Move all architecture-specific code into modules

No more scattered relocation handling and
feature checks. Everything will go through
the ObjArch trait, which makes it easier
to add new architectures going forward.

objdiff-core/Cargo.toml

@@ -14,7 +14,7 @@ A local diffing tool for decompilation projects.
 [features]
 all = ["config", "dwarf", "mips", "ppc", "x86"]
 any-arch = [] # Implicit, used to check if any arch is enabled
-config = []
+config = ["globset", "semver", "serde_json", "serde_yaml"]
 dwarf = ["gimli"]
 mips = ["any-arch", "rabbitizer"]
 ppc = ["any-arch", "cwdemangle", "ppc750cl"]
@@ -23,30 +23,35 @@ x86 = ["any-arch", "iced-x86", "msvc-demangler"]
 [dependencies]
 anyhow = "1.0.81"
 byteorder = "1.5.0"
-cwdemangle = { version = "1.0.0", optional = true }
 filetime = "0.2.23"
 flagset = "0.4.5"
-gimli = { version = "0.28.1", default-features = false, features = ["read-all"], optional = true }
 log = "0.4.21"
 memmap2 = "0.9.4"
 num-traits = "0.2.18"
 object = { version = "0.34.0", features = ["read_core", "std", "elf", "pe"], default-features = false }
-ppc750cl = { git = "https://github.com/encounter/ppc750cl", rev = "4a2bbbc6f84dcb76255ab6f3595a8d4a0ce96618", optional = true }
-rabbitizer = { version = "1.9.2", optional = true }
 serde = { version = "1", features = ["derive"] }
 similar = { version = "2.4.0", default-features = false }
 
 # config
-globset = { version = "0.4.14", features = ["serde1"] }
-semver = "1.0.22"
-serde_json = "1.0.114"
-serde_yaml = "0.9.32"
+globset = { version = "0.4.14", features = ["serde1"], optional = true }
+semver = { version = "1.0.22", optional = true }
+serde_json = { version = "1.0.114", optional = true }
+serde_yaml = { version = "0.9.32", optional = true }
+
+# dwarf
+gimli = { version = "0.28.1", default-features = false, features = ["read-all"], optional = true }
+
+# ppc
+cwdemangle = { version = "1.0.0", optional = true }
+ppc750cl = { git = "https://github.com/encounter/ppc750cl", rev = "4a2bbbc6f84dcb76255ab6f3595a8d4a0ce96618", optional = true }
+
+# mips
+rabbitizer = { version = "1.9.2", optional = true }
 
 # x86
 msvc-demangler = { version = "0.10.0", optional = true }
 [dependencies.iced-x86]
 version = "1.21.0"
-#default-features = false
-#features = ["std", "decoder", "intel"]
-features = ["exhaustive_enums"]
+default-features = false
+features = ["std", "decoder", "intel", "gas", "masm", "nasm", "exhaustive_enums"]
 optional = true

objdiff-core/src/arch/mips.rs

@@ -0,0 +1,207 @@
+use std::{borrow::Cow, collections::BTreeMap};
+
+use anyhow::{bail, Result};
+use object::{elf, Endian, Endianness, File, Object, Relocation, RelocationFlags};
+use rabbitizer::{config, Abi, InstrCategory, Instruction, OperandType};
+
+use crate::{
+    arch::ObjArch,
+    diff::{DiffObjConfig, ProcessCodeResult},
+    obj::{ObjIns, ObjInsArg, ObjInsArgValue, ObjReloc, ObjSection},
+};
+
+fn configure_rabbitizer() {
+    unsafe {
+        config::RabbitizerConfig_Cfg.reg_names.fpr_abi_names = Abi::O32;
+    }
+}
+
+pub struct ObjArchMips {
+    pub endianness: Endianness,
+}
+
+impl ObjArchMips {
+    pub fn new(object: &File) -> Result<Self> { Ok(Self { endianness: object.endianness() }) }
+}
+
+impl ObjArch for ObjArchMips {
+    fn process_code(
+        &self,
+        config: &DiffObjConfig,
+        data: &[u8],
+        start_address: u64,
+        relocs: &[ObjReloc],
+        line_info: &Option<BTreeMap<u64, u64>>,
+    ) -> Result<ProcessCodeResult> {
+        configure_rabbitizer();
+
+        let end_address = start_address + data.len() as u64;
+        let ins_count = data.len() / 4;
+        let mut ops = Vec::<u16>::with_capacity(ins_count);
+        let mut insts = Vec::<ObjIns>::with_capacity(ins_count);
+        let mut cur_addr = start_address as u32;
+        for chunk in data.chunks_exact(4) {
+            let reloc = relocs.iter().find(|r| (r.address as u32 & !3) == cur_addr);
+            let code = self.endianness.read_u32_bytes(chunk.try_into()?);
+            let instruction = Instruction::new(code, cur_addr, InstrCategory::CPU);
+
+            let op = instruction.unique_id as u16;
+            ops.push(op);
+
+            let mnemonic = instruction.opcode_name().to_string();
+            let is_branch = instruction.is_branch();
+            let branch_offset = instruction.branch_offset();
+            let branch_dest = if is_branch {
+                cur_addr.checked_add_signed(branch_offset).map(|a| a as u64)
+            } else {
+                None
+            };
+
+            let operands = instruction.get_operands_slice();
+            let mut args = Vec::with_capacity(operands.len() + 1);
+            for (idx, op) in operands.iter().enumerate() {
+                if idx > 0 {
+                    if config.space_between_args {
+                        args.push(ObjInsArg::PlainText(", ".to_string()));
+                    } else {
+                        args.push(ObjInsArg::PlainText(",".to_string()));
+                    }
+                }
+
+                match op {
+                    OperandType::cpu_immediate
+                    | OperandType::cpu_label
+                    | OperandType::cpu_branch_target_label => {
+                        if let Some(branch_dest) = branch_dest {
+                            args.push(ObjInsArg::BranchDest(branch_dest));
+                        } else if let Some(reloc) = reloc {
+                            if matches!(&reloc.target_section, Some(s) if s == ".text")
+                                && reloc.target.address > start_address
+                                && reloc.target.address < end_address
+                            {
+                                args.push(ObjInsArg::BranchDest(reloc.target.address));
+                            } else {
+                                push_reloc(&mut args, reloc)?;
+                            }
+                        } else {
+                            args.push(ObjInsArg::Arg(ObjInsArgValue::Opaque(
+                                op.disassemble(&instruction, None),
+                            )));
+                        }
+                    }
+                    OperandType::cpu_immediate_base => {
+                        if let Some(reloc) = reloc {
+                            push_reloc(&mut args, reloc)?;
+                        } else {
+                            args.push(ObjInsArg::Arg(ObjInsArgValue::Opaque(
+                                OperandType::cpu_immediate.disassemble(&instruction, None),
+                            )));
+                        }
+                        args.push(ObjInsArg::PlainText("(".to_string()));
+                        args.push(ObjInsArg::Arg(ObjInsArgValue::Opaque(
+                            OperandType::cpu_rs.disassemble(&instruction, None),
+                        )));
+                        args.push(ObjInsArg::PlainText(")".to_string()));
+                    }
+                    _ => {
+                        args.push(ObjInsArg::Arg(ObjInsArgValue::Opaque(
+                            op.disassemble(&instruction, None),
+                        )));
+                    }
+                }
+            }
+            let line = line_info
+                .as_ref()
+                .and_then(|map| map.range(..=cur_addr as u64).last().map(|(_, &b)| b));
+            insts.push(ObjIns {
+                address: cur_addr as u64,
+                size: 4,
+                op,
+                mnemonic,
+                args,
+                reloc: reloc.cloned(),
+                branch_dest,
+                line,
+                orig: None,
+            });
+            cur_addr += 4;
+        }
+        Ok(ProcessCodeResult { ops, insts })
+    }
+
+    fn implcit_addend(
+        &self,
+        section: &ObjSection,
+        address: u64,
+        reloc: &Relocation,
+    ) -> Result<i64> {
+        let data = section.data[address as usize..address as usize + 4].try_into()?;
+        let addend = self.endianness.read_u32_bytes(data);
+        Ok(match reloc.flags() {
+            RelocationFlags::Elf { r_type: elf::R_MIPS_32 } => addend as i64,
+            RelocationFlags::Elf { r_type: elf::R_MIPS_HI16 } => {
+                ((addend & 0x0000FFFF) << 16) as i32 as i64
+            }
+            RelocationFlags::Elf {
+                r_type:
+                    elf::R_MIPS_LO16 | elf::R_MIPS_GOT16 | elf::R_MIPS_CALL16 | elf::R_MIPS_GPREL16,
+            } => (addend & 0x0000FFFF) as i16 as i64,
+            RelocationFlags::Elf { r_type: elf::R_MIPS_26 } => ((addend & 0x03FFFFFF) << 2) as i64,
+            flags => bail!("Unsupported MIPS implicit relocation {flags:?}"),
+        })
+    }
+
+    fn display_reloc(&self, flags: RelocationFlags) -> Cow<'static, str> {
+        match flags {
+            RelocationFlags::Elf { r_type } => match r_type {
+                elf::R_MIPS_HI16 => Cow::Borrowed("R_MIPS_HI16"),
+                elf::R_MIPS_LO16 => Cow::Borrowed("R_MIPS_LO16"),
+                elf::R_MIPS_GOT16 => Cow::Borrowed("R_MIPS_GOT16"),
+                elf::R_MIPS_CALL16 => Cow::Borrowed("R_MIPS_CALL16"),
+                elf::R_MIPS_GPREL16 => Cow::Borrowed("R_MIPS_GPREL16"),
+                elf::R_MIPS_32 => Cow::Borrowed("R_MIPS_32"),
+                elf::R_MIPS_26 => Cow::Borrowed("R_MIPS_26"),
+                _ => Cow::Owned(format!("<Elf {r_type:?}>")),
+            },
+            flags => Cow::Owned(format!("<{flags:?}>")),
+        }
+    }
+}
+
+fn push_reloc(args: &mut Vec<ObjInsArg>, reloc: &ObjReloc) -> Result<()> {
+    match reloc.flags {
+        RelocationFlags::Elf { r_type } => match r_type {
+            elf::R_MIPS_HI16 => {
+                args.push(ObjInsArg::PlainText("%hi(".to_string()));
+                args.push(ObjInsArg::Reloc);
+                args.push(ObjInsArg::PlainText(")".to_string()));
+            }
+            elf::R_MIPS_LO16 => {
+                args.push(ObjInsArg::PlainText("%lo(".to_string()));
+                args.push(ObjInsArg::Reloc);
+                args.push(ObjInsArg::PlainText(")".to_string()));
+            }
+            elf::R_MIPS_GOT16 => {
+                args.push(ObjInsArg::PlainText("%got(".to_string()));
+                args.push(ObjInsArg::Reloc);
+                args.push(ObjInsArg::PlainText(")".to_string()));
+            }
+            elf::R_MIPS_CALL16 => {
+                args.push(ObjInsArg::PlainText("%call16(".to_string()));
+                args.push(ObjInsArg::Reloc);
+                args.push(ObjInsArg::PlainText(")".to_string()));
+            }
+            elf::R_MIPS_GPREL16 => {
+                args.push(ObjInsArg::PlainText("%gp_rel(".to_string()));
+                args.push(ObjInsArg::Reloc);
+                args.push(ObjInsArg::PlainText(")".to_string()));
+            }
+            elf::R_MIPS_32 | elf::R_MIPS_26 => {
+                args.push(ObjInsArg::Reloc);
+            }
+            _ => bail!("Unsupported ELF MIPS relocation type {r_type}"),
+        },
+        flags => panic!("Unsupported MIPS relocation flags {flags:?}"),
+    }
+    Ok(())
+}

objdiff-core/src/arch/mod.rs

@@ -0,0 +1,47 @@
+use std::borrow::Cow;
+use std::collections::BTreeMap;
+
+use anyhow::{bail, Result};
+use object::{Architecture, Object, Relocation, RelocationFlags};
+
+use crate::{
+    diff::{DiffObjConfig, ProcessCodeResult},
+    obj::{ObjReloc, ObjSection},
+};
+
+#[cfg(feature = "mips")]
+mod mips;
+#[cfg(feature = "ppc")]
+mod ppc;
+#[cfg(feature = "x86")]
+mod x86;
+
+pub trait ObjArch: Send + Sync {
+    fn process_code(
+        &self,
+        config: &DiffObjConfig,
+        data: &[u8],
+        address: u64,
+        relocs: &[ObjReloc],
+        line_info: &Option<BTreeMap<u64, u64>>,
+    ) -> Result<ProcessCodeResult>;
+
+    fn implcit_addend(&self, section: &ObjSection, address: u64, reloc: &Relocation)
+        -> Result<i64>;
+
+    fn demangle(&self, _name: &str) -> Option<String> { None }
+
+    fn display_reloc(&self, flags: RelocationFlags) -> Cow<'static, str>;
+}
+
+pub fn new_arch(object: &object::File) -> Result<Box<dyn ObjArch>> {
+    Ok(match object.architecture() {
+        #[cfg(feature = "ppc")]
+        Architecture::PowerPc => Box::new(ppc::ObjArchPpc::new(object)?),
+        #[cfg(feature = "mips")]
+        Architecture::Mips => Box::new(mips::ObjArchMips::new(object)?),
+        #[cfg(feature = "x86")]
+        Architecture::I386 | Architecture::X86_64 => Box::new(x86::ObjArchX86::new(object)?),
+        arch => bail!("Unsupported architecture: {arch:?}"),
+    })
+}

objdiff-core/src/arch/ppc.rs

@@ -0,0 +1,210 @@
+use std::borrow::Cow;
+use std::collections::BTreeMap;
+
+use anyhow::{bail, Result};
+use object::{elf, File, Relocation, RelocationFlags};
+use ppc750cl::{disasm_iter, Argument, SimplifiedIns, GPR};
+
+use crate::{
+    arch::ObjArch,
+    diff::{DiffObjConfig, ProcessCodeResult},
+    obj::{ObjIns, ObjInsArg, ObjInsArgValue, ObjReloc, ObjSection},
+};
+
+// Relative relocation, can be Simm, Offset or BranchDest
+fn is_relative_arg(arg: &Argument) -> bool {
+    matches!(arg, Argument::Simm(_) | Argument::Offset(_) | Argument::BranchDest(_))
+}
+
+// Relative or absolute relocation, can be Uimm, Simm or Offset
+fn is_rel_abs_arg(arg: &Argument) -> bool {
+    matches!(arg, Argument::Uimm(_) | Argument::Simm(_) | Argument::Offset(_))
+}
+
+fn is_offset_arg(arg: &Argument) -> bool { matches!(arg, Argument::Offset(_)) }
+
+pub struct ObjArchPpc {}
+
+impl ObjArchPpc {
+    pub fn new(_file: &File) -> Result<Self> { Ok(Self {}) }
+}
+
+impl ObjArch for ObjArchPpc {
+    fn process_code(
+        &self,
+        config: &DiffObjConfig,
+        data: &[u8],
+        address: u64,
+        relocs: &[ObjReloc],
+        line_info: &Option<BTreeMap<u64, u64>>,
+    ) -> Result<ProcessCodeResult> {
+        let ins_count = data.len() / 4;
+        let mut ops = Vec::<u16>::with_capacity(ins_count);
+        let mut insts = Vec::<ObjIns>::with_capacity(ins_count);
+        for mut ins in disasm_iter(data, address as u32) {
+            let reloc = relocs.iter().find(|r| (r.address as u32 & !3) == ins.addr);
+            if let Some(reloc) = reloc {
+                // Zero out relocations
+                ins.code = match reloc.flags {
+                    RelocationFlags::Elf { r_type: elf::R_PPC_EMB_SDA21 } => ins.code & !0x1FFFFF,
+                    RelocationFlags::Elf { r_type: elf::R_PPC_REL24 } => ins.code & !0x3FFFFFC,
+                    RelocationFlags::Elf { r_type: elf::R_PPC_REL14 } => ins.code & !0xFFFC,
+                    RelocationFlags::Elf {
+                        r_type: elf::R_PPC_ADDR16_HI | elf::R_PPC_ADDR16_HA | elf::R_PPC_ADDR16_LO,
+                    } => ins.code & !0xFFFF,
+                    _ => ins.code,
+                };
+            }
+            let simplified = ins.clone().simplified();
+
+            let mut reloc_arg = None;
+            if let Some(reloc) = reloc {
+                match reloc.flags {
+                    RelocationFlags::Elf { r_type: elf::R_PPC_EMB_SDA21 } => {
+                        reloc_arg = Some(1);
+                    }
+                    RelocationFlags::Elf { r_type: elf::R_PPC_REL24 | elf::R_PPC_REL14 } => {
+                        reloc_arg = simplified.args.iter().rposition(is_relative_arg);
+                    }
+                    RelocationFlags::Elf {
+                        r_type: elf::R_PPC_ADDR16_HI | elf::R_PPC_ADDR16_HA | elf::R_PPC_ADDR16_LO,
+                    } => {
+                        reloc_arg = simplified.args.iter().rposition(is_rel_abs_arg);
+                    }
+                    _ => {}
+                }
+            }
+
+            let mut args = vec![];
+            let mut branch_dest = None;
+            let mut writing_offset = false;
+            for (idx, arg) in simplified.args.iter().enumerate() {
+                if idx > 0 && !writing_offset {
+                    if config.space_between_args {
+                        args.push(ObjInsArg::PlainText(", ".to_string()));
+                    } else {
+                        args.push(ObjInsArg::PlainText(",".to_string()));
+                    }
+                }
+
+                if reloc_arg == Some(idx) {
+                    let reloc = reloc.unwrap();
+                    push_reloc(&mut args, reloc)?;
+                    // For @sda21, we can omit the register argument
+                    if matches!(reloc.flags, RelocationFlags::Elf { r_type: elf::R_PPC_EMB_SDA21 })
+                        // Sanity check: the next argument should be r0
+                        && matches!(simplified.args.get(idx + 1), Some(Argument::GPR(GPR(0))))
+                    {
+                        break;
+                    }
+                } else {
+                    match arg {
+                        Argument::Simm(simm) => {
+                            args.push(ObjInsArg::Arg(ObjInsArgValue::Signed(simm.0 as i64)));
+                        }
+                        Argument::Uimm(uimm) => {
+                            args.push(ObjInsArg::Arg(ObjInsArgValue::Unsigned(uimm.0 as u64)));
+                        }
+                        Argument::Offset(offset) => {
+                            args.push(ObjInsArg::Arg(ObjInsArgValue::Signed(offset.0 as i64)));
+                        }
+                        Argument::BranchDest(dest) => {
+                            let dest = ins.addr.wrapping_add_signed(dest.0) as u64;
+                            args.push(ObjInsArg::BranchDest(dest));
+                            branch_dest = Some(dest);
+                        }
+                        _ => {
+                            args.push(ObjInsArg::Arg(ObjInsArgValue::Opaque(arg.to_string())));
+                        }
+                    };
+                }
+
+                if writing_offset {
+                    args.push(ObjInsArg::PlainText(")".to_string()));
+                    writing_offset = false;
+                }
+                if is_offset_arg(arg) {
+                    args.push(ObjInsArg::PlainText("(".to_string()));
+                    writing_offset = true;
+                }
+            }
+
+            ops.push(simplified.ins.op as u16);
+            let line = line_info
+                .as_ref()
+                .and_then(|map| map.range(..=simplified.ins.addr as u64).last().map(|(_, &b)| b));
+            insts.push(ObjIns {
+                address: simplified.ins.addr as u64,
+                size: 4,
+                mnemonic: format!("{}{}", simplified.mnemonic, simplified.suffix),
+                args,
+                reloc: reloc.cloned(),
+                op: ins.op as u16,
+                branch_dest,
+                line,
+                orig: Some(format!("{}", SimplifiedIns::basic_form(ins))),
+            });
+        }
+        Ok(ProcessCodeResult { ops, insts })
+    }
+
+    fn implcit_addend(
+        &self,
+        _section: &ObjSection,
+        address: u64,
+        reloc: &Relocation,
+    ) -> Result<i64> {
+        bail!("Unsupported PPC implicit relocation {:#x}:{:?}", address, reloc.flags())
+    }
+
+    fn demangle(&self, name: &str) -> Option<String> {
+        cwdemangle::demangle(name, &Default::default())
+    }
+
+
+    fn display_reloc(&self, flags: RelocationFlags) -> Cow<'static, str> {
+        match flags {
+            RelocationFlags::Elf { r_type } => match r_type {
+                elf::R_PPC_ADDR16_LO => Cow::Borrowed("R_PPC_ADDR16_LO"),
+                elf::R_PPC_ADDR16_HI => Cow::Borrowed("R_PPC_ADDR16_HI"),
+                elf::R_PPC_ADDR16_HA => Cow::Borrowed("R_PPC_ADDR16_HA"),
+                elf::R_PPC_EMB_SDA21 => Cow::Borrowed("R_PPC_EMB_SDA21"),
+                elf::R_PPC_ADDR32 => Cow::Borrowed("R_PPC_ADDR32"),
+                elf::R_PPC_UADDR32 => Cow::Borrowed("R_PPC_UADDR32"),
+                elf::R_PPC_REL24 => Cow::Borrowed("R_PPC_REL24"),
+                elf::R_PPC_REL14 => Cow::Borrowed("R_PPC_REL14"),
+                _ => Cow::Owned(format!("<Elf {r_type:?}>")),
+            },
+            flags => Cow::Owned(format!("<{flags:?}>")),
+        }
+    }
+}
+
+fn push_reloc(args: &mut Vec<ObjInsArg>, reloc: &ObjReloc) -> Result<()> {
+    match reloc.flags {
+        RelocationFlags::Elf { r_type } => match r_type {
+            elf::R_PPC_ADDR16_LO => {
+                args.push(ObjInsArg::Reloc);
+                args.push(ObjInsArg::PlainText("@l".to_string()));
+            }
+            elf::R_PPC_ADDR16_HI => {
+                args.push(ObjInsArg::Reloc);
+                args.push(ObjInsArg::PlainText("@h".to_string()));
+            }
+            elf::R_PPC_ADDR16_HA => {
+                args.push(ObjInsArg::Reloc);
+                args.push(ObjInsArg::PlainText("@ha".to_string()));
+            }
+            elf::R_PPC_EMB_SDA21 => {
+                args.push(ObjInsArg::Reloc);
+                args.push(ObjInsArg::PlainText("@sda21".to_string()));
+            }
+            elf::R_PPC_ADDR32 | elf::R_PPC_UADDR32 | elf::R_PPC_REL24 | elf::R_PPC_REL14 => {
+                args.push(ObjInsArg::Reloc);
+            }
+            _ => bail!("Unsupported ELF PPC relocation type {r_type}"),
+        },
+        flags => bail!("Unsupported PPC relocation kind: {flags:?}"),
+    };
+    Ok(())
+}

objdiff-core/src/arch/x86.rs

@@ -1,4 +1,4 @@
-use std::collections::BTreeMap;
+use std::{borrow::Cow, collections::BTreeMap};
 
 use anyhow::{anyhow, bail, ensure, Result};
 use iced_x86::{
@@ -6,31 +6,36 @@ use iced_x86::{
     GasFormatter, Instruction, IntelFormatter, MasmFormatter, NasmFormatter, NumberKind, OpKind,
     PrefixKind, Register, SymbolResult,
 };
+use object::{pe, Endian, Endianness, File, Object, Relocation, RelocationFlags};
 
 use crate::{
-    diff::{DiffObjConfig, ProcessCodeResult},
-    obj::{ObjIns, ObjInsArg, ObjInsArgValue, ObjReloc, ObjRelocKind},
+    arch::ObjArch,
+    diff::{DiffObjConfig, ProcessCodeResult, X86Formatter},
+    obj::{ObjIns, ObjInsArg, ObjInsArgValue, ObjReloc, ObjSection},
 };
 
-#[derive(Debug, Copy, Clone, Default, Eq, PartialEq, serde::Deserialize, serde::Serialize)]
-pub enum X86Formatter {
-    #[default]
-    Intel,
-    Gas,
-    Nasm,
-    Masm,
+pub struct ObjArchX86 {
+    bits: u32,
+    endianness: Endianness,
 }
 
-pub fn process_code(
+impl ObjArchX86 {
+    pub fn new(object: &File) -> Result<Self> {
+        Ok(Self { bits: if object.is_64() { 64 } else { 32 }, endianness: object.endianness() })
+    }
+}
+
+impl ObjArch for ObjArchX86 {
+    fn process_code(
+        &self,
         config: &DiffObjConfig,
         data: &[u8],
-    bitness: u32,
         start_address: u64,
         relocs: &[ObjReloc],
         line_info: &Option<BTreeMap<u64, u64>>,
-) -> Result<ProcessCodeResult> {
+    ) -> Result<ProcessCodeResult> {
         let mut result = ProcessCodeResult { ops: Vec::new(), insts: Vec::new() };
-    let mut decoder = Decoder::with_ip(bitness, data, start_address, DecoderOptions::NONE);
+        let mut decoder = Decoder::with_ip(self.bits, data, start_address, DecoderOptions::NONE);
         let mut formatter: Box<dyn Formatter> = match config.x86_formatter {
             X86Formatter::Intel => Box::new(IntelFormatter::new()),
             X86Formatter::Gas => Box::new(GasFormatter::new()),
@@ -45,7 +50,7 @@ pub fn process_code(
                 address: 0,
                 size: 0,
                 op: 0,
-            mnemonic: "".to_string(),
+                mnemonic: String::new(),
                 args: vec![],
                 reloc: None,
                 branch_dest: None,
@@ -68,7 +73,7 @@ pub fn process_code(
                 address,
                 size: instruction.len() as u8,
                 op,
-            mnemonic: "".to_string(),
+                mnemonic: String::new(),
                 args: vec![],
                 reloc: reloc.cloned(),
                 branch_dest: None,
@@ -138,6 +143,41 @@ pub fn process_code(
             output.ins_operands.clear();
         }
         Ok(result)
+    }
+
+    fn implcit_addend(
+        &self,
+        section: &ObjSection,
+        address: u64,
+        reloc: &Relocation,
+    ) -> Result<i64> {
+        match reloc.flags() {
+            RelocationFlags::Coff { typ: pe::IMAGE_REL_I386_DIR32 | pe::IMAGE_REL_I386_REL32 } => {
+                let data = section.data[address as usize..address as usize + 4].try_into()?;
+                Ok(self.endianness.read_i32_bytes(data) as i64)
+            }
+            flags => bail!("Unsupported x86 implicit relocation {flags:?}"),
+        }
+    }
+
+    fn demangle(&self, name: &str) -> Option<String> {
+        if name.starts_with('?') {
+            msvc_demangler::demangle(name, msvc_demangler::DemangleFlags::llvm()).ok()
+        } else {
+            None
+        }
+    }
+
+    fn display_reloc(&self, flags: RelocationFlags) -> Cow<'static, str> {
+        match flags {
+            RelocationFlags::Coff { typ } => match typ {
+                pe::IMAGE_REL_I386_DIR32 => Cow::Borrowed("IMAGE_REL_I386_DIR32"),
+                pe::IMAGE_REL_I386_REL32 => Cow::Borrowed("IMAGE_REL_I386_REL32"),
+                _ => Cow::Owned(format!("<Coff {typ:?}>")),
+            },
+            flags => Cow::Owned(format!("<{flags:?}>")),
+        }
+    }
 }
 
 fn replace_arg(
@@ -242,13 +282,15 @@ impl FormatterOutput for InstructionFormatterOutput {
         match kind {
             FormatterTextKind::LabelAddress => {
                 if let Some(reloc) = self.ins.reloc.as_ref() {
-                    if reloc.kind == ObjRelocKind::Absolute {
+                    if matches!(reloc.flags, RelocationFlags::Coff {
+                        typ: pe::IMAGE_REL_I386_DIR32
+                    }) {
                         self.ins.args.push(ObjInsArg::Reloc);
                         return;
                     } else if self.error.is_none() {
                         self.error = Some(anyhow!(
-                            "x86: Unsupported LabelAddress relocation kind {:?}",
-                            reloc.kind
+                            "x86: Unsupported LabelAddress relocation flags {:?}",
+                            reloc.flags
                         ));
                     }
                 }
@@ -258,13 +300,15 @@ impl FormatterOutput for InstructionFormatterOutput {
             }
             FormatterTextKind::FunctionAddress => {
                 if let Some(reloc) = self.ins.reloc.as_ref() {
-                    if reloc.kind == ObjRelocKind::X86PcRel32 {
+                    if matches!(reloc.flags, RelocationFlags::Coff {
+                        typ: pe::IMAGE_REL_I386_REL32
+                    }) {
                         self.ins.args.push(ObjInsArg::Reloc);
                         return;
                     } else if self.error.is_none() {
                         self.error = Some(anyhow!(
-                            "x86: Unsupported FunctionAddress relocation kind {:?}",
-                            reloc.kind
+                            "x86: Unsupported FunctionAddress relocation flags {:?}",
+                            reloc.flags
                         ));
                     }
                 }

objdiff-core/src/diff/code.rs

@@ -8,17 +8,17 @@ use anyhow::Result;
 use similar::{capture_diff_slices_deadline, Algorithm};
 
 use crate::{
+    arch::ObjArch,
     diff::{DiffObjConfig, ProcessCodeResult},
-    obj,
     obj::{
-        ObjArchitecture, ObjInfo, ObjInsArg, ObjInsArgDiff, ObjInsBranchFrom, ObjInsBranchTo,
-        ObjInsDiff, ObjInsDiffKind, ObjReloc, ObjSymbol, ObjSymbolFlags,
+        ObjInfo, ObjInsArg, ObjInsArgDiff, ObjInsBranchFrom, ObjInsBranchTo, ObjInsDiff,
+        ObjInsDiffKind, ObjReloc, ObjSymbol, ObjSymbolFlags,
     },
 };
 
 pub fn no_diff_code(
+    arch: &dyn ObjArch,
     config: &DiffObjConfig,
-    arch: ObjArchitecture,
     data: &[u8],
     symbol: &mut ObjSymbol,
     relocs: &[ObjReloc],
@@ -26,29 +26,7 @@ pub fn no_diff_code(
 ) -> Result<()> {
     let code =
         &data[symbol.section_address as usize..(symbol.section_address + symbol.size) as usize];
-    let out: ProcessCodeResult = match arch {
-        #[cfg(feature = "ppc")]
-        ObjArchitecture::PowerPc => {
-            obj::ppc::process_code(config, code, symbol.address, relocs, line_info)?
-        }
-        #[cfg(feature = "mips")]
-        ObjArchitecture::Mips => obj::mips::process_code(
-            config,
-            code,
-            symbol.address,
-            symbol.address + symbol.size,
-            relocs,
-            line_info,
-        )?,
-        #[cfg(feature = "x86")]
-        ObjArchitecture::X86_32 => {
-            obj::x86::process_code(config, code, 32, symbol.address, relocs, line_info)?
-        }
-        #[cfg(feature = "x86")]
-        ObjArchitecture::X86_64 => {
-            obj::x86::process_code(config, code, 64, symbol.address, relocs, line_info)?
-        }
-    };
+    let out = arch.process_code(config, code, symbol.address, relocs, line_info)?;
 
     let mut diff = Vec::<ObjInsDiff>::new();
     for i in out.insts {
@@ -61,8 +39,8 @@ pub fn no_diff_code(
 
 #[allow(clippy::too_many_arguments)]
 pub fn diff_code(
+    arch: &dyn ObjArch,
     config: &DiffObjConfig,
-    arch: ObjArchitecture,
     left_data: &[u8],
     right_data: &[u8],
     left_symbol: &mut ObjSymbol,
@@ -76,82 +54,10 @@ pub fn diff_code(
         ..(left_symbol.section_address + left_symbol.size) as usize];
     let right_code = &right_data[right_symbol.section_address as usize
         ..(right_symbol.section_address + right_symbol.size) as usize];
-    let (left_out, right_out) = match arch {
-        #[cfg(feature = "ppc")]
-        ObjArchitecture::PowerPc => (
-            obj::ppc::process_code(
-                config,
-                left_code,
-                left_symbol.address,
-                left_relocs,
-                left_line_info,
-            )?,
-            obj::ppc::process_code(
-                config,
-                right_code,
-                right_symbol.address,
-                right_relocs,
-                right_line_info,
-            )?,
-        ),
-        #[cfg(feature = "mips")]
-        ObjArchitecture::Mips => (
-            obj::mips::process_code(
-                config,
-                left_code,
-                left_symbol.address,
-                left_symbol.address + left_symbol.size,
-                left_relocs,
-                left_line_info,
-            )?,
-            obj::mips::process_code(
-                config,
-                right_code,
-                right_symbol.address,
-                left_symbol.address + left_symbol.size,
-                right_relocs,
-                right_line_info,
-            )?,
-        ),
-        #[cfg(feature = "x86")]
-        ObjArchitecture::X86_32 => (
-            obj::x86::process_code(
-                config,
-                left_code,
-                32,
-                left_symbol.address,
-                left_relocs,
-                left_line_info,
-            )?,
-            obj::x86::process_code(
-                config,
-                right_code,
-                32,
-                right_symbol.address,
-                right_relocs,
-                right_line_info,
-            )?,
-        ),
-        #[cfg(feature = "x86")]
-        ObjArchitecture::X86_64 => (
-            obj::x86::process_code(
-                config,
-                left_code,
-                64,
-                left_symbol.address,
-                left_relocs,
-                left_line_info,
-            )?,
-            obj::x86::process_code(
-                config,
-                right_code,
-                64,
-                right_symbol.address,
-                right_relocs,
-                right_line_info,
-            )?,
-        ),
-    };
+    let left_out =
+        arch.process_code(config, left_code, left_symbol.address, left_relocs, left_line_info)?;
+    let right_out =
+        arch.process_code(config, right_code, right_symbol.address, right_relocs, right_line_info)?;
 
     let mut left_diff = Vec::<ObjInsDiff>::new();
     let mut right_diff = Vec::<ObjInsDiff>::new();
@@ -281,7 +187,7 @@ fn reloc_eq(
     let (Some(left), Some(right)) = (left_reloc, right_reloc) else {
         return false;
     };
-    if left.kind != right.kind {
+    if left.flags != right.flags {
         return false;
     }
     if config.relax_reloc_diffs {

objdiff-core/src/diff/mod.rs

@@ -9,9 +9,18 @@ use crate::{
         code::{diff_code, find_section_and_symbol, no_diff_code},
         data::{diff_bss_symbols, diff_data, no_diff_data},
     },
-    obj::{x86::X86Formatter, ObjInfo, ObjIns, ObjSectionKind},
+    obj::{ObjInfo, ObjIns, ObjSectionKind},
 };
 
+#[derive(Debug, Copy, Clone, Default, Eq, PartialEq, serde::Deserialize, serde::Serialize)]
+pub enum X86Formatter {
+    #[default]
+    Intel,
+    Gas,
+    Nasm,
+    Masm,
+}
+
 #[derive(Debug, Clone, Default, Eq, PartialEq, serde::Deserialize, serde::Serialize)]
 #[serde(default)]
 pub struct DiffObjConfig {
@@ -44,8 +53,8 @@ pub fn diff_objs(
                         left_symbol.diff_symbol = Some(right_symbol.name.clone());
                         right_symbol.diff_symbol = Some(left_symbol.name.clone());
                         diff_code(
+                            left.arch.as_ref(),
                             config,
-                            left.architecture,
                             &left_section.data,
                             &right_section.data,
                             left_symbol,
@@ -57,8 +66,8 @@ pub fn diff_objs(
                         )?;
                     } else {
                         no_diff_code(
+                            left.arch.as_ref(),
                             config,
-                            left.architecture,
                             &left_section.data,
                             left_symbol,
                             &left_section.relocations,
@@ -86,8 +95,8 @@ pub fn diff_objs(
                 for right_symbol in &mut right_section.symbols {
                     if right_symbol.instructions.is_empty() {
                         no_diff_code(
+                            right.arch.as_ref(),
                             config,
-                            right.architecture,
                             &right_section.data,
                             right_symbol,
                             &right_section.relocations,

objdiff-core/src/lib.rs

@@ -1,3 +1,4 @@
+pub mod arch;
 #[cfg(feature = "config")]
 pub mod config;
 pub mod diff;

objdiff-core/src/obj/mips.rs

@@ -1,155 +0,0 @@
-use std::collections::BTreeMap;
-
-use anyhow::Result;
-use rabbitizer::{config, Abi, InstrCategory, Instruction, OperandType};
-
-use crate::{
-    diff::{DiffObjConfig, ProcessCodeResult},
-    obj::{ObjIns, ObjInsArg, ObjInsArgValue, ObjReloc, ObjRelocKind},
-};
-
-fn configure_rabbitizer() {
-    unsafe {
-        config::RabbitizerConfig_Cfg.reg_names.fpr_abi_names = Abi::O32;
-    }
-}
-
-pub fn process_code(
-    config: &DiffObjConfig,
-    data: &[u8],
-    start_address: u64,
-    end_address: u64,
-    relocs: &[ObjReloc],
-    line_info: &Option<BTreeMap<u64, u64>>,
-) -> Result<ProcessCodeResult> {
-    configure_rabbitizer();
-
-    let ins_count = data.len() / 4;
-    let mut ops = Vec::<u16>::with_capacity(ins_count);
-    let mut insts = Vec::<ObjIns>::with_capacity(ins_count);
-    let mut cur_addr = start_address as u32;
-    for chunk in data.chunks_exact(4) {
-        let reloc = relocs.iter().find(|r| (r.address as u32 & !3) == cur_addr);
-        let code = u32::from_be_bytes(chunk.try_into()?);
-        let instruction = Instruction::new(code, cur_addr, InstrCategory::CPU);
-
-        let op = instruction.unique_id as u16;
-        ops.push(op);
-
-        let mnemonic = instruction.opcode_name().to_string();
-        let is_branch = instruction.is_branch();
-        let branch_offset = instruction.branch_offset();
-        let branch_dest = if is_branch {
-            cur_addr.checked_add_signed(branch_offset).map(|a| a as u64)
-        } else {
-            None
-        };
-
-        let operands = instruction.get_operands_slice();
-        let mut args = Vec::with_capacity(operands.len() + 1);
-        for (idx, op) in operands.iter().enumerate() {
-            if idx > 0 {
-                if config.space_between_args {
-                    args.push(ObjInsArg::PlainText(", ".to_string()));
-                } else {
-                    args.push(ObjInsArg::PlainText(",".to_string()));
-                }
-            }
-
-            match op {
-                OperandType::cpu_immediate
-                | OperandType::cpu_label
-                | OperandType::cpu_branch_target_label => {
-                    if let Some(branch_dest) = branch_dest {
-                        args.push(ObjInsArg::BranchDest(branch_dest));
-                    } else if let Some(reloc) = reloc {
-                        if matches!(&reloc.target_section, Some(s) if s == ".text")
-                            && reloc.target.address > start_address
-                            && reloc.target.address < end_address
-                        {
-                            args.push(ObjInsArg::BranchDest(reloc.target.address));
-                        } else {
-                            push_reloc(&mut args, reloc);
-                        }
-                    } else {
-                        args.push(ObjInsArg::Arg(ObjInsArgValue::Opaque(
-                            op.disassemble(&instruction, None),
-                        )));
-                    }
-                }
-                OperandType::cpu_immediate_base => {
-                    if let Some(reloc) = reloc {
-                        push_reloc(&mut args, reloc);
-                    } else {
-                        args.push(ObjInsArg::Arg(ObjInsArgValue::Opaque(
-                            OperandType::cpu_immediate.disassemble(&instruction, None),
-                        )));
-                    }
-                    args.push(ObjInsArg::PlainText("(".to_string()));
-                    args.push(ObjInsArg::Arg(ObjInsArgValue::Opaque(
-                        OperandType::cpu_rs.disassemble(&instruction, None),
-                    )));
-                    args.push(ObjInsArg::PlainText(")".to_string()));
-                }
-                _ => {
-                    args.push(ObjInsArg::Arg(ObjInsArgValue::Opaque(
-                        op.disassemble(&instruction, None),
-                    )));
-                }
-            }
-        }
-        let line = line_info
-            .as_ref()
-            .and_then(|map| map.range(..=cur_addr as u64).last().map(|(_, &b)| b));
-        insts.push(ObjIns {
-            address: cur_addr as u64,
-            size: 4,
-            op,
-            mnemonic,
-            args,
-            reloc: reloc.cloned(),
-            branch_dest,
-            line,
-            orig: None,
-        });
-        cur_addr += 4;
-    }
-    Ok(ProcessCodeResult { ops, insts })
-}
-
-fn push_reloc(args: &mut Vec<ObjInsArg>, reloc: &ObjReloc) {
-    match reloc.kind {
-        ObjRelocKind::MipsHi16 => {
-            args.push(ObjInsArg::PlainText("%hi(".to_string()));
-            args.push(ObjInsArg::Reloc);
-            args.push(ObjInsArg::PlainText(")".to_string()));
-        }
-        ObjRelocKind::MipsLo16 => {
-            args.push(ObjInsArg::PlainText("%lo(".to_string()));
-            args.push(ObjInsArg::Reloc);
-            args.push(ObjInsArg::PlainText(")".to_string()));
-        }
-        ObjRelocKind::MipsGot16 => {
-            args.push(ObjInsArg::PlainText("%got(".to_string()));
-            args.push(ObjInsArg::Reloc);
-            args.push(ObjInsArg::PlainText(")".to_string()));
-        }
-        ObjRelocKind::MipsCall16 => {
-            args.push(ObjInsArg::PlainText("%call16(".to_string()));
-            args.push(ObjInsArg::Reloc);
-            args.push(ObjInsArg::PlainText(")".to_string()));
-        }
-        ObjRelocKind::MipsGpRel16 => {
-            args.push(ObjInsArg::PlainText("%gp_rel(".to_string()));
-            args.push(ObjInsArg::Reloc);
-            args.push(ObjInsArg::PlainText(")".to_string()));
-        }
-        ObjRelocKind::Mips26 => {
-            args.push(ObjInsArg::Reloc);
-        }
-        ObjRelocKind::MipsGpRel32 => {
-            todo!("unimplemented: mips gp_rel32");
-        }
-        kind => panic!("Unsupported MIPS relocation kind: {:?}", kind),
-    }
-}

objdiff-core/src/obj/mod.rs

@@ -1,19 +1,14 @@
-#[cfg(feature = "mips")]
-pub mod mips;
-#[cfg(feature = "ppc")]
-pub mod ppc;
 pub mod read;
 pub mod split_meta;
-#[cfg(feature = "x86")]
-pub mod x86;
 
 use std::{collections::BTreeMap, fmt, path::PathBuf};
 
 use filetime::FileTime;
 use flagset::{flags, FlagSet};
+use object::RelocationFlags;
 use split_meta::SplitMeta;
 
-use crate::util::ReallySigned;
+use crate::{arch::ObjArch, util::ReallySigned};
 
 #[derive(Debug, Eq, PartialEq, Copy, Clone)]
 pub enum ObjSectionKind {
@@ -196,21 +191,8 @@ pub struct ObjSymbol {
     pub match_percent: Option<f32>,
 }
 
-#[derive(Debug, Copy, Clone)]
-pub enum ObjArchitecture {
-    #[cfg(feature = "ppc")]
-    PowerPc,
-    #[cfg(feature = "mips")]
-    Mips,
-    #[cfg(feature = "x86")]
-    X86_32,
-    #[cfg(feature = "x86")]
-    X86_64,
-}
-
-#[derive(Debug, Clone)]
 pub struct ObjInfo {
-    pub architecture: ObjArchitecture,
+    pub arch: Box<dyn ObjArch>,
     pub path: PathBuf,
     pub timestamp: FileTime,
     pub sections: Vec<ObjSection>,
@@ -222,50 +204,9 @@ pub struct ObjInfo {
     pub split_meta: Option<SplitMeta>,
 }
 
-#[derive(Debug, Eq, PartialEq, Copy, Clone)]
-pub enum ObjRelocKind {
-    Absolute,
-    #[cfg(feature = "ppc")]
-    PpcAddr16Hi,
-    #[cfg(feature = "ppc")]
-    PpcAddr16Ha,
-    #[cfg(feature = "ppc")]
-    PpcAddr16Lo,
-    // #[cfg(feature = "ppc")]
-    // PpcAddr32,
-    // #[cfg(feature = "ppc")]
-    // PpcRel32,
-    // #[cfg(feature = "ppc")]
-    // PpcAddr24,
-    #[cfg(feature = "ppc")]
-    PpcRel24,
-    // #[cfg(feature = "ppc")]
-    // PpcAddr14,
-    #[cfg(feature = "ppc")]
-    PpcRel14,
-    #[cfg(feature = "ppc")]
-    PpcEmbSda21,
-    #[cfg(feature = "mips")]
-    Mips26,
-    #[cfg(feature = "mips")]
-    MipsHi16,
-    #[cfg(feature = "mips")]
-    MipsLo16,
-    #[cfg(feature = "mips")]
-    MipsGot16,
-    #[cfg(feature = "mips")]
-    MipsCall16,
-    #[cfg(feature = "mips")]
-    MipsGpRel16,
-    #[cfg(feature = "mips")]
-    MipsGpRel32,
-    #[cfg(feature = "x86")]
-    X86PcRel32,
-}
-
 #[derive(Debug, Clone)]
 pub struct ObjReloc {
-    pub kind: ObjRelocKind,
+    pub flags: RelocationFlags,
     pub address: u64,
     pub target: ObjSymbol,
     pub target_section: Option<String>,

objdiff-core/src/obj/ppc.rs

@@ -1,164 +0,0 @@
-use std::collections::BTreeMap;
-
-use anyhow::{bail, Result};
-use ppc750cl::{disasm_iter, Argument, SimplifiedIns, GPR};
-
-use crate::{
-    diff::{DiffObjConfig, ProcessCodeResult},
-    obj::{ObjIns, ObjInsArg, ObjInsArgValue, ObjReloc, ObjRelocKind},
-};
-
-// Relative relocation, can be Simm, Offset or BranchDest
-fn is_relative_arg(arg: &Argument) -> bool {
-    matches!(arg, Argument::Simm(_) | Argument::Offset(_) | Argument::BranchDest(_))
-}
-
-// Relative or absolute relocation, can be Uimm, Simm or Offset
-fn is_rel_abs_arg(arg: &Argument) -> bool {
-    matches!(arg, Argument::Uimm(_) | Argument::Simm(_) | Argument::Offset(_))
-}
-
-fn is_offset_arg(arg: &Argument) -> bool { matches!(arg, Argument::Offset(_)) }
-
-pub fn process_code(
-    config: &DiffObjConfig,
-    data: &[u8],
-    address: u64,
-    relocs: &[ObjReloc],
-    line_info: &Option<BTreeMap<u64, u64>>,
-) -> Result<ProcessCodeResult> {
-    let ins_count = data.len() / 4;
-    let mut ops = Vec::<u16>::with_capacity(ins_count);
-    let mut insts = Vec::<ObjIns>::with_capacity(ins_count);
-    for mut ins in disasm_iter(data, address as u32) {
-        let reloc = relocs.iter().find(|r| (r.address as u32 & !3) == ins.addr);
-        if let Some(reloc) = reloc {
-            // Zero out relocations
-            ins.code = match reloc.kind {
-                ObjRelocKind::PpcEmbSda21 => ins.code & !0x1FFFFF,
-                ObjRelocKind::PpcRel24 => ins.code & !0x3FFFFFC,
-                ObjRelocKind::PpcRel14 => ins.code & !0xFFFC,
-                ObjRelocKind::PpcAddr16Hi
-                | ObjRelocKind::PpcAddr16Ha
-                | ObjRelocKind::PpcAddr16Lo => ins.code & !0xFFFF,
-                _ => ins.code,
-            };
-        }
-        let simplified = ins.clone().simplified();
-
-        let mut reloc_arg = None;
-        if let Some(reloc) = reloc {
-            match reloc.kind {
-                ObjRelocKind::PpcEmbSda21 => {
-                    reloc_arg = Some(1);
-                }
-                ObjRelocKind::PpcRel24 | ObjRelocKind::PpcRel14 => {
-                    reloc_arg = simplified.args.iter().rposition(is_relative_arg);
-                }
-                ObjRelocKind::PpcAddr16Hi
-                | ObjRelocKind::PpcAddr16Ha
-                | ObjRelocKind::PpcAddr16Lo => {
-                    reloc_arg = simplified.args.iter().rposition(is_rel_abs_arg);
-                }
-                _ => {}
-            }
-        }
-
-        let mut args = vec![];
-        let mut branch_dest = None;
-        let mut writing_offset = false;
-        for (idx, arg) in simplified.args.iter().enumerate() {
-            if idx > 0 && !writing_offset {
-                if config.space_between_args {
-                    args.push(ObjInsArg::PlainText(", ".to_string()));
-                } else {
-                    args.push(ObjInsArg::PlainText(",".to_string()));
-                }
-            }
-
-            if reloc_arg == Some(idx) {
-                let reloc = reloc.unwrap();
-                push_reloc(&mut args, reloc)?;
-                // For @sda21, we can omit the register argument
-                if reloc.kind == ObjRelocKind::PpcEmbSda21
-                    // Sanity check: the next argument should be r0
-                    && matches!(simplified.args.get(idx + 1), Some(Argument::GPR(GPR(0))))
-                {
-                    break;
-                }
-            } else {
-                match arg {
-                    Argument::Simm(simm) => {
-                        args.push(ObjInsArg::Arg(ObjInsArgValue::Signed(simm.0 as i64)));
-                    }
-                    Argument::Uimm(uimm) => {
-                        args.push(ObjInsArg::Arg(ObjInsArgValue::Unsigned(uimm.0 as u64)));
-                    }
-                    Argument::Offset(offset) => {
-                        args.push(ObjInsArg::Arg(ObjInsArgValue::Signed(offset.0 as i64)));
-                    }
-                    Argument::BranchDest(dest) => {
-                        let dest = ins.addr.wrapping_add_signed(dest.0) as u64;
-                        args.push(ObjInsArg::BranchDest(dest));
-                        branch_dest = Some(dest);
-                    }
-                    _ => {
-                        args.push(ObjInsArg::Arg(ObjInsArgValue::Opaque(arg.to_string())));
-                    }
-                };
-            }
-
-            if writing_offset {
-                args.push(ObjInsArg::PlainText(")".to_string()));
-                writing_offset = false;
-            }
-            if is_offset_arg(arg) {
-                args.push(ObjInsArg::PlainText("(".to_string()));
-                writing_offset = true;
-            }
-        }
-
-        ops.push(simplified.ins.op as u16);
-        let line = line_info
-            .as_ref()
-            .and_then(|map| map.range(..=simplified.ins.addr as u64).last().map(|(_, &b)| b));
-        insts.push(ObjIns {
-            address: simplified.ins.addr as u64,
-            size: 4,
-            mnemonic: format!("{}{}", simplified.mnemonic, simplified.suffix),
-            args,
-            reloc: reloc.cloned(),
-            op: ins.op as u16,
-            branch_dest,
-            line,
-            orig: Some(format!("{}", SimplifiedIns::basic_form(ins))),
-        });
-    }
-    Ok(ProcessCodeResult { ops, insts })
-}
-
-fn push_reloc(args: &mut Vec<ObjInsArg>, reloc: &ObjReloc) -> Result<()> {
-    match reloc.kind {
-        ObjRelocKind::PpcAddr16Lo => {
-            args.push(ObjInsArg::Reloc);
-            args.push(ObjInsArg::PlainText("@l".to_string()));
-        }
-        ObjRelocKind::PpcAddr16Hi => {
-            args.push(ObjInsArg::Reloc);
-            args.push(ObjInsArg::PlainText("@h".to_string()));
-        }
-        ObjRelocKind::PpcAddr16Ha => {
-            args.push(ObjInsArg::Reloc);
-            args.push(ObjInsArg::PlainText("@ha".to_string()));
-        }
-        ObjRelocKind::PpcEmbSda21 => {
-            args.push(ObjInsArg::Reloc);
-            args.push(ObjInsArg::PlainText("@sda21".to_string()));
-        }
-        ObjRelocKind::PpcRel24 | ObjRelocKind::PpcRel14 => {
-            args.push(ObjInsArg::Reloc);
-        }
-        kind => bail!("Unsupported PPC relocation kind: {:?}", kind),
-    };
-    Ok(())
-}

objdiff-core/src/obj/read.rs

@@ -5,15 +5,16 @@ use byteorder::{BigEndian, ReadBytesExt};
 use filetime::FileTime;
 use flagset::Flags;
 use object::{
-    elf, pe, Architecture, BinaryFormat, Endian, File, Object, ObjectSection, ObjectSymbol,
-    RelocationFlags, RelocationTarget, SectionIndex, SectionKind, Symbol, SymbolKind, SymbolScope,
-    SymbolSection,
+    BinaryFormat, File, Object, ObjectSection, ObjectSymbol, RelocationTarget, SectionIndex,
+    SectionKind, Symbol, SymbolKind, SymbolScope, SymbolSection,
 };
 
-use crate::obj::{
+use crate::{
+    arch::{new_arch, ObjArch},
+    obj::{
         split_meta::{SplitMeta, SPLITMETA_SECTION},
-    ObjArchitecture, ObjInfo, ObjReloc, ObjRelocKind, ObjSection, ObjSectionKind, ObjSymbol,
-    ObjSymbolFlagSet, ObjSymbolFlags,
+        ObjInfo, ObjReloc, ObjSection, ObjSectionKind, ObjSymbol, ObjSymbolFlagSet, ObjSymbolFlags,
+    },
 };
 
 fn to_obj_section_kind(kind: SectionKind) -> Option<ObjSectionKind> {
@@ -26,6 +27,7 @@ fn to_obj_section_kind(kind: SectionKind) -> Option<ObjSectionKind> {
 }
 
 fn to_obj_symbol(
+    arch: &dyn ObjArch,
     obj_file: &File<'_>,
     symbol: &Symbol<'_, '_>,
     addend: i64,
@@ -59,15 +61,7 @@ fn to_obj_symbol(
     } else {
         symbol.address()
     };
-    let mut demangled_name = None;
-    #[cfg(feature = "ppc")]
-    if obj_file.architecture() == Architecture::PowerPc {
-        demangled_name = cwdemangle::demangle(name, &Default::default());
-    }
-    #[cfg(feature = "x86")]
-    if matches!(obj_file.format(), BinaryFormat::Coff | BinaryFormat::Pe) && name.starts_with('?') {
-        demangled_name = msvc_demangler::demangle(name, msvc_demangler::DemangleFlags::llvm()).ok();
-    }
+    let demangled_name = arch.demangle(name);
     // Find the virtual address for the symbol if available
     let virtual_address = split_meta
         .and_then(|m| m.virtual_addresses.as_ref())
@@ -129,6 +123,7 @@ fn filter_sections(obj_file: &File<'_>, split_meta: Option<&SplitMeta>) -> Resul
 }
 
 fn symbols_by_section(
+    arch: &dyn ObjArch,
     obj_file: &File<'_>,
     section: &ObjSection,
     split_meta: Option<&SplitMeta>,
@@ -147,7 +142,7 @@ fn symbols_by_section(
                         continue;
                     }
                 }
-                result.push(to_obj_symbol(obj_file, &symbol, 0, split_meta)?);
+                result.push(to_obj_symbol(arch, obj_file, &symbol, 0, split_meta)?);
             }
         }
     }
@@ -165,15 +160,20 @@ fn symbols_by_section(
     Ok(result)
 }
 
-fn common_symbols(obj_file: &File<'_>, split_meta: Option<&SplitMeta>) -> Result<Vec<ObjSymbol>> {
+fn common_symbols(
+    arch: &dyn ObjArch,
+    obj_file: &File<'_>,
+    split_meta: Option<&SplitMeta>,
+) -> Result<Vec<ObjSymbol>> {
     obj_file
         .symbols()
         .filter(Symbol::is_common)
-        .map(|symbol| to_obj_symbol(obj_file, &symbol, 0, split_meta))
+        .map(|symbol| to_obj_symbol(arch, obj_file, &symbol, 0, split_meta))
         .collect::<Result<Vec<ObjSymbol>>>()
 }
 
 fn find_section_symbol(
+    arch: &dyn ObjArch,
     obj_file: &File<'_>,
     target: &Symbol<'_, '_>,
     address: u64,
@@ -197,7 +197,7 @@ fn find_section_symbol(
             }
             continue;
         }
-        return to_obj_symbol(obj_file, &symbol, 0, split_meta);
+        return to_obj_symbol(arch, obj_file, &symbol, 0, split_meta);
     }
     let (name, offset) = closest_symbol
         .and_then(|s| s.name().map(|n| (n, s.address())).ok())
@@ -221,7 +221,7 @@ fn find_section_symbol(
 }
 
 fn relocations_by_section(
-    arch: ObjArchitecture,
+    arch: &dyn ObjArch,
     obj_file: &File<'_>,
     section: &ObjSection,
     split_meta: Option<&SplitMeta>,
@@ -231,6 +231,10 @@ fn relocations_by_section(
     for (address, reloc) in obj_section.relocations() {
         let symbol = match reloc.target() {
             RelocationTarget::Symbol(idx) => {
+                if idx.0 == u32::MAX as usize {
+                    // ???
+                    continue;
+                }
                 let Ok(symbol) = obj_file.symbol_by_index(idx) else {
                     log::warn!(
                         "Failed to locate relocation {:#x} target symbol {}",
@@ -243,60 +247,7 @@ fn relocations_by_section(
             }
             _ => bail!("Unhandled relocation target: {:?}", reloc.target()),
         };
-        let kind = match reloc.flags() {
-            RelocationFlags::Elf { r_type } => match arch {
-                #[cfg(feature = "ppc")]
-                ObjArchitecture::PowerPc => match r_type {
-                    elf::R_PPC_ADDR32 | elf::R_PPC_UADDR32 => ObjRelocKind::Absolute,
-                    elf::R_PPC_ADDR16_LO => ObjRelocKind::PpcAddr16Lo,
-                    elf::R_PPC_ADDR16_HI => ObjRelocKind::PpcAddr16Hi,
-                    elf::R_PPC_ADDR16_HA => ObjRelocKind::PpcAddr16Ha,
-                    elf::R_PPC_REL24 => ObjRelocKind::PpcRel24,
-                    elf::R_PPC_REL14 => ObjRelocKind::PpcRel14,
-                    elf::R_PPC_EMB_SDA21 => ObjRelocKind::PpcEmbSda21,
-                    _ => bail!("Unhandled ELF PPC relocation type: {r_type}"),
-                },
-                #[cfg(feature = "mips")]
-                ObjArchitecture::Mips => match r_type {
-                    elf::R_MIPS_32 => ObjRelocKind::Absolute,
-                    elf::R_MIPS_26 => ObjRelocKind::Mips26,
-                    elf::R_MIPS_HI16 => ObjRelocKind::MipsHi16,
-                    elf::R_MIPS_LO16 => ObjRelocKind::MipsLo16,
-                    elf::R_MIPS_GOT16 => ObjRelocKind::MipsGot16,
-                    elf::R_MIPS_CALL16 => ObjRelocKind::MipsCall16,
-                    elf::R_MIPS_GPREL16 => ObjRelocKind::MipsGpRel16,
-                    elf::R_MIPS_GPREL32 => ObjRelocKind::MipsGpRel32,
-                    _ => bail!("Unhandled ELF MIPS relocation type: {r_type}"),
-                },
-                #[cfg(feature = "x86")]
-                ObjArchitecture::X86_32 => match r_type {
-                    elf::R_386_32 => ObjRelocKind::Absolute,
-                    elf::R_386_PC32 => ObjRelocKind::X86PcRel32,
-                    _ => bail!("Unhandled ELF x86_32 relocation type: {r_type}"),
-                },
-                #[cfg(feature = "x86")]
-                ObjArchitecture::X86_64 => match r_type {
-                    elf::R_X86_64_32 => ObjRelocKind::Absolute,
-                    elf::R_X86_64_PC32 => ObjRelocKind::X86PcRel32,
-                    _ => bail!("Unhandled ELF x86_64 relocation type: {r_type}"),
-                },
-            },
-            RelocationFlags::Coff { typ } => match arch {
-                #[cfg(feature = "ppc")]
-                ObjArchitecture::PowerPc => bail!("Unhandled PE/COFF PPC relocation type: {typ}"),
-                #[cfg(feature = "mips")]
-                ObjArchitecture::Mips => bail!("Unhandled PE/COFF MIPS relocation type: {typ}"),
-                #[cfg(feature = "x86")]
-                ObjArchitecture::X86_32 => match typ {
-                    pe::IMAGE_REL_I386_DIR32 => ObjRelocKind::Absolute,
-                    pe::IMAGE_REL_I386_REL32 => ObjRelocKind::X86PcRel32,
-                    _ => bail!("Unhandled PE/COFF x86 relocation type: {typ}"),
-                },
-                #[cfg(feature = "x86")]
-                ObjArchitecture::X86_64 => bail!("Unhandled PE/COFF x86_64 relocation type: {typ}"),
-            },
-            flags => bail!("Unhandled relocation flags: {:?}", flags),
-        };
+        let flags = reloc.flags(); // TODO validate reloc here?
         let target_section = match symbol.section() {
             SymbolSection::Common => Some(".comm".to_string()),
             SymbolSection::Section(idx) => {
@@ -305,40 +256,22 @@ fn relocations_by_section(
             _ => None,
         };
         let addend = if reloc.has_implicit_addend() {
-            let data = section.data[address as usize..address as usize + 4].try_into()?;
-            let addend = obj_file.endianness().read_u32_bytes(data);
-            match kind {
-                ObjRelocKind::Absolute => addend as i64,
-                #[cfg(feature = "mips")]
-                ObjRelocKind::MipsHi16 => ((addend & 0x0000FFFF) << 16) as i32 as i64,
-                #[cfg(feature = "mips")]
-                ObjRelocKind::MipsLo16
-                | ObjRelocKind::MipsGot16
-                | ObjRelocKind::MipsCall16
-                | ObjRelocKind::MipsGpRel16 => (addend & 0x0000FFFF) as i16 as i64,
-                #[cfg(feature = "mips")]
-                ObjRelocKind::MipsGpRel32 => addend as i32 as i64,
-                #[cfg(feature = "mips")]
-                ObjRelocKind::Mips26 => ((addend & 0x03FFFFFF) << 2) as i64,
-                #[cfg(feature = "x86")]
-                ObjRelocKind::X86PcRel32 => addend as i32 as i64,
-                _ => bail!("Unsupported implicit relocation {kind:?}"),
-            }
+            arch.implcit_addend(section, address, &reloc)?
         } else {
             reloc.addend()
         };
         // println!("Reloc: {reloc:?}, symbol: {symbol:?}, addend: {addend:#X}");
         let target = match symbol.kind() {
             SymbolKind::Text | SymbolKind::Data | SymbolKind::Label | SymbolKind::Unknown => {
-                to_obj_symbol(obj_file, &symbol, addend, split_meta)
+                to_obj_symbol(arch, obj_file, &symbol, addend, split_meta)
             }
             SymbolKind::Section => {
                 ensure!(addend >= 0, "Negative addend in reloc: {addend}");
-                find_section_symbol(obj_file, &symbol, addend as u64, split_meta)
+                find_section_symbol(arch, obj_file, &symbol, addend as u64, split_meta)
             }
             kind => Err(anyhow!("Unhandled relocation symbol type {kind:?}")),
         }?;
-        relocations.push(ObjReloc { kind, address, target, target_section });
+        relocations.push(ObjReloc { flags, address, target, target_section });
     }
     Ok(relocations)
 }
@@ -408,34 +341,25 @@ pub fn read(obj_path: &Path) -> Result<ObjInfo> {
         (unsafe { memmap2::Mmap::map(&file) }?, timestamp)
     };
     let obj_file = File::parse(&*data)?;
-    let architecture = match obj_file.architecture() {
-        #[cfg(feature = "ppc")]
-        Architecture::PowerPc => ObjArchitecture::PowerPc,
-        #[cfg(feature = "mips")]
-        Architecture::Mips => ObjArchitecture::Mips,
-        #[cfg(feature = "x86")]
-        Architecture::I386 => ObjArchitecture::X86_32,
-        #[cfg(feature = "x86")]
-        Architecture::X86_64 => ObjArchitecture::X86_64,
-        _ => bail!("Unsupported architecture: {:?}", obj_file.architecture()),
-    };
+    let arch = new_arch(&obj_file)?;
     let split_meta = split_meta(&obj_file)?;
-    let mut result = ObjInfo {
-        architecture,
+    let mut sections = filter_sections(&obj_file, split_meta.as_ref())?;
+    for section in &mut sections {
+        section.symbols =
+            symbols_by_section(arch.as_ref(), &obj_file, section, split_meta.as_ref())?;
+        section.relocations =
+            relocations_by_section(arch.as_ref(), &obj_file, section, split_meta.as_ref())?;
+    }
+    let common = common_symbols(arch.as_ref(), &obj_file, split_meta.as_ref())?;
+    Ok(ObjInfo {
+        arch,
         path: obj_path.to_owned(),
         timestamp,
-        sections: filter_sections(&obj_file, split_meta.as_ref())?,
-        common: common_symbols(&obj_file, split_meta.as_ref())?,
+        sections,
+        common,
         line_info: line_info(&obj_file)?,
-        split_meta: None,
-    };
-    for section in &mut result.sections {
-        section.symbols = symbols_by_section(&obj_file, section, split_meta.as_ref())?;
-        section.relocations =
-            relocations_by_section(architecture, &obj_file, section, split_meta.as_ref())?;
-    }
-    result.split_meta = split_meta;
-    Ok(result)
+        split_meta,
+    })
 }
 
 pub fn has_function(obj_path: &Path, symbol_name: &str) -> Result<bool> {

objdiff-gui/src/app.rs

@@ -290,7 +290,7 @@ impl App {
                             title: "Error".to_string(),
                             progress_percent: 0.0,
                             progress_items: None,
-                            status: "".to_string(),
+                            status: String::new(),
                             error: Some(err),
                         }));
                     }

objdiff-gui/src/views/config.rs

@@ -16,9 +16,9 @@ use egui::{
 use globset::Glob;
 use objdiff_core::{
     config::{ProjectObject, DEFAULT_WATCH_PATTERNS},
-    obj::x86::X86Formatter,
 };
 use self_update::cargo_crate_version;
+use objdiff_core::diff::X86Formatter;
 
 use crate::{
     app::{AppConfig, AppConfigRef, ObjectConfig},

objdiff-gui/src/views/function_diff.rs

@@ -3,6 +3,7 @@ use std::default::Default;
 use egui::{text::LayoutJob, Align, Label, Layout, Sense, Vec2, Widget};
 use egui_extras::{Column, TableBuilder, TableRow};
 use objdiff_core::{
+    arch::ObjArch,
     diff::display::{display_diff, DiffText, HighlightKind},
     obj::{
         ObjInfo, ObjIns, ObjInsArg, ObjInsArgValue, ObjInsDiff, ObjInsDiffKind, ObjSection,
@@ -21,7 +22,13 @@ pub struct FunctionViewState {
     pub highlight: HighlightKind,
 }
 
-fn ins_hover_ui(ui: &mut egui::Ui, section: &ObjSection, ins: &ObjIns, appearance: &Appearance) {
+fn ins_hover_ui(
+    ui: &mut egui::Ui,
+    arch: &dyn ObjArch,
+    section: &ObjSection,
+    ins: &ObjIns,
+    appearance: &Appearance,
+) {
     ui.scope(|ui| {
         ui.style_mut().override_text_style = Some(egui::TextStyle::Monospace);
         ui.style_mut().wrap = Some(false);
@@ -51,7 +58,7 @@ fn ins_hover_ui(ui: &mut egui::Ui, section: &ObjSection, ins: &ObjIns, appearanc
         }
 
         if let Some(reloc) = &ins.reloc {
-            ui.label(format!("Relocation type: {:?}", reloc.kind));
+            ui.label(format!("Relocation type: {}", arch.display_reloc(reloc.flags)));
             ui.colored_label(appearance.highlight_color, format!("Name: {}", reloc.target.name));
             if let Some(section) = &reloc.target_section {
                 ui.colored_label(appearance.highlight_color, format!("Section: {section}"));
@@ -122,10 +129,14 @@ fn ins_context_menu(ui: &mut egui::Ui, ins: &ObjIns) {
 fn find_symbol<'a>(
     obj: &'a ObjInfo,
     selected_symbol: &SymbolReference,
-) -> Option<(&'a ObjSection, &'a ObjSymbol)> {
+) -> Option<(&'a dyn ObjArch, &'a ObjSection, &'a ObjSymbol)> {
     obj.sections.iter().find_map(|section| {
         section.symbols.iter().find_map(|symbol| {
-            (symbol.name == selected_symbol.symbol_name).then_some((section, symbol))
+            (symbol.name == selected_symbol.symbol_name).then_some((
+                obj.arch.as_ref(),
+                section,
+                symbol,
+            ))
         })
     })
 }
@@ -238,6 +249,7 @@ fn asm_row_ui(
 fn asm_col_ui(
     row: &mut TableRow<'_, '_>,
     ins_diff: &ObjInsDiff,
+    arch: &dyn ObjArch,
     section: &ObjSection,
     symbol: &ObjSymbol,
     appearance: &Appearance,
@@ -247,7 +259,7 @@ fn asm_col_ui(
         asm_row_ui(ui, ins_diff, symbol, appearance, ins_view_state);
     });
     if let Some(ins) = &ins_diff.ins {
-        response.on_hover_ui_at_pointer(|ui| ins_hover_ui(ui, section, ins, appearance));
+        response.on_hover_ui_at_pointer(|ui| ins_hover_ui(ui, arch, section, ins, appearance));
     }
 }
 
@@ -267,14 +279,15 @@ fn asm_table_ui(
 ) -> Option<()> {
     let left_symbol = left_obj.and_then(|obj| find_symbol(obj, selected_symbol));
     let right_symbol = right_obj.and_then(|obj| find_symbol(obj, selected_symbol));
-    let instructions_len = left_symbol.or(right_symbol).map(|(_, s)| s.instructions.len())?;
+    let instructions_len = left_symbol.or(right_symbol).map(|(_, _, s)| s.instructions.len())?;
     table.body(|body| {
         body.rows(appearance.code_font.size, instructions_len, |mut row| {
             let row_index = row.index();
-            if let Some((section, symbol)) = left_symbol {
+            if let Some((arch, section, symbol)) = left_symbol {
                 asm_col_ui(
                     &mut row,
                     &symbol.instructions[row_index],
+                    arch,
                     section,
                     symbol,
                     appearance,
@@ -283,10 +296,11 @@ fn asm_table_ui(
             } else {
                 empty_col_ui(&mut row);
             }
-            if let Some((section, symbol)) = right_symbol {
+            if let Some((arch, section, symbol)) = right_symbol {
                 asm_col_ui(
                     &mut row,
                     &symbol.instructions[row_index],
+                    arch,
                     section,
                     symbol,
                     appearance,
@@ -399,7 +413,7 @@ pub fn function_diff_ui(ui: &mut egui::Ui, state: &mut DiffViewState, appearance
                             .second_obj
                             .as_ref()
                             .and_then(|obj| find_symbol(obj, selected_symbol))
-                            .and_then(|(_, symbol)| symbol.match_percent)
+                            .and_then(|(_, _, symbol)| symbol.match_percent)
                         {
                             ui.colored_label(
                                 match_color_for_symbol(match_percent, appearance),