Initial Xtensa support

src/common.rs

@@ -24,6 +24,7 @@ pub enum Architecture {
     S390x,
     Sparc64,
     Wasm32,
+    Xtensa,
 }
 
 impl Architecture {
@@ -52,6 +53,7 @@ impl Architecture {
             Architecture::S390x => Some(AddressSize::U64),
             Architecture::Sparc64 => Some(AddressSize::U64),
             Architecture::Wasm32 => Some(AddressSize::U32),
+            Architecture::Xtensa => Some(AddressSize::U32),
         }
     }
 }

src/elf.rs

@@ -6471,6 +6471,130 @@ pub const R_LARCH_32_PCREL: u32 = 99;
 /// insturction can be relaxed
 pub const R_LARCH_RELAX: u32 = 100;
 
+// Xtensa values Rel*::r_type`.
+#[allow(missing_docs)]
+pub const R_XTENSA_NONE: u32 = 0;
+#[allow(missing_docs)]
+pub const R_XTENSA_32: u32 = 1;
+#[allow(missing_docs)]
+pub const R_XTENSA_RTLD: u32 = 2;
+#[allow(missing_docs)]
+pub const R_XTENSA_GLOB_DAT: u32 = 3;
+#[allow(missing_docs)]
+pub const R_XTENSA_JMP_SLOT: u32 = 4;
+#[allow(missing_docs)]
+pub const R_XTENSA_RELATIVE: u32 = 5;
+#[allow(missing_docs)]
+pub const R_XTENSA_PLT: u32 = 6;
+#[allow(missing_docs)]
+pub const R_XTENSA_OP0: u32 = 8;
+#[allow(missing_docs)]
+pub const R_XTENSA_OP1: u32 = 9;
+#[allow(missing_docs)]
+pub const R_XTENSA_OP2: u32 = 10;
+#[allow(missing_docs)]
+pub const R_XTENSA_ASM_EXPAND: u32 = 11;
+#[allow(missing_docs)]
+pub const R_XTENSA_ASM_SIMPLIFY: u32 = 12;
+#[allow(missing_docs)]
+pub const R_XTENSA_32_PCREL: u32 = 14;
+#[allow(missing_docs)]
+pub const R_XTENSA_GNU_VTINHERIT: u32 = 15;
+#[allow(missing_docs)]
+pub const R_XTENSA_GNU_VTENTRY: u32 = 16;
+#[allow(missing_docs)]
+pub const R_XTENSA_DIFF8: u32 = 17;
+#[allow(missing_docs)]
+pub const R_XTENSA_DIFF16: u32 = 18;
+#[allow(missing_docs)]
+pub const R_XTENSA_DIFF32: u32 = 19;
+#[allow(missing_docs)]
+pub const R_XTENSA_SLOT0_OP: u32 = 20;
+#[allow(missing_docs)]
+pub const R_XTENSA_SLOT1_OP: u32 = 21;
+#[allow(missing_docs)]
+pub const R_XTENSA_SLOT2_OP: u32 = 22;
+#[allow(missing_docs)]
+pub const R_XTENSA_SLOT3_OP: u32 = 23;
+#[allow(missing_docs)]
+pub const R_XTENSA_SLOT4_OP: u32 = 24;
+#[allow(missing_docs)]
+pub const R_XTENSA_SLOT5_OP: u32 = 25;
+#[allow(missing_docs)]
+pub const R_XTENSA_SLOT6_OP: u32 = 26;
+#[allow(missing_docs)]
+pub const R_XTENSA_SLOT7_OP: u32 = 27;
+#[allow(missing_docs)]
+pub const R_XTENSA_SLOT8_OP: u32 = 28;
+#[allow(missing_docs)]
+pub const R_XTENSA_SLOT9_OP: u32 = 29;
+#[allow(missing_docs)]
+pub const R_XTENSA_SLOT10_OP: u32 = 30;
+#[allow(missing_docs)]
+pub const R_XTENSA_SLOT11_OP: u32 = 31;
+#[allow(missing_docs)]
+pub const R_XTENSA_SLOT12_OP: u32 = 32;
+#[allow(missing_docs)]
+pub const R_XTENSA_SLOT13_OP: u32 = 33;
+#[allow(missing_docs)]
+pub const R_XTENSA_SLOT14_OP: u32 = 34;
+#[allow(missing_docs)]
+pub const R_XTENSA_SLOT0_ALT: u32 = 35;
+#[allow(missing_docs)]
+pub const R_XTENSA_SLOT1_ALT: u32 = 36;
+#[allow(missing_docs)]
+pub const R_XTENSA_SLOT2_ALT: u32 = 37;
+#[allow(missing_docs)]
+pub const R_XTENSA_SLOT3_ALT: u32 = 38;
+#[allow(missing_docs)]
+pub const R_XTENSA_SLOT4_ALT: u32 = 39;
+#[allow(missing_docs)]
+pub const R_XTENSA_SLOT5_ALT: u32 = 40;
+#[allow(missing_docs)]
+pub const R_XTENSA_SLOT6_ALT: u32 = 41;
+#[allow(missing_docs)]
+pub const R_XTENSA_SLOT7_ALT: u32 = 42;
+#[allow(missing_docs)]
+pub const R_XTENSA_SLOT8_ALT: u32 = 43;
+#[allow(missing_docs)]
+pub const R_XTENSA_SLOT9_ALT: u32 = 44;
+#[allow(missing_docs)]
+pub const R_XTENSA_SLOT10_ALT: u32 = 45;
+#[allow(missing_docs)]
+pub const R_XTENSA_SLOT11_ALT: u32 = 46;
+#[allow(missing_docs)]
+pub const R_XTENSA_SLOT12_ALT: u32 = 47;
+#[allow(missing_docs)]
+pub const R_XTENSA_SLOT13_ALT: u32 = 48;
+#[allow(missing_docs)]
+pub const R_XTENSA_SLOT14_ALT: u32 = 49;
+#[allow(missing_docs)]
+pub const R_XTENSA_TLSDESC_FN: u32 = 50;
+#[allow(missing_docs)]
+pub const R_XTENSA_TLSDESC_ARG: u32 = 51;
+#[allow(missing_docs)]
+pub const R_XTENSA_TLS_DTPOFF: u32 = 52;
+#[allow(missing_docs)]
+pub const R_XTENSA_TLS_TPOFF: u32 = 53;
+#[allow(missing_docs)]
+pub const R_XTENSA_TLS_FUNC: u32 = 54;
+#[allow(missing_docs)]
+pub const R_XTENSA_TLS_ARG: u32 = 55;
+#[allow(missing_docs)]
+pub const R_XTENSA_TLS_CALL: u32 = 56;
+#[allow(missing_docs)]
+pub const R_XTENSA_PDIFF8: u32 = 57;
+#[allow(missing_docs)]
+pub const R_XTENSA_PDIFF16: u32 = 58;
+#[allow(missing_docs)]
+pub const R_XTENSA_PDIFF32: u32 = 59;
+#[allow(missing_docs)]
+pub const R_XTENSA_NDIFF8: u32 = 60;
+#[allow(missing_docs)]
+pub const R_XTENSA_NDIFF16: u32 = 61;
+#[allow(missing_docs)]
+pub const R_XTENSA_NDIFF32: u32 = 62;
+
 unsafe_impl_endian_pod!(
     FileHeader32,
     FileHeader64,

src/read/elf/file.rs

@@ -176,6 +176,7 @@ where
             // We only support the 64-bit variant s390x here.
             (elf::EM_S390, true) => Architecture::S390x,
             (elf::EM_SPARCV9, true) => Architecture::Sparc64,
+            (elf::EM_XTENSA, false) => Architecture::Xtensa,
             _ => Architecture::Unknown,
         }
     }

src/read/elf/relocation.rs

@@ -392,6 +392,11 @@ fn parse_relocation<Elf: FileHeader>(
                 r_type => (RelocationKind::Elf(r_type), 0),
             }
         }
+        elf::EM_XTENSA => match reloc.r_type(endian, false) {
+            elf::R_XTENSA_32 => (RelocationKind::Absolute, 32),
+            elf::R_XTENSA_32_PCREL => (RelocationKind::Relative, 32),
+            r_type => (RelocationKind::Elf(r_type), 0),
+        },
         _ => (RelocationKind::Elf(reloc.r_type(endian, false)), 0),
     };
     let sym = reloc.r_sym(endian, is_mips64el) as usize;

src/write/elf/object.rs

@@ -84,6 +84,7 @@ impl<'a> Object<'a> {
             Architecture::Riscv32 => true,
             Architecture::S390x => true,
             Architecture::Sparc64 => true,
+            Architecture::Xtensa => true,
             _ => {
                 return Err(Error(format!(
                     "unimplemented architecture {:?}",
@@ -281,6 +282,7 @@ impl<'a> Object<'a> {
             Architecture::Riscv64 => elf::EM_RISCV,
             Architecture::S390x => elf::EM_S390,
             Architecture::Sparc64 => elf::EM_SPARCV9,
+            Architecture::Xtensa => elf::EM_XTENSA,
             _ => {
                 return Err(Error(format!(
                     "unimplemented architecture {:?}",
@@ -680,6 +682,16 @@ impl<'a> Object<'a> {
                                 return Err(Error(format!("unimplemented relocation {:?}", reloc)));
                             }
                         },
+                        Architecture::Xtensa => match (reloc.kind, reloc.encoding, reloc.size) {
+                            (RelocationKind::Absolute, _, 32) => elf::R_XTENSA_32,
+                            (RelocationKind::Relative, RelocationEncoding::Generic, 32) => {
+                                elf::R_XTENSA_32_PCREL
+                            }
+                            (RelocationKind::Elf(x), _, _) => x,
+                            _ => {
+                                return Err(Error(format!("unimplemented relocation {:?}", reloc)));
+                            }
+                        },
                         _ => {
                             if let RelocationKind::Elf(x) = reloc.kind {
                                 x

tests/round_trip/mod.rs

@@ -248,6 +248,7 @@ fn elf_any() {
         (Architecture::Riscv64, Endianness::Little),
         (Architecture::S390x, Endianness::Big),
         (Architecture::Sparc64, Endianness::Big),
+        (Architecture::Xtensa, Endianness::Little),
     ]
     .iter()
     .copied()