Mirror of roytam1's UXP fork just in case Moonchild and Tobin decide to go after him
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Moonchild 0cd673d720 Issue #1656 - Part 6: Clean up the build files 1 year ago
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inject Issue #1656 - Part 6: Clean up the build files 1 year ago
Makefile.in import FIREFOX_52_6_0esr_RELEASE from mozilla-esr52 hg repo 4 years ago
README import FIREFOX_52_6_0esr_RELEASE from mozilla-esr52 hg repo 4 years ago
dummy.c import FIREFOX_52_6_0esr_RELEASE from mozilla-esr52 hg repo 4 years ago
elf.cpp import FIREFOX_52_6_0esr_RELEASE from mozilla-esr52 hg repo 4 years ago
elfhack.cpp import FIREFOX_52_6_0esr_RELEASE from mozilla-esr52 hg repo 4 years ago
elfxx.h import FIREFOX_52_6_0esr_RELEASE from mozilla-esr52 hg repo 4 years ago
inject.c import FIREFOX_52_6_0esr_RELEASE from mozilla-esr52 hg repo 4 years ago
moz.build Issue #1656 - Part 6: Clean up the build files 1 year ago
test-array.c import FIREFOX_52_6_0esr_RELEASE from mozilla-esr52 hg repo 4 years ago
test-ctors.c import FIREFOX_52_6_0esr_RELEASE from mozilla-esr52 hg repo 4 years ago
test.c import FIREFOX_52_6_0esr_RELEASE from mozilla-esr52 hg repo 4 years ago

README

Elfhack is a program to optimize ELF binaries for size and cold startup
speed.

Presently, it is quite experimental, though it works well for the target
it was created for: Firefox's libxul.so.

Elfhack currently only does one thing: packing dynamic relocations ;
which ends up being a quite complex task, that can be summarized this
way:
- Remove RELATIVE relocations from the .rel.dyn/.rela.dyn section.
- Inject a small code able to apply relative relocations "by hand"
after the .rel.dyn/.rela.dyn section.
- Inject a section containing relocative relocations in a different
and more packed format, after the small code.
- Register the small code as DT_INIT function. Make the small code call
what was initially the DT_INIT function, if there was one.
- Remove the hole between the new section containing relative
relocations and the following sections, adjusting offsets and base
addresses accordingly.
- Adjust PT_LOAD entries to fit new offsets, and add an additional
PT_LOAD entry when that is necessary to handle the discrepancy between
offsets and base addresses, meaning the section offsets may yet again
need adjustments.
- Adjust various DT_* dynamic tags to fit the new ELF layout.
- Adjust section headers.
- Adjust ELF headers.

See http://glandium.org/blog/?p=1177#relocations for some figures.