, followed below by kernel data)
Program Header[2]:
p_vaddr: 0xfec00000 p_flags: [ PF_X PF_W PF_R ]
p_paddr: 0x800000 p_type: [ PT_LOAD ]
p_filesz: 0x9e23 p_memsz: 0x45bcc
p_offset: 0xb9700 p_align: 0
...
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