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Author SHA1 Message Date
Rafael Espindola 26d239c293 Skip some relocations in scanRelocs. 
When a tls access is optimized, a group of relocations is converted at a
time.

We were already skipping relocations that were optimized out in
relocate, but not in scanRelocs.

This is a small optimization. I got here while working on a patch that
will always keep scanRelocs and relocate in sync.

llvm-svn: 264048
 2016-03-22 13:24:29 +00:00
Ed Maste f5d3cf6270 Add debugger rendezvous DT_DEBUG .dynamic entry 
The runtime linker may store a pointer to a data structure used by
debuggers.

Differential Revision:	http://reviews.llvm.org/D15775

llvm-svn: 256942
 2016-01-06 15:52:27 +00:00
Rafael Espindola 97cbe3e39c Place RW sections that go after relro to another memory page. 
Before this patch sections that go after relro sequence were placed at
the same memory page with relro ones. It caused segmentation fault on
freebsd.

Fixes PR25790.

Patch by George Rimar with some tweaks by myself.

llvm-svn: 256334
 2015-12-23 15:20:38 +00:00
George Rimar 25411f2558 [ELF] - Implemented @tlsgd optimization (GD->IE case, x64). 
"Ulrich Drepper, ELF Handling For Thread-Local Storage" (5.5 x86-x64 linker optimizations, http://www.akkadia.org/drepper/tls.pdf) shows how GD can be optimized to IE.
This patch implements the optimization.

Differential revision: http://reviews.llvm.org/D15000

llvm-svn: 254713
 2015-12-04 11:20:13 +00:00