elf: add more ELFOSABI constants (gimli-rs#439)

Sourced from https://github.com/llvm/llvm-project/blob/902360d21dfb53b00fd2093488972bc422ae7941/llvm/include/llvm/BinaryFormat/ELF.h#L339-L368

crates/examples/src/readobj/elf.rs

@@ -795,13 +795,19 @@ static FLAGS_EI_OSABI: &[Flag<u8>] = &flags!(
     ELFOSABI_HPUX,
     ELFOSABI_NETBSD,
     ELFOSABI_GNU,
+    ELFOSABI_HURD,
     ELFOSABI_SOLARIS,
     ELFOSABI_AIX,
     ELFOSABI_IRIX,
     ELFOSABI_FREEBSD,
     ELFOSABI_TRU64,
     ELFOSABI_MODESTO,
     ELFOSABI_OPENBSD,
+    ELFOSABI_OPENVMS,
+    ELFOSABI_NSK,
+    ELFOSABI_AROS,
+    ELFOSABI_FENIXOS,
+    ELFOSABI_CLOUDABI,
     ELFOSABI_ARM_AEABI,
     ELFOSABI_ARM,
     ELFOSABI_STANDALONE,

src/elf.rs

@@ -162,6 +162,8 @@ pub const ELFOSABI_GNU: u8 = 3;
 ///
 /// Compatibility alias.
 pub const ELFOSABI_LINUX: u8 = ELFOSABI_GNU;
+/// GNU/Hurd.
+pub const ELFOSABI_HURD: u8 = 4;
 /// Sun Solaris.
 pub const ELFOSABI_SOLARIS: u8 = 6;
 /// IBM AIX.
@@ -176,6 +178,16 @@ pub const ELFOSABI_TRU64: u8 = 10;
 pub const ELFOSABI_MODESTO: u8 = 11;
 /// OpenBSD.
 pub const ELFOSABI_OPENBSD: u8 = 12;
+/// OpenVMS.
+pub const ELFOSABI_OPENVMS: u8 = 13;
+/// Hewlett-Packard Non-Stop Kernel.
+pub const ELFOSABI_NSK: u8 = 14;
+/// AROS
+pub const ELFOSABI_AROS: u8 = 15;
+/// FenixOS
+pub const ELFOSABI_FENIXOS: u8 = 16;
+/// Nuxi CloudABI
+pub const ELFOSABI_CLOUDABI: u8 = 17;
 /// ARM EABI.
 pub const ELFOSABI_ARM_AEABI: u8 = 64;
 /// ARM.