mozilla-b2g/platform_bionic — pull request #6 by atilag (2014-09-11 22:57:04+00:00)
Title: arm: rewrite crtbegin* as C files.

Rewrite
crtbegin.S -> crtbegin.c
crtbegin_so.S -> crtbegin_so.c

This change allows us to generate PIC code without relying
on text relocations.

As a consequence of this rewrite, also rewrite
__dso_handle.S -> __dso_handle.c
__dso_handle_so.S -> __dso_handle_so.c
atexit.S -> atexit.c

In crtbegin.c _start, place the __PREINIT_ARRAY__, __INIT_ARRAY__,
__FINI_ARRAY__, and __CTOR_LIST__ variables onto the stack, instead of
passing a pointer to the text section of the binary.

This change appears sorta wonky, as I attempted to preserve,
as much as possible, the structure of the original assembly.
As a result, you have C files including other C files, and other
programming uglyness.

Result: This change reduces the number of files with text-relocations
from 315 to 19 on my Android build.

Before:
$ scanelf -aR $OUT/system | grep TEXTREL | wc -l
315

After:
$ scanelf -aR $OUT/system | grep TEXTREL | wc -l
19

Change-Id: Ib9f98107c0eeabcb606e1ddc7ed7fc4eba01c9c4

Conflicts:
libc/Android.mk
libc/arch-arm/bionic/crtbegin.S
libc/arch-arm/bionic/crtbegin.c
libc/arch-arm/bionic/crtbegin_dynamic.S
libc/arch-arm/bionic/crtbegin_so.c

Bug 1056337 - Investigate upgrading the toolchain used for B2G ICS builds (and stop using GCC 4.4)
We need to apply these changes in order to compile with a newer toolchain (because of text relocations in CRT stuff)