From e774126c9623639b11f8716dee9e49cb2d97649b Mon Sep 17 00:00:00 2001
From: Simon Atanasyan <simon@atanasyan.com>
Date: Wed, 3 Feb 2016 11:50:22 +0000
Subject: [PATCH] [mips] Add SHF_MIPS_GPREL flag to the MIPS .sbss and .sdata
 sections
MIME-Version: 1.0
Content-Type: text/plain; charset=utf8
Content-Transfer-Encoding: 8bit

MIPS ABI states that .sbss and .sdata sections must have SHF_MIPS_GPREL
flag. See Figure 4–7 on page 69 in the following document:
ftp://www.linux-mips.org/pub/linux/mips/doc/ABI/mipsabi.pdf.

Differential Revision: http://reviews.llvm.org/D15740

llvm-svn: 259641
---
 llvm/lib/Target/Mips/MipsTargetObjectFile.cpp |  6 ++++--
 llvm/test/CodeGen/Mips/mips-shf-gprel.ll      | 24 ++++++++++++++++++++++++
 2 files changed, 28 insertions(+), 2 deletions(-)
 create mode 100644 llvm/test/CodeGen/Mips/mips-shf-gprel.ll

diff --git a/llvm/lib/Target/Mips/MipsTargetObjectFile.cpp b/llvm/lib/Target/Mips/MipsTargetObjectFile.cpp
index 79df9a0..e83abdd 100644
--- a/llvm/lib/Target/Mips/MipsTargetObjectFile.cpp
+++ b/llvm/lib/Target/Mips/MipsTargetObjectFile.cpp
@@ -41,10 +41,12 @@ void MipsTargetObjectFile::Initialize(MCContext &Ctx, const TargetMachine &TM){
   InitializeELF(TM.Options.UseInitArray);
 
   SmallDataSection = getContext().getELFSection(
-      ".sdata", ELF::SHT_PROGBITS, ELF::SHF_WRITE | ELF::SHF_ALLOC);
+      ".sdata", ELF::SHT_PROGBITS,
+      ELF::SHF_WRITE | ELF::SHF_ALLOC | ELF::SHF_MIPS_GPREL);
 
   SmallBSSSection = getContext().getELFSection(".sbss", ELF::SHT_NOBITS,
-                                               ELF::SHF_WRITE | ELF::SHF_ALLOC);
+                                               ELF::SHF_WRITE | ELF::SHF_ALLOC |
+                                                   ELF::SHF_MIPS_GPREL);
   this->TM = &static_cast<const MipsTargetMachine &>(TM);
 }
 
diff --git a/llvm/test/CodeGen/Mips/mips-shf-gprel.ll b/llvm/test/CodeGen/Mips/mips-shf-gprel.ll
new file mode 100644
index 0000000..8b5fbaa
--- /dev/null
+++ b/llvm/test/CodeGen/Mips/mips-shf-gprel.ll
@@ -0,0 +1,24 @@
+; Check that .sdata section has SHF_MIPS_GPREL flag.
+
+; RUN: llc -mips-ssection-threshold=16 -mgpopt -mattr=noabicalls \
+; RUN:     -relocation-model=static -march=mips -o - %s -filetype=obj \
+; RUN:   | llvm-readobj -s | FileCheck %s
+
+@data1 = global [4 x i32] [i32 1, i32 2, i32 3, i32 4], align 4
+@date2 = global [4 x i32] zeroinitializer, align 4
+
+; CHECK:      Name: .sdata
+; CHECK-NEXT: Type: SHT_PROGBITS
+; CHECK-NEXT: Flags [ (0x10000003)
+; CHECK-NEXT:   SHF_ALLOC
+; CHECK-NEXT:   SHF_MIPS_GPREL
+; CHECK-NEXT:   SHF_WRITE
+; CHECK-NEXT: ]
+
+; CHECK:      Name: .sbss
+; CHECK-NEXT: Type: SHT_NOBITS
+; CHECK-NEXT: Flags [ (0x10000003)
+; CHECK-NEXT:   SHF_ALLOC
+; CHECK-NEXT:   SHF_MIPS_GPREL
+; CHECK-NEXT:   SHF_WRITE
+; CHECK-NEXT: ]
-- 
2.7.4