diff --git a/src/common.rs b/src/common.rs
index 864e9292..872cc6ce 100644
--- a/src/common.rs
+++ b/src/common.rs
@@ -7,8 +7,13 @@ pub enum Architecture {
     Arm,
     I386,
     Mips,
+    Mips64,
     S390x,
     Wasm32,
+    PowerPc,
+    PowerPc64,
+    Riscv32,
+    Riscv64,
     X86_64,
 }
 
@@ -23,9 +28,14 @@ impl Architecture {
             Architecture::Arm => Some(AddressSize::U32),
             Architecture::I386 => Some(AddressSize::U32),
             Architecture::Mips => Some(AddressSize::U32),
+            Architecture::Mips64 => Some(AddressSize::U64),
             Architecture::S390x => Some(AddressSize::U64),
             Architecture::Wasm32 => Some(AddressSize::U32),
             Architecture::X86_64 => Some(AddressSize::U64),
+            Architecture::PowerPc => Some(AddressSize::U32),
+            Architecture::PowerPc64 => Some(AddressSize::U64),
+            Architecture::Riscv64 => Some(AddressSize::U64),
+            Architecture::Riscv32 => Some(AddressSize::U32),
         }
     }
 }
diff --git a/src/elf.rs b/src/elf.rs
index 69e7d109..249ce8da 100644
--- a/src/elf.rs
+++ b/src/elf.rs
@@ -735,6 +735,8 @@ pub const SHF_COMPRESSED: u32 = 1 << 11;
 pub const SHF_MASKOS: u32 = 0x0ff0_0000;
 /// Processor-specific section flags.
 pub const SHF_MASKPROC: u32 = 0xf000_0000;
+/// This section is excluded from the final executable or shared library.
+pub const SHF_EXCLUDE: u32 = 0x8000_0000;
 
 /// Section compression header.
 ///
diff --git a/src/write/elf.rs b/src/write/elf.rs
index d3ce541e..e93a193b 100644
--- a/src/write/elf.rs
+++ b/src/write/elf.rs
@@ -77,6 +77,11 @@ impl Object {
             Architecture::X86_64 => true,
             Architecture::S390x => true,
             Architecture::Mips => false,
+            Architecture::Mips64 => false,
+            Architecture::PowerPc => false,
+            Architecture::PowerPc64 => false,
+            Architecture::Riscv64 => false,
+            Architecture::Riscv32 => false,
             _ => {
                 return Err(Error(format!(
                     "unimplemented architecture {:?}",
@@ -349,6 +354,11 @@ impl Object {
             Architecture::X86_64 => elf::EM_X86_64,
             Architecture::S390x => elf::EM_S390,
             Architecture::Mips => elf::EM_MIPS,
+            Architecture::Mips64 => elf::EM_MIPS,
+            Architecture::PowerPc => elf::EM_PPC,
+            Architecture::PowerPc64 => elf::EM_PPC64,
+            Architecture::Riscv64 => elf::EM_RISCV,
+            Architecture::Riscv32 => elf::EM_RISCV,
             _ => {
                 return Err(Error(format!(
                     "unimplemented architecture {:?}",