[PATCH] D52830: [ELF] - Set sh_info and sh_link for .rela.plt sections.

[George Rimar via Phabricator via llvm-commits]

grimar updated this revision to Diff 168253.
grimar edited the summary of this revision.
grimar added a comment.

- Addressed comments.


https://reviews.llvm.org/D52830

Files:
  ELF/SyntheticSections.cpp
  test/ELF/aarch64-gnu-ifunc.s
  test/ELF/dynamic-reloc.s
  test/ELF/gnu-ifunc-i386.s
  test/ELF/gnu-ifunc.s


Index: test/ELF/gnu-ifunc.s
===================================================================
--- test/ELF/gnu-ifunc.s
+++ test/ELF/gnu-ifunc.s
@@ -15,11 +15,16 @@
 // CHECK-NEXT:  Address: [[RELA:.*]]
 // CHECK-NEXT:  Offset: 0x158
 // CHECK-NEXT:  Size: 48
-// CHECK-NEXT:  Link: 0
-// CHECK-NEXT:  Info: 0
+// CHECK-NEXT:  Link: [[SYMTAB:.*]]
+// CHECK-NEXT:  Info: [[PLT:.*]]
 // CHECK-NEXT:  AddressAlignment: 8
 // CHECK-NEXT:  EntrySize: 24
 // CHECK-NEXT: }
+// CHECK:      Index: [[PLT]]
+// CHECK-NEXT: Name: .plt
+// CHECK:      Index: [[SYMTAB]]
+// CHECK-NEXT: Name: .symtab
+// CHECK-NEXT: Type: SHT_SYMTAB
 // CHECK:      Relocations [
 // CHECK-NEXT:   Section ({{.*}}) .rela.plt {
 // CHECK-NEXT:     0x202000 R_X86_64_IRELATIVE
Index: test/ELF/gnu-ifunc-i386.s
===================================================================
--- test/ELF/gnu-ifunc-i386.s
+++ test/ELF/gnu-ifunc-i386.s
@@ -15,8 +15,8 @@
 // CHECK-NEXT:  Address: [[RELA:.*]]
 // CHECK-NEXT:  Offset: 0xD4
 // CHECK-NEXT:  Size: 16
-// CHECK-NEXT:  Link: 0
-// CHECK-NEXT:  Info: 0
+// CHECK-NEXT:  Link: 6
+// CHECK-NEXT:  Info: 3
 // CHECK-NEXT:  AddressAlignment: 4
 // CHECK-NEXT:  EntrySize: 8
 // CHECK-NEXT: }
Index: test/ELF/dynamic-reloc.s
===================================================================
--- test/ELF/dynamic-reloc.s
+++ test/ELF/dynamic-reloc.s
@@ -18,7 +18,7 @@
 // CHECK-NEXT: Offset:
 // CHECK-NEXT: Size: [[RELASIZE:.*]]
 // CHECK-NEXT: Link: 1
-// CHECK-NEXT: Info: 0
+// CHECK-NEXT: Info: 6
 // CHECK-NEXT: AddressAlignment: 8
 // CHECK-NEXT: EntrySize: 24
 
Index: test/ELF/aarch64-gnu-ifunc.s
===================================================================
--- test/ELF/aarch64-gnu-ifunc.s
+++ test/ELF/aarch64-gnu-ifunc.s
@@ -15,8 +15,8 @@
 // CHECK-NEXT:  Address: [[RELA:.*]]
 // CHECK-NEXT:  Offset: 0x158
 // CHECK-NEXT:  Size: 48
-// CHECK-NEXT:  Link: 0
-// CHECK-NEXT:  Info: 0
+// CHECK-NEXT:  Link: 6
+// CHECK-NEXT:  Info: 3
 // CHECK-NEXT:  AddressAlignment: 8
 // CHECK-NEXT:  EntrySize: 24
 // CHECK-NEXT: }
Index: ELF/SyntheticSections.cpp
===================================================================
--- ELF/SyntheticSections.cpp
+++ ELF/SyntheticSections.cpp
@@ -1493,9 +1493,15 @@
 void RelocationBaseSection::finalizeContents() {
   // If all relocations are R_*_RELATIVE they don't refer to any
   // dynamic symbol and we don't need a dynamic symbol table. If that
-  // is the case, just use 0 as the link.
-  getParent()->Link =
-      In.DynSymTab ? In.DynSymTab->getParent()->SectionIndex : 0;
+  // is the case, just use the index of the regular symbol table section
+  // as the link to suppress the warnings reported by GNU tools like readelf.
+  getParent()->Link = In.DynSymTab ? In.DynSymTab->getParent()->SectionIndex
+                                   : In.SymTab->getParent()->SectionIndex;
+
+  if (In.RelaIplt == this)
+    getParent()->Info = In.Iplt->getParent()->SectionIndex;
+  else if (In.RelaPlt == this)
+    getParent()->Info = In.Plt->getParent()->SectionIndex;
 }
 
 RelrBaseSection::RelrBaseSection()


-------------- next part --------------
A non-text attachment was scrubbed...
Name: D52830.168253.patch
Type: text/x-patch
Size: 3088 bytes
Desc: not available
URL: <http://lists.llvm.org/pipermail/llvm-commits/attachments/20181004/d358609c/attachment.bin>