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gecko/build/unix/elfhack
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Gregory Szorc bcf3de711c Bug 891632 - Port NO_DIST_INSTALL to moz.build; r=joey 
Many of the moved variables are likely not needed. moz.build should one
day validate the sandbox's output and error if "useless" variables are
present.

--HG--
extra : rebase_source : 3abdea056c18d00ede8c15b37db60532eca58630
2013-07-10 12:08:21 -07:00
..
dummy.c Bug 716295 part 6 - Create elfhack tests for both DT_INIT and DT_INIT_ARRAY. r=nfroyd 2012-08-09 16:34:26 +02:00
elf.cpp Bug 654087 - Don't error out on gold special treatment of PT_TLS segment memsize. r=nfroyd 2013-01-16 09:15:07 +01:00
elfhack.cpp Bug 851002 - Adjust Elf headers before adding filler segment in elfhack. r=nfroyd 2013-03-17 08:03:06 +01:00
elfxx.h Bug 822584 - Workaround in elfhack to accomodate for breakpad not handling the memory mapping induced by the elfhack/bionic linker combination. r=nfroyd 2013-01-02 10:17:32 +01:00
inject.c
Makefile.in Bug 891632 - Port NO_DIST_INSTALL to moz.build; r=joey 2013-07-10 12:08:21 -07:00
moz.build Bug 891632 - Port NO_DIST_INSTALL to moz.build; r=joey 2013-07-10 12:08:21 -07:00
README
test-array.c Bug 716295 part 6 - Create elfhack tests for both DT_INIT and DT_INIT_ARRAY. r=nfroyd 2012-08-09 16:34:26 +02:00
test-ctors.c Bug 716295 part 6 - Create elfhack tests for both DT_INIT and DT_INIT_ARRAY. r=nfroyd 2012-08-09 16:34:26 +02:00
test.c Bug 654087 - Don't error out on gold special treatment of PT_TLS segment memsize. r=nfroyd 2013-01-16 09:15:07 +01:00

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.