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History

Mike Hommey d278e617c4 Bug 748739 - Link stdc++compat as a static library, and always link it when STDCXX_COMPAT is enabled. r=ted --HG-- rename : build/stdc++compat.cpp => build/unix/stdc++compat/stdc++compat.cpp		2012-04-30 08:03:59 +02:00
..
dummy.c	Bug 628988 part 1 - Modify elfhack test so that the executable actively calls something from the library. r=tglek,a=sdwilsh	2011-01-28 09:22:58 +01:00
elf.cpp	Bug 725284 - Preserve PT_LOAD alignment, except when it's the default on x86-64. r=tglek	2012-02-21 08:08:41 +01:00
elfhack.cpp	Bug 734237 - Make elfhack skip ELF files that aren't shared objects. r=tglek	2012-03-13 09:47:03 +01:00
elfxx.h	Bug 725284 - Preserve PT_LOAD alignment, except when it's the default on x86-64. r=tglek	2012-02-21 08:08:41 +01:00
inject.c
Makefile.in	Bug 748739 - Link stdc++compat as a static library, and always link it when STDCXX_COMPAT is enabled. r=ted	2012-04-30 08:03:59 +02:00
README
test.c	Bug 537857 part 2 - Avoid --gc-sections removing anything from elfhack test case. r=tglek	2011-06-28 08:25:48 +02:00

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.