[ARM] Set specific flags in ELF header

llvm-svn: 233799

lld/lib/ReaderWriter/ELF/ARM/ARMExecutableWriter.h

@@ -13,6 +13,7 @@
 #include "ARMLinkingContext.h"
 #include "ARMTargetHandler.h"
 #include "ARMSymbolTable.h"
+#include "llvm/Support/ELF.h"
 
 namespace {
 const char *gotSymbol = "_GLOBAL_OFFSET_TABLE_";
@@ -101,6 +102,10 @@ std::error_code ARMExecutableWriter<ELFT>::setELFHeader() {
   if (std::error_code ec = ExecutableWriter<ELFT>::setELFHeader())
     return ec;
 
+  // Set ARM-specific flags.
+  this->_elfHeader->e_flags(llvm::ELF::EF_ARM_EABI_VER5 |
+                            llvm::ELF::EF_ARM_VFP_FLOAT);
+
   StringRef entryName = _ctx.entrySymbolName();
   if (const AtomLayout *al = _armLayout.findAtomLayoutByName(entryName)) {
     if (const auto *ea = dyn_cast<DefinedAtom>(al->_atom)) {

lld/test/elf/ARM/header-flags.test

@@ -0,0 +1,40 @@
+# Various checks for header flags.
+
+# 1. Check header flags for statically linked executable with default options.
+# RUN: yaml2obj -format=elf %s > %t.o
+# RUN: lld -flavor gnu -target arm -m armelf_linux_eabi -Bstatic \
+# RUN: --noinhibit-exec %t.o -o %t
+# RUN: llvm-readobj -file-headers %t | FileCheck -check-prefix=STATIC-DEF %s
+#
+# STATIC-DEF: Flags {{.}} (0x5000400)
+#   ABI version 5 + hard float ^^
+
+---
+FileHeader:
+  Class:           ELFCLASS32
+  Data:            ELFDATA2LSB
+  Type:            ET_REL
+  Machine:         EM_ARM
+  Flags:           [ EF_ARM_EABI_VER5 ]
+Sections:
+  - Name:            .text
+    Type:            SHT_PROGBITS
+    Flags:           [ SHF_ALLOC, SHF_EXECINSTR ]
+    AddressAlign:    0x0000000000000004
+    Content:         04B02DE500B08DE20030A0E30300A0E100D04BE204B09DE41EFF2FE1
+  - Name:            .data
+    Type:            SHT_PROGBITS
+    Flags:           [ SHF_WRITE, SHF_ALLOC ]
+    AddressAlign:    0x0000000000000001
+    Content:         ''
+  - Name:            .bss
+    Type:            SHT_NOBITS
+    Flags:           [ SHF_WRITE, SHF_ALLOC ]
+    AddressAlign:    0x0000000000000001
+    Content:         ''
+Symbols:
+  Global:
+    - Name:            main
+      Type:            STT_FUNC
+      Section:         .text
+...