Support `block_relocations` and `add_relocations` in `config.yml`

This allows more granular control over generated relocations.

Also optimizes relocation address validity checks,
leading to ~20% faster relocation analysis.

Config example:
```
block_relocations:
# Block any relocation pointing to this address.
- target: .data:0x80130140
# Block any relocation originating from this address.
- source: .text:0x80047160
  # (optional) End address to make it a range.
  end: .text:0x800471A8

add_relocations:
# Inserts or overwrites a relocation.
# From: `subi r3, r3, 0x7657`
# To: `li r3, mesWInsert-0x1@sda21`
- source: .text:0x800473F4
  type: sda21
  target: mesWInsert
  addend: -1
```

Resolves #33
Resolves #52

src/analysis/tracker.rs

@@ -283,7 +283,7 @@ impl Tracker {
                 Ok(ExecCbResult::Continue)
             }
             StepResult::LoadStore { address, source, source_reg } => {
-                if self.is_valid_section_address(obj, ins_addr) {
+                if !obj.blocked_relocation_sources.contains(ins_addr) {
                     if (source_reg == 2
                         && matches!(self.sda2_base, Some(v) if source.value == GprValue::Constant(v)))
                         || (source_reg == 13
@@ -503,28 +503,12 @@ impl Tracker {
         Ok(())
     }
 
-    fn is_valid_section_address(&self, obj: &ObjInfo, from: SectionAddress) -> bool {
-        if let Some((&start, &end)) = obj.blocked_ranges.range(..=from).next_back() {
-            if from.section == start.section && from.address >= start.address && from.address < end
-            {
-                return false;
-            }
-        }
-        true
-    }
-
     fn is_valid_address(
         &self,
         obj: &ObjInfo,
         from: SectionAddress,
         addr: u32,
     ) -> Option<SectionAddress> {
-        if let Some((&start, &end)) = obj.blocked_ranges.range(..=from).next_back() {
-            if from.section == start.section && from.address >= start.address && from.address < end
-            {
-                return None;
-            }
-        }
         // Check for an existing relocation
         if cfg!(debug_assertions) {
             let relocation_target = relocation_target_for(obj, from, None).ok().flatten();
@@ -537,11 +521,29 @@ impl Tracker {
         if obj.kind == ObjKind::Relocatable {
             return None;
         }
-        if self.known_relocations.contains(&from) {
+        // Check blocked relocation sources
-            let section_index =
+        if obj.blocked_relocation_sources.contains(from) {
-                obj.sections.at_address(addr).ok().map(|(idx, _)| idx).unwrap_or(usize::MAX);
+            return None;
-            return Some(SectionAddress::new(section_index, addr));
         }
+        // Find the section containing the address
+        if let Ok((section_index, section)) = obj.sections.at_address(addr) {
+            // References to code sections will never be unaligned
+            if section.kind == ObjSectionKind::Code && addr & 3 != 0 {
+                return None;
+            }
+            let section_address = SectionAddress::new(section_index, addr);
+            // Check blocked relocation targets
+            if obj.blocked_relocation_targets.contains(section_address) {
+                return None;
+            }
+            // It's valid
+            Some(section_address)
+        } else {
+            // Check known relocations (function signature matching)
+            if self.known_relocations.contains(&from) {
+                return Some(SectionAddress::new(usize::MAX, addr));
+            }
+            // Check special symbols
             if self.stack_address == Some(addr)
                 || self.stack_end == Some(addr)
                 || self.db_stack_addr == Some(addr)
@@ -550,21 +552,12 @@ impl Tracker {
                 || self.sda2_base == Some(addr)
                 || self.sda_base == Some(addr)
             {
-            let section_index =
+                return Some(SectionAddress::new(usize::MAX, addr));
-                obj.sections.at_address(addr).ok().map(|(idx, _)| idx).unwrap_or(usize::MAX);
-            return Some(SectionAddress::new(section_index, addr));
-        }
-        // if addr > 0x80000000 && addr < 0x80003100 {
-        //     return true;
-        // }
-        if let Ok((section_index, section)) = obj.sections.at_address(addr) {
-            // References to code sections will never be unaligned
-            if section.kind != ObjSectionKind::Code || addr & 3 == 0 {
-                return Some(SectionAddress::new(section_index, addr));
-            }
             }
+            // Not valid
             None
         }
+    }
 
     fn special_symbol(
         &self,

src/cmd/dol.rs

@@ -13,6 +13,7 @@ use std::{
 
 use anyhow::{anyhow, bail, Context, Result};
 use argp::FromArgs;
+use cwdemangle::demangle;
 use itertools::Itertools;
 use rayon::prelude::*;
 use serde::{Deserialize, Serialize};
@@ -40,8 +41,8 @@ use crate::{
         bin2c::bin2c,
         comment::MWComment,
         config::{
-            apply_splits_file, apply_symbols_file, is_auto_symbol, write_splits_file,
+            apply_splits_file, apply_symbols_file, is_auto_symbol, signed_hex_serde,
-            write_symbols_file,
+            write_splits_file, write_symbols_file, SectionAddressRef,
         },
         dep::DepFile,
         dol::process_dol,
@@ -236,7 +237,27 @@ pub struct ProjectConfig {
     pub export_all: bool,
 }
 
-#[derive(Serialize, Deserialize, Debug, Clone, PartialEq)]
+impl Default for ProjectConfig {
+    fn default() -> Self {
+        Self {
+            base: Default::default(),
+            selfile: None,
+            selfile_hash: None,
+            mw_comment_version: None,
+            quick_analysis: false,
+            modules: vec![],
+            detect_objects: true,
+            detect_strings: true,
+            write_asm: true,
+            common_start: None,
+            symbols_known: false,
+            fill_gaps: true,
+            export_all: true,
+        }
+    }
+}
+
+#[derive(Serialize, Deserialize, Debug, Clone, PartialEq, Default)]
 pub struct ModuleConfig {
     /// Object name. If not specified, the file name without extension will be used.
     #[serde(skip_serializing_if = "is_default")]
@@ -261,6 +282,10 @@ pub struct ModuleConfig {
     pub links: Option<Vec<String>>,
     #[serde(default, skip_serializing_if = "Vec::is_empty")]
     pub extract: Vec<ExtractConfig>,
+    #[serde(default, skip_serializing_if = "Vec::is_empty")]
+    pub block_relocations: Vec<BlockRelocationConfig>,
+    #[serde(default, skip_serializing_if = "Vec::is_empty")]
+    pub add_relocations: Vec<AddRelocationConfig>,
 }
 
 #[derive(Serialize, Deserialize, Debug, Clone, PartialEq)]
@@ -277,6 +302,36 @@ pub struct ExtractConfig {
     pub header: Option<PathBuf>,
 }
 
+/// A relocation that should be blocked.
+/// Only one of `source` or `target` should be specified.
+#[derive(Serialize, Deserialize, Debug, Clone, PartialEq)]
+pub struct BlockRelocationConfig {
+    /// Match by the address of the relocation.
+    /// Format: `section:address`, e.g. `.text:0x80001234`.
+    pub source: Option<SectionAddressRef>,
+    /// Match by the address of the relocation target.
+    /// Format: `section:address`, e.g. `.text:0x80001234`.
+    pub target: Option<SectionAddressRef>,
+    /// An optional end address for the (exclusive) range.
+    /// Format: `section:address`, e.g. `.text:0x80001234`.
+    pub end: Option<SectionAddressRef>,
+}
+
+#[derive(Serialize, Deserialize, Debug, Clone, PartialEq)]
+pub struct AddRelocationConfig {
+    /// The address of the relocation to add.
+    /// Format: `section:address`, e.g. `.text:0x80001234`.
+    pub source: SectionAddressRef,
+    /// The relocation type to add.
+    #[serde(rename = "type")]
+    pub kind: ObjRelocKind,
+    /// The target symbol name.
+    pub target: String,
+    /// The addend for the relocation. (optional)
+    #[serde(with = "signed_hex_serde", default, skip_serializing_if = "is_default")]
+    pub addend: i64,
+}
+
 impl ModuleConfig {
     pub fn file_name(&self) -> Cow<'_, str> {
         self.object.file_name().unwrap_or(self.object.as_os_str()).to_string_lossy()
@@ -763,6 +818,9 @@ fn load_analyze_dol(config: &ProjectConfig) -> Result<AnalyzeResult> {
         None
     };
 
+    // Apply block relocations from config
+    apply_block_relocations(&mut obj, &config.base.block_relocations)?;
+
     if !config.symbols_known {
         // TODO move before symbols?
         debug!("Performing signature analysis");
@@ -793,6 +851,9 @@ fn load_analyze_dol(config: &ProjectConfig) -> Result<AnalyzeResult> {
     // Create _ctors and _dtors symbols if missing
     update_ctors_dtors(&mut obj)?;
 
+    // Apply additional relocations from config
+    apply_add_relocations(&mut obj, &config.base.add_relocations)?;
+
     Ok(AnalyzeResult { obj, dep, symbols_cache, splits_cache })
 }
 
@@ -988,6 +1049,9 @@ fn load_analyze_rel(config: &ProjectConfig, module_config: &ModuleConfig) -> Res
         None
     };
 
+    // Apply block relocations from config
+    apply_block_relocations(&mut module_obj, &module_config.block_relocations)?;
+
     if !config.symbols_known {
         debug!("Analyzing module {}", module_obj.module_id);
         if !config.quick_analysis {
@@ -1007,6 +1071,9 @@ fn load_analyze_rel(config: &ProjectConfig, module_config: &ModuleConfig) -> Res
     // Determine REL section alignment
     update_rel_section_alignment(&mut module_obj, &header)?;
 
+    // Apply additional relocations from config
+    apply_add_relocations(&mut module_obj, &module_config.add_relocations)?;
+
     Ok(AnalyzeResult { obj: module_obj, dep, symbols_cache, splits_cache })
 }
 
@@ -1750,33 +1817,7 @@ fn apply(args: ApplyArgs) -> Result<()> {
 }
 
 fn config(args: ConfigArgs) -> Result<()> {
-    let mut config = ProjectConfig {
+    let mut config = ProjectConfig::default();
-        base: ModuleConfig {
-            name: None,
-            object: Default::default(),
-            hash: None,
-            splits: None,
-            symbols: None,
-            map: None,
-            force_active: vec![],
-            ldscript_template: None,
-            links: None,
-            extract: vec![],
-        },
-        selfile: None,
-        selfile_hash: None,
-        mw_comment_version: None,
-        quick_analysis: false,
-        modules: vec![],
-        detect_objects: true,
-        detect_strings: true,
-        write_asm: true,
-        common_start: None,
-        symbols_known: false,
-        fill_gaps: true,
-        export_all: true,
-    };
-
     let mut modules = Vec::<(u32, ModuleConfig)>::new();
     for result in FileIterator::new(&args.objects)? {
         let (path, entry) = result?;
@@ -1790,16 +1831,9 @@ fn config(args: ConfigArgs) -> Result<()> {
             Some(ext) if ext.eq_ignore_ascii_case(OsStr::new("rel")) => {
                 let header = process_rel_header(&mut entry.as_reader())?;
                 modules.push((header.module_id, ModuleConfig {
-                    name: None,
                     object: path,
                     hash: Some(file_sha1_string(&mut entry.as_reader())?),
-                    splits: None,
+                    ..Default::default()
-                    symbols: None,
-                    map: None,
-                    force_active: vec![],
-                    ldscript_template: None,
-                    links: None,
-                    extract: vec![],
                 }));
             }
             Some(ext) if ext.eq_ignore_ascii_case(OsStr::new("sel")) => {
@@ -1808,16 +1842,9 @@ fn config(args: ConfigArgs) -> Result<()> {
             }
             Some(ext) if ext.eq_ignore_ascii_case(OsStr::new("rso")) => {
                 config.modules.push(ModuleConfig {
-                    name: None,
                     object: path,
                     hash: Some(file_sha1_string(&mut entry.as_reader())?),
-                    splits: None,
+                    ..Default::default()
-                    symbols: None,
-                    map: None,
-                    force_active: vec![],
-                    ldscript_template: None,
-                    links: None,
-                    extract: vec![],
                 });
             }
             _ => bail!("Unknown file extension: '{}'", path.display()),
@@ -1834,3 +1861,56 @@ fn config(args: ConfigArgs) -> Result<()> {
     out.flush()?;
     Ok(())
 }
+
+/// Applies the blocked relocation ranges from module config `blocked_relocations`
+fn apply_block_relocations(
+    obj: &mut ObjInfo,
+    block_relocations: &[BlockRelocationConfig],
+) -> Result<()> {
+    for reloc in block_relocations {
+        let end = reloc.end.as_ref().map(|end| end.resolve(obj)).transpose()?;
+        match (&reloc.source, &reloc.target) {
+            (Some(_), Some(_)) => {
+                bail!("Cannot specify both source and target for blocked relocation");
+            }
+            (Some(source), None) => {
+                let start = source.resolve(obj)?;
+                obj.blocked_relocation_sources.insert(start, end.unwrap_or(start + 1));
+            }
+            (None, Some(target)) => {
+                let start = target.resolve(obj)?;
+                obj.blocked_relocation_targets.insert(start, end.unwrap_or(start + 1));
+            }
+            (None, None) => {
+                bail!("Blocked relocation must specify either source or target");
+            }
+        }
+    }
+    Ok(())
+}
+
+/// Applies the relocations from module config `add_relocations`.
+fn apply_add_relocations(obj: &mut ObjInfo, relocations: &[AddRelocationConfig]) -> Result<()> {
+    for reloc in relocations {
+        let SectionAddress { section, address } = reloc.source.resolve(obj)?;
+        let (target_symbol, _) = match obj.symbols.by_name(&reloc.target)? {
+            Some(v) => v,
+            None => {
+                // Assume external symbol
+                let symbol_index = obj.symbols.add_direct(ObjSymbol {
+                    name: reloc.target.clone(),
+                    demangled_name: demangle(&reloc.target, &Default::default()),
+                    ..Default::default()
+                })?;
+                (symbol_index, &obj.symbols[symbol_index])
+            }
+        };
+        obj.sections[section].relocations.replace(address, ObjReloc {
+            kind: reloc.kind,
+            target_symbol,
+            addend: reloc.addend,
+            module: None,
+        });
+    }
+    Ok(())
+}

src/obj/addresses.rs

@@ -0,0 +1,100 @@
+use crate::analysis::cfa::SectionAddress;
+
+/// A collection of address ranges.
+/// Slow to insert, but fast to check if an address is contained in any of the ranges.
+#[derive(Debug, Clone)]
+pub struct AddressRanges {
+    /// (start, end) pairs of addresses.
+    inner: Vec<(SectionAddress, u32)>,
+}
+
+impl Default for AddressRanges {
+    fn default() -> Self { Self::new() }
+}
+
+impl AddressRanges {
+    #[inline]
+    pub fn new() -> Self { Self { inner: vec![] } }
+
+    pub fn insert(&mut self, start: SectionAddress, end: SectionAddress) {
+        debug_assert_eq!(
+            start.section, end.section,
+            "AddressIntervals::insert: start and end must be in the same section"
+        );
+        // TODO: Handle overlapping ranges?
+        match self.inner.binary_search_by_key(&start, |&(start, _)| start) {
+            Ok(pos) => {
+                let (_, end_ref) = &mut self.inner[pos];
+                *end_ref = end.address.max(*end_ref);
+            }
+            Err(pos) => self.inner.insert(pos, (start, end.address)),
+        }
+    }
+
+    pub fn contains(&self, address: SectionAddress) -> bool {
+        let pos = match self.inner.binary_search_by_key(&address, |&(start, _)| start) {
+            Ok(_) => return true,
+            Err(pos) => pos,
+        };
+        if pos == 0 {
+            return false;
+        }
+        let (start, end) = &self.inner[pos - 1];
+        start.section == address.section
+            && address.address >= start.address
+            && address.address < *end
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_contains() {
+        let mut intervals = AddressRanges::new();
+        intervals.insert(SectionAddress { section: 0, address: 0x80000000 }, SectionAddress {
+            section: 0,
+            address: 0x80000004,
+        });
+        intervals.insert(SectionAddress { section: 0, address: 0x80000008 }, SectionAddress {
+            section: 0,
+            address: 0x8000000C,
+        });
+        intervals.insert(SectionAddress { section: 12, address: 0x80004000 }, SectionAddress {
+            section: 12,
+            address: 0x80004004,
+        });
+        intervals.insert(SectionAddress { section: 12, address: 0x80004008 }, SectionAddress {
+            section: 12,
+            address: 0x8000400C,
+        });
+
+        assert!(intervals.contains(SectionAddress { section: 0, address: 0x80000000 }));
+        assert!(intervals.contains(SectionAddress { section: 0, address: 0x80000001 }));
+        assert!(intervals.contains(SectionAddress { section: 0, address: 0x80000002 }));
+        assert!(intervals.contains(SectionAddress { section: 0, address: 0x80000003 }));
+        assert!(!intervals.contains(SectionAddress { section: 0, address: 0x80000004 }));
+        assert!(!intervals.contains(SectionAddress { section: 0, address: 0x80000005 }));
+        assert!(!intervals.contains(SectionAddress { section: 0, address: 0x80000006 }));
+        assert!(!intervals.contains(SectionAddress { section: 0, address: 0x80000007 }));
+        assert!(intervals.contains(SectionAddress { section: 0, address: 0x80000008 }));
+        assert!(intervals.contains(SectionAddress { section: 0, address: 0x80000009 }));
+        assert!(intervals.contains(SectionAddress { section: 0, address: 0x8000000A }));
+        assert!(intervals.contains(SectionAddress { section: 0, address: 0x8000000B }));
+
+        assert!(intervals.contains(SectionAddress { section: 12, address: 0x80004000 }));
+        assert!(intervals.contains(SectionAddress { section: 12, address: 0x80004001 }));
+        assert!(intervals.contains(SectionAddress { section: 12, address: 0x80004002 }));
+        assert!(intervals.contains(SectionAddress { section: 12, address: 0x80004003 }));
+        assert!(!intervals.contains(SectionAddress { section: 12, address: 0x80004004 }));
+        assert!(!intervals.contains(SectionAddress { section: 12, address: 0x80004005 }));
+        assert!(!intervals.contains(SectionAddress { section: 12, address: 0x80004006 }));
+        assert!(!intervals.contains(SectionAddress { section: 12, address: 0x80004007 }));
+        assert!(intervals.contains(SectionAddress { section: 12, address: 0x80004008 }));
+        assert!(intervals.contains(SectionAddress { section: 12, address: 0x80004009 }));
+        assert!(intervals.contains(SectionAddress { section: 12, address: 0x8000400A }));
+        assert!(intervals.contains(SectionAddress { section: 12, address: 0x8000400B }));
+        assert!(!intervals.contains(SectionAddress { section: 12, address: 0x8000400C }));
+    }
+}

src/obj/mod.rs

@@ -1,3 +1,4 @@
+mod addresses;
 mod relocations;
 mod sections;
 mod splits;
@@ -21,6 +22,7 @@ pub use symbols::{
 
 use crate::{
     analysis::cfa::SectionAddress,
+    obj::addresses::AddressRanges,
     util::{comment::MWComment, rel::RelReloc},
 };
 
@@ -69,7 +71,8 @@ pub struct ObjInfo {
 
     // Extracted
     pub link_order: Vec<ObjUnit>,
-    pub blocked_ranges: BTreeMap<SectionAddress, u32>, // start -> end
+    pub blocked_relocation_sources: AddressRanges,
+    pub blocked_relocation_targets: AddressRanges,
 
     // From .ctors, .dtors and extab
     pub known_functions: BTreeMap<SectionAddress, Option<u32>>,
@@ -105,7 +108,8 @@ impl ObjInfo {
             arena_lo: None,
             arena_hi: None,
             link_order: vec![],
-            blocked_ranges: Default::default(),
+            blocked_relocation_sources: Default::default(),
+            blocked_relocation_targets: Default::default(),
             known_functions: Default::default(),
             module_id: 0,
             unresolved_relocations: vec![],

src/obj/relocations.rs

@@ -10,7 +10,7 @@ use serde::{Deserialize, Serialize};
 
 use crate::obj::SymbolIndex;
 
-#[derive(Debug, Copy, Clone, Eq, PartialEq, Hash, Serialize, Deserialize)]
+#[derive(Debug, Copy, Clone, Eq, PartialEq, Hash)]
 pub enum ObjRelocKind {
     Absolute,
     PpcAddr16Hi,
@@ -21,6 +21,39 @@ pub enum ObjRelocKind {
     PpcEmbSda21,
 }
 
+impl Serialize for ObjRelocKind {
+    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
+    where S: serde::Serializer {
+        serializer.serialize_str(match self {
+            ObjRelocKind::Absolute => "abs",
+            ObjRelocKind::PpcAddr16Hi => "hi",
+            ObjRelocKind::PpcAddr16Ha => "ha",
+            ObjRelocKind::PpcAddr16Lo => "l",
+            ObjRelocKind::PpcRel24 => "rel24",
+            ObjRelocKind::PpcRel14 => "rel14",
+            ObjRelocKind::PpcEmbSda21 => "sda21",
+        })
+    }
+}
+
+impl<'de> Deserialize<'de> for ObjRelocKind {
+    fn deserialize<D>(deserializer: D) -> Result<ObjRelocKind, D::Error>
+    where D: serde::Deserializer<'de> {
+        match String::deserialize(deserializer)?.as_str() {
+            "Absolute" | "abs" => Ok(ObjRelocKind::Absolute),
+            "PpcAddr16Hi" | "hi" => Ok(ObjRelocKind::PpcAddr16Hi),
+            "PpcAddr16Ha" | "ha" => Ok(ObjRelocKind::PpcAddr16Ha),
+            "PpcAddr16Lo" | "l" => Ok(ObjRelocKind::PpcAddr16Lo),
+            "PpcRel24" | "rel24" => Ok(ObjRelocKind::PpcRel24),
+            "PpcRel14" | "rel14" => Ok(ObjRelocKind::PpcRel14),
+            "PpcEmbSda21" | "sda21" => Ok(ObjRelocKind::PpcEmbSda21),
+            s => Err(serde::de::Error::unknown_variant(s, &[
+                "abs", "hi", "ha", "l", "rel24", "rel14", "sda21",
+            ])),
+        }
+    }
+}
+
 #[derive(Debug, Clone)]
 pub struct ObjReloc {
     pub kind: ObjRelocKind,

src/obj/symbols.rs

@@ -49,6 +49,8 @@ flags! {
         Stripped,
         /// Disable automatic export of symbol
         NoExport,
+        /// Symbol does not contain any relocations
+        NoReloc,
     }
 }
 
@@ -99,6 +101,9 @@ impl ObjSymbolFlagSet {
     #[inline]
     pub fn is_no_export(&self) -> bool { self.0.contains(ObjSymbolFlags::NoExport) }
 
+    #[inline]
+    pub fn is_no_reloc(&self) -> bool { self.0.contains(ObjSymbolFlags::NoReloc) }
+
     #[inline]
     pub fn set_scope(&mut self, scope: ObjSymbolScope) {
         match scope {
@@ -137,7 +142,8 @@ impl ObjSymbolFlagSet {
                 | ObjSymbolFlags::NoWrite
                 | ObjSymbolFlags::RelocationIgnore
                 | ObjSymbolFlags::Stripped
-                | ObjSymbolFlags::NoExport)
+                | ObjSymbolFlags::NoExport
+                | ObjSymbolFlags::NoReloc)
     }
 }
 

src/util/config.rs

@@ -26,9 +26,9 @@ use crate::{
     },
 };
 
-fn parse_hex(s: &str) -> Result<u32, ParseIntError> {
+pub fn parse_u32(s: &str) -> Result<u32, ParseIntError> {
-    if s.starts_with("0x") {
+    if let Some(s) = s.strip_prefix("0x").or_else(|| s.strip_prefix("0X")) {
-        u32::from_str_radix(s.trim_start_matches("0x"), 16)
+        u32::from_str_radix(s, 16)
     } else {
         s.parse::<u32>()
     }
@@ -65,7 +65,7 @@ pub fn parse_symbol_line(line: &str, obj: &mut ObjInfo) -> Result<Option<ObjSymb
 
     if let Some(captures) = SYMBOL_LINE.captures(line) {
         let name = captures["name"].to_string();
-        let addr = parse_hex(&captures["addr"])?;
+        let addr = parse_u32(&captures["addr"])?;
         let section_name = captures["section"].to_string();
         let section = if section_name == "ABS" {
             None
@@ -96,7 +96,7 @@ pub fn parse_symbol_line(line: &str, obj: &mut ObjInfo) -> Result<Option<ObjSymb
                             .ok_or_else(|| anyhow!("Unknown symbol type '{}'", value))?;
                     }
                     "size" => {
-                        symbol.size = parse_hex(value)? as u64;
+                        symbol.size = parse_u32(value)? as u64;
                         symbol.size_known = true;
                     }
                     "scope" => {
@@ -104,21 +104,21 @@ pub fn parse_symbol_line(line: &str, obj: &mut ObjInfo) -> Result<Option<ObjSymb
                             .ok_or_else(|| anyhow!("Unknown symbol scope '{}'", value))?;
                     }
                     "align" => {
-                        symbol.align = Some(parse_hex(value)?);
+                        symbol.align = Some(parse_u32(value)?);
                     }
                     "data" => {
                         symbol.data_kind = symbol_data_kind_from_str(value)
                             .ok_or_else(|| anyhow!("Unknown symbol data type '{}'", value))?;
                     }
                     "hash" => {
-                        let hash = parse_hex(value)?;
+                        let hash = parse_u32(value)?;
                         symbol.name_hash = Some(hash);
                         if symbol.demangled_name_hash.is_none() {
                             symbol.demangled_name_hash = Some(hash);
                         }
                     }
                     "dhash" => {
-                        symbol.demangled_name_hash = Some(parse_hex(value)?);
+                        symbol.demangled_name_hash = Some(parse_u32(value)?);
                     }
                     _ => bail!("Unknown symbol attribute '{name}'"),
                 }
@@ -145,7 +145,8 @@ pub fn parse_symbol_line(line: &str, obj: &mut ObjInfo) -> Result<Option<ObjSymb
                             symbol.name
                         );
                         let addr = SectionAddress::new(section.unwrap(), symbol.address as u32);
-                        obj.blocked_ranges.insert(addr, addr.address + symbol.size as u32);
+                        obj.blocked_relocation_sources.insert(addr, addr + symbol.size as u32);
+                        symbol.flags.0 |= ObjSymbolFlags::NoReloc;
                     }
                     "noexport" => {
                         symbol.flags.0 |= ObjSymbolFlags::NoExport;
@@ -285,11 +286,9 @@ where W: Write + ?Sized {
     if symbol.flags.is_stripped() {
         write!(w, " stripped")?;
     }
-    if let Some(section) = symbol.section {
+    if symbol.flags.is_no_reloc() {
-        if obj.blocked_ranges.contains_key(&SectionAddress::new(section, symbol.address as u32)) {
         write!(w, " noreloc")?;
     }
-    }
     if symbol.flags.is_no_export() {
         write!(w, " noexport")?;
     }
@@ -547,7 +546,7 @@ fn parse_section_line(captures: Captures, state: &SplitState) -> Result<SplitLin
                         );
                     }
                     "align" => {
-                        section.align = Some(parse_hex(value)?);
+                        section.align = Some(parse_u32(value)?);
                     }
                     _ => bail!("Unknown section attribute '{attr}'"),
                 }
@@ -574,9 +573,9 @@ fn parse_section_line(captures: Captures, state: &SplitState) -> Result<SplitLin
     for attr in captures["attrs"].split(' ').filter(|&s| !s.is_empty()) {
         if let Some((attr, value)) = attr.split_once(':') {
             match attr {
-                "start" => start = Some(parse_hex(value)?),
+                "start" => start = Some(parse_u32(value)?),
-                "end" => end = Some(parse_hex(value)?),
+                "end" => end = Some(parse_u32(value)?),
-                "align" => section.align = Some(parse_hex(value)?),
+                "align" => section.align = Some(parse_u32(value)?),
                 "rename" => section.rename = Some(value.to_string()),
                 _ => bail!("Unknown split attribute '{attr}'"),
             }
@@ -758,3 +757,131 @@ where P: AsRef<Path> {
         Ok(Some(sections))
     }
 }
+
+pub mod signed_hex_serde {
+    use serde::{Deserializer, Serializer};
+
+    pub fn serialize<S>(value: &i64, serializer: S) -> Result<S::Ok, S::Error>
+    where S: Serializer {
+        if *value < 0 {
+            serializer.serialize_str(&format!("-{:#X}", -value))
+        } else {
+            serializer.serialize_str(&format!("{:#X}", value))
+        }
+    }
+
+    pub fn deserialize<'de, D>(deserializer: D) -> Result<i64, D::Error>
+    where D: Deserializer<'de> {
+        struct SignedHexVisitor;
+
+        impl<'de> serde::de::Visitor<'de> for SignedHexVisitor {
+            type Value = i64;
+
+            fn expecting(&self, formatter: &mut std::fmt::Formatter) -> std::fmt::Result {
+                formatter.write_str("a signed hexadecimal number")
+            }
+
+            fn visit_i64<E>(self, v: i64) -> Result<Self::Value, E>
+            where E: serde::de::Error {
+                Ok(v)
+            }
+
+            fn visit_u64<E>(self, v: u64) -> Result<Self::Value, E>
+            where E: serde::de::Error {
+                v.try_into().map_err(serde::de::Error::custom)
+            }
+
+            fn visit_str<E>(self, value: &str) -> Result<i64, E>
+            where E: serde::de::Error {
+                if let Some(s) = value.strip_prefix("-0x").or_else(|| value.strip_prefix("-0X")) {
+                    i64::from_str_radix(s, 16).map(|v| -v).map_err(serde::de::Error::custom)
+                } else if let Some(s) =
+                    value.strip_prefix("0x").or_else(|| value.strip_prefix("0X"))
+                {
+                    i64::from_str_radix(s, 16).map_err(serde::de::Error::custom)
+                } else {
+                    value.parse::<i64>().map_err(serde::de::Error::custom)
+                }
+            }
+        }
+
+        deserializer.deserialize_any(SignedHexVisitor)
+    }
+}
+
+/// A reference to a section and address within that section.
+/// For executable objects, section can be omitted and the address is treated as absolute.
+#[derive(Debug, Clone, PartialEq, Eq, Hash)]
+pub struct SectionAddressRef {
+    pub section: Option<String>,
+    pub address: u32,
+}
+
+impl SectionAddressRef {
+    pub fn new(section: Option<String>, address: u32) -> Self { Self { section, address } }
+
+    pub fn resolve(&self, obj: &ObjInfo) -> Result<SectionAddress> {
+        let (section_index, section) = if let Some(section) = &self.section {
+            obj.sections
+                .by_name(section)?
+                .ok_or_else(|| anyhow!("Section {} not found", section))?
+        } else if obj.kind == ObjKind::Executable {
+            obj.sections.at_address(self.address)?
+        } else {
+            bail!("Section required for relocatable object address reference: {:#X}", self.address)
+        };
+        ensure!(
+            section.contains(self.address),
+            "Address {:#X} not in section {} ({:#X}..{:#X})",
+            self.address,
+            section.name,
+            section.address,
+            section.address + section.size,
+        );
+        Ok(SectionAddress::new(section_index, self.address))
+    }
+}
+
+impl<'de> serde::Deserialize<'de> for SectionAddressRef {
+    fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
+    where D: serde::Deserializer<'de> {
+        struct SectionAddressRefVisitor;
+
+        impl<'de> serde::de::Visitor<'de> for SectionAddressRefVisitor {
+            type Value = SectionAddressRef;
+
+            fn expecting(&self, formatter: &mut std::fmt::Formatter) -> std::fmt::Result {
+                formatter.write_str("a section address reference")
+            }
+
+            fn visit_u64<E>(self, v: u64) -> Result<Self::Value, E>
+            where E: serde::de::Error {
+                Ok(SectionAddressRef::new(None, v.try_into().map_err(serde::de::Error::custom)?))
+            }
+
+            fn visit_str<E>(self, value: &str) -> Result<Self::Value, E>
+            where E: serde::de::Error {
+                let mut parts = value.splitn(2, ':');
+                let section = parts.next().map(|s| s.to_string());
+                let address = parts.next().ok_or_else(|| {
+                    serde::de::Error::invalid_value(serde::de::Unexpected::Str(value), &self)
+                })?;
+                let address = parse_u32(address).map_err(serde::de::Error::custom)?;
+                Ok(SectionAddressRef::new(section, address))
+            }
+        }
+
+        deserializer.deserialize_any(SectionAddressRefVisitor)
+    }
+}
+
+impl serde::Serialize for SectionAddressRef {
+    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
+    where S: serde::Serializer {
+        if let Some(section) = &self.section {
+            serializer.serialize_str(&format!("{}:{:#X}", section, self.address))
+        } else {
+            serializer.serialize_str(&format!("{:#X}", self.address))
+        }
+    }
+}