elf_map: why offset of vma need to subtract eppnt->p_vaddr ?

[Jacky]

 Hi All,

When mmaping elf image into memory, why offset vma need to subtract 
eppnt->p_vaddr as the following code ?

static unsigned long elf_map()
{
    ...
    unsigned long off = eppnt->p_offset - ELF_PAGEOFFSET(eppnt->p_vaddr);
    ...
}

Thanks in advance.

Jacky




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