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Auto-detect MIPS ABI/category & add config

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Under Diff Options -> Arch Settings, one
can override the ABI/instruction category
This commit is contained in:
Luke Street
2024-05-21 18:06:14 -06:00
parent e254af5acf
commit 9e57a66a05
9 changed files with 188 additions and 34 deletions
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59
objdiff-core/src/arch/mips.rs
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@@ -1,29 +1,56 @@
use std::borrow::Cow;
use std::{borrow::Cow, sync::Mutex};
use anyhow::{anyhow, bail, Result};
use object::{elf, Endian, Endianness, File, Object, Relocation, RelocationFlags};
use object::{elf, Endian, Endianness, File, FileFlags, Object, Relocation, RelocationFlags};
use rabbitizer::{config, Abi, InstrCategory, Instruction, OperandType};
use crate::{
arch::{ObjArch, ProcessCodeResult},
diff::DiffObjConfig,
diff::{DiffObjConfig, MipsAbi, MipsInstrCategory},
obj::{ObjInfo, ObjIns, ObjInsArg, ObjInsArgValue, ObjReloc, ObjSection, SymbolRef},
};
fn configure_rabbitizer() {
static RABBITIZER_MUTEX: Mutex<()> = Mutex::new(());
fn configure_rabbitizer(abi: Abi) {
unsafe {
config::RabbitizerConfig_Cfg.reg_names.fpr_abi_names = Abi::O32;
config::RabbitizerConfig_Cfg.reg_names.fpr_abi_names = abi;
}
}
pub struct ObjArchMips {
pub endianness: Endianness,
pub abi: Abi,
pub instr_category: InstrCategory,
}
const EF_MIPS_ABI: u32 = 0x0000F000;
const EF_MIPS_MACH: u32 = 0x00FF0000;
const E_MIPS_MACH_ALLEGREX: u32 = 0x00840000;
const E_MIPS_MACH_5900: u32 = 0x00920000;
impl ObjArchMips {
pub fn new(object: &File) -> Result<Self> {
configure_rabbitizer();
Ok(Self { endianness: object.endianness() })
let mut abi = Abi::NUMERIC;
let mut instr_category = InstrCategory::CPU;
match object.flags() {
FileFlags::None => {}
FileFlags::Elf { e_flags, .. } => {
abi = match e_flags & EF_MIPS_ABI {
elf::EF_MIPS_ABI_O32 => Abi::O32,
elf::EF_MIPS_ABI_EABI32 | elf::EF_MIPS_ABI_EABI64 => Abi::N32,
_ => Abi::NUMERIC,
};
instr_category = match e_flags & EF_MIPS_MACH {
E_MIPS_MACH_ALLEGREX => InstrCategory::R4000ALLEGREX,
E_MIPS_MACH_5900 => InstrCategory::R5900,
_ => InstrCategory::CPU,
};
}
_ => bail!("Unsupported MIPS file flags"),
}
Ok(Self { endianness: object.endianness(), abi, instr_category })
}
}
@@ -39,6 +66,22 @@ impl ObjArch for ObjArchMips {
let code = &section.data
[symbol.section_address as usize..(symbol.section_address + symbol.size) as usize];
let _guard = RABBITIZER_MUTEX.lock().map_err(|e| anyhow!("Failed to lock mutex: {e}"))?;
configure_rabbitizer(match config.mips_abi {
MipsAbi::Auto => self.abi,
MipsAbi::O32 => Abi::O32,
MipsAbi::N32 => Abi::N32,
MipsAbi::N64 => Abi::N64,
});
let instr_category = match config.mips_instr_category {
MipsInstrCategory::Auto => self.instr_category,
MipsInstrCategory::Cpu => InstrCategory::CPU,
MipsInstrCategory::Rsp => InstrCategory::RSP,
MipsInstrCategory::R3000Gte => InstrCategory::R3000GTE,
MipsInstrCategory::R4000Allegrex => InstrCategory::R4000ALLEGREX,
MipsInstrCategory::R5900 => InstrCategory::R5900,
};
let start_address = symbol.address;
let end_address = symbol.address + symbol.size;
let ins_count = code.len() / 4;
@@ -48,7 +91,7 @@ impl ObjArch for ObjArchMips {
for chunk in code.chunks_exact(4) {
let reloc = section.relocations.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 instruction = Instruction::new(code, cur_addr, instr_category);
let formatted = instruction.disassemble(None, 0);
let op = instruction.unique_id as u16;