While trying to investigate a problem with the ssl module in the python
port I found that the SystemMonitor Stack tab for a process wouldn't
show the symbols for the libssl and libcrypto shared libraries that are
installed under /usr/local/lib. The main reason for this is that
LibSymbolication didn't look for libraries under /usr/local/lib.
This commit adds support for looking for libraries under /usr/local/lib.
Absolute paths are still respected, and lookup gives precedence to
/usr/lib, just like dynamic linker does.
We were incorrectly assuming that the mapped .text segment for an ELF
image was always at the base of the image mapping. Now that we have
.rodata mappings as well, it's possible for one of them to come before
the .text.
This enables further work on implementing KASLR by adding relocation
support to the pre-kernel and updating the kernel to be less dependent
on specific virtual memory layouts.
This removes all the hard-coded kernel base addresses from userspace
tools.
One downside for this is that e.g. Profiler no longer uses a different
color for kernel symbols when run as a non-root user.
This fixes an issue were some LibDebug objects (for example,
Dwarf::CompilationUnit) held a reference to their parent
Dwarf::DwarfInfo object, which was constructed on the stack and later
moved to the heap.
