encounter/objdiff
1
0
Fork 0
mirror of https://github.com/encounter/objdiff.git synced 2025-12-20 02:15:24 +00:00
Code Issues Packages Projects Releases Wiki Activity

PPC: Guess reloc data type based on the instruction. (#108)

Browse Source 
* Guess reloc data type based on the instruction.

Adds an entry to the reloc tooltip to show the inferred data type
and value.

* Fix clippy warning

* Match on Opcode rather than mnemonic string
This commit is contained in:
Steven Casper
2024-09-26 01:45:37 -04:00
committed by GitHub
parent 35bbd40f5d
commit a43320af1f
5 changed files with 154 additions and 3 deletions
Download Patch File Download Diff File Expand all files Collapse all files

35
objdiff-core/src/arch/ppc.rs
View File

@@ -1,15 +1,16 @@
use std::{borrow::Cow, collections::BTreeMap};
use anyhow::{bail, ensure, Result};
use byteorder::BigEndian;
use cwextab::{decode_extab, ExceptionTableData};
use object::{
elf, File, Object, ObjectSection, ObjectSymbol, Relocation, RelocationFlags, RelocationTarget,
Symbol, SymbolKind,
};
use ppc750cl::{Argument, InsIter, GPR};
use ppc750cl::{Argument, InsIter, Opcode, GPR};
use crate::{
arch::{ObjArch, ProcessCodeResult},
arch::{DataType, ObjArch, ProcessCodeResult},
diff::DiffObjConfig,
obj::{ObjIns, ObjInsArg, ObjInsArgValue, ObjReloc, ObjSection, ObjSymbol},
};
@@ -186,6 +187,36 @@ impl ObjArch for ObjArchPpc {
}
}
fn guess_data_type(&self, instruction: &ObjIns) -> Option<super::DataType> {
// Always shows the first string of the table. Not ideal, but it's really hard to find
// the actual string being referenced.
if instruction.reloc.as_ref().is_some_and(|r| r.target.name.starts_with("@stringBase")) {
return Some(DataType::String);
}
// SAFETY: ppc750cl::Opcode is repr(u8) and op is originally obtained on PPC from casting
// an Opcode to a u8 so we know it's a valid value for Opcode.
match unsafe { std::mem::transmute::<u8, Opcode>(instruction.op as u8) } {
Opcode::Lbz | Opcode::Lbzu | Opcode::Lbzux | Opcode::Lbzx => Some(DataType::Int8),
Opcode::Lhz | Opcode::Lhzu | Opcode::Lhzux | Opcode::Lhzx => Some(DataType::Int16),
Opcode::Lha | Opcode::Lhau | Opcode::Lhaux | Opcode::Lhax => Some(DataType::Int16),
Opcode::Lwz | Opcode::Lwzu | Opcode::Lwzux | Opcode::Lwzx => Some(DataType::Int32),
Opcode::Lfs | Opcode::Lfsu | Opcode::Lfsux | Opcode::Lfsx => Some(DataType::Float),
Opcode::Lfd | Opcode::Lfdu | Opcode::Lfdux | Opcode::Lfdx => Some(DataType::Double),
Opcode::Stb | Opcode::Stbu | Opcode::Stbux | Opcode::Stbx => Some(DataType::Int8),
Opcode::Sth | Opcode::Sthu | Opcode::Sthux | Opcode::Sthx => Some(DataType::Int16),
Opcode::Stw | Opcode::Stwu | Opcode::Stwux | Opcode::Stwx => Some(DataType::Int32),
Opcode::Stfs | Opcode::Stfsu | Opcode::Stfsux | Opcode::Stfsx => Some(DataType::Float),
Opcode::Stfd | Opcode::Stfdu | Opcode::Stfdux | Opcode::Stfdx => Some(DataType::Double),
_ => None,
}
}
fn display_data_type(&self, ty: DataType, bytes: &[u8]) -> Option<String> {
ty.display_bytes::<BigEndian>(bytes)
}
fn ppc(&self) -> Option<&ObjArchPpc> { Some(self) }
}