[ELF] Add support for CREL to getSectionAndRelocations

This patch updates the getSectionAndRelocations function to also support
CREL relocation sections. Unit tests have been added. This patch also
updates consumers to say they explicitly do not support CREL format
relocations. Subsequent patches will make the consumers work with CREL
format relocations and also add in testing support.

Reviewers: red1bluelost, MaskRay, rlavaee

Reviewed By: MaskRay

Pull Request: https://github.com/llvm/llvm-project/pull/126445

1 files changed, 9 insertions, 1 deletions

diff --git a/llvm/lib/Object/ELF.cpp b/llvm/lib/Object/ELF.cpp
index b6d0699..8cb3d7e 100644
--- a/llvm/lib/Object/ELF.cpp
+++ b/llvm/lib/Object/ELF.cpp
@@ -747,6 +747,13 @@ decodeBBAddrMapImpl(const ELFFile<ELFT> &EF,
     assert(RelaSec &&
            "Can't read a SHT_LLVM_BB_ADDR_MAP section in a relocatable "
            "object file without providing a relocation section.");
+    // We might end up with relocations in CREL here. If we do, return an
+    // error since we do not currently support them.
+    if (RelaSec->sh_type == ELF::SHT_CREL)
+      return createError("unable to read relocations for section " +
+                         describe(EF, Sec) +
+                         " as the corresponding relocation section format is "
+                         "CREL, which is not currently supported.");
     Expected<typename ELFFile<ELFT>::Elf_Rela_Range> Relas = EF.relas(*RelaSec);
     if (!Relas)
       return createError("unable to read relocations for section " +
@@ -958,7 +965,8 @@ ELFFile<ELFT>::getSectionAndRelocations(
         continue;
     }
 
-    if (Sec.sh_type != ELF::SHT_RELA && Sec.sh_type != ELF::SHT_REL)
+    if (Sec.sh_type != ELF::SHT_RELA && Sec.sh_type != ELF::SHT_REL &&
+        Sec.sh_type != ELF::SHT_CREL)
       continue;
 
     Expected<const Elf_Shdr *> RelSecOrErr = this->getSection(Sec.sh_info);