/
mod.rs
82 lines (69 loc) · 2.36 KB
/
mod.rs
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//! `Register` structs for x86 architectures.
use core::convert::TryInto;
use crate::arch::RawRegId;
use crate::arch::Registers;
mod core32;
mod core64;
pub use core32::X86CoreRegs;
pub use core64::X86_64CoreRegs;
/// 80-bit floating point value
pub type F80 = [u8; 10];
/// FPU registers
#[derive(Debug, Default, Clone)]
pub struct X87FpuInternalRegs {
/// Floating-point control register
pub fctrl: u32,
/// Floating-point status register
pub fstat: u32,
/// Tag word
pub ftag: u32,
/// FPU instruction pointer segment
pub fiseg: u32,
/// FPU intstruction pointer offset
pub fioff: u32,
/// FPU operand segment
pub foseg: u32,
/// FPU operand offset
pub fooff: u32,
/// Floating-point opcode
pub fop: u32,
}
impl Registers for X87FpuInternalRegs {
type RegId = RawRegId;
fn gdb_serialize(&self, mut write_byte: impl FnMut(Option<u8>)) {
macro_rules! write_bytes {
($bytes:expr) => {
for b in $bytes {
write_byte(Some(*b))
}
};
}
// Note: GDB section names don't make sense unless you read x87 FPU section 8.1:
// https://web.archive.org/web/20150123212110/http://www.intel.com/content/dam/www/public/us/en/documents/manuals/64-ia-32-architectures-software-developer-vol-1-manual.pdf
write_bytes!(&self.fctrl.to_le_bytes());
write_bytes!(&self.fstat.to_le_bytes());
write_bytes!(&self.ftag.to_le_bytes());
write_bytes!(&self.fiseg.to_le_bytes());
write_bytes!(&self.fioff.to_le_bytes());
write_bytes!(&self.foseg.to_le_bytes());
write_bytes!(&self.fooff.to_le_bytes());
write_bytes!(&self.fop.to_le_bytes());
}
fn gdb_deserialize(&mut self, bytes: &[u8]) -> Result<(), ()> {
if bytes.len() != 0x20 {
return Err(());
}
let mut regs = bytes
.chunks_exact(4)
.map(|x| u32::from_le_bytes(x.try_into().unwrap()));
self.fctrl = regs.next().ok_or(())?;
self.fstat = regs.next().ok_or(())?;
self.ftag = regs.next().ok_or(())?;
self.fiseg = regs.next().ok_or(())?;
self.fioff = regs.next().ok_or(())?;
self.foseg = regs.next().ok_or(())?;
self.fooff = regs.next().ok_or(())?;
self.fop = regs.next().ok_or(())?;
Ok(())
}
}