1 //===-- llvm/Target/ARMTargetObjectFile.cpp - ARM Object Info Impl --------===//
2 //
3 //                     The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 
10 #include "ARMTargetObjectFile.h"
11 #include "ARMSubtarget.h"
12 #include "llvm/MC/MCContext.h"
13 #include "llvm/MC/MCSectionELF.h"
14 #include "llvm/Support/Dwarf.h"
15 #include "llvm/Support/ELF.h"
16 #include "llvm/Target/TargetMachine.h"
17 #include "llvm/ADT/StringExtras.h"
18 using namespace llvm;
19 using namespace dwarf;
20 
21 //===----------------------------------------------------------------------===//
22 //                               ELF Target
23 //===----------------------------------------------------------------------===//
24 
25 void ARMElfTargetObjectFile::Initialize(MCContext &Ctx,
26                                         const TargetMachine &TM) {
27   TargetLoweringObjectFileELF::Initialize(Ctx, TM);
28   isAAPCS_ABI = TM.getSubtarget<ARMSubtarget>().isAAPCS_ABI();
29 
30   if (isAAPCS_ABI) {
31     StaticCtorSection =
32       getContext().getELFSection(".init_array", ELF::SHT_INIT_ARRAY,
33                                  ELF::SHF_WRITE |
34                                  ELF::SHF_ALLOC,
35                                  SectionKind::getDataRel());
36     StaticDtorSection =
37       getContext().getELFSection(".fini_array", ELF::SHT_FINI_ARRAY,
38                                  ELF::SHF_WRITE |
39                                  ELF::SHF_ALLOC,
40                                  SectionKind::getDataRel());
41     LSDASection = NULL;
42   }
43 
44   AttributesSection =
45     getContext().getELFSection(".ARM.attributes",
46                                ELF::SHT_ARM_ATTRIBUTES,
47                                0,
48                                SectionKind::getMetadata());
49 }
50 
51 const MCSection *
52 ARMElfTargetObjectFile::getStaticCtorSection(unsigned Priority) const {
53   if (!isAAPCS_ABI)
54     return TargetLoweringObjectFileELF::getStaticCtorSection(Priority);
55 
56   if (Priority == 65535)
57     return StaticCtorSection;
58 
59   // Emit ctors in priority order.
60   std::string Name = std::string(".init_array.") + utostr(Priority);
61   return getContext().getELFSection(Name, ELF::SHT_INIT_ARRAY,
62                                     ELF::SHF_ALLOC | ELF::SHF_WRITE,
63                                     SectionKind::getDataRel());
64 }
65 
66 const MCSection *
67 ARMElfTargetObjectFile::getStaticDtorSection(unsigned Priority) const {
68   if (!isAAPCS_ABI)
69     return TargetLoweringObjectFileELF::getStaticDtorSection(Priority);
70 
71   if (Priority == 65535)
72     return StaticDtorSection;
73 
74   // Emit dtors in priority order.
75   std::string Name = std::string(".fini_array.") + utostr(Priority);
76   return getContext().getELFSection(Name, ELF::SHT_FINI_ARRAY,
77                                     ELF::SHF_ALLOC | ELF::SHF_WRITE,
78                                     SectionKind::getDataRel());
79 }
80