Add LoongArch32 ELF basic support (gimli-rs#765)

Author: heiher

src/common.rs

@@ -18,6 +18,7 @@ pub enum Architecture {
     #[allow(non_camel_case_types)]
     X86_64_X32,
     Hexagon,
+    LoongArch32,
     LoongArch64,
     M68k,
     Mips,
@@ -69,6 +70,7 @@ impl Architecture {
             Architecture::X86_64 => Some(AddressSize::U64),
             Architecture::X86_64_X32 => Some(AddressSize::U32),
             Architecture::Hexagon => Some(AddressSize::U32),
+            Architecture::LoongArch32 => Some(AddressSize::U32),
             Architecture::LoongArch64 => Some(AddressSize::U64),
             Architecture::M68k => Some(AddressSize::U32),
             Architecture::Mips => Some(AddressSize::U32),

src/read/elf/file.rs

@@ -255,6 +255,7 @@ where
             (elf::EM_X86_64, false) => Architecture::X86_64_X32,
             (elf::EM_X86_64, true) => Architecture::X86_64,
             (elf::EM_HEXAGON, _) => Architecture::Hexagon,
+            (elf::EM_LOONGARCH, false) => Architecture::LoongArch32,
             (elf::EM_LOONGARCH, true) => Architecture::LoongArch64,
             (elf::EM_68K, false) => Architecture::M68k,
             (elf::EM_MIPS, false) => {

src/write/elf/object.rs

@@ -134,6 +134,7 @@ impl<'a> Object<'a> {
             Architecture::X86_64 => true,
             Architecture::X86_64_X32 => true,
             Architecture::Hexagon => true,
+            Architecture::LoongArch32 => true,
             Architecture::LoongArch64 => true,
             Architecture::M68k => true,
             Architecture::Mips => false,
@@ -252,7 +253,7 @@ impl<'a> Object<'a> {
                 (K::Absolute, _, 32) => elf::R_HEX_32,
                 _ => return unsupported_reloc(),
             },
-            Architecture::LoongArch64 => match (kind, encoding, size) {
+            Architecture::LoongArch32 | Architecture::LoongArch64 => match (kind, encoding, size) {
                 (K::Absolute, _, 32) => elf::R_LARCH_32,
                 (K::Absolute, _, 64) => elf::R_LARCH_64,
                 (K::Relative, _, 32) => elf::R_LARCH_32_PCREL,
@@ -572,6 +573,7 @@ impl<'a> Object<'a> {
             (Architecture::X86_64, None) => elf::EM_X86_64,
             (Architecture::X86_64_X32, None) => elf::EM_X86_64,
             (Architecture::Hexagon, None) => elf::EM_HEXAGON,
+            (Architecture::LoongArch32, None) => elf::EM_LOONGARCH,
             (Architecture::LoongArch64, None) => elf::EM_LOONGARCH,
             (Architecture::M68k, None) => elf::EM_68K,
             (Architecture::Mips, None) => elf::EM_MIPS,

tests/round_trip/mod.rs

@@ -271,6 +271,7 @@ fn elf_any() {
         (Architecture::X86_64, Endianness::Little),
         (Architecture::X86_64_X32, Endianness::Little),
         (Architecture::Hexagon, Endianness::Little),
+        (Architecture::LoongArch32, Endianness::Little),
         (Architecture::LoongArch64, Endianness::Little),
         (Architecture::M68k, Endianness::Big),
         (Architecture::Mips, Endianness::Little),