[llvm-objcopy] Add support for dynamic relocations

This change adds support for dynamic relocations (allocated
SHT_REL/SHT_RELA sections with a dynamic symbol table as their link).

The binary I added for the test is here:
https://drive.google.com/file/d/0B3gtIAmiMwZXSjJUZE9pUjd4M0k/view?usp=sharing

Unless support for dynamic symbol tables in yaml2obj is added this is
needed.

Differential Revision: https://reviews.llvm.org/D37915

llvm-svn: 314227

2 files changed, 19 insertions, 0 deletions

diff --git a/llvm/test/tools/llvm-objcopy/Inputs/dynrel.elf b/llvm/test/tools/llvm-objcopy/Inputs/dynrel.elf
new file mode 100644
index 00000000000..fe9d6835421
--- /dev/null
+++ b/llvm/test/tools/llvm-objcopy/Inputs/dynrel.elf
diff --git a/llvm/test/tools/llvm-objcopy/dynamic-relocations.test b/llvm/test/tools/llvm-objcopy/dynamic-relocations.test
new file mode 100644
index 00000000000..e544e2dd8ef
--- /dev/null
+++ b/llvm/test/tools/llvm-objcopy/dynamic-relocations.test
@@ -0,0 +1,19 @@
+# RUN: llvm-objcopy %p/Inputs/dynrel.elf %t
+# RUN: llvm-readobj -sections -section-data %t | FileCheck %s
+
+#CHECK:         Name: .rela.plt
+#CHECK-NEXT:    Type: SHT_RELA
+#CHECK-NEXT:    Flags [
+#CHECK-NEXT:      SHF_ALLOC
+#CHECK-NEXT:    ]
+#CHECK-NEXT:    Address:
+#CHECK-NEXT:    Offset:
+#CHECK-NEXT:    Size: 24
+#CHECK-NEXT:    Link:
+#CHECK-NEXT:    Info:
+#CHECK-NEXT:    AddressAlignment: 8
+#CHECK-NEXT:    EntrySize: 24
+#CHECK-NEXT:    SectionData (
+#CHECK-NEXT:       0000: 18202000 00000000 07000000 01000000  |.  .............|
+#CHECK-NEXT:       0010: 00000000 00000000                    |........|
+#CHECK-NEXT:    )