[llvm-objdump] Add support for the PT_OPENBSD_NOBTCFI segment type. (#67127)

Reference: https://github.com/openbsd/src/blob/master/sys/sys/exec_elf.h

Author: fcambus

llvm/test/tools/llvm-objdump/openbsd-headers.test

@@ -9,6 +9,8 @@
 # CHECK-NEXT:      filesz 0x0000000000000000 memsz 0x0000000000000000 flags ---
 # CHECK-NEXT: OPENBSD_WXNEEDED off    0x0000000000000000 vaddr 0x0000000000000000 paddr 0x0000000000000000 align 2**0
 # CHECK-NEXT:      filesz 0x0000000000000000 memsz 0x0000000000000000 flags ---
+# CHECK-NEXT: OPENBSD_NOBTCFI off    0x0000000000000000 vaddr 0x0000000000000000 paddr 0x0000000000000000 align 2**0
+# CHECK-NEXT:      filesz 0x0000000000000000 memsz 0x0000000000000000 flags ---
 # CHECK-NEXT: OPENBSD_BOOTDATA off    0x0000000000000000 vaddr 0x0000000000000000 paddr 0x0000000000000000 align 2**0
 # CHECK-NEXT:      filesz 0x0000000000000000 memsz 0x0000000000000000 flags ---
 
@@ -22,4 +24,5 @@ ProgramHeaders:
   - Type: 0x65a3dbe5 ## PT_OPENBSD_MUTABLE
   - Type: 0x65a3dbe6 ## PT_OPENBSD_RANDOMIZE
   - Type: 0x65a3dbe7 ## PT_OPENBSD_WXNEEDED
+  - Type: 0x65a3dbe8 ## PT_OPENBSD_NOBTCFI
   - Type: 0x65a41be6 ## PT_OPENBSD_BOOTDATA

llvm/tools/llvm-objdump/ELFDump.cpp

@@ -283,6 +283,9 @@ template <class ELFT> void ELFDumper<ELFT>::printProgramHeaders() {
     case ELF::PT_OPENBSD_MUTABLE:
       outs() << "OPENBSD_MUTABLE ";
       break;
+    case ELF::PT_OPENBSD_NOBTCFI:
+      outs() << "OPENBSD_NOBTCFI ";
+      break;
     case ELF::PT_OPENBSD_RANDOMIZE:
       outs() << "OPENBSD_RANDOMIZE ";
       break;