This patch that sets the Mips ELF header flag for

MicroMips architectures. 

Contributer: Zoran Jovanovic
 


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@174360 91177308-0d34-0410-b5e6-96231b3b80d8

6 files changed, 22 insertions, 2 deletions

diff --git a/include/llvm/Support/ELF.h b/include/llvm/Support/ELF.h
index a1b8f54448..2c831a691b 100644
--- a/include/llvm/Support/ELF.h
+++ b/include/llvm/Support/ELF.h
@@ -747,7 +747,8 @@ enum {
   EF_MIPS_ARCH_64   = 0x60000000, // MIPS64 instruction set per linux not elf.h
   EF_MIPS_ARCH_32R2 = 0x70000000, // mips32r2
   EF_MIPS_ARCH_64R2 = 0x80000000, // mips64r2
-  EF_MIPS_ARCH      = 0xf0000000  // Mask for applying EF_MIPS_ARCH_ variant
+  EF_MIPS_ARCH      = 0xf0000000, // Mask for applying EF_MIPS_ARCH_ variant
+  EF_MIPS_MICROMIPS = 0x02000000  // microMIPS
 };
 
 // ELF Relocation types for Mips
diff --git a/lib/Target/Mips/MCTargetDesc/MipsELFStreamer.cpp b/lib/Target/Mips/MCTargetDesc/MipsELFStreamer.cpp
index 89891ff7f9..9c454d6169 100644
--- a/lib/Target/Mips/MCTargetDesc/MipsELFStreamer.cpp
+++ b/lib/Target/Mips/MCTargetDesc/MipsELFStreamer.cpp
@@ -45,6 +45,9 @@ namespace llvm {
     else
       EFlags |= ELF::EF_MIPS_ARCH_32;
 
+    if (Subtarget.inMicroMipsMode())
+      EFlags |= ELF::EF_MIPS_MICROMIPS;
+
     // Relocation Model
     Reloc::Model RM = Subtarget.getRelocationModel();
     if (RM == Reloc::PIC_ || RM == Reloc::Default)
diff --git a/lib/Target/Mips/Mips.td b/lib/Target/Mips/Mips.td
index 23e2a948a5..13266233dd 100644
--- a/lib/Target/Mips/Mips.td
+++ b/lib/Target/Mips/Mips.td
@@ -80,6 +80,9 @@ def FeatureDSP : SubtargetFeature<"dsp", "HasDSP", "true", "Mips DSP ASE">;
 def FeatureDSPR2 : SubtargetFeature<"dspr2", "HasDSPR2", "true",
                                     "Mips DSP-R2 ASE", [FeatureDSP]>;
 
+def FeatureMicroMips  : SubtargetFeature<"micromips", "InMicroMipsMode", "true",
+                                         "microMips mode">;
+
 //===----------------------------------------------------------------------===//
 // Mips processors supported.
 //===----------------------------------------------------------------------===//
diff --git a/lib/Target/Mips/MipsSubtarget.cpp b/lib/Target/Mips/MipsSubtarget.cpp
index 6ad97db762..75b4c98a9f 100644
--- a/lib/Target/Mips/MipsSubtarget.cpp
+++ b/lib/Target/Mips/MipsSubtarget.cpp
@@ -32,7 +32,8 @@ MipsSubtarget::MipsSubtarget(const std::string &TT, const std::string &CPU,
   IsSingleFloat(false), IsFP64bit(false), IsGP64bit(false), HasVFPU(false),
   IsLinux(true), HasSEInReg(false), HasCondMov(false), HasSwap(false),
   HasBitCount(false), HasFPIdx(false),
-  InMips16Mode(false), HasDSP(false), HasDSPR2(false), IsAndroid(false), RM(_RM)
+  InMips16Mode(false), InMicroMipsMode(false), HasDSP(false), HasDSPR2(false),
+  IsAndroid(false), RM(_RM)
 {
   std::string CPUName = CPU;
   if (CPUName.empty())
diff --git a/lib/Target/Mips/MipsSubtarget.h b/lib/Target/Mips/MipsSubtarget.h
index 63cde8d668..32baa3d85a 100644
--- a/lib/Target/Mips/MipsSubtarget.h
+++ b/lib/Target/Mips/MipsSubtarget.h
@@ -89,6 +89,9 @@ protected:
   // InMips16 -- can process Mips16 instructions
   bool InMips16Mode;
 
+  // InMicroMips -- can process MicroMips instructions
+  bool InMicroMipsMode;
+
   // HasDSP, HasDSPR2 -- supports DSP ASE.
   bool HasDSP, HasDSPR2;
 
@@ -138,6 +141,7 @@ public:
   bool isNotSingleFloat() const { return !IsSingleFloat; }
   bool hasVFPU() const { return HasVFPU; }
   bool inMips16Mode() const { return InMips16Mode; }
+  bool inMicroMipsMode() const { return InMicroMipsMode; }
   bool hasDSP() const { return HasDSP; }
   bool hasDSPR2() const { return HasDSPR2; }
   bool isAndroid() const { return IsAndroid; }
diff --git a/test/MC/Mips/elf_eflags.ll b/test/MC/Mips/elf_eflags.ll
index 4f29c72345..bb7857dd0f 100644
--- a/test/MC/Mips/elf_eflags.ll
+++ b/test/MC/Mips/elf_eflags.ll
@@ -17,6 +17,8 @@
 ; RUN: llc -filetype=obj -mtriple mipsel-unknown-linux -mcpu=mips32 %s -o - | elf-dump --dump-section-data  | FileCheck -check-prefix=CHECK-BE32_PIC %s
 ; RUN: llc -filetype=obj -mtriple mipsel-unknown-linux -mcpu=mips32r2 -relocation-model=static %s -o - | elf-dump --dump-section-data  | FileCheck -check-prefix=CHECK-BE32R2 %s
 ; RUN: llc -filetype=obj -mtriple mipsel-unknown-linux -mcpu=mips32r2 %s -o - | elf-dump --dump-section-data  | FileCheck -check-prefix=CHECK-BE32R2_PIC %s
+; RUN: llc -filetype=obj -mtriple mipsel-unknown-linux -mcpu=mips32r2 -mattr=+micromips -relocation-model=static %s -o - | elf-dump --dump-section-data  | FileCheck -check-prefix=CHECK-BE32R2-MICROMIPS %s
+; RUN: llc -filetype=obj -mtriple mipsel-unknown-linux -mcpu=mips32r2 -mattr=+micromips %s -o - | elf-dump --dump-section-data  | FileCheck -check-prefix=CHECK-BE32R2-MICROMIPS_PIC %s
 
 ; RUN: llc -filetype=obj -mtriple mipsel-unknown-linux -mcpu=mips64 -relocation-model=static %s -o - | elf-dump --dump-section-data  | FileCheck -check-prefix=CHECK-BE64 %s
 ; RUN: llc -filetype=obj -mtriple mipsel-unknown-linux -mcpu=mips64 %s -o - | elf-dump --dump-section-data  | FileCheck -check-prefix=CHECK-BE64_PIC %s
@@ -36,6 +38,12 @@
 ; 32R2 bit with NO_REORDER and PIC
 ; CHECK-BE32R2_PIC: ('e_flags', 0x70000003)
 ;
+; 32R2 bit MICROMIPS with NO_REORDER and static
+; CHECK-BE32R2-MICROMIPS: ('e_flags', 0x72000001)
+;
+; 32R2 bit MICROMIPS with NO_REORDER and PIC
+;CHECK-BE32R2-MICROMIPS_PIC:  ('e_flags', 0x72000003)
+;
 ; 64(R1) bit with NO_REORDER and static
 ; CHECK-BE64: ('e_flags', 0x60000001)
 ;