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Author SHA1 Message Date
Rafael Espindola 66434562e7 Fix copy relocations in pie. 
We were creating the copy relocations just fine, but then thinking that
the .bss position could be preempted and creating a dynamic relocation
to it, which would crash at runtime since that memory is read only.

llvm-svn: 268668
 2016-05-05 19:41:49 +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 e3336c0be6 Reapply fixed r253967. 
llvm-svn: 253971
 2015-11-24 10:15:50 +00:00
George Rimar 11721ce810 Revert r253967 which broke buildbot. 
llvm-svn: 253970
 2015-11-24 10:04:22 +00:00
George Rimar 63a6ca9150 [ELF] Implements -z relro: create an ELF "PT_GNU_RELRO" segment header in the object. 
Partial (-z relro) and full (-z relro, -z now) relro cases are implemented.

Partial relro:
The ELF sections are reordered so that the ELF internal data sections (.got, .dtors, etc.) precede the program's data sections (.data and .bss).
.got is readonly, .got.plt is still writeable.

Full relro:
Supports all the features of partial RELRO, .got.plt is also readonly.

Differential revision: http://reviews.llvm.org/D14218

llvm-svn: 253967
 2015-11-24 09:44:28 +00:00