~/.local/share/Steam/ubuntu12_32/steam has a symbol with a weird
binding type part way through its symbol table:

46 [OBJECT   LOOS/GNU_UNIQUE] size: 0 (0)_ZNSs4_Rep20_S_empty_rep_storageE 0000 (nil)

but we can't just stop there, because there are symbols after it that
need relocating.

I blame C++.

Signed-off-by: Simon McVittie <smcv@collabora.com>

Signed-off-by: Simon McVittie <smcv@collabora.com>

Signed-off-by: Simon McVittie <smcv@collabora.com>

Signed-off-by: Simon McVittie <smcv@collabora.com>

This seemed easier than fixing the corner cases individually.

Signed-off-by: Simon McVittie <smcv@collabora.com>

This makes it a little simpler to reason about.

Signed-off-by: Simon McVittie <smcv@collabora.com>

Signed-off-by: Simon McVittie <smcv@collabora.com>

Signed-off-by: Simon McVittie <smcv@collabora.com>

ptr_list_push_addr - unconditionaly add an ElfW(Addr)
ptr_list_push_ptr  - unconditionaly add a void *
ptr_list_contains  - check if an ElfW(addr) is present
ptr_list_add_ptr   - add a void * only if not currently in list
ptr_list_push      - renamed to ptr_list_push_addr

Conflicts:
	utils/utils.c

Signed-off-by: Simon McVittie <smcv@collabora.com>

Use the right type for that role.

Signed-off-by: Simon McVittie <smcv@collabora.com>

base is a valid pointer into memory, whereas start is only an offset
and so is not a pointer that we can dereference. Previously, base was
a pointer-sized integer and start was a pointer, which is exactly
backwards if we want to stick to a rule of "it's a pointer iff
you could dereference it".

Signed-off-by: Simon McVittie <smcv@collabora.com>

Signed-off-by: Simon McVittie <smcv@collabora.com>

Signed-off-by: Simon McVittie <smcv@collabora.com>

Signed-off-by: Simon McVittie <smcv@collabora.com>

Partially works. The capsule_relocate_except seen-it cache works.

The one for capsule_relocate needs to be off for now - for some reason
it makes Dungeon Defenders not work. Still faster than no seen-it
filter at all though.

Some ElfW(Rel[a]) d_ptr items are pre-calculated form base, others not.

The removal of the addr() address/base fixup logic aldo turns out
to have been premature, so restored for the find_ptr() helper.

Signed-off-by: Simon McVittie <smcv@collabora.com>

In addition to wrapping dlopen() inside the capsule we need to
wrap dlsym() outside the capsule in order to allow libraries
that use a dlopen()/dlsym() pattern to work transparently.

capsule_shim_dlsym() bundles most of the standard logic we
expect such wrappers to use.

These are needed by both libcapsule itself and by the stub library
generator tooling, so they have to live outside of libcapsule itself.

Define and use some per-word-size printf format macros so our
debug functions can be -Wall -Werror clean on both models.

The generated shim libraries (libz and libGL are included as examples)
provide the same symbols as the target library but do not expose the
symbols from their dependencies to other objects that link to them.

They are also capable of using a filesystem tree starting somwhere
other than / to get the dependencies for the target.

Included are tools to help generate said proxy libraries with minimal
manual intervention.