Ulrich Weigand 7a34599db0 [PowerPC] Revert r185476 and fix up TLS variant kinds ... In the commit message to r185476 I wrote: >The PowerPC-specific modifiers VK_PPC_TLSGD and VK_PPC_TLSLD >correspond exactly to the generic modifiers VK_TLSGD and VK_TLSLD. >This causes some confusion with the asm parser, since VK_PPC_TLSGD >is output as @tlsgd, which is then read back in as VK_TLSGD. > >To avoid this confusion, this patch removes the PowerPC-specific >modifiers and uses the generic modifiers throughout. (The only >drawback is that the generic modifiers are printed in upper case >while the usual convention on PowerPC is to use lower-case modifiers. >But this is just a cosmetic issue.) This was unfortunately incorrect, there is is fact another, serious drawback to using the default VK_TLSLD/VK_TLSGD variant kinds: using these causes ELFObjectWriter::RelocNeedsGOT to return true, which in turn causes the ELFObjectWriter to emit an undefined reference to _GLOBAL_OFFSET_TABLE_. This is a problem on powerpc64, because it uses the TOC instead of the GOT, and the linker does not provide _GLOBAL_OFFSET_TABLE_, so the symbol remains undefined. This means shared libraries using TLS built with the integrated assembler are currently broken. While the whole RelocNeedsGOT / _GLOBAL_OFFSET_TABLE_ situation probably ought to be properly fixed at some point, for now I'm simply reverting the r185476 commit. Now this in turn exposes the breakage of handling @tlsgd/@tlsld in the asm parser that this check-in was originally intended to fix. To avoid this regression, I'm also adding a different fix for this problem: while common code now parses @tlsgd as VK_TLSGD, a special hack in the asm parser translates this code to the platform-specific VK_PPC_TLSGD that the back-end now expects. While this is not really pretty, it's self-contained and shouldn't hurt anything else for now. One the underlying problem is fixed, this hack can be reverted again. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@185945 91177308-0d34-0410-b5e6-96231b3b80d8		2013-07-09 16:41:09 +00:00
..
CMakeLists.txt	[PowerPC] Clean up generation of ha16() / lo16() markers	2013-05-23 22:26:41 +00:00
LLVMBuild.txt	LLVMBuild: Remove trailing newline, which irked me.	2011-12-12 19:48:00 +00:00
Makefile
PPCAsmBackend.cpp	[PowerPC] Support @tls in the asm parser	2013-07-05 12:22:36 +00:00
PPCELFObjectWriter.cpp	[PowerPC] Revert r185476 and fix up TLS variant kinds	2013-07-09 16:41:09 +00:00
PPCFixupKinds.h	[PowerPC] Support @tls in the asm parser	2013-07-05 12:22:36 +00:00
PPCMCAsmInfo.cpp	[PowerPC] Always use "assembler dialect" 1	2013-07-08 20:20:51 +00:00
PPCMCAsmInfo.h	Emacs-tag and some comment fix for all ARM, CellSPU, Hexagon, MBlaze, MSP430, PPC, PTX, Sparc, X86, XCore.	2012-02-18 12:03:15 +00:00
PPCMCCodeEmitter.cpp	[PowerPC] Support @tls in the asm parser	2013-07-05 12:22:36 +00:00
PPCMCExpr.cpp	[PowerPC] Always use "assembler dialect" 1	2013-07-08 20:20:51 +00:00
PPCMCExpr.h	[PowerPC] Always use "assembler dialect" 1	2013-07-08 20:20:51 +00:00
PPCMCTargetDesc.cpp	[PowerPC] Always use "assembler dialect" 1	2013-07-08 20:20:51 +00:00
PPCMCTargetDesc.h	To avoid symbol clash, undefine PPC here. PPC may be predefined on some hosts.	2013-03-17 12:40:42 +00:00
PPCPredicates.cpp	[PowerPC] Add predicted forms of branches	2013-06-24 16:52:04 +00:00
PPCPredicates.h	[PowerPC] Add predicted forms of branches	2013-06-24 16:52:04 +00:00