From ce02cf0099e912e31300d58477d65ae26ea13ef8 Mon Sep 17 00:00:00 2001
From: Simon Atanasyan <simon@atanasyan.com>
Date: Wed, 9 Nov 2016 21:36:56 +0000
Subject: [ELF][MIPS] Convert .reginfo and .MIPS.options sections to synthetic
 input sections

Previously, we have both input and output sections for .reginfo and
.MIPS.options. Now for each such sections we have one synthetic input
sections: MipsReginfoSection and MipsOptionsSection respectively.

Both sections are handled as regular sections until the control reaches
Writer. Writer then aggregates all sections whose type is SHT_MIPS_REGINFO
or SHT_MIPS_OPTIONS to create a single synthesized input section. In that
moment Writer also save GP0 value to the MipsGp0 field of the corresponding
ObjectFile. This value required for R_MIPS_GPREL16 and R_MIPS_GPREL32
relocations calculation.

Differential revision: https://reviews.llvm.org/D26444

llvm-svn: 286397
---
 lld/ELF/OutputSections.cpp | 79 +++-------------------------------------------
 1 file changed, 5 insertions(+), 74 deletions(-)

(limited to 'lld/ELF/OutputSections.cpp')

diff --git a/lld/ELF/OutputSections.cpp b/lld/ELF/OutputSections.cpp
index c8c622ca495..45587d0a49e 100644
--- a/lld/ELF/OutputSections.cpp
+++ b/lld/ELF/OutputSections.cpp
@@ -913,6 +913,11 @@ OutputSection<ELFT>::OutputSection(StringRef Name, uint32_t Type, uintX_t Flags)
     this->Entsize = sizeof(Elf_Rela);
   else if (Type == SHT_REL)
     this->Entsize = sizeof(Elf_Rel);
+  else if (Type == SHT_MIPS_REGINFO)
+    this->Entsize = sizeof(Elf_Mips_RegInfo<ELFT>);
+  else if (Type == SHT_MIPS_OPTIONS)
+    this->Entsize =
+        sizeof(Elf_Mips_Options<ELFT>) + sizeof(Elf_Mips_RegInfo<ELFT>);
 }
 
 template <class ELFT> void OutputSection<ELFT>::finalize() {
@@ -1724,64 +1729,6 @@ template <class ELFT> void VersionNeedSection<ELFT>::finalize() {
   this->Size = Size;
 }
 
-template <class ELFT>
-MipsReginfoOutputSection<ELFT>::MipsReginfoOutputSection()
-    : OutputSectionBase<ELFT>(".reginfo", SHT_MIPS_REGINFO, SHF_ALLOC) {
-  this->Addralign = 4;
-  this->Entsize = sizeof(Elf_Mips_RegInfo);
-  this->Size = sizeof(Elf_Mips_RegInfo);
-}
-
-template <class ELFT>
-void MipsReginfoOutputSection<ELFT>::writeTo(uint8_t *Buf) {
-  auto *R = reinterpret_cast<Elf_Mips_RegInfo *>(Buf);
-  if (Config->Relocatable)
-    R->ri_gp_value = 0;
-  else
-    R->ri_gp_value = Out<ELFT>::Got->Addr + MipsGPOffset;
-  R->ri_gprmask = GprMask;
-}
-
-template <class ELFT>
-void MipsReginfoOutputSection<ELFT>::addSection(InputSectionBase<ELFT> *C) {
-  // Copy input object file's .reginfo gprmask to output.
-  auto *S = cast<MipsReginfoInputSection<ELFT>>(C);
-  GprMask |= S->Reginfo->ri_gprmask;
-  S->OutSec = this;
-}
-
-template <class ELFT>
-MipsOptionsOutputSection<ELFT>::MipsOptionsOutputSection()
-    : OutputSectionBase<ELFT>(".MIPS.options", SHT_MIPS_OPTIONS,
-                              SHF_ALLOC | SHF_MIPS_NOSTRIP) {
-  this->Addralign = 8;
-  this->Entsize = 1;
-  this->Size = sizeof(Elf_Mips_Options) + sizeof(Elf_Mips_RegInfo);
-}
-
-template <class ELFT>
-void MipsOptionsOutputSection<ELFT>::writeTo(uint8_t *Buf) {
-  auto *Opt = reinterpret_cast<Elf_Mips_Options *>(Buf);
-  Opt->kind = ODK_REGINFO;
-  Opt->size = this->Size;
-  Opt->section = 0;
-  Opt->info = 0;
-  auto *Reg = reinterpret_cast<Elf_Mips_RegInfo *>(Buf + sizeof(*Opt));
-  if (Config->Relocatable)
-    Reg->ri_gp_value = 0;
-  else
-    Reg->ri_gp_value = Out<ELFT>::Got->Addr + MipsGPOffset;
-  Reg->ri_gprmask = GprMask;
-}
-
-template <class ELFT>
-void MipsOptionsOutputSection<ELFT>::addSection(InputSectionBase<ELFT> *C) {
-  auto *S = cast<MipsOptionsInputSection<ELFT>>(C);
-  if (S->Reginfo)
-    GprMask |= S->Reginfo->ri_gprmask;
-  S->OutSec = this;
-}
-
 template <class ELFT>
 MipsAbiFlagsOutputSection<ELFT>::MipsAbiFlagsOutputSection()
     : OutputSectionBase<ELFT>(".MIPS.abiflags", SHT_MIPS_ABIFLAGS, SHF_ALLOC) {
@@ -1876,12 +1823,6 @@ OutputSectionFactory<ELFT>::create(const SectionKey<ELFT::Is64Bits> &Key,
   case InputSectionBase<ELFT>::Merge:
     Sec = make<MergeOutputSection<ELFT>>(Key.Name, Type, Flags, Key.Alignment);
     break;
-  case InputSectionBase<ELFT>::MipsReginfo:
-    Sec = make<MipsReginfoOutputSection<ELFT>>();
-    break;
-  case InputSectionBase<ELFT>::MipsOptions:
-    Sec = make<MipsOptionsOutputSection<ELFT>>();
-    break;
   case InputSectionBase<ELFT>::MipsAbiFlags:
     Sec = make<MipsAbiFlagsOutputSection<ELFT>>();
     break;
@@ -1978,16 +1919,6 @@ template class EhOutputSection<ELF32BE>;
 template class EhOutputSection<ELF64LE>;
 template class EhOutputSection<ELF64BE>;
 
-template class MipsReginfoOutputSection<ELF32LE>;
-template class MipsReginfoOutputSection<ELF32BE>;
-template class MipsReginfoOutputSection<ELF64LE>;
-template class MipsReginfoOutputSection<ELF64BE>;
-
-template class MipsOptionsOutputSection<ELF32LE>;
-template class MipsOptionsOutputSection<ELF32BE>;
-template class MipsOptionsOutputSection<ELF64LE>;
-template class MipsOptionsOutputSection<ELF64BE>;
-
 template class MipsAbiFlagsOutputSection<ELF32LE>;
 template class MipsAbiFlagsOutputSection<ELF32BE>;
 template class MipsAbiFlagsOutputSection<ELF64LE>;
-- 
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