From fb8565a9c6f43b57ab1c646986c52ddbacfad7b4 Mon Sep 17 00:00:00 2001
From: Shankar Easwaran <shankare@codeaurora.org>
Date: Thu, 31 Jan 2013 16:04:47 +0000
Subject: [PATCH] add support for assigning virtual addresses to TDATA/TBSS
 sections

llvm-svn: 174065
---
 lld/lib/ReaderWriter/ELF/DefaultLayout.h |  8 ++++++++
 lld/lib/ReaderWriter/ELF/SectionChunks.h |  1 -
 lld/lib/ReaderWriter/ELF/SegmentChunks.h | 23 ++++++++++++++++-------
 3 files changed, 24 insertions(+), 8 deletions(-)

diff --git a/lld/lib/ReaderWriter/ELF/DefaultLayout.h b/lld/lib/ReaderWriter/ELF/DefaultLayout.h
index 8b87a66fbe2a..326019f9a31c 100644
--- a/lld/lib/ReaderWriter/ELF/DefaultLayout.h
+++ b/lld/lib/ReaderWriter/ELF/DefaultLayout.h
@@ -63,6 +63,8 @@ public:
     ORDER_RODATA = 100,
     ORDER_EH_FRAME = 110,
     ORDER_EH_FRAMEHDR = 120,
+    ORDER_TDATA = 124,
+    ORDER_TBSS = 128,
     ORDER_CTORS = 130,
     ORDER_DTORS = 140,
     ORDER_INIT_ARRAY = 150,
@@ -353,6 +355,10 @@ Layout::SegmentType DefaultLayout<ELFT>::getSegmentType(
   case ORDER_FINI_ARRAY:
     return llvm::ELF::PT_LOAD;
 
+  case ORDER_TDATA:
+  case ORDER_TBSS:
+    return llvm::ELF::PT_TLS;
+
   default:
     return llvm::ELF::PT_NULL;
   }
@@ -376,6 +382,8 @@ bool DefaultLayout<ELFT>::hasOutputSegment(Section<ELFT> *section) {
   case ORDER_RODATA:
   case ORDER_EH_FRAME:
   case ORDER_EH_FRAMEHDR:
+  case ORDER_TDATA:
+  case ORDER_TBSS:
   case ORDER_NOTE:
   case ORDER_DYNAMIC:
   case ORDER_CTORS:
diff --git a/lld/lib/ReaderWriter/ELF/SectionChunks.h b/lld/lib/ReaderWriter/ELF/SectionChunks.h
index bb53ad7c5241..101089dec222 100644
--- a/lld/lib/ReaderWriter/ELF/SectionChunks.h
+++ b/lld/lib/ReaderWriter/ELF/SectionChunks.h
@@ -81,7 +81,6 @@ public:
     for (auto &ai : _atoms) {
       ai->_virtualAddr = addr + ai->_fileOffset;
     }
-    addr += this->memSize();
   }
 
   /// \brief Set the file offset of each Atom in the section. This routine
diff --git a/lld/lib/ReaderWriter/ELF/SegmentChunks.h b/lld/lib/ReaderWriter/ELF/SegmentChunks.h
index 12ced7036acc..efdfc655fd99 100644
--- a/lld/lib/ReaderWriter/ELF/SegmentChunks.h
+++ b/lld/lib/ReaderWriter/ELF/SegmentChunks.h
@@ -318,9 +318,13 @@ Segment<ELFT>::assignOffsets(uint64_t startOffset) {
 }
 
 /// \brief Assign virtual addresses to the slices
-template<class ELFT>
-void 
-Segment<ELFT>::assignVirtualAddress(uint64_t &addr) {
+template <class ELFT> void Segment<ELFT>::assignVirtualAddress(uint64_t &addr) {
+  // Check if the segment is of type TLS 
+  // The sections that belong to the TLS segment have their 
+  // virtual addresses that are relative To TP
+  bool isTLSSegment = (segmentType() == llvm::ELF::PT_TLS);
+  uint64_t tlsStartAddr = 0;
+
   for (auto slice : slices()) {
     // Align to a page
     addr = llvm::RoundUpToAlignment(addr, this->_targetInfo.getPageSize());
@@ -331,15 +335,20 @@ Segment<ELFT>::assignVirtualAddress(uint64_t &addr) {
     for (auto section : slice->sections()) {
       // Align the section address
       addr = llvm::RoundUpToAlignment(addr, section->align2());
+      tlsStartAddr = (isTLSSegment) ?
+                    llvm::RoundUpToAlignment(tlsStartAddr, section->align2()):0;
       if (!virtualAddressSet) {
         slice->setVAddr(addr);
         virtualAddressSet = true;
       }
       section->setVAddr(addr);
-      if (auto s = dyn_cast<Section<ELFT>>(section))
-        s->assignVirtualAddress(addr);
-      else
-        addr += section->memSize();
+      if (auto s = dyn_cast<Section<ELFT> >(section)) {
+        if (isTLSSegment)
+          s->assignVirtualAddress(tlsStartAddr);
+        else
+          s->assignVirtualAddress(addr);
+      }
+      addr += section->memSize();
       section->setMemSize(addr - section->virtualAddr());
     }
     slice->setMemSize(addr - slice->virtualAddr());