> - base address (determined by ld.elf_so for each process)

base address of what?  this late at night, i'm thinking you mean the
shared library, but i see this:

% cd /proc
% pmap [1-9]* | grep 'exec.*libc.so' | sort -u
4805C000    572K read/exec         /lib/libc.so.12.89
4805D000    572K read/exec         /lib/libc.so.12.89
48060000    572K read/exec         /lib/libc.so.12.89
48065000    572K read/exec         /lib/libc.so.12.89
48067000    572K read/exec         /lib/libc.so.12.89
4806C000    572K read/exec         /lib/libc.so.12.89
48072000    572K read/exec         /lib/libc.so.12.89
48079000    572K read/exec         /lib/libc.so.12.89
4808C000    572K read/exec         /lib/libc.so.12.89
480AA000    572K read/exec         /lib/libc.so.12.89
480FC000    572K read/exec         /lib/libc.so.12.89
4811C000    572K read/exec         /lib/libc.so.12.89
48127000    572K read/exec         /lib/libc.so.12.89
48152000    572K read/exec         /lib/libc.so.12.89
48155000    572K read/exec         /lib/libc.so.12.89
48158000    572K read/exec         /lib/libc.so.12.89
48169000    572K read/exec         /lib/libc.so.12.89
48180000    572K read/exec         /lib/libc.so.12.89
48192000    572K read/exec         /lib/libc.so.12.89
4819D000    572K read/exec         /lib/libc.so.12.89
4819E000    572K read/exec         /lib/libc.so.12.89
481A1000    572K read/exec         /lib/libc.so.12.89
481B8000    572K read/exec         /lib/libc.so.12.89
481C8000    572K read/exec         /lib/libc.so.12.89
481D6000    572K read/exec         /lib/libc.so.12.89
48205000    572K read/exec         /lib/libc.so.12.89
4823E000    572K read/exec         /lib/libc.so.12.89

mmm...lots of different base addresses.  hmm?

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